/* ============================================
   Gate.io 下载注册转化页样式
   深色背景 + 蓝绿色科技感
   ============================================ */

/* CSS Variables */
:root {
    --bg-primary: #071014;
    --bg-secondary: #0E1A20;
    --bg-card: #13242B;
    --bg-card-hover: #1A2F38;
    --text-primary: #FFFFFF;
    --text-secondary: #9FB3C8;
    --border: #24434D;
    --border-hover: #356575;
    --accent: #00E0B8;
    --accent-secondary: #1FA2FF;
    --btn-text: #02110F;
    --up: #00C087;
    --down: #FF4D4F;
    --gradient: linear-gradient(135deg, #00E0B8, #1FA2FF);
    --shadow: 0 4px 24px rgba(0, 224, 184, 0.08);
    --radius: 12px;
    --radius-lg: 16px;
    --transition: all 0.3s ease;
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; }
button { border: none; background: none; cursor: pointer; font-family: inherit; }
img { max-width: 100%; display: block; }

/* Container */
.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* Buttons */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 10px 24px; border-radius: 8px; font-size: 14px; font-weight: 600;
    transition: var(--transition); white-space: nowrap;
}
.btn-primary {
    background: var(--accent); color: var(--btn-text);
}
.btn-primary:hover { background: #00f0c8; transform: translateY(-1px); box-shadow: 0 4px 20px rgba(0, 224, 184, 0.3); }
.btn-outline {
    background: transparent; color: var(--text-primary); border: 1px solid var(--border);
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }
.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(--accent); }
.btn-large { padding: 14px 32px; font-size: 15px; border-radius: 10px; }
.btn-copy {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 8px 16px; background: var(--bg-card); border: 1px solid var(--border);
    border-radius: 8px; color: var(--text-secondary); font-size: 13px; cursor: pointer;
    transition: var(--transition);
}
.btn-copy:hover { border-color: var(--accent); color: var(--accent); }

/* Section Header */
.section-header { margin-bottom: 48px; }
.section-header.center { text-align: center; }
.section-header h2 { font-size: 32px; font-weight: 700; margin-bottom: 12px; }
.section-header .section-subtitle { color: var(--text-secondary); font-size: 16px; max-width: 640px; margin: 0 auto; }
.section-note { text-align: center; color: var(--text-secondary); font-size: 13px; margin-top: 24px; }

/* Header */
.header {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    background: rgba(7, 16, 20, 0.85); backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(36, 67, 77, 0.5);
}
.header-inner {
    display: flex; align-items: center; justify-content: space-between; height: 64px;
}
.logo {
    font-size: 18px; font-weight: 700; color: var(--text-primary);
    background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.nav { display: flex; gap: 28px; }
.nav a { font-size: 14px; color: var(--text-secondary); transition: var(--transition); }
.nav a:hover { color: var(--accent); }
.header-actions { display: flex; gap: 12px; }
.menu-toggle { display: none; flex-direction: column; gap: 5px; padding: 8px; }
.menu-toggle span { display: block; width: 22px; height: 2px; background: var(--text-primary); border-radius: 2px; transition: var(--transition); }
.menu-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.menu-toggle.active span:nth-child(2) { opacity: 0; }
.menu-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* Hero */
.hero { padding: 140px 0 80px; background: radial-gradient(ellipse at 70% 20%, rgba(0, 224, 184, 0.08) 0%, transparent 50%); }
.hero-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.hero-content h1 { font-size: 48px; font-weight: 800; line-height: 1.15; margin-bottom: 20px; }
.hero-subtitle { font-size: 16px; color: var(--text-secondary); margin-bottom: 28px; max-width: 540px; }
.referral-box {
    display: inline-flex; align-items: center; gap: 12px;
    background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
    padding: 12px 20px; margin-bottom: 28px;
}
.referral-label { font-size: 13px; color: var(--text-secondary); }
.referral-code { font-size: 20px; font-weight: 700; color: var(--accent); font-family: monospace; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 28px; }
.hero-trust { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 20px; }
.trust-tag { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; color: var(--text-secondary); }
.trust-tag .dot { width: 6px; height: 6px; background: var(--accent); border-radius: 50%; }
.risk-note { font-size: 12px; color: var(--text-secondary); opacity: 0.7; max-width: 520px; }

/* Phone Mockup */
.phone-mockup {
    width: 280px; height: 560px; background: var(--bg-secondary);
    border: 2px solid var(--border); border-radius: 36px; padding: 12px;
    box-shadow: var(--shadow), 0 0 60px rgba(0, 224, 184, 0.1); margin: 0 auto;
}
.phone-mockup.large { width: 300px; height: 600px; }
.phone-screen { width: 100%; height: 100%; background: var(--bg-card); border-radius: 26px; overflow: hidden; display: flex; flex-direction: column; }
.phone-header { display: flex; align-items: center; justify-content: center; padding: 16px 0 8px; position: relative; }
.phone-dots { display: flex; gap: 6px; position: absolute; left: 20px; }
.phone-dots span { width: 6px; height: 6px; background: var(--border); border-radius: 50%; }
.phone-title { font-size: 12px; font-weight: 600; color: var(--text-secondary); }
.phone-body { flex: 1; padding: 16px; }
.phone-price { text-align: center; margin-bottom: 16px; }
.price-label { display: block; font-size: 11px; color: var(--text-secondary); margin-bottom: 4px; }
.price-value { display: block; font-size: 28px; font-weight: 700; }
.price-change { font-size: 13px; font-weight: 600; }
.phone-chart { height: 50px; margin-bottom: 16px; }
.phone-chart svg { width: 100%; height: 100%; }
.phone-list { display: flex; flex-direction: column; gap: 8px; }
.phone-item { display: flex; justify-content: space-between; font-size: 13px; padding: 8px 12px; background: rgba(0, 224, 184, 0.05); border-radius: 8px; }
.phone-menu { display: flex; justify-content: space-around; margin-bottom: 16px; }
.menu-item { font-size: 11px; color: var(--text-secondary); padding: 4px 8px; border-radius: 6px; }
.menu-item.active { background: rgba(0, 224, 184, 0.15); color: var(--accent); }
.phone-assets { display: flex; flex-direction: column; gap: 6px; }
.asset-row { display: flex; justify-content: space-between; font-size: 12px; padding: 8px 10px; background: rgba(255,255,255,0.03); border-radius: 6px; }

/* Trust Bar */
.trust-bar { padding: 40px 0; background: var(--bg-secondary); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.trust-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.trust-card { text-align: center; padding: 20px; }
.trust-icon { margin-bottom: 12px; }
.trust-card h3 { font-size: 15px; font-weight: 600; margin-bottom: 6px; }
.trust-card p { font-size: 13px; color: var(--text-secondary); }

/* Market Section */
.market-section { padding: 80px 0; }
.tab-switch { display: inline-flex; gap: 4px; background: var(--bg-card); padding: 4px; border-radius: 10px; margin-top: 16px; }
.tab-btn { padding: 8px 20px; border-radius: 8px; font-size: 14px; color: var(--text-secondary); transition: var(--transition); }
.tab-btn.active { background: var(--accent); color: var(--btn-text); font-weight: 600; }
.tab-content { display: none; }
.tab-content.active { display: block; animation: fadeIn 0.3s ease; }
.coin-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 24px; }
.coin-card {
    background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
    padding: 20px; transition: var(--transition); position: relative;
}
.coin-card:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: var(--shadow); }
.coin-info { display: flex; flex-direction: column; gap: 4px; margin-bottom: 12px; }
.coin-name { font-size: 15px; font-weight: 600; }
.coin-pair { color: var(--text-secondary); font-weight: 400; }
.coin-price { font-size: 18px; font-weight: 700; }
.coin-change { display: inline-block; font-size: 14px; font-weight: 600; padding: 4px 10px; border-radius: 6px; margin-bottom: 12px; }
.coin-change.up { color: var(--up); background: rgba(0, 192, 135, 0.1); }
.coin-change.down { color: var(--down); background: rgba(255, 77, 79, 0.1); }
.coin-link { font-size: 13px; color: var(--accent); }
.coin-link:hover { text-decoration: underline; }
.new-badge { position: absolute; top: 12px; right: 12px; font-size: 11px; background: var(--gradient); color: var(--btn-text); padding: 3px 8px; border-radius: 4px; font-weight: 600; }

/* Referral Section */
.referral-section { padding: 80px 0; background: var(--bg-secondary); }
.referral-main { display: flex; flex-direction: column; gap: 32px; }
.referral-card.primary {
    text-align: center; background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 40px;
}
.referral-card.primary .referral-label { display: block; font-size: 14px; color: var(--text-secondary); margin-bottom: 8px; }
.referral-code-large { display: block; font-size: 42px; font-weight: 800; color: var(--accent); font-family: monospace; letter-spacing: 2px; margin-bottom: 16px; }
.referral-desc { font-size: 14px; color: var(--text-secondary); margin-bottom: 8px; }
.referral-actions { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.referral-action-card {
    background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
    padding: 28px; text-align: center; cursor: pointer; transition: var(--transition);
}
.referral-action-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.action-icon { margin-bottom: 12px; color: var(--accent); }
.referral-action-card h4 { font-size: 15px; font-weight: 600; margin-bottom: 8px; }
.action-code { display: block; font-size: 20px; font-weight: 700; color: var(--accent); font-family: monospace; margin-bottom: 12px; }
.action-desc { display: block; font-size: 13px; color: var(--text-secondary); margin-bottom: 12px; }
.action-btn { display: inline-block; padding: 8px 20px; background: var(--accent); color: var(--btn-text); border-radius: 8px; font-size: 13px; font-weight: 600; }

/* Why Section */
.why-section { padding: 80px 0; }
.why-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.why-card {
    background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
    padding: 32px; transition: var(--transition);
}
.why-card:hover { border-color: var(--accent); }
.why-icon { margin-bottom: 16px; }
.why-card h3 { font-size: 17px; font-weight: 600; margin-bottom: 10px; }
.why-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.7; }

/* Discovery Section */
.discovery-section { padding: 80px 0; background: var(--bg-secondary); }
.discovery-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-bottom: 32px; }
.discovery-card {
    background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
    padding: 28px; transition: var(--transition);
}
.discovery-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.discovery-icon { margin-bottom: 16px; }
.discovery-card h3 { font-size: 16px; font-weight: 600; margin-bottom: 10px; }
.discovery-card p { font-size: 13px; color: var(--text-secondary); line-height: 1.7; }
.discovery-actions { display: flex; justify-content: center; gap: 16px; margin-bottom: 24px; }
.risk-banner {
    display: flex; align-items: flex-start; gap: 12px;
    background: rgba(255, 193, 7, 0.08); border: 1px solid rgba(255, 193, 7, 0.2);
    border-radius: var(--radius); padding: 16px 20px; color: #FFC107;
}
.risk-banner p { font-size: 13px; line-height: 1.6; }

/* Steps Section */
.steps-section { padding: 80px 0; }
.steps-grid { display: flex; align-items: stretch; gap: 0; margin-bottom: 32px; }
.step-card {
    flex: 1; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
    padding: 36px 28px; text-align: center; position: relative;
}
.step-number {
    display: inline-flex; align-items: center; justify-content: center;
    width: 48px; height: 48px; background: var(--gradient);
    color: var(--btn-text); font-size: 20px; font-weight: 700;
    border-radius: 50%; margin-bottom: 16px;
}
.step-card h3 { font-size: 17px; font-weight: 600; margin-bottom: 10px; }
.step-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.7; }
.step-connector { width: 40px; display: flex; align-items: center; justify-content: center; }
.step-connector::after { content: ''; width: 100%; height: 2px; background: var(--gradient); }
.steps-cta { text-align: center; }

/* App Section */
.app-section { padding: 80px 0; background: var(--bg-secondary); }
.app-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.app-content h2 { font-size: 32px; font-weight: 700; margin-bottom: 16px; }
.app-content p { font-size: 15px; color: var(--text-secondary); margin-bottom: 28px; line-height: 1.8; }
.app-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 32px; }
.app-tag { padding: 6px 14px; background: rgba(0, 224, 184, 0.08); border: 1px solid rgba(0, 224, 184, 0.2); border-radius: 20px; font-size: 13px; color: var(--accent); }
.app-buttons { display: flex; flex-wrap: wrap; gap: 12px; }

/* Guide Section */
.guide-section { padding: 80px 0; }
.guide-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.guide-card {
    background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
    padding: 24px; transition: var(--transition); display: flex; flex-direction: column;
}
.guide-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.guide-card h3 { font-size: 15px; font-weight: 600; margin-bottom: 8px; line-height: 1.4; }
.guide-card p { font-size: 13px; color: var(--text-secondary); margin-bottom: 16px; flex: 1; }
.guide-meta { font-size: 12px; color: var(--accent); }

/* Trading Section */
.trading-section { padding: 80px 0; background: var(--bg-secondary); }
.trading-table-wrap { overflow-x: auto; margin-bottom: 24px; }
.trading-table { width: 100%; border-collapse: collapse; }
.trading-table th, .trading-table td { padding: 16px 20px; text-align: left; border-bottom: 1px solid var(--border); }
.trading-table th { font-size: 13px; font-weight: 600; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 0.5px; }
.trading-table td { font-size: 14px; }
.feature-tag { display: inline-block; padding: 4px 12px; background: rgba(0, 224, 184, 0.1); border: 1px solid rgba(0, 224, 184, 0.2); border-radius: 6px; font-size: 13px; font-weight: 600; color: var(--accent); }

/* Security Section */
.security-section { padding: 80px 0; }
.security-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-bottom: 32px; }
.security-card {
    background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
    padding: 28px; transition: var(--transition);
}
.security-card:hover { border-color: var(--accent); }
.security-icon { margin-bottom: 16px; }
.security-card h3 { font-size: 15px; font-weight: 600; margin-bottom: 8px; }
.security-card p { font-size: 13px; color: var(--text-secondary); line-height: 1.7; }
.security-cta { text-align: center; }

/* Fees Section */
.fees-section { padding: 80px 0; background: var(--bg-secondary); }
.fees-table-wrap { max-width: 640px; margin: 0 auto 32px; }
.fees-table { width: 100%; border-collapse: collapse; }
.fees-table td { padding: 16px 20px; border-bottom: 1px solid var(--border); font-size: 15px; }
.fees-table td:first-child { color: var(--text-secondary); width: 120px; }
.code-highlight { font-family: monospace; font-size: 18px; font-weight: 700; color: var(--accent); background: rgba(0, 224, 184, 0.08); padding: 4px 12px; border-radius: 6px; }
.fees-actions { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; }

/* FAQ Section */
.faq-section { padding: 80px 0; }
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item { border-bottom: 1px solid var(--border); }
.faq-question {
    display: flex; justify-content: space-between; align-items: center;
    width: 100%; padding: 20px 0; font-size: 15px; font-weight: 500;
    color: var(--text-primary); text-align: left;
}
.faq-question:hover { color: var(--accent); }
.faq-icon { font-size: 20px; color: var(--text-secondary); transition: var(--transition); }
.faq-item.active .faq-icon { transform: rotate(45deg); color: var(--accent); }
.faq-answer {
    max-height: 0; overflow: hidden; transition: max-height 0.3s ease, padding 0.3s ease;
    color: var(--text-secondary); font-size: 14px; line-height: 1.7;
}
.faq-item.active .faq-answer { max-height: 300px; padding-bottom: 20px; }

/* Final CTA */
.final-cta { padding: 100px 0; background: radial-gradient(ellipse at center, rgba(0, 224, 184, 0.1) 0%, transparent 70%); }
.cta-inner { text-align: center; }
.cta-inner h2 { font-size: 36px; font-weight: 700; margin-bottom: 12px; }
.cta-inner p { font-size: 16px; color: var(--text-secondary); margin-bottom: 32px; }
.cta-actions { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; }

/* Friendship Links */
.friendship-links { padding: 40px 0; background: var(--bg-primary); border-top: 1px solid var(--border); }
.friendship-inner { text-align: center; }
.friendship-inner h3 { font-size: 14px; font-weight: 600; color: var(--text-secondary); margin-bottom: 20px; letter-spacing: 1px; text-transform: uppercase; }
.friendship-list { display: flex; justify-content: center; flex-wrap: wrap; gap: 12px 24px; }
.friendship-list a { font-size: 13px; color: var(--text-secondary); transition: var(--transition); }
.friendship-list a:hover { color: var(--accent); }

/* Footer */
.footer { padding: 60px 0 32px; background: var(--bg-secondary); border-top: 1px solid var(--border); }
.footer-links { display: flex; justify-content: center; gap: 28px; margin-bottom: 32px; flex-wrap: wrap; }
.footer-links a { font-size: 14px; color: var(--text-secondary); transition: var(--transition); }
.footer-links a:hover { color: var(--accent); }
.footer-disclaimer { text-align: center; max-width: 800px; margin: 0 auto 32px; }
.footer-disclaimer p { font-size: 12px; color: var(--text-secondary); opacity: 0.7; line-height: 1.8; }
.footer-bottom { display: flex; justify-content: space-between; align-items: center; padding-top: 24px; border-top: 1px solid var(--border); font-size: 13px; color: var(--text-secondary); }

/* Floating Bar */
.floating-bar {
    position: fixed; bottom: 0; left: 0; right: 0; z-index: 999;
    display: flex; align-items: center; justify-content: center; gap: 12px;
    background: rgba(7, 16, 20, 0.95); backdrop-filter: blur(20px);
    border-top: 1px solid var(--border); padding: 12px 24px;
    transform: translateY(100%); transition: transform 0.3s ease;
}
.floating-bar.visible { transform: translateY(0); }

/* Toast */
.toast {
    position: fixed; bottom: 100px; left: 50%; transform: translateX(-50%) translateY(20px);
    background: var(--bg-card); border: 1px solid var(--accent); color: var(--accent);
    padding: 12px 24px; border-radius: 8px; font-size: 14px; font-weight: 500;
    opacity: 0; pointer-events: none; transition: all 0.3s ease; z-index: 2000;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* Utilities */
.up { color: var(--up); }
.down { color: var(--down); }

@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

/* ============================================
   Responsive - Tablet
   ============================================ */
@media (max-width: 1024px) {
    .hero-inner { grid-template-columns: 1fr; gap: 40px; }
    .hero-visual { order: -1; }
    .app-inner { grid-template-columns: 1fr; gap: 40px; }
    .app-visual { order: -1; }
    .why-grid { grid-template-columns: repeat(2, 1fr); }
    .guide-grid { grid-template-columns: repeat(2, 1fr); }
    .discovery-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ============================================
   Responsive - Mobile
   ============================================ */
@media (max-width: 768px) {
    .container { padding: 0 16px; }
    .nav { display: none; position: absolute; top: 64px; left: 0; right: 0; background: var(--bg-secondary); border-bottom: 1px solid var(--border); flex-direction: column; padding: 16px; gap: 0; }
    .nav.active { display: flex; }
    .nav a { padding: 12px 16px; border-bottom: 1px solid rgba(36, 67, 77, 0.3); }
    .nav a:last-child { border-bottom: none; }
    .header-actions { display: none; }
    .menu-toggle { display: flex; }
    .hero { padding: 100px 0 60px; }
    .hero-content h1 { font-size: 32px; }
    .hero-actions .btn-large { padding: 12px 20px; font-size: 14px; }
    .phone-mockup { width: 220px; height: 440px; }
    .phone-mockup.large { width: 240px; height: 480px; }
    .trust-grid { grid-template-columns: repeat(2, 1fr); }
    .coin-grid { grid-template-columns: 1fr; }
    .referral-actions { grid-template-columns: 1fr; }
    .why-grid { grid-template-columns: 1fr; }
    .steps-grid { flex-direction: column; gap: 16px; }
    .step-connector { width: 100%; height: 30px; }
    .step-connector::after { width: 2px; height: 100%; }
    .discovery-grid { grid-template-columns: 1fr; }
    .guide-grid { grid-template-columns: 1fr; }
    .security-grid { grid-template-columns: repeat(2, 1fr); }
    .trading-table th, .trading-table td { padding: 12px 14px; font-size: 13px; }
    .section-header h2 { font-size: 24px; }
    .cta-inner h2 { font-size: 26px; }
    .footer-links { gap: 16px; }
    .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
    .referral-code-large { font-size: 32px; }
}

@media (max-width: 480px) {
    .hero-content h1 { font-size: 26px; }
    .trust-grid { grid-template-columns: 1fr; }
    .security-grid { grid-template-columns: 1fr; }
    .referral-card.primary { padding: 24px 16px; }
    .fees-table td { padding: 12px 14px; font-size: 14px; }
}