/* ========================================
   爱加速 - V2 深色科技风格 共享样式
   ======================================== */

:root {
    --primary: #06B6D4;
    --primary-dark: #0891B2;
    --primary-light: #22D3EE;
    --primary-glow: rgba(6, 182, 212, 0.12);
    --primary-glow-strong: rgba(6, 182, 212, 0.2);
    --bg: #0B1120;
    --bg-card: #111827;
    --bg-card-hover: #1a2236;
    --bg-section: #0B1120;
    --bg-elevated: #1a2236;
    --text: #F1F5F9;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;
    --border: #1E293B;
    --border-light: #1a2236;
    --border-glow: rgba(6, 182, 212, 0.3);
    --success: #10B981;
    --warning: #F59E0B;
    --radius: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
    --shadow-lg: 0 10px 40px rgba(0,0,0,0.5);
    --shadow-glow: 0 0 40px rgba(6,182,212,0.12);
    --container: 1200px;
    --nav-h: 72px;
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
    font-family: 'Noto Sans SC', 'Inter', -apple-system, sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--primary-dark); border-radius: 3px; }

.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }

/* NAVBAR */
.navbar {
    position: fixed; top: 0; left: 0; right: 0; height: var(--nav-h);
    z-index: 1000; background: rgba(11,17,32,0.85);
    backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid transparent;
    transition: all 0.3s;
}
.navbar.scrolled { border-bottom-color: var(--border); box-shadow: 0 4px 24px rgba(0,0,0,0.3); }

.nav-container {
    max-width: var(--container); margin: 0 auto; padding: 0 24px;
    height: 100%; display: flex; align-items: center; gap: 32px;
}

.nav-logo {
    display: flex; align-items: center; gap: 10px;
    text-decoration: none; color: var(--text); font-weight: 700;
    font-size: 1.2rem; font-family: 'Inter', sans-serif;
}

.nav-links {
    display: flex; align-items: center; gap: 4px; margin-left: auto;
}

.nav-links a {
    text-decoration: none; color: var(--text-secondary);
    font-size: 0.9rem; font-weight: 500;
    padding: 8px 14px; border-radius: 8px; transition: all 0.2s;
}

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

.nav-cta {
    text-decoration: none; background: var(--primary); color: #0B1120;
    font-size: 0.875rem; font-weight: 700; padding: 8px 20px;
    border-radius: 8px; transition: all 0.2s; white-space: nowrap;
}

.nav-cta:hover { background: var(--primary-light); transform: translateY(-1px); }

/* BUTTONS */
.btn-primary {
    display: inline-flex; align-items: center; gap: 8px;
    background: var(--primary); color: #0B1120;
    font-weight: 700; font-size: 0.95rem; padding: 12px 28px;
    border-radius: 10px; text-decoration: none; transition: all 0.2s; border: none; cursor: pointer;
}
.btn-primary:hover { background: var(--primary-light); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(6,182,212,0.3); }
.btn-primary.large { font-size: 1.05rem; padding: 16px 40px; border-radius: 12px; }

.btn-ghost {
    display: inline-flex; align-items: center; gap: 6px;
    color: var(--text-secondary); font-weight: 500; font-size: 0.95rem;
    text-decoration: none; padding: 12px 20px; border-radius: 10px;
    transition: all 0.2s; border: 1px solid var(--border);
}
.btn-ghost:hover { color: var(--primary); border-color: var(--primary); background: var(--primary-glow); }

.btn-outline {
    display: inline-flex; align-items: center; gap: 8px;
    background: transparent; color: var(--primary);
    font-weight: 700; font-size: 0.95rem; padding: 12px 28px;
    border-radius: 10px; text-decoration: none; border: 2px solid var(--primary);
    transition: all 0.2s; cursor: pointer;
}
.btn-outline:hover { background: var(--primary); color: #0B1120; }

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

.section-header { text-align: center; margin-bottom: 60px; }

.section-header h2 {
    font-size: 2.5rem; font-weight: 800; line-height: 1.2;
    margin-bottom: 16px; letter-spacing: -0.02em;
}

.section-header p {
    font-size: 1.1rem; color: var(--text-secondary);
    max-width: 560px; margin: 0 auto;
}

.section-tag {
    display: inline-block; font-size: 0.8rem; font-weight: 700;
    text-transform: uppercase; letter-spacing: 0.08em;
    color: var(--primary); background: var(--primary-glow);
    padding: 6px 14px; border-radius: 20px; margin-bottom: 16px;
    border: 1px solid var(--border-glow);
}

/* HERO */
.hero {
    min-height: 100vh; padding-top: var(--nav-h);
    display: flex; align-items: center; position: relative; overflow: hidden;
}

.hero-bg {
    position: absolute; inset: 0; z-index: 0;
}

.hbg-orb1 {
    position: absolute; top: -300px; right: -200px;
    width: 900px; height: 900px;
    background: radial-gradient(circle, rgba(6,182,212,0.08) 0%, transparent 70%);
    border-radius: 50%;
}

.hbg-orb2 {
    position: absolute; bottom: -400px; left: -200px;
    width: 700px; height: 700px;
    background: radial-gradient(circle, rgba(139,92,246,0.06) 0%, transparent 70%);
    border-radius: 50%;
}

.hbg-grid {
    position: absolute; inset: 0;
    background-image:
        linear-gradient(rgba(6,182,212,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(6,182,212,0.03) 1px, transparent 1px);
    background-size: 60px 60px;
}

.hero-content {
    max-width: var(--container); margin: 0 auto; padding: 0 24px;
    padding-top: 40px; text-align: center; width: 100%; position: relative; z-index: 1;
}

.hero-badge {
    display: inline-flex; align-items: center; gap: 8px;
    font-size: 0.85rem; font-weight: 500; color: var(--primary);
    background: var(--primary-glow); padding: 8px 16px;
    border-radius: 20px; border: 1px solid var(--border-glow);
    margin-bottom: 24px;
}

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

@keyframes pulse-dot {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(1.3); }
}

.hero-title {
    font-size: 3.5rem; font-weight: 900; line-height: 1.1;
    letter-spacing: -0.03em; margin-bottom: 24px;
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary) 0%, #60A5FA 100%);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}

.hero-subtitle {
    font-size: 1.1rem; color: var(--text-secondary);
    line-height: 1.7; margin-bottom: 40px; max-width: 640px; margin-left: auto; margin-right: auto;
}

.hero-stats {
    display: inline-flex; align-items: center;
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 20px 36px;
    margin-bottom: 40px; gap: 0; box-shadow: var(--shadow-md);
}

.stat-item { display: flex; flex-direction: column; align-items: center; flex: 1; padding: 0 24px; }

.stat-num {
    font-size: 1.6rem; font-weight: 800; color: var(--text);
    font-family: 'Inter', sans-serif; letter-spacing: -0.03em;
}
.stat-num span { font-size: 0.9rem; font-weight: 600; }

.stat-label { font-size: 0.75rem; color: var(--text-muted); margin-top: 4px; white-space: nowrap; }

.stat-div { width: 1px; height: 40px; background: var(--border); flex-shrink: 0; }

.hero-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* STATUS BAR */
.status-bar {
    background: var(--bg-card); border-bottom: 1px solid var(--border); padding: 10px 0;
}

.status-bar-inner {
    max-width: var(--container); margin: 0 auto; padding: 0 24px;
    display: flex; align-items: center; gap: 20px;
    font-size: 0.8rem; color: var(--text-secondary);
}

.status-item { display: flex; align-items: center; gap: 6px; color: var(--text); font-weight: 500; }
.s-dot { width: 8px; height: 8px; background: var(--success); border-radius: 50%; }

.lock-info {
    margin-left: auto; display: flex; align-items: center;
    gap: 5px; color: var(--success); font-weight: 600;
}

/* COMPARISON */
.comp-table {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-lg); overflow: hidden; margin-bottom: 32px;
}

.comp-header {
    display: grid; grid-template-columns: 2fr 2fr 2fr;
    background: linear-gradient(135deg, #1E293B, #0f172a);
    color: var(--text-secondary); font-weight: 700; font-size: 0.9rem; padding: 16px 24px;
    border-bottom: 1px solid var(--border);
}

.comp-header .cyan { color: var(--primary-light); }

.comp-row {
    display: grid; grid-template-columns: 2fr 2fr 2fr;
    padding: 16px 24px; border-bottom: 1px solid var(--border);
    font-size: 0.9rem; transition: background 0.2s;
}
.comp-row:last-child { border-bottom: none; }
.comp-row:hover { background: var(--bg-elevated); }

.comp-row > span:first-child { font-weight: 600; color: var(--text); }
.no { color: var(--text-muted); }
.warn { color: var(--warning); }
.yes { color: var(--primary); font-weight: 600; }

.comp-cta { text-align: center; }

/* SCENARIOS */
.scenarios { background: var(--bg-section); }

.scenario-grid {
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px;
}

.scenario-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 28px 24px;
    transition: all 0.3s; position: relative; overflow: hidden;
}
.scenario-card:hover { border-color: var(--border-glow); box-shadow: var(--shadow-glow); transform: translateY(-4px); }
.scenario-card.featured { border-color: var(--border-glow); background: linear-gradient(135deg, rgba(6,182,212,0.05), rgba(6,182,212,0.12)); box-shadow: var(--shadow-glow); }

.sc-num {
    position: absolute; top: 16px; right: 20px;
    font-size: 2.5rem; font-weight: 900; font-family: 'Inter', sans-serif;
    color: var(--border); letter-spacing: -0.05em; line-height: 1;
}

.sc-icon { font-size: 1.8rem; margin-bottom: 14px; }

.scenario-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 10px; line-height: 1.4; }
.scenario-card p { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.6; margin-bottom: 14px; }

.sc-tag {
    font-size: 0.75rem; font-weight: 600; color: var(--primary);
    background: var(--primary-glow); padding: 4px 12px;
    border-radius: 20px; display: inline-block;
}

/* NODES */
.nodes { background: var(--bg-card); }

.nodes-grid {
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-bottom: 28px;
}

.node-region {
    background: var(--bg-elevated); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 18px;
    text-align: center; transition: all 0.2s;
}
.node-region:hover { border-color: var(--border-glow); background: var(--primary-glow); }

.nr-title { font-weight: 700; font-size: 0.95rem; color: var(--text); margin-bottom: 8px; }
.nr-list { font-size: 0.8rem; color: var(--text-secondary); line-height: 1.5; }

.nodes-note {
    text-align: center; font-size: 0.85rem; color: var(--text-muted);
}

/* TECH */
.tech { background: var(--bg-section); }

.tech-grid {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
}

.tech-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 28px;
    transition: all 0.3s; position: relative; overflow: hidden;
}
.tech-card:hover { border-color: var(--border-glow); transform: translateY(-3px); box-shadow: var(--shadow-glow); }

.tc-glow {
    position: absolute; top: 0; left: 0; right: 0; height: 2px;
    background: linear-gradient(90deg, transparent, var(--primary), transparent);
    opacity: 0; transition: opacity 0.3s;
}
.tech-card:hover .tc-glow { opacity: 1; }

.tc-icon { font-size: 1.8rem; margin-bottom: 14px; }
.tech-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.tech-card p { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.6; }

/* SOCIAL PROOF */
.social-proof { background: var(--bg-card); }

.client-grid {
    display: grid; grid-template-columns: repeat(6, 1fr); gap: 14px; margin-bottom: 28px;
}

.client-item {
    background: var(--bg-elevated); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 16px;
    text-align: center; font-size: 0.8rem; font-weight: 600;
    color: var(--text-secondary); transition: all 0.2s;
}
.client-item:hover { border-color: var(--border-glow); color: var(--primary); }

.cert-row {
    display: flex; justify-content: center; gap: 24px; flex-wrap: wrap; margin-bottom: 48px;
}
.cert-row span { font-size: 0.8rem; color: var(--text-muted); font-weight: 500; }

.testimonial {
    background: linear-gradient(135deg, rgba(6,182,212,0.05), rgba(6,182,212,0.12));
    border: 1px solid var(--border-glow); border-radius: var(--radius-xl);
    padding: 40px 48px; text-align: center; position: relative;
}

.quote-mark {
    font-size: 4rem; color: var(--primary); line-height: 1;
    font-family: Georgia, serif; opacity: 0.25;
    position: absolute; top: 20px; left: 40px;
}

.quote-text { font-size: 1.15rem; color: var(--text); line-height: 1.7; font-weight: 500; max-width: 700px; margin: 0 auto 16px; }
.quote-author { font-size: 0.85rem; color: var(--text-secondary); font-weight: 600; }

/* PRICING */
.pricing { background: var(--bg-section); }

.pricing-grid {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-bottom: 32px;
}

.pricing-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-xl); padding: 36px 28px;
    position: relative; transition: all 0.3s;
}
.pricing-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.pricing-card.popular { border-color: var(--border-glow); box-shadow: var(--shadow-glow); }

.pc-badge {
    display: inline-block; font-size: 0.75rem; font-weight: 700;
    color: var(--text-secondary); background: var(--bg-elevated);
    padding: 4px 12px; border-radius: 20px; margin-bottom: 16px;
}
.pc-badge.hot { color: #FB923C; background: rgba(251,146,60,0.1); }

.pricing-card h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 16px; }

.pc-price { margin-bottom: 12px; }
.pc-amount { font-size: 2.5rem; font-weight: 900; color: var(--text); font-family: 'Inter', sans-serif; letter-spacing: -0.04em; }
.pc-period { font-size: 1rem; color: var(--text-muted); font-weight: 500; }

.pc-desc {
    font-size: 0.85rem; color: var(--text-secondary); line-height: 1.6;
    margin-bottom: 24px; padding-bottom: 24px; border-bottom: 1px solid var(--border);
}

.pc-features { display: flex; flex-direction: column; gap: 10px; margin-bottom: 28px; }
.pc-features > div { font-size: 0.875rem; color: var(--text-secondary); }

.pricing-card .btn-primary, .pricing-card .btn-outline { width: 100%; justify-content: center; }
.pricing-card.popular .btn-primary { box-shadow: 0 4px 16px rgba(6,182,212,0.25); }
.pricing-card.popular::before {
    content: '推荐'; position: absolute; top: -1px; right: 24px;
    background: var(--primary); color: #0B1120;
    font-size: 0.7rem; font-weight: 700; padding: 4px 16px;
    border-radius: 0 0 8px 8px; letter-spacing: 0.05em;
}

.pricing-note { text-align: center; font-size: 0.85rem; color: var(--text-muted); }

/* FAQ */
.faq { background: var(--bg-card); }

.faq-list { max-width: 760px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }

.faq-item {
    background: var(--bg-elevated); border: 1px solid var(--border);
    border-radius: var(--radius); overflow: hidden; transition: all 0.3s;
}
.faq-item:hover, .faq-item.open { border-color: var(--border-glow); }

.faq-q {
    display: flex; justify-content: space-between; align-items: center;
    padding: 20px 24px; font-weight: 600; font-size: 0.95rem;
    cursor: pointer; gap: 16px;
}
.faq-q svg { flex-shrink: 0; color: var(--text-muted); transition: transform 0.3s; }
.faq-item.open .faq-q svg { transform: rotate(45deg); }

.faq-a {
    max-height: 0; overflow: hidden; transition: all 0.3s;
    font-size: 0.9rem; color: var(--text-secondary); line-height: 1.7; padding: 0 24px;
}
.faq-item.open .faq-a { max-height: 200px; padding: 0 24px 20px; }

/* FOOTER */
.footer { background: var(--bg-section); border-top: 1px solid var(--border); padding: 80px 0 40px; }

.footer-cta { text-align: center; margin-bottom: 64px; }
.footer-cta h2 { font-size: 2rem; font-weight: 800; margin-bottom: 12px; }
.footer-cta p { font-size: 1rem; color: var(--text-secondary); margin-bottom: 28px; }

.footer-links {
    display: grid; grid-template-columns: repeat(4, 1fr);
    gap: 32px; margin-bottom: 48px;
}

.fl-col { display: flex; flex-direction: column; gap: 10px; }
.fl-title { font-weight: 700; font-size: 0.85rem; color: var(--text); margin-bottom: 6px; }
.fl-col a { text-decoration: none; font-size: 0.85rem; color: var(--text-secondary); transition: color 0.2s; }
.fl-col a:hover { color: var(--primary); }

.footer-bottom {
    border-top: 1px solid var(--border); padding-top: 24px;
    display: flex; justify-content: space-between; align-items: center;
    font-size: 0.8rem; color: var(--text-muted);
}
.footer-bottom a { color: var(--text-muted); text-decoration: none; }
.footer-bottom a:hover { color: var(--primary); }

/* RESPONSIVE */
@media (max-width: 1024px) {
    .hero-stats { padding: 16px 20px; }
    .stat-item { padding: 0 12px; }
    .scenario-grid { grid-template-columns: repeat(2, 1fr); }
    .pricing-grid { grid-template-columns: 1fr; max-width: 480px; margin: 0 auto 32px; }
    .footer-links { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
    :root { --nav-h: 64px; }
    .hero-title { font-size: 2.5rem; }
    .hero-stats { flex-wrap: wrap; gap: 8px; }
    .section { padding: 64px 0; }
    .section-header h2 { font-size: 1.8rem; }
    .comp-header, .comp-row { padding: 12px 16px; font-size: 0.8rem; }
    .scenario-grid { grid-template-columns: 1fr; }
    .tech-grid { grid-template-columns: 1fr; }
    .client-grid { grid-template-columns: repeat(2, 1fr); }
    .nav-links { display: none; }
    .cert-row { flex-direction: column; gap: 10px; align-items: center; }
    .footer-links { grid-template-columns: repeat(2, 1fr); }
    .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
}