/* ===== 全局变量与基础样式 ===== */
:root {
    --blue: #3b82f6;
    --blue-dark: #2563eb;
    --indigo: #6366f1;
    --indigo-dark: #4f46e5;
    --purple: #8b5cf6;
    --gold: #f59e0b;
    --gold-dark: #d97706;
    --cyan: #06b6d4;
    --green: #10b981;
    --orange: #f97316;
    --dark: #0f172a;
    --dark-2: #1e293b;
    --dark-3: #334155;
    --text: #1e293b;
    --text-muted: #64748b;
    --text-light: #94a3b8;
    --border: #e2e8f0;
    --bg-light: #f8fafc;
    --white: #ffffff;
    --radius: 16px;
    --radius-sm: 10px;
    --shadow: 0 4px 24px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 40px rgba(0,0,0,0.14);
    --transition: 0.3s ease;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text);
    background: var(--white);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; transition: var(--transition); }
img { max-width: 100%; display: block; }

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

/* ===== 公告栏 ===== */
.announcement-bar {
    background: linear-gradient(90deg, var(--indigo-dark), var(--blue-dark));
    color: white;
    padding: 10px 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    font-size: 14px;
    position: relative;
    z-index: 200;
}
.announcement-inner { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; justify-content: center; }
.announcement-inner i { opacity: 0.9; }
.announcement-btn {
    background: rgba(255,255,255,0.2);
    border: 1px solid rgba(255,255,255,0.4);
    color: white;
    padding: 3px 12px;
    border-radius: 20px;
    font-size: 13px;
    white-space: nowrap;
    transition: var(--transition);
}
.announcement-btn:hover { background: rgba(255,255,255,0.35); }
.announcement-close {
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: rgba(255,255,255,0.7);
    cursor: pointer;
    font-size: 14px;
    padding: 4px;
    transition: var(--transition);
}
.announcement-close:hover { color: white; }

/* ===== 导航栏 ===== */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    transition: var(--transition);
}
.navbar.scrolled { box-shadow: 0 2px 20px rgba(0,0,0,0.08); }

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo { display: flex; align-items: center; gap: 12px; }
.logo-icon {
    width: 42px; height: 42px;
    background: linear-gradient(135deg, var(--blue), var(--indigo));
    border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    color: white;
    font-size: 22px;
    font-weight: 900;
    letter-spacing: -1px;
    box-shadow: 0 4px 12px rgba(99,102,241,0.35);
    flex-shrink: 0;
}
.logo-text { display: flex; flex-direction: column; line-height: 1.2; }
.logo-main { font-size: 18px; font-weight: 700; color: var(--text); letter-spacing: 0.5px; }
.logo-sub { font-size: 11px; color: var(--text-muted); }

.nav-menu { display: flex; align-items: center; gap: 4px; list-style: none; }
.nav-link {
    padding: 8px 14px;
    border-radius: 8px;
    font-size: 15px;
    color: var(--text-muted);
    font-weight: 500;
    transition: var(--transition);
}
.nav-link:hover, .nav-link.active { color: var(--blue); background: rgba(59,130,246,0.07); }
.nav-btn-link {
    padding: 9px 22px;
    background: linear-gradient(135deg, var(--blue), var(--indigo));
    color: white !important;
    border-radius: 22px;
    font-size: 14px;
    font-weight: 600;
    margin-left: 8px;
    box-shadow: 0 4px 14px rgba(99,102,241,0.35);
    transition: var(--transition);
}
.nav-btn-link:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(99,102,241,0.45); }

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}
.nav-toggle span {
    display: block;
    width: 24px; height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: var(--transition);
}

/* ===== 通用按钮 ===== */
.btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 12px 28px;
    border-radius: 50px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    white-space: nowrap;
}
.btn-lg { padding: 15px 36px; font-size: 16px; }
.btn-primary {
    background: linear-gradient(135deg, var(--blue), var(--indigo));
    color: white;
    box-shadow: 0 4px 20px rgba(99,102,241,0.4);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(99,102,241,0.5); }
.btn-outline {
    background: rgba(255,255,255,0.12);
    color: white;
    border: 1.5px solid rgba(255,255,255,0.5);
    backdrop-filter: blur(4px);
}
.btn-outline:hover { background: rgba(255,255,255,0.22); border-color: white; }

/* ===== Hero ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--dark) 0%, var(--dark-2) 60%, #1a1060 100%);
    overflow: hidden;
    padding: 100px 24px 80px;
}
.hero-bg { position: absolute; inset: 0; pointer-events: none; }
.hero-grid {
    position: absolute; inset: 0;
    background-image:
        linear-gradient(rgba(99,102,241,0.08) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99,102,241,0.08) 1px, transparent 1px);
    background-size: 60px 60px;
}
.hero-glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.25;
}
.hero-glow-1 {
    width: 600px; height: 600px;
    background: radial-gradient(circle, var(--indigo), transparent);
    top: -150px; right: -100px;
}
.hero-glow-2 {
    width: 500px; height: 500px;
    background: radial-gradient(circle, var(--blue), transparent);
    bottom: -100px; left: -100px;
}

.hero-content {
    position: relative;
    text-align: center;
    max-width: 780px;
    z-index: 1;
}
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(99,102,241,0.2);
    border: 1px solid rgba(99,102,241,0.4);
    color: #a5b4fc;
    padding: 8px 20px;
    border-radius: 30px;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 28px;
}
.hero-title {
    font-size: clamp(36px, 6vw, 68px);
    font-weight: 900;
    color: white;
    line-height: 1.15;
    margin-bottom: 24px;
    letter-spacing: -1px;
}
.gradient-text {
    background: linear-gradient(135deg, #60a5fa, #a78bfa, #f472b6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-desc {
    font-size: 18px;
    color: rgba(255,255,255,0.7);
    margin-bottom: 40px;
    line-height: 1.8;
}
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-bottom: 60px; }
.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 20px;
    padding: 24px 40px;
    backdrop-filter: blur(8px);
    flex-wrap: wrap;
    gap: 0;
}
.stat-item {
    display: flex; flex-direction: column; align-items: center;
    padding: 0 32px;
}
.stat-num {
    font-size: 40px;
    font-weight: 900;
    color: white;
    line-height: 1;
    display: inline;
}
.stat-suffix { font-size: 24px; font-weight: 700; color: #93c5fd; }
.stat-label { font-size: 13px; color: rgba(255,255,255,0.55); margin-top: 6px; }
.stat-divider { width: 1px; height: 50px; background: rgba(255,255,255,0.15); }

.hero-scroll {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}
.hero-scroll a { color: rgba(255,255,255,0.4); font-size: 20px; }
.hero-scroll a:hover { color: rgba(255,255,255,0.8); }

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(8px); }
}

/* ===== 通用Section ===== */
.section { padding: 100px 0; }
.section-light { background: var(--bg-light); }
.section-dark {
    background: linear-gradient(135deg, var(--dark) 0%, var(--dark-2) 100%);
    color: white;
}
.section-header {
    text-align: center;
    margin-bottom: 60px;
}
.section-tag {
    display: inline-block;
    background: rgba(59,130,246,0.1);
    color: var(--blue);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    padding: 6px 18px;
    border-radius: 30px;
    margin-bottom: 16px;
    border: 1px solid rgba(59,130,246,0.2);
}
.section-tag-light {
    background: rgba(255,255,255,0.12);
    color: #93c5fd;
    border-color: rgba(255,255,255,0.2);
}
.section-title {
    font-size: clamp(26px, 4vw, 42px);
    font-weight: 800;
    color: var(--text);
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}
.section-title-light { color: white; }
.section-desc { font-size: 17px; color: var(--text-muted); max-width: 620px; margin: 0 auto; }
.section-desc-light { color: rgba(255,255,255,0.6); }

/* ===== Features Grid ===== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.feature-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px 28px;
    transition: var(--transition);
}
.feature-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(99,102,241,0.2);
}
.feature-icon {
    width: 56px; height: 56px;
    border-radius: 14px;
    display: flex; align-items: center; justify-content: center;
    font-size: 22px;
    margin-bottom: 20px;
}
.feature-icon-blue { background: rgba(59,130,246,0.1); color: var(--blue); }
.feature-icon-indigo { background: rgba(99,102,241,0.1); color: var(--indigo); }
.feature-icon-purple { background: rgba(139,92,246,0.1); color: var(--purple); }
.feature-icon-cyan { background: rgba(6,182,212,0.1); color: var(--cyan); }
.feature-icon-green { background: rgba(16,185,129,0.1); color: var(--green); }
.feature-icon-orange { background: rgba(249,115,22,0.1); color: var(--orange); }
.feature-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; color: var(--text); }
.feature-card p { font-size: 14px; color: var(--text-muted); line-height: 1.7; }

/* ===== Car Tabs & Grid ===== */
.car-tabs {
    display: flex;
    gap: 8px;
    justify-content: center;
    margin-bottom: 40px;
    flex-wrap: wrap;
}
.car-tab {
    padding: 8px 22px;
    border-radius: 30px;
    border: 1.5px solid rgba(255,255,255,0.15);
    background: rgba(255,255,255,0.06);
    color: rgba(255,255,255,0.6);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}
.car-tab:hover, .car-tab.active {
    background: rgba(99,102,241,0.3);
    border-color: rgba(99,102,241,0.6);
    color: white;
}
.cars-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}
.car-card {
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius);
    padding: 28px;
    position: relative;
    overflow: hidden;
    transition: var(--transition);
}
.car-card:hover {
    background: rgba(255,255,255,0.1);
    border-color: rgba(99,102,241,0.4);
    transform: translateY(-4px);
    box-shadow: 0 8px 32px rgba(0,0,0,0.3);
}
.car-card.hidden { display: none; }
.car-badge {
    position: absolute;
    top: 20px; right: 20px;
    background: rgba(59,130,246,0.3);
    color: #93c5fd;
    font-size: 12px;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 20px;
    border: 1px solid rgba(59,130,246,0.4);
}
.car-badge-hot { background: rgba(239,68,68,0.25); color: #fca5a5; border-color: rgba(239,68,68,0.4); }
.car-badge-luxury { background: rgba(245,158,11,0.25); color: #fcd34d; border-color: rgba(245,158,11,0.4); }
.car-icon-wrap {
    width: 80px; height: 80px;
    background: rgba(99,102,241,0.15);
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    margin-bottom: 20px;
    border: 1px solid rgba(99,102,241,0.25);
}
.car-icon { font-size: 32px; color: #a5b4fc; }
.car-brand { font-size: 12px; color: rgba(255,255,255,0.45); margin-bottom: 4px; text-transform: uppercase; letter-spacing: 1px; }
.car-model { font-size: 22px; font-weight: 800; color: white; margin-bottom: 12px; }
.car-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 16px; }
.car-tag {
    background: rgba(255,255,255,0.08);
    color: rgba(255,255,255,0.6);
    font-size: 12px;
    padding: 3px 10px;
    border-radius: 10px;
    border: 1px solid rgba(255,255,255,0.12);
}
.car-price-row { display: flex; align-items: center; gap: 8px; }
.car-price-label { font-size: 12px; color: rgba(255,255,255,0.4); }
.car-price { font-size: 18px; font-weight: 700; color: var(--gold); }
.cars-note {
    text-align: center;
    color: rgba(255,255,255,0.35);
    font-size: 13px;
    margin-top: 32px;
    display: flex;
    align-items: center;
    gap: 6px;
    justify-content: center;
}

/* ===== Plans Grid ===== */
.plans-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    align-items: stretch;
}
.plan-card {
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    position: relative;
}
.plan-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.plan-card-featured {
    border-color: var(--indigo);
    box-shadow: 0 8px 40px rgba(99,102,241,0.25);
    transform: scale(1.02);
}
.plan-card-featured:hover { transform: scale(1.02) translateY(-6px); }
.plan-badge-top {
    position: absolute;
    top: 0; left: 50%; transform: translateX(-50%);
    background: linear-gradient(135deg, var(--blue), var(--indigo));
    color: white;
    font-size: 12px;
    font-weight: 700;
    padding: 4px 20px;
    border-radius: 0 0 12px 12px;
    letter-spacing: 1px;
    z-index: 1;
}
.plan-header {
    padding: 36px 28px 28px;
    text-align: center;
    color: white;
}
.plan-header-purple { background: linear-gradient(135deg, #7c3aed, #8b5cf6); }
.plan-header-indigo { background: linear-gradient(135deg, var(--indigo-dark), var(--blue-dark)); }
.plan-header-gold { background: linear-gradient(135deg, #b45309, var(--gold-dark)); }
.plan-icon {
    width: 56px; height: 56px;
    background: rgba(255,255,255,0.18);
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: 24px;
    margin: 0 auto 14px;
}
.plan-name { font-size: 20px; font-weight: 700; margin-bottom: 14px; }
.plan-price { display: flex; align-items: baseline; justify-content: center; gap: 2px; margin-bottom: 6px; }
.plan-currency { font-size: 20px; font-weight: 700; opacity: 0.9; }
.plan-amount { font-size: 44px; font-weight: 900; line-height: 1; }
.plan-unit { font-size: 16px; opacity: 0.8; }
.plan-period { font-size: 13px; opacity: 0.65; }
.plan-body { padding: 28px; flex: 1; display: flex; flex-direction: column; gap: 0; background: white; }
.plan-benefits { list-style: none; margin-bottom: 28px; flex: 1; }
.plan-benefits li {
    display: flex; align-items: flex-start; gap: 10px;
    padding: 9px 0;
    border-bottom: 1px solid var(--border);
    font-size: 14px;
    color: var(--text);
}
.plan-benefits li:last-child { border-bottom: none; }
.plan-benefits li.disabled { color: var(--text-light); }
.plan-benefits li i.fa-check { color: var(--green); flex-shrink: 0; margin-top: 3px; }
.plan-benefits li i.fa-times { color: var(--text-light); flex-shrink: 0; margin-top: 3px; }
.plan-btn {
    display: block;
    text-align: center;
    padding: 13px 24px;
    border-radius: 50px;
    font-size: 15px;
    font-weight: 600;
    transition: var(--transition);
    border: 2px solid transparent;
}
.plan-btn-primary {
    background: linear-gradient(135deg, var(--blue), var(--indigo));
    color: white;
    box-shadow: 0 4px 16px rgba(99,102,241,0.35);
}
.plan-btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(99,102,241,0.45); }
.plan-btn-outline {
    border-color: var(--indigo);
    color: var(--indigo);
}
.plan-btn-outline:hover { background: var(--indigo); color: white; }

.share-rule {
    display: flex; gap: 20px; align-items: flex-start;
    background: rgba(59,130,246,0.06);
    border: 1px solid rgba(59,130,246,0.15);
    border-radius: var(--radius);
    padding: 28px;
    margin-top: 40px;
}
.share-rule-icon { color: var(--blue); font-size: 22px; flex-shrink: 0; margin-top: 3px; }
.share-rule-content h4 { font-size: 17px; font-weight: 700; margin-bottom: 8px; color: var(--text); }
.share-rule-content p { font-size: 14px; color: var(--text-muted); line-height: 1.7; }

/* ===== Steps ===== */
.steps-wrap {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: 0;
    flex-wrap: wrap;
}
.step {
    flex: 1;
    min-width: 180px;
    max-width: 240px;
    text-align: center;
    padding: 32px 20px;
    background: white;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
}
.step:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.step-num {
    font-size: 48px;
    font-weight: 900;
    color: rgba(59,130,246,0.1);
    line-height: 1;
    margin-bottom: 8px;
}
.step-icon {
    width: 56px; height: 56px;
    background: linear-gradient(135deg, rgba(59,130,246,0.12), rgba(99,102,241,0.12));
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: 22px;
    color: var(--indigo);
    margin: 0 auto 16px;
}
.step h4 { font-size: 17px; font-weight: 700; margin-bottom: 8px; color: var(--text); }
.step p { font-size: 13px; color: var(--text-muted); line-height: 1.6; }
.step-arrow {
    color: var(--text-light);
    font-size: 18px;
    padding: 0 8px;
    padding-top: 56px;
    align-self: flex-start;
}

/* ===== Cities ===== */
.cities-wrap {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    align-items: start;
}
.map-placeholder {
    background: linear-gradient(135deg, var(--dark-2), #1a1060);
    border-radius: var(--radius);
    aspect-ratio: 1.2;
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(99,102,241,0.2);
}
.map-bg-text {
    position: absolute;
    bottom: 20px; right: 20px;
    font-size: 80px;
    font-weight: 900;
    color: rgba(255,255,255,0.03);
    letter-spacing: 8px;
    pointer-events: none;
    user-select: none;
}
.map-dots { position: absolute; inset: 0; }
.map-dot {
    position: absolute;
    transform: translate(-50%, -50%);
    cursor: pointer;
}
.map-dot span {
    display: block;
    font-size: 11px;
    color: rgba(255,255,255,0.5);
    white-space: nowrap;
    margin-top: 2px;
    text-align: center;
    transform: translateX(-50%);
    position: absolute;
    left: 50%;
    top: 100%;
}
.map-dot::before {
    content: '';
    display: block;
    width: 8px; height: 8px;
    background: rgba(255,255,255,0.25);
    border-radius: 50%;
    border: 1.5px solid rgba(255,255,255,0.4);
    transition: var(--transition);
}
.map-dot:hover::before { transform: scale(1.5); }
.map-dot-active::before {
    background: rgba(99,102,241,0.8);
    border-color: var(--indigo);
    box-shadow: 0 0 8px rgba(99,102,241,0.8);
    animation: pulse-dot 2s infinite;
}
.map-dot-active span { color: rgba(165,180,252,0.9); }
@keyframes pulse-dot {
    0%, 100% { box-shadow: 0 0 0 0 rgba(99,102,241,0.6); }
    50% { box-shadow: 0 0 0 6px rgba(99,102,241,0); }
}
.map-legend {
    position: absolute;
    bottom: 20px; left: 20px;
    font-size: 12px;
    color: rgba(255,255,255,0.4);
    display: flex; align-items: center; gap: 6px;
}
.legend-dot {
    width: 8px; height: 8px;
    border-radius: 50%;
    background: rgba(255,255,255,0.2);
    border: 1.5px solid rgba(255,255,255,0.35);
    display: inline-block;
}
.legend-dot-active {
    background: rgba(99,102,241,0.8);
    border-color: var(--indigo);
    box-shadow: 0 0 6px rgba(99,102,241,0.8);
}
.cities-list-title { font-size: 20px; font-weight: 700; margin-bottom: 20px; color: var(--text); }
.city-items { display: flex; flex-direction: column; gap: 14px; }
.city-item {
    display: flex; align-items: center; gap: 12px;
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 14px 18px;
}
.city-name { width: 80px; font-size: 14px; font-weight: 600; display: flex; align-items: center; gap: 6px; }
.city-progress-wrap {
    flex: 1;
    height: 6px;
    background: var(--bg-light);
    border-radius: 3px;
    overflow: hidden;
}
.city-progress {
    height: 100%;
    background: linear-gradient(90deg, var(--blue), var(--indigo));
    border-radius: 3px;
    transition: width 1s ease;
}
.city-quota { width: 56px; font-size: 13px; color: var(--text-muted); text-align: right; }
.quota-used { font-weight: 700; color: var(--text); }
.city-status { width: 72px; font-size: 12px; font-weight: 600; padding: 3px 10px; border-radius: 20px; text-align: center; }
.city-status-open { background: rgba(16,185,129,0.1); color: var(--green); }
.city-status-warning { background: rgba(245,158,11,0.12); color: var(--gold-dark); }

/* ===== Promises Grid ===== */
.promises-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}
.promise-card {
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius);
    padding: 32px 24px;
    text-align: center;
    transition: var(--transition);
    position: relative;
}
.promise-card:hover {
    background: rgba(255,255,255,0.1);
    border-color: rgba(99,102,241,0.4);
    transform: translateY(-4px);
}
.promise-num {
    font-size: 48px;
    font-weight: 900;
    color: rgba(255,255,255,0.05);
    position: absolute;
    top: 16px; right: 20px;
    line-height: 1;
}
.promise-icon { font-size: 36px; color: #93c5fd; margin-bottom: 16px; display: block; }
.promise-card h4 { font-size: 18px; font-weight: 700; color: white; margin-bottom: 10px; }
.promise-card p { font-size: 14px; color: rgba(255,255,255,0.55); line-height: 1.7; }

/* ===== FAQ ===== */
.faq-wrap { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition);
}
.faq-item:hover { border-color: rgba(99,102,241,0.3); box-shadow: 0 2px 12px rgba(0,0,0,0.06); }
.faq-item.open { border-color: rgba(99,102,241,0.4); }
.faq-q {
    display: flex; align-items: center; justify-content: space-between; gap: 16px;
    padding: 20px 24px;
    font-size: 15px;
    font-weight: 600;
    color: var(--text);
    user-select: none;
}
.faq-arrow { color: var(--text-light); transition: transform 0.3s; flex-shrink: 0; }
.faq-item.open .faq-arrow { transform: rotate(180deg); color: var(--indigo); }
.faq-a {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease;
    background: var(--bg-light);
}
.faq-a p {
    padding: 0 24px 20px;
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.8;
}
.faq-item.open .faq-a { max-height: 300px; }

/* ===== Join Section ===== */
.section-join {
    background: linear-gradient(135deg, var(--bg-light) 0%, white 100%);
}
.join-wrap {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 48px;
    align-items: start;
}
.join-title { font-size: 36px; font-weight: 800; color: var(--text); margin-bottom: 14px; letter-spacing: -0.5px; }
.join-desc { font-size: 15px; color: var(--text-muted); margin-bottom: 32px; line-height: 1.7; }
.qr-section { display: flex; gap: 20px; margin-bottom: 32px; }
.qr-box { text-align: center; }
.qr-img {
    width: 120px; height: 120px;
    background: linear-gradient(135deg, rgba(59,130,246,0.08), rgba(99,102,241,0.08));
    border: 2px dashed rgba(99,102,241,0.3);
    border-radius: var(--radius-sm);
    display: flex; align-items: center; justify-content: center;
    font-size: 44px;
    color: var(--indigo);
    margin-bottom: 8px;
}
.qr-box p { font-size: 13px; color: var(--text-muted); }
.contact-items { display: flex; flex-direction: column; gap: 12px; }
.contact-item {
    display: flex; align-items: center; gap: 12px;
    font-size: 14px; color: var(--text-muted);
}
.contact-item i { width: 20px; color: var(--blue); text-align: center; }

/* ===== Form ===== */
.join-form {
    background: white;
    border-radius: var(--radius);
    padding: 36px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border);
}
.form-title { font-size: 22px; font-weight: 700; margin-bottom: 24px; color: var(--text); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 14px; font-weight: 600; color: var(--text); margin-bottom: 8px; }
.required { color: #ef4444; }
.form-group input, .form-group select, .form-group textarea {
    width: 100%;
    padding: 11px 16px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 14px;
    color: var(--text);
    font-family: inherit;
    background: white;
    transition: var(--transition);
    outline: none;
    -webkit-appearance: none;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
    border-color: var(--indigo);
    box-shadow: 0 0 0 3px rgba(99,102,241,0.12);
}
.form-group textarea { resize: vertical; }
.form-agree {
    display: flex; align-items: flex-start; gap: 10px;
    font-size: 13px; color: var(--text-muted);
    margin-bottom: 20px;
}
.form-agree a { color: var(--blue); }
.form-agree input[type="checkbox"] { width: 16px; height: 16px; margin-top: 2px; flex-shrink: 0; cursor: pointer; accent-color: var(--indigo); }
.form-submit {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, var(--blue), var(--indigo));
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    display: flex; align-items: center; justify-content: center; gap: 8px;
    transition: var(--transition);
    font-family: inherit;
}
.form-submit:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(99,102,241,0.4); }

/* ===== Footer ===== */
.footer {
    background: var(--dark);
    color: rgba(255,255,255,0.7);
}
.footer-top {
    display: flex; gap: 64px;
    padding: 60px 0 40px;
    border-bottom: 1px solid rgba(255,255,255,0.07);
}
.footer-brand { flex: 0 0 280px; }
.footer-logo {
    display: flex; align-items: center; gap: 10px;
    font-size: 18px; font-weight: 700; color: white;
    margin-bottom: 14px;
}
.logo-icon-sm { width: 34px; height: 34px; font-size: 18px; border-radius: 9px; }
.footer-slogan { font-size: 14px; line-height: 1.8; color: rgba(255,255,255,0.45); margin-bottom: 20px; }
.footer-social { display: flex; gap: 10px; }
.footer-social a {
    width: 36px; height: 36px;
    background: rgba(255,255,255,0.07);
    border-radius: 9px;
    display: flex; align-items: center; justify-content: center;
    font-size: 16px;
    color: rgba(255,255,255,0.5);
    transition: var(--transition);
    border: 1px solid rgba(255,255,255,0.1);
}
.footer-social a:hover { background: rgba(99,102,241,0.3); color: white; border-color: rgba(99,102,241,0.4); }
.footer-links { flex: 1; display: flex; gap: 48px; }
.footer-col { display: flex; flex-direction: column; gap: 10px; }
.footer-col h5 { font-size: 14px; font-weight: 700; color: white; margin-bottom: 4px; }
.footer-col a { font-size: 13px; color: rgba(255,255,255,0.45); transition: var(--transition); }
.footer-col a:hover { color: rgba(255,255,255,0.9); padding-left: 2px; }
.footer-bottom {
    padding: 20px 0;
    text-align: center;
    font-size: 12px;
    color: rgba(255,255,255,0.25);
    line-height: 2;
}

/* ===== 回到顶部 ===== */
.back-top {
    position: fixed;
    bottom: 32px; right: 32px;
    width: 46px; height: 46px;
    background: linear-gradient(135deg, var(--blue), var(--indigo));
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    font-size: 16px;
    box-shadow: 0 4px 16px rgba(99,102,241,0.4);
    transition: var(--transition);
    opacity: 0;
    pointer-events: none;
    z-index: 99;
    display: flex; align-items: center; justify-content: center;
}
.back-top.visible { opacity: 1; pointer-events: all; }
.back-top:hover { transform: translateY(-3px); box-shadow: 0 8px 24px rgba(99,102,241,0.5); }

/* ===== Modal ===== */
.modal-overlay {
    position: fixed; inset: 0;
    background: rgba(0,0,0,0.6);
    backdrop-filter: blur(4px);
    display: flex; align-items: center; justify-content: center;
    z-index: 999;
    opacity: 0; pointer-events: none;
    transition: var(--transition);
}
.modal-overlay.active { opacity: 1; pointer-events: all; }
.modal-box {
    background: white;
    border-radius: 24px;
    padding: 48px 40px;
    text-align: center;
    max-width: 420px;
    width: 90%;
    box-shadow: 0 24px 80px rgba(0,0,0,0.25);
    transform: scale(0.9);
    transition: var(--transition);
}
.modal-overlay.active .modal-box { transform: scale(1); }
.modal-icon { font-size: 56px; color: var(--green); margin-bottom: 16px; }
.modal-box h3 { font-size: 24px; font-weight: 800; color: var(--text); margin-bottom: 12px; }
.modal-box p { font-size: 15px; color: var(--text-muted); line-height: 1.7; margin-bottom: 28px; }
.modal-close-btn {
    background: linear-gradient(135deg, var(--blue), var(--indigo));
    color: white;
    border: none;
    padding: 12px 36px;
    border-radius: 50px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    font-family: inherit;
    transition: var(--transition);
}
.modal-close-btn:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(99,102,241,0.4); }

/* ===== Reveal 动画 ===== */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .plans-grid { grid-template-columns: 1fr; max-width: 480px; margin: 0 auto; }
    .plan-card-featured { transform: none; }
    .plan-card-featured:hover { transform: translateY(-6px); }
    .promises-grid { grid-template-columns: repeat(2, 1fr); }
    .cars-grid { grid-template-columns: repeat(2, 1fr); }
    .cities-wrap { grid-template-columns: 1fr; }
    .join-wrap { grid-template-columns: 1fr; }
    .footer-top { flex-direction: column; gap: 32px; }
    .footer-brand { flex: none; }
}

@media (max-width: 768px) {
    .section { padding: 72px 0; }
    .nav-menu {
        position: fixed;
        top: 68px; left: 0; right: 0;
        background: white;
        flex-direction: column;
        padding: 20px;
        gap: 4px;
        box-shadow: 0 8px 24px rgba(0,0,0,0.12);
        transform: translateY(-120%);
        transition: transform 0.3s ease;
        border-bottom: 1px solid var(--border);
    }
    .nav-menu.open { transform: translateY(0); }
    .nav-toggle { display: flex; }
    .nav-btn-link { display: block; text-align: center; border-radius: 12px; }
    .features-grid { grid-template-columns: 1fr; }
    .hero-stats { padding: 16px 20px; gap: 8px; }
    .stat-item { padding: 0 16px; }
    .stat-num { font-size: 28px; }
    .steps-wrap { flex-direction: column; align-items: center; }
    .step-arrow { transform: rotate(90deg); padding: 0; margin: 4px 0; }
    .form-row { grid-template-columns: 1fr; }
    .cars-grid { grid-template-columns: 1fr; }
    .footer-links { flex-direction: column; gap: 24px; }
    .hero-actions { flex-direction: column; align-items: center; }
    .btn-lg { width: 100%; justify-content: center; }
    .qr-section { justify-content: center; }
}

@media (max-width: 480px) {
    .hero-stats { flex-direction: column; }
    .stat-divider { width: 80%; height: 1px; }
    .stat-item { padding: 8px 0; }
    .join-form { padding: 24px; }
    .promises-grid { grid-template-columns: 1fr; }
}

/* ===== 品牌视频广告区 ===== */
.section-videos {
    background: linear-gradient(160deg, #080d1a 0%, #0d1530 40%, #0a0f24 100%);
    position: relative;
    overflow: hidden;
}
.section-videos::before {
    content: '';
    position: absolute;
    top: -200px; left: 50%;
    transform: translateX(-50%);
    width: 900px; height: 500px;
    background: radial-gradient(ellipse, rgba(99,102,241,0.12) 0%, transparent 70%);
    pointer-events: none;
}

/* 主播放器区 */
.video-main-wrap {
    display: grid;
    grid-template-columns: 1fr 380px;
    gap: 32px;
    margin-bottom: 32px;
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 20px;
    overflow: hidden;
}
.video-main-player {
    position: relative;
    background: #000;
}
.video-frame-wrap {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%; /* 16:9 */
    height: 0;
    overflow: hidden;
}
.video-frame-wrap iframe {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    border: none;
}
.video-main-info {
    padding: 36px 28px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 0;
}
.video-main-tag {
    display: inline-block;
    background: rgba(99,102,241,0.25);
    border: 1px solid rgba(99,102,241,0.45);
    color: #a5b4fc;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 1.5px;
    padding: 5px 14px;
    border-radius: 20px;
    margin-bottom: 14px;
    text-transform: uppercase;
    width: fit-content;
}
.video-main-title {
    font-size: 22px;
    font-weight: 800;
    color: white;
    margin-bottom: 14px;
    line-height: 1.3;
}
.video-main-desc {
    font-size: 14px;
    color: rgba(255,255,255,0.55);
    line-height: 1.8;
    margin-bottom: 20px;
}
.video-main-specs {
    display: flex;
    flex-direction: column;
    gap: 9px;
    margin-bottom: 24px;
}
.vspec {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 13px;
    color: rgba(255,255,255,0.65);
}
.vspec i {
    width: 28px; height: 28px;
    background: rgba(99,102,241,0.18);
    border-radius: 8px;
    display: flex; align-items: center; justify-content: center;
    color: #93c5fd;
    font-size: 12px;
    flex-shrink: 0;
}
.video-main-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, rgba(59,130,246,0.3), rgba(99,102,241,0.3));
    border: 1px solid rgba(99,102,241,0.5);
    color: #93c5fd;
    font-size: 13px;
    font-weight: 600;
    padding: 10px 18px;
    border-radius: 10px;
    transition: var(--transition);
    width: fit-content;
}
.video-main-link:hover {
    background: linear-gradient(135deg, rgba(59,130,246,0.5), rgba(99,102,241,0.5));
    color: white;
    border-color: rgba(99,102,241,0.8);
    transform: translateY(-1px);
}

/* 缩略图列表 */
.video-thumbs {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 12px;
    margin-bottom: 20px;
}
.vthumb {
    cursor: pointer;
    border-radius: 14px;
    overflow: hidden;
    border: 2px solid rgba(255,255,255,0.07);
    background: rgba(255,255,255,0.04);
    transition: all 0.3s ease;
}
.vthumb:hover {
    border-color: rgba(99,102,241,0.5);
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.4);
}
.vthumb.active {
    border-color: var(--indigo);
    box-shadow: 0 0 0 3px rgba(99,102,241,0.25);
}
.vthumb-img {
    position: relative;
    aspect-ratio: 16/9;
    display: flex; align-items: center; justify-content: center;
    overflow: hidden;
}

/* 各品牌背景色 */
.vthumb-img-m9 { background: linear-gradient(135deg, #1a2540, #2d3a6b); }
.vthumb-img-l9 { background: linear-gradient(135deg, #1a2a1a, #2a4a2a); }
.vthumb-img-x9 { background: linear-gradient(135deg, #1a1a2e, #16213e); }
.vthumb-img-u9 { background: linear-gradient(135deg, #2a1a0a, #4a2a10); }
.vthumb-img-mxj { background: linear-gradient(135deg, #2a2015, #4a3820); }
.vthumb-img-009 { background: linear-gradient(135deg, #0f2a2a, #1a4040); }

.vthumb-overlay {
    position: absolute; inset: 0;
    background: rgba(0,0,0,0.35);
    display: flex; align-items: center; justify-content: center;
    opacity: 0;
    transition: var(--transition);
}
.vthumb-overlay i { font-size: 24px; color: white; }
.vthumb:hover .vthumb-overlay,
.vthumb.active .vthumb-overlay { opacity: 1; }
.vthumb.active .vthumb-overlay { background: rgba(99,102,241,0.3); }

.vthumb-logo {
    font-size: 32px;
    color: rgba(255,255,255,0.2);
    transition: var(--transition);
    z-index: 1;
}
.vthumb:hover .vthumb-logo { color: rgba(255,255,255,0.35); }

/* 品牌特色图标颜色 */
.vthumb-img-m9 .vthumb-logo { color: rgba(100,140,255,0.35); }
.vthumb-img-l9 .vthumb-logo { color: rgba(100,200,100,0.35); }
.vthumb-img-x9 .vthumb-logo { color: rgba(120,160,255,0.35); }
.vthumb-img-u9 .vthumb-logo { color: rgba(220,160,60,0.45); }
.vthumb-img-mxj .vthumb-logo { color: rgba(180,140,80,0.4); }
.vthumb-img-009 .vthumb-logo { color: rgba(60,200,200,0.4); }

.vthumb-info {
    padding: 10px 12px;
}
.vthumb-brand {
    font-size: 10px;
    color: rgba(255,255,255,0.35);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 2px;
}
.vthumb-name {
    font-size: 13px;
    font-weight: 700;
    color: white;
    margin-bottom: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.vthumb-type {
    font-size: 11px;
    color: rgba(255,255,255,0.35);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.video-note {
    text-align: center;
    color: rgba(255,255,255,0.25);
    font-size: 12px;
    display: flex; align-items: center; gap: 6px;
    justify-content: center;
}

/* 视频区响应式 */
@media (max-width: 1024px) {
    .video-main-wrap {
        grid-template-columns: 1fr;
    }
    .video-main-info {
        padding: 24px;
    }
    .video-thumbs {
        grid-template-columns: repeat(3, 1fr);
    }
}
@media (max-width: 640px) {
    .video-thumbs {
        grid-template-columns: repeat(2, 1fr);
    }
    .video-main-title { font-size: 18px; }
}