* {
    box-sizing: border-box;
}

:root {
    --primary: rgb(70,139,223);
    --primary-soft: rgba(70,139,223,.12);
    --primary-line: rgba(70,139,223,.22);
    --ink: #102034;
    --muted: #5d6d82;
    --pale: #f5f9ff;
    --paper: #ffffff;
    --line: #dce7f5;
    --deep: #0d2646;
    --radius: 22px;
    --shadow: 0 18px 50px rgba(24, 64, 108, .10);
}

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%, #f8fbff 42%, #eef6ff 100%);
    line-height: 1.75;
    overflow-x: hidden;
}

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

img {
    max-width: 100%;
    display: block;
}

main {
    min-height: 70vh;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255,255,255,.88);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(220,231,245,.86);
}

.nav-wrap {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    letter-spacing: .02em;
    color: var(--deep);
}

.brand-logo {
    width: 34px;
    height: 34px;
    object-fit: contain;
}

.brand-text {
    white-space: nowrap;
}

.nav-toggle {
    border: 1px solid var(--line);
    background: var(--paper);
    color: var(--deep);
    border-radius: 14px;
    width: 44px;
    height: 42px;
    font-size: 21px;
    cursor: pointer;
}

.site-nav {
    position: absolute;
    top: 72px;
    left: 16px;
    right: 16px;
    display: none;
    flex-direction: column;
    gap: 6px;
    padding: 14px;
    background: rgba(255,255,255,.96);
    border: 1px solid var(--line);
    border-radius: 18px;
    box-shadow: var(--shadow);
}

.site-nav.is-open {
    display: flex;
}

.site-nav a {
    padding: 11px 12px;
    border-radius: 12px;
    color: #38516d;
    font-size: 15px;
}

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

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

.section {
    padding: 72px 0;
}

.section.kickered {
    padding-top: 40px;
}

.eyebrow,
.chapter-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary);
    background: var(--primary-soft);
    border: 1px solid var(--primary-line);
    border-radius: 999px;
    padding: 7px 12px;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: .04em;
}

.magazine-hero {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
    padding: 54px 0 80px;
    display: grid;
    gap: 34px;
    align-items: center;
}

.hero-copy h1,
.page-hero h1 {
    margin: 18px 0 18px;
    font-size: clamp(36px, 11vw, 80px);
    line-height: .98;
    letter-spacing: -.055em;
    color: var(--deep);
}

.hero-copy p,
.page-hero .lead {
    margin: 0;
    color: var(--muted);
    font-size: 17px;
    max-width: 680px;
}

.hero-actions {
    margin-top: 28px;
    display: flex;
    flex-wrap: wrap;
    gap: 18px;
    align-items: center;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 13px 24px;
    border-radius: 999px;
    color: #fff;
    background: rgb(70,139,223);
    font-weight: 700;
    letter-spacing: .02em;
    box-shadow: 0 16px 36px rgba(70,139,223,.26);
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}

.download-btn:hover {
    transform: translateY(-2px);
    background: #377fd3;
    box-shadow: 0 20px 44px rgba(70,139,223,.32);
}

.security-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 24px;
    padding: 0;
    list-style: none;
}

.security-tags li {
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 8px 12px;
    color: #44617e;
    background: #fff;
    font-size: 13px;
}

.product-visual {
    position: relative;
    min-height: 520px;
    border-radius: 34px;
    padding: 26px;
    background: radial-gradient(circle at 25% 15%, rgba(70,139,223,.24), transparent 28%), linear-gradient(145deg, #eff7ff 0%, #ffffff 55%, #e9f4ff 100%);
    border: 1px solid rgba(70,139,223,.16);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.product-visual .app-shot {
    width: min(310px, 78%);
    margin: 22px auto 0;
    filter: drop-shadow(0 30px 45px rgba(20,55,94,.18));
}

.floating-card {
    position: relative;
    margin: 12px 0;
    width: fit-content;
    max-width: 240px;
    padding: 14px 16px;
    border-radius: 18px;
    background: rgba(255,255,255,.92);
    border: 1px solid rgba(211,225,243,.9);
    box-shadow: 0 14px 30px rgba(22,66,110,.10);
    color: #2d4662;
    font-size: 13px;
}

.floating-card strong {
    display: block;
    color: var(--deep);
    font-size: 14px;
    margin-bottom: 2px;
}

.card-status {
    margin-left: auto;
}

.card-backup {
    margin-top: -10px;
}

.card-assets {
    margin-left: auto;
    margin-top: -18px;
}

.brand-statement {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
    padding: 42px 0 18px;
    display: grid;
    gap: 26px;
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
}

.statement-quote {
    margin: 0;
    font-size: clamp(28px, 7vw, 58px);
    line-height: 1.08;
    letter-spacing: -.045em;
    color: var(--deep);
}

.statement-text p {
    margin: 0 0 16px;
    color: var(--muted);
}

.split-section {
    display: grid;
    gap: 24px;
    align-items: center;
    margin: 28px 0;
    padding: 26px;
    border-radius: 28px;
    border: 1px solid var(--line);
    background: rgba(255,255,255,.74);
    box-shadow: var(--shadow);
}

.split-section.reverse .split-art {
    order: -1;
}

.split-copy .num,
.timeline-num,
.chapter-num {
    color: var(--primary);
    font-size: 13px;
    font-weight: 800;
    letter-spacing: .14em;
}

.split-copy h2,
.section-title,
.chapter-head h2 {
    margin: 10px 0 12px;
    font-size: clamp(28px, 8vw, 48px);
    line-height: 1.08;
    letter-spacing: -.04em;
    color: var(--deep);
}

.split-copy p,
.section-lead {
    color: var(--muted);
    margin: 0 0 14px;
}

.info-panel {
    border-radius: 24px;
    padding: 24px;
    background: linear-gradient(145deg, rgba(70,139,223,.14), rgba(255,255,255,.88));
    border: 1px solid rgba(70,139,223,.18);
}

.info-row {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
    padding: 16px 0;
    border-bottom: 1px solid rgba(70,139,223,.14);
}

.info-row:last-child {
    border-bottom: 0;
}

.info-row strong {
    color: var(--deep);
}

.info-row span {
    color: var(--muted);
    font-size: 14px;
    text-align: right;
}

.story-timeline {
    position: relative;
    display: grid;
    gap: 18px;
    margin-top: 30px;
}

.timeline-item {
    position: relative;
    padding: 22px;
    border-radius: 22px;
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: 0 14px 32px rgba(26,70,112,.07);
}

.timeline-item h3 {
    margin: 8px 0 6px;
    color: var(--deep);
    font-size: 20px;
}

.timeline-item p {
    margin: 0 0 12px;
    color: var(--muted);
}

.text-link {
    color: var(--primary);
    font-weight: 700;
}

.chapter-index {
    display: grid;
    gap: 28px;
    padding: 32px;
    border-radius: 32px;
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}

.chapter-list {
    display: grid;
    gap: 0;
}

.chapter-row {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 14px;
    padding: 18px 0;
    border-bottom: 1px solid var(--line);
}

.chapter-row:last-child {
    border-bottom: 0;
}

.chapter-row h3 {
    margin: 0 0 4px;
    color: var(--deep);
}

.chapter-row p {
    margin: 0 0 8px;
    color: var(--muted);
}

.scenario-story-grid {
    display: grid;
    gap: 18px;
    margin-top: 28px;
}

.scenario-card {
    min-height: 230px;
    padding: 26px;
    border-radius: 28px;
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: 0 14px 34px rgba(26,70,112,.07);
}

.scenario-card.featured {
    background: linear-gradient(145deg, rgba(70,139,223,.14), #ffffff 58%);
}

.scenario-card h3 {
    margin: 0 0 10px;
    color: var(--deep);
    font-size: 23px;
}

.scenario-card p {
    color: var(--muted);
    margin: 0 0 18px;
}

.risk-panel {
    padding: 30px;
    border-radius: 32px;
    background: linear-gradient(135deg, #eef7ff 0%, #ffffff 72%);
    border: 1px solid rgba(70,139,223,.18);
}

.risk-grid {
    display: grid;
    gap: 14px;
    margin-top: 24px;
}

.risk-item {
    padding: 18px;
    border-radius: 18px;
    background: rgba(255,255,255,.78);
    border: 1px solid rgba(70,139,223,.15);
}

.risk-item h3 {
    margin: 0 0 6px;
    color: var(--deep);
    font-size: 18px;
}

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

.faq-list {
    display: grid;
    gap: 14px;
    margin-top: 28px;
}

.faq-item {
    padding: 22px;
    border: 1px solid var(--line);
    border-radius: 22px;
    background: #fff;
}

.faq-item h2,
.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: 40px auto 88px;
    padding: 42px 24px;
    text-align: center;
    border-radius: 34px;
    background: radial-gradient(circle at top left, rgba(70,139,223,.24), transparent 34%), linear-gradient(145deg, #f1f8ff, #ffffff);
    border: 1px solid rgba(70,139,223,.18);
    box-shadow: var(--shadow);
}

.cta-section h2 {
    margin: 0 0 12px;
    color: var(--deep);
    font-size: clamp(26px, 7vw, 44px);
    line-height: 1.12;
    letter-spacing: -.035em;
}

.cta-section p {
    max-width: 680px;
    margin: 0 auto 24px;
    color: var(--muted);
}

.page-hero {
    width: min(1080px, calc(100% - 32px));
    margin: 0 auto;
    padding: 56px 0 34px;
}

.page-layout {
    width: min(1080px, calc(100% - 32px));
    margin: 0 auto 74px;
    display: grid;
    gap: 24px;
}

.article-card {
    padding: 26px;
    border: 1px solid var(--line);
    border-radius: 28px;
    background: #fff;
    box-shadow: var(--shadow);
}

.article-card h2 {
    margin: 0 0 12px;
    color: var(--deep);
    font-size: 26px;
    line-height: 1.18;
}

.article-card p {
    color: var(--muted);
    margin: 0 0 16px;
}

.article-card p:last-child {
    margin-bottom: 0;
}

.guide-list,
.check-list,
.step-list {
    display: grid;
    gap: 12px;
    margin: 18px 0 0;
    padding: 0;
    list-style: none;
}

.guide-list li,
.check-list li,
.step-list li {
    padding: 14px 16px;
    border-radius: 16px;
    background: var(--pale);
    border: 1px solid var(--line);
    color: #405976;
}

.side-note {
    padding: 24px;
    border-radius: 24px;
    background: linear-gradient(145deg, rgba(70,139,223,.12), #fff);
    border: 1px solid rgba(70,139,223,.18);
    color: var(--muted);
}

.side-note h2,
.side-note h3 {
    margin: 0 0 10px;
    color: var(--deep);
}

.download-block {
    margin-top: 24px;
}

.download-page-panel {
    display: grid;
    gap: 18px;
}

.site-footer {
    background: #10243d;
    color: rgba(255,255,255,.78);
    padding: 44px 0 24px;
}

.footer-inner {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
    display: grid;
    gap: 26px;
}

.footer-brand {
    color: #fff;
    font-weight: 800;
    font-size: 20px;
    margin-bottom: 8px;
}

.footer-inner p {
    margin: 0;
    max-width: 560px;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 12px 18px;
}

.footer-links a {
    color: rgba(255,255,255,.84);
}

.footer-bottom {
    width: min(1120px, calc(100% - 32px));
    margin: 30px auto 0;
    padding-top: 20px;
    border-top: 1px solid rgba(255,255,255,.12);
    color: rgba(255,255,255,.52);
    font-size: 13px;
}

@media (min-width: 720px) {
    .scenario-story-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .risk-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .download-page-panel {
        grid-template-columns: 1.1fr .9fr;
    }
}

@media (min-width: 900px) {
    .nav-toggle {
        display: none;
    }

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

    .site-nav a {
        padding: 9px 11px;
    }

    .magazine-hero {
        grid-template-columns: 1.05fr .95fr;
        padding-top: 78px;
    }

    .brand-statement {
        grid-template-columns: 1fr .86fr;
        padding: 62px 0;
    }

    .split-section {
        grid-template-columns: 1fr .92fr;
        padding: 38px;
    }

    .split-section.reverse .split-art {
        order: initial;
    }

    .story-timeline {
        grid-template-columns: 1fr 1fr;
        gap: 24px 36px;
    }

    .timeline-item:nth-child(even) {
        transform: translateY(42px);
    }

    .chapter-index {
        grid-template-columns: .8fr 1.2fr;
        padding: 42px;
    }

    .scenario-story-grid {
        grid-template-columns: 1.15fr .85fr .85fr;
    }

    .scenario-card.featured {
        grid-row: span 2;
    }

    .page-layout {
        grid-template-columns: minmax(0, 1fr) 320px;
        align-items: start;
    }

    .article-card {
        padding: 36px;
    }

    .side-note {
        position: sticky;
        top: 96px;
    }

    .footer-inner {
        grid-template-columns: 1fr auto;
        align-items: start;
    }
}

@media (min-width: 1120px) {
    .hero-copy h1 {
        font-size: 82px;
    }

    .section {
        padding: 92px 0;
    }
}