:root {
    --primary: rgb(70,139,223);
    --primary-dark: rgb(38,94,168);
    --primary-soft: rgb(232,243,255);
    --ink: #102033;
    --muted: #64748b;
    --line: #dbe7f5;
    --panel: #ffffff;
    --bg: #f6faff;
    --deep: #19324d;
    --shadow: 0 14px 36px rgba(25, 64, 110, 0.08);
    --radius: 18px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
    color: var(--ink);
    background: linear-gradient(180deg, #f7fbff 0%, #ffffff 38%, #f5f9ff 100%);
    line-height: 1.75;
    overflow-x: hidden;
}

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

a:hover {
    color: var(--primary);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,0.94);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--line);
}

.header-inner {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--ink);
    font-weight: 800;
    letter-spacing: 0.02em;
}

.brand-logo {
    width: 38px;
    height: 38px;
    border-radius: 12px;
}

.brand-text {
    font-size: 18px;
}

.nav-toggle {
    border: 1px solid var(--line);
    background: #fff;
    color: var(--deep);
    border-radius: 999px;
    padding: 8px 14px;
    font-weight: 700;
}

.site-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 72px;
    display: none;
    flex-direction: column;
    gap: 6px;
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: #fff;
    box-shadow: var(--shadow);
}

.site-nav.open {
    display: flex;
}

.site-nav a {
    color: var(--deep);
    font-weight: 700;
    padding: 10px 12px;
    border-radius: 12px;
}

.site-nav a.active,
.site-nav a:hover {
    background: var(--primary-soft);
    color: var(--primary-dark);
}

.container,
.docs-hero,
.safety-strip,
.docs-layout,
.cta-section,
.page-wrap,
.download-wrap,
.about-wrap,
.faq-wrap {
    width: min(1180px, calc(100% - 32px));
    margin-left: auto;
    margin-right: auto;
}

section {
    margin: 28px 0;
}

.docs-hero {
    display: grid;
    gap: 26px;
    padding: 42px 0 24px;
}

.hero-copy {
    padding: 24px 0;
}

.kicker,
.doc-badge {
    display: inline-flex;
    align-items: center;
    width: fit-content;
    gap: 8px;
    padding: 6px 12px;
    border-radius: 999px;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-size: 13px;
    font-weight: 800;
    letter-spacing: 0.04em;
}

h1,
h2,
h3 {
    color: var(--ink);
    line-height: 1.25;
    margin: 0 0 14px;
}

h1 {
    font-size: clamp(32px, 8vw, 56px);
    letter-spacing: -0.04em;
}

h2 {
    font-size: clamp(24px, 4vw, 34px);
    letter-spacing: -0.02em;
}

h3 {
    font-size: 19px;
}

p {
    margin: 0 0 14px;
    color: #425466;
}

.hero-lead {
    font-size: 17px;
    color: #41566f;
    max-width: 680px;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 46px;
    padding: 12px 24px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    border: 1px solid var(--primary);
    box-shadow: 0 10px 24px rgba(70,139,223,0.22);
    transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}

.download-btn:hover {
    color: #fff;
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 14px 28px rgba(70,139,223,0.28);
}

.hero-tags,
.inline-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 18px;
}

.hero-tags span,
.inline-tags span {
    border: 1px solid var(--line);
    background: #fff;
    color: var(--deep);
    padding: 8px 12px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 700;
}

.hero-visual {
    position: relative;
    padding: 18px;
    border-radius: 28px;
    background: linear-gradient(145deg, #f2f8ff 0%, #ffffff 58%, #eaf4ff 100%);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}

.app-frame {
    margin: 0 auto;
    max-width: 360px;
    border-radius: 28px;
    overflow: hidden;
}

.status-cards {
    display: grid;
    gap: 12px;
    margin-top: 16px;
}

.status-card,
.security-panel,
.doc-card,
.category-card,
.risk-item,
.faq-item,
.step-item,
.principle-item,
.feature-card,
.notice-box,
.aside-card,
.check-card {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 18px;
    box-shadow: 0 8px 20px rgba(20, 68, 120, 0.04);
}

.status-card strong {
    display: block;
    color: var(--deep);
    margin-bottom: 4px;
}

.safety-strip {
    display: grid;
    gap: 10px;
    padding: 16px;
    border-radius: 20px;
    background: linear-gradient(90deg, #edf7ff, #f8fbff);
    border: 1px solid var(--line);
}

.safety-strip span {
    color: #27445f;
    font-weight: 700;
}

.docs-layout {
    display: grid;
    gap: 24px;
    align-items: start;
    margin-top: 30px;
}

.docs-sidebar {
    display: grid;
    gap: 8px;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: rgba(255,255,255,0.92);
}

.docs-sidebar-title {
    color: var(--muted);
    font-size: 13px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: .08em;
    padding: 0 8px 6px;
}

.docs-sidebar a {
    display: block;
    padding: 10px 12px;
    color: var(--deep);
    border-radius: 12px;
    font-weight: 700;
    background: #f8fbff;
}

.docs-sidebar a:hover {
    background: var(--primary-soft);
}

.docs-content {
    min-width: 0;
}

.module {
    padding: 24px;
    margin-bottom: 22px;
    border: 1px solid var(--line);
    border-radius: 24px;
    background: rgba(255,255,255,0.94);
    box-shadow: var(--shadow);
}

.module-header {
    margin-bottom: 18px;
}

.module-label {
    display: block;
    color: var(--primary-dark);
    font-weight: 900;
    letter-spacing: .08em;
    font-size: 13px;
    margin-bottom: 6px;
}

.docs-steps {
    display: grid;
    gap: 14px;
}

.step-item {
    display: grid;
    gap: 8px;
}

.step-number {
    width: 34px;
    height: 34px;
    border-radius: 12px;
    display: inline-grid;
    place-items: center;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-weight: 900;
}

.step-link,
.text-link {
    display: inline-flex;
    font-weight: 800;
    margin-top: 4px;
}

.docs-category-grid,
.risk-grid,
.feature-grid,
.mini-grid,
.check-grid {
    display: grid;
    gap: 14px;
}

.category-card,
.doc-card {
    transition: transform .18s ease, border-color .18s ease;
}

.category-card:hover,
.doc-card:hover {
    transform: translateY(-2px);
    border-color: rgba(70,139,223,0.5);
}

.principle-list {
    display: grid;
    gap: 12px;
}

.principle-item {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 12px;
    align-items: start;
}

.principle-index {
    min-width: 38px;
    height: 38px;
    border-radius: 14px;
    display: grid;
    place-items: center;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-weight: 900;
}

.notice-box {
    background: #f1f8ff;
    border-left: 4px solid var(--primary);
    box-shadow: none;
}

.risk-item strong,
.feature-card strong,
.check-card strong {
    display: block;
    color: var(--deep);
    margin-bottom: 6px;
}

.faq-list {
    display: grid;
    gap: 14px;
}

.faq-item h3 {
    margin-bottom: 8px;
}

.cta-section {
    margin-top: 34px;
    margin-bottom: 42px;
    padding: 34px 24px;
    border-radius: 28px;
    text-align: center;
    background: linear-gradient(135deg, #eaf4ff 0%, #ffffff 100%);
    border: 1px solid var(--line);
}

.cta-section p {
    max-width: 720px;
    margin-left: auto;
    margin-right: auto;
}

.page-wrap,
.download-wrap,
.about-wrap,
.faq-wrap {
    padding: 34px 0 46px;
}

.doc-shell {
    display: grid;
    gap: 22px;
    align-items: start;
}

.doc-main {
    min-width: 0;
}

.doc-article {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 24px;
    padding: 24px;
    box-shadow: var(--shadow);
}

.doc-article .summary {
    color: #36516d;
    font-size: 17px;
    border-bottom: 1px solid var(--line);
    padding-bottom: 18px;
    margin-bottom: 18px;
}

.doc-section {
    margin: 24px 0;
}

.doc-section ul,
.doc-section ol {
    margin: 10px 0 0;
    padding-left: 22px;
    color: #425466;
}

.doc-section li {
    margin: 7px 0;
}

.doc-download {
    margin-top: 26px;
    padding-top: 22px;
    border-top: 1px solid var(--line);
}

.doc-aside {
    display: grid;
    gap: 14px;
}

.aside-card {
    background: #f8fbff;
}

.aside-card a {
    display: block;
    margin: 8px 0;
    font-weight: 800;
}

.download-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 26px;
    padding: 26px;
    box-shadow: var(--shadow);
}

.download-steps {
    counter-reset: dl;
    display: grid;
    gap: 14px;
    margin: 24px 0;
}

.download-steps div {
    position: relative;
    padding: 16px 16px 16px 58px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: #f8fbff;
}

.download-steps div::before {
    counter-increment: dl;
    content: counter(dl);
    position: absolute;
    left: 16px;
    top: 16px;
    width: 28px;
    height: 28px;
    display: grid;
    place-items: center;
    border-radius: 10px;
    background: var(--primary);
    color: #fff;
    font-weight: 900;
}

.faq-page-list {
    display: grid;
    gap: 16px;
}

.site-footer {
    border-top: 1px solid var(--line);
    background: #ffffff;
}

.footer-inner {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
    padding: 30px 0;
    display: grid;
    gap: 20px;
}

.footer-brand {
    color: var(--deep);
    font-weight: 900;
    margin-bottom: 8px;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 16px;
}

.footer-links a {
    font-weight: 800;
    color: var(--deep);
}

@media (min-width: 640px) {
    .docs-category-grid,
    .risk-grid,
    .feature-grid,
    .mini-grid,
    .check-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .safety-strip {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}

@media (min-width: 860px) {
    .nav-toggle {
        display: none;
    }

    .site-nav {
        position: static;
        display: flex;
        flex-direction: row;
        align-items: center;
        gap: 4px;
        padding: 0;
        border: 0;
        box-shadow: none;
        background: transparent;
    }

    .site-nav a {
        font-size: 14px;
    }

    .docs-layout {
        grid-template-columns: 240px minmax(0, 1fr);
    }

    .docs-sidebar {
        position: sticky;
        top: 92px;
    }

    .doc-shell {
        grid-template-columns: minmax(0, 760px) 300px;
        justify-content: center;
    }

    .footer-inner {
        grid-template-columns: 1fr auto;
        align-items: start;
    }
}

@media (min-width: 980px) {
    .docs-hero {
        grid-template-columns: minmax(0, 1.05fr) minmax(380px, .95fr);
        align-items: center;
        padding-top: 62px;
    }

    .status-cards {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .docs-category-grid,
    .risk-grid,
    .feature-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .step-item {
        grid-template-columns: auto 1fr;
        align-items: start;
    }

    .module {
        padding: 32px;
    }
}