/* === Variables === */
:root {
    --primary: #6366f1;
    --primary-light: #818cf8;
    --accent: #22c55e;
    --accent-orange: #f97316;
    --bg-dark: #0a0a0f;
    --bg-card: #111118;
    --bg-card-hover: #1a1a24;
    --text-primary: #ffffff;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    --border: #1f2937;
    --gradient-1: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #d946ef 100%);
    --gradient-2: linear-gradient(135deg, #22c55e 0%, #10b981 100%);
    --gradient-3: linear-gradient(135deg, #f97316 0%, #eab308 100%);
    --glow-primary: 0 0 40px rgba(99, 102, 241, 0.3);
    --glow-accent: 0 0 40px rgba(34, 197, 94, 0.3);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* === Language Toggle === */
.lang-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1001;
    display: flex;
    gap: 4px;
    background: rgba(17, 17, 24, 0.9);
    backdrop-filter: blur(10px);
    padding: 4px;
    border-radius: 8px;
    border: 1px solid var(--border);
}

.lang-btn {
    padding: 8px 16px;
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.3s;
}

.lang-btn.active {
    background: var(--primary);
    color: white;
}

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

/* === Navigation === */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text-primary);
}

.logo-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-3);
    border-radius: 10px;
    font-size: 20px;
    font-weight: 700;
}

.logo-text {
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 700;
    font-size: 22px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 15px;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: var(--primary-light);
}

/* === Hero Section === */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 0 80px;
    position: relative;
    overflow: hidden;
}

.hero-particles {
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(99, 102, 241, 0.15), transparent),
        radial-gradient(ellipse 50% 30% at 20% 80%, rgba(34, 197, 94, 0.1), transparent),
        radial-gradient(ellipse 40% 40% at 80% 60%, rgba(249, 115, 22, 0.1), transparent);
}

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

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: rgba(34, 197, 94, 0.1);
    border: 1px solid rgba(34, 197, 94, 0.3);
    border-radius: 50px;
    font-size: 14px;
    font-weight: 500;
    color: var(--accent);
    margin-bottom: 32px;
}

.pulse-dot {
    width: 8px;
    height: 8px;
    background: var(--accent);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(0.8); }
}

.hero-title {
    font-family: 'Space Grotesk', sans-serif;
    font-size: clamp(40px, 8vw, 72px);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 24px;
}

.gradient-text {
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 40px;
    line-height: 1.8;
}

.hero-cta {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-bottom: 64px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 16px 32px;
    font-size: 15px;
    font-weight: 600;
    text-decoration: none;
    border-radius: 12px;
    transition: all 0.3s;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--gradient-1);
    color: white;
    box-shadow: var(--glow-primary);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 60px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

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

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 64px;
    flex-wrap: wrap;
}

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

.stat-number {
    display: block;
    font-family: 'Space Grotesk', sans-serif;
    font-size: 40px;
    font-weight: 700;
    background: var(--gradient-3);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 14px;
    color: var(--text-muted);
}

/* === Sections === */
.section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-tag {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: 50px;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 1px;
    color: var(--primary-light);
    margin-bottom: 16px;
}

.section-header h2 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: clamp(32px, 5vw, 48px);
    margin-bottom: 16px;
}

.section-header p {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* === Exchange Grid === */
.exchanges {
    background: linear-gradient(180deg, var(--bg-dark) 0%, #0d0d14 100%);
}

.exchange-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 24px;
}

.exchange-card {
    display: flex;
    flex-direction: column;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 24px;
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.exchange-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-1);
    opacity: 0;
    transition: opacity 0.3s;
}

.exchange-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

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

.exchange-card[data-tier="tier1"]::before {
    background: var(--gradient-3);
}

.exchange-card.special {
    border-color: rgba(139, 92, 246, 0.3);
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.05) 0%, var(--bg-card) 100%);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
}

.exchange-logo {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    font-weight: 700;
    font-size: 18px;
}

.exchange-logo.binance { background: linear-gradient(135deg, #F3BA2F, #FCD535); color: #1E2026; }
.exchange-logo.okx { background: linear-gradient(135deg, #121212, #2a2a2a); color: white; border: 1px solid #333; }
.exchange-logo.gate { background: linear-gradient(135deg, #17E6A1, #00D4AA); color: #1a1a1a; }
.exchange-logo.bybit { background: linear-gradient(135deg, #F7A600, #FFD93D); color: #1a1a1a; }
.exchange-logo.bitget { background: linear-gradient(135deg, #00F0FF, #00D4E5); color: #1a1a1a; }
.exchange-logo.htx { background: linear-gradient(135deg, #2354E6, #3B82F6); color: white; }
.exchange-logo.kucoin { background: linear-gradient(135deg, #23AF91, #3DD598); color: white; }
.exchange-logo.mexc { background: linear-gradient(135deg, #1972F5, #2389FF); color: white; }
.exchange-logo.xt { background: linear-gradient(135deg, #2B6BF7, #5B8DEF); color: white; }
.exchange-logo.bitmart { background: linear-gradient(135deg, #00C4A1, #00E5BD); color: #1a1a1a; }
.exchange-logo.weex { background: linear-gradient(135deg, #6366F1, #8B5CF6); color: white; }
.exchange-logo.axiom { background: linear-gradient(135deg, #9945FF, #14F195); color: white; }

.exchange-info h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 2px;
}

.exchange-tagline {
    font-size: 13px;
    color: var(--text-muted);
}

.rebate-badge {
    margin-left: auto;
    padding: 6px 12px;
    background: rgba(34, 197, 94, 0.1);
    border: 1px solid rgba(34, 197, 94, 0.3);
    border-radius: 8px;
    font-size: 14px;
    font-weight: 700;
    color: var(--accent);
}

.rebate-badge.hot {
    background: rgba(249, 115, 22, 0.1);
    border-color: rgba(249, 115, 22, 0.3);
    color: var(--accent-orange);
}

.rebate-badge.special {
    background: rgba(139, 92, 246, 0.1);
    border-color: rgba(139, 92, 246, 0.3);
    color: #a78bfa;
}

.card-body {
    flex: 1;
    margin-bottom: 16px;
}

.card-body p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.6;
}

.card-features {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.card-features span {
    padding: 4px 10px;
    background: rgba(99, 102, 241, 0.1);
    border-radius: 6px;
    font-size: 12px;
    color: var(--primary-light);
}

.card-footer {
    padding-top: 16px;
    border-top: 1px solid var(--border);
}

.register-text {
    font-size: 14px;
    font-weight: 600;
    color: var(--primary-light);
    transition: color 0.3s;
}

.exchange-card:hover .register-text {
    color: var(--accent);
}

/* === Learn Section === */
.learn {
    background: var(--bg-card);
}

.learn-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 24px;
}

.learn-card {
    background: var(--bg-dark);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 32px;
    transition: all 0.3s;
}

.learn-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
}

.learn-icon {
    font-size: 40px;
    margin-bottom: 16px;
}

.learn-card h3 {
    font-size: 18px;
    margin-bottom: 12px;
}

.learn-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* === Guide Section === */
.steps {
    max-width: 700px;
    margin: 0 auto 48px;
}

.step {
    display: flex;
    gap: 24px;
    padding: 32px 0;
    border-bottom: 1px solid var(--border);
}

.step:last-child {
    border-bottom: none;
}

.step-number {
    width: 48px;
    height: 48px;
    background: var(--gradient-1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 700;
    font-size: 20px;
    flex-shrink: 0;
}

.step-content h3 {
    font-size: 18px;
    margin-bottom: 8px;
}

.step-content p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
}

.tips-box {
    background: rgba(34, 197, 94, 0.05);
    border: 1px solid rgba(34, 197, 94, 0.2);
    border-radius: 16px;
    padding: 32px;
    max-width: 700px;
    margin: 0 auto;
}

.tips-box h4 {
    font-size: 18px;
    margin-bottom: 16px;
    color: var(--accent);
}

.tips-box ul {
    list-style: none;
}

.tips-box li {
    position: relative;
    padding-left: 24px;
    margin-bottom: 12px;
    font-size: 14px;
    color: var(--text-secondary);
}

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

/* === FAQ Section === */
.faq {
    background: linear-gradient(180deg, var(--bg-dark) 0%, #0d0d14 100%);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid var(--border);
    padding: 24px 0;
}

.faq-question {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.faq-question::after {
    content: '+';
    font-size: 24px;
    color: var(--primary);
    transition: transform 0.3s;
}

.faq-item.open .faq-question::after {
    transform: rotate(45deg);
}

.faq-answer {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-item.open .faq-answer {
    max-height: 200px;
}

/* === Footer === */
.footer {
    padding: 64px 0 32px;
    border-top: 1px solid var(--border);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 48px;
    flex-wrap: wrap;
    gap: 40px;
}

.footer-brand .logo {
    margin-bottom: 12px;
}

.footer-brand p {
    font-size: 14px;
    color: var(--text-muted);
}

.footer-links {
    display: flex;
    gap: 64px;
}

.link-group h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 16px;
}

.link-group a {
    display: block;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    margin-bottom: 8px;
    transition: color 0.3s;
}

.link-group a:hover {
    color: var(--primary-light);
}

.footer-bottom {
    text-align: center;
    padding-top: 32px;
    border-top: 1px solid var(--border);
}

.footer-bottom p {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.disclaimer {
    font-size: 12px !important;
}

/* === Responsive === */
@media (max-width: 968px) {
    .nav-links {
        display: none;
    }
    
    .hero-stats {
        gap: 32px;
    }
    
    .exchange-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .footer-links {
        gap: 40px;
    }
}

@media (max-width: 640px) {
    .container {
        padding: 0 16px;
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: stretch;
    }
    
    .btn {
        justify-content: center;
    }
    
    .learn-grid {
        grid-template-columns: 1fr;
    }
    
    .step {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .lang-toggle {
        top: auto;
        bottom: 20px;
        right: 20px;
    }
}