/* 
 * Trocador Size Calculator
 * Stylesheet - Clean, Professional, Mobile-First Design
 * Free Educational Tool for Parents
 */

/* ===== CSS Variables ===== */
:root {
    /* Primary Colors - Soft, Baby-Friendly Palette */
    --color-primary: #6B9AC4;
    --color-primary-dark: #4A7BA7;
    --color-primary-light: #A8C5DB;
    
    /* Secondary Colors */
    --color-secondary: #97D8C4;
    --color-secondary-dark: #6BC4A6;
    
    /* Accent Colors */
    --color-accent: #F4B860;
    --color-accent-light: #F7D08A;
    
    /* Neutral Colors */
    --color-white: #FFFFFF;
    --color-off-white: #F9FAFB;
    --color-gray-100: #F3F4F6;
    --color-gray-200: #E5E7EB;
    --color-gray-300: #D1D5DB;
    --color-gray-400: #9CA3AF;
    --color-gray-500: #6B7280;
    --color-gray-600: #4B5563;
    --color-gray-700: #374151;
    --color-gray-800: #1F2937;
    
    /* Status Colors */
    --color-success: #10B981;
    --color-warning: #F59E0B;
    --color-error: #EF4444;
    --color-info: #3B82F6;
    
    /* Typography */
    --font-family: 'Nunito', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;
}

/* ===== Reset & Base Styles ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-gray-700);
    background-color: var(--color-off-white);
    min-height: 100vh;
}

/* Skip Link for Accessibility */
.skip-link {
    position: absolute;
    top: -100%;
    left: var(--spacing-md);
    background: var(--color-primary-dark);
    color: var(--color-white);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    z-index: 1000;
    font-weight: 600;
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: var(--spacing-md);
}

/* Screen Reader Only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

img {
    max-width: 100%;
    height: auto;
}

a {
    color: var(--color-primary-dark);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary);
}

ul {
    list-style: none;
}

/* ===== Container ===== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
    color: var(--color-gray-800);
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: var(--font-size-3xl);
}

h2 {
    font-size: var(--font-size-2xl);
    margin-top: var(--spacing-xl);
}

h3 {
    font-size: var(--font-size-xl);
}

h4 {
    font-size: var(--font-size-lg);
}

p {
    margin-bottom: var(--spacing-md);
}

/* ===== Header ===== */
.header {
    background-color: var(--color-white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    font-size: var(--font-size-2xl);
}

.logo-text {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-primary-dark);
}

.nav {
    display: flex;
    gap: var(--spacing-lg);
}

.nav a {
    font-weight: 600;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.nav a i {
    font-size: var(--font-size-sm);
    transition: transform var(--transition-fast);
}

.nav a:hover {
    background-color: var(--color-primary);
    color: var(--color-white);
}

.nav a:hover i {
    transform: scale(1.1);
}

/* Mobile Menu Toggle Button */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: var(--font-size-xl);
    color: var(--color-primary-dark);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast);
}

.mobile-menu-toggle:hover {
    background-color: var(--color-gray-100);
}

.mobile-menu-toggle:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* ===== Hero Section ===== */
.hero {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 50%, var(--color-secondary-dark) 100%);
    color: var(--color-white);
    padding: var(--spacing-3xl) 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.5;
}

.hero .container {
    position: relative;
    z-index: 1;
}

.hero-icon {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-lg);
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.hero h1 {
    color: var(--color-white);
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-md);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
    opacity: 0.95;
    line-height: 1.7;
}

.hero-cta {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: var(--color-white);
    color: var(--color-primary-dark);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-full);
    font-weight: 700;
    text-decoration: none;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-lg);
}

.hero-cta:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
    color: var(--color-primary);
}

.hero-cta i {
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(5px); }
    60% { transform: translateY(3px); }
}

/* ===== Main Content ===== */
.main-content {
    padding: var(--spacing-2xl) 0;
}

/* ===== Intro Section ===== */
.intro-section {
    background-color: var(--color-white);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    margin-bottom: var(--spacing-2xl);
    text-align: center;
}

.intro-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--color-accent-light), var(--color-accent));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-lg);
    font-size: 2rem;
    color: var(--color-white);
    box-shadow: var(--shadow-md);
}

.intro-section h2 {
    margin-top: 0;
    color: var(--color-gray-800);
}

.intro-section p {
    max-width: 700px;
    margin: 0 auto var(--spacing-xl);
    color: var(--color-gray-600);
    line-height: 1.8;
}

.intro-features {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
}

.intro-feature {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--color-gray-100);
    border-radius: var(--radius-full);
    font-weight: 600;
    color: var(--color-gray-700);
    transition: all var(--transition-fast);
}

.intro-feature:hover {
    background: var(--color-primary-light);
    color: var(--color-white);
    transform: translateY(-2px);
}

.intro-feature i {
    color: var(--color-primary);
    font-size: var(--font-size-lg);
}

.intro-feature:hover i {
    color: var(--color-white);
}

/* ===== Calculator Section ===== */
.calculator-section {
    margin-bottom: var(--spacing-2xl);
}

.calculator-card {
    background-color: var(--color-white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-2xl);
    overflow: hidden;
    border: 1px solid var(--color-gray-200);
}

.card-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--color-gray-100);
}

.card-header i {
    font-size: 1.75rem;
    color: var(--color-primary);
    background: var(--color-primary-light);
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-lg);
}

.card-header h2 {
    margin: 0;
    color: var(--color-gray-800);
}

.calculator-description {
    color: var(--color-gray-500);
    margin-bottom: var(--spacing-xl);
}

/* ===== Form Styles ===== */
.calculator-form {
    display: grid;
    gap: var(--spacing-lg);
    max-width: 500px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.form-group label {
    font-weight: 600;
    color: var(--color-gray-700);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.label-icon {
    color: var(--color-primary);
    width: 20px;
    text-align: center;
}

.form-group input,
.form-group select {
    padding: var(--spacing-md) var(--spacing-lg);
    border: 2px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
    font-family: inherit;
    transition: all var(--transition-fast);
    background-color: var(--color-white);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(107, 154, 196, 0.15);
    background-color: var(--color-white);
}

.form-group input:hover,
.form-group select:hover {
    border-color: var(--color-gray-400);
}

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

.input-with-unit {
    display: flex;
    gap: var(--spacing-sm);
}

.input-with-unit input {
    flex: 1;
}

.input-with-unit select {
    width: 80px;
    cursor: pointer;
}

.form-help {
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
}

/* Form Validation Styles */
.form-error {
    font-size: var(--font-size-sm);
    color: var(--color-error);
    min-height: 1.25rem;
    display: block;
}

.form-group input.input-error {
    border-color: var(--color-error);
    background-color: rgba(239, 68, 68, 0.05);
}

.form-group input.input-error:focus {
    border-color: var(--color-error);
    box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.15);
}

.form-group input.input-valid {
    border-color: var(--color-success);
    background-color: rgba(16, 185, 129, 0.05);
}

.form-group input.input-valid:focus {
    border-color: var(--color-success);
    box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.15);
}

.required {
    color: var(--color-error);
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-icon {
    font-size: var(--font-size-base);
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-white);
    box-shadow: var(--shadow-md), 0 4px 15px rgba(107, 154, 196, 0.4);
    position: relative;
    overflow: hidden;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.btn-primary:hover::before {
    left: 100%;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg), 0 6px 20px rgba(107, 154, 196, 0.5);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background-color: var(--color-secondary);
    color: var(--color-white);
}

.btn-secondary:hover {
    background-color: var(--color-secondary-dark);
}

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--color-gray-300);
    color: var(--color-gray-600);
}

.btn-outline:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* ===== Results Section ===== */
.results-section {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    border-top: 2px dashed var(--color-gray-200);
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.results-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
}

.results-header i {
    font-size: 2rem;
    color: var(--color-success);
}

.results-header h3 {
    color: var(--color-success);
    margin: 0;
}

.dimension-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.dimension-card {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-white);
    padding: var(--spacing-xl) var(--spacing-lg);
    border-radius: var(--radius-xl);
    text-align: center;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.dimension-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 60%);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.dimension-card:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: var(--shadow-xl);
}

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

.dimension-label {
    display: block;
    font-size: var(--font-size-sm);
    opacity: 0.9;
    margin-bottom: var(--spacing-xs);
}

.dimension-value {
    display: block;
    font-size: var(--font-size-3xl);
    font-weight: 700;
}

.dimension-unit {
    font-size: var(--font-size-sm);
    opacity: 0.9;
}

.size-category {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.category-label {
    font-weight: 600;
    color: var(--color-gray-600);
}

.category-badge {
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-full);
    font-weight: 700;
    text-transform: uppercase;
    font-size: var(--font-size-sm);
}

.results-explanation {
    background-color: var(--color-gray-100);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-xl);
    border-left: 4px solid var(--color-primary);
}

.results-explanation p {
    margin: 0;
    color: var(--color-gray-600);
}

.safety-tips-result {
    background: linear-gradient(135deg, #FEF3C7 0%, #FDE68A 100%);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-xl);
    border: 1px solid #F59E0B;
}

.safety-tips-result h4 {
    color: var(--color-gray-800);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.safety-tips-result h4 i {
    color: var(--color-warning);
}

.safety-tips-result ul {
    display: grid;
    gap: var(--spacing-sm);
}

.safety-tips-result li {
    padding-left: var(--spacing-lg);
    position: relative;
}

.safety-tips-result li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-success);
    font-weight: bold;
}

.results-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    justify-content: center;
}

/* ===== Section Headers ===== */
.section-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.section-header i {
    font-size: 1.5rem;
    color: var(--color-white);
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.section-header h2 {
    margin: 0;
    color: var(--color-gray-800);
}

/* ===== Safety Section ===== */
.safety-section {
    background-color: var(--color-white);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    margin-bottom: var(--spacing-2xl);
    border: 1px solid var(--color-gray-200);
}

.safety-section > p {
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-xl);
}

.checklist-card {
    background: linear-gradient(135deg, var(--color-gray-100) 0%, var(--color-off-white) 100%);
    padding: var(--spacing-lg);
    border-radius: var(--radius-xl);
    margin-bottom: var(--spacing-xl);
    border: 1px solid var(--color-gray-200);
}

.checklist-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-sm);
    transition: all var(--transition-fast);
    border: 1px solid transparent;
    cursor: pointer;
}

.checklist-item:last-child {
    margin-bottom: 0;
}

.checklist-item:hover {
    border-color: var(--color-primary-light);
    box-shadow: var(--shadow-sm);
}

.checklist-item input[type="checkbox"] {
    width: 22px;
    height: 22px;
    cursor: pointer;
    accent-color: var(--color-success);
    flex-shrink: 0;
}

.checklist-item input[type="checkbox"]:checked + label {
    color: var(--color-success);
    text-decoration: line-through;
}

.checklist-item label {
    cursor: pointer;
    flex: 1;
    line-height: 1.5;
}

/* ===== Size Guide Section ===== */
.size-guide-section {
    background-color: var(--color-white);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    margin-bottom: var(--spacing-2xl);
    border: 1px solid var(--color-gray-200);
}

.size-guide-section > p {
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-lg);
}

.table-responsive {
    overflow-x: auto;
}

.size-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: var(--spacing-md);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.size-table th,
.size-table td {
    padding: var(--spacing-md) var(--spacing-lg);
    text-align: center;
    border-bottom: 1px solid var(--color-gray-200);
}

.size-table th {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: var(--color-white);
    font-weight: 600;
    text-transform: uppercase;
    font-size: var(--font-size-sm);
    letter-spacing: 0.5px;
}

.size-table tbody tr {
    transition: all var(--transition-fast);
}

.size-table tbody tr:hover {
    background-color: var(--color-primary-light);
    color: var(--color-white);
}

.size-table tbody tr:last-child td {
    border-bottom: none;
}

.badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: 700;
    text-transform: uppercase;
}

.badge-small {
    background-color: #D1FAE5;
    color: #065F46;
}

.badge-medium {
    background-color: #FEF3C7;
    color: #92400E;
}

.badge-large {
    background-color: #DBEAFE;
    color: #1E40AF;
}

.badge-xlarge {
    background-color: #EDE9FE;
    color: #5B21B6;
}

/* ===== About Section ===== */
.about-section {
    background-color: var(--color-white);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    margin-bottom: var(--spacing-2xl);
    border: 1px solid var(--color-gray-200);
}

.about-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.about-card {
    background: linear-gradient(135deg, var(--color-gray-100) 0%, var(--color-off-white) 100%);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    text-align: center;
    transition: all var(--transition-normal);
    border: 1px solid var(--color-gray-200);
}

.about-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary-light);
}

.about-card-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
    font-size: 1.5rem;
    color: var(--color-white);
    box-shadow: var(--shadow-md);
}

.about-card h3 {
    color: var(--color-gray-800);
    margin-bottom: var(--spacing-sm);
}

.about-card p {
    margin: 0;
    color: var(--color-gray-600);
    font-size: var(--font-size-sm);
    line-height: 1.7;
}

/* ===== Footer ===== */
.footer {
    background: linear-gradient(135deg, var(--color-gray-800) 0%, #111827 100%);
    color: var(--color-gray-300);
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-section h4 {
    color: var(--color-white);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.footer-section h4 i {
    color: var(--color-primary-light);
}

.footer-section p {
    font-size: var(--font-size-sm);
    margin: 0;
    line-height: 1.7;
}

.footer-section ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-section a {
    color: var(--color-gray-400);
    font-size: var(--font-size-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: all var(--transition-fast);
}

.footer-section a:hover {
    color: var(--color-primary-light);
    transform: translateX(5px);
}

.footer-section a i {
    width: 16px;
}

.footer-bottom {
    border-top: 1px solid var(--color-gray-700);
    padding-top: var(--spacing-lg);
    text-align: center;
}

.footer-bottom p {
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
    margin: 0;
}

/* ===== Modal ===== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: var(--spacing-md);
}

.modal-content {
    background-color: var(--color-white);
    border-radius: var(--radius-xl);
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--color-gray-200);
}

.modal-header h3 {
    margin: 0;
}

.modal-close {
    background: var(--color-gray-100);
    border: none;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    cursor: pointer;
    color: var(--color-gray-500);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--color-error);
    color: var(--color-white);
}

.modal-body {
    padding: var(--spacing-lg);
}

.share-buttons {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.share-btn {
    flex: 1;
    min-width: 100px;
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-lg);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.share-btn i {
    font-size: var(--font-size-lg);
}

.share-btn.whatsapp {
    background: linear-gradient(135deg, #25D366, #128C7E);
    color: white;
}

.share-btn.email {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: white;
}

.share-btn.copy {
    background: linear-gradient(135deg, var(--color-gray-600), var(--color-gray-700));
    color: white;
}

.share-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.share-text-container {
    margin-top: var(--spacing-md);
}

.share-text-container textarea {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: var(--font-size-sm);
    resize: none;
}

/* ===== Utility Classes ===== */
.hidden {
    display: none !important;
}

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

/* ===== Print Styles ===== */
.print-only {
    display: none;
}

@media print {
    body * {
        visibility: hidden;
    }
    
    .print-only,
    .print-only * {
        visibility: visible;
    }
    
    .print-only {
        display: block;
        position: absolute;
        left: 0;
        top: 0;
        width: 100%;
        padding: 20px;
    }
    
    .print-header {
        text-align: center;
        margin-bottom: 30px;
        border-bottom: 2px solid #333;
        padding-bottom: 20px;
    }
    
    .print-header h1 {
        font-size: 24px;
        margin-bottom: 10px;
    }
    
    .print-content {
        padding: 20px 0;
    }
    
    .print-footer {
        margin-top: 40px;
        padding-top: 20px;
        border-top: 1px solid #ccc;
        font-size: 12px;
        color: #666;
    }
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    :root {
        --font-size-4xl: 1.75rem;
        --font-size-3xl: 1.5rem;
        --font-size-2xl: 1.25rem;
        --font-size-xl: 1.125rem;
    }
    
    .header .container {
        flex-wrap: wrap;
        position: relative;
    }
    
    .mobile-menu-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    .nav {
        display: none;
        flex-direction: column;
        width: 100%;
        padding-top: var(--spacing-md);
        gap: var(--spacing-xs);
        order: 3;
    }
    
    .nav.nav-open {
        display: flex;
    }
    
    .nav a {
        font-size: var(--font-size-base);
        padding: var(--spacing-sm) var(--spacing-md);
        width: 100%;
        justify-content: flex-start;
        border-radius: var(--radius-md);
    }
    
    .hero {
        padding: var(--spacing-2xl) 0;
    }
    
    .hero-icon {
        font-size: 2.5rem;
    }
    
    .intro-features {
        flex-direction: column;
        align-items: center;
    }
    
    .calculator-card,
    .intro-section,
    .safety-section,
    .size-guide-section,
    .about-section {
        padding: var(--spacing-lg);
    }
    
    .dimension-cards {
        grid-template-columns: 1fr;
    }
    
    .results-actions {
        flex-direction: column;
    }
    
    .results-actions .btn {
        width: 100%;
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .product-categories {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .size-table {
        font-size: var(--font-size-sm);
    }
    
    .size-table th,
    .size-table td {
        padding: var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .input-with-unit {
        flex-direction: column;
    }
    
    .input-with-unit select {
        width: 100%;
    }
    
    .share-buttons {
        flex-direction: column;
    }
    
    .share-btn {
        width: 100%;
    }
}

/* ===== Accessibility ===== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}

/* Focus styles for accessibility */
:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 2px;
}