* {
    box-sizing: border-box;
}

:root {
    --primary: rgb(70,139,223);
    --primary-dark: #245fba;
    --primary-soft: #eef6ff;
    --primary-line: #d7e9ff;
    --ink: #172033;
    --muted: #5d6b80;
    --soft: #f7faff;
    --panel: #ffffff;
    --line: #e5edf7;
    --warning: #fff8eb;
    --warning-line: #ffd89b;
    --radius: 18px;
    --shadow: 0 16px 42px rgba(28, 78, 140, 0.09);
}

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", "Microsoft YaHei", Arial, sans-serif;
    line-height: 1.72;
    background: linear-gradient(180deg, #f7fbff 0%, #ffffff 38%, #f5f9ff 100%);
}

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: 20;
    background: rgba(255, 255, 255, 0.92);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(14px);
}

.header-inner {
    width: min(1160px, calc(100% - 32px));
    margin: 0 auto;
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}

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

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

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

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

.site-nav.is-open {
    display: grid;
    gap: 4px;
}

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

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

.section,
.docs-hero,
.docs-layout,
.page-shell,
.cta-section,
.safety-strip,
.footer-inner {
    width: min(1160px, calc(100% - 32px));
    margin-left: auto;
    margin-right: auto;
}

.docs-hero {
    padding: 34px 0 20px;
    display: grid;
    gap: 24px;
}

.hero-copy {
    padding: 8px 0;
}

.eyebrow,
.doc-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary-dark);
    background: var(--primary-soft);
    border: 1px solid var(--primary-line);
    border-radius: 999px;
    padding: 6px 12px;
    font-size: 0.86rem;
    font-weight: 800;
}

h1,
h2,
h3 {
    line-height: 1.28;
    color: var(--ink);
    margin-top: 0;
}

h1 {
    font-size: clamp(2rem, 7vw, 4.3rem);
    letter-spacing: -0.04em;
    margin: 14px 0 18px;
}

h2 {
    font-size: clamp(1.45rem, 4.5vw, 2.2rem);
    letter-spacing: -0.025em;
    margin-bottom: 14px;
}

h3 {
    font-size: 1.08rem;
    margin-bottom: 8px;
}

.lead,
.page-summary {
    color: var(--muted);
    font-size: 1.05rem;
    margin: 0 0 22px;
}

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

.hero-tags span,
.tag-row span {
    display: inline-flex;
    border: 1px solid var(--primary-line);
    background: rgba(255, 255, 255, 0.84);
    color: #31516f;
    padding: 7px 11px;
    border-radius: 999px;
    font-size: 0.9rem;
    font-weight: 700;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 12px 24px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 12px 24px rgba(70, 139, 223, 0.22);
    transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.download-btn:hover {
    color: #fff;
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 16px 32px rgba(70, 139, 223, 0.28);
}

.hero-device {
    background: linear-gradient(145deg, rgba(236, 246, 255, 0.8), #fff);
    border: 1px solid var(--primary-line);
    border-radius: 28px;
    padding: 18px;
    box-shadow: var(--shadow);
}

.app-frame {
    display: grid;
    gap: 14px;
}

.app-frame img {
    margin: 0 auto;
    width: min(330px, 82%);
    border-radius: 30px;
    filter: drop-shadow(0 22px 40px rgba(31, 76, 128, 0.18));
}

.security-stack {
    display: grid;
    gap: 10px;
}

.security-mini-card,
.notice-box,
.info-panel,
.doc-panel,
.category-card,
.step-card,
.risk-item,
.faq-item,
.content-card,
.checklist,
.side-panel {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
}

.security-mini-card {
    padding: 14px;
}

.security-mini-card strong,
.risk-item strong,
.faq-item strong {
    display: block;
    margin-bottom: 4px;
    color: var(--ink);
}

.security-mini-card p,
.risk-item p,
.faq-item p,
.content-card p,
.doc-panel p,
.step-card p,
.side-panel p,
.category-card p {
    margin: 0;
    color: var(--muted);
}

.safety-strip {
    margin-top: 18px;
    margin-bottom: 28px;
    padding: 14px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
    background: var(--primary-soft);
    border: 1px solid var(--primary-line);
    border-radius: 18px;
}

.safety-strip span {
    flex: 1 1 240px;
    padding: 8px 10px;
    color: #31516f;
    font-weight: 700;
}

.docs-layout {
    display: grid;
    gap: 22px;
    padding: 10px 0 54px;
}

.docs-sidebar {
    background: rgba(255, 255, 255, 0.92);
    border: 1px solid var(--line);
    border-radius: 22px;
    padding: 14px;
    box-shadow: var(--shadow);
}

.docs-sidebar-title {
    margin: 0 0 10px;
    color: var(--ink);
    font-weight: 900;
}

.docs-sidebar nav {
    display: grid;
    grid-template-columns: 1fr;
    gap: 6px;
}

.docs-sidebar a {
    padding: 10px 12px;
    border-radius: 12px;
    color: var(--muted);
    font-weight: 700;
}

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

.docs-content {
    display: grid;
    gap: 26px;
    min-width: 0;
}

.doc-section {
    scroll-margin-top: 92px;
}

.doc-panel {
    padding: 22px;
    box-shadow: 0 10px 30px rgba(27, 79, 142, 0.06);
}

.section-titleline {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 14px;
}

.section-num,
.step-num,
.principle-num {
    flex: 0 0 auto;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
    border-radius: 12px;
    color: #fff;
    background: var(--primary);
    font-weight: 900;
}

.docs-steps {
    display: grid;
    gap: 12px;
}

.step-card {
    padding: 16px;
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 12px;
    align-items: start;
}

.step-card a,
.category-card a,
.risk-item a,
.doc-panel a.inline-link,
.content-card a {
    display: inline-flex;
    margin-top: 10px;
    font-weight: 800;
}

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

.category-card,
.content-card,
.risk-item {
    padding: 18px;
}

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

.principle-item {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 12px;
    padding: 16px;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: #fff;
}

.notice-box {
    padding: 16px;
    background: var(--primary-soft);
    border-left: 5px solid var(--primary);
}

.notice-box.warning {
    background: var(--warning);
    border-left-color: var(--warning-line);
}

.notice-box strong {
    display: block;
    margin-bottom: 6px;
}

.cta-section {
    margin-top: 14px;
    margin-bottom: 56px;
    text-align: center;
    padding: 28px 18px;
    border: 1px solid var(--primary-line);
    border-radius: 26px;
    background: linear-gradient(135deg, #eef6ff, #ffffff 58%, #f4f9ff);
}

.cta-section p {
    color: var(--muted);
    max-width: 680px;
    margin: 0 auto 18px;
}

.page-shell {
    padding: 34px 0 58px;
}

.page-header {
    max-width: 820px;
    margin-bottom: 22px;
}

.page-header h1 {
    font-size: clamp(2rem, 6vw, 3.1rem);
}

.article-layout {
    display: grid;
    gap: 20px;
}

.article-main {
    display: grid;
    gap: 18px;
    min-width: 0;
}

.reading-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 24px;
    padding: 22px;
    box-shadow: var(--shadow);
}

.reading-card p {
    color: var(--muted);
}

.checklist {
    padding: 18px;
    background: #fbfdff;
}

.checklist ul,
.checklist ol {
    margin: 10px 0 0;
    padding-left: 20px;
    color: var(--muted);
}

.side-panel {
    padding: 18px;
    align-self: start;
}

.side-panel ul {
    margin: 10px 0 0;
    padding-left: 18px;
    color: var(--muted);
}

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

.faq-item {
    padding: 18px;
}

.table-like {
    display: grid;
    gap: 10px;
}

.table-row {
    display: grid;
    gap: 8px;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 16px;
    background: #fff;
}

.table-row span:first-child {
    font-weight: 900;
    color: var(--primary-dark);
}

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

.footer-inner {
    padding: 30px 0;
    display: grid;
    gap: 18px;
    color: var(--muted);
}

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

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 18px;
}

.footer-links a {
    font-weight: 700;
}

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

    .table-row {
        grid-template-columns: 160px 1fr;
    }
}

@media (min-width: 880px) {
    .nav-toggle {
        display: none;
    }

    .site-nav {
        display: flex;
        position: static;
        padding: 0;
        border: 0;
        box-shadow: none;
        background: transparent;
        align-items: center;
        gap: 2px;
    }

    .site-nav a {
        padding: 8px 11px;
    }

    .docs-hero {
        grid-template-columns: minmax(0, 1.04fr) minmax(350px, 0.96fr);
        gap: 36px;
        align-items: center;
        padding-top: 54px;
    }

    .app-frame {
        grid-template-columns: 0.92fr 1fr;
        align-items: center;
    }

    .docs-layout {
        grid-template-columns: 260px minmax(0, 1fr);
        align-items: start;
    }

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

    .docs-sidebar nav {
        grid-template-columns: 1fr;
    }

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

    .article-layout {
        grid-template-columns: minmax(0, 760px) 300px;
        align-items: start;
    }

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

@media (min-width: 1100px) {
    .site-nav a {
        padding: 9px 14px;
    }

    .doc-panel,
    .reading-card {
        padding: 28px;
    }
}