:root {
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue: #2980FE;
    --blue-dark: #1768E8;
    --text: #202638;
    --muted: #687084;
    --line: #E6EAF2;
    --light: #F6F8FC;
    --soft-blue: #EEF5FF;
    --white: #FFFFFF;
    --radius-lg: 30px;
    --radius-md: 22px;
    --shadow: 0 18px 46px rgba(35, 72, 140, .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: #fff;
    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; }
.section { padding: 58px 0; }
.section-muted { background: var(--light); }
.section-title { margin: 0 0 14px; font-size: clamp(28px, 5vw, 44px); line-height: 1.18; letter-spacing: -.03em; }
.section-lead { margin: 0 0 28px; color: var(--muted); max-width: 760px; }
.eyebrow, .category-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--blue);
    background: #EEF5FF;
    border: 1px solid #D9E8FF;
    border-radius: 999px;
    padding: 6px 12px;
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 14px;
}
.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255,255,255,.94);
    backdrop-filter: blur(14px);
    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: 18px;
}
.logo { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; color: #17203A; }
.logo img { width: 38px; height: 38px; border-radius: 12px; object-fit: cover; }
.nav-toggle { position: absolute; opacity: 0; pointer-events: none; }
.nav-toggle-label {
    width: 42px;
    height: 42px;
    border: 1px solid var(--line);
    border-radius: 14px;
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    background: #fff;
}
.nav-toggle-label span { width: 19px; height: 2px; background: #2F3854; border-radius: 2px; }
.main-nav {
    position: absolute;
    top: 70px;
    left: 14px;
    right: 14px;
    display: none;
    padding: 12px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 20px;
    box-shadow: var(--shadow);
}
.nav-toggle:checked ~ .main-nav { display: grid; grid-template-columns: 1fr; gap: 6px; }
.main-nav a {
    padding: 10px 12px;
    border-radius: 12px;
    color: #4A5368;
    font-size: 14px;
    font-weight: 700;
}
.main-nav a:hover, .main-nav a.active { background: var(--soft-blue); color: var(--blue); }
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 26px;
    border-radius: 999px;
    background: var(--blue);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 12px 28px rgba(41,128,254,.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,.27); }
.connection-workspace-hero {
    background: var(--gradient);
    color: #fff;
    padding: 54px 0 34px;
    position: relative;
    overflow: hidden;
}
.connection-workspace-hero::before, .connection-workspace-hero::after {
    content: "";
    position: absolute;
    width: 310px;
    height: 310px;
    border-radius: 50%;
    background: rgba(255,255,255,.14);
    filter: blur(2px);
}
.connection-workspace-hero::before { top: -140px; right: -80px; }
.connection-workspace-hero::after { bottom: -160px; left: -110px; }
.hero-grid {
    position: relative;
    z-index: 1;
    display: grid;
    gap: 28px;
    align-items: center;
}
.hero-copy h1 { margin: 0 0 16px; font-size: clamp(34px, 8vw, 64px); line-height: 1.06; letter-spacing: -.05em; }
.hero-copy p { margin: 0 0 24px; color: rgba(255,255,255,.88); font-size: 17px; max-width: 640px; }
.hero-tags, .panel-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.hero-tags span, .panel-tags span {
    display: inline-flex;
    align-items: center;
    border: 1px solid rgba(255,255,255,.35);
    background: rgba(255,255,255,.12);
    color: #fff;
    border-radius: 999px;
    padding: 7px 12px;
    font-size: 13px;
    font-weight: 700;
}
.hero-visual { position: relative; min-height: 330px; display: grid; place-items: center; }
.hero-device {
    width: min(420px, 86vw);
    padding: 16px;
    border-radius: 34px;
    background: rgba(255,255,255,.18);
    border: 1px solid rgba(255,255,255,.24);
    box-shadow: 0 30px 80px rgba(22,35,77,.22);
}
.hero-device img { border-radius: 26px; }
.status-panel {
    background: rgba(255,255,255,.94);
    color: var(--text);
    border: 1px solid rgba(255,255,255,.6);
    border-radius: 24px;
    padding: 18px;
    box-shadow: var(--shadow);
}
.hero-status {
    position: relative;
    width: 100%;
    max-width: 340px;
    margin: -30px auto 0;
}
.status-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 9px 0; border-bottom: 1px solid var(--line); }
.status-row:last-child { border-bottom: 0; }
.status-row strong { font-size: 14px; }
.status-dot { display: inline-flex; width: 10px; height: 10px; border-radius: 50%; background: #2FC36B; box-shadow: 0 0 0 6px rgba(47,195,107,.14); }
.quick-task-entries { margin-top: -10px; position: relative; z-index: 2; }
.quick-grid { display: grid; gap: 16px; }
.task-card, .capability-card, .info-card, .risk-card, .faq-item, .step-card, .page-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    padding: 22px;
    box-shadow: 0 10px 28px rgba(31,59,113,.06);
}
.task-card .tag, .capability-card .tag { display: inline-flex; color: var(--blue); font-weight: 800; font-size: 13px; margin-bottom: 8px; }
.task-card h3, .capability-card h3, .info-card h3, .risk-card h3, .step-card h3, .page-card h3 { margin: 0 0 8px; font-size: 20px; line-height: 1.3; }
.task-card p, .capability-card p, .info-card p, .risk-card p, .step-card p, .page-card p { margin: 0 0 14px; color: var(--muted); }
.text-link { color: var(--blue); font-weight: 800; }
.connection-capability-overview { display: grid; gap: 16px; }
.capability-card.featured { background: linear-gradient(180deg, #fff 0%, #F5F9FF 100%); }
.split-section {
    display: grid;
    gap: 26px;
    align-items: center;
}
.visual-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 18px;
    box-shadow: var(--shadow);
}
.visual-card img { border-radius: 22px; margin: auto; }
.bullet-list { display: grid; gap: 12px; margin: 20px 0; padding: 0; list-style: none; }
.bullet-list li { position: relative; padding-left: 26px; color: #465067; }
.bullet-list li::before { content: ""; position: absolute; left: 0; top: 11px; width: 10px; height: 10px; border-radius: 50%; background: var(--blue); }
.encrypted-tunnel-section .security-panel,
.safety-panel {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow);
}
.security-grid, .scenario-grid, .risk-grid, .page-grid { display: grid; gap: 16px; }
.route-panel {
    background: linear-gradient(180deg, #F8FBFF 0%, #fff 100%);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 24px;
}
.route-meter { display: grid; gap: 12px; margin-top: 18px; }
.route-line { display: grid; grid-template-columns: 92px 1fr auto; gap: 10px; align-items: center; color: #4D5870; font-size: 14px; }
.route-line i { display: block; height: 8px; border-radius: 999px; background: linear-gradient(90deg, #2980FE, #9FBFFF); }
.data-strip {
    display: grid;
    gap: 16px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 22px;
    box-shadow: var(--shadow);
}
.data-strip img { border-radius: 22px; }
.process-steps { display: grid; gap: 14px; counter-reset: step; }
.step-card { position: relative; padding-top: 52px; }
.step-card::before {
    counter-increment: step;
    content: counter(step, decimal-leading-zero);
    position: absolute;
    left: 22px;
    top: 18px;
    color: var(--blue);
    font-size: 18px;
    font-weight: 900;
}
.risk-card { border-left: 4px solid var(--blue); }
.faq-list { display: grid; gap: 14px; }
.faq-item h3 { margin: 0 0 8px; font-size: 18px; }
.faq-item p { margin: 0; color: var(--muted); }
.cta-section {
    background: var(--gradient);
    color: #fff;
    border-radius: var(--radius-lg);
    padding: 34px;
    text-align: center;
    position: relative;
    overflow: hidden;
}
.cta-section p { color: rgba(255,255,255,.86); margin: 0 auto 22px; max-width: 680px; }
.page-hero {
    background: linear-gradient(180deg, #F7FAFF 0%, #fff 100%);
    padding: 46px 0 28px;
    border-bottom: 1px solid var(--line);
}
.page-hero h1 { margin: 0 0 14px; font-size: clamp(32px, 7vw, 54px); line-height: 1.12; letter-spacing: -.04em; }
.page-hero p { margin: 0; color: var(--muted); max-width: 820px; }
.article-layout { display: grid; gap: 22px; align-items: start; }
.article-main {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: 0 10px 30px rgba(31,59,113,.06);
}
.article-main h2 { margin-top: 0; font-size: 26px; }
.article-main p { color: #4B556D; }
.side-panel { display: grid; gap: 16px; }
.check-list { display: grid; gap: 10px; padding: 0; margin: 14px 0 0; list-style: none; }
.check-list li { padding: 12px 14px; background: var(--light); border: 1px solid var(--line); border-radius: 14px; color: #4D5870; }
.download-zone { margin-top: 24px; }
.site-footer { background: #111827; color: rgba(255,255,255,.76); padding: 46px 0 18px; }
.footer-grid { display: grid; gap: 24px; }
.footer-brand { color: #fff; font-size: 20px; font-weight: 900; margin-bottom: 10px; }
.site-footer h3 { color: #fff; margin: 0 0 12px; font-size: 16px; }
.site-footer a { display: block; color: rgba(255,255,255,.72); margin: 8px 0; }
.site-footer a:hover { color: #fff; }
.footer-bottom { width: min(1120px, calc(100% - 32px)); margin: 28px auto 0; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.12); font-size: 13px; color: rgba(255,255,255,.55); }
@media (min-width: 680px) {
    .quick-grid, .security-grid, .scenario-grid, .risk-grid, .page-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .connection-capability-overview { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .process-steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .data-strip { grid-template-columns: 1.1fr .9fr; align-items: center; }
    .footer-grid { grid-template-columns: 1.3fr 1fr 1fr 1fr; }
}
@media (min-width: 960px) {
    .section { padding: 82px 0; }
    .nav-toggle-label { display: none; }
    .main-nav { position: static; display: flex; align-items: center; gap: 2px; padding: 0; border: 0; box-shadow: none; background: transparent; }
    .hero-grid { grid-template-columns: 1.05fr .95fr; }
    .hero-status { position: absolute; right: 0; bottom: 10px; margin: 0; }
    .quick-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .connection-capability-overview { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .capability-card.featured { grid-column: span 2; min-height: 220px; }
    .split-section { grid-template-columns: 1fr 1fr; gap: 44px; }
    .security-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .scenario-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .risk-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .process-steps { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .article-layout { grid-template-columns: minmax(0, 1fr) 320px; }
    .article-main { padding: 34px; }
}
@media (max-width: 420px) {
    .container { width: min(100% - 24px, 1120px); }
    .section { padding: 46px 0; }
    .connection-workspace-hero { padding-top: 42px; }
    .download-btn { width: 100%; }
    .hero-tags span, .panel-tags span { font-size: 12px; }
    .task-card, .capability-card, .info-card, .risk-card, .faq-item, .step-card, .page-card, .article-main { padding: 18px; }
}