:root {
    --primary: rgb(70,139,223);
    --primary-dark: #226ab9;
    --primary-soft: #eaf4ff;
    --primary-softer: #f5f9ff;
    --text: #13233a;
    --muted: #64748b;
    --line: #dce8f7;
    --card: #ffffff;
    --bg: #f7fbff;
    --radius: 18px;
    --shadow: 0 14px 35px rgba(31, 91, 151, .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(--text);
    background:
        radial-gradient(circle at 15% 0%, rgba(70,139,223,.12), transparent 28rem),
        linear-gradient(180deg, #ffffff 0%, var(--bg) 38%, #ffffff 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;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255,255,255,.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--line);
}

.site-header-inner {
    max-width: 1180px;
    margin: 0 auto;
    padding: 13px 18px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text);
    font-weight: 800;
}

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

.brand-text {
    letter-spacing: .02em;
}

.site-nav {
    display: none;
    flex-direction: column;
    width: 100%;
    position: absolute;
    left: 0;
    right: 0;
    top: 65px;
    padding: 12px 18px 18px;
    background: #ffffff;
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow);
}

.site-nav a {
    color: #334155;
    padding: 10px 12px;
    border-radius: 12px;
    font-weight: 600;
}

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

.nav-toggle {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.nav-toggle-label {
    width: 42px;
    height: 42px;
    border: 1px solid var(--line);
    border-radius: 14px;
    display: grid;
    place-content: center;
    gap: 5px;
    background: #fff;
}

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

.nav-toggle:checked ~ .site-nav {
    display: flex;
}

.page-main {
    min-height: 70vh;
}

.container,
.docs-container,
.page-container {
    width: min(100% - 36px, 1180px);
    margin: 0 auto;
}

.section {
    padding: 34px 0;
}

.docs-hero {
    width: min(100% - 36px, 1180px);
    margin: 0 auto;
    padding: 40px 0 22px;
    display: grid;
    gap: 26px;
}

.hero-copy {
    padding: 18px 0;
}

.eyebrow,
.doc-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 5px 11px;
    border-radius: 999px;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-size: 13px;
    font-weight: 700;
    border: 1px solid rgba(70,139,223,.18);
}

h1,
h2,
h3 {
    line-height: 1.25;
    letter-spacing: -.02em;
    color: #10213a;
}

h1 {
    font-size: clamp(30px, 7vw, 52px);
    margin: 16px 0 14px;
}

h2 {
    font-size: clamp(24px, 4vw, 34px);
    margin: 0 0 16px;
}

h3 {
    font-size: 19px;
    margin: 0 0 10px;
}

.lead {
    color: #40516b;
    font-size: 17px;
    max-width: 720px;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 14px;
    margin-top: 22px;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 12px 24px;
    border-radius: 14px;
    background: var(--primary);
    color: #ffffff;
    font-weight: 800;
    border: 1px solid rgba(70,139,223,.25);
    box-shadow: 0 10px 20px rgba(70,139,223,.22);
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}

.download-btn:hover {
    color: #ffffff;
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 14px 26px rgba(70,139,223,.26);
}

.security-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 9px;
    margin-top: 18px;
}

.security-tags span {
    border: 1px solid var(--line);
    background: #fff;
    border-radius: 999px;
    padding: 6px 10px;
    color: #43546c;
    font-size: 13px;
}

.hero-visual {
    border: 1px solid var(--line);
    border-radius: 28px;
    background: linear-gradient(135deg, #ffffff 0%, #eff7ff 100%);
    box-shadow: var(--shadow);
    padding: 20px;
    display: grid;
    gap: 14px;
}

.app-frame {
    display: grid;
    place-items: center;
    padding: 12px;
}

.app-frame img {
    width: min(100%, 360px);
    filter: drop-shadow(0 18px 26px rgba(31,91,151,.15));
}

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

.status-card,
.info-card,
.category-card,
.doc-card,
.risk-item,
.faq-item,
.step-card,
.principle-item,
.feature-card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: 0 8px 24px rgba(31,91,151,.05);
}

.status-card {
    padding: 14px;
}

.status-card strong {
    display: block;
    color: #12203a;
}

.status-card p {
    margin: 4px 0 0;
    color: var(--muted);
    font-size: 14px;
}

.safety-strip {
    width: min(100% - 36px, 1180px);
    margin: 0 auto 18px;
    display: grid;
    gap: 10px;
    padding: 14px;
    border-radius: 18px;
    background: var(--primary-soft);
    border: 1px solid rgba(70,139,223,.18);
}

.safety-strip span {
    display: flex;
    gap: 8px;
    color: #23415f;
    font-weight: 600;
}

.docs-layout {
    width: min(100% - 36px, 1180px);
    margin: 24px auto;
    display: grid;
    gap: 22px;
}

.docs-sidebar {
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: rgba(255,255,255,.9);
    padding: 14px;
    box-shadow: var(--shadow);
}

.docs-sidebar h2,
.docs-sidebar h3 {
    font-size: 16px;
    margin-bottom: 12px;
}

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

.docs-sidebar a,
.sidebar-links a {
    padding: 10px 12px;
    border-radius: 12px;
    color: #40516b;
    background: #f8fbff;
    border: 1px solid transparent;
}

.docs-sidebar a:hover,
.sidebar-links a:hover {
    color: var(--primary-dark);
    border-color: rgba(70,139,223,.22);
    background: var(--primary-soft);
}

.docs-content {
    display: grid;
    gap: 24px;
}

.content-panel,
.security-panel,
.cta-section,
.page-card {
    border: 1px solid var(--line);
    border-radius: 24px;
    background: rgba(255,255,255,.92);
    box-shadow: var(--shadow);
    padding: 22px;
}

.panel-title {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    flex-wrap: wrap;
}

.muted {
    color: var(--muted);
}

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

.step-card {
    position: relative;
    padding: 18px 18px 18px 62px;
}

.step-card::before {
    counter-increment: steps;
    content: counter(steps, decimal-leading-zero);
    position: absolute;
    left: 18px;
    top: 18px;
    width: 32px;
    height: 32px;
    border-radius: 11px;
    display: grid;
    place-items: center;
    background: var(--primary-soft);
    color: var(--primary-dark);
    font-weight: 800;
}

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

.category-card,
.doc-card,
.feature-card,
.risk-item,
.faq-item {
    padding: 18px;
}

.category-card p,
.doc-card p,
.feature-card p,
.risk-item p,
.faq-item p {
    margin: 0 0 10px;
    color: var(--muted);
}

.category-card a,
.doc-card a,
.risk-item a,
.step-card a {
    font-weight: 800;
}

.security-panel {
    background: linear-gradient(135deg, #ffffff, #f3f9ff);
}

.notice,
.note,
.warning,
.tip {
    border-left: 4px solid var(--primary);
    background: var(--primary-soft);
    border-radius: 14px;
    padding: 14px 16px;
    color: #28435f;
}

.warning {
    border-left-color: #f59e0b;
    background: #fff7ed;
}

.note {
    border-left-color: #7c9fcb;
}

.tip {
    border-left-color: #16a34a;
    background: #effaf3;
}

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

.principle-item {
    padding: 16px;
    display: grid;
    gap: 8px;
}

.principle-number {
    color: var(--primary-dark);
    font-weight: 900;
    font-size: 20px;
}

.cta-section {
    text-align: center;
    background: linear-gradient(135deg, #f4f9ff, #ffffff);
}

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

.page-hero {
    width: min(100% - 36px, 980px);
    margin: 0 auto;
    padding: 40px 0 20px;
}

.page-hero h1 {
    font-size: clamp(30px, 6vw, 46px);
}

.article-layout {
    width: min(100% - 36px, 1100px);
    margin: 10px auto 44px;
    display: grid;
    gap: 22px;
}

.article-content {
    display: grid;
    gap: 18px;
}

.article-content .page-card p {
    color: #40516b;
}

.reader-width {
    max-width: 760px;
}

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

.check-list li,
.number-list li {
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 12px 14px;
    background: #fff;
    color: #40516b;
}

.number-list {
    counter-reset: item;
}

.number-list li::before {
    counter-increment: item;
    content: counter(item) ". ";
    color: var(--primary-dark);
    font-weight: 900;
}

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

.faq-item h2,
.faq-item h3 {
    font-size: 18px;
    margin: 0 0 8px;
}

.site-footer {
    background: #f1f7ff;
    border-top: 1px solid var(--line);
    padding: 34px 18px 20px;
}

.footer-grid {
    width: min(100%, 1180px);
    margin: 0 auto;
    display: grid;
    gap: 22px;
}

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

.footer-logo {
    width: 34px;
    height: 34px;
    border-radius: 10px;
}

.site-footer p {
    color: var(--muted);
    max-width: 520px;
}

.site-footer a {
    display: block;
    margin: 7px 0;
    color: #40516b;
}

.footer-bottom {
    width: min(100%, 1180px);
    margin: 24px auto 0;
    padding-top: 16px;
    border-top: 1px solid var(--line);
    color: var(--muted);
    font-size: 14px;
}

@media (min-width: 700px) {
    .docs-category-grid,
    .feature-grid,
    .risk-grid,
    .faq-grid,
    .card-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

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

    .footer-grid {
        grid-template-columns: 2fr 1fr 1fr;
    }
}

@media (min-width: 980px) {
    .site-nav {
        display: flex;
        position: static;
        width: auto;
        flex-direction: row;
        align-items: center;
        padding: 0;
        box-shadow: none;
        border: 0;
        background: transparent;
    }

    .nav-toggle-label {
        display: none;
    }

    .docs-hero {
        grid-template-columns: minmax(0, 1.05fr) minmax(340px, .95fr);
        align-items: center;
        padding: 64px 0 30px;
    }

    .hero-copy {
        padding-right: 20px;
    }

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

    .docs-sidebar {
        position: sticky;
        top: 88px;
    }

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

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

    .article-aside {
        position: sticky;
        top: 88px;
    }

    .principle-item {
        grid-template-columns: 64px minmax(0, 1fr);
        align-items: start;
    }
}