/* Calculator Monkey - Professional Design System */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* Professional Design System */
:root {
    /* Sophisticated Color Palette */
    --white: #ffffff;
    --gray-25: #fcfcfd;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    
    --primary: #2563eb;
    --primary-50: #eff6ff;
    --primary-100: #dbeafe;
    --primary-500: #3b82f6;
    --primary-600: #2563eb;
    --primary-700: #1d4ed8;
    --primary-900: #1e3a8a;
    
    --accent: #7c3aed;
    --success: #059669;
    --warning: #d97706;
    --error: #dc2626;
    
    /* Typography System */
    --font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'SF Mono', ui-monospace, SFMono-Regular, 'Consolas', monospace;
    
    /* Professional Spacing Scale */
    --space-0: 0;
    --space-px: 1px;
    --space-0-5: 0.125rem;
    --space-1: 0.25rem;
    --space-1-5: 0.375rem;
    --space-2: 0.5rem;
    --space-2-5: 0.625rem;
    --space-3: 0.75rem;
    --space-3-5: 0.875rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-7: 1.75rem;
    --space-8: 2rem;
    --space-9: 2.25rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-14: 3.5rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    --space-32: 8rem;
    
    /* Layout System */
    --container-width: 1200px;
    --border-radius-sm: 6px;
    --border-radius: 8px;
    --border-radius-md: 12px;
    --border-radius-lg: 16px;
    --border-radius-xl: 24px;
    --border-radius-2xl: 32px;
    
    /* Professional Shadow System */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* Smooth Animations */
    --transition-all: all 0.15s ease-out;
    --transition-colors: color 0.15s ease-out, background-color 0.15s ease-out, border-color 0.15s ease-out;
    --transition-shadow: box-shadow 0.15s ease-out;
    --transition-transform: transform 0.15s ease-out;
    
    /* Semantic Color Mappings */
    --primary-color: var(--primary-600);
    --primary-dark: var(--primary-700);
    --primary-light: var(--primary-500);
    --text-primary: var(--gray-900);
    --text-secondary: var(--gray-600);
    --text-muted: var(--gray-500);
    --border-color: var(--gray-300);
    --input-bg: var(--white);
    --input-border: var(--gray-300);
    --card-bg: var(--white);
    --hover-bg: var(--gray-50);
}

/* Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--gray-700);
    background: linear-gradient(180deg, var(--gray-25) 0%, var(--gray-50) 100%);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-feature-settings: 'cv01', 'cv02', 'cv03', 'cv04';
    letter-spacing: -0.011em;
}

/* Container */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--space-6);
}

/* Tight Apple-style Header */
header {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 0.5px solid var(--gray-300);
    padding: var(--space-3) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 1px 0 0 rgba(0, 0, 0, 0.05);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 52px;
}

.logo {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--gray-900);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: var(--space-3);
    transition: var(--transition-colors);
    letter-spacing: -0.025em;
}

.logo:hover {
    color: var(--primary-600);
}

/* Professional Navigation */
nav ul {
    display: flex;
    list-style: none;
    gap: var(--space-6);
    margin: 0;
    align-items: center;
}

nav a {
    color: var(--gray-600);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.875rem;
    transition: var(--transition-colors);
    position: relative;
    padding: var(--space-1-5) var(--space-3);
    border-radius: 6px;
    letter-spacing: -0.01em;
}

nav a:hover {
    color: var(--gray-900);
    background-color: rgba(0, 0, 0, 0.06);
}

nav a[aria-current="page"] {
    color: var(--primary-600);
    background-color: var(--primary-100);
    font-weight: 600;
}

/* Main Content */
main {
    padding-top: var(--space-6);
    padding-bottom: var(--space-16);
    min-height: 100vh;
}

/* Professional Typography System */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-family);
    font-weight: 600;
    line-height: 1.2;
    color: var(--gray-900);
    margin-bottom: var(--space-6);
    letter-spacing: -0.025em;
}

h1 { 
    font-size: 2.25rem; 
    font-weight: 700; 
    line-height: 1.1;
}

h2 { 
    font-size: 1.875rem; 
    font-weight: 600; 
    line-height: 1.15;
}

h3 { 
    font-size: 1.5rem; 
    font-weight: 600; 
    line-height: 1.2;
}

h4 { 
    font-size: 1.25rem; 
    font-weight: 600; 
}

h5 { 
    font-size: 1.125rem; 
    font-weight: 600; 
}

h6 { 
    font-size: 1rem; 
    font-weight: 600; 
}

.page-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--space-3);
    letter-spacing: -0.03em;
    line-height: 1.1;
}

.page-subtitle {
    text-align: center;
    font-size: 1rem;
    color: var(--gray-600);
    margin-bottom: var(--space-8);
    max-width: 560px;
    margin-left: auto;
    margin-right: auto;
    font-weight: 400;
    line-height: 1.5;
    letter-spacing: -0.005em;
}

p {
    margin-bottom: var(--space-4);
    color: var(--gray-600);
    line-height: 1.7;
}

/* Professional Card System */
.card {
    background: var(--white);
    border: 0.5px solid var(--gray-300);
    border-radius: var(--border-radius-md);
    padding: var(--space-6);
    margin: var(--space-4) 0;
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.08);
    transition: var(--transition-all), var(--transition-shadow);
}

.card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--gray-300);
}

/* Search and Filter Section */
.search-filter-section {
    margin-bottom: var(--space-8);
}

.search-container {
    margin-bottom: var(--space-6);
}

.search-box {
    position: relative;
    max-width: 480px;
    margin: 0 auto;
}

.search-input {
    width: 100%;
    padding: var(--space-3) var(--space-12) var(--space-3) var(--space-10);
    font-family: var(--font-family);
    font-size: 0.9375rem;
    color: var(--gray-700);
    background: var(--white);
    border: 1px solid var(--gray-300);
    border-radius: var(--border-radius-md);
    transition: var(--transition-all);
    box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-600);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1), 0 1px 3px 0 rgba(0, 0, 0, 0.1);
}

.search-input::placeholder {
    color: var(--gray-400);
}

.search-icon {
    position: absolute;
    left: var(--space-3);
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray-400);
    pointer-events: none;
}

.search-clear {
    position: absolute;
    right: var(--space-3);
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--gray-400);
    cursor: pointer;
    padding: var(--space-1);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-colors);
}

.search-clear:hover {
    color: var(--gray-600);
    background-color: var(--gray-100);
}

/* Filter Pills */
.filter-pills {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    justify-content: center;
}

.filter-pill {
    padding: var(--space-2) var(--space-4);
    font-family: var(--font-family);
    font-size: 0.875rem;
    font-weight: 500;
    background: var(--gray-100);
    color: var(--gray-600);
    border: none;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    transition: var(--transition-all);
    white-space: nowrap;
}

.filter-pill:hover {
    background: var(--gray-200);
    color: var(--gray-700);
}

.filter-pill.active {
    background: var(--primary-600);
    color: var(--white);
}

.filter-pill.active:hover {
    background: var(--primary-700);
}

/* Results Info */
.results-info {
    text-align: center;
    margin-bottom: var(--space-6);
}

.results-info span {
    font-size: 0.875rem;
    color: var(--gray-500);
    font-weight: 500;
}

/* Calculator Grid and Cards */
.calculators-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--space-6);
    margin-bottom: var(--space-8);
}

.calculator-item {
    transition: var(--transition-all);
}

.calculator-card {
    background: var(--white);
    border: 0.5px solid var(--gray-300);
    border-radius: var(--border-radius-md);
    padding: var(--space-6);
    height: 100%;
    display: flex;
    flex-direction: column;
    transition: var(--transition-all);
    position: relative;
    overflow: hidden;
}

.calculator-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--primary-50) 0%, var(--primary-100) 100%);
    opacity: 0;
    transition: opacity 0.2s ease-out;
    z-index: 0;
}

.calculator-card:hover::before {
    opacity: 1;
}

.calculator-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px 0 rgba(0, 0, 0, 0.1);
    border-color: var(--primary-200);
}

.calculator-card > * {
    position: relative;
    z-index: 1;
}

.calculator-icon {
    font-size: 2.5rem;
    margin-bottom: var(--space-4);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    background: var(--gray-50);
    border-radius: var(--border-radius);
    border: 0.5px solid var(--gray-200);
}

.calculator-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--space-2);
    letter-spacing: -0.01em;
}

.calculator-description {
    font-size: 0.875rem;
    color: var(--gray-600);
    line-height: 1.5;
    margin-bottom: var(--space-4);
    flex-grow: 1;
}

.calculator-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-bottom: var(--space-4);
}

.tag {
    padding: var(--space-1) var(--space-2-5);
    font-size: 0.75rem;
    font-weight: 500;
    background: var(--gray-100);
    color: var(--gray-600);
    border-radius: var(--border-radius-sm);
    border: 0.5px solid var(--gray-200);
}

.calculator-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-2-5) var(--space-4);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary-600);
    background: var(--primary-50);
    border: 1px solid var(--primary-200);
    border-radius: var(--border-radius);
    text-decoration: none;
    transition: var(--transition-all);
    margin-top: auto;
}

.calculator-link:hover {
    color: var(--white);
    background: var(--primary-600);
    border-color: var(--primary-600);
}

.calculator-link.coming-soon {
    color: var(--gray-500);
    background: var(--gray-100);
    border-color: var(--gray-200);
    cursor: not-allowed;
    pointer-events: none;
}

/* No Results */
.no-results {
    text-align: center;
    padding: var(--space-16) var(--space-8);
}

.no-results-content {
    max-width: 400px;
    margin: 0 auto;
}

.no-results-icon {
    font-size: 4rem;
    margin-bottom: var(--space-4);
    opacity: 0.5;
}

.no-results h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--space-3);
}

.no-results p {
    color: var(--gray-600);
    margin-bottom: var(--space-6);
}

.category-card {
    background: var(--white);
    border: 0.5px solid var(--gray-300);
    border-radius: var(--border-radius);
    padding: var(--space-6) var(--space-5);
    transition: var(--transition-all), var(--transition-shadow);
    cursor: pointer;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 140px;
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.category-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--primary-50) 0%, var(--primary-100) 100%);
    opacity: 0;
    transition: opacity 0.2s ease-out;
    z-index: 0;
}

.category-card:hover::before {
    opacity: 1;
}

.category-card:hover {
    box-shadow: 0 4px 12px 0 rgba(0, 0, 0, 0.15);
    border-color: var(--primary-300);
    transform: translateY(-1px);
}

.category-card > * {
    position: relative;
    z-index: 1;
}

.category-icon {
    font-size: 2.25rem;
    margin-bottom: var(--space-3);
    display: block;
    transition: var(--transition-transform);
    opacity: 0.9;
}

.category-card:hover .category-icon {
    transform: scale(1.03);
    opacity: 1;
}

.category-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--space-1);
    letter-spacing: -0.01em;
    text-align: center;
}

.category-count {
    font-size: 0.75rem;
    color: var(--gray-500);
    margin: 0;
    font-weight: 500;
    text-align: center;
}

/* Professional Button System */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-family: var(--font-family);
    font-size: 0.9375rem;
    font-weight: 500;
    text-decoration: none;
    border: 1px solid transparent;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition-all);
    background: var(--primary-600);
    color: var(--white);
    letter-spacing: -0.01em;
    min-height: 40px;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, transparent 0%, rgba(255, 255, 255, 0.1) 50%, transparent 100%);
    transform: translateX(-100%);
    transition: transform 0.6s ease-out;
}

.btn:hover::before {
    transform: translateX(100%);
}

.btn:hover {
    background: var(--primary-700);
    box-shadow: var(--shadow-lg);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--gray-600);
}

.btn-secondary:hover {
    background: var(--gray-500);
}

.btn-success {
    background: var(--success-green);
}

.btn-success:hover {
    background: #059669;
}

.btn-outline {
    background: transparent;
    color: var(--gray-700);
    border: 1px solid var(--gray-300);
}

.btn-outline:hover {
    background: var(--white);
    border-color: var(--primary-blue);
    color: var(--primary-blue);
    box-shadow: var(--shadow-md);
}

/* Grid System - Simple & Responsive */
.grid {
    display: grid;
    gap: var(--space-6);
    margin: var(--space-6) 0;
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.grid-5 {
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

/* Forms - Clean & Functional */
.form-group {
    margin-bottom: var(--space-2);
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: var(--space-2);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: var(--space-3);
    font-family: var(--font-family);
    font-size: 0.875rem;
    color: var(--gray-700);
    background: var(--white);
    border: 1px solid var(--gray-300);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 4px rgba(0, 122, 255, 0.15);
}

.form-textarea {
    min-height: 120px;
    resize: vertical;
}

/* Alerts - Subtle & Clear */
.alert {
    padding: var(--space-4);
    border-radius: var(--border-radius);
    margin: var(--space-4) 0;
    font-weight: 500;
}

.alert-info {
    background: #eff6ff;
    color: #1e40af;
    border: 1px solid #bfdbfe;
}

.alert-success {
    background: #f0fdf4;
    color: #166534;
    border: 1px solid #bbf7d0;
}

.alert-warning {
    background: #fffbeb;
    color: #92400e;
    border: 1px solid #fde68a;
}

.alert-error {
    background: #fef2f2;
    color: #dc2626;
    border: 1px solid #fecaca;
}

/* Footer - Clean & Organized */
footer {
    background: var(--gray-50);
    border-top: 1px solid var(--gray-200);
    padding: var(--space-16) 0 var(--space-8);
    margin-top: var(--space-24);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-8);
    margin-bottom: var(--space-8);
}

.footer-section h3 {
    color: var(--gray-900);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--space-4);
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: var(--space-2);
}

.footer-section a {
    color: var(--gray-600);
    text-decoration: none;
    font-size: 0.875rem;
    transition: var(--transition);
}

.footer-section a:hover {
    color: var(--primary-blue);
}

.footer-section p {
    color: var(--gray-500);
    font-size: 0.875rem;
    line-height: 1.6;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--space-6);
    border-top: 1px solid var(--gray-200);
    font-size: 0.875rem;
    color: var(--gray-500);
}

.footer-bottom a {
    color: var(--gray-600);
    text-decoration: none;
}

.footer-bottom a:hover {
    color: var(--primary-blue);
}

/* About Page Specific Styles */
.feature-card {
    text-align: center;
    padding: var(--space-6);
    background: var(--white);
    border: 0.5px solid var(--gray-200);
    border-radius: var(--border-radius-md);
    transition: var(--transition-all);
}

.feature-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-200);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: var(--space-4);
    display: block;
}

.feature-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--space-2);
}

.feature-card p {
    font-size: 0.875rem;
    color: var(--gray-600);
    line-height: 1.6;
    margin: 0;
}

.commitment-grid {
    display: grid;
    gap: var(--space-6);
    margin-top: var(--space-6);
}

.commitment-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-4);
}

.commitment-icon {
    font-size: 2rem;
    flex-shrink: 0;
    margin-top: var(--space-1);
}

.commitment-content h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--space-1);
}

.commitment-content p {
    font-size: 0.875rem;
    color: var(--gray-600);
    line-height: 1.6;
    margin: 0;
}

/* Enhanced About Page Styles */
.value-card {
    text-align: center;
    padding: var(--space-6);
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius-lg);
    transition: var(--transition-all);
    position: relative;
    overflow: hidden;
}

.value-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--primary-50) 0%, var(--primary-100) 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 0;
}

.value-card:hover::before {
    opacity: 1;
}

.value-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-200);
}

.value-card > * {
    position: relative;
    z-index: 1;
}

.value-icon {
    font-size: 3rem;
    margin-bottom: var(--space-4);
    display: block;
    transition: var(--transition-transform);
}

.value-card:hover .value-icon {
    transform: scale(1.1);
}

.value-card h4 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--space-3);
    letter-spacing: -0.01em;
}

.value-card p {
    font-size: 0.9375rem;
    color: var(--gray-600);
    line-height: 1.6;
    margin: 0;
}

/* Calculator Page Styles */
.calculator-header {
    text-align: center;
    margin-bottom: var(--space-8);
}

.calculator-icon-large {
    font-size: 4rem;
    margin-bottom: var(--space-4);
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

.calculator-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
    align-items: start;
}

@media (max-width: 768px) {
    .calculator-layout {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }
}

.calculator-input, .calculator-results {
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}

.calculator-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}

/* Unit Toggle */
.unit-toggle {
    display: flex;
    background: var(--gray-100);
    border-radius: var(--border-radius);
    padding: var(--space-1);
    gap: var(--space-1);
}

.unit-btn {
    flex: 1;
    padding: var(--space-2) var(--space-4);
    background: transparent;
    border: none;
    border-radius: calc(var(--border-radius) - var(--space-1));
    font-family: var(--font-family);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-600);
    cursor: pointer;
    transition: var(--transition-all);
}

.unit-btn.active {
    background: var(--white);
    color: var(--primary-600);
    box-shadow: var(--shadow-sm);
}

.unit-btn:hover {
    color: var(--primary-600);
}

/* Imperial Height Inputs */
.height-imperial-inputs {
    display: flex;
    gap: var(--space-3);
}

.height-input-group {
    flex: 1;
    position: relative;
}

.height-input-group .form-input {
    padding-right: var(--space-8);
}

.input-suffix {
    position: absolute;
    right: var(--space-3);
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-500);
    pointer-events: none;
}

/* Imperial Weight Inputs */
.weight-imperial-inputs {
    display: flex;
    gap: var(--space-3);
}

.weight-input-group {
    flex: 1;
    position: relative;
}

.weight-input-group .form-input {
    padding-right: var(--space-8);
}

/* Large Calculator Buttons */
.btn-large {
    width: 100%;
    padding: var(--space-4) var(--space-6);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--space-2);
    min-height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-large:last-child {
    margin-bottom: 0;
}

.button-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
    margin-top: var(--space-2);
}

.button-group .btn-large {
    margin-bottom: 0;
    padding: var(--space-2) var(--space-4);
    min-height: 36px;
    font-size: 0.875rem;
}

.button-group .btn-large:last-child {
    margin-bottom: 0;
}

/* Form Enhancements */
.input-help {
    display: block;
    margin-top: var(--space-1);
    font-size: 0.8125rem;
    color: var(--gray-500);
    line-height: 1.4;
}

.btn-calculate {
    background: var(--primary-600);
    color: var(--white);
    padding: var(--space-3) var(--space-6);
    font-weight: 600;
    position: relative;
    overflow: hidden;
}

.btn-calculate::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, transparent 0%, rgba(255, 255, 255, 0.2) 50%, transparent 100%);
    transform: translateX(-100%);
    transition: transform 0.6s ease;
}

.btn-calculate:hover::before {
    transform: translateX(100%);
}

/* BMI Results */
.bmi-result {
    text-align: center;
    padding: var(--space-6) 0;
    background: linear-gradient(135deg, var(--primary-50) 0%, var(--primary-100) 100%);
    border-radius: var(--border-radius-lg);
    margin-bottom: var(--space-6);
}

.bmi-score {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
}

.bmi-value {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--primary-600);
    line-height: 1;
    letter-spacing: -0.02em;
}

.bmi-label {
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-600);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.bmi-category {
    margin-bottom: var(--space-6);
}

.category-indicator {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-4);
    border-radius: var(--border-radius-lg);
    border: 2px solid;
    transition: var(--transition-all);
}

.category-indicator.underweight {
    background: #fef3c7;
    border-color: #d97706;
    color: #92400e;
}

.category-indicator.normal {
    background: #d1fae5;
    border-color: #059669;
    color: #065f46;
}

.category-indicator.overweight {
    background: #fed7d7;
    border-color: #e53e3e;
    color: #c53030;
}

.category-indicator.obese {
    background: #fecaca;
    border-color: #dc2626;
    color: #991b1b;
}

.category-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.category-text h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-1);
}

.category-text p {
    font-size: 0.9375rem;
    margin: 0;
    opacity: 0.9;
}

.bmi-recommendations h4 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--space-3);
}

.bmi-recommendations ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.bmi-recommendations li {
    padding: var(--space-2) 0;
    padding-left: var(--space-6);
    position: relative;
    font-size: 0.9375rem;
    color: var(--gray-700);
    line-height: 1.5;
}

.bmi-recommendations li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success);
    font-weight: 600;
}

/* BMI Chart */
.bmi-chart {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.bmi-range {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-3) var(--space-4);
    border-radius: var(--border-radius);
    border-left: 4px solid;
    transition: var(--transition-all);
}

.bmi-range:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-sm);
}

.bmi-range.underweight {
    background: #fef3c7;
    border-color: #d97706;
}

.bmi-range.normal {
    background: #d1fae5;
    border-color: #059669;
}

.bmi-range.overweight {
    background: #fed7d7;
    border-color: #e53e3e;
}

.bmi-range.obese {
    background: #fecaca;
    border-color: #dc2626;
}

.range-value {
    font-weight: 600;
    font-family: var(--font-mono);
    color: var(--gray-900);
}

.range-label {
    font-weight: 500;
    color: var(--gray-700);
}

.calculator-info {
    margin-top: var(--space-8);
}

.calculator-info h4 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--space-2);
}

.calculator-info p {
    font-size: 0.9375rem;
    color: var(--gray-700);
    line-height: 1.6;
    margin-bottom: var(--space-3);
}

.calculator-info ul {
    margin: 0;
    padding-left: 1.5rem;
}

.calculator-info li {
    font-size: 0.9375rem;
    color: var(--gray-700);
    line-height: 1.6;
    margin-bottom: var(--space-1);
}

/* Contact Page Styles */
.contact-form {
    max-width: 600px;
    margin: 0 auto;
}

.contact-info {
    text-align: center;
    margin-bottom: var(--space-8);
}

.contact-methods {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-6);
    margin-bottom: var(--space-8);
}

.contact-method {
    text-align: center;
    padding: var(--space-6);
    background: var(--white);
    border: 0.5px solid var(--gray-200);
    border-radius: var(--border-radius-md);
    transition: var(--transition-all);
}

.contact-method:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-200);
}

.contact-method-icon {
    font-size: 2.5rem;
    margin-bottom: var(--space-3);
    display: block;
}

.contact-method h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: var(--space-2);
}

.contact-method p {
    font-size: 0.875rem;
    color: var(--gray-600);
    line-height: 1.6;
    margin: 0;
}

/* 404 Page Styles */
.error-page {
    text-align: center;
    padding: var(--space-16) 0;
}

.error-icon {
    font-size: 6rem;
    margin-bottom: var(--space-6);
    opacity: 0.7;
}

.error-title {
    font-size: 3rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--space-4);
    letter-spacing: -0.03em;
}

.error-subtitle {
    font-size: 1.25rem;
    color: var(--gray-600);
    margin-bottom: var(--space-8);
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.error-actions {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-4);
}

.error-actions .btn {
    min-width: 200px;
}

@media (min-width: 768px) {
    .error-actions {
        flex-direction: row;
        justify-content: center;
    }
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.font-light { font-weight: 300; }
.font-normal { font-weight: 400; }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }

.text-gray-500 { color: var(--gray-500); }
.text-gray-600 { color: var(--gray-600); }
.text-gray-700 { color: var(--gray-700); }
.text-gray-900 { color: var(--gray-900); }

.bg-gray-50 { background-color: var(--gray-50); }
.bg-white { background-color: var(--white); }

.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }

.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }

.hidden { display: none; }
.block { display: block; }
.flex { display: flex; }
.inline-flex { display: inline-flex; }

/* Special Components */
.hero-section {
    text-align: center;
    padding: var(--space-12) 0 var(--space-8) 0;
    background: var(--white);
}

.brand-section {
    text-align: center;
    padding: var(--space-12) 0 var(--space-10) 0;
    background: linear-gradient(135deg, var(--white) 0%, var(--gray-50) 50%, var(--white) 100%);
    margin-bottom: var(--space-12);
    border-radius: var(--border-radius-xl);
    border: 0.5px solid var(--gray-300);
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.08);
    position: relative;
    overflow: hidden;
}

.brand-section::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, var(--primary-50) 0%, transparent 70%);
    opacity: 0.4;
    animation: rotate 20s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.brand-section > * {
    position: relative;
    z-index: 1;
}

.brand-logo {
    font-size: 2.5rem;
    margin-bottom: var(--space-4);
    filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.15));
}

.total-count {
    font-size: 1.125rem;
    color: var(--gray-600);
    margin-bottom: var(--space-6);
    font-weight: 400;
    max-width: 420px;
    margin-left: auto;
    margin-right: auto;
}

.total-count strong {
    color: var(--primary-600);
    font-weight: 700;
}

.feature-grid .card {
    text-align: center;
    padding: var(--space-6);
}

.feature-grid .card h3 {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
    color: var(--gray-900);
}

.feature-grid .card .emoji {
    font-size: 2rem;
    padding: var(--space-3);
    background: var(--gray-100);
    border-radius: var(--border-radius);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--space-8);
    text-align: center;
    margin: var(--space-12) 0;
}

.stat-item {
    padding: var(--space-4);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary-blue);
    margin-bottom: var(--space-2);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--gray-600);
    font-weight: 500;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--space-4);
    }
    
    .top-banner-content {
        padding: 0 var(--space-4);
    }
    
    .header-content {
        flex-direction: column;
        gap: var(--space-4);
    }
    
    nav ul {
        gap: var(--space-6);
    }
    
    .page-title {
        font-size: 2.5rem;
    }
    
    .page-subtitle {
        font-size: 1.125rem;
    }
    
    .grid-2,
    .grid-3,
    .grid-4,
    .grid-5 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .card {
        padding: var(--space-6);
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .stats-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--space-4);
    }
    
    .stat-number {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-3);
    }
    
    .page-title {
        font-size: 2rem;
    }
    
    .grid-2,
    .grid-3,
    .grid-4,
    .grid-5 {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }
    
    .category-card {
        min-height: 120px;
        padding: var(--space-5);
    }
    
    .category-icon {
        font-size: 2rem;
    }
    
    .brand-logo {
        font-size: 2.25rem;
    }
    
    .page-title {
        font-size: 2rem;
    }
}

/* Calorie Deficit Calculator Styles */
.calorie-breakdown {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    margin: var(--space-6) 0;
}

.calorie-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-3) var(--space-4);
    background: var(--gray-50);
    border-radius: var(--border-radius);
    border: 1px solid var(--gray-200);
}

.calorie-item.main-result {
    background: linear-gradient(135deg, var(--primary-50) 0%, var(--primary-100) 100%);
    border: 1px solid var(--primary-200);
    font-weight: 600;
}

.calorie-item.deficit {
    background: linear-gradient(135deg, var(--warning-50, #fef3c7) 0%, var(--warning-100, #fde68a) 100%);
    border: 1px solid var(--warning-200, #fbbf24);
}

.calorie-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-600);
}

.calorie-value {
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-800);
}

.calorie-value.large {
    font-size: 1.25rem;
    color: var(--primary-600);
}

.timeline-projection {
    margin-top: var(--space-6);
    padding-top: var(--space-6);
    border-top: 1px solid var(--gray-200);
}

.timeline-projection h3 {
    margin-bottom: var(--space-4);
    color: var(--gray-800);
    font-size: 1.125rem;
    font-weight: 600;
}

.timeline-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: var(--space-4);
}

.timeline-item {
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--border-radius);
    padding: var(--space-4);
    text-align: center;
    transition: var(--transition-all);
}

.timeline-item:hover {
    background: var(--white);
    box-shadow: var(--shadow-sm);
    transform: translateY(-1px);
}

.timeline-period {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gray-600);
    margin-bottom: var(--space-2);
}

.timeline-loss {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--primary-600);
    margin-bottom: var(--space-1);
}

.timeline-loss-lbs {
    font-size: 0.75rem;
    color: var(--gray-500);
}

.recommendations {
    margin-top: var(--space-6);
    padding-top: var(--space-6);
    border-top: 1px solid var(--gray-200);
}

.recommendations h3 {
    margin-bottom: var(--space-4);
    color: var(--gray-800);
    font-size: 1.125rem;
    font-weight: 600;
}

.recommendation-cards {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.recommendation-card {
    padding: var(--space-4);
    border-radius: var(--border-radius);
    border-left: 4px solid;
}

.recommendation-card h4 {
    margin: 0 0 var(--space-2) 0;
    font-size: 0.875rem;
    font-weight: 600;
}

.recommendation-card p {
    margin: 0;
    font-size: 0.875rem;
    line-height: 1.5;
}

.recommendation-card.success {
    background: var(--success-50, #ecfdf5);
    border-left-color: var(--success-500, #10b981);
    color: var(--success-800, #065f46);
}

.recommendation-card.info {
    background: var(--primary-50);
    border-left-color: var(--primary-500);
    color: var(--primary-800, #1e40af);
}

.recommendation-card.warning {
    background: var(--warning-50, #fffbeb);
    border-left-color: var(--warning-500, #f59e0b);
    color: var(--warning-800, #92400e);
}

.recommendation-card.error {
    background: var(--error-50, #fef2f2);
    border-left-color: var(--error-500, #ef4444);
    color: var(--error-800, #991b1b);
}

.gender-toggle {
    display: flex;
    background: var(--gray-100);
    border-radius: var(--border-radius);
    padding: var(--space-1);
    gap: var(--space-1);
}

.gender-btn {
    flex: 1;
    padding: var(--space-2) var(--space-4);
    background: transparent;
    border: none;
    border-radius: var(--border-radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-600);
    cursor: pointer;
    transition: var(--transition-all);
}

.gender-btn.active {
    background: var(--white);
    color: var(--primary-600);
    box-shadow: var(--shadow-sm);
}

.gender-btn:hover:not(.active) {
    color: var(--gray-800);
}

/* Responsive adjustments for calorie calculator */
@media (max-width: 768px) {
    .timeline-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-3);
    }
    
    .timeline-item {
        padding: var(--space-3);
    }
    
    .timeline-loss {
        font-size: 1rem;
    }
    
    .calorie-item {
        padding: var(--space-3);
    }
    
    .calorie-value.large {
        font-size: 1.125rem;
    }
}

/* Converter Tool Styles */
.converter-input-group {
    display: flex;
    gap: var(--space-2);
    align-items: stretch;
}

.converter-value {
    flex: 1;
}

.converter-unit {
    flex: 1;
    min-width: 150px;
}

.conversion-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-3);
}

.conversion-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-2) var(--space-3);
    background: var(--gray-50);
    border-radius: var(--border-radius);
    border: 1px solid var(--gray-200);
}

.conversion-label {
    font-size: 0.875rem;
    color: var(--gray-600);
    font-weight: 500;
}

.conversion-value {
    font-size: 0.875rem;
    color: var(--gray-800);
    font-weight: 600;
}

/* Responsive adjustments for converters */
@media (max-width: 768px) {
    .converter-input-group {
        flex-direction: column;
    }
    
    .converter-unit {
        min-width: unset;
    }
    
    .conversion-grid {
        grid-template-columns: 1fr;
        gap: var(--space-2);
    }
    
    .conversion-item {
        padding: var(--space-2);
    }
}

/* Age Calculator Styles */
.age-display {
    text-align: center;
    margin: var(--space-6) 0;
    padding: var(--space-6);
    background: linear-gradient(135deg, var(--primary-50) 0%, var(--primary-100) 100%);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--primary-200);
}

.age-main {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
}

.age-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-600);
    line-height: 1;
}

.age-unit {
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--gray-600);
}

.age-breakdown {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--space-3);
    margin: var(--space-6) 0;
}

.age-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--space-3);
    background: var(--gray-50);
    border-radius: var(--border-radius);
    border: 1px solid var(--gray-200);
}

.age-label {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.025em;
    margin-bottom: var(--space-1);
}

.age-value {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-800);
}

.age-details {
    margin-top: var(--space-6);
    padding-top: var(--space-6);
    border-top: 1px solid var(--gray-200);
}

.age-details h3 {
    margin-bottom: var(--space-4);
    color: var(--gray-800);
    font-size: 1.125rem;
    font-weight: 600;
}

.detail-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-2) 0;
    border-bottom: 1px solid var(--gray-100);
}

.detail-item:last-child {
    border-bottom: none;
}

.detail-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-600);
}

.detail-value {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gray-800);
    text-align: right;
}

/* Responsive adjustments for age calculator */
@media (max-width: 768px) {
    .age-number {
        font-size: 2.5rem;
    }
    
    .age-breakdown {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-2);
    }
    
    .age-item {
        padding: var(--space-2);
    }
    
    .age-value {
        font-size: 1rem;
    }
    
    .detail-item {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-1);
    }
    
    .detail-value {
        text-align: left;
    }
}

/* Date Calculator Styles */
.date-math-inputs {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.date-input-row {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.date-number-input {
    width: 100px;
    text-align: center;
}

.input-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-600);
    min-width: 60px;
}

.date-result {
    text-align: center;
    margin: var(--space-4) 0;
}

.result-date {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-6);
    background: linear-gradient(135deg, var(--primary-50) 0%, var(--primary-100) 100%);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--primary-200);
    margin-bottom: var(--space-4);
}

.result-value {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-600);
    line-height: 1.2;
}

.result-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-600);
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.result-details {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-2) 0;
    border-bottom: 1px solid var(--gray-100);
}

.result-item:last-child {
    border-bottom: none;
}

.result-item-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-600);
}

.result-item-value {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gray-800);
}

.conversion-item.clickable {
    cursor: pointer;
    transition: var(--transition-all);
}

.conversion-item.clickable:hover {
    background: var(--primary-50);
    border-color: var(--primary-200);
    transform: translateY(-1px);
}

/* Time Zone Converter Styles */
.timezone-result {
    padding: var(--space-4);
}

.time-display {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.time-zone-item {
    text-align: center;
    padding: var(--space-4);
    border-radius: var(--border-radius-lg);
    width: 100%;
    max-width: 300px;
    border: 1px solid transparent;
}

.time-zone-item.from-zone {
    background: linear-gradient(135deg, var(--primary-50) 0%, var(--primary-100) 100%);
    border-color: var(--primary-200);
}

.time-zone-item.to-zone {
    background: linear-gradient(135deg, #f0fdf4 0%, #dcfce7 100%);
    border-color: #bbf7d0;
}

.zone-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gray-600);
    margin-bottom: var(--space-1);
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.zone-time {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--space-1);
    font-family: var(--font-mono);
    line-height: 1.1;
}

.zone-date {
    display: block;
    font-size: 0.9375rem;
    color: var(--gray-600);
    font-weight: 500;
}

.time-arrow {
    font-size: 1.5rem;
    color: var(--primary-600);
    font-weight: 600;
}

.time-details {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.time-detail-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-2) 0;
    border-bottom: 1px solid var(--gray-100);
}

.time-detail-item:last-child {
    border-bottom: none;
}

.detail-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-600);
}

.detail-value {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gray-800);
}

/* World Clock Styles */
.world-clock-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--space-3);
}

.world-clock-item {
    text-align: center;
    padding: var(--space-3);
    background: var(--gray-50);
    border-radius: var(--border-radius);
    border: 1px solid var(--gray-200);
    transition: var(--transition-all);
}

.world-clock-item:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
    background: var(--white);
}

.clock-zone {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--gray-600);
    margin-bottom: var(--space-1);
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.clock-time {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-600);
    margin-bottom: var(--space-1);
    font-family: var(--font-mono);
    line-height: 1.1;
}

.clock-date {
    font-size: 0.75rem;
    color: var(--gray-500);
    font-weight: 500;
}

/* Responsive adjustments for date calculator */
@media (max-width: 768px) {
    .date-input-row {
        flex-direction: column;
        align-items: stretch;
        gap: var(--space-1);
    }
    
    .date-number-input {
        width: 100%;
        text-align: left;
    }
    
    .input-label {
        min-width: unset;
        font-size: 0.75rem;
    }
    
    .result-value {
        font-size: 1.25rem;
    }
    
    .result-item {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-1);
    }

    .world-clock-grid {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
        gap: var(--space-2);
    }
    
    .zone-time {
        font-size: 1.5rem;
    }
    
    .clock-time {
        font-size: 1.125rem;
    }
    
    .time-display {
        gap: var(--space-2);
    }
    
    .time-zone-item {
        padding: var(--space-3);
    }
}

/* Countdown Timer Styles */
.countdown-container {
    padding: var(--space-4);
}

.countdown-main {
    text-align: center;
    margin-bottom: var(--space-4);
}

.countdown-units {
    display: flex;
    justify-content: center;
    gap: var(--space-4);
    margin-bottom: var(--space-4);
    flex-wrap: wrap;
}

.countdown-unit {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--space-3);
    background: linear-gradient(135deg, var(--primary-50) 0%, var(--primary-100) 100%);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--primary-200);
    min-width: 80px;
    flex: 1;
    max-width: 120px;
}

.countdown-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-600);
    font-family: var(--font-mono);
    line-height: 1;
    margin-bottom: var(--space-1);
}

.countdown-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gray-600);
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.countdown-progress {
    margin: var(--space-4) 0;
}

.progress-bar {
    width: 100%;
    height: 12px;
    background: var(--gray-200);
    border-radius: 6px;
    overflow: hidden;
    margin-bottom: var(--space-2);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-500) 0%, var(--primary-600) 100%);
    border-radius: 6px;
    transition: width 0.3s ease;
    width: 0%;
}

.progress-text {
    text-align: center;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--gray-600);
}

.countdown-details {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.countdown-detail {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-2) 0;
    border-bottom: 1px solid var(--gray-100);
}

.countdown-detail:last-child {
    border-bottom: none;
}

.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    margin-top: var(--space-2);
}

.checkbox-label {
    display: flex;
    align-items: center;
    font-size: 0.9375rem;
    color: var(--gray-700);
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    margin-right: var(--space-2);
    transform: scale(1.1);
}

/* Responsive countdown timer */
@media (max-width: 768px) {
    .countdown-units {
        gap: var(--space-2);
    }
    
    .countdown-unit {
        min-width: 70px;
        padding: var(--space-2);
    }
    
    .countdown-number {
        font-size: 2rem;
    }
    
    .countdown-label {
        font-size: 0.75rem;
    }
    
    .countdown-detail {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-1);
        text-align: left;
    }
}

/* Text Counter Styles */
.text-counter-textarea {
    min-height: 250px;
    resize: vertical;
    font-family: var(--font-mono);
    font-size: 0.9375rem;
    line-height: 1.5;
}

.text-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.stat-item {
    text-align: center;
    padding: var(--space-4);
    background: linear-gradient(135deg, var(--primary-50) 0%, var(--primary-100) 100%);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--primary-200);
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-600);
    font-family: var(--font-mono);
    line-height: 1;
    margin-bottom: var(--space-1);
}

.stat-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-600);
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.analysis-details {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.analysis-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-2) 0;
    border-bottom: 1px solid var(--gray-100);
}

.analysis-item:last-child {
    border-bottom: none;
}

.analysis-label {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--gray-600);
}

.analysis-value {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--gray-800);
    font-family: var(--font-mono);
}

.frequency-display {
    padding: var(--space-2);
}

.freq-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: var(--space-2);
}

.freq-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-2);
    background: var(--gray-50);
    border-radius: var(--border-radius);
    border: 1px solid var(--gray-200);
}

.freq-char {
    font-weight: 600;
    font-family: var(--font-mono);
    font-size: 1.125rem;
    color: var(--primary-600);
}

.freq-count {
    font-size: 0.875rem;
    color: var(--gray-600);
    font-family: var(--font-mono);
}

.text-muted {
    color: var(--gray-500);
    font-style: italic;
    text-align: center;
    padding: var(--space-4);
}

/* Responsive text counter */
@media (max-width: 768px) {
    .text-stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-2);
    }
    
    .stat-item {
        padding: var(--space-3);
    }
    
    .stat-number {
        font-size: 1.5rem;
    }
    
    .stat-label {
        font-size: 0.75rem;
    }
    
    .analysis-item {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-1);
        text-align: left;
    }
    
    .freq-list {
        grid-template-columns: 1fr;
    }
    
    .text-counter-textarea {
        min-height: 200px;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus states for accessibility */
.btn:focus,
.form-input:focus,
.form-select:focus,
.form-textarea:focus,
nav a:focus,
.logo:focus {
    outline: 2px solid var(--primary-blue);
    outline-offset: 2px;
}

/* Print styles */
@media print {
    header,
    footer,
    nav {
        display: none;
    }
    
    main {
        padding-top: 0;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid var(--gray-300);
    }
    
    .btn {
        display: none;
    }
}

/* Currency Converter Specific Styles */
.currency-converter-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.currency-selection-grid {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 1rem;
    align-items: end;
}

.currency-swap-container {
    display: flex;
    align-items: center;
    justify-content: center;
    padding-bottom: 2rem;
}

.swap-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    font-size: 1.2rem;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.swap-btn:hover {
    background: var(--primary-dark);
    transform: rotate(180deg);
}

.currency-result {
    text-align: center;
    padding: 2rem 1rem;
}

.conversion-display {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.from-amount,
.to-amount {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.amount {
    font-size: 2rem;
    font-weight: bold;
    color: var(--primary-color);
    font-variant-numeric: tabular-nums;
}

.currency {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.conversion-arrow {
    font-size: 1.5rem;
    color: var(--text-secondary);
    font-weight: bold;
}

.exchange-rate-info {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.rate-display {
    margin-bottom: 0.5rem;
}

.rate-label,
.update-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-right: 0.5rem;
}

.rate-value {
    font-weight: 600;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
}

.update-time {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-variant-numeric: tabular-nums;
}

.loading-spinner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    padding: 2rem 1rem;
    color: var(--text-secondary);
}

.spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--border-color);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.api-error {
    padding: 1rem;
    text-align: center;
}

.error-message {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1rem;
    background: #fef2f2;
    border: 1px solid #fecaca;
    border-radius: 6px;
    color: #dc2626;
    font-size: 0.9rem;
}

.error-icon {
    font-size: 1.1rem;
}

.conversion-grid .conversion-item.clickable:hover {
    background: var(--hover-bg);
    border-color: var(--primary-color);
    cursor: pointer;
    transform: translateY(-1px);
}

@media (max-width: 767px) {
    .currency-selection-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .currency-swap-container {
        order: -1;
        padding-bottom: 0;
    }
    
    .swap-btn {
        transform: rotate(90deg);
    }
    
    .swap-btn:hover {
        transform: rotate(270deg);
    }
    
    .conversion-display {
        flex-direction: column;
        gap: 1rem;
    }
    
    .conversion-arrow {
        transform: rotate(90deg);
    }
    
    .amount {
        font-size: 1.75rem;
    }
}

/* URL/Base64 Encoder/Decoder Styles */
.url-textarea,
.base64-textarea {
    font-family: 'SF Mono', 'Monaco', 'Cascadia Code', 'Roboto Mono', monospace;
    font-size: 0.9rem;
}

.url-stats,
.base64-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.url-components {
    display: grid;
    gap: 0.75rem;
}

.component-item,
.char-stat,
.analysis-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.component-item:last-child,
.char-stat:last-child,
.analysis-item:last-child {
    border-bottom: none;
}

.component-label,
.char-label,
.analysis-label {
    font-weight: 600;
    color: var(--text-secondary);
}

.component-value,
.char-value,
.analysis-value {
    font-family: 'SF Mono', 'Monaco', 'Cascadia Code', 'Roboto Mono', monospace;
    color: var(--text-primary);
    word-break: break-all;
}

.character-breakdown,
.analysis-grid {
    display: grid;
    gap: 0.5rem;
}

.validation-status {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem;
    border-radius: 6px;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
}

.status-indicator.success {
    background: #f0fdf4;
    border-color: #bbf7d0;
    color: #15803d;
}

.status-indicator.error {
    background: #fef2f2;
    border-color: #fecaca;
    color: #dc2626;
}

.status-icon {
    font-size: 1.1rem;
}

/* Password Generator Styles */
.password-generator-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.length-input-group {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.form-range {
    flex: 1;
    height: 20px; /* Make container height match thumb height for proper centering */
    background: transparent;
    outline: none;
    -webkit-appearance: none;
    cursor: pointer;
    position: relative;
}

.form-range::-webkit-slider-track {
    width: 100%;
    height: 6px;
    background: var(--gray-200);
    border-radius: 3px;
    position: relative;
}

.form-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    border: 2px solid white;
    transition: all 0.2s ease;
    margin-top: -7px; /* Center the thumb on the track: (20px thumb - 6px track) / 2 = 7px */
}

.form-range::-webkit-slider-thumb:hover {
    background: var(--primary-dark);
    transform: scale(1.1);
    box-shadow: 0 3px 6px rgba(0, 0, 0, 0.15);
}

.form-range::-moz-range-track {
    width: 100%;
    height: 6px;
    background: var(--gray-200);
    border-radius: 3px;
    border: none;
}

.form-range::-moz-range-thumb {
    width: 18px; /* Slightly smaller for Firefox to account for border */
    height: 18px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid white;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    transition: all 0.2s ease;
    margin-top: 0; /* Firefox handles centering differently */
}

.form-range::-moz-range-thumb:hover {
    background: var(--primary-dark);
    transform: scale(1.1);
    box-shadow: 0 3px 6px rgba(0, 0, 0, 0.15);
}

/* Progress fill effect for WebKit browsers */
.form-range::-webkit-slider-runnable-track {
    height: 6px;
    background: linear-gradient(to right, var(--primary-color) 0%, var(--primary-color) var(--range-progress, 0%), var(--gray-200) var(--range-progress, 0%), var(--gray-200) 100%);
    border-radius: 3px;
}

.length-input {
    width: 80px;
    text-align: center;
}

.password-display-container {
    margin: 1rem 0;
}

.password-display {
    position: relative;
}

.password-input {
    width: 100%;
    padding: 1rem;
    font-family: 'SF Mono', 'Monaco', 'Cascadia Code', 'Roboto Mono', monospace;
    font-size: 1.1rem;
    border: 2px solid var(--input-border);
    border-radius: 8px;
    background: var(--input-bg);
    color: var(--text-primary);
    letter-spacing: 1px;
}

.password-actions {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

.toggle-btn {
    background: var(--gray-100);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 0.5rem 0.75rem;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.2s ease;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
}

.toggle-btn:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.password-strength {
    margin-top: 1rem;
}

.strength-meter {
    width: 100%;
    height: 8px;
    background: var(--gray-200);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.strength-bar {
    height: 100%;
    width: 0;
    transition: width 0.3s ease, background-color 0.3s ease;
    border-radius: 4px;
}

.strength-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
}

.strength-label {
    color: var(--text-secondary);
}

.strength-text {
    font-weight: 600;
    color: var(--text-primary);
}

.strength-score {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.password-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.password-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--card-bg);
}

.password-item .password-input {
    flex: 1;
    margin: 0;
    padding: 0.5rem 0.75rem;
    font-size: 0.95rem;
    border: 1px solid var(--input-border);
}

/* Output Header Styles */
.output-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    gap: 1rem;
}

.output-header h2 {
    margin: 0;
    flex: 1;
}

/* Copy Button Styles */
.copy-btn {
    background: var(--primary-color);
    color: white;
    border: 1px solid var(--primary-color);
    border-radius: 6px;
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.25rem;
    text-decoration: none;
    min-height: 38px;
}

.copy-btn:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.copy-btn:active {
    transform: translateY(0);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.copy-btn.small {
    padding: 0.4rem 0.75rem;
    font-size: 0.85rem;
    min-width: auto;
    min-height: 32px;
}

@media (max-width: 767px) {
    .length-input-group {
        flex-direction: column;
        align-items: stretch;
        gap: 0.75rem;
    }
    
    .password-actions {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    .strength-info {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.25rem;
    }
    
    .password-item {
        flex-direction: column;
        align-items: stretch;
        gap: 0.5rem;
    }
    
    .url-stats,
    .base64-stats {
        grid-template-columns: 1fr;
    }
}

/* Random Number Generator Styles */
.random-results {
    text-align: center;
    padding: 2rem 1rem;
}

.number-display {
    margin-bottom: 2rem;
}

.large-number {
    font-size: 3rem;
    font-weight: bold;
    color: var(--primary-color);
    font-variant-numeric: tabular-nums;
    margin-bottom: 0.5rem;
}

.generation-info {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.numbers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.number-item {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 0.75rem;
    text-align: center;
}

.number-value {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-color);
    display: block;
    font-variant-numeric: tabular-nums;
}

.number-index {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.numbers-summary {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    padding: 1rem;
    background: var(--gray-50);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.summary-item {
    text-align: center;
}

.summary-label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.summary-value {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.history-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
}

.history-content {
    flex: 1;
}

.history-numbers {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.history-details {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* UUID Generator Styles */
.uuid-results {
    padding: 1rem 0;
}

.uuid-display {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.uuid-input {
    flex: 1;
    padding: 0.75rem;
    font-family: 'SF Mono', 'Monaco', 'Cascadia Code', 'Roboto Mono', monospace;
    font-size: 0.9rem;
    border: 2px solid var(--input-border);
    border-radius: 6px;
    background: var(--input-bg);
    color: var(--text-primary);
}

.uuid-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.uuid-item {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 0.75rem;
}

.uuid-content {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.uuid-number {
    font-size: 0.8rem;
    color: var(--text-secondary);
    min-width: 2rem;
}

.uuid-content .uuid-input {
    flex: 1;
    padding: 0.5rem;
    font-size: 0.85rem;
    border: 1px solid var(--input-border);
}

.uuid-info {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.info-item {
    text-align: center;
}

.info-label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.info-value {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
}

.uuid-breakdown {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
}

.breakdown-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.breakdown-item:last-child {
    border-bottom: none;
}

.breakdown-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.breakdown-value {
    font-family: 'SF Mono', 'Monaco', 'Cascadia Code', 'Roboto Mono', monospace;
    font-size: 0.85rem;
    color: var(--text-primary);
}

.uuid-actions {
    display: flex;
    gap: 0.5rem;
}

/* Coin Flip Styles */
.coin-flip-container {
    text-align: center;
    padding: 2rem 1rem;
}

.coin-display {
    perspective: 1000px;
    margin-bottom: 2rem;
}

.coin {
    width: 150px;
    height: 150px;
    margin: 0 auto;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.6s ease-in-out, scale 0.2s ease;
    cursor: pointer;
}

.coin:hover {
    scale: 1.05;
}

.coin:active {
    scale: 0.95;
}

.coin.flipping {
    animation: coinFlip 1s ease-in-out;
}

.coin.flipping .coin-side {
    opacity: 0;
}

@keyframes coinFlip {
    0% { transform: rotateY(0deg) rotateX(0deg); }
    25% { transform: rotateY(90deg) rotateX(180deg); }
    50% { transform: rotateY(180deg) rotateX(360deg); }
    75% { transform: rotateY(270deg) rotateX(540deg); }
    100% { transform: rotateY(360deg) rotateX(720deg); }
}

.coin-side {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    border: 4px solid #ffd700;
}

.coin-heads {
    background: linear-gradient(135deg, #ffd700 0%, #ffed4e 100%);
    color: #8b4513;
}

.coin-tails {
    background: linear-gradient(135deg, #c0c0c0 0%, #e8e8e8 100%);
    color: #4a4a4a;
    transform: rotateY(180deg);
}

.coin-text {
    font-size: 0.9rem;
    margin-bottom: 0.25rem;
    letter-spacing: 1px;
}

.coin-symbol {
    font-size: 2.5rem;
}

.flip-result {
    margin-bottom: 2rem;
    min-height: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.result-text {
    font-size: 1.5rem;
    font-weight: 600;
    transition: color 0.3s ease;
}

.result-text.heads {
    color: #ffd700;
}

.result-text.tails {
    color: #8b7355;
}

.flip-controls {
    display: flex;
    gap: 1rem;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
}

.coin-flip-btn {
    font-size: 1.1rem;
    padding: 0.75rem 1.5rem;
    min-width: 150px;
}

.flip-stats {
    text-align: center;
}

.stats-overview {
    margin-bottom: 2rem;
}

.stat-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-color);
}

.stat-content {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.stat-item.large {
    justify-content: center;
    flex-direction: column;
    padding: 1.5rem 0;
    border-bottom: 2px solid var(--border-color);
}

.stat-item.large .stat-value {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-top: 0.5rem;
}

.stat-item:last-child {
    border-bottom: none;
}

.stat-label {
    font-weight: 600;
    color: var(--text-secondary);
}

.stat-value {
    font-weight: bold;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
}

.stat-percentage {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-left: auto;
    flex-shrink: 0;
}

.stats-breakdown {
    margin-bottom: 2rem;
}

.stats-breakdown .stat-item {
    margin-bottom: 0.25rem;
}

.stats-breakdown .stat-item:last-child {
    margin-bottom: 0;
}

.visual-stats {
    margin-top: 1.5rem;
}

.stat-bar-container {
    background: var(--gray-100);
    border-radius: 8px;
    overflow: hidden;
}

.stat-bar {
    display: flex;
    height: 40px;
}

.stat-bar-heads {
    background: linear-gradient(90deg, #ffd700 0%, #ffed4e 100%);
    transition: width 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    color: #8b4513;
}

.stat-bar-tails {
    background: linear-gradient(90deg, #c0c0c0 0%, #e8e8e8 100%);
    transition: width 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    color: #4a4a4a;
}

.stat-bar-labels {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.recent-flips {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    max-height: 300px;
    overflow-y: auto;
}

.flip-history-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
}

.flip-history-item.heads {
    border-left: 4px solid #ffd700;
}

.flip-history-item.tails {
    border-left: 4px solid #c0c0c0;
}

.flip-number {
    font-size: 0.8rem;
    color: var(--text-secondary);
    min-width: 2rem;
}

.flip-result-icon {
    font-size: 1.2rem;
}

.flip-result-text {
    font-weight: 600;
    color: var(--text-primary);
    flex: 1;
}

.flip-time {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

@media (max-width: 767px) {
    .numbers-grid {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
        gap: 0.5rem;
    }
    
    .numbers-summary {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }
    
    .uuid-content {
        flex-direction: column;
        align-items: stretch;
        gap: 0.5rem;
    }
    
    .uuid-number {
        min-width: auto;
        text-align: center;
    }
    
    .uuid-info {
        grid-template-columns: 1fr;
    }
    
    .uuid-breakdown {
        grid-template-columns: 1fr;
    }
}

/* Colour Palette Generator Styles */
.colour-input-container {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.colour-picker {
    width: 60px;
    height: 50px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    background: none;
}

.colour-picker::-webkit-color-swatch-wrapper {
    padding: 0;
}

.colour-picker::-webkit-color-swatch {
    border: none;
    border-radius: 6px;
}

.colour-hex-input {
    flex: 1;
    font-family: var(--font-mono);
    text-transform: uppercase;
}

.palette-display {
    padding: 1.5rem 0;
}

.palette-colours {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.colour-swatch {
    aspect-ratio: 1;
    border-radius: 12px;
    position: relative;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    overflow: hidden;
    border: 2px solid var(--border-color);
}

.colour-swatch:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.colour-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    opacity: 0;
    transition: opacity 0.2s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1rem;
}

.colour-swatch:hover .colour-overlay {
    opacity: 1;
}

.colour-code {
    color: white;
    font-family: var(--font-mono);
    font-weight: 600;
    font-size: 0.875rem;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

.format-tabs {
    display: flex;
    gap: 0.25rem;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.format-tab {
    padding: 0.75rem 1.5rem;
    background: none;
    border: none;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    border-bottom: 2px solid transparent;
}

.format-tab:hover {
    color: var(--text-primary);
    background: var(--gray-50);
}

.format-tab.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.colour-format-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}

.colour-format-item:last-child {
    border-bottom: none;
}

.colour-preview {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    border: 2px solid var(--border-color);
    flex-shrink: 0;
}

.colour-format-code {
    flex: 1;
    font-family: var(--font-mono);
    font-size: 0.9375rem;
    color: var(--text-primary);
}

.palette-actions {
    display: flex;
    gap: 0.5rem;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .colour-input-container {
        flex-direction: column;
        align-items: stretch;
        gap: 0.75rem;
    }
    
    .colour-picker {
        width: 100%;
        height: 60px;
    }
    
    .palette-colours {
        grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
        gap: 0.75rem;
    }
    
    .colour-format-item {
        flex-direction: column;
        align-items: stretch;
        gap: 0.5rem;
        text-align: center;
    }
    
    .colour-preview {
        width: 100%;
        height: 50px;
    }
    
    .palette-actions {
        flex-direction: column;
    }
}

/* QR Code Generator Styles */
.qr-generator-form .form-group {
    margin-bottom: 1.5rem;
}

.qr-display {
    text-align: center;
    padding: 2rem 1rem;
    min-height: 500px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.qr-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    min-height: 400px;
}

.placeholder-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.placeholder-text {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.placeholder-subtext {
    font-size: 0.9375rem;
    opacity: 0.7;
}

.qr-result {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

#qr-canvas {
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.07);
    background: white;
    padding: 1rem;
}

.qr-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    width: 100%;
    max-width: 500px;
}

.qr-actions {
    display: flex;
    gap: 0.5rem;
}

.form-textarea {
    min-height: 100px;
    resize: vertical;
    font-family: inherit;
}

.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml;charset=US-ASCII,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 4 5'><path fill='%23666' d='m2 0-2 2h4zm0 5 2-2H0z'/></svg>");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    background-size: 0.65rem auto;
    padding-right: 2.5rem;
}

.usage-instructions ul {
    list-style: none;
    padding: 0;
}

.usage-instructions li {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
}

.usage-instructions li:last-child {
    border-bottom: none;
}

.usage-instructions strong {
    color: var(--primary-color);
    min-width: 120px;
    flex-shrink: 0;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .qr-display {
        padding: 1rem 0.5rem;
        min-height: 350px;
    }
    
    .placeholder-icon {
        font-size: 3rem;
    }
    
    .placeholder-text {
        font-size: 1.125rem;
    }
    
    #qr-canvas {
        max-width: 100%;
        height: auto;
    }
    
    .qr-info {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }
    
    .qr-actions {
        flex-direction: column;
        width: 100%;
    }
    
    .usage-instructions li {
        flex-direction: column;
        gap: 0.5rem;
        text-align: left;
    }
    
    .usage-instructions strong {
        min-width: auto;
    }
}

/* Email Validator Styles */
.email-validator-form .form-group {
    margin-bottom: 1.5rem;
}

.validation-display {
    padding: 1.5rem 0;
    min-height: 200px;
}

.validation-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    min-height: 150px;
    text-align: center;
}

.validation-results {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.email-validation-result {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    background: var(--background-color);
}

.email-validation-result.valid {
    border-left: 4px solid #10b981;
    background: #f0fdf4;
}

.email-validation-result.invalid {
    border-left: 4px solid #ef4444;
    background: #fef2f2;
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.email-address {
    font-family: var(--font-mono);
    font-weight: 600;
    color: var(--text-primary);
    word-break: break-all;
}

.validation-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.875rem;
}

.status-valid {
    background: #dcfce7;
    color: #16a34a;
}

.status-invalid {
    background: #fee2e2;
    color: #dc2626;
}

.status-warning {
    background: #fef3c7;
    color: #d97706;
}

.validation-issues {
    margin-top: 0.75rem;
    font-size: 0.9375rem;
}

.validation-issues strong {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.validation-issues ul {
    margin: 0;
    padding-left: 1.25rem;
    list-style-type: disc;
}

.validation-issues li {
    margin-bottom: 0.25rem;
    color: var(--text-secondary);
}

.validation-issues.errors strong {
    color: #dc2626;
}

.validation-issues.errors li {
    color: #dc2626;
}

.validation-issues.warnings strong {
    color: #d97706;
}

.validation-issues.warnings li {
    color: #d97706;
}

.validation-issues.suggestions strong {
    color: #3b82f6;
}

.validation-issues.suggestions li {
    color: #3b82f6;
}

.validation-stats {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.validation-actions {
    display: flex;
    gap: 0.5rem;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .result-header {
        flex-direction: column;
        align-items: stretch;
        gap: 0.75rem;
    }
    
    .validation-status {
        justify-content: center;
    }
    
    .validation-actions {
        flex-direction: column;
    }
    
    .email-address {
        word-break: break-word;
        text-align: center;
    }
}

/* QR Code Customization Styles */
.customization-options {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    background: var(--gray-50);
    margin-top: 1rem;
}

.colour-scheme-selector, .style-selector {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 0.5rem;
}

.colour-option, .style-option {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    background: white;
    min-width: 80px;
}

.colour-option:hover, .style-option:hover {
    border-color: var(--primary-color);
    transform: translateY(-1px);
}

.colour-option.active, .style-option.active {
    border-color: var(--primary-color);
    background: var(--primary-color);
    color: white;
}

.colour-preview {
    display: flex;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.colour-dark, .colour-light {
    flex: 1;
}

.colour-dark {
    border-radius: 50% 0 0 50%;
}

.colour-light {
    border-radius: 0 50% 50% 0;
}

.style-preview {
    font-size: 2rem;
    line-height: 1;
}

.colour-option span, .style-option span {
    font-size: 0.875rem;
    font-weight: 500;
    text-align: center;
}

.custom-colours {
    margin-top: 1rem;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: white;
}

.colour-input-row {
    display: flex;
    gap: 1rem;
}

.colour-input-group {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.colour-input-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.colour-input-group input[type="color"] {
    width: 100%;
    height: 50px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    padding: 0;
}

.logo-preview {
    margin-top: 1rem;
    padding: 1rem;
    border: 1px dashed var(--border-color);
    border-radius: 8px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    background: white;
}

.logo-preview img {
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.btn-small {
    padding: 0.375rem 0.75rem;
    font-size: 0.75rem;
    background: #ef4444;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.2s ease;
}

.btn-small:hover {
    background: #dc2626;
}

.qr-with-text {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.07);
}

.qr-custom-text {
    font-family: 'Arial', sans-serif;
    font-weight: 600;
    font-size: 1.125rem;
    color: var(--text-primary);
    text-align: center;
    margin: 0;
    max-width: 300px;
    word-wrap: break-word;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .colour-scheme-selector, .style-selector {
        gap: 0.75rem;
    }
    
    .colour-option, .style-option {
        min-width: 70px;
        padding: 0.5rem;
    }
    
    .colour-preview {
        width: 35px;
        height: 35px;
    }
    
    .colour-input-row {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    .customization-options {
        padding: 1rem;
    }
    
    .flip-controls {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    .coin {
        width: 120px;
        height: 120px;
    }
    
    .coin-symbol {
        font-size: 2rem;
    }
    
    .uuid-actions {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .flip-history-item {
        flex-direction: column;
        align-items: stretch;
        gap: 0.5rem;
        text-align: center;
    }
}