:root {
    --primary: rgb(70,139,223);
    --primary-soft: rgba(70,139,223,.10);
    --primary-light: rgba(70,139,223,.16);
    --ink: #102033;
    --muted: #5d6b7c;
    --line: #dbe7f5;
    --bg: #f7fbff;
    --panel: #ffffff;
    --blue-gray: #edf5ff;
    --deep: #0d2746;
    --shadow: 0 20px 60px rgba(40, 86, 140, .10);
    --radius: 22px;
}

* { 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);
    background: linear-gradient(180deg, #f8fbff 0%, #ffffff 42%, #f4f9ff 100%);
    line-height: 1.72;
    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,.86);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(70,139,223,.12);
}
.header-inner {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: .02em; }
.brand-logo { width: 38px; height: 38px; object-fit: contain; }
.brand-text { font-size: 18px; color: var(--deep); }
.nav-toggle { position: absolute; opacity: 0; pointer-events: none; }
.nav-toggle-label {
    border: 1px solid var(--line);
    color: var(--deep);
    padding: 8px 13px;
    border-radius: 999px;
    font-size: 14px;
    background: #fff;
}
.site-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 72px;
    display: none;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: rgba(255,255,255,.97);
    box-shadow: var(--shadow);
}
.nav-toggle:checked ~ .site-nav { display: grid; gap: 6px; }
.site-nav a {
    padding: 10px 12px;
    border-radius: 12px;
    color: #3e5066;
    font-size: 15px;
}
.site-nav a.active,
.site-nav a:hover { color: var(--primary); background: var(--primary-soft); }

.content-container,
.section,
.hero-inner,
.footer-inner {
    width: min(1180px, calc(100% - 32px));
    margin-left: auto;
    margin-right: auto;
}
.section { padding: 64px 0; }
.section-kicker,
.badge,
.chapter-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary);
    background: var(--primary-soft);
    border: 1px solid rgba(70,139,223,.18);
    border-radius: 999px;
    padding: 6px 12px;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: .04em;
}
.section-title,
.page-title {
    margin: 16px 0 18px;
    font-size: clamp(30px, 6vw, 64px);
    line-height: 1.08;
    letter-spacing: -.05em;
    color: var(--deep);
}
.section-lead,
.page-lead {
    color: var(--muted);
    font-size: 17px;
    max-width: 760px;
}

.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;
    letter-spacing: .02em;
    box-shadow: 0 14px 30px rgba(70,139,223,.26);
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.download-btn:hover { transform: translateY(-2px); box-shadow: 0 18px 34px rgba(70,139,223,.32); background: #3e83d8; }

.magazine-hero {
    padding: 50px 0 62px;
    position: relative;
}
.hero-inner {
    display: grid;
    gap: 34px;
    align-items: center;
}
.hero-copy h1 {
    margin: 18px 0;
    font-size: clamp(38px, 10vw, 86px);
    line-height: .98;
    letter-spacing: -.065em;
    color: var(--deep);
}
.hero-copy p { color: var(--muted); font-size: 17px; max-width: 680px; }
.hero-actions { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; margin-top: 26px; }
.hero-note { color: #607189; font-size: 14px; }
.safety-tags { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 24px; }
.safety-tags span {
    border: 1px solid rgba(70,139,223,.18);
    background: rgba(255,255,255,.72);
    padding: 8px 12px;
    border-radius: 999px;
    color: #294562;
    font-size: 13px;
}
.product-visual {
    position: relative;
    min-height: 440px;
    border-radius: 32px;
    background: radial-gradient(circle at 15% 10%, rgba(70,139,223,.22), transparent 36%), linear-gradient(145deg, #f7fbff 0%, #e7f2ff 100%);
    border: 1px solid rgba(70,139,223,.16);
    box-shadow: var(--shadow);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 26px;
}
.app-image { width: min(260px, 72vw); filter: drop-shadow(0 30px 32px rgba(34,80,130,.18)); }
.status-card,
.backup-card,
.asset-card {
    position: absolute;
    padding: 14px 16px;
    border-radius: 18px;
    background: rgba(255,255,255,.88);
    border: 1px solid rgba(70,139,223,.16);
    box-shadow: 0 16px 34px rgba(38, 80, 130, .11);
    color: var(--deep);
    font-size: 13px;
}
.status-card { top: 28px; left: 18px; }
.backup-card { right: 18px; top: 46%; }
.asset-card { left: 22px; bottom: 28px; }
.status-card strong,
.backup-card strong,
.asset-card strong { display: block; font-size: 15px; margin-bottom: 3px; }

.brand-statement {
    width: min(1080px, calc(100% - 32px));
    margin: 0 auto;
    padding: 42px 26px;
    border-radius: 30px;
    background: linear-gradient(135deg, rgba(70,139,223,.12), rgba(255,255,255,.94));
    border: 1px solid rgba(70,139,223,.17);
}
.statement-quote {
    margin: 0 0 18px;
    font-size: clamp(28px, 6vw, 58px);
    line-height: 1.12;
    letter-spacing: -.05em;
    color: var(--deep);
    font-weight: 850;
}
.statement-text {
    max-width: 880px;
    color: #485b72;
    font-size: 17px;
}
.statement-columns {
    margin-top: 28px;
    display: grid;
    gap: 14px;
}
.statement-columns p {
    margin: 0;
    padding: 18px;
    border-left: 2px solid var(--primary);
    background: rgba(255,255,255,.7);
    border-radius: 16px;
    color: #40546a;
}

.story-timeline { position: relative; display: grid; gap: 18px; margin-top: 34px; }
.timeline-item {
    position: relative;
    padding: 22px;
    border-radius: 24px;
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: 0 14px 40px rgba(40, 86, 140, .06);
}
.timeline-number { color: var(--primary); font-weight: 900; letter-spacing: .08em; font-size: 13px; }
.timeline-item h3 { margin: 8px 0 8px; color: var(--deep); font-size: 22px; line-height: 1.26; }
.timeline-item p { color: var(--muted); margin: 0 0 12px; }
.text-link { color: var(--primary); font-weight: 750; }
.text-link:hover { text-decoration: underline; }

.split-section {
    display: grid;
    gap: 24px;
    align-items: stretch;
    margin-top: 28px;
}
.split-copy,
.split-panel,
.info-panel,
.guide-panel {
    border-radius: 28px;
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: 0 18px 54px rgba(40, 86, 140, .07);
    padding: 26px;
}
.split-copy h3 { margin-top: 0; font-size: clamp(26px, 5vw, 44px); line-height: 1.12; letter-spacing: -.04em; color: var(--deep); }
.split-copy p { color: var(--muted); }
.split-list { display: grid; gap: 12px; margin-top: 18px; }
.split-list div, .panel-row {
    display: flex;
    justify-content: space-between;
    gap: 18px;
    border-bottom: 1px solid var(--line);
    padding: 13px 0;
    color: #4f6176;
}
.split-list div:last-child, .panel-row:last-child { border-bottom: 0; }
.panel-label { font-weight: 760; color: var(--deep); }
.panel-value { color: var(--primary); text-align: right; }
.split-panel { background: linear-gradient(160deg, #ffffff 0%, #eef7ff 100%); }
.big-number {
    font-size: clamp(52px, 14vw, 112px);
    line-height: .9;
    color: rgba(70,139,223,.18);
    font-weight: 900;
    letter-spacing: -.07em;
}

.chapter-index {
    display: grid;
    gap: 26px;
    align-items: start;
}
.chapter-list { display: grid; gap: 10px; }
.chapter-entry {
    display: grid;
    grid-template-columns: 54px 1fr;
    gap: 14px;
    align-items: start;
    padding: 18px 0;
    border-bottom: 1px solid var(--line);
}
.chapter-entry:last-child { border-bottom: 0; }
.chapter-entry span { color: var(--primary); font-weight: 900; letter-spacing: .08em; }
.chapter-entry h3 { margin: 0 0 6px; color: var(--deep); font-size: 21px; }
.chapter-entry p { margin: 0 0 8px; color: var(--muted); }

.scenario-story-grid { display: grid; gap: 16px; margin-top: 30px; }
.scenario-card {
    border-radius: 26px;
    padding: 24px;
    min-height: 210px;
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: 0 16px 44px rgba(40,86,140,.06);
}
.scenario-card.featured { background: linear-gradient(135deg, #ffffff, #edf6ff); }
.scenario-card h3 { margin: 0 0 10px; color: var(--deep); font-size: 23px; }
.scenario-card p { color: var(--muted); margin: 0 0 16px; }

.risk-panel {
    margin-top: 30px;
    border-radius: 30px;
    padding: 24px;
    background: linear-gradient(135deg, rgba(70,139,223,.13), #ffffff 58%, #f0f7ff);
    border: 1px solid rgba(70,139,223,.17);
}
.risk-grid { display: grid; gap: 14px; margin-top: 18px; }
.risk-item {
    background: rgba(255,255,255,.75);
    border: 1px solid rgba(70,139,223,.15);
    border-radius: 20px;
    padding: 18px;
}
.risk-item h3 { margin: 0 0 8px; color: var(--deep); font-size: 19px; }
.risk-item p { margin: 0; color: var(--muted); }

.faq-list { display: grid; gap: 14px; margin-top: 28px; }
.faq-item {
    padding: 20px;
    border-radius: 22px;
    background: #fff;
    border: 1px solid var(--line);
}
.faq-item h3 { margin: 0 0 8px; color: var(--deep); font-size: 20px; }
.faq-item p { margin: 0; color: var(--muted); }

.cta-section {
    width: min(1080px, calc(100% - 32px));
    margin: 28px auto 76px;
    text-align: center;
    padding: 46px 22px;
    border-radius: 34px;
    border: 1px solid rgba(70,139,223,.16);
    background: radial-gradient(circle at 20% 10%, rgba(70,139,223,.18), transparent 34%), linear-gradient(135deg, #ffffff, #ebf5ff);
    box-shadow: var(--shadow);
}
.cta-section h2 { margin: 0 0 12px; font-size: clamp(28px, 6vw, 52px); line-height: 1.12; letter-spacing: -.045em; color: var(--deep); }
.cta-section p { max-width: 640px; margin: 0 auto 24px; color: var(--muted); }

.page-hero { padding: 52px 0 30px; }
.page-shell { display: grid; gap: 24px; align-items: start; }
.article-card {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 30px;
    padding: 24px;
    box-shadow: 0 20px 56px rgba(40,86,140,.07);
}
.article-card h2 { color: var(--deep); font-size: clamp(24px, 4vw, 36px); line-height: 1.18; letter-spacing: -.03em; margin: 26px 0 12px; }
.article-card h2:first-child { margin-top: 0; }
.article-card p { color: #4f6176; }
.guide-layout { display: grid; gap: 24px; }
.guide-sidebar { display: grid; gap: 16px; }
.guide-panel { padding: 20px; }
.guide-panel h3 { margin: 0 0 10px; color: var(--deep); }
.guide-panel ul,
.article-card ul,
.article-card ol { padding-left: 20px; color: #4f6176; }
.guide-panel li,
.article-card li { margin: 8px 0; }
.notice-box,
.checklist,
.step-list {
    margin: 22px 0;
    padding: 20px;
    border-radius: 22px;
    border: 1px solid rgba(70,139,223,.18);
    background: var(--primary-soft);
}
.step-list { counter-reset: step; display: grid; gap: 12px; }
.step-row { display: grid; grid-template-columns: 42px 1fr; gap: 12px; align-items: start; }
.step-row::before {
    counter-increment: step;
    content: counter(step, decimal-leading-zero);
    color: var(--primary);
    font-weight: 900;
    letter-spacing: .08em;
}
.step-row h3 { margin: 0 0 4px; font-size: 19px; color: var(--deep); }
.step-row p { margin: 0; color: var(--muted); }
.page-download { margin-top: 26px; }
.related-links { display: grid; gap: 10px; }
.related-links a { padding: 12px 0; border-bottom: 1px solid var(--line); color: var(--primary); font-weight: 700; }
.related-links a:last-child { border-bottom: 0; }

.site-footer {
    border-top: 1px solid var(--line);
    background: #fff;
    padding: 34px 0 18px;
}
.footer-inner { display: grid; gap: 24px; }
.footer-logo { width: 42px; height: 42px; margin-bottom: 12px; }
.footer-brand p { color: var(--muted); max-width: 560px; margin: 0; }
.footer-links { display: grid; gap: 8px; }
.footer-links a { color: #506277; }
.footer-links a:hover { color: var(--primary); }
.footer-bottom {
    width: min(1180px, calc(100% - 32px));
    margin: 24px auto 0;
    padding-top: 18px;
    border-top: 1px solid var(--line);
    color: #788699;
    font-size: 13px;
}

@media (min-width: 720px) {
    .statement-columns { grid-template-columns: repeat(3, 1fr); }
    .scenario-story-grid { grid-template-columns: repeat(2, 1fr); }
    .risk-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-inner { grid-template-columns: 1fr auto; }
    .footer-links { grid-template-columns: repeat(2, max-content); column-gap: 28px; }
}

@media (min-width: 980px) {
    .nav-toggle-label { display: none; }
    .site-nav {
        position: static;
        display: flex;
        align-items: center;
        gap: 4px;
        padding: 0;
        border: 0;
        box-shadow: none;
        background: transparent;
    }
    .site-nav a { font-size: 14px; padding: 9px 11px; }
    .magazine-hero { padding: 76px 0 96px; }
    .hero-inner { grid-template-columns: 1.05fr .95fr; gap: 54px; }
    .product-visual { min-height: 560px; }
    .brand-statement { padding: 64px; }
    .story-timeline { grid-template-columns: 1fr 1fr; gap: 22px 44px; }
    .timeline-item:nth-child(even) { transform: translateY(38px); }
    .split-section { grid-template-columns: 1fr 1fr; gap: 28px; }
    .chapter-index { grid-template-columns: .75fr 1.25fr; gap: 64px; }
    .scenario-story-grid { grid-template-columns: 1.2fr .8fr .8fr; }
    .scenario-card.featured { grid-row: span 2; }
    .risk-grid { grid-template-columns: repeat(3, 1fr); }
    .page-shell, .guide-layout { grid-template-columns: minmax(0, 1fr) 320px; gap: 34px; }
    .article-card { padding: 36px; }
}