:root {
  --brand: rgb(70,139,223);
  --brand-dark: #1f5fa8;
  --ink: #11243a;
  --muted: #607086;
  --soft: #eef6ff;
  --soft-2: #f7fbff;
  --line: #dbe8f6;
  --card: rgba(255,255,255,0.92);
  --shadow: 0 18px 48px rgba(28, 85, 150, 0.10);
  --radius: 24px;
  --container: 1160px;
}

* { 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, #ffffff 0%, #f7fbff 46%, #ffffff 100%);
  line-height: 1.75;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
p { margin: 0 0 16px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255,255,255,0.86);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(219,232,246,0.8);
}
.header-inner {
  width: min(100% - 32px, var(--container));
  margin: 0 auto;
  min-height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}
.brand { display: inline-flex; align-items: center; gap: 12px; font-weight: 760; letter-spacing: .02em; }
.logo { width: 38px; height: 38px; object-fit: contain; }
.brand-text { font-size: 16px; }
.nav-toggle {
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  padding: 0 11px;
}
.nav-toggle span { height: 2px; background: var(--ink); border-radius: 2px; }
.site-nav {
  position: absolute;
  top: 70px;
  left: 16px;
  right: 16px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: var(--shadow);
  padding: 10px;
  display: none;
  flex-direction: column;
}
.site-nav.is-open { display: flex; }
.site-nav a { padding: 12px 14px; color: #314359; font-size: 14px; border-radius: 12px; }
.site-nav a:hover { background: var(--soft); color: var(--brand-dark); }

.container, .section-inner, .article-wrap {
  width: min(100% - 32px, var(--container));
  margin: 0 auto;
}
.section { padding: 72px 0; }
.eyebrow, .badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--brand-dark);
  background: rgba(70,139,223,0.10);
  border: 1px solid rgba(70,139,223,0.18);
  padding: 7px 12px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .04em;
}
.section-title { font-size: clamp(30px, 6vw, 58px); line-height: 1.08; letter-spacing: -0.05em; margin: 14px 0 18px; }
.section-lead { color: var(--muted); max-width: 780px; font-size: 16px; }

.magazine-hero {
  padding: 52px 0 48px;
  background:
    radial-gradient(circle at 88% 14%, rgba(70,139,223,0.18), transparent 28%),
    linear-gradient(180deg, #fff 0%, #f1f7ff 100%);
}
.hero-grid {
  width: min(100% - 32px, var(--container));
  margin: 0 auto;
  display: grid;
  gap: 36px;
  align-items: center;
}
.hero-copy h1 {
  font-size: clamp(40px, 10vw, 84px);
  line-height: .98;
  letter-spacing: -0.07em;
  margin: 18px 0 20px;
}
.hero-copy .lead { font-size: 17px; color: #405168; max-width: 690px; }
.hero-actions { margin: 28px 0 20px; display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 13px 24px;
  border-radius: 999px;
  background: var(--brand);
  color: #fff;
  font-weight: 760;
  box-shadow: 0 14px 28px rgba(70,139,223,0.24);
  border: 1px solid rgba(70,139,223,0.24);
  cursor: pointer;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.download-btn:hover { transform: translateY(-2px); background: var(--brand-dark); box-shadow: 0 18px 34px rgba(70,139,223,0.30); }
.security-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
.security-tags span { font-size: 13px; color: #2e4965; background: #fff; border: 1px solid var(--line); padding: 8px 12px; border-radius: 999px; }
.product-visual {
  position: relative;
  min-height: 520px;
  border-radius: 34px;
  background: linear-gradient(145deg, #edf6ff 0%, #ffffff 56%, #e9f4ff 100%);
  border: 1px solid rgba(70,139,223,0.16);
  box-shadow: var(--shadow);
  padding: 28px;
  overflow: hidden;
}
.product-visual::before { content: ""; position: absolute; inset: 38px 28px auto auto; width: 160px; height: 160px; background: rgba(70,139,223,0.13); border-radius: 50%; filter: blur(6px); }
.app-frame { width: min(72%, 315px); margin: 10px auto 0; position: relative; z-index: 2; filter: drop-shadow(0 34px 38px rgba(22,64,110,.16)); }
.floating-card {
  position: absolute;
  z-index: 3;
  width: min(240px, 64%);
  background: rgba(255,255,255,0.94);
  border: 1px solid rgba(219,232,246,0.96);
  border-radius: 22px;
  padding: 16px;
  box-shadow: 0 18px 38px rgba(27, 83, 145, .12);
}
.floating-card strong { display: block; font-size: 15px; margin-bottom: 4px; }
.floating-card span { color: var(--muted); font-size: 13px; }
.floating-card.card-a { left: 18px; top: 54px; }
.floating-card.card-b { right: 18px; top: 190px; }
.floating-card.card-c { left: 30px; bottom: 52px; }

.brand-statement {
  padding: 80px 0;
  background: #fff;
}
.statement-box {
  width: min(100% - 32px, var(--container));
  margin: 0 auto;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 44px 0;
  display: grid;
  gap: 26px;
}
.statement-quote { font-size: clamp(30px, 7vw, 68px); line-height: 1.04; letter-spacing: -0.06em; margin: 0; }
.statement-text { color: var(--muted); font-size: 17px; }
.statement-text strong { color: var(--ink); }

.story-timeline { position: relative; display: grid; gap: 18px; margin-top: 34px; }
.timeline-item {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 22px;
  box-shadow: 0 12px 30px rgba(28, 85, 150, 0.06);
}
.timeline-no { color: var(--brand); font-size: 13px; font-weight: 800; letter-spacing: .15em; }
.timeline-item h3 { margin: 8px 0 8px; font-size: 22px; }
.timeline-item p { color: var(--muted); }
.text-link { color: var(--brand-dark); font-weight: 760; display: inline-flex; align-items: center; gap: 4px; }
.text-link::after { content: "→"; }

.split-section { display: grid; gap: 24px; margin-top: 32px; }
.split-block {
  display: grid;
  gap: 22px;
  align-items: stretch;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 30px;
  padding: 26px;
  box-shadow: var(--shadow);
}
.split-copy h3 { font-size: clamp(28px, 6vw, 46px); line-height: 1.08; letter-spacing: -0.04em; margin: 10px 0 14px; }
.split-copy p { color: var(--muted); }
.info-panel {
  background: linear-gradient(145deg, #eef6ff 0%, #ffffff 100%);
  border: 1px solid rgba(70,139,223,0.16);
  border-radius: 24px;
  padding: 24px;
  display: grid;
  gap: 12px;
}
.info-row { display: flex; align-items: flex-start; gap: 12px; padding: 12px 0; border-bottom: 1px solid var(--line); }
.info-row:last-child { border-bottom: 0; }
.info-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--brand); margin-top: 9px; flex: 0 0 auto; }
.info-row strong { display: block; }
.info-row span { color: var(--muted); font-size: 14px; }

.chapter-index {
  display: grid;
  gap: 28px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 32px;
  padding: 28px;
  box-shadow: var(--shadow);
}
.chapter-heading h2 { font-size: clamp(34px, 7vw, 70px); line-height: 1; letter-spacing: -0.06em; margin: 14px 0; }
.chapter-heading p { color: var(--muted); }
.chapter-list { display: grid; gap: 0; }
.chapter-row {
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 14px;
  padding: 20px 0;
  border-top: 1px solid var(--line);
}
.chapter-row:first-child { border-top: 0; }
.chapter-num { color: var(--brand); font-weight: 850; letter-spacing: .08em; }
.chapter-row h3 { margin: 0 0 8px; font-size: 20px; }
.chapter-row p { margin: 0 0 8px; color: var(--muted); font-size: 15px; }

.scenario-story-grid { display: grid; gap: 18px; margin-top: 34px; }
.scenario-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 26px;
  padding: 24px;
  box-shadow: 0 12px 30px rgba(28, 85, 150, 0.06);
}
.scenario-card .scene-tag { color: var(--brand-dark); font-size: 13px; font-weight: 800; }
.scenario-card h3 { margin: 8px 0; font-size: 22px; }
.scenario-card p { color: var(--muted); }

.risk-panel {
  background: linear-gradient(135deg, #eef6ff 0%, #ffffff 72%);
  border: 1px solid rgba(70,139,223,0.16);
  border-radius: 34px;
  padding: 28px;
  box-shadow: var(--shadow);
}
.risk-grid { display: grid; gap: 16px; margin-top: 26px; }
.risk-item {
  background: rgba(255,255,255,0.85);
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 20px;
}
.risk-item strong { display: block; margin-bottom: 6px; }
.risk-item p { color: var(--muted); font-size: 15px; margin: 0; }

.faq-list { display: grid; gap: 14px; margin-top: 30px; }
.faq-item {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 22px;
  box-shadow: 0 10px 26px rgba(28, 85, 150, 0.05);
}
.faq-item h3 { margin: 0 0 8px; font-size: 19px; }
.faq-item p { color: var(--muted); margin: 0; }

.cta-section { padding: 76px 0 88px; }
.cta-box {
  width: min(100% - 32px, 980px);
  margin: 0 auto;
  text-align: center;
  background: linear-gradient(145deg, #edf6ff 0%, #ffffff 100%);
  border: 1px solid rgba(70,139,223,0.16);
  border-radius: 36px;
  padding: 42px 24px;
  box-shadow: var(--shadow);
}
.cta-box h2 { font-size: clamp(30px, 7vw, 58px); line-height: 1.08; letter-spacing: -0.05em; margin: 0 0 16px; }
.cta-box p { color: var(--muted); max-width: 680px; margin: 0 auto 24px; }

.page-hero { padding: 58px 0 34px; background: linear-gradient(180deg, #fff 0%, #f2f8ff 100%); }
.page-hero-grid { width: min(100% - 32px, var(--container)); margin: 0 auto; display: grid; gap: 22px; }
.page-hero h1 { font-size: clamp(36px, 9vw, 76px); line-height: 1.02; letter-spacing: -0.06em; margin: 18px 0; }
.page-summary { font-size: 17px; color: var(--muted); max-width: 780px; }
.article-layout { width: min(100% - 32px, var(--container)); margin: 0 auto; display: grid; gap: 24px; padding: 40px 0 80px; }
.article-main { display: grid; gap: 22px; }
.content-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 28px;
  padding: 26px;
  box-shadow: 0 12px 30px rgba(28, 85, 150, 0.06);
}
.content-card h2 { margin: 0 0 14px; font-size: 26px; letter-spacing: -0.02em; }
.content-card p { color: var(--muted); }
.content-card ul, .content-card ol { padding-left: 22px; color: var(--muted); margin: 0; }
.content-card li { margin: 8px 0; }
.side-note {
  background: linear-gradient(145deg, #eef6ff, #fff);
  border: 1px solid rgba(70,139,223,.16);
  border-radius: 26px;
  padding: 24px;
  align-self: start;
}
.side-note h2, .side-note h3 { margin-top: 0; }
.side-note p, .side-note li { color: var(--muted); }
.article-actions { padding-top: 4px; }
.step-list { display: grid; gap: 12px; }
.step-item { display: grid; grid-template-columns: 42px 1fr; gap: 14px; padding: 16px; background: var(--soft-2); border: 1px solid var(--line); border-radius: 20px; }
.step-item span { font-weight: 850; color: var(--brand); }
.check-list { display: grid; gap: 10px; }
.check-item { padding: 14px 16px; border-radius: 16px; border: 1px solid var(--line); background: #fff; color: var(--muted); }
.download-panel { text-align: center; background: linear-gradient(145deg, #eef6ff 0%, #ffffff 100%); }

.site-footer { background: #0f2034; color: #dce9f8; padding: 48px 0 24px; }
.footer-inner { width: min(100% - 32px, var(--container)); margin: 0 auto; display: grid; gap: 24px; }
.footer-logo { width: 42px; height: 42px; margin-bottom: 14px; }
.footer-brand p { color: #b7c6d8; max-width: 520px; }
.footer-links { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.footer-links a { color: #dce9f8; font-size: 14px; padding: 6px 0; }
.footer-bottom { width: min(100% - 32px, var(--container)); margin: 30px auto 0; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.14); display: flex; flex-direction: column; gap: 8px; color: #9fb3c9; font-size: 13px; }

@media (min-width: 700px) {
  .scenario-story-grid { grid-template-columns: repeat(2, 1fr); }
  .risk-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-links { grid-template-columns: repeat(3, 1fr); }
}

@media (min-width: 920px) {
  .nav-toggle { display: none; }
  .site-nav { position: static; display: flex; flex-direction: row; align-items: center; gap: 4px; border: 0; box-shadow: none; padding: 0; background: transparent; }
  .site-nav a { padding: 9px 12px; }
  .magazine-hero { padding: 78px 0 74px; }
  .hero-grid { grid-template-columns: minmax(0, 1.05fr) minmax(360px, .95fr); gap: 64px; }
  .statement-box { grid-template-columns: 1.1fr .9fr; align-items: center; padding: 64px 0; }
  .story-timeline { grid-template-columns: 1fr 1fr; gap: 26px 40px; }
  .timeline-item:nth-child(even) { transform: translateY(36px); }
  .split-block { grid-template-columns: .95fr 1.05fr; padding: 38px; }
  .split-block:nth-child(even) .split-copy { order: 2; }
  .chapter-index { grid-template-columns: .78fr 1.22fr; padding: 42px; }
  .scenario-story-grid { grid-template-columns: 1.2fr .8fr .8fr; }
  .scenario-card:first-child { grid-row: span 2; min-height: 360px; display: flex; flex-direction: column; justify-content: flex-end; }
  .article-layout { grid-template-columns: minmax(0, 1fr) 330px; gap: 34px; }
  .page-hero-grid { grid-template-columns: 1fr .35fr; align-items: end; }
  .footer-inner { grid-template-columns: 1fr 1fr; align-items: start; }
  .footer-bottom { flex-direction: row; justify-content: space-between; }
}

@media (min-width: 1180px) {
  .section { padding: 92px 0; }
  .product-visual { min-height: 620px; }
}