:root {
  --brand: rgb(70,139,223);
  --brand-deep: #1b4f8e;
  --ink: #112033;
  --muted: #60728a;
  --line: #dbe7f5;
  --soft: #f5f9ff;
  --soft-blue: #eaf4ff;
  --white: #ffffff;
  --radius-lg: 26px;
  --radius-md: 18px;
  --shadow: 0 18px 50px rgba(42, 87, 141, .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, #ffffff 0%, #f7fbff 42%, #ffffff 100%);
  line-height: 1.75;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
p { color: var(--muted); margin: 0 0 18px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(255,255,255,.88);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(219,231,245,.82);
}
.nav-wrap {
  max-width: 1180px;
  margin: 0 auto;
  padding: 14px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: -.02em; }
.logo { width: 38px; height: 38px; border-radius: 12px; object-fit: cover; }
.nav-toggle {
  border: 1px solid var(--line);
  background: var(--white);
  color: var(--ink);
  border-radius: 999px;
  padding: 9px 14px;
  font-weight: 700;
}
.site-nav {
  display: none;
  position: absolute;
  left: 18px;
  right: 18px;
  top: 66px;
  padding: 12px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: var(--shadow);
}
.site-nav.is-open { display: grid; gap: 4px; }
.site-nav a { padding: 12px 14px; border-radius: 14px; color: var(--muted); font-weight: 650; }
.site-nav a.active, .site-nav a:hover { background: var(--soft-blue); color: var(--brand-deep); }

.content-container, .section, .magazine-hero, .brand-statement, .chapter-index, .risk-panel, .cta-section, .page-hero, .article-shell, .download-layout, .faq-page {
  width: min(100% - 36px, 1180px);
  margin: 0 auto;
}
.section { padding: 68px 0; }
.section-head { margin-bottom: 28px; max-width: 760px; }
.kicker, .badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--brand-deep);
  background: var(--soft-blue);
  border: 1px solid rgba(70,139,223,.18);
  border-radius: 999px;
  padding: 8px 13px;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .04em;
}
h1, h2, h3 { margin: 0; line-height: 1.16; letter-spacing: -.04em; }
h1 { font-size: clamp(38px, 10vw, 74px); }
h2 { font-size: clamp(30px, 7vw, 52px); }
h3 { font-size: clamp(20px, 4vw, 28px); }
.lead { font-size: clamp(17px, 3.8vw, 20px); color: #40556e; }

.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0 26px;
  border-radius: 999px;
  background: var(--brand);
  color: var(--white);
  font-weight: 800;
  box-shadow: 0 14px 28px rgba(70,139,223,.28);
  transition: transform .2s ease, box-shadow .2s ease;
}
.download-btn:hover { transform: translateY(-2px); box-shadow: 0 18px 38px rgba(70,139,223,.34); }
.text-link { color: var(--brand-deep); font-weight: 800; border-bottom: 1px solid rgba(70,139,223,.32); }

.magazine-hero {
  padding: 58px 0 76px;
  display: grid;
  gap: 36px;
}
.hero-copy { display: grid; gap: 22px; align-content: center; }
.hero-copy h1 span { color: var(--brand); }
.safety-tags { display: flex; flex-wrap: wrap; gap: 10px; }
.safety-tags span {
  padding: 9px 13px;
  border-radius: 999px;
  background: rgba(255,255,255,.84);
  border: 1px solid var(--line);
  color: var(--brand-deep);
  font-size: 14px;
  font-weight: 750;
}
.product-visual {
  position: relative;
  min-height: 520px;
  padding: 28px;
  border-radius: 34px;
  background:
    radial-gradient(circle at 80% 15%, rgba(70,139,223,.30), transparent 32%),
    linear-gradient(145deg, #f1f7ff 0%, #ffffff 58%, #eaf4ff 100%);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.product-visual .app-shot {
  width: min(72%, 360px);
  margin: 26px auto 0;
  filter: drop-shadow(0 28px 45px rgba(24,57,96,.18));
  border-radius: 32px;
}
.float-card {
  position: relative;
  margin: 14px 0;
  padding: 15px 16px;
  border-radius: 18px;
  background: rgba(255,255,255,.86);
  border: 1px solid rgba(219,231,245,.9);
  box-shadow: 0 12px 38px rgba(42,87,141,.10);
  font-weight: 800;
  color: var(--ink);
}
.float-card small { display: block; color: var(--muted); font-weight: 650; margin-top: 3px; }

.brand-statement {
  padding: 48px 26px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  display: grid;
  gap: 24px;
}
.statement-quote {
  font-size: clamp(28px, 7vw, 54px);
  line-height: 1.12;
  letter-spacing: -.05em;
  color: var(--ink);
  max-width: 900px;
}
.statement-quote strong { color: var(--brand); }
.statement-copy { max-width: 760px; }

.story-timeline { position: relative; display: grid; gap: 18px; margin-top: 30px; }
.story-item {
  position: relative;
  padding: 24px;
  border-radius: var(--radius-lg);
  background: var(--white);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.story-num { color: var(--brand); font-weight: 900; letter-spacing: .1em; margin-bottom: 10px; }
.story-item h3 { margin-bottom: 10px; }

.split-section { display: grid; gap: 22px; margin-top: 26px; }
.split-block {
  display: grid;
  gap: 22px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 30px;
  background: rgba(255,255,255,.78);
  box-shadow: var(--shadow);
}
.info-panel {
  padding: 24px;
  border-radius: 24px;
  background: linear-gradient(145deg, #eaf4ff, #ffffff);
  border: 1px solid rgba(70,139,223,.16);
}
.info-panel ul, .check-list, .article-card ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 12px; }
.info-panel li, .check-list li, .article-card li {
  padding-left: 24px;
  position: relative;
  color: #40556e;
}
.info-panel li::before, .check-list li::before, .article-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--brand);
}

.chapter-index {
  padding: 34px;
  border-radius: 34px;
  background: #ffffff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  display: grid;
  gap: 28px;
}
.chapter-list { display: grid; gap: 0; }
.chapter-row {
  display: grid;
  gap: 10px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}
.chapter-row:last-child { border-bottom: 0; }
.chapter-row .num { color: var(--brand); font-weight: 900; letter-spacing: .12em; }
.chapter-row h3 { font-size: 22px; }

.scenario-story-grid { display: grid; gap: 18px; margin-top: 28px; }
.scenario-card {
  padding: 26px;
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, #ffffff, #f6faff);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.scenario-card.wide { background: linear-gradient(135deg, #eaf4ff, #ffffff 65%); }
.scenario-card h3 { margin-bottom: 10px; }

.risk-panel {
  padding: 34px 24px;
  border-radius: 34px;
  background: linear-gradient(140deg, #eaf4ff, #ffffff 72%);
  border: 1px solid rgba(70,139,223,.18);
}
.risk-grid { display: grid; gap: 16px; margin-top: 24px; }
.risk-item {
  padding: 20px;
  border-radius: 22px;
  background: rgba(255,255,255,.74);
  border: 1px solid rgba(219,231,245,.88);
}
.risk-item strong { display: block; margin-bottom: 6px; color: var(--ink); }

.faq-list { display: grid; gap: 14px; margin-top: 24px; }
.faq-item {
  padding: 22px;
  border-radius: 22px;
  background: var(--white);
  border: 1px solid var(--line);
}
.faq-item h3 { font-size: 20px; margin-bottom: 8px; }

.cta-section {
  margin-top: 32px;
  margin-bottom: 80px;
  padding: 48px 24px;
  border-radius: 36px;
  text-align: center;
  background: linear-gradient(145deg, #f0f7ff, #ffffff);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.cta-section p { max-width: 660px; margin: 18px auto 28px; }

.page-hero { padding: 58px 0 30px; display: grid; gap: 18px; }
.page-hero h1 { font-size: clamp(36px, 8vw, 64px); max-width: 920px; }
.page-hero .lead { max-width: 780px; }
.article-shell { display: grid; gap: 24px; padding: 24px 0 80px; }
.article-main {
  padding: 26px;
  border-radius: 30px;
  background: var(--white);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.article-main h2 { font-size: clamp(25px, 5vw, 38px); margin: 32px 0 14px; }
.article-main h2:first-child { margin-top: 0; }
.article-card, .side-card {
  padding: 22px;
  border-radius: 24px;
  background: var(--soft);
  border: 1px solid var(--line);
  margin: 20px 0;
}
.article-side { display: grid; gap: 16px; align-content: start; }
.side-card { margin: 0; background: linear-gradient(145deg, #ffffff, #f0f7ff); }
.side-card h3 { font-size: 20px; margin-bottom: 12px; }
.side-card a { display: block; color: var(--brand-deep); font-weight: 800; margin-top: 10px; }
.article-cta { margin-top: 28px; }

.download-layout {
  display: grid;
  gap: 24px;
  padding: 48px 0 90px;
}
.download-panel {
  padding: 34px;
  border-radius: 34px;
  background: linear-gradient(145deg, #ffffff, #edf6ff);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.steps { counter-reset: step; display: grid; gap: 14px; margin-top: 20px; }
.step {
  counter-increment: step;
  padding: 18px 18px 18px 58px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--white);
  position: relative;
}
.step::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 18px;
  top: 18px;
  color: var(--brand);
  font-weight: 900;
}

.faq-page { padding: 44px 0 90px; }
.faq-page .faq-item { margin-bottom: 14px; }
.site-footer { background: #f4f8fe; border-top: 1px solid var(--line); padding: 42px 18px 24px; }
.footer-grid { max-width: 1180px; margin: 0 auto; display: grid; gap: 28px; }
.footer-brand { font-size: 24px; font-weight: 900; margin-bottom: 10px; }
.site-footer h3 { font-size: 17px; margin-bottom: 12px; }
.site-footer a { display: block; color: var(--muted); margin: 8px 0; }
.footer-bottom { max-width: 1180px; margin: 28px auto 0; padding-top: 20px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }

@media (min-width: 760px) {
  .magazine-hero { grid-template-columns: 1.02fr .98fr; align-items: center; padding-top: 84px; }
  .brand-statement { grid-template-columns: 1.08fr .92fr; padding: 66px 0; }
  .story-timeline { grid-template-columns: repeat(2, 1fr); gap: 22px; }
  .story-item:nth-child(even) { transform: translateY(28px); }
  .split-block { grid-template-columns: 1fr 1fr; align-items: center; padding: 36px; }
  .split-block:nth-child(even) .info-panel { order: -1; }
  .chapter-index { grid-template-columns: .82fr 1.18fr; padding: 50px; }
  .chapter-row { grid-template-columns: 70px 1fr 120px; align-items: start; gap: 18px; }
  .scenario-story-grid { grid-template-columns: repeat(3, 1fr); }
  .scenario-card.wide { grid-column: span 2; }
  .risk-grid { grid-template-columns: repeat(2, 1fr); }
  .article-shell { grid-template-columns: minmax(0, 1fr) 310px; align-items: start; }
  .download-layout { grid-template-columns: 1fr 1fr; align-items: start; }
  .footer-grid { grid-template-columns: 1.5fr .8fr .8fr; }
}

@media (min-width: 980px) {
  .nav-toggle { display: none; }
  .site-nav {
    display: flex;
    position: static;
    padding: 0;
    background: transparent;
    border: 0;
    border-radius: 0;
    box-shadow: none;
    gap: 4px;
  }
  .site-nav a { padding: 9px 13px; }
  .section { padding: 88px 0; }
  .product-visual .float-card.status { position: absolute; top: 42px; left: 34px; width: 210px; }
  .product-visual .float-card.backup { position: absolute; right: 28px; top: 160px; width: 218px; }
  .product-visual .float-card.asset { position: absolute; left: 40px; bottom: 34px; width: 235px; }
  .product-visual .app-shot { margin-top: 88px; }
  .risk-grid { grid-template-columns: repeat(3, 1fr); }
}