/* ========== 国泰海通 - 深蓝金主题 ========== */
:root {
    --primary: #1A3A6B; --primary-dark: #0F2752; --primary-light: #3366B3;
    --accent: #C8A84E; --accent-light: #E0C878;
    --bg-deep: #050A14; --bg-dark: #0A1228; --bg-card: #0F1A3A; --bg-card-hover: #142248;
    --border: #1A3058; --text-primary: #E5EBF5; --text-secondary: #8AA0C8; --text-muted: #506080;
    --gradient-hero: linear-gradient(135deg, #050A14 0%, #0F1E3A 50%, #0A1228 100%);
    --gradient-card: linear-gradient(180deg, #0F1A3A 0%, #0A1428 100%);
    --gradient-accent: linear-gradient(135deg, #1A3A6B 0%, #C8A84E 100%);
    --gradient-btn: linear-gradient(135deg, #1A3A6B 0%, #3366B3 100%);
    --shadow-card: 0 4px 24px rgba(0,0,0,0.35);
    --radius-sm: 8px; --radius-md: 12px; --radius-lg: 20px; --radius-xl: 28px;
    --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
    --font-mono: 'SF Mono', 'Consolas', monospace;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
* { margin: 0; padding: 0; box-sizing: border-box; } html { scroll-behavior: smooth; }
body { font-family: var(--font-sans); background: var(--bg-deep); color: var(--text-primary); line-height: 1.7; overflow-x: hidden; -webkit-font-smoothing: antialiased; }
.glow-orb { position: fixed; pointer-events: none; z-index: 0; }
.glow-orb::before, .glow-orb::after { content: ''; position: absolute; border-radius: 50%; filter: blur(100px); opacity: 0.06; }
.glow-orb::before { width: 500px; height: 500px; background: #1A3A6B; top: 10vh; left: -200px; }
.glow-orb::after { width: 400px; height: 400px; background: #C8A84E; bottom: 10vh; right: -150px; }

.nav { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; padding: 0 40px; height: 70px; display: flex; align-items: center; justify-content: space-between; transition: var(--transition); }
.nav.scrolled { background: rgba(10,18,40,0.92); backdrop-filter: blur(20px); border-bottom: 1px solid var(--border); box-shadow: 0 4px 30px rgba(0,0,0,0.3); }
.nav-logo { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.nav-logo-icon { width: 38px; height: 38px; background: var(--gradient-accent); border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 16px; font-weight: 900; color: #fff; }
.nav-logo-text { font-size: 18px; font-weight: 700; color: var(--text-primary); letter-spacing: 1px; }
.nav-logo-text span { color: var(--accent); }
.nav-cta { padding: 10px 24px; background: var(--gradient-btn); border: none; border-radius: 50px; color: #fff; font-size: 14px; font-weight: 600; cursor: pointer; transition: var(--transition); }
.nav-cta:hover { transform: translateY(-2px); box-shadow: 0 8px 25px rgba(26,58,107,0.4); }

.hero { position: relative; min-height: 100vh; display: flex; align-items: center; justify-content: center; text-align: center; padding: 120px 40px 80px; overflow: hidden; }
.hero-content { position: relative; z-index: 1; max-width: 800px; }
.hero-badge { display: inline-flex; align-items: center; gap: 8px; padding: 6px 18px; background: rgba(26,58,107,0.1); border: 1px solid rgba(26,58,107,0.25); border-radius: 50px; font-size: 13px; color: var(--primary-light); margin-bottom: 28px; letter-spacing: 2px; }
.hero-badge::before { content: ''; width: 8px; height: 8px; background: var(--primary); border-radius: 50%; animation: pulse 2s infinite; }
@keyframes pulse { 0%,100% { box-shadow: 0 0 0 0 rgba(26,58,107,0.4); } 50% { box-shadow: 0 0 0 12px rgba(26,58,107,0); } }
.hero h1 { font-size: 52px; font-weight: 800; line-height: 1.25; margin-bottom: 20px; letter-spacing: 1px; }
.hero h1 .highlight { background: var(--gradient-accent); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-desc { font-size: 17px; color: var(--text-secondary); margin-bottom: 40px; line-height: 1.8; }
.hero-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn-primary { padding: 14px 40px; background: var(--gradient-btn); border: none; border-radius: 50px; color: #fff; font-size: 16px; font-weight: 600; cursor: pointer; transition: var(--transition); text-decoration: none; display: inline-flex; align-items: center; gap: 8px; }
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 12px 35px rgba(26,58,107,0.45); }
.btn-outline { padding: 14px 40px; background: transparent; border: 1.5px solid var(--border); border-radius: 50px; color: var(--text-primary); font-size: 16px; font-weight: 600; cursor: pointer; transition: var(--transition); text-decoration: none; }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); background: rgba(200,168,78,0.05); }
.hero-stats { display: flex; gap: 48px; justify-content: center; margin-top: 56px; flex-wrap: wrap; }
.hero-stat { text-align: center; }
.hero-stat-num { font-size: 36px; font-weight: 800; color: var(--accent); font-family: var(--font-mono); }
.hero-stat-label { font-size: 13px; color: var(--text-muted); margin-top: 4px; }

.section { padding: 100px 40px; position: relative; z-index: 1; }
.section-header { text-align: center; margin-bottom: 60px; }
.section-label { font-size: 13px; color: var(--accent); letter-spacing: 3px; text-transform: uppercase; margin-bottom: 12px; }
.section-title { font-size: 36px; font-weight: 700; margin-bottom: 14px; }
.section-sub { font-size: 16px; color: var(--text-secondary); max-width: 600px; margin: 0 auto; }
.container { max-width: 1200px; margin: 0 auto; }

.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.feature-card { background: var(--gradient-card); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 36px 28px; transition: var(--transition); position: relative; overflow: hidden; }
.feature-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: var(--gradient-accent); transform: scaleX(0); transition: transform 0.4s ease; }
.feature-card:hover::before { transform: scaleX(1); }
.feature-card:hover { border-color: rgba(200,168,78,0.3); transform: translateY(-4px); box-shadow: 0 8px 40px rgba(0,0,0,0.4); }
.feature-icon { width: 52px; height: 52px; background: rgba(26,58,107,0.1); border-radius: var(--radius-md); display: flex; align-items: center; justify-content: center; font-size: 24px; margin-bottom: 20px; }
.feature-card h3 { font-size: 18px; font-weight: 600; margin-bottom: 10px; }
.feature-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.7; }

.download-section { background: var(--bg-dark); }
.download-card { background: var(--gradient-card); border: 1px solid var(--border); border-radius: var(--radius-xl); padding: 48px; display: flex; align-items: center; gap: 48px; position: relative; overflow: hidden; }
.download-card::after { content: ''; position: absolute; top: -50%; right: -10%; width: 400px; height: 400px; background: radial-gradient(circle, rgba(26,58,107,0.06) 0%, transparent 70%); }
.download-info { flex: 1; position: relative; z-index: 1; }
.download-info h3 { font-size: 28px; margin-bottom: 12px; }
.download-info p { color: var(--text-secondary); margin-bottom: 24px; }
.download-meta { display: flex; gap: 24px; margin-bottom: 28px; flex-wrap: wrap; }
.download-meta-item { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--text-muted); }
.download-meta-item span { color: var(--text-secondary); font-weight: 600; }
.download-qrcode { width: 160px; height: 160px; background: #fff; border-radius: var(--radius-lg); padding: 8px; position: relative; z-index: 1; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.download-qrcode canvas { width: 100%; height: 100%; }

.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item { background: var(--gradient-card); border: 1px solid var(--border); border-radius: var(--radius-md); margin-bottom: 12px; overflow: hidden; transition: var(--transition); }
.faq-item.active { border-color: rgba(200,168,78,0.3); }
.faq-question { padding: 20px 24px; cursor: pointer; display: flex; justify-content: space-between; align-items: center; font-weight: 600; font-size: 15px; user-select: none; }
.faq-arrow { transition: transform 0.3s ease; color: var(--text-muted); font-size: 18px; }
.faq-item.active .faq-arrow { transform: rotate(180deg); color: var(--accent); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.35s ease, padding 0.35s ease; padding: 0 24px; color: var(--text-secondary); font-size: 14px; line-height: 1.8; }
.faq-item.active .faq-answer { max-height: 300px; padding: 0 24px 20px; }

.footer { background: var(--bg-dark); border-top: 1px solid var(--border); padding: 40px; text-align: center; position: relative; z-index: 1; }
.footer p { font-size: 13px; color: var(--text-muted); } .footer a { color: var(--text-secondary); } .footer a:hover { color: var(--accent); }

.notfound { min-height: 100vh; display: flex; align-items: center; justify-content: center; text-align: center; padding: 40px; }
.notfound-code { font-size: 140px; font-weight: 900; background: var(--gradient-accent); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; line-height: 1; margin-bottom: 12px; }
.notfound h2 { font-size: 24px; margin-bottom: 12px; } .notfound p { color: var(--text-secondary); margin-bottom: 32px; }

@media (max-width: 1024px) { .features-grid { grid-template-columns: repeat(2, 1fr); } .download-card { flex-direction: column; text-align: center; } }
@media (max-width: 768px) { .hero h1 { font-size: 32px; } .hero-stats { gap: 24px; } .section { padding: 60px 20px; } .features-grid { grid-template-columns: 1fr; } .section-title { font-size: 26px; } .download-card { padding: 28px; } .nav { padding: 0 20px; } }