* {
    box-sizing: border-box;
}

:root {
    --primary: rgb(70,139,223);
    --primary-dark: rgb(36, 94, 166);
    --primary-soft: rgb(236, 246, 255);
    --primary-softer: rgb(247, 251, 255);
    --text: #172033;
    --muted: #637089;
    --line: #dce8f6;
    --panel: #ffffff;
    --panel-blue: #f4f9ff;
    --shadow: 0 18px 50px rgba(70, 139, 223, .12);
    --radius: 18px;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at top left, rgba(70,139,223,.16), transparent 34rem),
        linear-gradient(180deg, #f9fcff 0%, #ffffff 36%, #f7fbff 100%);
    line-height: 1.75;
    overflow-x: hidden;
}

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

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

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,.94);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(220,232,246,.85);
}

.nav-wrap {
    width: min(1160px, calc(100% - 32px));
    margin: 0 auto;
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    color: #11213a;
    letter-spacing: .02em;
}

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

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

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

.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: 8px;
}

.site-nav a {
    padding: 11px 12px;
    border-radius: 12px;
    color: #2b3950;
    font-size: 15px;
}

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

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

.section {
    padding: 48px 0;
}

.section-title {
    margin: 0 0 12px;
    font-size: clamp(26px, 4vw, 38px);
    letter-spacing: -.03em;
    line-height: 1.25;
}

.section-desc {
    margin: 0 0 26px;
    color: var(--muted);
    max-width: 760px;
}

.docs-hero {
    width: min(1160px, calc(100% - 32px));
    margin: 26px auto 0;
    display: grid;
    gap: 28px;
    align-items: center;
    padding: 26px;
    border: 1px solid rgba(220,232,246,.9);
    border-radius: 28px;
    background:
        linear-gradient(135deg, rgba(255,255,255,.96), rgba(243,249,255,.92)),
        radial-gradient(circle at right top, rgba(70,139,223,.14), transparent 24rem);
    box-shadow: var(--shadow);
}

.docs-hero h1 {
    margin: 0;
    font-size: clamp(34px, 7vw, 58px);
    line-height: 1.12;
    letter-spacing: -.05em;
}

.hero-lead {
    margin: 18px 0 22px;
    color: #42506a;
    font-size: 17px;
}

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

.hero-tags span,
.card-tags span,
.doc-badge {
    display: inline-flex;
    align-items: center;
    border-radius: 999px;
    padding: 7px 12px;
    color: var(--primary-dark);
    background: var(--primary-soft);
    border: 1px solid rgba(70,139,223,.18);
    font-size: 13px;
    font-weight: 700;
}

.hero-visual {
    position: relative;
    display: grid;
    gap: 14px;
}

.app-frame {
    position: relative;
    display: grid;
    place-items: center;
    min-height: 300px;
    padding: 20px;
    border-radius: 24px;
    background: linear-gradient(145deg, #ffffff, #edf7ff);
    border: 1px solid var(--line);
}

.app-frame img {
    max-height: 360px;
    object-fit: contain;
    filter: drop-shadow(0 20px 30px rgba(70,139,223,.18));
}

.security-card,
.security-panel,
.doc-card,
.category-card,
.faq-item,
.risk-item,
.step-card,
.info-panel {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: 0 10px 28px rgba(20, 57, 100, .06);
}

.security-card {
    padding: 16px;
}

.security-card strong {
    display: block;
    margin-bottom: 4px;
}

.security-card p {
    margin: 0;
    color: var(--muted);
    font-size: 14px;
}

.safety-strip {
    width: min(1160px, calc(100% - 32px));
    margin: 22px auto 0;
    display: grid;
    gap: 10px;
    padding: 16px;
    border-radius: 18px;
    background: var(--primary-soft);
    border: 1px solid rgba(70,139,223,.18);
}

.safety-strip span {
    color: #2f4c72;
    font-size: 14px;
}

.docs-layout {
    width: min(1160px, calc(100% - 32px));
    margin: 44px auto;
    display: grid;
    gap: 24px;
}

.docs-sidebar {
    align-self: start;
    padding: 16px;
    background: rgba(255,255,255,.82);
    border: 1px solid var(--line);
    border-radius: 20px;
}

.docs-sidebar h2,
.docs-sidebar h3 {
    margin: 0 0 12px;
    font-size: 15px;
    color: #1f3350;
}

.docs-sidebar nav,
.docs-sidebar .side-list {
    display: grid;
    gap: 8px;
}

.docs-sidebar a {
    display: block;
    padding: 10px 12px;
    border-radius: 12px;
    color: #45546d;
    font-size: 14px;
}

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

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

.doc-section {
    padding: 24px;
    background: rgba(255,255,255,.9);
    border: 1px solid var(--line);
    border-radius: 22px;
}

.doc-section h2 {
    margin: 0 0 14px;
    font-size: clamp(24px, 4vw, 34px);
    letter-spacing: -.03em;
}

.doc-section h3 {
    margin-top: 0;
}

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

.step-card {
    padding: 18px;
    display: grid;
    gap: 8px;
}

.step-card .step-no {
    width: 38px;
    height: 38px;
    display: grid;
    place-items: center;
    border-radius: 12px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
}

.step-card h3 {
    margin: 0;
    font-size: 18px;
}

.step-card p {
    margin: 0;
    color: var(--muted);
}

.text-link {
    color: var(--primary-dark);
    font-weight: 800;
}

.docs-category-grid,
.risk-grid,
.feature-grid,
.faq-grid {
    display: grid;
    gap: 16px;
}

.category-card,
.doc-card,
.risk-item,
.faq-item,
.info-panel {
    padding: 20px;
}

.category-card h3,
.doc-card h3,
.risk-item h3,
.faq-item h3,
.info-panel h3 {
    margin: 0 0 8px;
    color: #18304e;
}

.category-card p,
.doc-card p,
.risk-item p,
.faq-item p,
.info-panel p {
    margin: 0 0 12px;
    color: var(--muted);
}

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

.principle-item {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 14px;
    padding: 18px;
    border-radius: 16px;
    background: var(--primary-softer);
    border: 1px solid var(--line);
}

.principle-item span {
    width: 34px;
    height: 34px;
    display: grid;
    place-items: center;
    border-radius: 11px;
    color: #fff;
    background: var(--primary);
    font-weight: 800;
}

.notice,
.tip-box {
    padding: 16px 18px;
    background: var(--primary-soft);
    border-left: 4px solid var(--primary);
    border-radius: 14px;
    color: #31547a;
}

.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;
    border: 1px solid rgba(70,139,223,.2);
    box-shadow: 0 10px 22px rgba(70,139,223,.22);
    transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}

.download-btn:hover {
    transform: translateY(-1px);
    background: var(--primary-dark);
    box-shadow: 0 14px 30px rgba(70,139,223,.28);
}

.cta-section {
    text-align: center;
    padding: 36px 22px;
    border-radius: 24px;
    background: linear-gradient(135deg, #f5faff, #eaf5ff);
    border: 1px solid rgba(70,139,223,.16);
}

.cta-section h2 {
    margin: 0 0 10px;
}

.cta-section p {
    margin: 0 auto 20px;
    color: var(--muted);
    max-width: 680px;
}

.page-hero {
    width: min(960px, calc(100% - 32px));
    margin: 34px auto 0;
    padding: 26px;
    border-radius: 24px;
    background: linear-gradient(135deg, rgba(255,255,255,.96), rgba(241,248,255,.96));
    border: 1px solid var(--line);
}

.page-hero h1 {
    margin: 12px 0;
    font-size: clamp(30px, 6vw, 48px);
    line-height: 1.18;
    letter-spacing: -.04em;
}

.page-hero p {
    color: var(--muted);
    margin: 0;
}

.article-wrap {
    width: min(960px, calc(100% - 32px));
    margin: 26px auto 54px;
    display: grid;
    gap: 22px;
}

.article-grid {
    display: grid;
    gap: 22px;
}

.article-main {
    min-width: 0;
    display: grid;
    gap: 20px;
}

.article-main section,
.article-aside {
    padding: 22px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 20px;
}

.article-main h2,
.article-aside h2 {
    margin: 0 0 12px;
    font-size: 23px;
}

.article-main p {
    color: #4d5b72;
}

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

.check-list li,
.clean-list li {
    padding: 12px 14px;
    border-radius: 14px;
    background: var(--primary-softer);
    border: 1px solid var(--line);
    color: #41536c;
}

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

.table-like div {
    display: grid;
    gap: 6px;
    padding: 14px;
    border-radius: 14px;
    border: 1px solid var(--line);
    background: #fff;
}

.faq-list li,
.faq-page-item {
    padding: 18px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: #fff;
}

.faq-page-item h2 {
    margin: 0 0 8px;
    font-size: 20px;
}

.faq-page-item p {
    margin: 0;
    color: var(--muted);
}

.download-panel {
    padding: 26px;
    border-radius: 24px;
    border: 1px solid var(--line);
    background: linear-gradient(135deg, #fff, #f3f9ff);
    text-align: center;
}

.site-footer {
    background: #10243d;
    color: rgba(255,255,255,.78);
    padding: 40px 0 22px;
}

.footer-grid {
    width: min(1160px, calc(100% - 32px));
    margin: 0 auto;
    display: grid;
    gap: 24px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #fff;
}

.footer-brand img {
    width: 36px;
    height: 36px;
    border-radius: 12px;
}

.site-footer h3 {
    margin: 0 0 10px;
    color: #fff;
    font-size: 16px;
}

.site-footer a {
    display: block;
    margin: 7px 0;
    color: rgba(255,255,255,.8);
}

.footer-bottom {
    width: min(1160px, calc(100% - 32px));
    margin: 28px auto 0;
    padding-top: 18px;
    border-top: 1px solid rgba(255,255,255,.12);
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: space-between;
    font-size: 13px;
    color: rgba(255,255,255,.58);
}

@media (min-width: 720px) {
    .docs-category-grid,
    .risk-grid,
    .feature-grid,
    .faq-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .docs-steps {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

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

    .footer-grid {
        grid-template-columns: 1.3fr .8fr 1fr;
    }
}

@media (min-width: 980px) {
    .nav-toggle {
        display: none;
    }

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

    .docs-hero {
        grid-template-columns: 1.05fr .95fr;
        padding: 42px;
    }

    .docs-layout {
        grid-template-columns: 248px minmax(0, 1fr);
        align-items: start;
    }

    .docs-sidebar {
        position: sticky;
        top: 94px;
    }

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

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

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

    .article-grid {
        grid-template-columns: minmax(0, 1fr) 280px;
        align-items: start;
    }

    .article-aside {
        position: sticky;
        top: 94px;
    }
}

@media (max-width: 520px) {
    .download-btn {
        width: 100%;
    }

    .doc-section,
    .page-hero,
    .article-main section,
    .article-aside,
    .download-panel {
        padding: 20px;
    }

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