:root {
    --brand-gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --text: #1C2433;
    --muted: #647086;
    --soft: #F5F7FB;
    --soft-blue: #EEF5FF;
    --line: #E4E9F2;
    --white: #FFFFFF;
    --radius-lg: 34px;
    --radius-md: 24px;
    --shadow: 0 18px 50px rgba(31, 51, 92, 0.08);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
    color: var(--text);
    background: #FFFFFF;
    line-height: 1.72;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(228,233,242,0.8);
}
.header-inner,
.container,
.section-inner,
.footer-inner {
    width: min(1160px, calc(100% - 36px));
    margin: 0 auto;
}
.header-inner {
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}
.brand { display: flex; align-items: center; gap: 12px; font-weight: 800; color: #172038; }
.brand-logo { width: 42px; height: 42px; border-radius: 14px; object-fit: cover; }
.brand-text { font-size: 18px; white-space: nowrap; }
.nav-toggle {
    border: 1px solid var(--line);
    background: #fff;
    border-radius: 999px;
    padding: 9px 15px;
    color: var(--text);
    font-weight: 700;
}
.main-nav {
    display: none;
    position: absolute;
    top: 72px;
    left: 18px;
    right: 18px;
    padding: 14px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 22px;
    box-shadow: var(--shadow);
}
.main-nav.is-open { display: grid; gap: 8px; }
.main-nav a { padding: 10px 12px; border-radius: 14px; color: #40506A; font-weight: 650; }
.main-nav a:hover { background: var(--soft-blue); color: var(--blue); }
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 46px;
    padding: 13px 24px;
    border-radius: 999px;
    background: var(--blue);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 12px 28px rgba(41, 128, 254, 0.25);
    transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}
.download-btn:hover { background: var(--blue-dark); transform: translateY(-2px); box-shadow: 0 16px 34px rgba(23,104,232,.28); }
.network-manager-hero {
    padding: 28px 0 34px;
    background: linear-gradient(180deg, #F7FAFF 0%, #FFFFFF 100%);
}
.hero-shell {
    background: var(--brand-gradient);
    border-radius: 30px;
    padding: 30px;
    color: #fff;
    position: relative;
    overflow: hidden;
}
.hero-shell::after {
    content: "";
    position: absolute;
    width: 360px;
    height: 360px;
    border-radius: 50%;
    background: rgba(255,255,255,.18);
    right: -120px;
    top: -90px;
    filter: blur(8px);
}
.hero-grid { display: grid; gap: 28px; position: relative; z-index: 1; }
.hero-copy h1 { margin: 0 0 16px; font-size: clamp(32px, 8vw, 62px); line-height: 1.08; letter-spacing: -0.04em; }
.hero-copy p { margin: 0 0 22px; color: rgba(255,255,255,.9); font-size: 16px; max-width: 640px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.hero-tags span,
.floating-label {
    display: inline-flex;
    align-items: center;
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(255,255,255,.18);
    border: 1px solid rgba(255,255,255,.24);
    color: #fff;
    font-size: 13px;
    font-weight: 700;
}
.hero-visual { position: relative; min-height: 300px; }
.hero-visual img { width: min(470px, 100%); margin: 0 auto; border-radius: 28px; box-shadow: 0 20px 70px rgba(20,22,70,.18); }
.hero-float { position: absolute; display: flex; flex-wrap: wrap; gap: 10px; inset: auto 12px 16px 12px; justify-content: center; }
.floating-label { background: rgba(255,255,255,.88); color: #23314C; border-color: rgba(255,255,255,.7); box-shadow: 0 12px 28px rgba(28,36,51,.12); }
.section { padding: 56px 0; }
.section-soft { background: var(--soft); }
.section-head { margin-bottom: 26px; max-width: 760px; }
.eyebrow, .category-badge {
    display: inline-flex;
    color: var(--blue);
    font-weight: 850;
    background: #EAF3FF;
    border-radius: 999px;
    padding: 6px 12px;
    font-size: 13px;
    margin-bottom: 12px;
}
h2 { margin: 0 0 12px; font-size: clamp(26px, 5vw, 42px); line-height: 1.2; letter-spacing: -0.03em; }
h3 { margin: 0 0 8px; font-size: 21px; line-height: 1.35; }
p { color: var(--muted); }
.daily-scenes { display: grid; gap: 16px; }
.scene-card, .bento-card, .white-panel, .risk-card, .faq-item, .info-card, .step-card {
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    padding: 22px;
    box-shadow: 0 12px 32px rgba(31,51,92,.05);
}
.scene-card .tag, .bento-card .tag { color: var(--blue); font-weight: 850; font-size: 13px; }
.text-link { color: var(--blue); font-weight: 800; }
.text-link:hover { color: var(--blue-dark); }
.bento-feature-center { display: grid; gap: 16px; }
.bento-card.large { background: linear-gradient(180deg, #FFFFFF 0%, #F7FBFF 100%); }
.split-section, .safe-browsing-section, .smart-route-section, .multi-device-section {
    display: grid;
    gap: 24px;
    align-items: center;
}
.feature-image { border-radius: var(--radius-lg); background: #fff; box-shadow: var(--shadow); overflow: hidden; }
.feature-image img { width: 100%; height: auto; }
.feature-list { display: grid; gap: 10px; margin: 20px 0; padding: 0; list-style: none; }
.feature-list li { padding: 12px 14px; background: var(--soft-blue); border-radius: 16px; color: #33415C; }
.feature-list li strong { color: var(--text); }
.public-wifi-section .wifi-grid,
.privacy-grid,
.risk-grid,
.card-grid,
.check-grid { display: grid; gap: 16px; }
.safety-panel {
    background: linear-gradient(180deg, #FFFFFF 0%, #F6FAFF 100%);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow);
}
.panel-tags { display: flex; flex-wrap: wrap; gap: 10px; margin: 14px 0 0; }
.panel-tags span { color: var(--blue); background: #EAF3FF; border-radius: 999px; padding: 7px 11px; font-weight: 800; font-size: 13px; }
.process-steps { display: grid; gap: 16px; counter-reset: steps; }
.step-card { position: relative; padding-left: 76px; min-height: 118px; }
.step-number {
    position: absolute;
    left: 20px;
    top: 22px;
    width: 40px;
    height: 40px;
    border-radius: 14px;
    background: var(--blue);
    color: #fff;
    display: grid;
    place-items: center;
    font-weight: 900;
}
.risk-card { border-left: 4px solid var(--blue); }
.risk-card strong { color: var(--text); }
.faq-list { display: grid; gap: 14px; }
.faq-item h3 { font-size: 18px; }
.cta-section {
    padding: 58px 0;
    background: var(--brand-gradient);
    color: #fff;
    text-align: center;
}
.cta-section p { color: rgba(255,255,255,.86); max-width: 680px; margin: 0 auto 22px; }
.page-hero { padding: 44px 0 30px; background: linear-gradient(180deg,#F6FAFF 0%,#FFFFFF 100%); }
.page-hero-card {
    border-radius: var(--radius-lg);
    padding: 28px;
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}
.page-hero h1 { margin: 0 0 14px; font-size: clamp(32px, 7vw, 54px); line-height: 1.12; letter-spacing: -0.04em; }
.page-layout { display: grid; gap: 22px; align-items: start; }
.article-panel { background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 24px; }
.article-panel p { margin: 0 0 16px; }
.side-panel { display: grid; gap: 14px; }
.notice-box { padding: 18px; border-radius: 22px; background: var(--soft-blue); border: 1px solid #D9E9FF; }
.download-area { margin-top: 22px; }
.download-steps { list-style: none; padding: 0; margin: 20px 0; display: grid; gap: 12px; }
.download-steps li { background: var(--soft-blue); padding: 14px 16px; border-radius: 16px; color: #34435F; }
.download-steps span { font-weight: 900; color: var(--blue); margin-right: 8px; }
.site-footer { background: #101827; color: #DDE6F5; padding: 42px 0; }
.footer-inner { display: grid; gap: 22px; }
.footer-logo { width: 54px; height: 54px; border-radius: 18px; object-fit: cover; margin-bottom: 12px; }
.footer-brand p, .footer-note { color: #AEBAD0; margin: 0; }
.footer-links { display: flex; flex-wrap: wrap; gap: 12px; }
.footer-links a { color: #EAF1FF; background: rgba(255,255,255,.08); border-radius: 999px; padding: 8px 12px; }
@media (min-width: 700px) {
    .daily-scenes { grid-template-columns: repeat(3, 1fr); }
    .bento-feature-center { grid-template-columns: repeat(2, 1fr); }
    .privacy-grid, .card-grid, .check-grid { grid-template-columns: repeat(2, 1fr); }
    .risk-grid { grid-template-columns: repeat(2, 1fr); }
    .process-steps { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 960px) {
    .nav-toggle { display: none; }
    .main-nav {
        display: flex;
        position: static;
        box-shadow: none;
        padding: 0;
        border: 0;
        background: transparent;
        gap: 4px;
        align-items: center;
    }
    .main-nav a { font-size: 14px; }
    .hero-shell { border-radius: 42px; padding: 52px; }
    .hero-grid { grid-template-columns: 1.02fr .98fr; align-items: center; }
    .hero-copy p { font-size: 18px; }
    .section { padding: 82px 0; }
    .bento-feature-center { grid-template-columns: repeat(4, 1fr); grid-auto-rows: minmax(190px, auto); }
    .bento-card.large { grid-column: span 2; grid-row: span 2; }
    .bento-card.wide { grid-column: span 2; }
    .safe-browsing-section, .smart-route-section, .split-section, .multi-device-section { grid-template-columns: 1fr 1fr; }
    .public-wifi-section .wifi-grid { grid-template-columns: 1.1fr .9fr; align-items: center; }
    .privacy-grid { grid-template-columns: repeat(3, 1fr); }
    .risk-grid { grid-template-columns: repeat(4, 1fr); }
    .page-layout { grid-template-columns: minmax(0, 1fr) 330px; }
    .article-panel, .page-hero-card, .safety-panel { padding: 34px; }
    .footer-inner { grid-template-columns: 1fr auto; align-items: start; }
    .footer-note { grid-column: 1 / -1; }
}
@media (min-width: 1180px) {
    .process-steps { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 420px) {
    .header-inner, .container, .section-inner, .footer-inner { width: min(100% - 28px, 1160px); }
    .hero-shell, .page-hero-card, .article-panel, .safety-panel { border-radius: 24px; padding: 22px; }
    .download-btn { width: 100%; }
    .step-card { padding-left: 22px; padding-top: 72px; }
}