:root {
    --primary: rgb(70,139,223);
    --primary-dark: #236bbd;
    --primary-soft: #eaf4ff;
    --ink: #0d1b2e;
    --muted: #5f6f85;
    --line: rgba(19, 52, 88, 0.12);
    --panel: #ffffff;
    --soft-bg: #f6f9fd;
    --blue-gray: #eff6ff;
    --radius: 22px;
    --shadow: 0 24px 70px rgba(32, 82, 135, 0.10);
}
* {
    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, #f7fbff 0%, #ffffff 28%, #f8fbff 100%);
    line-height: 1.75;
    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, 0.88);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(18px);
}
.header-inner {
    width: min(1180px, calc(100% - 36px));
    margin: 0 auto;
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}
.brand,
.footer-brand {
    display: flex;
    align-items: center;
    gap: 12px;
}
.brand-logo,
.footer-logo {
    width: 38px;
    height: 38px;
    object-fit: contain;
}
.brand-text {
    font-size: 19px;
    font-weight: 760;
    letter-spacing: 0.08em;
}
.nav-toggle {
    width: 44px;
    height: 44px;
    border: 1px solid var(--line);
    border-radius: 14px;
    background: #fff;
    display: grid;
    place-content: center;
    gap: 5px;
}
.nav-toggle span {
    width: 18px;
    height: 2px;
    background: var(--ink);
    display: block;
    border-radius: 999px;
}
.site-nav {
    position: absolute;
    left: 18px;
    right: 18px;
    top: 76px;
    display: none;
    flex-direction: column;
    padding: 16px;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: #fff;
    box-shadow: var(--shadow);
}
.site-nav.open {
    display: flex;
}
.site-nav a {
    padding: 12px 10px;
    color: #334256;
    font-size: 15px;
}
.site-nav a.active,
.site-nav a:hover {
    color: var(--primary);
}
main {
    display: block;
}
.container,
.section,
.page-hero,
.article-layout,
.footer-inner,
.footer-bottom {
    width: min(1180px, calc(100% - 36px));
    margin-left: auto;
    margin-right: auto;
}
.section {
    padding: 64px 0;
}
.section-kicker,
.section-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary-dark);
    background: rgba(70,139,223,0.10);
    border: 1px solid rgba(70,139,223,0.16);
    border-radius: 999px;
    padding: 6px 12px;
    font-size: 13px;
    font-weight: 680;
    letter-spacing: 0.04em;
}
h1,
h2,
h3 {
    line-height: 1.16;
    letter-spacing: -0.035em;
    margin: 0;
}
p {
    margin: 0;
    color: var(--muted);
}
.lead {
    font-size: 17px;
    color: #43546b;
}
.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 50px;
    padding: 0 24px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    font-weight: 720;
    font-size: 15px;
    box-shadow: 0 16px 35px rgba(70,139,223,0.25);
    transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
    cursor: pointer;
}
.download-btn:hover {
    transform: translateY(-2px);
    background: var(--primary-dark);
    box-shadow: 0 20px 45px rgba(70,139,223,0.32);
}
.text-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--primary-dark);
    font-weight: 700;
}
.text-link::after {
    content: "↗";
    font-size: 12px;
}
.magazine-hero {
    width: min(1180px, calc(100% - 36px));
    margin: 0 auto;
    padding: 66px 0 42px;
    display: grid;
    gap: 36px;
    align-items: center;
}
.hero-copy {
    display: grid;
    gap: 22px;
}
.hero-copy h1 {
    font-size: clamp(38px, 10vw, 86px);
    letter-spacing: -0.07em;
}
.hero-copy .lead {
    max-width: 650px;
}
.hero-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}
.hero-tags span {
    padding: 9px 12px;
    border: 1px solid var(--line);
    background: #fff;
    border-radius: 999px;
    color: #34506e;
    font-size: 13px;
    box-shadow: 0 10px 28px rgba(33, 72, 110, 0.05);
}
.product-visual {
    position: relative;
    padding: 26px;
    min-height: 520px;
    border-radius: 34px;
    background:
        radial-gradient(circle at 80% 12%, rgba(70,139,223,.28), transparent 34%),
        linear-gradient(135deg, #f7fbff, #eaf4ff 60%, #ffffff);
    border: 1px solid rgba(70,139,223,0.18);
    box-shadow: var(--shadow);
    overflow: hidden;
}
.product-visual::before {
    content: "";
    position: absolute;
    inset: 12px;
    border: 1px solid rgba(255,255,255,0.72);
    border-radius: 28px;
    pointer-events: none;
}
.product-phone {
    width: min(285px, 72%);
    margin: 34px auto 0;
    filter: drop-shadow(0 36px 42px rgba(25, 67, 111, 0.20));
}
.float-card {
    position: absolute;
    width: min(236px, 70%);
    padding: 14px 16px;
    border-radius: 18px;
    background: rgba(255,255,255,0.86);
    border: 1px solid rgba(70,139,223,0.15);
    box-shadow: 0 18px 46px rgba(32, 82, 135, 0.13);
    backdrop-filter: blur(16px);
}
.float-card strong {
    display: block;
    margin-bottom: 4px;
    color: #14253d;
    font-size: 14px;
}
.float-card span {
    display: block;
    color: #62738b;
    font-size: 12px;
    line-height: 1.5;
}
.float-card.status { left: 18px; top: 30px; }
.float-card.backup { right: 18px; top: 174px; }
.float-card.asset { left: 34px; bottom: 34px; }
.brand-statement {
    width: min(1180px, calc(100% - 36px));
    margin: 28px auto 0;
    padding: 42px 22px;
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    display: grid;
    gap: 22px;
}
.statement-quote {
    font-size: clamp(28px, 7vw, 58px);
    color: var(--ink);
    font-weight: 760;
    line-height: 1.08;
    letter-spacing: -0.06em;
}
.statement-text {
    display: grid;
    gap: 14px;
    max-width: 820px;
}
.split-section {
    display: grid;
    gap: 24px;
    align-items: stretch;
}
.split-copy,
.split-panel {
    border-radius: var(--radius);
}
.split-copy {
    display: grid;
    align-content: center;
    gap: 18px;
}
.split-copy h2,
.section-title {
    font-size: clamp(30px, 7vw, 54px);
}
.split-panel {
    padding: 28px;
    background: linear-gradient(145deg, #f8fbff, #eaf4ff);
    border: 1px solid rgba(70,139,223,0.16);
    box-shadow: var(--shadow);
}
.panel-list {
    display: grid;
    gap: 14px;
}
.panel-row {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 14px;
    align-items: start;
    padding: 16px;
    background: rgba(255,255,255,.78);
    border: 1px solid rgba(70,139,223,0.13);
    border-radius: 18px;
}
.panel-row b {
    display: grid;
    place-items: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    font-size: 12px;
}
.panel-row strong {
    display: block;
    margin-bottom: 3px;
}
.story-timeline {
    position: relative;
    display: grid;
    gap: 18px;
    margin-top: 30px;
}
.timeline-item {
    display: grid;
    gap: 10px;
    padding: 22px;
    border: 1px solid var(--line);
    border-radius: 22px;
    background: #fff;
    box-shadow: 0 16px 45px rgba(39, 76, 114, 0.07);
}
.timeline-num {
    color: var(--primary);
    font-size: 13px;
    font-weight: 800;
    letter-spacing: 0.12em;
}
.timeline-item h3 {
    font-size: 22px;
}
.chapter-index {
    display: grid;
    gap: 28px;
    padding: 34px 22px;
    border-radius: 30px;
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: var(--shadow);
}
.chapter-heading {
    display: grid;
    gap: 14px;
}
.chapter-list {
    display: grid;
    gap: 0;
    border-top: 1px solid var(--line);
}
.chapter-item {
    display: grid;
    gap: 8px;
    padding: 20px 0;
    border-bottom: 1px solid var(--line);
}
.chapter-item .num {
    color: var(--primary);
    font-weight: 820;
    letter-spacing: 0.08em;
    font-size: 13px;
}
.chapter-item h3 {
    font-size: 23px;
}
.scenario-story-grid {
    display: grid;
    gap: 18px;
    margin-top: 26px;
}
.scenario-card {
    display: grid;
    gap: 13px;
    padding: 24px;
    min-height: 210px;
    align-content: space-between;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 24px;
    box-shadow: 0 14px 40px rgba(39, 76, 114, 0.07);
}
.scenario-card.featured {
    background: linear-gradient(145deg, #ffffff, #eef6ff);
}
.risk-panel {
    padding: 28px 20px;
    border-radius: 30px;
    background: linear-gradient(145deg, #edf6ff, #f8fbff);
    border: 1px solid rgba(70,139,223,0.18);
}
.risk-list {
    display: grid;
    gap: 14px;
    margin-top: 26px;
}
.risk-item {
    padding: 18px;
    border-radius: 20px;
    background: rgba(255,255,255,0.76);
    border: 1px solid rgba(70,139,223,0.14);
}
.risk-item strong {
    display: block;
    margin-bottom: 6px;
}
.faq-list {
    display: grid;
    gap: 14px;
    margin-top: 26px;
}
.faq-item {
    padding: 20px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 20px;
}
.faq-item h3 {
    font-size: 19px;
    margin-bottom: 8px;
    letter-spacing: -0.02em;
}
.cta-section {
    text-align: center;
    display: grid;
    justify-items: center;
    gap: 18px;
    padding: 48px 20px;
    border-radius: 32px;
    background:
        radial-gradient(circle at 50% 0%, rgba(70,139,223,0.18), transparent 40%),
        linear-gradient(180deg, #ffffff, #eef6ff);
    border: 1px solid rgba(70,139,223,0.17);
}
.cta-section h2 {
    font-size: clamp(30px, 7vw, 54px);
}
.page-hero {
    padding: 62px 0 28px;
    display: grid;
    gap: 18px;
}
.page-hero h1 {
    max-width: 910px;
    font-size: clamp(36px, 9vw, 72px);
}
.page-summary {
    max-width: 790px;
    font-size: 17px;
}
.article-layout {
    display: grid;
    gap: 28px;
    padding: 24px 0 70px;
}
.article-body {
    display: grid;
    gap: 22px;
}
.article-body h2 {
    font-size: clamp(25px, 5vw, 36px);
    margin-top: 8px;
}
.article-body p {
    font-size: 16px;
}
.info-card,
.note-panel,
.checklist,
.step-list,
.principle-list {
    padding: 22px;
    border-radius: 24px;
    background: #fff;
    border: 1px solid var(--line);
    box-shadow: 0 16px 45px rgba(39, 76, 114, 0.07);
}
.note-panel {
    align-self: start;
    position: relative;
}
.note-panel h3,
.checklist h3,
.info-card h3 {
    font-size: 21px;
    margin-bottom: 12px;
}
.note-panel ul,
.checklist ul,
.step-list ol,
.principle-list ul {
    margin: 0;
    padding-left: 20px;
    color: #4e6077;
}
.note-panel li,
.checklist li,
.step-list li,
.principle-list li {
    margin: 8px 0;
}
.step-list {
    counter-reset: step;
}
.step-list ol {
    display: grid;
    gap: 12px;
}
.soft-band {
    padding: 24px;
    border-radius: 24px;
    background: linear-gradient(145deg, #f7fbff, #eaf4ff);
    border: 1px solid rgba(70,139,223,0.16);
}
.two-column {
    display: grid;
    gap: 18px;
}
.download-steps {
    display: grid;
    gap: 14px;
    margin-top: 20px;
}
.download-step {
    padding: 18px;
    border-radius: 20px;
    background: #fff;
    border: 1px solid var(--line);
}
.site-footer {
    border-top: 1px solid var(--line);
    background: #fff;
}
.footer-inner {
    padding: 36px 0;
    display: grid;
    gap: 24px;
}
.footer-brand p {
    max-width: 520px;
    margin-top: 6px;
    font-size: 14px;
}
.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 12px 20px;
}
.footer-links a {
    color: #4b607a;
    font-size: 14px;
}
.footer-links a:hover {
    color: var(--primary);
}
.footer-bottom {
    padding: 18px 0 30px;
    border-top: 1px solid var(--line);
}
.footer-bottom p {
    font-size: 13px;
}
@media (min-width: 720px) {
    .section {
        padding: 82px 0;
    }
    .magazine-hero,
    .split-section,
    .two-column {
        grid-template-columns: 1fr 1fr;
    }
    .chapter-item {
        grid-template-columns: 78px 1fr auto;
        align-items: center;
    }
    .scenario-story-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .scenario-card.featured {
        grid-column: span 2;
    }
    .risk-list,
    .faq-list {
        grid-template-columns: repeat(2, 1fr);
    }
    .footer-inner {
        grid-template-columns: 1.2fr auto;
        align-items: center;
    }
}
@media (min-width: 980px) {
    .nav-toggle {
        display: none;
    }
    .site-nav {
        position: static;
        display: flex;
        flex-direction: row;
        align-items: center;
        padding: 0;
        border: 0;
        border-radius: 0;
        background: transparent;
        box-shadow: none;
    }
    .site-nav a {
        padding: 10px 12px;
    }
    .magazine-hero {
        grid-template-columns: 1.05fr .95fr;
        padding-top: 96px;
    }
    .brand-statement {
        grid-template-columns: 1.05fr .95fr;
        padding: 70px 0;
    }
    .split-section {
        grid-template-columns: 0.9fr 1.1fr;
        gap: 58px;
    }
    .story-timeline {
        grid-template-columns: 1fr 1fr;
        gap: 26px 66px;
    }
    .story-timeline::before {
        content: "";
        position: absolute;
        top: 0;
        bottom: 0;
        left: 50%;
        width: 1px;
        background: var(--line);
    }
    .timeline-item:nth-child(even) {
        transform: translateY(46px);
    }
    .chapter-index {
        grid-template-columns: 0.78fr 1.22fr;
        padding: 50px;
    }
    .scenario-story-grid {
        grid-template-columns: 1.1fr .9fr .9fr;
    }
    .scenario-card.featured {
        grid-row: span 2;
        grid-column: auto;
    }
    .risk-panel {
        padding: 50px;
    }
    .risk-list {
        grid-template-columns: repeat(3, 1fr);
    }
    .article-layout {
        grid-template-columns: minmax(0, 1fr) 320px;
        gap: 54px;
    }
    .article-body {
        max-width: 780px;
    }
}
@media (max-width: 420px) {
    .container,
    .section,
    .page-hero,
    .article-layout,
    .footer-inner,
    .footer-bottom,
    .magazine-hero,
    .brand-statement {
        width: min(100% - 28px, 1180px);
    }
    .download-btn {
        width: 100%;
    }
    .product-visual {
        min-height: 480px;
        padding: 18px;
    }
    .float-card {
        width: 74%;
        padding: 12px;
    }
    .float-card.status { left: 12px; top: 20px; }
    .float-card.backup { right: 12px; top: 158px; }
    .float-card.asset { left: 20px; bottom: 24px; }
}