:root {
    --primary: rgb(70,139,223);
    --primary-deep: #1f5fae;
    --ink: #102033;
    --muted: #63748a;
    --line: rgba(70,139,223,.18);
    --pale: #f3f8ff;
    --pale-2: #eef6ff;
    --white: #ffffff;
    --shadow: 0 22px 55px rgba(31, 95, 174, .10);
    --radius: 24px;
}

* { box-sizing: border-box; }
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(--ink);
    background: linear-gradient(180deg, #ffffff 0%, #f7fbff 38%, #ffffff 100%);
    line-height: 1.8;
    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,.88);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(70,139,223,.12);
}
.nav-shell {
    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: 700; letter-spacing: .02em; }
.brand-logo { width: 38px; height: 38px; object-fit: contain; }
.brand-text { font-size: 17px; }
.nav-toggle { display: none; }
.nav-trigger {
    width: 42px;
    height: 42px;
    border: 1px solid var(--line);
    border-radius: 14px;
    display: grid;
    place-content: center;
    gap: 5px;
    cursor: pointer;
}
.nav-trigger span { width: 18px; height: 2px; background: var(--ink); border-radius: 2px; display: block; }
.site-nav {
    display: none;
    position: absolute;
    left: 16px;
    right: 16px;
    top: 78px;
    padding: 14px;
    background: rgba(255,255,255,.98);
    border: 1px solid var(--line);
    border-radius: 20px;
    box-shadow: var(--shadow);
}
.site-nav a { display: block; padding: 10px 12px; color: var(--muted); font-size: 15px; }
.site-nav a:hover { color: var(--primary); }
.nav-toggle:checked ~ .site-nav { display: block; }

.content-container,
.section,
.magazine-hero,
.page-hero,
.footer-shell {
    width: min(1160px, calc(100% - 32px));
    margin: 0 auto;
}
.section { padding: 58px 0; }
.section-eyebrow,
.page-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary-deep);
    background: rgba(70,139,223,.10);
    border: 1px solid rgba(70,139,223,.14);
    padding: 7px 12px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: .04em;
}
h1, h2, h3 { line-height: 1.16; margin: 0 0 18px; letter-spacing: -.04em; }
h1 { font-size: clamp(36px, 9vw, 76px); }
h2 { font-size: clamp(28px, 6vw, 52px); }
h3 { font-size: clamp(20px, 4vw, 30px); }
p { margin: 0 0 16px; color: var(--muted); }
.lead { font-size: clamp(17px, 3.8vw, 22px); color: #405169; }

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 24px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 800;
    box-shadow: 0 16px 34px rgba(70,139,223,.24);
    transition: transform .2s ease, box-shadow .2s ease;
}
.download-btn:hover { transform: translateY(-2px); box-shadow: 0 18px 42px rgba(70,139,223,.30); }

.magazine-hero {
    padding: 54px 0 72px;
    display: grid;
    gap: 36px;
    align-items: center;
}
.hero-copy { max-width: 720px; }
.hero-copy .download-btn { margin: 12px 0 18px; }
.security-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
.security-tags span {
    border: 1px solid var(--line);
    background: rgba(255,255,255,.72);
    color: #405169;
    border-radius: 999px;
    padding: 8px 12px;
    font-size: 13px;
}
.product-visual {
    position: relative;
    border-radius: 34px;
    padding: 28px;
    background: radial-gradient(circle at 25% 20%, rgba(70,139,223,.18), transparent 34%), linear-gradient(145deg, #f5faff, #ffffff);
    box-shadow: var(--shadow);
    border: 1px solid rgba(70,139,223,.14);
    min-height: 430px;
    display: grid;
    place-items: center;
}
.product-visual img.app-shot { width: min(430px, 86%); margin: 0 auto; filter: drop-shadow(0 24px 40px rgba(28,74,136,.16)); }
.float-card {
    position: relative;
    width: 100%;
    margin-top: 12px;
    border: 1px solid rgba(70,139,223,.14);
    background: rgba(255,255,255,.90);
    border-radius: 18px;
    padding: 14px;
    box-shadow: 0 14px 34px rgba(31,95,174,.08);
}
.float-card strong { display: block; color: var(--ink); }
.float-card span { display: block; color: var(--muted); font-size: 13px; }

.brand-statement {
    width: min(1060px, calc(100% - 32px));
    margin: 0 auto;
    padding: 48px 24px;
    border-radius: 32px;
    background: linear-gradient(135deg, #f2f8ff 0%, #ffffff 72%);
    border: 1px solid var(--line);
}
.statement-quote {
    font-size: clamp(28px, 6.5vw, 54px);
    line-height: 1.18;
    letter-spacing: -.05em;
    color: var(--ink);
    margin-bottom: 22px;
}
.statement-grid { display: grid; gap: 20px; }

.split-section {
    display: grid;
    gap: 24px;
    align-items: center;
    margin-top: 26px;
}
.split-panel,
.info-panel,
.guide-card,
.faq-item,
.scenario-card,
.download-panel,
.article-card,
.side-note {
    background: rgba(255,255,255,.92);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}
.split-panel { padding: 26px; }
.info-panel { padding: 24px; background: linear-gradient(145deg, #eef6ff, #ffffff); }
.info-row { display: flex; justify-content: space-between; gap: 14px; padding: 14px 0; border-bottom: 1px solid rgba(70,139,223,.14); }
.info-row:last-child { border-bottom: 0; }
.info-row span { color: var(--muted); }
.info-row strong { color: var(--primary-deep); }

.story-timeline { margin-top: 30px; position: relative; display: grid; gap: 18px; }
.timeline-item {
    display: grid;
    gap: 12px;
    padding: 22px;
    border: 1px solid var(--line);
    border-radius: 22px;
    background: #fff;
    box-shadow: 0 14px 32px rgba(31,95,174,.06);
}
.timeline-num { color: var(--primary); font-size: 13px; font-weight: 900; letter-spacing: .10em; }
.text-link { color: var(--primary-deep); font-weight: 800; }
.text-link:hover { text-decoration: underline; }

.chapter-index {
    display: grid;
    gap: 26px;
    align-items: start;
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    padding: 40px 0;
}
.chapter-list { display: grid; gap: 4px; }
.chapter-item {
    display: grid;
    grid-template-columns: 56px 1fr;
    gap: 16px;
    padding: 18px 0;
    border-bottom: 1px solid rgba(70,139,223,.13);
}
.chapter-item:last-child { border-bottom: 0; }
.chapter-num { color: var(--primary); font-weight: 900; letter-spacing: .1em; }
.chapter-item h3 { margin-bottom: 8px; font-size: 22px; }

.scenario-story-grid { display: grid; gap: 18px; margin-top: 24px; }
.scenario-card { padding: 22px; }
.scenario-card h3 { font-size: 22px; }
.risk-panel {
    margin-top: 24px;
    padding: 24px;
    border-radius: 30px;
    background: linear-gradient(135deg, #edf6ff 0%, #ffffff 100%);
    border: 1px solid var(--line);
}
.risk-grid { display: grid; gap: 16px; margin-top: 18px; }
.risk-item { padding: 18px; border-radius: 18px; background: rgba(255,255,255,.72); border: 1px solid rgba(70,139,223,.13); }
.risk-item strong { display: block; margin-bottom: 6px; }
.faq-list { display: grid; gap: 14px; margin-top: 22px; }
.faq-item { padding: 22px; }
.faq-item h3 { font-size: 20px; margin-bottom: 8px; }
.cta-section { padding: 62px 0 76px; }
.download-panel { text-align: center; padding: 38px 22px; background: linear-gradient(135deg, #eef6ff, #ffffff); }
.download-panel p { max-width: 680px; margin: 0 auto 22px; }

.page-hero { padding: 48px 0 28px; }
.page-hero p { max-width: 760px; }
.article-layout { width: min(1080px, calc(100% - 32px)); margin: 0 auto 72px; display: grid; gap: 24px; }
.article-card { padding: 28px; }
.article-card + .article-card { margin-top: 18px; }
.article-card ol,
.article-card ul,
.check-list { padding-left: 20px; color: var(--muted); }
.article-card li,
.check-list li { margin-bottom: 10px; }
.side-note { padding: 24px; background: linear-gradient(145deg, #f2f8ff, #fff); }
.side-note h2, .side-note h3 { font-size: 24px; }
.article-action { margin-top: 24px; }
.feature-list { display: grid; gap: 14px; margin-top: 18px; }
.feature-list div { padding: 16px; background: var(--pale); border: 1px solid rgba(70,139,223,.12); border-radius: 18px; }

.download-steps { counter-reset: step; display: grid; gap: 14px; margin: 26px 0; }
.download-steps div { counter-increment: step; padding: 18px; border-radius: 20px; border: 1px solid var(--line); background: #fff; }
.download-steps div::before { content: counter(step, decimal-leading-zero); display: block; color: var(--primary); font-weight: 900; letter-spacing: .1em; margin-bottom: 6px; }

.site-footer { border-top: 1px solid rgba(70,139,223,.14); background: #f8fbff; padding: 34px 0; }
.footer-shell { display: grid; gap: 24px; }
.footer-brand { font-weight: 900; margin-bottom: 8px; }
.footer-links { display: grid; gap: 10px; }
.footer-links a { color: var(--muted); }
.footer-links a:hover { color: var(--primary); }

@media (min-width: 760px) {
    .section { padding: 76px 0; }
    .magazine-hero { grid-template-columns: 1.02fr .98fr; padding-top: 80px; }
    .float-card { position: absolute; width: 210px; margin-top: 0; }
    .float-card.status { top: 28px; left: -12px; }
    .float-card.backup { right: -14px; bottom: 92px; }
    .float-card.asset { left: 36px; bottom: 28px; }
    .statement-grid { grid-template-columns: 1fr 1fr; }
    .split-section { grid-template-columns: 1fr 1fr; gap: 34px; }
    .story-timeline { grid-template-columns: 1fr 1fr; gap: 22px; }
    .timeline-item:nth-child(even) { transform: translateY(34px); }
    .chapter-index { grid-template-columns: .86fr 1.14fr; gap: 56px; }
    .scenario-story-grid { grid-template-columns: repeat(3, 1fr); }
    .risk-grid { grid-template-columns: repeat(2, 1fr); }
    .faq-list.two-col { grid-template-columns: 1fr 1fr; }
    .article-layout { grid-template-columns: minmax(0, 1fr) 320px; align-items: start; }
    .article-sidebar { position: sticky; top: 98px; }
    .footer-shell { grid-template-columns: 1fr auto; align-items: start; }
    .footer-links { grid-template-columns: repeat(2, max-content); gap: 12px 24px; }
}

@media (min-width: 980px) {
    .nav-trigger { display: none; }
    .site-nav { display: flex; position: static; padding: 0; background: transparent; border: 0; box-shadow: none; border-radius: 0; gap: 24px; }
    .site-nav a { padding: 0; }
    .magazine-hero { min-height: 720px; }
    .product-visual { min-height: 560px; }
    .brand-statement { padding: 72px; }
    .article-card { padding: 36px; }
}

@media (max-width: 420px) {
    .content-container,
    .section,
    .magazine-hero,
    .page-hero,
    .footer-shell,
    .article-layout { width: min(100% - 24px, 1160px); }
    .download-btn { width: 100%; }
    .product-visual { padding: 18px; border-radius: 26px; }
    .chapter-item { grid-template-columns: 44px 1fr; }
}