:root {
    --brand-gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --text: #202736;
    --muted: #667085;
    --light: #F5F7FB;
    --line: #E6EAF2;
    --card: #FFFFFF;
    --soft-blue: #EEF5FF;
    --radius-xl: 32px;
    --radius-lg: 24px;
    --radius-md: 18px;
    --shadow: 0 18px 50px rgba(39, 66, 126, .09);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
    color: var(--text);
    background: #fff;
    line-height: 1.75;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255,255,255,.92);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(230,234,242,.9);
}
.nav-wrap { display: flex; align-items: center; justify-content: space-between; min-height: 68px; gap: 16px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; font-size: 20px; }
.brand img { width: 38px; height: 38px; border-radius: 12px; object-fit: cover; }
.nav-check { position: absolute; opacity: 0; pointer-events: none; }
.nav-toggle { color: var(--blue); border: 1px solid #D6E6FF; background: #F7FAFF; padding: 8px 12px; border-radius: 999px; font-size: 14px; }
.main-nav {
    display: none;
    position: absolute;
    left: 16px;
    right: 16px;
    top: 68px;
    padding: 14px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 20px;
    box-shadow: var(--shadow);
}
.nav-check:checked ~ .main-nav { display: grid; gap: 8px; }
.main-nav a { color: #445064; padding: 10px 12px; border-radius: 12px; font-size: 14px; }
.main-nav a:hover, .main-nav a.active { background: #EEF5FF; color: var(--blue); }
.section { padding: 58px 0; }
.section-soft { background: var(--light); }
.section-head { margin-bottom: 24px; }
.section-kicker, .badge {
    display: inline-flex;
    align-items: center;
    color: var(--blue);
    background: #EDF5FF;
    border: 1px solid #D8E9FF;
    border-radius: 999px;
    padding: 6px 12px;
    font-size: 13px;
    font-weight: 700;
}
h1, h2, h3 { line-height: 1.25; margin: 0 0 12px; }
h1 { font-size: clamp(34px, 8vw, 58px); letter-spacing: -1.8px; }
h2 { font-size: clamp(26px, 5vw, 40px); letter-spacing: -1px; }
h3 { font-size: 20px; }
p { margin: 0 0 14px; color: var(--muted); }
.lead { font-size: 18px; color: #5D667A; }
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 24px;
    border-radius: 999px;
    background: var(--blue);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 14px 30px rgba(41,128,254,.25);
    transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}
.download-btn:hover { background: var(--blue-dark); transform: translateY(-1px); box-shadow: 0 16px 36px rgba(23,104,232,.28); }
.text-link { color: var(--blue); font-weight: 700; }
.text-link:hover { color: var(--blue-dark); }
.network-manager-hero { padding: 28px 0 48px; }
.hero-panel {
    background: var(--brand-gradient);
    color: #fff;
    border-radius: 34px;
    overflow: hidden;
    position: relative;
    padding: 30px;
    box-shadow: 0 28px 70px rgba(69, 74, 188, .24);
}
.hero-panel::before { content: ""; position: absolute; inset: -30% -20% auto auto; width: 340px; height: 340px; background: rgba(255,255,255,.18); border-radius: 50%; filter: blur(6px); }
.hero-grid { position: relative; display: grid; gap: 28px; align-items: center; }
.hero-panel p, .hero-panel .lead { color: rgba(255,255,255,.88); }
.hero-tags, .floating-tags, .tag-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.hero-tags span, .floating-tags span, .tag-row span {
    padding: 7px 12px;
    border-radius: 999px;
    background: rgba(255,255,255,.16);
    border: 1px solid rgba(255,255,255,.24);
    color: #fff;
    font-size: 13px;
}
.hero-visual { position: relative; display: grid; place-items: center; min-height: 300px; }
.hero-visual img { width: min(380px, 88%); border-radius: 30px; filter: drop-shadow(0 22px 38px rgba(20,31,77,.22)); }
.status-card {
    position: absolute;
    right: 12px;
    bottom: 10px;
    width: min(220px, 70%);
    background: rgba(255,255,255,.94);
    border-radius: 22px;
    color: var(--text);
    padding: 16px;
    box-shadow: var(--shadow);
}
.status-card strong { display: block; margin-bottom: 6px; }
.status-card p { font-size: 13px; margin: 0; color: var(--muted); }
.daily-scenes, .risk-grid, .faq-grid, .card-grid, .guide-grid, .tips-grid { display: grid; gap: 16px; }
.scene-card, .bento-card, .info-card, .risk-card, .faq-item, .step-card, .tip-card, .content-card, .side-card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 22px;
    box-shadow: 0 12px 34px rgba(28,45,92,.05);
}
.scene-label, .mini-label { color: var(--blue); font-weight: 800; font-size: 13px; display: block; margin-bottom: 10px; }
.bento-feature-center { display: grid; gap: 16px; }
.bento-card { min-height: 180px; display: flex; flex-direction: column; justify-content: space-between; }
.bento-card.large { background: linear-gradient(180deg, #fff 0%, #F4F8FF 100%); }
.feature-split, .smart-route-layout, .multi-device-layout, .diagnosis-layout, .account-layout, .about-layout, .download-layout, .detail-layout {
    display: grid;
    gap: 24px;
    align-items: center;
}
.feature-panel, .safety-panel, .privacy-panel, .cta-section, .page-hero, .download-box {
    border-radius: var(--radius-xl);
    padding: 28px;
    border: 1px solid var(--line);
    background: #fff;
    box-shadow: var(--shadow);
}
.feature-panel img, .image-card img, .download-box img { border-radius: 28px; margin: 0 auto; }
.point-list, .check-list, .clean-list { padding: 0; margin: 16px 0 0; list-style: none; display: grid; gap: 10px; }
.point-list li, .check-list li, .clean-list li { position: relative; padding-left: 28px; color: #465064; }
.point-list li::before, .check-list li::before, .clean-list li::before { content: ""; width: 10px; height: 10px; border-radius: 50%; background: var(--blue); position: absolute; left: 2px; top: 10px; }
.public-wifi-section .safety-panel { background: linear-gradient(180deg, #fff 0%, #F6FAFF 100%); }
.wifi-cards, .privacy-cards { display: grid; gap: 14px; margin-top: 18px; }
.multi-device-section .device-stack { display: grid; gap: 12px; }
.device-pill { padding: 14px 16px; background: #F7FAFF; border: 1px solid #DCEBFF; border-radius: 18px; color: #3D4B63; font-weight: 700; }
.process-steps { display: grid; gap: 14px; counter-reset: step; }
.step-card { position: relative; }
.step-number {
    display: inline-grid;
    place-items: center;
    width: 36px;
    height: 36px;
    border-radius: 12px;
    background: var(--blue);
    color: #fff;
    font-weight: 800;
    margin-bottom: 12px;
}
.risk-card { border-top: 4px solid var(--blue); }
.faq-item summary { cursor: pointer; color: var(--text); font-weight: 800; }
.faq-item p { margin-top: 10px; }
.cta-section {
    background: var(--brand-gradient);
    color: #fff;
    text-align: center;
    border: none;
}
.cta-section p { color: rgba(255,255,255,.86); max-width: 680px; margin-left: auto; margin-right: auto; }
.page-hero {
    margin-top: 26px;
    background: linear-gradient(135deg, #F7FAFF 0%, #FFFFFF 56%, #F8F2FF 100%);
}
.page-hero h1 { font-size: clamp(32px, 6vw, 48px); }
.reading { max-width: 820px; }
.side-card { align-self: start; background: #F7FAFF; }
.divider-card { background: #F8FAFC; border: 1px solid var(--line); border-radius: 24px; padding: 22px; }
.site-footer { background: #101828; color: #fff; padding: 46px 0 22px; margin-top: 50px; }
.site-footer p, .footer-bottom span { color: rgba(255,255,255,.7); }
.footer-grid { display: grid; gap: 24px; }
.footer-brand { font-size: 24px; font-weight: 900; margin-bottom: 10px; }
.site-footer h3 { font-size: 16px; color: #fff; }
.site-footer a { display: block; color: rgba(255,255,255,.72); margin: 8px 0; }
.site-footer a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.12); margin-top: 28px; padding-top: 18px; font-size: 13px; }
@media (min-width: 720px) {
    .daily-scenes { grid-template-columns: repeat(3, 1fr); }
    .risk-grid, .card-grid, .tips-grid { grid-template-columns: repeat(2, 1fr); }
    .faq-grid { grid-template-columns: repeat(2, 1fr); }
    .process-steps { grid-template-columns: repeat(2, 1fr); }
    .wifi-cards, .privacy-cards { grid-template-columns: repeat(3, 1fr); }
    .footer-grid { grid-template-columns: 2fr 1fr 1fr; }
}
@media (min-width: 960px) {
    .nav-toggle { display: none; }
    .main-nav { position: static; display: flex; align-items: center; gap: 2px; padding: 0; border: 0; box-shadow: none; background: transparent; }
    .hero-panel { padding: 54px; border-radius: 36px; }
    .hero-grid { grid-template-columns: 1.05fr .95fr; }
    .bento-feature-center { grid-template-columns: repeat(4, 1fr); grid-auto-rows: minmax(178px, auto); }
    .bento-card.large { grid-column: span 2; grid-row: span 2; }
    .bento-card.wide { grid-column: span 2; }
    .feature-split, .smart-route-layout, .multi-device-layout, .diagnosis-layout, .account-layout, .about-layout, .download-layout, .detail-layout { grid-template-columns: 1.05fr .95fr; }
    .risk-grid { grid-template-columns: repeat(4, 1fr); }
    .guide-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 430px) {
    .container { width: min(100% - 24px, 1120px); }
    .hero-panel, .feature-panel, .safety-panel, .privacy-panel, .cta-section, .page-hero, .download-box { padding: 22px; border-radius: 26px; }
    .download-btn { width: 100%; }
    .hero-tags span, .floating-tags span, .tag-row span { font-size: 12px; }
}