* {
    box-sizing: border-box;
}

:root {
    --primary: rgb(70,139,223);
    --primary-dark: #1f5fae;
    --primary-soft: #edf5ff;
    --text: #17233c;
    --muted: #65758f;
    --line: #dbe7f5;
    --panel: #ffffff;
    --bg: #f6f9fd;
    --safe: #f0f7ff;
    --radius: 18px;
    --shadow: 0 18px 45px rgba(39, 85, 143, .08);
}

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(--text);
    background: linear-gradient(180deg, #f7fbff 0%, #ffffff 42%, #f5f8fc 100%);
    line-height: 1.72;
    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: 30;
    background: rgba(255,255,255,.94);
    border-bottom: 1px solid rgba(219,231,245,.8);
    backdrop-filter: blur(14px);
}

.header-inner {
    max-width: 1180px;
    margin: 0 auto;
    padding: 12px 18px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--text);
    font-weight: 800;
    letter-spacing: -.02em;
}

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

.brand-text {
    font-size: 16px;
    white-space: nowrap;
}

.nav-toggle {
    width: 42px;
    height: 42px;
    border: 1px solid var(--line);
    border-radius: 13px;
    background: #fff;
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    padding: 0 10px;
}

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

.site-nav {
    display: none;
    position: absolute;
    left: 16px;
    right: 16px;
    top: 66px;
    padding: 12px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: var(--shadow);
}

.site-nav.open {
    display: grid;
    gap: 6px;
}

.site-nav a {
    color: #30425f;
    padding: 10px 12px;
    border-radius: 12px;
    font-size: 15px;
    font-weight: 600;
}

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

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

.container,
.docs-hero,
.safety-strip,
.docs-layout,
.cta-section,
.page-section,
.doc-page,
.footer-inner {
    width: min(100% - 32px, 1180px);
    margin-inline: auto;
}

.docs-hero {
    padding: 38px 0 22px;
    display: grid;
    gap: 26px;
}

.hero-copy {
    background: linear-gradient(145deg, #ffffff 0%, #f5faff 100%);
    border: 1px solid var(--line);
    border-radius: 28px;
    padding: 28px;
    box-shadow: var(--shadow);
}

.eyebrow,
.doc-badge {
    display: inline-flex;
    align-items: center;
    width: fit-content;
    color: var(--primary-dark);
    background: var(--primary-soft);
    border: 1px solid #cfe4ff;
    border-radius: 999px;
    padding: 5px 11px;
    font-size: 13px;
    font-weight: 700;
    margin-bottom: 12px;
}

h1, h2, h3 {
    line-height: 1.28;
    color: #12213a;
    margin: 0 0 12px;
}

h1 {
    font-size: clamp(30px, 8vw, 56px);
    letter-spacing: -.045em;
}

h2 {
    font-size: clamp(24px, 5vw, 34px);
    letter-spacing: -.025em;
    margin-top: 6px;
}

h3 {
    font-size: 19px;
}

p {
    margin: 0 0 14px;
}

.lead {
    color: #4b5f7d;
    font-size: 17px;
    max-width: 720px;
}

.download-btn {
    display: inline-flex;
    min-height: 48px;
    align-items: center;
    justify-content: center;
    border: 0;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    padding: 12px 24px;
    box-shadow: 0 12px 28px rgba(70,139,223,.24);
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}

.download-btn:hover {
    color: #fff;
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 16px 36px rgba(70,139,223,.28);
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 14px;
    margin: 22px 0 18px;
}

.security-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.security-tags span {
    color: #34506e;
    background: #fff;
    border: 1px solid var(--line);
    padding: 7px 10px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 700;
}

.hero-visual {
    position: relative;
    padding: 22px;
    border: 1px solid #d9e8f8;
    border-radius: 30px;
    background: radial-gradient(circle at 30% 20%, rgba(70,139,223,.16), transparent 30%), linear-gradient(160deg, #ffffff 0%, #edf6ff 100%);
    box-shadow: var(--shadow);
}

.app-frame {
    width: min(390px, 90%);
    margin: 0 auto;
}

.status-card {
    background: rgba(255,255,255,.92);
    border: 1px solid #dbe8f7;
    border-radius: 18px;
    padding: 15px;
    margin-top: 14px;
}

.status-card + .status-card {
    margin-top: 10px;
}

.status-card strong {
    display: block;
    color: #143963;
    margin-bottom: 4px;
}

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

.safety-strip {
    display: grid;
    gap: 10px;
    margin-top: 8px;
    margin-bottom: 24px;
    padding: 16px;
    border-radius: 20px;
    background: var(--safe);
    border: 1px solid #cfE4fb;
}

.safety-strip span {
    display: flex;
    gap: 8px;
    align-items: flex-start;
    color: #24425f;
    font-size: 14px;
}

.safety-strip span::before {
    content: "";
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--primary);
    flex: 0 0 auto;
    margin-top: 10px;
}

.docs-layout {
    display: grid;
    gap: 22px;
    align-items: start;
    padding: 16px 0 42px;
}

.docs-sidebar {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 22px;
    padding: 16px;
    box-shadow: 0 10px 30px rgba(31,95,174,.06);
}

.docs-sidebar strong {
    display: block;
    margin-bottom: 10px;
    color: #12213a;
}

.docs-sidebar a {
    display: block;
    padding: 10px 12px;
    border-radius: 12px;
    color: #3e536e;
    font-weight: 650;
    font-size: 14px;
}

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

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

.doc-section,
.page-card,
.doc-article,
.doc-aside,
.security-panel,
.faq-item,
.risk-item,
.category-card,
.step-row,
.notice-box,
.download-panel {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 22px;
    box-shadow: 0 10px 30px rgba(31,95,174,.055);
}

.doc-section {
    padding: 22px;
}

.section-kicker {
    display: block;
    color: var(--primary-dark);
    font-size: 13px;
    font-weight: 800;
    letter-spacing: .04em;
    margin-bottom: 7px;
}

.docs-steps {
    display: grid;
    gap: 12px;
    margin-top: 18px;
}

.step-row {
    display: grid;
    grid-template-columns: 42px 1fr;
    gap: 12px;
    padding: 16px;
}

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

.step-row p,
.category-card p,
.risk-item p,
.security-panel p,
.faq-item p,
.page-card p,
.doc-article p,
.doc-aside p {
    color: var(--muted);
}

.docs-category-grid,
.feature-grid,
.risk-grid,
.faq-grid,
.card-grid {
    display: grid;
    gap: 14px;
    margin-top: 16px;
}

.category-card,
.security-panel,
.risk-item,
.faq-item,
.page-card {
    padding: 18px;
}

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

.principle-list {
    display: grid;
    gap: 12px;
    margin-top: 16px;
}

.principle-item {
    display: grid;
    grid-template-columns: 42px 1fr;
    gap: 12px;
    padding: 16px 0;
    border-top: 1px solid var(--line);
}

.principle-item:first-child {
    border-top: 0;
}

.notice-box {
    padding: 16px 18px;
    background: var(--safe);
    border-left: 4px solid var(--primary);
}

.notice-box strong {
    color: #163e6b;
}

.cta-section {
    text-align: center;
    margin-top: 10px;
    margin-bottom: 52px;
    padding: 34px 20px;
    border: 1px solid #d7e8fa;
    border-radius: 28px;
    background: linear-gradient(135deg, #ffffff 0%, #edf6ff 100%);
    box-shadow: var(--shadow);
}

.cta-section p {
    max-width: 660px;
    margin-inline: auto;
    color: var(--muted);
}

.page-section,
.doc-page {
    padding: 36px 0 54px;
}

.page-hero {
    padding: 26px;
    border-radius: 28px;
    background: linear-gradient(135deg, #ffffff 0%, #eff7ff 100%);
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
    margin-bottom: 22px;
}

.page-summary {
    color: #526883;
    font-size: 17px;
    max-width: 820px;
}

.doc-shell {
    display: grid;
    gap: 18px;
    align-items: start;
}

.doc-article {
    padding: 22px;
}

.doc-aside {
    padding: 18px;
}

.doc-aside ul,
.check-list,
.step-list,
.faq-list {
    margin: 0;
    padding-left: 18px;
    color: var(--muted);
}

.doc-aside li,
.check-list li,
.step-list li,
.faq-list li {
    margin: 7px 0;
}

.inline-blocks {
    display: grid;
    gap: 12px;
    margin: 16px 0;
}

.split-list {
    display: grid;
    gap: 14px;
    margin: 18px 0;
}

.download-panel {
    padding: 24px;
    text-align: center;
}

.download-steps {
    counter-reset: downloadStep;
    display: grid;
    gap: 12px;
    margin: 20px 0;
}

.download-step {
    counter-increment: downloadStep;
    position: relative;
    padding: 15px 15px 15px 54px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 16px;
}

.download-step::before {
    content: counter(downloadStep);
    position: absolute;
    left: 14px;
    top: 15px;
    width: 28px;
    height: 28px;
    border-radius: 10px;
    background: var(--primary-soft);
    color: var(--primary-dark);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 900;
}

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

.faq-list-page .faq-item h2 {
    font-size: 20px;
}

.site-footer {
    background: #0f2440;
    color: #dbe8f8;
    margin-top: 20px;
}

.footer-inner {
    padding: 30px 0;
    display: grid;
    gap: 22px;
}

.footer-brand {
    display: flex;
    gap: 14px;
    align-items: flex-start;
}

.footer-logo {
    width: 42px;
    height: 42px;
    object-fit: contain;
}

.footer-brand p {
    color: #a9bad2;
    margin: 6px 0 0;
}

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

.footer-links a {
    color: #dbe8f8;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,.1);
    padding: 14px 18px;
    text-align: center;
    color: #9eb0c8;
    font-size: 13px;
}

@media (min-width: 680px) {
    .safety-strip {
        grid-template-columns: repeat(3, 1fr);
    }
    .docs-category-grid,
    .feature-grid,
    .risk-grid,
    .faq-grid,
    .card-grid,
    .split-list {
        grid-template-columns: repeat(2, 1fr);
    }
    .footer-inner {
        grid-template-columns: 1.3fr .7fr;
        align-items: start;
    }
}

@media (min-width: 960px) {
    .nav-toggle {
        display: none;
    }
    .site-nav {
        display: flex;
        position: static;
        border: 0;
        box-shadow: none;
        padding: 0;
        background: transparent;
        gap: 4px;
        align-items: center;
    }
    .docs-hero {
        grid-template-columns: 1.06fr .94fr;
        padding-top: 54px;
        align-items: center;
    }
    .docs-layout {
        grid-template-columns: 250px minmax(0, 1fr);
        gap: 28px;
    }
    .docs-sidebar {
        position: sticky;
        top: 88px;
    }
    .docs-category-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .feature-grid,
    .risk-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .doc-shell {
        grid-template-columns: minmax(0, 1fr) 290px;
    }
    .doc-article {
        padding: 30px;
    }
    .doc-aside {
        position: sticky;
        top: 88px;
    }
    .page-hero {
        padding: 34px;
    }
    .narrow-doc {
        width: min(100% - 32px, 1060px);
    }
}