/* ===== 快喵VPN 官网样式（亮色·蓝色主题·桌面端定位）===== */
:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --accent: #f59e0b;
    --bg: #f8fafc;
    --card: #ffffff;
    --border: #e2e8f0;
    --title: #0f172a;
    --body: #334155;
    --muted: #475569;
    --radius: 16px;
    --shadow: 0 4px 20px rgba(15, 23, 42, 0.06);
    --shadow-lg: 0 12px 40px rgba(37, 99, 235, 0.15);
}

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

html { scroll-behavior: smooth; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Microsoft YaHei", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg);
    color: var(--body);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--primary-dark); text-decoration: none; }
a:hover { color: var(--primary); }
img { max-width: 100%; height: auto; display: block; }
h1, h2, h3, h4 { color: var(--title); line-height: 1.3; }

.container { max-width: 1160px; margin: 0 auto; padding: 0 20px; }

/* ===== 顶部导航 ===== */
.header {
    position: sticky; top: 0; z-index: 1000;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 1.25rem; color: var(--title); }
.brand img { width: 34px; height: 34px; border-radius: 8px; }
.brand span b { color: var(--primary-dark); }
.nav-links { display: flex; align-items: center; gap: 26px; list-style: none; }
.nav-links a { color: var(--body); font-size: 0.95rem; font-weight: 500; }
.nav-links a:hover { color: var(--primary); }
.nav-cta { background: var(--primary); color: #fff !important; padding: 9px 22px; border-radius: 50px; font-weight: 600; }
.nav-cta:hover { background: var(--primary-dark); color: #fff !important; }
.nav-toggle { display: none; background: none; border: 0; font-size: 1.6rem; color: var(--title); cursor: pointer; }

/* ===== Hero（左右分列：左文案右数据面板）===== */
.hero { padding: 64px 0 48px; }
.hero-inner { display: flex; align-items: center; gap: 48px; }
.hero-copy { flex: 1; }
.hero-badge {
    display: inline-block; background: rgba(37, 99, 235, 0.1);
    color: var(--primary-dark); border: 1px solid rgba(37, 99, 235, 0.2);
    padding: 6px 18px; border-radius: 50px; font-size: 0.85rem; font-weight: 600;
    margin-bottom: 22px;
}
.hero-copy h1 { font-size: clamp(2rem, 4.5vw, 3rem); font-weight: 800; margin-bottom: 18px; }
.hero-copy h1 .hl { color: var(--primary-dark); }
.hero-copy .hero-desc { font-size: 1.1rem; color: var(--muted); margin-bottom: 28px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 16px; }
.btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 14px 32px; border-radius: 50px; font-weight: 700; font-size: 1rem;
    transition: transform .15s, box-shadow .15s;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); color: #fff; transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { background: #d97706; color: #fff; transform: translateY(-2px); }
.btn-ghost { background: #fff; color: var(--primary-dark); border: 1.5px solid var(--primary); }
.hero-note { color: var(--muted); font-size: 0.9rem; }
.hero-art { flex: 1; min-width: 0; }
.hero-art img { margin: 0 auto; border-radius: var(--radius); box-shadow: var(--shadow); }

/* ===== 场景卡 ===== */
.scenes { padding: 40px 0; }
.scenes-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.scene-card {
    background: var(--card); border: 1px solid var(--border);
    border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow);
    transition: transform .2s;
}
.scene-card:hover { transform: translateY(-4px); }
.scene-card img { width: 100%; height: auto; }
.scene-card .body { padding: 20px 24px 24px; }
.scene-card h3 { margin-bottom: 8px; font-size: 1.15rem; }
.scene-card p { color: var(--muted); font-size: 0.95rem; }

/* ===== 统计卡 ===== */
.stats { padding: 40px 0; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.stat-card {
    background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
    padding: 26px 20px; text-align: center; box-shadow: var(--shadow);
}
.stat-card .num { font-size: 1.9rem; font-weight: 800; color: var(--primary-dark); }
.stat-card .label { color: var(--muted); font-size: 0.9rem; margin-top: 4px; }

/* ===== 功能卡 ===== */
.features { padding: 48px 0; }
.section-head { text-align: center; margin-bottom: 40px; }
.section-head h2 { font-size: 2rem; font-weight: 800; margin-bottom: 10px; }
.section-head p { color: var(--muted); max-width: 620px; margin: 0 auto; }
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.feature-card {
    background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
    padding: 28px; box-shadow: var(--shadow);
}
.feature-card .icon {
    width: 52px; height: 52px; border-radius: 12px; background: rgba(37, 99, 235, 0.1);
    display: flex; align-items: center; justify-content: center; margin-bottom: 18px;
}
.feature-card .icon svg { width: 26px; height: 26px; stroke: var(--primary-dark); }
.feature-card h3 { margin-bottom: 10px; font-size: 1.15rem; }
.feature-card p { color: var(--muted); font-size: 0.95rem; }

/* ===== 节点区块 ===== */
.nodes { padding: 48px 0; }
.nodes-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.node-card {
    background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
    padding: 22px; box-shadow: var(--shadow);
}
.node-card .city { font-weight: 700; color: var(--title); margin-bottom: 4px; }
.node-card .desc { color: var(--muted); font-size: 0.88rem; }

/* ===== 套餐 ===== */
.pricing { padding: 48px 0; }
.pricing-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; align-items: stretch; }
.plan {
    background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
    padding: 30px 26px; box-shadow: var(--shadow); position: relative;
    display: flex; flex-direction: column;
}
.plan.featured { border: 2px solid var(--primary); box-shadow: var(--shadow-lg); }
.plan .tag {
    position: absolute; top: -13px; left: 50%; transform: translateX(-50%);
    background: var(--accent); color: #fff; font-size: 0.78rem; font-weight: 700;
    padding: 4px 16px; border-radius: 50px;
}
.plan h3 { font-size: 1.2rem; margin-bottom: 6px; }
.plan .price { font-size: 2.4rem; font-weight: 800; color: var(--title); }
.plan .price small { font-size: 1rem; color: var(--muted); font-weight: 500; }
.plan ul { list-style: none; margin: 20px 0 24px; flex: 1; }
.plan li { padding: 7px 0; color: var(--body); font-size: 0.95rem; }
.plan li::before { content: "✓"; color: var(--primary); font-weight: 700; margin-right: 8px; }
.plan .btn { justify-content: center; width: 100%; }

/* ===== 内容正文 ===== */
.content { padding: 48px 0 60px; }
.article { max-width: 820px; margin: 0 auto; }
.article h1 { font-size: 2.1rem; margin-bottom: 16px; }
.article .meta { color: var(--muted); font-size: 0.9rem; margin-bottom: 28px; }
.article h2 { font-size: 1.5rem; margin: 36px 0 14px; }
.article p { margin-bottom: 18px; }
.article img { border-radius: var(--radius); margin: 20px 0; }
.article strong { color: var(--title); }
.article ul, .article ol { margin: 0 0 18px 22px; }
.article li { margin-bottom: 8px; }
.callout {
    background: rgba(37, 99, 235, 0.06); border-left: 4px solid var(--primary);
    padding: 16px 20px; border-radius: 8px; margin: 20px 0;
}

/* ===== 下载矩阵 ===== */
.dl-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.dl-card {
    background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
    padding: 28px; text-align: center; box-shadow: var(--shadow);
}
.dl-card img { width: 84px; height: 84px; margin: 0 auto 16px; border-radius: 20px; }
.dl-card h3 { margin-bottom: 8px; }
.dl-card p { color: var(--muted); font-size: 0.9rem; margin-bottom: 18px; }

/* ===== FAQ ===== */
.faq-list { max-width: 780px; margin: 0 auto; }
.faq-item {
    background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
    margin-bottom: 16px; padding: 22px 26px; box-shadow: var(--shadow);
}
.faq-item h3 { font-size: 1.1rem; margin-bottom: 10px; }
.faq-item p { color: var(--muted); }

/* ===== 页脚 ===== */
.footer { background: #0f172a; color: #cbd5e1; margin-top: 60px; padding: 50px 0 30px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 32px; }
.footer h4 { color: #fff; margin-bottom: 16px; font-size: 1rem; }
.footer ul { list-style: none; }
.footer li { margin-bottom: 10px; }
.footer a { color: #94a3b8; }
.footer a:hover { color: #fff; }
.footer .brand { color: #fff; margin-bottom: 12px; }
.footer .brand img { width: 30px; height: 30px; }
.footer-desc { font-size: 0.9rem; color: #94a3b8; }
.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    margin-top: 36px; padding-top: 22px; text-align: center;
    font-size: 0.85rem; color: #64748b;
}

/* ===== 404 ===== */
.error { text-align: center; padding: 100px 20px; }
.error h1 { font-size: 5rem; color: var(--primary-dark); }
.error p { font-size: 1.2rem; color: var(--muted); margin: 16px 0 28px; }

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    .nav-links {
        display: none; position: absolute; top: 68px; left: 0; right: 0;
        background: #fff; flex-direction: column; padding: 20px; gap: 18px;
        border-bottom: 1px solid var(--border); box-shadow: var(--shadow);
    }
    .nav-links.open { display: flex; }
    .nav-toggle { display: block; }
    .hero-inner { flex-direction: column; }
    .scenes-grid, .features-grid, .pricing-grid, .dl-grid { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .nodes-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .hero-actions { flex-direction: column; }
}

@media (max-width: 480px) {
    .stats-grid, .nodes-grid, .footer-grid { grid-template-columns: 1fr; }
    .article h1 { font-size: 1.7rem; }
    .btn { padding: 12px 24px; font-size: 0.95rem; }
}