* { box-sizing: border-box; }
:root {
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --text: #222938;
    --muted: #667085;
    --light: #F5F7FB;
    --line: #E5EAF3;
    --card: #FFFFFF;
    --soft-blue: #EEF5FF;
    --radius-lg: 32px;
    --radius-md: 24px;
    --shadow: 0 18px 50px rgba(37, 54, 99, 0.10);
}
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
    color: var(--text);
    background: #FFFFFF;
    line-height: 1.7;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(229,234,243,0.9);
}
.nav-wrap {
    width: min(1160px, calc(100% - 32px));
    margin: 0 auto;
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; color: #1D2740; }
.brand-logo, .footer-logo { width: 38px; height: 38px; border-radius: 12px; object-fit: cover; box-shadow: 0 8px 20px rgba(41,128,254,.18); }
.site-nav { display: none; position: absolute; top: 68px; left: 16px; right: 16px; background: #fff; border: 1px solid var(--line); border-radius: 22px; padding: 12px; box-shadow: var(--shadow); }
.site-nav a { display: block; padding: 12px 14px; border-radius: 14px; color: #4A5568; font-weight: 600; }
.site-nav a.active, .site-nav a:hover { background: var(--soft-blue); color: var(--blue); }
.nav-toggle-checkbox { position: absolute; opacity: 0; pointer-events: none; }
.nav-toggle { width: 44px; height: 44px; border: 1px solid var(--line); border-radius: 14px; display: grid; place-items: center; gap: 4px; padding: 10px; }
.nav-toggle span { width: 19px; height: 2px; background: #26324A; display: block; border-radius: 10px; }
.nav-toggle-checkbox:checked ~ .site-nav { display: block; }
.container, .section-inner { width: min(1160px, calc(100% - 32px)); margin: 0 auto; }
.section { padding: 64px 0; }
.section.soft { background: var(--light); }
.section-title { max-width: 760px; margin-bottom: 28px; }
.section-title.center { margin-left: auto; margin-right: auto; text-align: center; }
.kicker, .badge { display: inline-flex; align-items: center; gap: 8px; color: var(--blue); background: #EAF3FF; border: 1px solid #D7E7FF; padding: 7px 12px; border-radius: 999px; font-size: 14px; font-weight: 700; }
h1, h2, h3 { line-height: 1.25; margin: 0 0 14px; color: #172033; }
h1 { font-size: clamp(34px, 7vw, 64px); letter-spacing: -0.04em; }
h2 { font-size: clamp(26px, 4vw, 42px); letter-spacing: -0.03em; }
h3 { font-size: 20px; }
p { margin: 0 0 16px; color: var(--muted); }
.download-btn { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 13px 24px; border-radius: 999px; background: #2980FE; color: #fff; font-weight: 800; box-shadow: 0 14px 28px rgba(41,128,254,.24); transition: transform .2s ease, background .2s ease, box-shadow .2s ease; }
.download-btn:hover { background: #1768E8; transform: translateY(-2px); box-shadow: 0 18px 32px rgba(23,104,232,.26); }
.network-manager-hero { padding: 28px 0 72px; background: radial-gradient(circle at top left, rgba(41,128,254,.12), transparent 34%), #fff; }
.hero-card { width: min(1160px, calc(100% - 32px)); margin: 0 auto; background: var(--gradient); border-radius: 36px; padding: 28px; color: #fff; overflow: hidden; position: relative; box-shadow: 0 30px 80px rgba(70, 74, 180, .22); }
.hero-card::before { content: ""; position: absolute; width: 360px; height: 360px; border-radius: 50%; right: -120px; top: -120px; background: rgba(255,255,255,.18); }
.hero-grid { position: relative; display: grid; gap: 30px; align-items: center; }
.hero-copy p, .hero-copy h1 { color: #fff; }
.hero-copy .hero-desc { font-size: 17px; max-width: 640px; color: rgba(255,255,255,.88); }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin: 22px 0 28px; }
.hero-tags span { background: rgba(255,255,255,.16); border: 1px solid rgba(255,255,255,.24); color: #fff; padding: 8px 12px; border-radius: 999px; font-size: 14px; }
.hero-visual { position: relative; min-height: 320px; display: grid; place-items: center; }
.hero-visual img { width: min(420px, 86%); border-radius: 30px; filter: drop-shadow(0 24px 40px rgba(20,30,90,.26)); }
.float-label { position: absolute; background: rgba(255,255,255,.94); color: #26324A; padding: 10px 14px; border-radius: 16px; font-weight: 800; box-shadow: 0 12px 28px rgba(31,40,70,.16); font-size: 14px; }
.float-label.one { top: 20px; left: 6px; }
.float-label.two { top: 78px; right: 0; }
.float-label.three { bottom: 66px; left: 18px; }
.float-label.four { bottom: 12px; right: 34px; }
.daily-scenes { display: grid; gap: 16px; }
.scene-card, .bento-card, .white-panel, .faq-item, .risk-card, .step-card, .mini-card, .info-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius-md); padding: 22px; box-shadow: 0 10px 30px rgba(32,48,84,.05); }
.scene-card small, .bento-card small { color: var(--blue); font-weight: 800; }
.card-link { color: var(--blue); font-weight: 800; display: inline-flex; margin-top: 4px; }
.bento-feature-center { display: grid; gap: 16px; }
.bento-card.featured { background: linear-gradient(180deg, #FFFFFF 0%, #F6F9FF 100%); }
.split-section { display: grid; gap: 24px; align-items: center; }
.safe-browsing-section, .smart-route-section, .public-wifi-section, .privacy-guard-section, .multi-device-section, .network-diagnosis-section, .account-security-section { border-radius: 34px; }
.image-panel { border-radius: 32px; padding: 18px; background: linear-gradient(145deg, #F1F6FF, #FFFFFF); border: 1px solid var(--line); box-shadow: var(--shadow); }
.image-panel img { border-radius: 24px; margin: 0 auto; }
.bullet-list { list-style: none; padding: 0; margin: 16px 0 0; display: grid; gap: 10px; }
.bullet-list li { color: #435066; background: #F8FAFE; border: 1px solid var(--line); border-radius: 16px; padding: 12px 14px; }
.smart-route-section { background: #F6F8FC; padding: 34px; }
.route-metrics { display: grid; gap: 12px; margin-top: 18px; }
.route-metrics div { padding: 16px; border-radius: 18px; background: #fff; border: 1px solid var(--line); }
.public-wifi-section .wifi-grid, .privacy-grid, .risk-grid, .process-steps, .faq-grid, .guide-grid, .check-grid { display: grid; gap: 16px; }
.wifi-panel { background: #fff; border-radius: 34px; border: 1px solid var(--line); padding: 28px; box-shadow: var(--shadow); }
.privacy-band { background: linear-gradient(90deg, #F7FAFF, #FFFFFF); border: 1px solid var(--line); border-radius: 32px; padding: 26px; }
.device-stack { display: grid; gap: 14px; }
.device-card { border-radius: 22px; border: 1px solid var(--line); background: #fff; padding: 18px; }
.diagnosis-flow { counter-reset: step; display: grid; gap: 14px; }
.diagnosis-flow .step-card { position: relative; padding-left: 64px; }
.diagnosis-flow .step-card::before { counter-increment: step; content: counter(step); position: absolute; left: 20px; top: 22px; width: 32px; height: 32px; border-radius: 50%; background: var(--blue); color: #fff; display: grid; place-items: center; font-weight: 800; }
.check-card { background: #fff; border: 1px solid var(--line); border-radius: 24px; padding: 20px; }
.process-steps { counter-reset: process; }
.process-steps .step-card { position: relative; }
.step-no { display: inline-grid; place-items: center; width: 34px; height: 34px; border-radius: 50%; background: var(--blue); color: #fff; font-weight: 800; margin-bottom: 10px; }
.risk-card { border-left: 4px solid var(--blue); }
.cta-section { padding: 70px 0; }
.cta-box { width: min(960px, calc(100% - 32px)); margin: 0 auto; text-align: center; border-radius: 36px; background: var(--gradient); color: #fff; padding: 42px 26px; box-shadow: 0 28px 70px rgba(70,74,180,.22); }
.cta-box h2, .cta-box p { color: #fff; }
.page-hero { background: linear-gradient(180deg, #F7FAFF 0%, #FFFFFF 100%); padding: 58px 0 34px; }
.page-hero-inner { width: min(920px, calc(100% - 32px)); margin: 0 auto; }
.page-hero .download-btn { margin-top: 12px; }
.content-layout { width: min(1120px, calc(100% - 32px)); margin: 0 auto; display: grid; gap: 22px; padding: 28px 0 70px; }
.article-panel { background: #fff; border: 1px solid var(--line); border-radius: 32px; padding: 26px; box-shadow: var(--shadow); }
.side-panel { background: #F8FAFE; border: 1px solid var(--line); border-radius: 28px; padding: 22px; align-self: start; }
.side-panel a { color: var(--blue); font-weight: 800; display: block; margin: 10px 0; }
.note-box { background: #F3F7FF; border: 1px solid #DDEAFF; border-radius: 22px; padding: 18px; margin-top: 18px; color: #475467; }
.faq-item summary { cursor: pointer; font-weight: 800; color: #172033; }
.faq-item p { margin-top: 12px; }
.site-footer { background: #111827; color: #D6DCE8; padding: 46px 0 22px; }
.footer-inner { width: min(1160px, calc(100% - 32px)); margin: 0 auto; display: grid; gap: 28px; }
.footer-brand { display: flex; gap: 14px; align-items: flex-start; }
.footer-brand strong, .footer-links h3 { color: #fff; }
.footer-links { display: grid; gap: 22px; }
.footer-links a { color: #C9D2E3; display: block; margin: 8px 0; }
.footer-bottom { width: min(1160px, calc(100% - 32px)); margin: 28px auto 0; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.12); color: #9CA8BB; font-size: 14px; }
@media (min-width: 680px) {
    .daily-scenes, .public-wifi-section .wifi-grid, .privacy-grid, .risk-grid, .guide-grid, .check-grid, .footer-links { grid-template-columns: repeat(2, 1fr); }
    .process-steps, .faq-grid { grid-template-columns: repeat(2, 1fr); }
    .route-metrics { grid-template-columns: repeat(3, 1fr); }
}
@media (min-width: 960px) {
    .site-nav { position: static; display: flex; align-items: center; gap: 4px; padding: 0; border: 0; box-shadow: none; background: transparent; }
    .site-nav a { padding: 9px 12px; font-size: 14px; }
    .nav-toggle { display: none; }
    .hero-card { padding: 54px; }
    .hero-grid { grid-template-columns: 1.05fr .95fr; }
    .daily-scenes { grid-template-columns: repeat(3, 1fr); }
    .bento-feature-center { grid-template-columns: repeat(4, 1fr); grid-auto-rows: minmax(180px, auto); }
    .bento-card.featured { grid-column: span 2; grid-row: span 2; }
    .bento-card.wide { grid-column: span 2; }
    .split-section { grid-template-columns: 1fr 1fr; }
    .public-wifi-section .wifi-grid, .privacy-grid, .risk-grid { grid-template-columns: repeat(3, 1fr); }
    .multi-device-section .split-section { grid-template-columns: .9fr 1.1fr; }
    .process-steps { grid-template-columns: repeat(3, 1fr); }
    .content-layout { grid-template-columns: minmax(0, 1fr) 320px; }
    .footer-inner { grid-template-columns: .95fr 1.45fr; }
    .footer-links { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 420px) {
    .container, .section-inner, .hero-card, .cta-box, .content-layout, .page-hero-inner, .footer-inner, .footer-bottom { width: calc(100% - 24px); }
    .hero-card, .cta-box { border-radius: 26px; padding: 24px; }
    .float-label { font-size: 12px; padding: 8px 10px; }
    .download-btn { width: 100%; }
    .section { padding: 46px 0; }
}