* {
  box-sizing: border-box;
}

:root {
  --primary: rgb(70,139,223);
  --primary-dark: #1d4f8f;
  --ink: #14213d;
  --muted: #66748a;
  --line: #dbe7f6;
  --soft: #f4f8fd;
  --soft-blue: #eaf4ff;
  --paper: #ffffff;
  --shadow: 0 20px 50px rgba(42, 99, 165, .11);
  --radius-lg: 26px;
  --radius-md: 18px;
  --container: 1160px;
}

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, #f8fbff 0%, #ffffff 34%, #f4f8fd 100%);
  line-height: 1.75;
  overflow-x: hidden;
}

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

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

p {
  margin: 0 0 16px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, .86);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(219, 231, 246, .9);
}

.nav-shell {
  width: min(100% - 32px, var(--container));
  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: 800;
  letter-spacing: .02em;
}

.brand-logo {
  width: 36px;
  height: 36px;
  object-fit: contain;
}

.brand-name {
  font-size: 18px;
}

.nav-toggle {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  color: var(--ink);
  padding: 9px 14px;
  font-size: 14px;
}

.site-nav {
  display: none;
  position: absolute;
  left: 16px;
  right: 16px;
  top: 74px;
  padding: 16px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: var(--shadow);
}

.site-nav.is-open {
  display: grid;
  gap: 10px;
}

.site-nav a {
  padding: 10px 12px;
  border-radius: 14px;
  color: var(--muted);
  font-weight: 600;
}

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

.content-container,
.section,
.page-hero,
.magazine-hero,
.brand-statement,
.story-timeline,
.chapter-index,
.scenario-story-grid,
.risk-panel,
.cta-section,
.faq-preview,
.split-section,
.guide-layout,
.download-panel,
.about-grid {
  width: min(100% - 32px, var(--container));
  margin: 0 auto;
}

.section {
  padding: 54px 0;
}

.eyebrow,
.chapter-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  width: fit-content;
  margin-bottom: 18px;
  color: var(--primary-dark);
  background: rgba(70,139,223,.1);
  border: 1px solid rgba(70,139,223,.18);
  border-radius: 999px;
  padding: 7px 12px;
  font-size: 13px;
  font-weight: 700;
}

.magazine-hero {
  padding: 54px 0 42px;
  display: grid;
  gap: 38px;
  align-items: center;
}

.hero-copy h1,
.page-hero h1 {
  margin: 0 0 20px;
  font-size: clamp(38px, 10vw, 76px);
  line-height: 1.02;
  letter-spacing: -.06em;
  color: #10213f;
}

.page-hero h1 {
  font-size: clamp(34px, 8vw, 62px);
}

.hero-copy p,
.page-hero p,
.section-lead {
  color: var(--muted);
  font-size: 17px;
  max-width: 720px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin: 28px 0 22px;
}

.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;
  letter-spacing: .03em;
  box-shadow: 0 14px 26px rgba(70,139,223,.22);
  transition: transform .2s ease, box-shadow .2s ease;
}

.download-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 20px 36px rgba(70,139,223,.28);
}

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

.security-tags li {
  border: 1px solid var(--line);
  background: rgba(255,255,255,.76);
  padding: 8px 12px;
  border-radius: 999px;
  color: #476078;
  font-size: 13px;
}

.product-visual {
  position: relative;
  min-height: 520px;
  border-radius: 34px;
  background: radial-gradient(circle at 22% 18%, rgba(70,139,223,.26), transparent 34%), linear-gradient(145deg, #eef7ff 0%, #ffffff 60%, #eaf4ff 100%);
  border: 1px solid #dceafa;
  overflow: hidden;
  box-shadow: var(--shadow);
  display: grid;
  place-items: center;
  padding: 38px 20px;
}

.product-visual .app-img {
  width: min(250px, 74%);
  margin: 0 auto;
  filter: drop-shadow(0 28px 45px rgba(23,68,118,.2));
}

.float-card {
  position: absolute;
  width: min(210px, 58%);
  padding: 14px 16px;
  border-radius: 20px;
  background: rgba(255,255,255,.9);
  border: 1px solid rgba(219,231,246,.96);
  box-shadow: 0 18px 45px rgba(25,73,128,.12);
}

.float-card strong {
  display: block;
  font-size: 14px;
  margin-bottom: 4px;
}

.float-card span {
  display: block;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.5;
}

.float-card.status {
  top: 22px;
  left: 18px;
}

.float-card.backup {
  right: 16px;
  bottom: 110px;
}

.float-card.asset {
  left: 24px;
  bottom: 24px;
}

.brand-statement {
  padding: 48px 0 32px;
}

.statement-box {
  border-radius: 34px;
  padding: 34px 24px;
  background: linear-gradient(135deg, #ffffff 0%, #edf6ff 100%);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.statement-quote {
  font-size: clamp(26px, 6vw, 48px);
  line-height: 1.18;
  letter-spacing: -.04em;
  margin: 0 0 24px;
  color: #10213f;
  font-weight: 800;
}

.statement-text {
  color: var(--muted);
  max-width: 830px;
}

.section-title {
  margin: 0 0 18px;
  font-size: clamp(28px, 7vw, 54px);
  line-height: 1.12;
  letter-spacing: -.04em;
}

.story-timeline {
  padding: 64px 0;
}

.timeline-list {
  display: grid;
  gap: 18px;
  margin-top: 30px;
}

.timeline-item {
  position: relative;
  padding: 22px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: 0 16px 36px rgba(41,88,138,.08);
}

.timeline-num,
.chapter-num {
  color: var(--primary);
  font-weight: 900;
  letter-spacing: .1em;
}

.timeline-item h3,
.chapter-item h3,
.scenario-card h3,
.risk-item h3,
.capability-copy h3 {
  margin: 8px 0 10px;
  font-size: 22px;
  line-height: 1.25;
}

.timeline-item p,
.chapter-item p,
.scenario-card p,
.risk-item p,
.capability-copy p,
.guide-card p,
.faq-item p {
  color: var(--muted);
}

.text-link {
  color: var(--primary-dark);
  font-weight: 800;
  border-bottom: 1px solid rgba(70,139,223,.35);
}

.split-section {
  display: grid;
  gap: 24px;
  padding: 62px 0;
}

.capability-block {
  display: grid;
  gap: 22px;
  align-items: center;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 32px;
  padding: 24px;
  box-shadow: var(--shadow);
}

.info-panel {
  border-radius: 26px;
  background: linear-gradient(160deg, #edf7ff, #ffffff);
  border: 1px solid #d7e8f8;
  padding: 22px;
}

.metric-line {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid #dbe7f6;
}

.metric-line:last-child {
  border-bottom: none;
}

.metric-line span {
  color: var(--muted);
}

.metric-line strong {
  color: var(--primary-dark);
}

.chapter-index {
  padding: 64px 0;
  display: grid;
  gap: 28px;
}

.chapter-list {
  display: grid;
  gap: 14px;
}

.chapter-item {
  display: grid;
  gap: 8px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.chapter-item:last-child {
  border-bottom: 1px solid var(--line);
}

.scenario-story-grid {
  padding: 62px 0;
}

.scenario-grid {
  display: grid;
  gap: 16px;
  margin-top: 30px;
}

.scenario-card {
  min-height: 230px;
  padding: 24px;
  border-radius: 28px;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: 0 12px 28px rgba(40,86,142,.07);
}

.scenario-card.featured {
  background: linear-gradient(135deg, #f0f8ff, #ffffff);
}

.risk-panel {
  margin-top: 40px;
  margin-bottom: 40px;
  padding: 34px 22px;
  border-radius: 34px;
  background: linear-gradient(140deg, #edf6ff, #ffffff 58%, #f7fbff);
  border: 1px solid #d8e9fa;
}

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

.risk-item {
  background: rgba(255,255,255,.82);
  border: 1px solid rgba(219,231,246,.9);
  border-radius: 22px;
  padding: 20px;
}

.faq-preview {
  padding: 62px 0;
}

.faq-list {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.faq-item {
  padding: 20px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 22px;
}

.faq-item h3 {
  margin: 0 0 8px;
  font-size: 18px;
}

.cta-section {
  margin-top: 28px;
  margin-bottom: 72px;
  padding: 42px 24px;
  text-align: center;
  border-radius: 34px;
  background: linear-gradient(135deg, #eaf4ff, #fff 65%);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.cta-section h2 {
  margin: 0 0 12px;
  font-size: clamp(28px, 7vw, 52px);
  line-height: 1.15;
  letter-spacing: -.04em;
}

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

.page-hero {
  padding: 58px 0 34px;
}

.guide-layout {
  display: grid;
  gap: 26px;
  padding: 22px 0 70px;
}

.guide-main,
.guide-aside,
.download-card,
.about-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 28px;
  box-shadow: 0 16px 38px rgba(42, 99, 165, .08);
}

.guide-main {
  padding: 26px;
}

.guide-main h2,
.download-card h2,
.about-card h2 {
  margin: 26px 0 12px;
  font-size: 26px;
  line-height: 1.25;
}

.guide-card {
  padding: 18px;
  border-radius: 22px;
  background: var(--soft);
  border: 1px solid var(--line);
  margin: 18px 0;
}

.step-list {
  display: grid;
  gap: 14px;
  padding: 0;
  margin: 22px 0;
  list-style: none;
}

.step-list li {
  padding: 18px;
  border-radius: 20px;
  background: linear-gradient(135deg, #f6fbff, #ffffff);
  border: 1px solid var(--line);
}

.check-list {
  padding-left: 20px;
  color: var(--muted);
}

.check-list li {
  margin: 8px 0;
}

.guide-aside {
  padding: 22px;
  height: fit-content;
}

.guide-aside a {
  display: block;
  padding: 12px 0;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
}

.guide-aside a:hover {
  color: var(--primary);
}

.download-panel {
  padding: 28px 0 70px;
}

.download-card {
  padding: 28px;
}

.download-steps {
  display: grid;
  gap: 14px;
  padding: 0;
  margin: 24px 0;
  list-style: none;
  counter-reset: dl;
}

.download-steps li {
  counter-increment: dl;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: #f8fbff;
}

.download-steps li::before {
  content: counter(dl, decimal-leading-zero);
  display: block;
  color: var(--primary);
  font-weight: 900;
  margin-bottom: 6px;
}

.about-grid {
  display: grid;
  gap: 18px;
  padding: 28px 0 70px;
}

.about-card {
  padding: 24px;
}

.footer-inner {
  width: min(100% - 32px, var(--container));
  margin: 0 auto;
  display: grid;
  gap: 28px;
  padding: 46px 0 32px;
  border-top: 1px solid var(--line);
}

.footer-logo {
  width: 42px;
  height: 42px;
  margin-bottom: 14px;
}

.footer-brand p {
  max-width: 460px;
  color: var(--muted);
}

.footer-links {
  display: grid;
  gap: 20px;
}

.footer-links strong {
  display: block;
  margin-bottom: 10px;
}

.footer-links a {
  display: block;
  color: var(--muted);
  padding: 4px 0;
}

.footer-links a:hover {
  color: var(--primary);
}

.footer-bottom {
  width: min(100% - 32px, var(--container));
  margin: 0 auto;
  padding: 18px 0 34px;
  color: var(--muted);
  font-size: 13px;
  border-top: 1px solid var(--line);
}

@media (min-width: 720px) {
  .scenario-grid,
  .risk-grid,
  .about-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-links {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 920px) {
  .nav-toggle {
    display: none;
  }

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

  .magazine-hero {
    min-height: calc(100vh - 110px);
    grid-template-columns: 1.04fr .96fr;
    padding-top: 72px;
  }

  .statement-box {
    padding: 56px;
  }

  .timeline-list {
    grid-template-columns: 1fr 1fr;
    gap: 22px 36px;
  }

  .timeline-item:nth-child(even) {
    transform: translateY(34px);
  }

  .capability-block {
    grid-template-columns: 1fr 1fr;
    padding: 34px;
  }

  .capability-block:nth-child(even) .capability-copy {
    order: 2;
  }

  .chapter-index {
    grid-template-columns: .72fr 1.28fr;
    align-items: start;
    gap: 64px;
  }

  .chapter-item {
    grid-template-columns: 92px 1fr 120px;
    align-items: center;
  }

  .scenario-grid {
    grid-template-columns: 1.25fr .85fr .85fr;
  }

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

  .risk-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .faq-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .guide-main {
    padding: 38px;
  }

  .download-card {
    padding: 46px;
  }

  .download-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .about-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .about-card.wide {
    grid-column: span 2;
  }

  .footer-inner {
    grid-template-columns: 1fr 1.2fr;
  }
}

@media (max-width: 420px) {
  .content-container,
  .section,
  .page-hero,
  .magazine-hero,
  .brand-statement,
  .story-timeline,
  .chapter-index,
  .scenario-story-grid,
  .risk-panel,
  .cta-section,
  .faq-preview,
  .split-section,
  .guide-layout,
  .download-panel,
  .about-grid {
    width: min(100% - 24px, var(--container));
  }

  .product-visual {
    min-height: 470px;
  }

  .float-card {
    width: 180px;
  }

  .download-btn {
    width: 100%;
  }
}