:root {
    --brand-gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --text: #1f2937;
    --muted: #667085;
    --light: #f6f8fc;
    --lighter: #f9fbff;
    --border: #e5e9f2;
    --card: #ffffff;
    --shadow: 0 18px 45px rgba(36, 56, 120, .10);
    --radius-lg: 32px;
    --radius-md: 24px;
    --radius-sm: 18px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--text);
    background: linear-gradient(180deg, #f7faff 0%, #ffffff 34%, #f6f8fc 100%);
    line-height: 1.72;
    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: 30;
    background: rgba(255,255,255,.92);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(229,233,242,.8);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; min-height: 72px; gap: 16px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: -.02em; }
.brand-logo { width: 42px; height: 42px; border-radius: 14px; object-fit: cover; box-shadow: 0 10px 20px rgba(41,128,254,.18); }
.site-nav { display: none; width: 100%; padding: 12px 0 18px; }
.site-nav a { display: block; padding: 10px 2px; color: #344054; font-size: 15px; }
.site-nav a.active, .site-nav a:hover { color: var(--blue); }
.nav-toggle { position: absolute; opacity: 0; pointer-events: none; }
.nav-toggle-label { display: grid; gap: 5px; cursor: pointer; padding: 10px; border: 1px solid var(--border); border-radius: 14px; background: #fff; }
.nav-toggle-label span { width: 22px; height: 2px; background: #25314c; display: block; border-radius: 999px; }
.nav-toggle:checked ~ .site-nav { display: block; position: absolute; left: 0; right: 0; top: 72px; background: rgba(255,255,255,.98); border-bottom: 1px solid var(--border); padding-left: 18px; padding-right: 18px; box-shadow: var(--shadow); }
.section { padding: 56px 0; }
.section-head { max-width: 760px; margin-bottom: 26px; }
.section-eyebrow, .badge { display: inline-flex; align-items: center; gap: 8px; 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: 1.22; margin: 0 0 14px; color: #152033; letter-spacing: -.03em; }
h1 { font-size: clamp(34px, 8vw, 64px); }
h2 { font-size: clamp(27px, 5vw, 42px); }
h3 { font-size: 21px; }
p { margin: 0 0 16px; color: var(--muted); }
ul, ol { color: var(--muted); padding-left: 20px; }
.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 15px 28px rgba(41,128,254,.28);
    transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}
.download-btn:hover { background: var(--blue-dark); transform: translateY(-2px); box-shadow: 0 18px 34px rgba(23,104,232,.32); }
.network-manager-hero { padding: 28px 0 36px; }
.hero-shell { border-radius: 32px; background: var(--brand-gradient); color: #fff; padding: 30px; position: relative; overflow: hidden; box-shadow: 0 28px 70px rgba(59,75,210,.22); }
.hero-shell::before, .hero-shell::after { content: ''; position: absolute; width: 280px; height: 280px; border-radius: 999px; background: rgba(255,255,255,.16); filter: blur(4px); }
.hero-shell::before { right: -80px; top: -80px; }
.hero-shell::after { left: -120px; bottom: -120px; }
.hero-content, .hero-visual { position: relative; z-index: 1; }
.hero-content p, .hero-content h1 { color: #fff; }
.hero-content p { opacity: .88; font-size: 17px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin: 18px 0 24px; }
.hero-tags span, .floating-label { background: rgba(255,255,255,.16); border: 1px solid rgba(255,255,255,.28); color: #fff; border-radius: 999px; padding: 8px 12px; font-size: 13px; backdrop-filter: blur(12px); }
.hero-visual { margin-top: 28px; }
.product-card { background: rgba(255,255,255,.16); border: 1px solid rgba(255,255,255,.28); border-radius: 32px; padding: 18px; backdrop-filter: blur(18px); position: relative; }
.product-card img { border-radius: 24px; margin: 0 auto; max-height: 390px; object-fit: contain; }
.floating-stack { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; margin-top: 14px; }
.daily-scenes { background: transparent; }
.scene-grid, .three-grid, .risk-grid, .faq-grid { display: grid; gap: 16px; }
.scene-card, .bento-card, .info-card, .risk-card, .faq-item, .step-card, .content-card, .panel, .tip-box, .check-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 22px;
    box-shadow: 0 12px 32px rgba(31,47,85,.06);
}
.scene-card small, .bento-card small { color: var(--blue); font-weight: 800; }
.more-link { color: var(--blue); font-weight: 800; display: inline-flex; margin-top: 6px; }
.bento-feature-center { background: var(--light); }
.bento-grid { display: grid; gap: 16px; }
.bento-card.featured { background: linear-gradient(180deg, #ffffff 0%, #f2f7ff 100%); }
.split-section, .smart-layout, .device-layout, .diagnosis-layout, .account-layout { display: grid; gap: 24px; align-items: center; }
.visual-panel { background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 18px; box-shadow: var(--shadow); }
.visual-panel img { border-radius: 24px; margin: auto; max-height: 420px; object-fit: contain; }
.safe-browsing-section, .privacy-guard-section, .network-diagnosis-section { background: #fff; }
.smart-route-section, .multi-device-section, .account-security-section { background: var(--lighter); }
.public-wifi-section { background: linear-gradient(180deg, #f7faff 0%, #fff 100%); }
.point-list { display: grid; gap: 10px; margin: 18px 0; }
.point-list span, .mini-tag { display: inline-flex; align-items: center; width: fit-content; padding: 7px 11px; border-radius: 999px; background: #edf5ff; color: #2367cf; font-weight: 700; font-size: 13px; }
.security-panel { border-radius: var(--radius-lg); background: #fff; border: 1px solid var(--border); padding: 22px; box-shadow: var(--shadow); }
.public-layout { display: grid; gap: 18px; }
.public-tags { display: flex; flex-wrap: wrap; gap: 10px; margin: 12px 0 18px; }
.privacy-cards, .process-steps { display: grid; gap: 16px; }
.process-steps { counter-reset: steps; }
.step-card { position: relative; padding-top: 52px; }
.step-card::before { counter-increment: steps; content: counter(steps, decimal-leading-zero); position: absolute; top: 18px; left: 20px; color: var(--blue); font-weight: 900; letter-spacing: .08em; }
.risk-card { border-left: 4px solid var(--blue); }
.cta-section { padding: 58px 0 72px; }
.cta-box { text-align: center; color: #fff; background: var(--brand-gradient); border-radius: var(--radius-lg); padding: 34px 20px; box-shadow: 0 24px 64px rgba(70,82,210,.20); }
.cta-box h2, .cta-box p { color: #fff; }
.page-hero { padding: 42px 0 28px; background: linear-gradient(180deg, #f7faff 0%, #fff 100%); }
.page-hero .container { display: grid; gap: 20px; }
.page-summary { font-size: 18px; max-width: 780px; }
.page-layout { display: grid; gap: 24px; padding: 20px 0 64px; }
.article-body { display: grid; gap: 18px; }
.sidebar { display: grid; gap: 16px; align-content: start; }
.tip-box { background: #f8fbff; }
.tip-box strong { display: block; margin-bottom: 8px; color: #152033; }
.check-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.check-list li { padding-left: 28px; position: relative; color: var(--muted); }
.check-list li::before { content: '✓'; position: absolute; left: 0; top: 0; color: var(--blue); font-weight: 900; }
.download-page .process-steps { margin-top: 20px; }
.site-footer { background: #101827; color: #d6deea; padding: 46px 0 24px; }
.site-footer p, .site-footer a, .footer-bottom { color: #aeb8c9; }
.footer-grid { display: grid; gap: 26px; }
.footer-grid h3 { color: #fff; font-size: 16px; margin-bottom: 10px; }
.footer-grid a { display: block; margin: 7px 0; }
.footer-brand { color: #fff; margin-bottom: 14px; }
.footer-bottom { margin-top: 30px; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.12); display: flex; flex-direction: column; gap: 8px; font-size: 13px; }
@media (min-width: 640px) {
    .scene-grid, .three-grid, .risk-grid, .privacy-cards, .process-steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .floating-stack { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}
@media (min-width: 860px) {
    .nav-toggle-label { display: none; }
    .site-nav { display: flex; align-items: center; justify-content: flex-end; gap: 18px; width: auto; padding: 0; }
    .site-nav a { padding: 8px 0; }
    .hero-shell { display: grid; grid-template-columns: 1.03fr .97fr; gap: 30px; padding: 52px; align-items: center; }
    .hero-visual { margin-top: 0; }
    .section { padding: 78px 0; }
    .scene-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .bento-grid { grid-template-columns: repeat(6, 1fr); grid-auto-rows: minmax(180px, auto); }
    .bento-card { grid-column: span 2; }
    .bento-card.featured { grid-column: span 3; grid-row: span 2; }
    .bento-card.wide { grid-column: span 4; }
    .split-section, .smart-layout, .device-layout, .diagnosis-layout, .account-layout { grid-template-columns: 1fr 1fr; }
    .public-layout { grid-template-columns: 1.08fr .92fr; align-items: center; }
    .privacy-cards { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .process-steps { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .risk-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .faq-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .page-layout { grid-template-columns: minmax(0, 1fr) 320px; }
    .footer-grid { grid-template-columns: 1.4fr repeat(3, .8fr); }
    .footer-bottom { flex-direction: row; justify-content: space-between; }
}
@media (min-width: 1100px) {
    .network-manager-hero { padding-top: 42px; }
    .hero-shell { border-radius: 42px; }
}
@media (max-width: 420px) {
    .container { width: min(100% - 24px, 1120px); }
    .hero-shell { padding: 24px 18px; border-radius: 26px; }
    .scene-card, .bento-card, .info-card, .risk-card, .faq-item, .step-card, .content-card, .panel, .tip-box { padding: 18px; }
    .download-btn { width: 100%; }
}