:root {
    --brand-gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --text: #1f2937;
    --muted: #667085;
    --soft: #f5f7fb;
    --line: #e5e7eb;
    --panel: #ffffff;
    --radius-lg: 34px;
    --radius-md: 24px;
    --shadow: 0 18px 45px rgba(38, 57, 120, .10);
}

* { 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: #f7f9fd;
    line-height: 1.75;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
p { margin: 0 0 14px; color: var(--muted); }
h1, h2, h3 { margin: 0 0 16px; line-height: 1.25; color: #111827; }
h1 { font-size: clamp(2rem, 8vw, 4.5rem); letter-spacing: -0.05em; }
h2 { font-size: clamp(1.55rem, 4.8vw, 2.8rem); letter-spacing: -0.035em; }
h3 { font-size: 1.16rem; }
ul, ol { margin: 0; padding-left: 20px; color: var(--muted); }
li { margin: 6px 0; }

.container { width: min(1160px, calc(100% - 32px)); margin: 0 auto; }
.section { padding: 62px 0; }
.section-head { margin-bottom: 28px; max-width: 780px; }
.eyebrow, .badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 14px;
    padding: 7px 12px;
    border-radius: 999px;
    background: rgba(41, 128, 254, .10);
    color: var(--blue);
    font-weight: 700;
    font-size: .86rem;
}
.badge.light { background: rgba(255,255,255,.16); color: #fff; }
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 24px;
    border-radius: 999px;
    background: var(--blue);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 14px 30px 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 36px rgba(23, 104, 232, .30); }
.text-link { color: var(--blue); font-weight: 800; }
.text-link:hover { color: var(--blue-dark); }

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,.88);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(229,231,235,.86);
}
.nav-wrap {
    width: min(1160px, calc(100% - 28px));
    margin: 0 auto;
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 900; color: #111827; white-space: nowrap; }
.brand img { width: 38px; height: 38px; border-radius: 12px; object-fit: cover; box-shadow: 0 8px 20px rgba(53, 88, 242, .15); }
.main-nav {
    position: absolute;
    left: 14px;
    right: 14px;
    top: 72px;
    display: none;
    padding: 14px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 20px;
    box-shadow: var(--shadow);
}
.main-nav a { display: block; padding: 10px 12px; color: #344054; font-weight: 700; border-radius: 12px; }
.main-nav a:hover { background: #f2f6ff; color: var(--blue); }
.nav-toggle { position: absolute; opacity: 0; pointer-events: none; }
.nav-toggle-label { width: 42px; height: 42px; display: inline-flex; flex-direction: column; justify-content: center; gap: 5px; border: 1px solid var(--line); border-radius: 14px; padding: 0 10px; background: #fff; }
.nav-toggle-label span { height: 2px; border-radius: 9px; background: #111827; }
.nav-toggle:checked ~ .main-nav { display: block; }

.network-manager-hero {
    width: min(1220px, calc(100% - 24px));
    margin: 22px auto 0;
    min-height: 690px;
    border-radius: 32px;
    background: var(--brand-gradient);
    color: #fff;
    overflow: hidden;
    position: relative;
}
.network-manager-hero::before, .network-manager-hero::after {
    content: "";
    position: absolute;
    width: 260px;
    height: 260px;
    border-radius: 50%;
    background: rgba(255,255,255,.18);
    filter: blur(8px);
}
.network-manager-hero::before { right: -80px; top: -60px; }
.network-manager-hero::after { left: -90px; bottom: -100px; }
.hero-inner { position: relative; z-index: 2; display: grid; gap: 36px; padding: 34px 22px 44px; }
.hero-copy h1, .hero-copy p { color: #fff; }
.hero-copy p { font-size: 1.04rem; max-width: 620px; opacity: .92; }
.hero-actions { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; margin-top: 24px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.hero-tags span, .visual-label, .status-pill {
    display: inline-flex;
    align-items: center;
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(255,255,255,.16);
    color: #fff;
    border: 1px solid rgba(255,255,255,.18);
    font-size: .88rem;
    font-weight: 700;
}
.hero-visual { position: relative; min-height: 360px; display: grid; place-items: center; }
.hero-device {
    width: min(420px, 88%);
    border-radius: 36px;
    padding: 18px;
    background: rgba(255,255,255,.14);
    border: 1px solid rgba(255,255,255,.22);
    box-shadow: 0 32px 70px rgba(0,0,0,.20);
}
.hero-device img { border-radius: 28px; margin: 0 auto; }
.visual-label { position: absolute; background: rgba(255,255,255,.92); color: #1f2937; box-shadow: 0 16px 40px rgba(0,0,0,.14); }
.visual-label.one { top: 24px; left: 0; }
.visual-label.two { right: 4px; top: 86px; }
.visual-label.three { left: 8px; bottom: 74px; }
.visual-label.four { right: 12px; bottom: 24px; }
.status-card {
    margin-top: 20px;
    padding: 18px;
    background: rgba(255,255,255,.92);
    color: #111827;
    border-radius: 26px;
    box-shadow: 0 18px 46px rgba(21,34,89,.18);
}
.status-card p { color: #475467; font-size: .94rem; }
.status-row { display: flex; justify-content: space-between; gap: 14px; align-items: center; margin-bottom: 8px; }
.status-dot { width: 10px; height: 10px; border-radius: 50%; background: #22c55e; box-shadow: 0 0 0 8px rgba(34,197,94,.12); }

.daily-scenes { background: #fff; }
.scene-grid { display: grid; gap: 16px; }
.scene-card, .bento-card, .info-card, .risk-card, .faq-item, .step-card, .content-card, .check-card {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    padding: 22px;
    box-shadow: 0 10px 30px rgba(20,35,80,.06);
}
.scene-card .tag, .bento-card .tag { display: inline-block; margin-bottom: 12px; color: var(--blue); font-weight: 900; font-size: .86rem; }

.bento-feature-center { background: linear-gradient(180deg, #f7f9ff 0%, #fff 100%); }
.bento-grid { display: grid; gap: 16px; }
.bento-card { min-height: 180px; display: flex; flex-direction: column; justify-content: space-between; }
.bento-card.featured { background: linear-gradient(145deg, #ffffff 0%, #eef4ff 100%); }

.split-section { padding: 70px 0; }
.split-panel {
    display: grid;
    gap: 26px;
    align-items: center;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow);
}
.split-panel.soft { background: linear-gradient(135deg, #f6f9ff 0%, #fff 100%); }
.feature-list { display: grid; gap: 12px; margin: 20px 0; }
.feature-list div { padding: 14px 16px; border-left: 4px solid var(--blue); background: #f8fbff; border-radius: 16px; color: #344054; }
.media-card { background: #f3f6fb; border-radius: 28px; padding: 18px; }
.media-card img { margin: 0 auto; border-radius: 24px; }

.public-wifi-section { background: #f6f8fc; }
.wifi-panel { background: #fff; border-radius: var(--radius-lg); border: 1px solid var(--line); padding: 24px; box-shadow: var(--shadow); }
.wifi-grid, .privacy-grid, .risk-grid, .page-grid, .cards-grid { display: grid; gap: 16px; }
.wifi-tags { display: flex; flex-wrap: wrap; gap: 10px; margin: 18px 0; }
.wifi-tags span { padding: 8px 12px; border-radius: 999px; background: #eef4ff; color: var(--blue); font-weight: 800; }

.privacy-guard-section { background: #fff; }
.privacy-panel { border-radius: var(--radius-lg); background: linear-gradient(135deg, #ffffff 0%, #f7f4ff 100%); border: 1px solid var(--line); padding: 24px; box-shadow: var(--shadow); }
.privacy-grid { margin-top: 20px; }
.info-card .num { width: 36px; height: 36px; display: grid; place-items: center; border-radius: 12px; background: #eef4ff; color: var(--blue); font-weight: 900; margin-bottom: 12px; }

.multi-device-section { background: linear-gradient(180deg, #fff 0%, #f6f8fc 100%); }
.device-stack { display: grid; gap: 14px; }
.device-pill { border-radius: 24px; border: 1px solid var(--line); padding: 16px; background: #fff; box-shadow: 0 10px 26px rgba(20,35,80,.05); }
.device-pill strong { display: block; margin-bottom: 4px; }

.network-diagnosis-section { background: #fff; }
.diagnosis-steps { display: grid; gap: 14px; margin-top: 20px; }
.diagnosis-step { display: grid; grid-template-columns: 42px 1fr; gap: 12px; padding: 16px; background: #f8fbff; border: 1px solid #dbeafe; border-radius: 18px; }
.diagnosis-step span { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 14px; background: var(--blue); color: #fff; font-weight: 900; }

.account-security-section { background: #f6f8fc; }
.check-list { display: grid; gap: 12px; margin-top: 18px; }
.check-card { display: flex; align-items: flex-start; gap: 12px; }
.check-card::before { content: "✓"; flex: 0 0 28px; width: 28px; height: 28px; border-radius: 50%; background: rgba(41,128,254,.12); color: var(--blue); display: grid; place-items: center; font-weight: 900; }

.process-steps { background: #fff; }
.step-grid { display: grid; gap: 16px; }
.step-card .step-num { width: 44px; height: 44px; display: grid; place-items: center; border-radius: 16px; background: var(--brand-gradient); color: #fff; font-weight: 900; margin-bottom: 16px; }

.safety-panel { background: #f6f8fc; }
.risk-card { border-left: 5px solid var(--blue); }
.risk-card strong { display: block; margin-bottom: 8px; color: #111827; }
.risk-card em { display: block; margin-top: 8px; font-style: normal; color: var(--blue); font-weight: 800; }

.faq-section { background: #fff; }
.faq-list { display: grid; gap: 14px; }
.faq-item h3 { margin-bottom: 8px; }

.cta-section { padding: 76px 0; }
.cta-box {
    position: relative;
    overflow: hidden;
    text-align: center;
    border-radius: var(--radius-lg);
    padding: 44px 24px;
    background: var(--brand-gradient);
    color: #fff;
    box-shadow: var(--shadow);
}
.cta-box h2, .cta-box p { color: #fff; }
.cta-box p { max-width: 640px; margin: 0 auto 22px; opacity: .9; }

.page-hero { padding: 52px 0 22px; }
.simple-hero-panel {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 28px;
    box-shadow: var(--shadow);
}
.simple-hero-panel.gradient { background: var(--brand-gradient); color: #fff; }
.simple-hero-panel.gradient h1, .simple-hero-panel.gradient p { color: #fff; }
.page-grid { align-items: start; }
.article-body { display: grid; gap: 18px; }
.article-body .content-card p:last-child { margin-bottom: 0; }
.side-panel { position: static; display: grid; gap: 16px; }
.note-box { border-radius: 22px; padding: 18px; background: #eef4ff; border: 1px solid #dbeafe; color: #344054; }
.notice-list { list-style: none; padding: 0; display: grid; gap: 10px; }
.notice-list li { padding: 12px 14px; background: #f8fbff; border: 1px solid #e0ecff; border-radius: 14px; }
.page-download { margin-top: 20px; }

.site-footer { background: #111827; color: #d1d5db; padding-top: 48px; }
.site-footer p, .site-footer a { color: #cbd5e1; }
.site-footer a { display: block; margin: 8px 0; }
.site-footer a:hover { color: #fff; }
.footer-grid { display: grid; gap: 28px; }
.footer-brand { color: #fff; font-size: 1.35rem; font-weight: 900; margin-bottom: 10px; }
.site-footer h3 { color: #fff; font-size: 1rem; }
.footer-bottom { margin-top: 34px; padding: 18px 16px; text-align: center; border-top: 1px solid rgba(255,255,255,.12); color: #9ca3af; font-size: .9rem; }

@media (min-width: 640px) {
    .scene-grid, .wifi-grid, .privacy-grid, .risk-grid, .cards-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .step-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .simple-hero-panel { padding: 38px; }
}

@media (min-width: 860px) {
    .main-nav { position: static; display: flex; align-items: center; gap: 4px; padding: 0; border: 0; box-shadow: none; background: transparent; }
    .main-nav a { padding: 8px 10px; font-size: .94rem; }
    .nav-toggle-label { display: none; }
    .network-manager-hero { border-radius: 42px; min-height: 640px; }
    .hero-inner { grid-template-columns: 1.05fr .95fr; align-items: center; padding: 62px 56px; }
    .hero-visual { min-height: 520px; }
    .scene-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .bento-grid { grid-template-columns: repeat(4, minmax(0, 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-panel { grid-template-columns: 1fr 1fr; padding: 38px; }
    .split-panel.reverse .media-card { order: -1; }
    .wifi-panel { padding: 40px; }
    .wifi-layout { display: grid; grid-template-columns: 1.1fr .9fr; gap: 28px; align-items: center; }
    .privacy-panel { padding: 40px; }
    .privacy-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .step-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .risk-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .page-grid { grid-template-columns: minmax(0, 1fr) 320px; gap: 26px; }
    .side-panel { position: sticky; top: 96px; }
    .footer-grid { grid-template-columns: 1.4fr .7fr .7fr; }
}

@media (min-width: 1080px) {
    .main-nav a { padding: 8px 12px; }
    .section { padding: 84px 0; }
    .split-section { padding: 90px 0; }
    .network-manager-hero { width: min(1240px, calc(100% - 40px)); }
}

@media (max-width: 420px) {
    .download-btn { width: 100%; }
    .hero-actions { align-items: stretch; }
    .visual-label { position: static; margin: 8px 4px 0; }
    .hero-visual { display: flex; flex-direction: column; }
}