:root {
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --text: #202633;
    --muted: #667085;
    --light: #F5F7FB;
    --line: #E6EAF2;
    --card: #FFFFFF;
    --soft-blue: #EEF5FF;
    --radius-lg: 30px;
    --radius-md: 22px;
    --shadow: 0 18px 50px rgba(35, 56, 115, 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: #FFFFFF;
    line-height: 1.7;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--line);
}
.header-inner { min-height: 68px; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 800; color: #14213D; }
.logo img { width: 38px; height: 38px; border-radius: 12px; object-fit: cover; }
.nav-toggle {
    border: 1px solid var(--line);
    background: #fff;
    color: var(--text);
    border-radius: 999px;
    padding: 8px 14px;
    font-weight: 700;
}
.site-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 72px;
    display: none;
    flex-direction: column;
    gap: 8px;
    padding: 16px;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: #fff;
    box-shadow: var(--shadow);
}
.site-nav.is-open { display: flex; }
.site-nav a { color: #344054; font-weight: 700; padding: 9px 10px; border-radius: 12px; }
.site-nav a:hover { background: var(--soft-blue); color: var(--blue); }
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 24px;
    border-radius: 999px;
    background: #2980FE;
    color: #fff;
    font-weight: 800;
    box-shadow: 0 12px 28px rgba(41,128,254,0.28);
    transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}
.download-btn:hover { background: #1768E8; transform: translateY(-2px); box-shadow: 0 16px 34px rgba(23,104,232,0.30); }
.section { padding: 58px 0; }
.section-muted { background: var(--light); }
.section-head { max-width: 760px; margin-bottom: 28px; }
.section-head.center { text-align: center; margin-left: auto; margin-right: auto; }
.eyebrow, .category-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--blue);
    background: var(--soft-blue);
    border: 1px solid #D9E8FF;
    border-radius: 999px;
    padding: 6px 12px;
    font-size: 14px;
    font-weight: 800;
    margin-bottom: 12px;
}
h1, h2, h3 { line-height: 1.22; margin: 0 0 14px; color: #182230; }
h1 { font-size: clamp(34px, 8vw, 58px); letter-spacing: -0.04em; }
h2 { font-size: clamp(26px, 5vw, 40px); letter-spacing: -0.03em; }
h3 { font-size: 20px; }
p { margin: 0 0 14px; color: var(--muted); }
.connection-workspace-hero {
    margin: 22px auto 0;
    padding: 54px 0;
    background: var(--gradient);
    color: #fff;
    border-radius: 0 0 34px 34px;
    position: relative;
    overflow: hidden;
}
.connection-workspace-hero:before {
    content: "";
    position: absolute;
    inset: -20% -12% auto auto;
    width: 420px;
    height: 420px;
    background: rgba(255,255,255,0.16);
    border-radius: 50%;
    filter: blur(4px);
}
.hero-grid { position: relative; display: grid; gap: 34px; align-items: center; }
.hero-copy h1, .hero-copy p { color: #fff; }
.hero-copy p { max-width: 660px; opacity: .92; font-size: 18px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin: 18px 0 24px; }
.hero-tags span { border: 1px solid rgba(255,255,255,.36); background: rgba(255,255,255,.14); padding: 8px 12px; border-radius: 999px; font-weight: 700; }
.hero-visual { position: relative; min-height: 360px; }
.hero-device {
    width: min(420px, 92%);
    margin: 0 auto;
    border-radius: 34px;
    box-shadow: 0 24px 70px rgba(17,24,39,.22);
}
.status-panel {
    background: rgba(255,255,255,.94);
    color: var(--text);
    border-radius: 26px;
    padding: 18px;
    border: 1px solid rgba(255,255,255,.5);
    box-shadow: var(--shadow);
}
.hero-status { position: absolute; right: 0; bottom: 0; width: min(310px, 88%); }
.status-row { display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); padding: 10px 0; font-weight: 700; }
.status-row:last-child { border-bottom: 0; }
.status-dot { width: 10px; height: 10px; border-radius: 50%; background: #12B76A; box-shadow: 0 0 0 7px rgba(18,183,106,.12); }
.quick-task-entries, .risk-grid, .scenario-grid, .faq-grid, .simple-grid { display: grid; grid-template-columns: 1fr; gap: 16px; }
.quick-task-card, .task-card, .capability-card, .info-card, .faq-item, .risk-card, .step-card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    padding: 22px;
    box-shadow: 0 10px 30px rgba(34,46,84,.06);
}
.quick-task-card .tag, .card-link, .mini-link { color: var(--blue); font-weight: 800; }
.card-link { display: inline-flex; margin-top: 8px; }
.connection-capability-overview { display: grid; grid-template-columns: 1fr; gap: 16px; }
.capability-card.featured { background: linear-gradient(180deg, #fff 0%, #F4F8FF 100%); }
.capability-card .label { color: var(--blue); font-size: 13px; font-weight: 900; }
.split-section { display: grid; grid-template-columns: 1fr; gap: 26px; align-items: center; }
.visual-card, .safety-panel, .route-panel, .device-panel, .data-panel, .checkup-panel {
    border-radius: var(--radius-lg);
    border: 1px solid var(--line);
    background: #fff;
    box-shadow: var(--shadow);
    padding: 24px;
}
.visual-card img { border-radius: 24px; margin: 0 auto; }
.feature-list { display: grid; gap: 12px; margin: 18px 0; padding: 0; list-style: none; }
.feature-list li { padding: 12px 14px; border-radius: 16px; background: var(--light); color: #475467; }
.encrypted-tunnel-section .safety-panel { background: linear-gradient(135deg, #FFFFFF 0%, #F3F7FF 100%); }
.security-tags { display: flex; flex-wrap: wrap; gap: 10px; margin: 16px 0; }
.security-tags span { padding: 8px 12px; border-radius: 999px; background: var(--soft-blue); color: var(--blue); font-weight: 800; }
.line-status { display: grid; gap: 12px; margin-top: 16px; }
.line-status div { padding: 14px; border: 1px solid var(--line); border-radius: 16px; background: #fff; }
.data-points { display: grid; gap: 14px; }
.process-steps { display: grid; grid-template-columns: 1fr; gap: 16px; counter-reset: step; }
.step-card { position: relative; padding-left: 70px; }
.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: 900;
}
.risk-card { border-left: 4px solid var(--blue); }
.cta-section {
    margin: 50px 0;
    background: var(--gradient);
    border-radius: var(--radius-lg);
    padding: 46px 24px;
    text-align: center;
    color: #fff;
    overflow: hidden;
}
.cta-section h2, .cta-section p { color: #fff; }
.page-hero { padding: 54px 0 24px; background: linear-gradient(180deg, #F7FAFF 0%, #fff 100%); }
.page-hero .page-copy { max-width: 850px; }
.content-layout { display: grid; grid-template-columns: 1fr; gap: 24px; align-items: start; }
.content-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 26px; box-shadow: var(--shadow); }
.aside-card { background: var(--light); border: 1px solid var(--line); border-radius: var(--radius-md); padding: 22px; }
.check-list { margin: 0; padding: 0; list-style: none; display: grid; gap: 12px; }
.check-list li { padding: 13px 14px; background: #fff; border: 1px solid var(--line); border-radius: 14px; color: #475467; }
.download-focus { text-align: center; max-width: 820px; margin: 0 auto; }
.install-steps { display: grid; gap: 14px; margin: 24px 0; }
.install-step { background: #fff; border: 1px solid var(--line); border-radius: 18px; padding: 18px; }
.faq-item h3 { font-size: 18px; }
.site-footer { background: #101828; color: #D0D5DD; padding: 46px 0 24px; }
.footer-grid { display: grid; grid-template-columns: 1fr; gap: 26px; }
.site-footer h3, .footer-brand { color: #fff; font-weight: 900; margin-bottom: 10px; }
.site-footer a { display: block; color: #D0D5DD; margin: 8px 0; }
.site-footer p { color: #C5CCD8; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.12); margin-top: 28px; padding-top: 18px; color: #98A2B3; }
@media (min-width: 640px) {
    .quick-task-entries, .risk-grid, .scenario-grid, .faq-grid, .simple-grid { grid-template-columns: repeat(2, 1fr); }
    .connection-capability-overview { grid-template-columns: repeat(2, 1fr); }
    .process-steps { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 920px) {
    .nav-toggle { display: none; }
    .site-nav { position: static; display: flex; flex-direction: row; align-items: center; gap: 4px; padding: 0; border: 0; box-shadow: none; background: transparent; }
    .site-nav a { font-size: 14px; }
    .connection-workspace-hero { padding: 76px 0; border-radius: 0 0 42px 42px; }
    .hero-grid { grid-template-columns: 1.05fr .95fr; }
    .quick-task-entries { grid-template-columns: repeat(4, 1fr); margin-top: -34px; position: relative; z-index: 2; }
    .connection-capability-overview { grid-template-columns: repeat(4, 1fr); grid-auto-flow: dense; }
    .capability-card.featured { grid-column: span 2; min-height: 230px; }
    .split-section { grid-template-columns: 1fr 1fr; }
    .encrypted-tunnel-section .split-section { grid-template-columns: 1.15fr .85fr; }
    .data-points { grid-template-columns: repeat(3, 1fr); }
    .risk-grid { grid-template-columns: repeat(3, 1fr); }
    .scenario-grid { grid-template-columns: repeat(3, 1fr); }
    .content-layout { grid-template-columns: minmax(0, 1fr) 330px; }
    .footer-grid { grid-template-columns: 1.4fr 1fr 1fr 1fr; }
}
@media (max-width: 420px) {
    .container { width: min(100% - 24px, 1120px); }
    .section { padding: 44px 0; }
    .hero-status { position: relative; width: 100%; margin-top: -12px; }
    .download-btn { width: 100%; }
    .content-card, .visual-card, .safety-panel, .route-panel, .device-panel, .data-panel, .checkup-panel { padding: 20px; border-radius: 24px; }
}