:root {
    --primary: rgb(70,139,223);
    --primary-dark: #2266b8;
    --primary-soft: #eef6ff;
    --ink: #172235;
    --muted: #5d6b80;
    --line: #dbe8f7;
    --panel: #ffffff;
    --bg: #f7fbff;
    --blue-grey: #edf4fb;
    --success-soft: #f0f8ff;
    --radius-lg: 22px;
    --radius-md: 16px;
    --shadow: 0 16px 45px rgba(41, 89, 145, 0.08);
}

* {
    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);
    line-height: 1.72;
    background: linear-gradient(180deg, #f4f9ff 0%, #ffffff 38%, #f8fbff 100%);
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
}

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

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid rgba(219, 232, 247, 0.82);
}

.header-inner {
    width: min(1160px, calc(100% - 32px));
    margin: 0 auto;
    min-height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    color: #12345a;
    letter-spacing: 0.02em;
}

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

.brand-text {
    white-space: nowrap;
}

.nav-toggle {
    border: 1px solid var(--line);
    border-radius: 12px;
    background: #fff;
    width: 42px;
    height: 38px;
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
}

.nav-toggle span {
    width: 18px;
    height: 2px;
    border-radius: 2px;
    background: var(--primary);
}

.site-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 72px;
    display: none;
    flex-direction: column;
    gap: 4px;
    padding: 12px;
    border: 1px solid var(--line);
    background: #fff;
    border-radius: 18px;
    box-shadow: var(--shadow);
}

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

.site-nav a {
    padding: 11px 12px;
    border-radius: 12px;
    color: #33465f;
    font-size: 15px;
}

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

.page-wrap,
.container {
    width: min(1160px, calc(100% - 32px));
    margin: 0 auto;
}

.docs-hero {
    padding: 36px 0 22px;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
    align-items: center;
}

.eyebrow,
.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-weight: 700;
    font-size: 13px;
}

h1, h2, h3 {
    line-height: 1.28;
    margin: 0 0 12px;
    color: #14233a;
}

h1 {
    font-size: clamp(30px, 8vw, 54px);
    letter-spacing: -0.04em;
}

h2 {
    font-size: clamp(24px, 5vw, 34px);
    letter-spacing: -0.025em;
}

h3 {
    font-size: 19px;
}

.lead,
.page-summary {
    color: var(--muted);
    font-size: 17px;
    margin: 0 0 22px;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 24px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 12px 28px rgba(70, 139, 223, 0.22);
    transition: transform 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
    border: 0;
}

.download-btn:hover {
    transform: translateY(-1px);
    background: var(--primary-dark);
    box-shadow: 0 14px 34px rgba(70, 139, 223, 0.28);
}

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

.security-tags span {
    padding: 8px 12px;
    border-radius: 999px;
    color: #24405f;
    background: #fff;
    border: 1px solid var(--line);
    font-size: 13px;
}

.hero-visual {
    position: relative;
    border: 1px solid rgba(219, 232, 247, 0.9);
    border-radius: 28px;
    background: linear-gradient(145deg, #ffffff, #eef7ff);
    box-shadow: var(--shadow);
    padding: 20px;
    display: grid;
    gap: 14px;
}

.app-preview {
    width: min(310px, 76vw);
    margin: 0 auto;
}

.status-card,
.security-panel,
.tip-box,
.notice-box,
.aside-card {
    border: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.9);
    border-radius: var(--radius-md);
    padding: 16px;
}

.status-card strong,
.security-panel strong,
.tip-box strong,
.notice-box strong {
    display: block;
    color: #12345a;
    margin-bottom: 5px;
}

.status-list {
    display: grid;
    gap: 10px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.status-list li {
    display: flex;
    gap: 9px;
    color: var(--muted);
    font-size: 14px;
}

.status-list li::before {
    content: "";
    width: 8px;
    height: 8px;
    margin-top: 10px;
    border-radius: 50%;
    background: var(--primary);
    flex: 0 0 auto;
}

.safety-strip {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    padding: 14px;
    border: 1px solid #d7eaff;
    background: linear-gradient(90deg, #eef7ff, #f8fbff);
    border-radius: var(--radius-lg);
    margin: 8px auto 34px;
}

.safety-strip span {
    flex: 1 1 210px;
    color: #2d4a6d;
    font-size: 14px;
}

.docs-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    margin: 0 auto 42px;
}

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

.docs-sidebar strong {
    display: block;
    margin: 4px 8px 10px;
    color: #17365d;
}

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

.docs-sidebar a {
    padding: 10px 12px;
    border-radius: 12px;
    color: #445870;
    background: #f7fbff;
    border: 1px solid transparent;
}

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

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

.section {
    margin-bottom: 42px;
}

.section-head {
    margin-bottom: 18px;
}

.section-kicker {
    color: var(--primary-dark);
    font-weight: 800;
    font-size: 13px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.card-grid,
.docs-category-grid,
.feature-grid,
.risk-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 14px;
}

.doc-card,
.category-card,
.feature-card,
.risk-item,
.faq-item,
.step-item,
.principle-item {
    border: 1px solid var(--line);
    background: #fff;
    border-radius: var(--radius-md);
    padding: 18px;
    box-shadow: 0 10px 28px rgba(41, 89, 145, 0.055);
}

.category-card a,
.doc-link,
.risk-item a,
.step-link,
.faq-more,
.inline-link {
    color: var(--primary-dark);
    font-weight: 800;
}

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

.step-item {
    display: grid;
    grid-template-columns: 42px 1fr;
    gap: 12px;
    align-items: start;
}

.step-number {
    width: 42px;
    height: 42px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 14px;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-weight: 900;
}

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

.principle-item {
    display: grid;
    grid-template-columns: 48px 1fr;
    gap: 12px;
}

.principle-item span {
    color: var(--primary-dark);
    font-size: 24px;
    font-weight: 900;
}

.tip-box,
.notice-box {
    background: var(--primary-soft);
    border-left: 4px solid var(--primary);
}

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

.risk-name {
    font-weight: 900;
    color: #17365d;
}

.cta-section {
    text-align: center;
    padding: 34px 20px;
    margin: 36px 0 52px;
    border: 1px solid #d7eaff;
    border-radius: 28px;
    background: linear-gradient(135deg, #eef7ff, #ffffff 52%, #f5faff);
}

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

.doc-title-area {
    padding: 34px 0 16px;
    max-width: 860px;
}

.article-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    align-items: start;
    margin-bottom: 52px;
}

.article-body {
    border: 1px solid var(--line);
    border-radius: 26px;
    background: #fff;
    padding: 22px;
    box-shadow: var(--shadow);
}

.article-body p {
    color: #445870;
}

.article-body ul,
.article-body ol {
    padding-left: 22px;
    color: #445870;
}

.article-body li + li {
    margin-top: 6px;
}

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

.aside-card {
    background: #f9fcff;
}

.check-list {
    display: grid;
    gap: 10px;
    padding: 0;
    margin: 16px 0;
    list-style: none;
}

.check-list li {
    padding: 11px 12px 11px 34px;
    position: relative;
    background: #f7fbff;
    border: 1px solid var(--line);
    border-radius: 12px;
}

.check-list li::before {
    content: "";
    position: absolute;
    left: 13px;
    top: 18px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--primary);
}

.download-inline {
    margin-top: 24px;
    padding-top: 18px;
    border-top: 1px solid var(--line);
}

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

.faq-item h2,
.faq-item h3 {
    font-size: 18px;
    margin-bottom: 8px;
}

.download-flow {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
    margin: 22px 0;
}

.flow-card {
    padding: 16px;
    border-radius: 16px;
    background: #fff;
    border: 1px solid var(--line);
}

.flow-card span {
    color: var(--primary-dark);
    font-weight: 900;
}

.site-footer {
    background: #10233a;
    color: #d7e6f8;
    padding-top: 34px;
}

.footer-inner {
    width: min(1160px, calc(100% - 32px));
    margin: 0 auto;
    display: grid;
    gap: 20px;
}

.footer-inner p {
    color: #b7c8dc;
    margin: 8px 0 0;
}

.footer-links {
    display: grid;
    gap: 8px;
}

.footer-links a {
    color: #e7f1ff;
}

.footer-bottom {
    width: min(1160px, calc(100% - 32px));
    margin: 26px auto 0;
    border-top: 1px solid rgba(255,255,255,0.14);
    padding: 18px 0;
    color: #aabbd0;
    font-size: 13px;
}

@media (min-width: 680px) {
    .docs-category-grid,
    .feature-grid,
    .risk-grid,
    .card-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
    .download-flow {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
    .footer-inner {
        grid-template-columns: 1.4fr 1fr;
    }
}

@media (min-width: 920px) {
    .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 {
        padding: 8px 12px;
    }
    .docs-hero {
        padding: 70px 0 28px;
    }
    .hero-grid {
        grid-template-columns: minmax(0, 1.06fr) minmax(360px, 0.94fr);
        gap: 46px;
    }
    .hero-visual {
        grid-template-columns: 0.95fr 1.05fr;
        align-items: center;
        padding: 26px;
    }
    .status-card {
        align-self: stretch;
    }
    .docs-layout {
        grid-template-columns: 250px minmax(0, 1fr);
        gap: 30px;
    }
    .docs-sidebar {
        position: sticky;
        top: 92px;
    }
    .docs-category-grid,
    .feature-grid,
    .risk-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
    .article-layout {
        grid-template-columns: minmax(0, 760px) 1fr;
        gap: 26px;
    }
    .article-body {
        padding: 30px;
    }
    .article-aside {
        position: sticky;
        top: 92px;
    }
    .download-flow {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }
}