:root {
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --text: #202635;
    --muted: #657086;
    --light: #F5F7FB;
    --line: #E6EAF2;
    --card: #FFFFFF;
    --soft-blue: #EEF5FF;
    --radius: 28px;
    --shadow: 0 18px 50px rgba(43, 72, 130, .12);
}
* { 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: #fff;
    line-height: 1.75;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
.container { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.section { padding: 54px 0; }
.section-soft { background: var(--light); }
.section-head { margin-bottom: 24px; }
.section-kicker, .badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--blue);
    background: var(--soft-blue);
    border: 1px solid #D7E7FF;
    border-radius: 999px;
    padding: 6px 12px;
    font-size: 14px;
    font-weight: 700;
}
h1, h2, h3 { line-height: 1.25; margin: 0 0 14px; }
h1 { font-size: clamp(34px, 8vw, 64px); letter-spacing: -1.6px; }
h2 { font-size: clamp(26px, 5vw, 40px); letter-spacing: -0.8px; }
h3 { font-size: 20px; }
p { margin: 0 0 14px; color: var(--muted); }
.small { font-size: 14px; }
.link { color: var(--blue); font-weight: 700; }
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 12px 24px;
    border-radius: 999px;
    background: var(--blue);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 12px 24px rgba(41,128,254,.22);
    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 30px rgba(23,104,232,.28); }
.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255,255,255,.92);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--line);
}
.header-inner {
    width: min(1180px, calc(100% - 28px));
    margin: 0 auto;
    min-height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}
.logo { display: flex; align-items: center; gap: 10px; font-weight: 900; font-size: 22px; color: #1F2B50; }
.logo img { width: 40px; height: 40px; border-radius: 12px; object-fit: cover; }
.site-nav { display: none; align-items: center; gap: 4px; }
.site-nav a { padding: 9px 12px; border-radius: 999px; color: #4F5A6F; font-size: 14px; font-weight: 700; }
.site-nav a:hover, .site-nav a.active { color: var(--blue); background: var(--soft-blue); }
.nav-check { display: none; }
.nav-toggle { width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 14px; display: grid; place-content: center; gap: 5px; cursor: pointer; }
.nav-toggle span { display: block; width: 20px; height: 2px; background: #2E3443; border-radius: 6px; }
.nav-check:checked ~ .site-nav {
    display: grid;
    position: absolute;
    left: 14px;
    right: 14px;
    top: 76px;
    padding: 14px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 22px;
    box-shadow: var(--shadow);
    grid-template-columns: 1fr 1fr;
}
.connection-workspace-hero {
    background: var(--gradient);
    color: #fff;
    padding: 54px 0 42px;
    position: relative;
    overflow: hidden;
}
.connection-workspace-hero::before,
.connection-workspace-hero::after {
    content: "";
    position: absolute;
    width: 320px;
    height: 320px;
    border-radius: 50%;
    background: rgba(255,255,255,.16);
    filter: blur(8px);
}
.connection-workspace-hero::before { left: -120px; top: -150px; }
.connection-workspace-hero::after { right: -120px; bottom: -160px; }
.hero-grid { position: relative; z-index: 1; display: grid; gap: 28px; align-items: center; }
.hero-copy p { color: rgba(255,255,255,.88); font-size: 17px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin: 18px 0 24px; }
.hero-tags span { padding: 8px 12px; border-radius: 999px; background: rgba(255,255,255,.16); border: 1px solid rgba(255,255,255,.26); color: #fff; font-weight: 700; font-size: 14px; }
.hero-visual { position: relative; min-height: 300px; }
.hero-device {
    background: rgba(255,255,255,.16);
    border: 1px solid rgba(255,255,255,.24);
    border-radius: 34px;
    padding: 20px;
    box-shadow: 0 24px 60px rgba(18, 25, 68, .22);
}
.hero-device img { margin: 0 auto; max-height: 360px; object-fit: contain; }
.status-panel {
    background: rgba(255,255,255,.95);
    color: var(--text);
    border-radius: 24px;
    padding: 18px;
    box-shadow: var(--shadow);
    border: 1px solid rgba(255,255,255,.74);
}
.hero-status { margin-top: 16px; }
.status-row { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 9px 0; border-bottom: 1px solid var(--line); color: var(--muted); }
.status-row:last-child { border-bottom: 0; }
.status-dot { display: inline-flex; align-items: center; gap: 8px; color: #1F9D62; font-weight: 800; }
.status-dot::before { content: ""; width: 9px; height: 9px; background: #27C37A; border-radius: 50%; box-shadow: 0 0 0 6px rgba(39,195,122,.14); }
.quick-task-entries { margin-top: -22px; position: relative; z-index: 3; }
.quick-task-grid { display: grid; gap: 14px; }
.task-card, .capability-card, .info-card, .risk-card, .faq-item, .step-card, .page-card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 24px;
    padding: 22px;
    box-shadow: 0 10px 30px rgba(54,72,106,.07);
}
.task-card .tag, .capability-card .tag { color: var(--blue); font-weight: 800; font-size: 13px; }
.task-card:hover, .capability-card:hover, .page-card:hover { transform: translateY(-2px); transition: transform .2s ease; }
.connection-capability-overview { padding-top: 48px; }
.capability-grid { display: grid; gap: 16px; }
.capability-card.feature { background: linear-gradient(180deg, #fff, #F7FAFF); }
.feature-layout { display: grid; gap: 18px; align-items: center; }
.feature-panel { background: #fff; border: 1px solid var(--line); border-radius: 30px; padding: 24px; box-shadow: var(--shadow); }
.feature-list { display: grid; gap: 10px; padding: 0; margin: 16px 0; list-style: none; }
.feature-list li { display: flex; gap: 10px; color: var(--muted); }
.feature-list li::before { content: ""; width: 8px; height: 8px; flex: 0 0 8px; margin-top: 11px; border-radius: 50%; background: var(--blue); }
.image-card { background: var(--light); border-radius: 28px; padding: 18px; border: 1px solid var(--line); }
.image-card img { margin: 0 auto; max-height: 330px; object-fit: contain; }
.encrypted-tunnel-section .security-panel { display: grid; gap: 16px; }
.security-tags { display: flex; flex-wrap: wrap; gap: 10px; margin: 12px 0 18px; }
.security-tags span { padding: 8px 12px; border-radius: 999px; color: var(--blue); background: var(--soft-blue); font-weight: 800; font-size: 14px; }
.route-board { display: grid; gap: 18px; }
.line-list { display: grid; gap: 12px; margin-top: 18px; }
.line-item { padding: 14px; border: 1px solid var(--line); border-radius: 18px; background: #fff; }
.line-top { display: flex; justify-content: space-between; font-weight: 800; }
.line-bar { height: 8px; background: #E8EEF8; border-radius: 999px; margin-top: 10px; overflow: hidden; }
.line-bar span { display: block; height: 100%; background: var(--gradient); border-radius: inherit; }
.device-grid, .data-grid, .scenario-grid, .risk-grid, .faq-grid { display: grid; gap: 16px; }
.data-boundary-section .info-card { border-top: 4px solid var(--blue); }
.process-steps { display: grid; gap: 14px; counter-reset: step; }
.step-card { position: relative; padding-left: 72px; }
.step-card::before {
    counter-increment: step;
    content: counter(step, decimal-leading-zero);
    position: absolute;
    left: 20px;
    top: 22px;
    width: 38px;
    height: 38px;
    border-radius: 14px;
    background: var(--blue);
    color: #fff;
    display: grid;
    place-items: center;
    font-weight: 900;
}
.risk-card { border-left: 4px solid var(--blue); }
.cta-section { padding: 56px 0; }
.cta-box {
    background: var(--gradient);
    color: #fff;
    border-radius: 34px;
    padding: 34px;
    text-align: center;
    overflow: hidden;
    position: relative;
}
.cta-box p { color: rgba(255,255,255,.88); max-width: 680px; margin-left: auto; margin-right: auto; }
.page-hero { padding: 52px 0 28px; background: linear-gradient(180deg, #F8FBFF 0%, #FFFFFF 100%); }
.page-hero .container { display: grid; gap: 16px; }
.page-hero p { max-width: 760px; font-size: 17px; }
.content-layout { display: grid; gap: 20px; align-items: start; }
.article-panel { background: #fff; border: 1px solid var(--line); border-radius: 30px; padding: 26px; box-shadow: var(--shadow); }
.article-panel h2 { font-size: 26px; }
.article-panel ul, .article-panel ol { color: var(--muted); padding-left: 20px; }
.side-panel { background: #F7FAFF; border: 1px solid var(--line); border-radius: 28px; padding: 22px; }
.side-panel a { display: block; color: var(--blue); font-weight: 800; padding: 8px 0; }
.download-panel { margin-top: 22px; padding: 22px; border: 1px solid var(--line); border-radius: 26px; background: var(--light); }
.download-page .article-panel { text-align: center; }
.download-steps { display: grid; gap: 14px; text-align: left; margin: 24px 0; }
.download-steps .step-card { background: #fff; }
.faq-list { display: grid; gap: 14px; }
.faq-item h3 { margin-bottom: 8px; }
.site-footer { background: #111827; color: #D9E0EC; padding: 46px 0 0; }
.site-footer p { color: #AEB8C8; }
.footer-grid { display: grid; gap: 26px; }
.footer-brand { font-size: 24px; font-weight: 900; margin-bottom: 10px; }
.site-footer h3 { font-size: 16px; color: #fff; }
.site-footer a { display: block; color: #AEB8C8; padding: 4px 0; }
.site-footer a:hover { color: #fff; }
.footer-bottom { margin-top: 30px; border-top: 1px solid rgba(255,255,255,.1); text-align: center; padding: 18px; color: #8D98A9; font-size: 14px; }
@media (min-width: 680px) {
    .quick-task-grid, .device-grid, .data-grid, .scenario-grid, .faq-grid { grid-template-columns: repeat(2, 1fr); }
    .risk-grid { grid-template-columns: repeat(2, 1fr); }
    .capability-grid { grid-template-columns: repeat(2, 1fr); }
    .process-steps { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 960px) {
    .section { padding: 76px 0; }
    .site-nav { display: flex; }
    .nav-toggle { display: none; }
    .hero-grid { grid-template-columns: minmax(0, 1.02fr) minmax(360px, .98fr); gap: 52px; }
    .hero-status { position: absolute; right: 0; bottom: 8px; width: 300px; margin: 0; }
    .quick-task-grid { grid-template-columns: repeat(4, 1fr); }
    .capability-grid { grid-template-columns: repeat(4, 1fr); grid-auto-flow: dense; }
    .capability-card.feature { grid-column: span 2; grid-row: span 2; }
    .feature-layout { grid-template-columns: 1fr 1fr; gap: 32px; }
    .encrypted-tunnel-section .security-panel { grid-template-columns: 1.2fr .8fr; align-items: center; }
    .security-card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
    .route-board { grid-template-columns: 1fr 1fr; align-items: center; }
    .device-grid, .data-grid, .scenario-grid { grid-template-columns: repeat(3, 1fr); }
    .risk-grid { grid-template-columns: repeat(4, 1fr); }
    .faq-grid { grid-template-columns: repeat(3, 1fr); }
    .content-layout { grid-template-columns: minmax(0, 1fr) 310px; }
    .footer-grid { grid-template-columns: 1.4fr 1fr 1fr 1fr; }
}
@media (max-width: 430px) {
    .container, .header-inner { width: min(100% - 24px, 1120px); }
    .download-btn { width: 100%; }
    .cta-box { padding: 28px 20px; }
    .task-card, .capability-card, .info-card, .risk-card, .faq-item, .page-card, .article-panel { padding: 20px; border-radius: 22px; }
    .step-card { padding-left: 64px; }
}