/* ============================================
   Epoch Time Converter - Main Stylesheet
   Modern, Fast, SEO-Optimized Design
   ============================================ */

/* CSS Variables for Theming */
:root {
    /* Primary Colors - Deep Blue to Cyan Gradient */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    --primary-color: #667eea;
    --primary-dark: #5a67d8;
    --primary-light: #a3bffa;

    /* Accent Colors */
    --accent-cyan: #00d4ff;
    --accent-purple: #764ba2;
    --accent-pink: #f093fb;

    /* Background Colors */
    --bg-dark: #0f0f23;
    --bg-darker: #0a0a1a;
    --bg-card: rgba(255, 255, 255, 0.03);
    --bg-card-hover: rgba(255, 255, 255, 0.06);
    --bg-glass: rgba(255, 255, 255, 0.05);

    /* Text Colors */
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-muted: rgba(255, 255, 255, 0.5);

    /* Border Colors */
    --border-color: rgba(255, 255, 255, 0.1);
    --border-glow: rgba(102, 126, 234, 0.5);

    /* Shadows */
    --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 30px rgba(102, 126, 234, 0.3);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Font */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Background Pattern */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(ellipse at 20% 20%, rgba(102, 126, 234, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(118, 75, 162, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(240, 147, 251, 0.05) 0%, transparent 70%);
    pointer-events: none;
    z-index: -1;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

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

a:hover {
    color: var(--accent-cyan);
}

/* ============================================
   Header & Navigation
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(15, 15, 35, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text-primary);
}

.logo-icon {
    font-size: 1.5rem;
}

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

.logo:hover .logo-icon {
    animation: pulse 0.5s ease;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
}

.nav-links a {
    color: var(--text-secondary);
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text-primary);
    background: var(--bg-glass);
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.mobile-menu-btn span {
    display: block;
    width: 25px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: rgba(15, 15, 35, 0.98);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md);
    z-index: 999;
}

.mobile-menu.active {
    display: block;
}

.mobile-nav-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.mobile-nav-links a {
    display: block;
    padding: var(--spacing-sm);
    color: var(--text-primary);
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.mobile-nav-links a:hover {
    background: var(--bg-glass);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    padding: 140px 0 80px;
    position: relative;
    overflow: hidden;
}

.hero-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 0.6s ease;
}

.badge-icon {
    font-size: 1rem;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 0.6s ease 0.1s both;
}

.gradient-text {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: clamp(1.25rem, 3vw, 2rem);
    font-weight: 400;
    color: var(--text-secondary);
}

.hero-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    animation: fadeInUp 0.6s ease 0.2s both;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    animation: fadeInUp 0.6s ease 0.3s both;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
}

.stat-icon {
    font-size: 1.5rem;
}

.stat-info {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.stat-value {
    font-weight: 700;
    font-size: 1.125rem;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Hero Background Effects */
.hero-bg-effects {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    overflow: hidden;
}

.floating-shape {
    position: absolute;
    border-radius: 50%;
    filter: blur(60px);
    opacity: 0.3;
    animation: float 20s ease-in-out infinite;
}

.shape-1 {
    width: 400px;
    height: 400px;
    background: var(--primary-color);
    top: -100px;
    right: -100px;
}

.shape-2 {
    width: 300px;
    height: 300px;
    background: var(--accent-purple);
    bottom: 0;
    left: -100px;
    animation-delay: -7s;
}

.shape-3 {
    width: 200px;
    height: 200px;
    background: var(--accent-cyan);
    top: 50%;
    left: 50%;
    animation-delay: -14s;
}

/* ============================================
   Live Time Section
   ============================================ */
.live-time-section {
    padding: var(--spacing-lg) 0;
}

.live-time-card {
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    backdrop-filter: blur(10px);
}

.live-time-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.875rem;
    color: var(--text-muted);
}

.pulse-dot {
    width: 10px;
    height: 10px;
    background: #22c55e;
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

.live-time-display {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
}

.epoch-display {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    font-weight: 800;
    font-family: 'Courier New', monospace;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.human-display {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.copy-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-full);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.copy-btn:hover {
    background: var(--bg-card-hover);
    border-color: var(--primary-color);
}

/* ============================================
   Converter Section
   ============================================ */
.converter-section {
    padding: var(--spacing-2xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.section-title .icon {
    font-size: 1.25em;
}

.section-subtitle {
    color: var(--text-secondary);
    font-size: 1.125rem;
}

.converter-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-lg);
}

.converter-card {
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: all var(--transition-normal);
}

.converter-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-glow);
}

.card-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: rgba(102, 126, 234, 0.1);
    border-bottom: 1px solid var(--border-color);
}

.card-icon {
    font-size: 1.5rem;
}

.card-header h3 {
    flex: 1;
    font-size: 1.125rem;
    font-weight: 600;
}

.card-badge {
    background: var(--primary-gradient);
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
}

.card-body {
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

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

.input-group label {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.label-icon {
    font-size: 1rem;
}

.input-wrapper {
    display: flex;
    gap: var(--spacing-xs);
}

.input-field {
    flex: 1;
    background: var(--bg-darker);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm);
    color: var(--text-primary);
    font-size: 1rem;
    font-family: inherit;
    transition: all var(--transition-fast);
}

.input-field:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
}

.input-field::placeholder {
    color: var(--text-muted);
}

.input-btn {
    background: var(--primary-gradient);
    border: none;
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    color: white;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.input-btn:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

.select-field {
    width: 100%;
    background: var(--bg-darker);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm);
    color: var(--text-primary);
    font-size: 0.875rem;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.select-field:focus {
    outline: none;
    border-color: var(--primary-color);
}

.options-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
}

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

.datetime-inputs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
}

.convert-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    background: var(--primary-gradient);
    border: none;
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    color: white;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.convert-btn.secondary {
    background: linear-gradient(135deg, #764ba2 0%, #667eea 100%);
}

.btn-icon {
    font-size: 1.125rem;
}

.result-area {
    background: var(--bg-darker);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    min-height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.result-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--text-muted);
    font-size: 0.875rem;
}

.placeholder-icon {
    font-size: 2rem;
    opacity: 0.5;
}

.result-content {
    width: 100%;
}

.result-row {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-xs) 0;
    border-bottom: 1px solid var(--border-color);
}

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

.result-label {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.result-value {
    font-family: 'Courier New', monospace;
    font-weight: 600;
    cursor: pointer;
    transition: color var(--transition-fast);
}

.result-value:hover {
    color: var(--accent-cyan);
}

/* ============================================
   Reference Table Section
   ============================================ */
.reference-section {
    padding: var(--spacing-2xl) 0;
}

.reference-table-wrapper {
    overflow-x: auto;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.reference-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-glass);
}

.reference-table th,
.reference-table td {
    padding: var(--spacing-sm) var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.reference-table th {
    background: rgba(102, 126, 234, 0.1);
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-secondary);
    white-space: nowrap;
}

.th-icon {
    margin-right: var(--spacing-xs);
}

.reference-table td {
    font-size: 0.875rem;
}

.reference-table tr:hover {
    background: var(--bg-card-hover);
}

.reference-table .copyable {
    font-family: 'Courier New', monospace;
    cursor: pointer;
    transition: color var(--transition-fast);
}

.reference-table .copyable:hover {
    color: var(--accent-cyan);
}

/* ============================================
   Tools Section
   ============================================ */
.tools-section {
    padding: var(--spacing-2xl) 0;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.tool-card {
    display: flex;
    flex-direction: column;
    padding: var(--spacing-lg);
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

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

.tool-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.tool-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.tool-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    flex: 1;
}

.tool-arrow {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    font-size: 1.25rem;
    color: var(--text-muted);
    transition: all var(--transition-fast);
}

.tool-card:hover .tool-arrow {
    color: var(--accent-cyan);
    transform: translateX(4px);
}

/* ============================================
   Info Section
   ============================================ */
.info-section {
    padding: var(--spacing-2xl) 0;
}

.info-grid {
    display: grid;
    grid-template-columns: 1fr 350px;
    gap: var(--spacing-xl);
}

.info-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.info-content {
    color: var(--text-secondary);
    line-height: 1.8;
}

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

.info-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin: var(--spacing-md) 0;
}

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

.list-icon {
    font-size: 1.25rem;
}

.info-sidebar {
    position: sticky;
    top: 90px;
    align-self: start;
}

.quick-facts {
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
}

.quick-facts h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.quick-facts ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.quick-facts li {
    display: flex;
    gap: var(--spacing-sm);
}

.fact-icon {
    font-size: 1.25rem;
}

.quick-facts li div {
    display: flex;
    flex-direction: column;
}

.quick-facts li strong {
    font-size: 0.875rem;
    color: var(--text-primary);
}

.quick-facts li span {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-family: 'Courier New', monospace;
}

/* ============================================
   How To Section
   ============================================ */
.howto-section {
    padding: var(--spacing-2xl) 0;
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.step-card {
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    position: relative;
}

.step-number {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 30px;
    height: 30px;
    background: var(--primary-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.875rem;
}

.step-icon {
    font-size: 2.5rem;
    margin: var(--spacing-sm) 0;
}

.step-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.step-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* ============================================
   Articles Section
   ============================================ */
.articles-section {
    padding: var(--spacing-2xl) 0;
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

.article-card {
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-normal);
}

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

.article-image {
    height: 160px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.2), rgba(118, 75, 162, 0.2));
    display: flex;
    align-items: center;
    justify-content: center;
}

.article-emoji {
    font-size: 4rem;
}

.article-content {
    padding: var(--spacing-md);
}

.article-category {
    display: inline-block;
    background: var(--primary-gradient);
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.article-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
    line-height: 1.4;
}

.article-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.read-more {
    font-size: 0.875rem;
    color: var(--primary-light);
    font-weight: 500;
}

.articles-cta {
    text-align: center;
    margin-top: var(--spacing-xl);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-full);
    color: var(--text-primary);
    font-weight: 500;
    transition: all var(--transition-fast);
}

.btn-secondary:hover {
    background: var(--bg-card-hover);
    border-color: var(--primary-color);
    color: var(--text-primary);
}

/* ============================================
   FAQ Section
   ============================================ */
.faq-section {
    padding: var(--spacing-2xl) 0;
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.faq-item {
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1rem;
    font-weight: 500;
    text-align: left;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.faq-question:hover {
    background: var(--bg-card-hover);
}

.faq-icon {
    font-size: 1.25rem;
}

.faq-toggle {
    margin-left: auto;
    font-size: 1.5rem;
    color: var(--text-muted);
    transition: transform var(--transition-fast);
}

.faq-item.active .faq-toggle {
    transform: rotate(45deg);
}

.faq-answer {
    display: none;
    padding: 0 var(--spacing-md) var(--spacing-md);
    color: var(--text-secondary);
    line-height: 1.7;
}

.faq-item.active .faq-answer {
    display: block;
}

.faq-answer code {
    background: var(--bg-darker);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 0.875em;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: var(--bg-darker);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.footer-brand p {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-md);
}

.footer-social {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.875rem;
    color: var(--text-muted);
}

.footer-social a {
    font-size: 1.25rem;
    transition: transform var(--transition-fast);
}

.footer-social a:hover {
    transform: scale(1.2);
}

.footer-links h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.footer-links ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.footer-links a:hover {
    color: var(--text-primary);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.875rem;
}

.footer-ref {
    margin-top: var(--spacing-xs);
    font-size: 0.8rem;
}

.footer-ref a {
    color: var(--text-muted);
}

/* ============================================
   Animations
   ============================================ */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
        transform: scale(1);
    }

    50% {
        opacity: 0.5;
        transform: scale(1.1);
    }
}

@keyframes float {

    0%,
    100% {
        transform: translate(0, 0);
    }

    25% {
        transform: translate(10px, 10px);
    }

    50% {
        transform: translate(-5px, 15px);
    }

    75% {
        transform: translate(-10px, 5px);
    }
}

/* ============================================
   Toast Notification
   ============================================ */
.toast {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-full);
    color: var(--text-primary);
    font-size: 0.875rem;
    backdrop-filter: blur(10px);
    z-index: 10000;
    opacity: 0;
    transition: all var(--transition-normal);
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.toast.success {
    border-color: #22c55e;
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
    .info-grid {
        grid-template-columns: 1fr;
    }

    .info-sidebar {
        position: static;
    }

    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .hero {
        padding: 120px 0 60px;
    }

    .hero-stats {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-sm);
    }

    .stat-item {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }

    .live-time-card {
        flex-direction: column;
        text-align: center;
    }

    .converter-grid {
        grid-template-columns: 1fr;
    }

    .options-row,
    .datetime-inputs {
        grid-template-columns: 1fr;
    }

    .steps-grid {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .reference-table th,
    .reference-table td {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 0.75rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }

    .hero-title {
        font-size: 2rem;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .articles-grid {
        grid-template-columns: 1fr;
    }

    .tools-grid {
        grid-template-columns: 1fr;
    }
}

/* Reduce motion for accessibility */
@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}