:root {
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --purple: #7B4EF1;
    --pink: #B84DDA;
    --dark: #1f2937;
    --text: #374151;
    --muted: #6b7280;
    --line: #e5e7eb;
    --soft: #f5f7fb;
    --soft-blue: #eef5ff;
    --white: #ffffff;
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --shadow: 0 18px 50px rgba(31, 41, 55, 0.09);
    --radius: 26px;
}
* { 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: #f7f9fc;
    line-height: 1.72;
    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; }
.section { padding: 58px 0; }
.gradient-bg { background: var(--gradient); color: #fff; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255,255,255,0.96);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid rgba(229,231,235,0.8);
}
.header-inner {
    width: min(1180px, calc(100% - 28px));
    margin: 0 auto;
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    flex-wrap: wrap;
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; color: var(--dark); font-size: 18px; }
.logo { width: 38px; height: 38px; border-radius: 12px; object-fit: cover; }
.nav-toggle { display: none; }
.nav-toggle-label {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    padding: 0 16px;
    border: 1px solid var(--line);
    border-radius: 999px;
    color: var(--dark);
    font-weight: 700;
    cursor: pointer;
}
.site-nav { display: none; width: 100%; flex-direction: column; gap: 6px; padding: 0 0 14px; }
.nav-toggle:checked ~ .site-nav { display: flex; }
.site-nav a {
    padding: 10px 12px;
    border-radius: 14px;
    color: #4b5563;
    font-size: 14px;
    font-weight: 650;
}
.site-nav a:hover, .site-nav a.active { color: var(--blue); background: var(--soft-blue); }
.connection-workspace-hero { padding: 54px 0 64px; position: relative; overflow: hidden; }
.connection-workspace-hero:before {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 82% 16%, rgba(255,255,255,.28), transparent 28%), radial-gradient(circle at 12% 86%, rgba(255,255,255,.16), transparent 28%);
}
.hero-grid { position: relative; display: grid; gap: 34px; align-items: center; }
.eyebrow, .category-badge {
    display: inline-flex;
    align-items: center;
    width: fit-content;
    padding: 7px 12px;
    border-radius: 999px;
    background: rgba(255,255,255,.16);
    color: #fff;
    font-size: 13px;
    font-weight: 800;
    letter-spacing: .02em;
}
.eyebrow.blue, .category-badge { background: var(--soft-blue); color: var(--blue); }
.hero-copy h1 { margin: 18px 0 16px; color: #fff; font-size: clamp(32px, 9vw, 58px); line-height: 1.12; letter-spacing: -0.04em; }
.hero-copy p { margin: 0 0 24px; color: rgba(255,255,255,.9); font-size: 16px; max-width: 660px; }
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 26px;
    border-radius: 999px;
    background: #2980FE;
    color: #fff;
    font-weight: 800;
    border: 0;
    box-shadow: 0 12px 24px rgba(41,128,254,.25);
    transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
}
.download-btn:hover { background: #1768E8; transform: translateY(-2px); box-shadow: 0 16px 28px rgba(23,104,232,.28); }
.trust-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.trust-tags span { padding: 8px 12px; background: rgba(255,255,255,.14); border: 1px solid rgba(255,255,255,.24); border-radius: 999px; color: #fff; font-size: 13px; }
.hero-visual { min-height: 420px; display: grid; place-items: center; }
.visual-shell {
    position: relative;
    width: min(440px, 100%);
    min-height: 420px;
    display: grid;
    place-items: center;
    border-radius: 34px;
    background: rgba(255,255,255,.14);
    box-shadow: inset 0 0 0 1px rgba(255,255,255,.22), 0 28px 80px rgba(0,0,0,.14);
}
.hero-img { width: min(300px, 74%); filter: drop-shadow(0 28px 36px rgba(0,0,0,.2)); }
.status-panel { background: rgba(255,255,255,.94); color: var(--dark); border: 1px solid rgba(255,255,255,.7); border-radius: 20px; padding: 14px 16px; box-shadow: var(--shadow); }
.status-panel strong { display: block; color: var(--dark); }
.status-panel span { color: var(--muted); font-size: 13px; }
.floating-panel { position: absolute; }
.top-panel { top: 28px; left: 18px; }
.bottom-panel { right: 16px; bottom: 34px; }
.hero-badges { position: absolute; bottom: 126px; left: 20px; display: grid; gap: 8px; }
.hero-badges span { background: rgba(255,255,255,.9); color: var(--blue); border-radius: 999px; padding: 8px 12px; font-weight: 800; font-size: 13px; }
.section-heading { margin: 0 auto 26px; max-width: 760px; text-align: center; }
.section-heading.compact { text-align: left; margin-left: 0; }
.section-heading h2, .split-copy h2, .feature-panel h2, .tunnel-grid h2, .page-hero h1, .content-main h2 { color: var(--dark); line-height: 1.2; }
.section-heading h2 { margin: 12px 0 10px; font-size: clamp(26px, 5vw, 42px); letter-spacing: -0.03em; }
.section-heading p { color: var(--muted); margin: 0; }
.quick-task-grid { display: grid; gap: 16px; }
.task-card, .capability-card, .mini-card-grid article, .boundary-grid article, .scenario-grid article, .process-steps article, .risk-grid article, .side-panel, .content-main, .faq-list details, .info-grid article {
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: 0 10px 28px rgba(31,41,55,.045);
}
.task-card { padding: 22px; }
.task-card span, .process-steps span { color: var(--blue); font-weight: 900; }
.task-card h3, .capability-card h3, .mini-card-grid h3, .boundary-grid h3, .scenario-grid h3, .risk-grid h3 { margin: 8px 0 8px; color: var(--dark); }
.task-card p, .capability-card p, .mini-card-grid p, .boundary-grid p, .scenario-grid p, .risk-grid p { margin: 0 0 12px; color: var(--muted); }
.task-card a, .capability-card a, .text-link, .scenario-grid a, .risk-grid a, .related-links a { color: var(--blue); font-weight: 800; }
.capability-grid { display: grid; gap: 16px; }
.capability-card { padding: 24px; position: relative; overflow: hidden; }
.capability-card.large { background: linear-gradient(180deg, #fff 0%, #f3f7ff 100%); }
.capability-card:before { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 4px; background: var(--gradient); }
.split-section, .feature-panel, .tunnel-grid { display: grid; gap: 24px; align-items: center; }
.split-copy h2, .feature-panel h2, .tunnel-grid h2 { margin: 12px 0 14px; font-size: clamp(26px, 5vw, 40px); }
.split-copy p, .feature-panel p, .tunnel-grid p { color: var(--muted); margin: 0 0 16px; }
.check-list, .step-list { padding-left: 20px; color: var(--text); }
.check-list li, .step-list li { margin: 6px 0; }
.card-media, .image-panel, .device-stack { background: var(--white); border: 1px solid var(--line); border-radius: 34px; padding: 20px; box-shadow: var(--shadow); }
.card-media img, .image-panel img { margin: 0 auto; max-height: 360px; object-fit: contain; }
.soft-panel { background: #eef3fb; }
.mini-card-grid { display: grid; gap: 14px; margin: 20px 0 12px; }
.mini-card-grid article { padding: 18px; }
.status-row { display: flex; flex-wrap: wrap; gap: 10px; margin: 20px 0; }
.status-row span { padding: 9px 12px; border-radius: 999px; background: var(--soft-blue); color: var(--blue); font-weight: 800; }
.device-stack { display: grid; grid-template-columns: 1fr; gap: 12px; }
.device-stack img { width: 100%; max-height: 260px; object-fit: contain; background: var(--soft); border-radius: 24px; padding: 12px; }
.boundary-grid, .scenario-grid, .risk-grid, .info-grid { display: grid; gap: 16px; }
.boundary-grid article, .scenario-grid article, .risk-grid article, .info-grid article { padding: 22px; }
.boundary-grid img { width: 100%; max-height: 220px; object-fit: contain; margin-bottom: 12px; }
.process-steps { display: grid; gap: 16px; }
.process-steps article { padding: 22px; }
.process-steps h3 { color: var(--dark); margin: 8px 0; }
.process-steps p { color: var(--muted); margin: 0 0 8px; }
.risk-grid article { border-left: 4px solid var(--blue); }
.risk-grid strong { display: block; color: var(--dark); margin-bottom: 4px; }
.faq-list { display: grid; gap: 12px; }
.faq-list details { padding: 18px 20px; }
.faq-list summary { cursor: pointer; color: var(--dark); font-weight: 850; }
.faq-list p { margin: 10px 0 0; color: var(--muted); }
.cta-section { text-align: center; padding: 66px 0; }
.cta-inner { max-width: 720px; }
.cta-inner h2 { color: #fff; margin: 14px 0 10px; font-size: clamp(26px, 6vw, 44px); }
.cta-inner p { color: rgba(255,255,255,.88); margin: 0 auto 24px; }
.page-main { padding-bottom: 60px; }
.page-hero { padding: 54px 0 28px; }
.page-hero h1 { font-size: clamp(32px, 7vw, 52px); margin: 18px 0 14px; letter-spacing: -0.035em; max-width: 880px; }
.page-hero p { max-width: 780px; color: var(--muted); font-size: 17px; margin: 0 0 22px; }
.content-layout { display: grid; gap: 20px; align-items: start; }
.content-main { padding: 24px; }
.content-main h2 { font-size: 24px; margin: 28px 0 10px; }
.content-main h2:first-child { margin-top: 0; }
.content-main p { color: var(--muted); margin: 0 0 14px; }
.side-panel { padding: 22px; }
.side-panel h3 { margin: 0 0 12px; color: var(--dark); }
.side-panel ul { padding-left: 18px; color: var(--muted); }
.side-card-list { display: grid; gap: 12px; }
.side-card-list article { padding: 14px; border-radius: 18px; background: var(--soft); border: 1px solid var(--line); }
.side-card-list h4 { margin: 0 0 6px; color: var(--dark); }
.side-card-list p { margin: 0; color: var(--muted); }
.related-links { margin-top: 28px; display: grid; gap: 10px; }
.related-links a { display: inline-flex; width: fit-content; padding: 8px 12px; border-radius: 999px; background: var(--soft-blue); }
.info-grid.two { grid-template-columns: 1fr; }
.step-list.large li { margin-bottom: 10px; }
.download-hero { border-bottom: 1px solid var(--line); }
.site-footer { background: #111827; color: #d1d5db; padding: 42px 0; }
.footer-inner { width: min(1120px, calc(100% - 32px)); margin: 0 auto; display: grid; gap: 22px; }
.footer-brand { display: flex; gap: 14px; align-items: flex-start; }
.footer-logo { width: 44px; height: 44px; border-radius: 14px; object-fit: cover; }
.footer-brand strong { color: #fff; }
.footer-brand p, .footer-note { margin: 6px 0 0; color: #9ca3af; }
.footer-links { display: flex; flex-wrap: wrap; gap: 10px 18px; }
.footer-links a { color: #e5e7eb; }
@media (min-width: 640px) {
    .quick-task-grid, .boundary-grid, .scenario-grid, .risk-grid, .info-grid.two { grid-template-columns: repeat(2, 1fr); }
    .capability-grid { grid-template-columns: repeat(2, 1fr); }
    .mini-card-grid { grid-template-columns: repeat(3, 1fr); }
    .device-stack { grid-template-columns: repeat(2, 1fr); }
    .process-steps { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 900px) {
    .nav-toggle-label { display: none; }
    .site-nav { display: flex; width: auto; flex-direction: row; align-items: center; gap: 2px; padding: 0; }
    .site-nav a { padding: 9px 10px; }
    .hero-grid { grid-template-columns: 1.05fr .95fr; }
    .connection-workspace-hero { padding: 86px 0 78px; }
    .quick-task-grid { grid-template-columns: repeat(4, 1fr); }
    .capability-grid { grid-template-columns: repeat(6, 1fr); }
    .capability-card { grid-column: span 2; }
    .capability-card.large { grid-column: span 2; min-height: 210px; }
    .split-section, .feature-panel, .tunnel-grid { grid-template-columns: 1fr 1fr; }
    .feature-panel.reverse .image-panel { order: 0; }
    .risk-grid { grid-template-columns: repeat(3, 1fr); }
    .scenario-grid { grid-template-columns: repeat(3, 1fr); }
    .boundary-grid { grid-template-columns: 1.2fr 1fr 1fr; }
    .content-layout { grid-template-columns: minmax(0, 1fr) 320px; }
    .content-main { padding: 34px; }
    .page-hero { padding: 70px 0 34px; }
    .process-steps { grid-template-columns: repeat(3, 1fr); }
}
@media (min-width: 1120px) {
    .site-nav a { padding: 10px 12px; }
}