:root {
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --text: #273142;
    --muted: #687386;
    --soft: #F4F7FB;
    --line: #E4EAF3;
    --white: #FFFFFF;
    --radius-lg: 28px;
    --radius-md: 20px;
    --shadow: 0 18px 50px rgba(37, 56, 92, 0.10);
}
* { 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: #FAFBFE;
    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; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,0.94);
    border-bottom: 1px solid rgba(228,234,243,0.9);
    backdrop-filter: blur(14px);
}
.header-inner { min-height: 70px; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 800; color: #17243B; }
.logo img { width: 38px; height: 38px; border-radius: 12px; object-fit: cover; }
.nav-toggle { width: 44px; height: 44px; border: 1px solid var(--line); background: var(--white); border-radius: 14px; display: inline-flex; flex-direction: column; justify-content: center; gap: 5px; padding: 0 11px; }
.nav-toggle span { display: block; height: 2px; background: #273142; border-radius: 99px; }
.site-nav { display: none; position: absolute; left: 16px; right: 16px; top: 76px; padding: 14px; background: var(--white); border: 1px solid var(--line); border-radius: 22px; box-shadow: var(--shadow); }
.site-nav.open { display: grid; gap: 6px; }
.site-nav a { padding: 10px 12px; border-radius: 14px; color: var(--muted); font-size: 14px; }
.site-nav a.active, .site-nav a:hover { background: #EEF5FF; color: var(--blue); }
.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: 750;
    box-shadow: 0 12px 28px rgba(41,128,254,0.24);
    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(23,104,232,0.28); }
.text-link { color: var(--blue); font-weight: 700; }
.section { padding: 58px 0; }
.section.alt { background: var(--soft); }
.section-head { margin-bottom: 26px; max-width: 760px; }
.section-head.center { text-align: center; margin-left: auto; margin-right: auto; }
.eyebrow, .badge { display: inline-flex; align-items: center; gap: 8px; color: var(--blue); background: #EEF5FF; border: 1px solid #DDEBFF; border-radius: 999px; padding: 6px 12px; font-size: 13px; font-weight: 750; }
h1, h2, h3 { line-height: 1.25; margin: 0 0 14px; color: #17243B; }
h1 { font-size: clamp(32px, 9vw, 56px); letter-spacing: -1.5px; }
h2 { font-size: clamp(26px, 5.5vw, 38px); letter-spacing: -0.8px; }
h3 { font-size: 20px; }
p { margin: 0 0 16px; color: var(--muted); }
ul, ol { color: var(--muted); padding-left: 20px; }
.connection-workspace-hero {
    padding: 52px 0 46px;
    background: var(--gradient);
    color: var(--white);
    position: relative;
    overflow: hidden;
}
.connection-workspace-hero::after {
    content: "";
    position: absolute;
    inset: auto -20% -32% 20%;
    height: 260px;
    background: rgba(255,255,255,0.16);
    filter: blur(48px);
    border-radius: 999px;
}
.hero-grid { position: relative; z-index: 1; display: grid; gap: 28px; align-items: center; }
.hero-copy h1, .hero-copy p { color: var(--white); }
.hero-copy p { color: rgba(255,255,255,0.84); font-size: 17px; }
.security-tags { display: flex; flex-wrap: wrap; gap: 10px; margin: 20px 0 24px; }
.security-tags span { padding: 8px 12px; border: 1px solid rgba(255,255,255,0.28); background: rgba(255,255,255,0.14); border-radius: 999px; font-size: 13px; color: #fff; }
.hero-visual { position: relative; min-height: 360px; display: grid; place-items: center; }
.hero-device { width: min(360px, 80%); border-radius: 32px; box-shadow: 0 24px 70px rgba(18,30,62,0.28); }
.status-panel { background: rgba(255,255,255,0.94); color: var(--text); border: 1px solid rgba(255,255,255,0.65); border-radius: 24px; box-shadow: 0 20px 60px rgba(22,30,52,0.18); padding: 18px; }
.hero-status { position: absolute; width: min(270px, 78%); left: 0; bottom: 8px; }
.status-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 10px 0; border-bottom: 1px solid var(--line); font-size: 14px; }
.status-row:last-child { border-bottom: 0; }
.status-pill { color: #167E4D; background: #E8F8F0; border-radius: 999px; padding: 4px 10px; font-weight: 750; }
.float-card { position: absolute; right: 0; top: 22px; background: #fff; color: var(--text); border-radius: 20px; padding: 14px 16px; box-shadow: var(--shadow); font-size: 14px; }
.quick-task-entries { display: grid; gap: 16px; margin-top: -26px; position: relative; z-index: 3; }
.task-card, .capability-card, .info-card, .risk-card, .faq-item, .step-card, .scenario-card, .page-card {
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    padding: 22px;
    box-shadow: 0 12px 36px rgba(37,56,92,0.06);
}
.task-card small, .capability-card small { color: var(--blue); font-weight: 800; letter-spacing: .02em; }
.task-card h3, .capability-card h3 { margin-top: 10px; }
.connection-capability-overview { display: grid; gap: 16px; }
.capability-card.featured { background: linear-gradient(180deg, #FFFFFF 0%, #F2F7FF 100%); }
.feature-split { display: grid; gap: 24px; align-items: center; }
.feature-panel { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 26px; box-shadow: var(--shadow); }
.feature-panel img { border-radius: 24px; margin: 0 auto; }
.feature-list { display: grid; gap: 12px; margin-top: 18px; }
.feature-list div { padding: 14px; border-radius: 16px; background: #F6F9FE; border: 1px solid var(--line); color: var(--muted); }
.encrypted-tunnel-section .security-panel { display: grid; gap: 16px; }
.security-panel { background: var(--white); border-radius: var(--radius-lg); border: 1px solid var(--line); padding: 26px; box-shadow: var(--shadow); }
.three-grid, .scenario-grid, .risk-grid, .faq-grid { display: grid; gap: 16px; }
.route-board { display: grid; gap: 18px; }
.route-status { display: grid; gap: 12px; }
.route-status div { background: #fff; border: 1px solid var(--line); border-left: 4px solid var(--blue); border-radius: 18px; padding: 16px; }
.device-wall { display: grid; gap: 16px; }
.device-card { background: #fff; border: 1px solid var(--line); border-radius: 22px; padding: 18px; }
.data-boundary-panel { display: grid; gap: 16px; }
.data-boundary-panel .info-card { border-top: 4px solid var(--blue); }
.process-steps { display: grid; gap: 14px; counter-reset: step; }
.step-card { position: relative; padding-left: 74px; }
.step-card::before { counter-increment: step; content: counter(step); position: absolute; left: 22px; top: 24px; width: 34px; height: 34px; border-radius: 12px; background: var(--blue); color: #fff; display: grid; place-items: center; font-weight: 800; }
.risk-card { border-left: 4px solid var(--blue); }
.cta-section { padding: 62px 0; background: var(--gradient); color: #fff; text-align: center; }
.cta-section h2, .cta-section p { color: #fff; }
.cta-box { width: min(780px, calc(100% - 32px)); margin: 0 auto; }
.page-hero { padding: 48px 0 34px; background: linear-gradient(180deg, #F5F8FF 0%, #FFFFFF 100%); }
.page-hero-inner { display: grid; gap: 18px; max-width: 780px; }
.page-hero p { font-size: 17px; }
.page-layout { display: grid; gap: 24px; align-items: start; }
.article { background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 24px; box-shadow: var(--shadow); }
.article section + section { margin-top: 26px; padding-top: 24px; border-top: 1px solid var(--line); }
.side-panel { display: grid; gap: 16px; }
.check-list { display: grid; gap: 12px; padding: 0; margin: 0; list-style: none; }
.check-list li { background: #F6F9FE; border: 1px solid var(--line); border-radius: 16px; padding: 14px; color: var(--muted); }
.faq-item h3 { margin-bottom: 8px; }
.download-steps { display: grid; gap: 14px; margin-top: 18px; }
.download-steps .step-card { background: #fff; }
.site-footer { background: #17243B; color: rgba(255,255,255,0.72); padding: 46px 0 22px; }
.footer-grid { display: grid; gap: 24px; }
.footer-brand { color: #fff; font-size: 22px; font-weight: 850; margin-bottom: 10px; }
.site-footer h3 { color: #fff; font-size: 16px; margin-bottom: 12px; }
.site-footer a { display: block; color: rgba(255,255,255,0.72); margin: 7px 0; }
.site-footer a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.12); margin-top: 28px; padding-top: 18px; display: flex; flex-direction: column; gap: 8px; font-size: 13px; }
@media (min-width: 640px) {
    .quick-task-entries, .three-grid, .scenario-grid, .risk-grid, .faq-grid, .data-boundary-panel { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .connection-capability-overview { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .footer-grid { grid-template-columns: 1.4fr 1fr 1fr 1fr; }
    .footer-bottom { flex-direction: row; justify-content: space-between; }
}
@media (min-width: 860px) {
    .nav-toggle { display: none; }
    .site-nav { position: static; display: flex; align-items: center; gap: 2px; padding: 0; border: 0; box-shadow: none; background: transparent; }
    .site-nav a { font-size: 14px; }
    .hero-grid { grid-template-columns: 1.02fr .98fr; }
    .connection-workspace-hero { padding: 72px 0 68px; border-bottom-left-radius: 34px; border-bottom-right-radius: 34px; }
    .quick-task-entries { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .connection-capability-overview { grid-template-columns: repeat(4, minmax(0, 1fr)); grid-auto-rows: 1fr; }
    .capability-card.featured { grid-column: span 2; }
    .feature-split { grid-template-columns: 1fr 1fr; }
    .feature-split.reverse > :first-child { order: 2; }
    .encrypted-tunnel-section .security-panel { grid-template-columns: 1.1fr .9fr; align-items: center; }
    .three-grid, .scenario-grid, .risk-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .route-board { grid-template-columns: 1.1fr .9fr; }
    .device-wall { grid-template-columns: .9fr 1.1fr; align-items: center; }
    .data-boundary-panel { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .process-steps { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .page-layout { grid-template-columns: minmax(0, 1fr) 320px; }
    .article { padding: 34px; }
}
@media (min-width: 1080px) {
    .hero-visual { min-height: 460px; }
    .hero-device { width: 420px; }
    .section { padding: 76px 0; }
}
@media (max-width: 420px) {
    .container { width: min(100% - 24px, 1120px); }
    .task-card, .capability-card, .info-card, .risk-card, .faq-item, .step-card, .scenario-card, .page-card, .article, .feature-panel, .security-panel { padding: 18px; }
    .step-card { padding-left: 64px; }
    .download-btn { width: 100%; }
}