:root {
    --primary: rgb(70,139,223);
    --primary-dark: #1f5fa8;
    --ink: #102033;
    --muted: #607188;
    --line: #dce9f7;
    --soft: #f5f9ff;
    --soft-blue: #eaf4ff;
    --card: rgba(255,255,255,0.86);
    --shadow: 0 18px 48px rgba(20, 76, 132, 0.10);
    --radius: 24px;
    --max: 1160px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    min-width: 320px;
    overflow-x: hidden;
    color: var(--ink);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
    line-height: 1.75;
    background:
        radial-gradient(circle at 8% 0%, rgba(70,139,223,0.12), transparent 30%),
        linear-gradient(180deg, #ffffff 0%, #f7fbff 44%, #ffffff 100%);
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
p { margin: 0 0 16px; color: var(--muted); }
h1, h2, h3 { margin: 0; color: var(--ink); line-height: 1.16; letter-spacing: -0.03em; }
h1 { font-size: clamp(2.4rem, 9vw, 5.8rem); }
h2 { font-size: clamp(1.8rem, 5vw, 3.3rem); }
h3 { font-size: 1.18rem; }

.container { width: min(100% - 32px, var(--max)); margin: 0 auto; }
.section { padding: 58px 0; }
.section-head { margin-bottom: 26px; max-width: 780px; }
.section-kicker, .eyebrow, .doc-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 14px;
    padding: 7px 12px;
    border: 1px solid var(--line);
    border-radius: 999px;
    color: var(--primary-dark);
    font-size: 0.82rem;
    font-weight: 700;
    background: rgba(255,255,255,0.76);
}
.muted { color: var(--muted); }

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    border-bottom: 1px solid rgba(220,233,247,0.76);
    background: rgba(255,255,255,0.86);
    backdrop-filter: blur(18px);
}
.header-inner {
    width: min(100% - 28px, var(--max));
    min-height: 68px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: -0.02em; }
.logo-img { width: 36px; height: 36px; border-radius: 12px; }
.brand-text { white-space: nowrap; }
.nav-toggle {
    width: 42px;
    height: 42px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: #fff;
    color: var(--ink);
    font-size: 20px;
}
.site-nav {
    position: absolute;
    left: 14px;
    right: 14px;
    top: 72px;
    display: none;
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: rgba(255,255,255,0.96);
    box-shadow: var(--shadow);
}
.site-nav.is-open { display: grid; }
.site-nav a {
    padding: 12px 14px;
    border-radius: 12px;
    color: #30455f;
    font-weight: 650;
}
.site-nav a:hover { background: var(--soft-blue); color: var(--primary-dark); }

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 24px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    letter-spacing: 0.02em;
    box-shadow: 0 14px 28px rgba(70,139,223,0.25);
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.download-btn:hover { transform: translateY(-2px); background: var(--primary-dark); box-shadow: 0 18px 36px rgba(70,139,223,0.32); }

.centered-hero {
    padding: 76px 0 36px;
    text-align: center;
}
.hero-copy { width: min(920px, 100%); margin: 0 auto; }
.hero-copy p { max-width: 760px; margin: 22px auto; font-size: 1.06rem; }
.hero-tags, .tag-row { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin-top: 20px; }
.hero-tags span, .tag-row span, .soft-tag {
    display: inline-flex;
    padding: 8px 12px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: rgba(255,255,255,0.82);
    color: #35536d;
    font-size: .88rem;
    font-weight: 650;
}

.product-bento {
    display: grid;
    gap: 16px;
    margin-top: 38px;
}
.product-main-card {
    position: relative;
    min-height: 420px;
    padding: 28px;
    border: 1px solid rgba(220,233,247,.9);
    border-radius: 32px;
    overflow: hidden;
    background: linear-gradient(145deg, #f2f8ff, #fff 52%, #eaf4ff);
    box-shadow: var(--shadow);
}
.product-main-card::before {
    content: "";
    position: absolute;
    inset: 24px;
    border: 1px solid rgba(70,139,223,0.12);
    border-radius: 28px;
    pointer-events: none;
}
.app-visual { width: min(290px, 78%); margin: 26px auto 0; filter: drop-shadow(0 24px 36px rgba(20,76,132,.18)); }
.floating-card, .status-card {
    padding: 18px;
    border: 1px solid rgba(220,233,247,.92);
    border-radius: 22px;
    background: rgba(255,255,255,.88);
    box-shadow: 0 12px 32px rgba(20,76,132,.08);
}
.floating-card strong, .status-card strong { display: block; margin-bottom: 6px; color: var(--ink); }
.floating-card span, .status-card span { display: block; color: var(--muted); font-size: .92rem; line-height: 1.55; }
.product-status { display: grid; gap: 14px; }

.ability-grid {
    display: grid;
    gap: 14px;
}
.ability-card, .category-card, .scenario-card, .faq-item, .doc-card, .step-card, .principle-card {
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--card);
    box-shadow: 0 10px 30px rgba(20,76,132,.06);
}
.ability-card { padding: 22px; }
.ability-card .num { display: block; margin-bottom: 30px; color: var(--primary); font-weight: 900; }

.roadmap {
    position: relative;
    display: grid;
    gap: 14px;
}
.roadmap-step {
    position: relative;
    padding: 22px;
    border: 1px solid var(--line);
    border-radius: 22px;
    background: #fff;
}
.roadmap-step .step-no {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    margin-bottom: 14px;
    border-radius: 14px;
    color: #fff;
    background: var(--primary);
    font-weight: 900;
}
.inline-link { color: var(--primary-dark); font-weight: 800; border-bottom: 1px solid rgba(70,139,223,.32); }

.category-bento, .bento-grid, .scenario-grid {
    display: grid;
    gap: 15px;
}
.category-card { padding: 22px; min-height: 160px; }
.category-card .category-label { color: var(--primary); font-size: .86rem; font-weight: 900; }
.category-card h3 { margin: 12px 0 10px; }
.category-card a, .scenario-card a, .doc-card a { color: var(--primary-dark); font-weight: 800; }

.bento-card {
    min-height: 190px;
    padding: 24px;
    border: 1px solid var(--line);
    border-radius: 28px;
    background: #fff;
    box-shadow: var(--shadow);
}
.bento-card.large { background: linear-gradient(150deg, #ffffff, #edf6ff); }
.bento-card.small { min-height: 150px; }
.bento-card .pill {
    display: inline-block;
    margin-bottom: 18px;
    padding: 6px 10px;
    border-radius: 999px;
    background: var(--soft-blue);
    color: var(--primary-dark);
    font-size: .78rem;
    font-weight: 850;
}

.security-layout {
    display: grid;
    gap: 24px;
    align-items: start;
}
.security-panel {
    padding: 24px;
    border-radius: 30px;
    background: linear-gradient(155deg, rgba(70,139,223,.12), rgba(255,255,255,.92));
    border: 1px solid var(--line);
}
.principle-list { display: grid; gap: 12px; margin-top: 18px; }
.principle-card { padding: 16px; }

.scenario-card { padding: 22px; }
.scenario-card strong { display: block; margin-bottom: 8px; font-size: 1.05rem; }

.faq-list { display: grid; gap: 12px; }
.faq-item { padding: 20px; }
.faq-item h3 { margin-bottom: 8px; }

.cta-section {
    padding: 64px 0 84px;
}
.cta-card {
    text-align: center;
    padding: 36px 22px;
    border: 1px solid var(--line);
    border-radius: 32px;
    background: linear-gradient(145deg, #eff7ff, #fff);
    box-shadow: var(--shadow);
}
.cta-card p { max-width: 640px; margin: 16px auto 24px; }

.page-hero {
    padding: 54px 0 22px;
}
.page-hero .doc-badge { margin-bottom: 16px; }
.page-hero p { max-width: 760px; font-size: 1.03rem; }
.doc-layout {
    display: grid;
    gap: 20px;
    align-items: start;
    padding-bottom: 70px;
}
.doc-main {
    padding: 24px;
    border: 1px solid var(--line);
    border-radius: 28px;
    background: rgba(255,255,255,.88);
    box-shadow: 0 12px 36px rgba(20,76,132,.06);
}
.doc-main h2 { margin: 26px 0 12px; font-size: clamp(1.35rem, 4vw, 2rem); }
.doc-main ul, .doc-main ol { padding-left: 20px; color: var(--muted); }
.doc-main li { margin: 8px 0; }
.doc-aside { display: grid; gap: 14px; }
.doc-card { padding: 20px; }
.process-steps { display: grid; gap: 12px; margin: 18px 0; }
.step-card { padding: 18px; }
.step-card b { color: var(--primary-dark); }
.notice-box {
    padding: 18px;
    border-radius: 22px;
    background: var(--soft-blue);
    color: #35536d;
    border: 1px solid var(--line);
}
.download-row { margin-top: 24px; }

.download-steps {
    counter-reset: item;
    display: grid;
    gap: 12px;
    margin-top: 24px;
}
.download-step {
    display: grid;
    grid-template-columns: 44px 1fr;
    gap: 12px;
    padding: 18px;
    border: 1px solid var(--line);
    border-radius: 22px;
    background: #fff;
}
.download-step::before {
    counter-increment: item;
    content: counter(item);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 14px;
    background: var(--primary);
    color: #fff;
    font-weight: 900;
}

.site-footer {
    border-top: 1px solid var(--line);
    background: #f7fbff;
    padding-top: 42px;
}
.footer-grid { display: grid; gap: 24px; }
.footer-brand { margin-bottom: 10px; font-weight: 900; font-size: 1.2rem; }
.site-footer h3 { margin-bottom: 10px; font-size: 1rem; }
.site-footer a { display: block; margin: 8px 0; color: var(--muted); }
.footer-bottom {
    width: min(100% - 32px, var(--max));
    margin: 28px auto 0;
    padding: 18px 0 24px;
    border-top: 1px solid var(--line);
    color: var(--muted);
    font-size: .9rem;
}

@media (min-width: 700px) {
    .container { width: min(100% - 48px, var(--max)); }
    .ability-grid { grid-template-columns: repeat(2, 1fr); }
    .category-bento, .scenario-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1.5fr 1fr 1fr; }
    .doc-main { padding: 34px; }
}

@media (min-width: 980px) {
    .section { padding: 76px 0; }
    .nav-toggle { display: none; }
    .site-nav {
        position: static;
        display: flex;
        align-items: center;
        gap: 4px;
        padding: 0;
        border: 0;
        box-shadow: none;
        background: transparent;
    }
    .site-nav a { padding: 9px 12px; font-size: .94rem; }
    .centered-hero { padding-top: 104px; }
    .product-bento { grid-template-columns: minmax(0, 1.45fr) minmax(280px, .75fr); align-items: stretch; }
    .product-status { grid-template-rows: repeat(4, 1fr); }
    .floating-card { position: absolute; max-width: 230px; }
    .floating-card.one { left: 42px; top: 58px; }
    .floating-card.two { right: 52px; top: 74px; }
    .floating-card.three { left: 70px; bottom: 52px; }
    .app-visual { margin-top: 44px; }
    .ability-grid { grid-template-columns: repeat(4, 1fr); }
    .roadmap { grid-template-columns: repeat(6, 1fr); gap: 12px; }
    .roadmap-step:nth-child(even) { margin-top: 44px; }
    .category-bento { grid-template-columns: repeat(4, 1fr); grid-auto-rows: 170px; }
    .category-card { min-height: auto; }
    .category-card.big { grid-column: span 2; grid-row: span 2; padding: 30px; }
    .bento-grid { grid-template-columns: repeat(4, 1fr); grid-auto-rows: minmax(170px, auto); }
    .bento-card.large { grid-column: span 2; grid-row: span 2; }
    .bento-card.medium { grid-column: span 2; }
    .security-layout { grid-template-columns: .95fr 1.05fr; gap: 34px; }
    .scenario-grid { grid-template-columns: repeat(5, 1fr); }
    .scenario-card.wide { grid-column: span 2; }
    .doc-layout { grid-template-columns: minmax(0, 760px) 320px; gap: 28px; }
    .doc-aside { position: sticky; top: 96px; }
}