/* 美益快保 · 爱车管家 首页样式 2026-09 · C 端改版（高端极简） */
:root {
    /* 中性墨色阶（替代原品牌深蓝，更消费更高级） */
    --ink-1: #111111;
    --ink-2: #2a2a2a;
    --ink-3: #5c5c5c;
    --ink-4: #9b9b9b;

    /* 背景三阶（大量留白） */
    --bg: #ffffff;
    --bg-soft: #f7f7f7;
    --bg-tint: #fafafa;

    /* 分隔线/边框 */
    --line: #ececec;
    --line-strong: #d6d6d6;

    /* 暖橙点缀（仅用于价格/主 CTA/关键数字/hover） */
    --accent: #f97316;
    --accent-2: #ea580c;
    --accent-dim: #fff4ea;

    /* 状态色（仅用于数据状态） */
    --ok: #10b981;
    --warn: #d97706;
    --bad: #dc2626;

    /* 兼容旧名（保留以不破坏历史模块，逐步收敛） */
    --brand-dark: var(--ink-1);
    --brand-blue: var(--ink-1);
    --brand-gold: var(--accent);
    --brand-gold-hover: var(--accent-2);
    --text: var(--ink-2);
    --text-light: var(--ink-3);
    --bg-light: var(--bg-soft);
    --bg-dark: var(--ink-1);
    --white: #ffffff;
    --radius: 14px;
    --shadow: 0 4px 24px rgba(17, 17, 17, 0.04);
    --shadow-hover: 0 10px 36px rgba(17, 17, 17, 0.08);
    --max-width: 1200px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Inter", "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    color: var(--text);
    line-height: 1.7;
    background: var(--white);
    -webkit-font-smoothing: antialiased;
}

a {
    color: inherit;
    text-decoration: none;
}

.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* 顶部导航 */
.topbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(17, 17, 17, 0.72);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    height: 92px;
}

.topbar-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 20px;
    color: var(--brand-dark);
}

.brand-icon {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--brand-gold), var(--brand-gold-hover));
    color: var(--brand-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: 800;
}

.login-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 9px 20px;
    border-radius: 999px;
    background: var(--brand-dark);
    color: var(--white);
    font-size: 14px;
    font-weight: 500;
    transition: all 0.25s ease;
}

.login-btn:hover {
    background: var(--brand-blue);
    transform: translateY(-1px);
}

.login-btn .icon {
    width: 18px;
    height: 18px;
    fill: currentColor;
}

/* Hero */
.hero {
    position: relative;
    min-height: 92vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 120px 24px 80px;
    overflow: hidden;
    background: linear-gradient(135deg, #0b132b 0%, #1a3a6e 50%, #0f1b3a 100%);
    color: var(--white);
}

.hero-bg {
    position: absolute;
    inset: 0;
    opacity: 0.12;
    background-image:
        radial-gradient(circle at 20% 30%, rgba(242, 182, 50, 0.35) 0%, transparent 40%),
        radial-gradient(circle at 80% 70%, rgba(255, 255, 255, 0.1) 0%, transparent 35%);
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 880px;
}

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    border: 1px solid rgba(242, 182, 50, 0.5);
    border-radius: 999px;
    color: var(--brand-gold);
    font-size: 13px;
    letter-spacing: 1px;
    margin-bottom: 24px;
}

.hero h1 {
    font-size: clamp(32px, 6vw, 56px);
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 20px;
    letter-spacing: 1px;
}

.hero-sub {
    font-size: clamp(18px, 2.5vw, 24px);
    color: var(--brand-gold);
    font-weight: 500;
    margin-bottom: 24px;
}

.hero-desc {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.82);
    max-width: 720px;
    margin: 0 auto 36px;
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    border-radius: 999px;
    font-size: 15px;
    font-weight: 600;
    transition: all 0.25s ease;
    border: 2px solid transparent;
    cursor: pointer;
}

.btn-primary {
    background: var(--brand-gold);
    color: var(--brand-dark);
    border-color: var(--brand-gold);
}

.btn-primary:hover {
    background: var(--brand-gold-hover);
    border-color: var(--brand-gold-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(242, 182, 50, 0.25);
}

.btn-outline {
    background: transparent;
    color: var(--white);
    border-color: rgba(255, 255, 255, 0.5);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--white);
}

.btn-lg {
    padding: 16px 40px;
    font-size: 16px;
}

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

.section-light {
    background: var(--white);
}

.section-dark {
    background: var(--bg-dark);
    color: var(--white);
}

/* ⚠ 禁止在此用链式 var（var(--x) 内再套 var 会导致 gradient 解析失败→背景透明→白字不可见） */
.section-gradient {
    background: linear-gradient(135deg, #1a1a1a, #0a0a0a);
    color: var(--white);
}

/* 白底段（此前未定义，导致部分区域透明、层次缺失） */
.section-white {
    background: #ffffff;
}

.section-header {
    text-align: center;
    max-width: 760px;
    margin: 0 auto 60px;
}

.section-header.light h2,
.section-header.light .section-lead {
    color: var(--white);
}

.section-tag {
    display: inline-block;
    padding: 4px 14px;
    border-radius: 999px;
    background: rgba(242, 182, 50, 0.12);
    color: var(--brand-gold-hover);
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 16px;
    letter-spacing: 1px;
}

.section-dark .section-tag,
.section-gradient .section-tag {
    background: rgba(242, 182, 50, 0.2);
    color: var(--brand-gold);
}

.section-header h2 {
    font-size: clamp(26px, 4vw, 36px);
    font-weight: 700;
    margin-bottom: 18px;
    color: var(--brand-dark);
}

.section-lead {
    font-size: 17px;
    color: var(--text-light);
    line-height: 1.8;
}

/* Value Grid */
.value-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.value-card {
    background: var(--bg-light);
    border-radius: var(--radius);
    padding: 34px 26px;
    text-align: center;
    transition: all 0.3s ease;
    border: 1px solid rgba(15, 27, 58, 0.05);
}

.value-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
}

.value-icon {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.value-icon svg {
    width: 32px;
    height: 32px;
    fill: var(--white);
}

.value-icon-blue {
    background: var(--brand-blue);
}

.value-icon-gold {
    background: var(--brand-gold);
}

.value-icon-gold svg {
    fill: var(--brand-dark);
}

.value-card h3 {
    font-size: 18px;
    margin-bottom: 12px;
    color: var(--brand-dark);
}

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

/* Feature Row */
.feature-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.feature-item {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius);
    padding: 34px 24px;
    transition: all 0.3s ease;
}

.feature-item:hover {
    background: rgba(255, 255, 255, 0.09);
    transform: translateY(-4px);
}

.feature-num {
    font-size: 13px;
    font-weight: 700;
    color: var(--brand-gold);
    margin-bottom: 14px;
    letter-spacing: 1px;
}

.feature-item h3 {
    font-size: 18px;
    margin-bottom: 12px;
    font-weight: 600;
}

.feature-item p {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.72);
    line-height: 1.7;
}

/* Warranty Grid */
.warranty-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.warranty-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 34px 28px;
    box-shadow: var(--shadow);
    border-top: 4px solid var(--brand-gold);
    transition: all 0.3s ease;
}

.warranty-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.warranty-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 18px;
    font-weight: 700;
    color: var(--brand-dark);
    margin-bottom: 16px;
}

.warranty-title svg {
    width: 24px;
    height: 24px;
    fill: var(--brand-gold);
}

.warranty-card p {
    font-size: 15px;
    color: var(--text-light);
    line-height: 1.8;
}

/* Digital List */
.digital-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.digital-item {
    display: flex;
    gap: 18px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius);
    padding: 28px;
    transition: all 0.3s ease;
}

.digital-item:hover {
    background: rgba(255, 255, 255, 0.12);
}

.digital-icon {
    flex-shrink: 0;
    width: 52px;
    height: 52px;
    border-radius: 12px;
    background: var(--brand-gold);
    display: flex;
    align-items: center;
    justify-content: center;
}

.digital-icon svg {
    width: 28px;
    height: 28px;
    fill: var(--brand-dark);
}

.digital-body h3 {
    font-size: 17px;
    margin-bottom: 8px;
    font-weight: 600;
}

.digital-body p {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.78);
    line-height: 1.7;
}

/* Standard Grid */
.standard-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.standard-card {
    background: var(--bg-light);
    border-radius: var(--radius);
    padding: 32px 28px;
    border: 1px solid rgba(15, 27, 58, 0.06);
}

.standard-card h3 {
    font-size: 18px;
    color: var(--brand-dark);
    margin-bottom: 18px;
    padding-bottom: 14px;
    border-bottom: 2px solid var(--brand-gold);
    display: inline-block;
}

.standard-card ul {
    list-style: none;
}

.standard-card li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 12px;
    font-size: 15px;
    color: var(--text-light);
}

.standard-card li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 10px;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--brand-gold);
}

/* Two Col */
.two-col {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 28px;
}

.two-col-card {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius);
    padding: 34px;
}

.two-col-head {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 22px;
    color: var(--brand-gold);
}

.two-col-head svg {
    width: 28px;
    height: 28px;
    fill: var(--brand-gold);
}

.two-col-card ul {
    list-style: none;
}

.two-col-card li {
    position: relative;
    padding-left: 22px;
    margin-bottom: 14px;
    font-size: 15px;
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.7;
}

.two-col-card li::before {
    content: "✓";
    position: absolute;
    left: 0;
    top: 0;
    color: var(--brand-gold);
    font-weight: 700;
}

/* Brand Statement */
.section-brand {
    background: var(--bg-light);
    text-align: center;
    padding: 110px 0;
}

.brand-statement {
    max-width: 820px;
}

.brand-statement h2 {
    font-size: clamp(26px, 4vw, 36px);
    color: var(--brand-dark);
    margin-bottom: 24px;
}

.brand-quote {
    font-size: 19px;
    color: var(--text);
    line-height: 1.9;
    margin-bottom: 22px;
    font-weight: 500;
}

.brand-statement p {
    font-size: 16px;
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 36px;
}

.brand-statement strong {
    color: var(--brand-blue);
}

/* Footer */
.site-footer {
    background: var(--brand-dark);
    color: rgba(255, 255, 255, 0.7);
    padding: 56px 0 36px;
    text-align: center;
    font-size: 14px;
}

/* footer 顶部 logo 行（深底白字 logo 显示完整中文） */
.footer-logo-row {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 0 40px;
    margin-bottom: 32px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.footer-logo-row .brand-logo-img-full {
    height: 44px;
    width: 110px;
}

.site-footer a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: underline;
}

.footer-small {
    margin-top: 8px;
    font-size: 13px;
    color: rgba(255, 255, 255, 0.5);
}

/* Responsive */
@media (max-width: 1024px) {
    .value-grid,
    .feature-row,
    .warranty-grid,
    .digital-list,
    .standard-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .topbar {
        height: 56px;
    }

    .brand-text {
        font-size: 17px;
    }

    .login-btn {
        padding: 7px 14px;
        font-size: 13px;
    }

    .hero {
        min-height: auto;
        padding: 100px 20px 60px;
    }

    .section {
        padding: 70px 0;
    }

    .value-grid,
    .feature-row,
    .warranty-grid,
    .digital-list,
    .standard-grid,
    .two-col {
        grid-template-columns: 1fr;
    }

    .digital-item {
        flex-direction: column;
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 280px;
    }
}

/* ===== 2026-09 · C 端改版组件（爱车管家 / OBD） ===== */

/* 顶部导航 */
.topbar-nav {
    display: flex;
    align-items: center;
    gap: 26px;
}
.topbar-nav a {
    font-size: 15px;
    color: rgba(255, 255, 255, 0.82);
    transition: color .2s;
}
.topbar-nav a:hover { color: var(--brand-gold); }
.topbar-nav .login-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 16px;
    border: 1px solid rgba(255, 255, 255, 0.28);
    border-radius: 999px;
    font-size: 14px;
}
.topbar-nav .login-btn .icon {
    width: 16px;
    height: 16px;
    fill: currentColor;
}

/* 首屏双栏 */
.hero-c { padding: 96px 0 88px; }
/* ===== 首屏 v3：人物图为主视觉（用户要求放最上面） ===== */
.hero-content-c {
    display: grid !important;       /* 覆盖 .hero-content 默认无 grid */
    max-width: none !important;   /* 覆盖 .hero-content max-width:880px */
    grid-template-columns: 1fr 1.1fr !important;
    gap: 56px;
    align-items: center;
    padding-top: 40px;
    padding-bottom: 40px;
    position: relative;
    z-index: 2;
}
.hero-copy h1 { font-size: 54px; line-height: 1.2; }
.hero-points {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 26px;
}
.hero-points li {
    padding: 5px 14px;
    border: 1px solid rgba(242, 182, 50, 0.5);
    border-radius: 999px;
    color: var(--brand-gold);
    font-size: 13px;
    background: rgba(242, 182, 50, 0.08);
}
.hero-qr { text-align: center; }
.qr-frame {
    width: 220px;
    height: 220px;
    margin: 0 auto;
    padding: 12px;
    background: var(--white);
    border-radius: 16px;
    box-shadow: 0 18px 44px rgba(0, 0, 0, 0.28);
}
.qr-placeholder {
    width: 100%;
    height: 100%;
    border: 2px dashed #c8d0dd;
    border-radius: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    color: #8b95a6;
    font-size: 15px;
    background: #f7f9fc;
}
.qr-placeholder small { font-size: 12px; color: #a7b0bf; }
.qr-placeholder.small { height: 180px; }
.qr-tip { margin-top: 14px; color: rgba(255, 255, 255, 0.8); font-size: 14px; }

/* 三步 */
.step-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}
.step-item {
    background: var(--white);
    border-radius: var(--radius);
    padding: 34px 28px;
    box-shadow: var(--shadow);
    transition: transform .25s, box-shadow .25s;
}
.step-item:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.step-num {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--brand-blue);
    color: var(--white);
    font-size: 20px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
}
.step-item h3 { font-size: 19px; margin-bottom: 8px; }
.step-item p { color: var(--text-light); font-size: 15px; }

/* 检测能力 */
.metric-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 22px;
}
.metric-card {
    background: var(--bg-light);
    border-radius: var(--radius);
    padding: 28px 24px;
    border: 1px solid #eef2f7;
}
.metric-icon { font-size: 30px; margin-bottom: 12px; }
.metric-card h3 { font-size: 18px; margin-bottom: 8px; }
.metric-card p { font-size: 14.5px; color: var(--text-light); }
.metric-more {
    margin-top: 26px;
    text-align: center;
    color: var(--text-light);
    font-size: 15px;
}
.metric-more strong { color: var(--brand-blue); }

/* 成长叙事 */
.growth {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 52px;
    align-items: start;
}
.timeline { position: relative; padding-left: 26px; }
.timeline::before {
    content: '';
    position: absolute;
    left: 6px;
    top: 8px;
    bottom: 8px;
    width: 2px;
    background: linear-gradient(180deg, var(--brand-gold), rgba(242, 182, 50, 0.15));
}
.tl-item { position: relative; padding-bottom: 26px; }
.tl-dot {
    position: absolute;
    left: -26px;
    top: 7px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--brand-gold);
    box-shadow: 0 0 0 4px rgba(242, 182, 50, 0.18);
}
.tl-body h4 { font-size: 17px; margin-bottom: 6px; color: var(--white); }
.tl-body p { font-size: 14.5px; color: rgba(255, 255, 255, 0.72); }
.value-anchors { display: flex; flex-direction: column; gap: 16px; }
.anchor-card {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: var(--radius);
    padding: 22px 24px;
}
.anchor-card h3 { font-size: 18px; color: var(--white); margin-bottom: 6px; }
.anchor-card p { font-size: 14.5px; color: rgba(255, 255, 255, 0.72); }
.anchor-tag {
    display: inline-block;
    font-size: 12px;
    padding: 2px 10px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.14);
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 10px;
}
.anchor-tag.anchor-gold { background: rgba(242, 182, 50, 0.2); color: var(--brand-gold); }

/* 购买卡 */
.buy-card {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 44px;
    background: var(--white);
    border-radius: 18px;
    padding: 48px;
    box-shadow: 0 24px 60px rgba(11, 19, 43, 0.16);
}
.buy-price {
    font-size: 62px;
    font-weight: 800;
    color: var(--brand-dark);
    line-height: 1.1;
    margin: 10px 0 4px;
}
.buy-price .cur { font-size: 28px; vertical-align: super; }
.buy-price em { font-size: 18px; font-style: normal; color: var(--text-light); font-weight: 500; }
.buy-sub { color: var(--text-light); margin-bottom: 22px; }
.buy-list { list-style: none; margin-bottom: 30px; }
.buy-list li { font-size: 15.5px; margin-bottom: 10px; }
.buy-note { margin-top: 12px; font-size: 13px; color: var(--text-light); }
.device-visual { text-align: center; }
.device-box {
    width: 220px;
    height: 150px;
    margin: 0 auto;
    border-radius: 14px;
    background: linear-gradient(145deg, #1c2b52, #0f1b3a);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--brand-gold);
    font-weight: 700;
    letter-spacing: 2px;
    box-shadow: 0 20px 40px rgba(15, 27, 58, 0.28);
}
.device-led {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #4ade80;
    box-shadow: 0 0 12px #4ade80;
    margin-bottom: 12px;
}
.device-cap { margin-top: 14px; font-size: 13px; color: var(--text-light); }

/* 案例 */
.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.case-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 28px 26px;
    box-shadow: var(--shadow);
}
.case-head { font-size: 17px; font-weight: 700; margin-bottom: 12px; }
.case-icon { margin-right: 6px; }
.case-data { color: var(--brand-blue); font-size: 14.5px; margin-bottom: 10px; }
.case-text { font-size: 14.5px; color: var(--text-light); }
.case-more { margin-top: 24px; text-align: center; }
.case-more a { color: var(--brand-blue); font-size: 15px; }

/* 数据主权 */
.pledge-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.pledge-item {
    padding: 24px;
    border-left: 3px solid var(--brand-gold);
    background: var(--bg-light);
    border-radius: 8px;
}
.pledge-item h4 { font-size: 16px; margin-bottom: 6px; }
.pledge-item p { font-size: 14px; color: var(--text-light); }
.pledge-more { margin-top: 24px; text-align: center; font-size: 15px; }
.pledge-more a { color: var(--brand-blue); }

/* FAQ */
.faq { max-width: 860px; margin: 0 auto; }
.faq-item {
    background: var(--white);
    border: 1px solid #eef2f7;
    border-radius: var(--radius);
    margin-bottom: 12px;
    overflow: hidden;
}
.faq-item summary {
    padding: 18px 24px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    list-style: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
    content: '＋';
    float: right;
    color: var(--brand-blue);
}
.faq-item[open] summary::after { content: '－'; }
.faq-item p {
    padding: 0 24px 20px;
    color: var(--text-light);
    font-size: 15px;
}

/* 底部 CTA */
.final-cta { text-align: center; }
.final-cta h2 { font-size: 34px; margin-bottom: 10px; }
.final-cta p { margin-bottom: 26px; opacity: .9; }
.final-cta .hero-actions { justify-content: center; }

/* 弹层 */
.modal { position: fixed; inset: 0; z-index: 999; display: flex; align-items: center; justify-content: center; }
.modal[hidden] { display: none; }
.modal-mask { position: absolute; inset: 0; background: rgba(6, 12, 28, .68); }
.modal-body {
    position: relative;
    width: 92%;
    max-width: 420px;
    background: var(--white);
    border-radius: 16px;
    padding: 34px 30px;
    text-align: center;
    box-shadow: 0 30px 70px rgba(0, 0, 0, .3);
}
.modal-close {
    position: absolute;
    right: 14px;
    top: 10px;
    border: none;
    background: none;
    font-size: 26px;
    color: #9aa3b2;
    cursor: pointer;
}
.modal-body h3 { font-size: 22px; margin-bottom: 6px; }
.modal-sub { color: var(--brand-gold); font-size: 14.5px; margin-bottom: 20px; }
.modal-qr { width: 200px; margin: 0 auto 18px; }
.modal-tip { font-size: 14px; color: var(--text-light); }

/* 页脚 */
.footer-inner {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 32px;
    padding-bottom: 28px;
}
.footer-col h4 { font-size: 16px; margin-bottom: 12px; color: var(--white); }
.footer-col p, .footer-col a {
    display: block;
    font-size: 14px;
    color: rgba(255, 255, 255, .68);
    margin-bottom: 8px;
}
.footer-col a:hover { color: var(--brand-gold); }

@media (max-width: 900px) {
    .hero-content-c,
    .growth,
    .buy-card { grid-template-columns: 1fr; gap: 32px; }
    .hero-copy h1 { font-size: 36px; }
    .step-row,
    .metric-grid,
    .case-grid,
    .pledge-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-inner { grid-template-columns: 1fr 1fr; }
    .buy-card { padding: 30px 22px; }
    .topbar-nav { gap: 14px; }
    .topbar-nav a { font-size: 13px; }
}

@media (max-width: 640px) {
    .step-row,
    .metric-grid,
    .case-grid,
    .pledge-grid,
    .footer-inner { grid-template-columns: 1fr; }
    .hero-c { padding: 60px 0 48px; }
    .qr-frame { width: 180px; height: 180px; }
}

/* ===== 2026-09 v2 · C 端改版组件升级（去除 emoji / 高端极简） ===== */

/* SVG 线性图标（24×24 / 1.5 描边 / 圆角端点，呼应产品图工业感） */
.icon-svg {
    display: inline-block;
    width: 1em;
    height: 1em;
    vertical-align: -0.15em;
    fill: none;
    stroke: currentColor;
    stroke-width: 1.5;
    stroke-linecap: round;
    stroke-linejoin: round;
    flex-shrink: 0;
}
.icon-svg-lg { width: 1.4em; height: 1.4em; }
.icon-svg-xl { width: 2em; height: 2em; }

/* 顶部导航 · 加 logo 区与菜单 */
.topbar-inner-c {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
    padding: 18px 0;
}
.brand-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--ink-1);
    font-weight: 700;
    font-size: 17px;
    letter-spacing: 0.5px;
}
.brand-logo-mark {
    height: 56px;
    width: 130px;
    display: inline-block;
    background: url('../img/logo_mycar_icon.png') no-repeat center / contain;
    flex-shrink: 0;
}
.brand-logo-img-full {
    height: 36px;
    width: auto;
    max-width: 200px;
    display: inline-block;
    background: url('../img/logo_mycar_full.png') no-repeat center / contain;
    flex-shrink: 0;
}
.brand-logo small {
    font-size: 11px;
    color: var(--ink-3);
    font-weight: 400;
    letter-spacing: 1px;
    margin-left: 4px;
}

/* 首屏主调升级：黑底大字 + 大留白 */
.hero-c { background: var(--ink-1); color: #fff; position: relative; overflow: hidden; }
.hero-c .hero-points li {
    border-color: rgba(255, 255, 255, 0.22);
    color: rgba(255, 255, 255, 0.86);
    background: rgba(255, 255, 255, 0.06);
}
.hero-c .hero-points li:hover {
    border-color: var(--accent);
    color: var(--accent);
}
.hero-c .btn-outline {
    border-color: rgba(255, 255, 255, 0.4);
    color: #fff;
}
.hero-c .btn-outline:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: #fff;
}
.hero-c .hero-sub,
.hero-c .hero-desc {
    color: rgba(255, 255, 255, 0.72);
}
.hero-c .hero-badge {
    background: rgba(255, 255, 255, 0.08);
    color: rgba(255, 255, 255, 0.86);
    border: 1px solid rgba(255, 255, 255, 0.16);
}

/* 首屏右栏：真图 + 注解（替代占位方框） */
.qr-frame {
    background: #fff;
    border-radius: 18px;
    padding: 14px;
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
}
.qr-frame img {
    display: block;
    width: 100%;
    height: auto;
    border-radius: 10px;
}
.qr-tip {
    color: rgba(255, 255, 255, 0.6);
    font-size: 13px;
    margin-top: 16px;
    letter-spacing: 1px;
}

/* metric 卡（去除 emoji 容器，改成 SVG） */
.metric-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: var(--bg-soft);
    color: var(--ink-1);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-bottom: 18px;
}
.metric-card {
    border: 1px solid var(--line);
    background: #fff;
    border-radius: 16px;
    padding: 28px 24px;
    transition: border-color .2s, transform .2s, box-shadow .2s;
}
.metric-card:hover {
    border-color: var(--ink-1);
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

/* buy 列表：SVG check-shield 替代 ✅ */
.buy-list {
    list-style: none;
    padding: 0;
    margin: 18px 0 28px;
}
.buy-list li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 8px 0;
    color: var(--ink-2);
    font-size: 15px;
}
.buy-list .icon-svg {
    color: var(--accent);
    margin-top: 4px;
}

/* buy 卡右侧：真机图（替代 CSS 画的方块） */
.buy-right {
    display: flex;
    align-items: center;
    justify-content: center;
}
.buy-right img {
    width: 100%;
    max-width: 380px;
    height: auto;
    filter: drop-shadow(0 20px 50px rgba(0, 0, 0, 0.18));
    border-radius: 12px;
}

/* case 卡：SVG 图标替代 emoji */
.case-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 8px;
    background: var(--ink-1);
    color: #fff;
    font-size: 14px;
    margin-right: 10px;
    vertical-align: -2px;
}

/* 价值锚：高端感（黑底大字 + 暖橙标签） */
.section-dark {
    background: var(--ink-1);
    color: #fff;
}
.section-dark .section-lead { color: rgba(255, 255, 255, 0.6); }
.anchor-tag {
    background: var(--accent-dim);
    color: var(--accent-2);
    border: none;
}
.anchor-card {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 28px;
    transition: background .2s, border-color .2s;
}
.anchor-card:hover {
    background: rgba(255, 255, 255, 0.07);
    border-color: rgba(255, 255, 255, 0.2);
}
.anchor-card h3 { color: #fff; }
.anchor-card p { color: rgba(255, 255, 255, 0.65); }

/* 时间轴升级 */
.timeline { position: relative; padding-left: 28px; }
.timeline::before {
    content: '';
    position: absolute;
    left: 11px; top: 12px; bottom: 12px;
    width: 1px;
    background: rgba(255, 255, 255, 0.18);
}
.tl-dot {
    position: absolute;
    left: -28px; top: 8px;
    width: 14px; height: 14px;
    border-radius: 50%;
    background: var(--accent);
    border: 3px solid var(--ink-1);
    box-shadow: 0 0 0 1px rgba(249, 115, 22, 0.3);
}
.tl-item { position: relative; padding-bottom: 32px; }
.tl-item:last-child { padding-bottom: 0; }
.tl-body h4 { color: #fff; }
.tl-body p { color: rgba(255, 255, 255, 0.6); }

/* step 数字（原风格保留，色调整） */
.step-num {
    background: var(--ink-1);
    color: #fff;
    border: none;
    box-shadow: 0 4px 12px rgba(17, 17, 17, 0.15);
}
.step-item {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 16px;
    padding: 32px 24px;
    transition: border-color .2s, transform .2s;
}
.step-item:hover {
    border-color: var(--ink-1);
    transform: translateY(-2px);
}

/* 数据主权卡片 */
.pledge-item {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 24px;
    transition: border-color .2s;
}
.pledge-item:hover { border-color: var(--ink-1); }
.pledge-item h4 {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--ink-1);
}

/* FAQ */
.faq-list { border-top: 1px solid var(--line); }
.faq-item {
    border-bottom: 1px solid var(--line);
    padding: 20px 0;
}
.faq-item h4 {
    color: var(--ink-1);
    font-size: 16px;
    font-weight: 600;
}
.faq-item p {
    color: var(--ink-3);
    font-size: 14px;
    margin-top: 8px;
}

/* footer 升级 */
.site-footer-c {
    background: var(--ink-1);
    color: rgba(255, 255, 255, 0.6);
}
.site-footer-c a { color: rgba(255, 255, 255, 0.6); }
.site-footer-c a:hover { color: #fff; }
.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 24px;
    margin-top: 32px;
    font-size: 12px;
    color: rgba(255, 255, 255, 0.4);
}

/* 真实使用场景屏 */
.section-soft { background: var(--bg-soft); }
.scene-grid {
    display: grid;
    grid-template-columns: 1.1fr 1fr;
    gap: 64px;
    align-items: center;
}
.scene-photo {
    border-radius: 16px;
    overflow: hidden;
    background: #fff;
    box-shadow: var(--shadow);
}
.scene-photo img {
    display: block;
    width: 100%;
    height: auto;
}
.scene-copy h2 { font-size: 38px; line-height: 1.25; }
.scene-points {
    list-style: none;
    margin-top: 28px;
    padding: 0;
}
.scene-points li {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 0;
    border-bottom: 1px solid var(--line);
    color: var(--ink-2);
    font-size: 15px;
}
.scene-points li:last-child { border-bottom: 0; }
.scene-points .icon-svg {
    width: 22px;
    height: 22px;
    color: var(--accent);
    flex-shrink: 0;
}

@media (max-width: 900px) {
    .scene-grid { grid-template-columns: 1fr; gap: 36px; }
    .scene-copy h2 { font-size: 28px; }
}

/* 首屏 hero 背景细分（黑色 + 微纹理） */
.hero-c { background: var(--ink-1); color: #fff; }
.hero-c .hero-bg {
    background:
        radial-gradient(1200px 600px at 80% -10%, rgba(249, 115, 22, 0.15), transparent 50%),
        radial-gradient(900px 500px at 10% 100%, rgba(255, 255, 255, 0.04), transparent 50%);
}
.hero-c .hero-points li { color: rgba(255, 255, 255, 0.86); }

/* ===== 首屏 v3：人物图为主视觉（用户要求放最上面） ===== */
.hero-content-c {
    grid-template-columns: 1fr 1.05fr;
    gap: 64px;
    align-items: center;
    padding-top: 40px;
}
.hero-copy h1 {
    font-size: 52px;
    line-height: 1.18;
    letter-spacing: -0.5px;
}
.hero-sub { font-size: 20px; margin-top: 18px; }
.hero-desc { font-size: 15px; margin-top: 14px; max-width: 520px; }

/* 人物主视觉图 */
.hero-visual {
    position: relative;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.5);
    background: #1a1a1a;
}
.hero-visual img {
    display: block;
    width: 100%;
    height: auto;
    object-fit: cover;
}
/* 图上压一层暗角，让白字标签可读（若有） */
.hero-visual::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.35), transparent 45%);
    pointer-events: none;
}

/* 内联小程序码（原独立右栏 → 移入文案区左下） */
.hero-qr-inline {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-top: 32px;
    padding: 14px;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 14px;
    max-width: 380px;
}
.hero-qr-inline .qr-frame {
    width: 84px;
    height: 84px;
    margin: 0;
    padding: 6px;
    flex-shrink: 0;
    box-shadow: none;
    border-radius: 10px;
}
.qr-inline-tip { display: flex; flex-direction: column; gap: 3px; }
.qr-inline-tip strong {
    color: #fff;
    font-size: 14px;
    font-weight: 600;
}
.qr-inline-tip span {
    color: rgba(255, 255, 255, 0.55);
    font-size: 12px;
}

/* 旧独立 QR 栏隐藏（结构已改，保留类名防报错） */
.hero-qr { display: none; }

@media (max-width: 980px) {
    .hero-content-c {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    .hero-copy h1 { font-size: 34px; }
    .hero-visual { order: -1; }
    .hero-qr-inline { max-width: 100%; }
}

/* ================================================================
   v4 · 首屏苹果极简风（2026-09-07）
   全屏人物图铺底 + 左侧留白区细字浮层；去 39 元按钮/去小程序码
   ================================================================ */
.hero-c.hero-full {
    background: #f5f5f7;          /* 图加载前的浅灰兜底（苹果灰） */
    position: relative;
    overflow: hidden;
    min-height: 640px;
    height: 100vh;
    padding: 0;
    display: block;
}
/* 人物图全屏铺底 */
.hero-full .hero-media {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: right center;  /* 新图人物原就在右侧 → image 右边对齐，脸部推到最右 */
    z-index: 0;
}
/* 左侧文字浮层（落在画面左侧干净浅色区，不遮人物） */
.hero-full .hero-min-c {
    position: relative;
    z-index: 1;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    padding-top: 64px;            /* 留出固定导航高度 */
}
.hero-full .hero-kicker {
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.32em;
    color: rgba(17, 17, 17, 0.55);
    margin-bottom: 20px;
    text-transform: uppercase;
}
.hero-full h1 {
    font-size: clamp(40px, 5vw, 68px);
    font-weight: 200;             /* 极细字（苹果风） */
    line-height: 1.15;
    letter-spacing: 0.5px;
    color: #111;
    margin: 0 0 22px;
    max-width: 560px;
}
.hero-full .hero-sub {
    font-size: clamp(15px, 1.4vw, 19px);
    font-weight: 300;
    line-height: 1.8;
    color: rgba(17, 17, 17, 0.62);
    margin: 0 0 30px;
    max-width: 420px;
}
.hero-full .hero-link {
    font-size: 16px;
    font-weight: 400;
    color: #f97316;
    letter-spacing: 0.2px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding-bottom: 2px;
    border-bottom: 1px solid rgba(249, 115, 22, 0.35);
    transition: border-color .2s, gap .2s;
}
.hero-full .hero-link:hover {
    border-color: #f97316;
    gap: 10px;
}
/* 顶栏恢复白玻璃（配浅色首屏） */
.topbar {
    background: rgba(255, 255, 255, 0.78);
    backdrop-filter: blur(22px) saturate(180%);
    -webkit-backdrop-filter: blur(22px) saturate(180%);
    border-bottom: 1px solid rgba(17, 17, 17, 0.08);
}
.topbar-inner-c {
    height: 92px;
    padding: 0;
}
.topbar-nav a {
    color: rgba(17, 17, 17, 0.78);
}
.topbar-nav a:hover { color: #111; }
.topbar-nav .login-btn {
    background: #ffffff;
    border: 1px solid rgba(17, 17, 17, 0.18);
    color: #111;
    transition: border-color .2s, background .2s, color .2s;
}
.topbar-nav .login-btn:hover {
    background: #f5f5f7;
    border-color: #111;
}
/* 滚动经过深色屏时导航仍可读（后续 section 深色，白玻璃足矣） */
.topbar.topbar-dark {
    background: rgba(17, 17, 17, 0.92);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    backdrop-filter: blur(16px) saturate(180%);
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}
.topbar.topbar-dark .topbar-nav a { color: rgba(255, 255, 255, 0.85); }
.topbar.topbar-dark .topbar-nav a:hover { color: #fff; }
.topbar.topbar-dark .topbar-nav .login-btn {
    background: rgba(255, 255, 255, 0.10);
    border: 1px solid rgba(255, 255, 255, 0.30);
    color: #fff;
}
.topbar.topbar-dark .topbar-nav .login-btn:hover {
    background: rgba(255, 255, 255, 0.18);
    border-color: #fff;
}

/* 移动端：图与文字上下排布，避免文字压人物 */
@media (max-width: 860px) {
    .hero-c.hero-full {
        height: auto;
        min-height: 0;
        display: flex;
        flex-direction: column;
    }
    .hero-full .hero-media {
        position: static;
        order: 2;
        height: auto;
        aspect-ratio: 16 / 11;
        object-fit: cover;
        object-position: center 20%;
    }
    .hero-full .hero-min-c {
        order: 1;
        padding: 96px 24px 44px;
        height: auto;
    }
    .hero-full h1 { font-size: 38px; }
    .hero-full .hero-sub { font-size: 15px; }
}

/* ===== 2026-09-15 · 手机端优化（导航错位 + 间距 + 字号） ===== */

/* 桌面端隐藏汉堡按钮 */
.nav-toggle { display: none; }

@media (max-width: 768px) {
    /* 顶栏高度统一：inner 不再 92px 溢出 56px 固定条，避免导航压到首屏 */
    .topbar { height: 56px; }
    .topbar-inner-c {
        height: 56px;
        padding: 0;
        gap: 12px;
    }
    .brand-logo-mark { height: 40px; width: 96px; }

    /* 汉堡按钮（仅移动端显示） */
    .nav-toggle {
        display: inline-flex;
        flex-direction: column;
        justify-content: center;
        gap: 5px;
        width: 40px;
        height: 40px;
        margin-left: auto;
        padding: 0;
        background: none;
        border: none;
        cursor: pointer;
    }
    .nav-toggle span {
        display: block;
        width: 22px;
        height: 2px;
        border-radius: 2px;
        background: #111;
        transition: transform .25s, opacity .25s;
    }
    .topbar.topbar-dark .nav-toggle span { background: #fff; }
    /* 展开态：汉堡变 X */
    .topbar.open .nav-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
    .topbar.open .nav-toggle span:nth-child(2) { opacity: 0; }
    .topbar.open .nav-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

    /* 导航默认收起，点开后下拉面板（仅带 has-toggle 的顶栏生效，避免影响未加汉堡的子页） */
    .topbar.has-toggle .topbar-nav {
        position: absolute;
        top: 56px;
        left: 0;
        right: 0;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        border-bottom: 1px solid rgba(17, 17, 17, 0.08);
        box-shadow: 0 12px 30px rgba(0, 0, 0, 0.08);
        max-height: 0;
        overflow: hidden;
        transition: max-height .28s ease;
    }
    .topbar.has-toggle.open .topbar-nav { max-height: 460px; }
    .topbar.has-toggle .topbar-nav a {
        padding: 15px 22px;
        font-size: 15px;
        color: rgba(17, 17, 17, 0.82);
        border-bottom: 1px solid rgba(17, 17, 17, 0.05);
    }
    .topbar.has-toggle .topbar-nav a:hover { color: #111; }
    .topbar.has-toggle .topbar-nav .login-btn {
        margin: 12px 22px;
        justify-content: center;
        border: 1px solid rgba(17, 17, 17, 0.18);
        background: #fff;
        color: #111;
        border-radius: 999px;
    }

    /* 段落间距收窄，减少手机端过长留白 */
    .section { padding: 56px 0; }
    .section-header { margin: 0 auto 40px; }
    .section-header h2 { font-size: 26px; line-height: 1.3; }
    .section-lead { font-size: 15px; }

    /* 首屏文字区 */
    .hero-full .hero-min-c { padding: 84px 22px 40px; }
    .hero-full h1 { font-size: 34px; }

    /* 价格与结尾 CTA 字号收敛 */
    .buy-price { font-size: 48px; }
    .final-cta h2 { font-size: 26px; }
    .final-cta p { font-size: 15px; }

    /* 容器左右留白略减 */
    .container { padding: 0 18px; }

    /* 弹层内边距 */
    .modal-body { padding: 28px 22px; }
}

/* 超小屏进一步收紧 */
@media (max-width: 380px) {
    .hero-full h1 { font-size: 30px; }
    .section-header h2 { font-size: 23px; }
    .buy-price { font-size: 42px; }
    .container { padding: 0 16px; }
}