:root {
    --bg: #F8FAFC;
    --panel: #FFFFFF;
    --ink: #0F172A;
    --muted: #475569;
    --line: #E2E8F0;
    --indigo: #4F46E5;
    --indigo-soft: #EEF2FF;
    --indigo-mid: #818CF8;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
    font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    background: var(--bg);
    color: var(--ink);
    line-height: 1.7;
}

img, svg { display: block; }

a { color: var(--indigo); text-decoration: none; }

.wrap {
    width: min(1120px, calc(100% - 40px));
    margin: 0 auto;
}

.wrap.wide { width: min(980px, calc(100% - 40px)); }

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: var(--panel);
    border-bottom: 1px solid var(--line);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 68px;
    gap: 24px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--ink);
    font-weight: 700;
    letter-spacing: 0.02em;
}

.brand-mark {
    width: 32px;
    height: 32px;
    color: var(--indigo);
}

.nav { display: flex; gap: 22px; }

.nav a {
    color: var(--muted);
    font-size: 14px;
    padding: 6px 0;
    border-bottom: 2px solid transparent;
}

.nav a:hover { color: var(--indigo); border-bottom-color: var(--indigo); }

.hero {
    padding: 56px 0 40px;
    background:
        linear-gradient(180deg, #EEF2FF 0%, #F8FAFC 70%);
    border-bottom: 1px solid var(--line);
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.05fr 0.95fr;
    gap: 48px;
    align-items: center;
}

.kicker {
    color: var(--indigo);
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    margin-bottom: 10px;
}

.hero h1 {
    font-size: clamp(28px, 4vw, 40px);
    line-height: 1.25;
    margin-bottom: 16px;
}

.hero-copy p { color: var(--muted); margin-bottom: 12px; }

.btn {
    display: inline-block;
    margin-top: 10px;
    background: var(--indigo);
    color: #fff;
    font-weight: 700;
    padding: 12px 28px;
    border-radius: 6px;
}

.btn:hover { background: #4338CA; }

.device-scene {
    position: relative;
    min-height: 280px;
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 28px 20px 20px;
    display: grid;
    grid-template-columns: 1.3fr 0.7fr 0.7fr;
    align-items: end;
}

.monitor { grid-column: 1; }

.monitor-bezel {
    width: 100%;
    max-width: 260px;
    border: 3px solid var(--indigo);
    border-radius: 8px;
    padding: 8px;
    background: var(--indigo-soft);
}

.monitor-screen {
    background: #fff;
    border: 1px solid #C7D2FE;
    min-height: 120px;
    padding: 14px;
}

.monitor-screen .bar,
.phone-screen .dotline {
    display: block;
    height: 8px;
    background: #C7D2FE;
    margin-bottom: 10px;
}

.bar.short { width: 62%; }
.bar.mid { width: 78%; }
.dotline.slim { width: 55%; }

.monitor-neck {
    width: 16px;
    height: 22px;
    margin: 0 auto;
    background: var(--indigo);
}

.monitor-base {
    width: 90px;
    height: 8px;
    margin: 0 auto;
    background: var(--indigo);
    border-radius: 4px;
}

.link-lines {
    width: 100%;
    height: 90px;
    align-self: center;
}

.phone-shell {
    width: 78px;
    margin-left: auto;
    border: 3px solid var(--indigo);
    border-radius: 12px;
    padding: 10px 8px 12px;
    background: var(--indigo-soft);
}

.phone-ear {
    display: block;
    width: 22px;
    height: 4px;
    margin: 0 auto 8px;
    background: var(--indigo-mid);
    border-radius: 2px;
}

.phone-screen {
    background: #fff;
    border: 1px solid #C7D2FE;
    min-height: 110px;
    padding: 10px 8px;
}

.section { padding: 64px 0; }

.section.alt { background: #fff; border-block: 1px solid var(--line); }

.section h2 {
    font-size: clamp(22px, 3vw, 30px);
    line-height: 1.35;
    margin-bottom: 12px;
}

.lead { color: var(--muted); margin-bottom: 28px; max-width: 46em; }

.portal-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.portal-card {
    background: var(--panel);
    border: 1px solid var(--line);
    border-left: 6px solid var(--indigo);
    padding: 24px 24px 22px;
    min-height: 220px;
}

.portal-card svg {
    width: 40px;
    height: 40px;
    color: var(--indigo);
    margin-bottom: 12px;
}

.portal-card h3 { font-size: 18px; margin-bottom: 8px; }

.portal-card p { color: var(--muted); font-size: 15px; margin-bottom: 8px; }

.split-list {
    list-style: none;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
}

.split-list li {
    background: var(--panel);
    border: 1px solid var(--line);
    padding: 20px;
}

.split-list p { color: var(--muted); margin-top: 6px; }

.mini-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.mini-row article {
    background: var(--indigo-soft);
    padding: 20px;
    border: 1px solid #C7D2FE;
}

.mini-row h3 { font-size: 16px; margin-bottom: 8px; }
.mini-row p { color: var(--muted); font-size: 15px; }

.encrypt-box {
    background: var(--panel);
    border: 1px solid var(--line);
    padding: 32px;
}

.encrypt-box p { color: var(--muted); margin-bottom: 10px; }

.encrypt-box ul {
    margin-top: 16px;
    padding-left: 18px;
    color: var(--muted);
}

.chip-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.chip-grid article {
    background: var(--panel);
    border-top: 3px solid var(--indigo);
    padding: 20px;
    box-shadow: 0 1px 0 var(--line);
}

.chip-grid h3 { margin-bottom: 8px; font-size: 16px; }
.chip-grid p { color: var(--muted); }

.table-wrap { overflow-x: auto; }

table {
    width: 100%;
    border-collapse: collapse;
    background: var(--panel);
}

caption {
    text-align: left;
    font-weight: 700;
    margin-bottom: 12px;
}

th, td {
    border: 1px solid var(--line);
    padding: 12px 14px;
    text-align: left;
    vertical-align: top;
    font-size: 14px;
}

th { background: var(--indigo); color: #fff; }

tr:nth-child(even) td { background: #F1F5F9; }

.gap-list {
    padding-left: 22px;
    color: var(--muted);
}

.gap-list li { margin-bottom: 10px; }

.track-section { background: var(--indigo-soft); }

.track-title {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 8px;
}

.connect-track {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0;
    position: relative;
    margin-top: 12px;
}

.connect-track::before {
    content: "";
    position: absolute;
    top: 18px;
    left: 8%;
    right: 8%;
    height: 2px;
    background: var(--indigo);
}

.connect-track li {
    position: relative;
    padding: 0 12px;
    text-align: center;
}

.connect-track .node {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--indigo);
    color: #fff;
    font-weight: 700;
    margin-bottom: 12px;
    position: relative;
    z-index: 1;
}

.connect-track strong { display: block; margin-bottom: 6px; }
.connect-track p { color: var(--muted); font-size: 14px; }

.faq-wide details {
    background: var(--panel);
    border: 1px solid var(--line);
    margin-bottom: 10px;
}

.faq-wide summary {
    cursor: pointer;
    padding: 16px 20px;
    font-weight: 700;
    list-style: none;
}

.faq-wide summary::-webkit-details-marker { display: none; }

.faq-wide details[open] summary { color: var(--indigo); }

.faq-wide p {
    padding: 0 20px 16px;
    color: var(--muted);
}

.site-footer {
    background: #0F172A;
    color: #CBD5E1;
    padding: 36px 0;
}

.site-footer p { margin-bottom: 8px; font-size: 14px; }

@media (max-width: 900px) {
    .hero-grid,
    .portal-grid,
    .split-list,
    .mini-row,
    .chip-grid,
    .connect-track { grid-template-columns: 1fr; }

    .header-inner { flex-direction: column; padding: 12px 0; }

    .connect-track::before { display: none; }

    .device-scene { grid-template-columns: 1fr; justify-items: center; gap: 8px; }
    .phone-shell { margin: 0 auto; }
}

#news .news-list { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
#news article { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 16px 18px; box-shadow: 0 0 0 1px rgba(79,70,229,.04); }
#news article:last-child { grid-column: 1 / -1; }
#news h3 { margin: 0 0 8px; color: var(--ink); font-size: 16px; }
#news time { color: var(--indigo); font-size: 12px; }
#news p { margin: 8px 0 0; color: var(--muted); font-size: 14px; }
@media (max-width: 800px) { #news .news-list { grid-template-columns: 1fr; } #news article:last-child { grid-column: auto; } }