:root {
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --text: #202331;
    --muted: #657084;
    --soft: #F4F7FB;
    --line: #E4E9F2;
    --white: #FFFFFF;
    --shadow: 0 18px 45px rgba(40, 69, 130, .10);
    --radius: 26px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", "PingFang SC", 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; }
.container { width: min(1120px, calc(100% - 36px)); margin: 0 auto; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255,255,255,.92);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(226,231,241,.85);
}
.header-inner { min-height: 70px; display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: .2px; color: #18203B; }
.logo img { width: 38px; height: 38px; object-fit: contain; border-radius: 12px; }
.site-nav { display: none; position: absolute; left: 18px; right: 18px; top: 70px; padding: 12px; background: var(--white); border: 1px solid var(--line); border-radius: 22px; box-shadow: var(--shadow); }
.site-nav a { display: block; padding: 12px 14px; border-radius: 14px; color: #3B4357; font-weight: 650; }
.site-nav a:hover, .site-nav a.active { color: var(--blue); background: #EDF5FF; }
.nav-toggle { display: none; }
.nav-toggle-label { width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 14px; display: grid; place-content: center; gap: 5px; cursor: pointer; background: var(--white); }
.nav-toggle-label span { display: block; width: 20px; height: 2px; background: #26324D; border-radius: 2px; }
.nav-toggle:checked ~ .site-nav { display: block; }
.section { padding: 54px 0; }
.section-title { max-width: 740px; margin-bottom: 24px; }
.section-title .eyebrow, .badge { display: inline-flex; align-items: center; gap: 8px; padding: 6px 12px; border-radius: 999px; background: #EAF3FF; color: var(--blue); font-weight: 750; font-size: 13px; }
.section-title h2, .simple-hero h1 { margin: 14px 0 12px; font-size: clamp(28px, 5vw, 44px); line-height: 1.16; letter-spacing: -.6px; }
.section-title p, .simple-hero p { margin: 0; color: var(--muted); }
.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 !important;
    font-weight: 800;
    box-shadow: 0 12px 24px rgba(41,128,254,.24);
    transition: transform .18s ease, background .18s ease, box-shadow .18s ease;
}
.download-btn:hover { background: var(--blue-dark); transform: translateY(-2px); box-shadow: 0 16px 30px rgba(23,104,232,.28); }
.text-link { color: var(--blue); font-weight: 800; display: inline-flex; margin-top: 12px; }
.connection-workspace-hero {
    padding: 34px 0 52px;
    background: var(--gradient);
    color: #fff;
    border-bottom-left-radius: 34px;
    border-bottom-right-radius: 34px;
    position: relative;
    overflow: hidden;
}
.connection-workspace-hero::before, .connection-workspace-hero::after {
    content: "";
    position: absolute;
    border-radius: 50%;
    background: rgba(255,255,255,.18);
    filter: blur(2px);
}
.connection-workspace-hero::before { width: 220px; height: 220px; right: -80px; top: 30px; }
.connection-workspace-hero::after { width: 160px; height: 160px; left: -70px; bottom: -50px; }
.hero-grid { position: relative; z-index: 1; display: grid; gap: 30px; align-items: center; }
.hero-copy h1 { margin: 0 0 16px; font-size: clamp(34px, 8vw, 62px); line-height: 1.05; letter-spacing: -1.4px; }
.hero-copy p { color: rgba(255,255,255,.86); margin: 0 0 24px; font-size: 17px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.hero-tags span { padding: 8px 12px; border-radius: 999px; background: rgba(255,255,255,.16); border: 1px solid rgba(255,255,255,.24); font-size: 13px; }
.workspace-visual { position: relative; min-height: 340px; display: grid; place-items: center; }
.visual-card { width: min(440px, 100%); border-radius: 34px; background: rgba(255,255,255,.14); border: 1px solid rgba(255,255,255,.26); padding: 18px; box-shadow: 0 28px 70px rgba(20,24,60,.22); }
.visual-card img { margin: 0 auto; border-radius: 28px; max-height: 360px; object-fit: contain; }
.status-panel { background: #fff; color: var(--text); border: 1px solid rgba(228,233,242,.9); border-radius: 24px; box-shadow: var(--shadow); padding: 16px; }
.hero-status { position: static; margin-top: -10px; }
.status-row { display: flex; justify-content: space-between; gap: 12px; padding: 10px 0; border-bottom: 1px solid var(--line); }
.status-row:last-child { border-bottom: 0; }
.status-name { color: var(--muted); }
.status-value { font-weight: 850; color: #1B2C50; }
.status-dot { width: 10px; height: 10px; border-radius: 50%; background: #35C681; display: inline-block; margin-right: 7px; box-shadow: 0 0 0 6px rgba(53,198,129,.12); }
.quick-task-entries { margin-top: -28px; position: relative; z-index: 2; }
.quick-grid { display: grid; gap: 16px; }
.task-card, .capability-card, .feature-panel, .info-card, .faq-item, .risk-card, .step-card, .scenario-card, .guide-card, .notice-panel {
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: 0 12px 34px rgba(34,55,102,.06);
}
.task-card { padding: 22px; }
.task-label { color: var(--blue); font-size: 13px; font-weight: 850; }
.task-card h3, .capability-card h3, .info-card h3, .risk-card h3, .step-card h3, .scenario-card h3, .guide-card h3 { margin: 8px 0 8px; line-height: 1.3; }
.task-card p, .capability-card p, .info-card p, .risk-card p, .step-card p, .scenario-card p, .guide-card p { margin: 0; color: var(--muted); }
.connection-capability-overview { background: #F7F9FD; }
.capability-layout { display: grid; gap: 16px; }
.capability-card { padding: 24px; min-height: 190px; position: relative; overflow: hidden; }
.capability-card::after { content: ""; position: absolute; width: 90px; height: 90px; right: -32px; top: -32px; border-radius: 50%; background: #EAF3FF; }
.capability-card.featured { background: linear-gradient(135deg,#fff 0%,#F1F6FF 100%); }
.feature-panel { padding: 24px; overflow: hidden; }
.split { display: grid; gap: 24px; align-items: center; }
.split.reverse .image-wrap { order: -1; }
.feature-panel h2 { margin: 0 0 12px; font-size: clamp(26px, 5vw, 40px); line-height: 1.18; }
.feature-panel p { color: var(--muted); }
.check-list { list-style: none; padding: 0; margin: 18px 0 0; display: grid; gap: 10px; }
.check-list li { position: relative; padding-left: 28px; color: #3C455A; }
.check-list li::before { content: ""; position: absolute; left: 0; top: .65em; width: 10px; height: 10px; border-radius: 50%; background: var(--blue); box-shadow: 0 0 0 5px #EAF3FF; }
.image-wrap { background: #F1F5FB; border: 1px solid var(--line); border-radius: 28px; padding: 18px; }
.image-wrap img { margin: 0 auto; max-height: 340px; object-fit: contain; }
.encrypted-tunnel-section .feature-panel { background: #fff; }
.security-grid, .data-grid, .risk-grid, .scenario-grid, .guide-grid, .faq-list { display: grid; gap: 16px; }
.info-card { padding: 20px; }
.route-optimization-section, .usage-scenarios-section { background: #EEF5FF; }
.route-board { display: grid; gap: 18px; }
.line-status { display: grid; gap: 12px; }
.line-item { padding: 14px; border-radius: 18px; background: #fff; border: 1px solid var(--line); display: flex; justify-content: space-between; gap: 14px; align-items: center; }
.line-bar { width: 92px; height: 8px; background: #DFE9F8; border-radius: 999px; overflow: hidden; }
.line-bar span { display: block; height: 100%; background: var(--blue); border-radius: inherit; }
.device-cards { display: grid; gap: 14px; }
.device-mini { padding: 18px; border-radius: 22px; background: #fff; border: 1px solid var(--line); }
.device-mini strong { display: block; margin-bottom: 6px; }
.process-steps { display: grid; gap: 16px; counter-reset: step; }
.step-card { padding: 20px; position: relative; }
.step-no { width: 38px; height: 38px; border-radius: 14px; display: inline-grid; place-items: center; background: var(--gradient); color: #fff; font-weight: 900; }
.risk-card { padding: 20px; border-left: 4px solid var(--blue); }
.risk-card .suggest { margin-top: 10px; padding: 10px 12px; background: #F3F7FD; border-radius: 14px; color: #34415B; }
.faq-item { padding: 20px; }
.faq-item h3 { margin: 0 0 8px; font-size: 18px; }
.faq-item p { color: var(--muted); margin: 0; }
.cta-section { padding: 58px 0; }
.cta-box { background: var(--gradient); color: #fff; border-radius: 34px; padding: 34px 22px; text-align: center; overflow: hidden; position: relative; }
.cta-box::after { content: ""; position: absolute; width: 220px; height: 220px; right: -80px; bottom: -120px; border-radius: 50%; background: rgba(255,255,255,.16); }
.cta-box h2 { margin: 0 0 12px; font-size: clamp(28px, 6vw, 44px); line-height: 1.15; }
.cta-box p { margin: 0 auto 22px; max-width: 720px; color: rgba(255,255,255,.86); }
.simple-hero { padding: 48px 0 22px; }
.simple-hero-card { background: #fff; border: 1px solid var(--line); border-radius: 34px; padding: 28px; box-shadow: var(--shadow); position: relative; overflow: hidden; }
.simple-hero-card::before { content: ""; position: absolute; inset: 0 0 auto; height: 8px; background: var(--gradient); }
.page-layout { display: grid; gap: 22px; padding: 22px 0 56px; }
.article-card { background: #fff; border: 1px solid var(--line); border-radius: 30px; padding: 24px; box-shadow: 0 12px 34px rgba(34,55,102,.06); }
.article-card h2 { margin-top: 0; }
.article-card p { color: var(--muted); }
.side-panel { display: grid; gap: 16px; align-content: start; }
.notice-panel { padding: 20px; }
.notice-panel h3 { margin-top: 0; }
.notice-panel ul, .article-card ol { padding-left: 20px; color: #3E4659; }
.download-page .download-focus { text-align: center; padding: 34px 24px; }
.download-page .download-focus .download-btn { margin-top: 12px; }
.site-footer { background: #10182C; color: #D7DEEB; padding: 46px 0 22px; }
.footer-grid { display: grid; gap: 24px; }
.footer-brand { color: #fff; font-weight: 900; font-size: 22px; margin-bottom: 8px; }
.site-footer h3 { color: #fff; margin: 0 0 10px; }
.site-footer p { color: #AEB9CC; margin: 0; }
.site-footer a { display: block; color: #BFC9DA; margin: 7px 0; }
.site-footer a:hover { color: #fff; }
.footer-bottom { margin-top: 28px; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.12); color: #93A0B8; font-size: 14px; }
@media (min-width: 680px) {
    .quick-grid, .security-grid, .data-grid, .scenario-grid, .guide-grid, .risk-grid, .faq-list { grid-template-columns: repeat(2, 1fr); }
    .capability-layout { grid-template-columns: repeat(2, 1fr); }
    .process-steps { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
    .simple-hero-card, .article-card, .feature-panel { padding: 32px; }
}
@media (min-width: 960px) {
    .site-nav { display: flex; position: static; padding: 0; border: 0; border-radius: 0; box-shadow: none; background: transparent; gap: 4px; align-items: center; }
    .site-nav a { padding: 9px 11px; font-size: 14px; }
    .nav-toggle-label { display: none; }
    .connection-workspace-hero { padding: 64px 0 86px; border-bottom-left-radius: 54px; border-bottom-right-radius: 54px; }
    .hero-grid { grid-template-columns: 1.02fr .98fr; gap: 48px; }
    .hero-copy p { font-size: 18px; max-width: 620px; }
    .hero-status { position: absolute; right: 4px; bottom: 12px; width: 270px; margin: 0; }
    .visual-card { transform: translateX(-30px); }
    .quick-grid { grid-template-columns: repeat(4, 1fr); }
    .capability-layout { grid-template-columns: repeat(4, 1fr); grid-auto-flow: dense; }
    .capability-card.featured { grid-column: span 2; min-height: 230px; }
    .split { grid-template-columns: 1fr 1fr; }
    .split.reverse .image-wrap { order: 0; }
    .route-board { grid-template-columns: 1.1fr .9fr; align-items: center; }
    .security-grid, .data-grid, .scenario-grid { grid-template-columns: repeat(3, 1fr); }
    .risk-grid { grid-template-columns: repeat(2, 1fr); }
    .process-steps { grid-template-columns: repeat(3, 1fr); }
    .page-layout { grid-template-columns: minmax(0, 1fr) 320px; align-items: start; }
    .footer-grid { grid-template-columns: 1.4fr .8fr .8fr 1fr; }
    .section { padding: 76px 0; }
}
@media (min-width: 1160px) {
    .site-nav a { padding: 10px 14px; font-size: 15px; }
}
@media (max-width: 420px) {
    .container { width: min(100% - 26px, 1120px); }
    .download-btn { width: 100%; }
    .hero-copy .download-btn, .cta-box .download-btn { width: auto; min-width: 172px; }
    .site-nav { left: 13px; right: 13px; }
}