:root {
    --primary: rgb(70,139,223);
    --primary-strong: rgb(44,111,197);
    --ink: #122033;
    --muted: #64748b;
    --soft: #f5f9ff;
    --soft-2: #eef6ff;
    --line: #dbe8f7;
    --white: #ffffff;
    --shadow: 0 18px 48px rgba(39, 83, 132, 0.10);
    --shadow-soft: 0 12px 30px rgba(39, 83, 132, 0.08);
    --radius: 22px;
}

* { 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(--ink);
    background: linear-gradient(180deg, #f8fbff 0%, #ffffff 42%, #f6faff 100%);
    line-height: 1.75;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255,255,255,0.88);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(219,232,247,0.75);
}
.nav-wrap {
    max-width: 1180px;
    margin: 0 auto;
    padding: 14px 18px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}
.brand, .footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    letter-spacing: -0.02em;
}
.brand img, .footer-brand img { width: 34px; height: 34px; border-radius: 12px; }
.nav-toggle {
    width: 42px;
    height: 42px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: var(--white);
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    cursor: pointer;
}
.nav-toggle span { width: 18px; height: 2px; background: var(--ink); border-radius: 2px; }
.site-nav {
    position: absolute;
    left: 18px;
    right: 18px;
    top: 68px;
    padding: 12px;
    display: none;
    flex-direction: column;
    gap: 6px;
    background: rgba(255,255,255,0.96);
    border: 1px solid var(--line);
    border-radius: 20px;
    box-shadow: var(--shadow-soft);
}
.site-nav.open { display: flex; }
.site-nav a {
    padding: 10px 12px;
    border-radius: 12px;
    color: #40526b;
    font-size: 14px;
}
.site-nav a.active, .site-nav a:hover { color: var(--primary); background: var(--soft-2); }

.section { padding: 56px 18px; }
.container { max-width: 1180px; margin: 0 auto; }
.narrow { max-width: 820px; margin: 0 auto; }
.eyebrow, .badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 12px;
    border: 1px solid rgba(70,139,223,0.18);
    border-radius: 999px;
    background: rgba(70,139,223,0.08);
    color: var(--primary-strong);
    font-size: 13px;
    font-weight: 700;
}
.section-title { margin: 0 0 12px; font-size: clamp(28px, 5vw, 44px); line-height: 1.16; letter-spacing: -0.04em; }
.section-lead { margin: 0 0 26px; color: var(--muted); font-size: 16px; }
.center { text-align: center; }

.centered-hero {
    padding: 80px 18px 36px;
    position: relative;
    overflow: hidden;
}
.centered-hero:before {
    content: "";
    position: absolute;
    inset: -120px -40px auto -40px;
    height: 420px;
    background: radial-gradient(circle at 50% 20%, rgba(70,139,223,0.20), rgba(70,139,223,0) 58%);
    pointer-events: none;
}
.hero-inner { position: relative; max-width: 920px; margin: 0 auto; text-align: center; }
.hero-inner h1 {
    margin: 18px 0 16px;
    font-size: clamp(38px, 8vw, 76px);
    line-height: 1.04;
    letter-spacing: -0.07em;
}
.hero-inner p { max-width: 760px; margin: 0 auto 28px; color: #51637d; font-size: 17px; }
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 26px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 14px 30px rgba(70,139,223,0.26);
    transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}
.download-btn:hover { transform: translateY(-2px); background: var(--primary-strong); box-shadow: 0 18px 36px rgba(70,139,223,0.32); }
.security-tags { margin-top: 18px; display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; }
.security-tags span, .tag {
    padding: 8px 12px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: rgba(255,255,255,0.76);
    color: #445872;
    font-size: 13px;
}

.product-bento {
    margin-top: 36px;
    display: grid;
    gap: 16px;
}
.product-main {
    border: 1px solid rgba(219,232,247,0.95);
    border-radius: 28px;
    background: linear-gradient(145deg, #ffffff 0%, #eef6ff 100%);
    box-shadow: var(--shadow);
    padding: 24px;
    overflow: hidden;
}
.product-phone {
    max-width: 330px;
    margin: 12px auto 0;
    filter: drop-shadow(0 28px 34px rgba(38,72,111,0.18));
}
.status-grid { display: grid; gap: 14px; }
.status-card, .card, .category-card, .faq-item, .scenario-card, .principle-card, .step-card, .doc-card {
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: rgba(255,255,255,0.88);
    box-shadow: var(--shadow-soft);
}
.status-card { padding: 18px; }
.status-card small { color: var(--primary); font-weight: 800; }
.status-card strong { display: block; margin-top: 4px; }
.status-card p { margin: 6px 0 0; color: var(--muted); font-size: 14px; }

.capability-grid, .scenario-grid, .faq-grid, .content-grid { display: grid; gap: 16px; }
.card { padding: 22px; }
.card h3, .category-card h3, .scenario-card h3, .doc-card h3, .faq-item h3 { margin: 0 0 10px; font-size: 19px; }
.card p, .category-card p, .scenario-card p, .doc-card p, .faq-item p { margin: 0; color: var(--muted); }
.card .link, .category-card .link, .scenario-card .link, .doc-card .link { display: inline-flex; margin-top: 14px; color: var(--primary); font-weight: 800; }

.roadmap {
    position: relative;
    display: grid;
    gap: 16px;
    counter-reset: steps;
}
.roadmap:before {
    content: "";
    position: absolute;
    left: 22px;
    top: 16px;
    bottom: 16px;
    width: 2px;
    background: linear-gradient(180deg, rgba(70,139,223,0.5), rgba(70,139,223,0.08));
}
.road-step {
    position: relative;
    display: grid;
    grid-template-columns: 46px 1fr;
    gap: 14px;
    align-items: start;
}
.step-num {
    width: 46px;
    height: 46px;
    border-radius: 16px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--primary);
    color: #fff;
    font-weight: 900;
    box-shadow: 0 12px 24px rgba(70,139,223,0.23);
    z-index: 1;
}
.step-card { padding: 18px; }
.step-card h3 { margin: 0 0 6px; }
.step-card p { margin: 0; color: var(--muted); }
.step-card a { margin-top: 10px; display: inline-flex; color: var(--primary); font-weight: 800; }

.category-bento, .bento-grid { display: grid; gap: 16px; }
.category-card { padding: 22px; min-height: 150px; }
.category-card.featured { background: linear-gradient(145deg, #ffffff, #edf6ff); }
.bento-card {
    padding: 24px;
    border: 1px solid var(--line);
    border-radius: 26px;
    background: #fff;
    box-shadow: var(--shadow-soft);
    min-height: 170px;
}
.bento-card.large { background: linear-gradient(145deg, #ffffff 0%, #f0f7ff 100%); }
.bento-card h3 { margin: 0 0 12px; font-size: 22px; }
.bento-card p { margin: 0; color: var(--muted); }
.bento-meta { margin-top: 18px; display: flex; flex-wrap: wrap; gap: 8px; }

.security-layout { display: grid; gap: 20px; align-items: center; }
.principle-list { display: grid; gap: 12px; }
.principle-card { padding: 18px; display: flex; gap: 12px; align-items: flex-start; }
.principle-card span { width: 28px; height: 28px; border-radius: 10px; display: inline-flex; align-items: center; justify-content: center; background: var(--soft-2); color: var(--primary); font-weight: 900; flex: 0 0 auto; }
.principle-card p { margin: 0; color: var(--muted); }

.scenario-card { padding: 20px; }
.faq-item { padding: 20px; }
.faq-item details { margin: 0; }
.faq-item summary { cursor: pointer; font-weight: 800; color: var(--ink); }
.faq-item p { margin-top: 10px; }
.cta-section {
    margin: 16px auto 0;
    max-width: 960px;
    padding: 36px 22px;
    border: 1px solid rgba(70,139,223,0.15);
    border-radius: 28px;
    background: linear-gradient(135deg, #ffffff 0%, #edf6ff 100%);
    text-align: center;
    box-shadow: var(--shadow);
}
.cta-section p { color: var(--muted); max-width: 680px; margin: 0 auto 22px; }

.page-hero { padding: 62px 18px 28px; }
.page-hero .narrow { text-align: left; }
.page-hero h1 { margin: 16px 0 12px; font-size: clamp(34px, 6vw, 58px); line-height: 1.08; letter-spacing: -0.055em; }
.page-hero p { margin: 0; color: var(--muted); font-size: 17px; }
.doc-layout { display: grid; gap: 22px; align-items: start; }
.article-body { max-width: 780px; }
.article-body p { color: #52647c; margin: 0 0 18px; }
.doc-panel { display: grid; gap: 14px; }
.doc-card { padding: 20px; }
.check-list, .number-list { margin: 12px 0 0; padding-left: 20px; color: #52647c; }
.check-list li, .number-list li { margin: 8px 0; }
.alert-box {
    padding: 18px;
    border-radius: 20px;
    border: 1px solid rgba(70,139,223,0.22);
    background: rgba(70,139,223,0.08);
    color: #3d5674;
}
.doc-cta { margin-top: 22px; }

.download-flow { display: grid; gap: 14px; margin-top: 24px; }
.flow-item { padding: 18px; border-radius: 20px; background: #fff; border: 1px solid var(--line); display: grid; grid-template-columns: 40px 1fr; gap: 14px; align-items: start; }
.flow-item b { width: 40px; height: 40px; border-radius: 14px; background: var(--primary); color: #fff; display: inline-flex; align-items: center; justify-content: center; }

.site-footer { padding: 48px 18px 24px; background: #f4f8fe; border-top: 1px solid var(--line); }
.footer-grid { max-width: 1180px; margin: 0 auto; display: grid; gap: 24px; }
.footer-grid p { color: var(--muted); margin: 12px 0 0; }
.footer-grid h3 { margin: 0 0 10px; font-size: 15px; }
.footer-grid a { display: block; color: #52647c; margin: 7px 0; font-size: 14px; }
.footer-bottom { max-width: 1180px; margin: 28px auto 0; padding-top: 18px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }

@media (min-width: 720px) {
    .section { padding: 72px 24px; }
    .centered-hero { padding-top: 104px; }
    .capability-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .category-bento { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .scenario-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .faq-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .content-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .footer-grid { grid-template-columns: 1.5fr repeat(3, 1fr); }
}

@media (min-width: 960px) {
    .nav-toggle { display: none; }
    .site-nav {
        position: static;
        display: flex;
        flex-direction: row;
        align-items: center;
        gap: 4px;
        padding: 0;
        border: 0;
        background: transparent;
        box-shadow: none;
    }
    .site-nav a { padding: 8px 12px; }
    .product-bento { grid-template-columns: minmax(0, 1.3fr) minmax(280px, .7fr); align-items: stretch; }
    .product-main { min-height: 520px; display: flex; flex-direction: column; justify-content: center; }
    .status-grid { grid-template-rows: repeat(4, 1fr); }
    .capability-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .category-bento { grid-template-columns: repeat(4, minmax(0, 1fr)); grid-auto-rows: minmax(150px, auto); }
    .category-card.featured { grid-column: span 2; grid-row: span 2; }
    .bento-grid { grid-template-columns: repeat(6, minmax(0, 1fr)); }
    .bento-card.large { grid-column: span 3; min-height: 260px; }
    .bento-card.medium { grid-column: span 2; }
    .bento-card.small { grid-column: span 1; }
    .security-layout { grid-template-columns: 1fr 1fr; gap: 40px; }
    .roadmap { grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 12px; }
    .roadmap:before { left: 7%; right: 7%; top: 23px; bottom: auto; width: auto; height: 2px; }
    .road-step { grid-template-columns: 1fr; gap: 12px; }
    .step-num { margin: 0 auto; }
    .road-step:nth-child(even) .step-card { margin-top: 36px; }
    .doc-layout { grid-template-columns: minmax(0, 1fr) 340px; gap: 36px; }
    .page-hero { padding-top: 86px; }
}

@media (min-width: 1180px) {
    .section { padding-left: 0; padding-right: 0; }
}