/* ============================================
   Global Styles & Variables
   ============================================ */
:root {
    --primary-dark: #0f1419;
    --primary-darker: #0a0e13;
    --secondary-dark: #1a1f2e;
    --accent-purple: #6366f1;
    --accent-blue: #3b82f6;
    --accent-cyan: #06b6d4;
    --accent-indigo: #8b5cf6;
    --text-light: #e5e7eb;
    --text-muted: #9ca3af;
    --border-color: rgba(255, 255, 255, 0.08);
    --glow-purple: rgba(99, 102, 241, 0.2);
    --glow-blue: rgba(59, 130, 246, 0.2);
    --transition: all 0.3s cubic-bezier(0.23, 1, 0.32, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Poppins', sans-serif;
    background: linear-gradient(135deg, var(--primary-darker) 0%, var(--primary-dark) 50%, var(--secondary-dark) 100%);
    color: var(--text-light);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Background grid effect */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image:
        linear-gradient(rgba(99, 102, 241, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99, 102, 241, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    pointer-events: none;
    z-index: 1;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    position: relative;
    z-index: 2;
}

/* ============================================
   Header
   ============================================ */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(15, 20, 25, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

.header.scrolled {
    background: rgba(15, 20, 25, 0.95);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    transition: var(--transition);
}

.logo:hover {
    transform: translateY(-2px);
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--accent-purple) 0%, var(--accent-indigo) 100%);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    box-shadow: 0 0 20px var(--glow-purple);
}

.logo-text {
    font-family: 'Playfair Display', serif;
    font-size: 20px;
    font-weight: 700;
    background: linear-gradient(135deg, #fff 0%, var(--accent-cyan) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.lang-toggle {
    display: flex;
    gap: 8px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 4px;
}

.lang-btn {
    padding: 8px 16px;
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    border-radius: 6px;
    transition: var(--transition);
}

.lang-btn.active {
    background: linear-gradient(135deg, var(--accent-purple) 0%, var(--accent-indigo) 100%);
    color: white;
    box-shadow: 0 0 15px var(--glow-purple);
}

.lang-btn:hover:not(.active) {
    color: var(--text-light);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    padding: 80px 0 60px;
    text-align: center;
}

.hero-content {
    margin-bottom: 60px;
    animation: fadeInUp 0.8s ease-out;
}

.hero-badge {
    display: inline-block;
    padding: 10px 20px;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: 20px;
    margin-bottom: 24px;
}

.badge-text {
    font-size: 12px;
    font-weight: 600;
    background: linear-gradient(135deg, var(--accent-purple) 0%, var(--accent-cyan) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-title {
    font-family: 'Playfair Display', serif;
    font-size: clamp(2.5rem, 8vw, 4rem);
    font-weight: 800;
    margin-bottom: 16px;
    background: linear-gradient(135deg, #fff 0%, var(--accent-cyan) 50%, var(--accent-purple) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 600;
    background: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-blue) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 16px;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto 32px;
    line-height: 1.8;
}

.cta-button {
    padding: 14px 48px;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--accent-purple) 0%, var(--accent-indigo) 100%);
    color: white;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 10px 30px var(--glow-purple);
    position: relative;
    overflow: hidden;
}

.cta-button::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;
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 40px var(--glow-purple);
}

.cta-button:hover::before {
    left: 100%;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-top: 60px;
}

.stat-card {
    padding: 24px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    text-align: center;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.stat-card:hover {
    border-color: rgba(99, 102, 241, 0.3);
    background: rgba(99, 102, 241, 0.05);
    box-shadow: 0 10px 30px var(--glow-purple);
    transform: translateY(-5px);
}

.stat-value {
    font-family: 'Playfair Display', serif;
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-purple) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* ============================================
   Features Section
   ============================================ */
.features {
    padding: 80px 0;
    background: linear-gradient(180deg, transparent 0%, rgba(99, 102, 241, 0.05) 50%, transparent 100%);
}

.section-title {
    font-family: 'Playfair Display', serif;
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: 60px;
    background: linear-gradient(135deg, #fff 0%, var(--accent-cyan) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 24px;
}

.feature-card {
    padding: 32px 24px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    text-align: center;
    transition: var(--transition);
    backdrop-filter: blur(10px);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.feature-card:hover {
    border-color: rgba(99, 102, 241, 0.3);
    background: rgba(99, 102, 241, 0.05);
    box-shadow: 0 15px 40px var(--glow-purple);
    transform: translateY(-8px);
}

.feature-icon {
    width: 64px;
    height: 64px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    margin-bottom: 16px;
    box-shadow: 0 0 20px rgba(99, 102, 241, 0.3);
}

.feature-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-light);
}

.feature-desc {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.6;
}

/* ============================================
   How It Works Section
   ============================================ */
.how-it-works {
    padding: 80px 0;
}

.steps-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
    margin-top: 60px;
}

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.step-number {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-purple) 0%, var(--accent-indigo) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Playfair Display', serif;
    font-size: 28px;
    font-weight: 700;
    color: white;
    box-shadow: 0 0 20px var(--glow-purple);
    transition: var(--transition);
}

.step:hover .step-number {
    transform: scale(1.1);
    box-shadow: 0 0 30px var(--glow-purple);
}

.step-title {
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    max-width: 120px;
}

.step-arrow {
    font-size: 24px;
    color: var(--accent-purple);
    font-weight: 700;
}

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

/* ============================================
   Comparison Section
   ============================================ */
.comparison {
    padding: 80px 0;
    background: linear-gradient(180deg, transparent 0%, rgba(99, 102, 241, 0.05) 50%, transparent 100%);
}

.table-wrapper {
    overflow-x: auto;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.02);
    backdrop-filter: blur(10px);
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    min-width: 500px;
}

.comparison-table th,
.comparison-table td {
    padding: 20px 24px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.comparison-table th {
    background: rgba(99, 102, 241, 0.1);
    font-weight: 600;
    font-size: 0.95rem;
}

.comparison-table th.highlight {
    background: rgba(99, 102, 241, 0.2);
    color: var(--accent-cyan);
}

.comparison-table td.highlight {
    color: var(--accent-cyan);
    font-weight: 600;
    background: rgba(99, 102, 241, 0.05);
}

.comparison-table tbody tr:hover {
    background: rgba(99, 102, 241, 0.05);
}

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

/* ============================================
   Benefits Section
   ============================================ */
.benefits {
    padding: 80px 0;
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
    margin-top: 60px;
}

.benefit-card {
    padding: 40px 32px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    transition: var(--transition);
    backdrop-filter: blur(10px);
    text-align: center;
}

.benefit-card:hover {
    border-color: rgba(99, 102, 241, 0.3);
    background: rgba(99, 102, 241, 0.05);
    box-shadow: 0 15px 40px var(--glow-purple);
    transform: translateY(-8px);
}

.benefit-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.benefit-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-light);
}

.benefit-desc {
    font-size: 0.95rem;
    color: var(--text-muted);
    line-height: 1.7;
}

/* ============================================
   CTA Section
   ============================================ */
.cta-section {
    padding: 80px 0;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    text-align: center;
}

.cta-title {
    font-family: 'Playfair Display', serif;
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    margin-bottom: 16px;
    background: linear-gradient(135deg, #fff 0%, var(--accent-cyan) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.cta-subtitle {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: 32px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.cta-button-large {
    padding: 16px 56px;
    font-size: 1.1rem;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    padding: 32px 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
    background: rgba(15, 20, 25, 0.5);
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ============================================
   Language Toggle
   ============================================ */
[data-lang="en"] .zh {
    display: none !important;
}

[data-lang="zh"] .en {
    display: none !important;
}

/* ============================================
   Animations
   ============================================ */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes glow {
    0%, 100% {
        box-shadow: 0 0 20px var(--glow-purple);
    }
    50% {
        box-shadow: 0 0 40px var(--glow-purple);
    }
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }

    .hero {
        padding: 60px 0 40px;
    }

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

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

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

    .comparison-table th,
    .comparison-table td {
        padding: 16px 12px;
        font-size: 0.85rem;
    }

    .steps-container {
        flex-direction: column;
        gap: 40px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.8rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

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

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