:root {
  --bg: #f2f4f7;
  --bg-strong: #e7ebf0;
  --surface: #ffffff;
  --surface-strong: #ffffff;
  --surface-dark: #0d2c4d;
  --ink: #15273b;
  --ink-soft: #56677a;
  --ink-muted: #7b8998;
  --accent: #0b4f8a;
  --accent-strong: #083963;
  --accent-soft: rgba(11, 79, 138, 0.08);
  --line: rgba(21, 39, 59, 0.12);
  --line-strong: rgba(11, 79, 138, 0.24);
  --shadow: 0 18px 42px rgba(21, 39, 59, 0.08);
  --shadow-soft: 0 10px 24px rgba(21, 39, 59, 0.05);
  --radius-xl: 22px;
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --content-width: min(1280px, calc(100vw - 48px));
  --header-height: 126px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Noto Sans SC", "Microsoft YaHei", Arial, sans-serif;
  color: var(--ink);
  background: linear-gradient(180deg, #f7f8fa 0%, #eef2f6 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background: url("assets/ppt-media/image2.jpeg") center top / cover no-repeat;
  opacity: 0.06;
  pointer-events: none;
  z-index: -2;
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  background: linear-gradient(180deg, rgba(247, 248, 250, 0.94), rgba(238, 242, 246, 0.96));
  pointer-events: none;
  z-index: -1;
}

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

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

p,
li {
  line-height: 1.75;
}

ul {
  margin: 0;
  padding-left: 1.2rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(247, 248, 250, 0.96);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid rgba(21, 39, 59, 0.08);
}

.top-contact-bar {
  background: var(--surface-dark);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.top-contact-shell {
  width: var(--content-width);
  margin: 0 auto;
  min-height: 42px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
}

.top-contact-items {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 24px;
}

.top-contact-link {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  color: rgba(255, 255, 255, 0.84);
  font-size: 0.88rem;
  letter-spacing: 0.01em;
}

.top-contact-link:hover {
  color: #ffffff;
}

.header-shell {
  width: var(--content-width);
  margin: 0 auto;
  min-height: 84px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 1.04rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.brand-mark {
  width: 12px;
  height: 12px;
  border-radius: 2px;
  background: var(--accent);
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 6px;
}

.site-nav a {
  padding: 11px 16px;
  border-radius: 6px;
  color: var(--ink-soft);
  font-size: 0.94rem;
  font-weight: 600;
  border: 1px solid transparent;
}

.site-nav a:hover,
.site-nav a.is-active {
  color: #ffffff;
  background: var(--accent);
  border-color: var(--accent);
}

main {
  padding-bottom: 72px;
}

.content-shell {
  width: var(--content-width);
  margin: 0 auto;
}

.hero {
  position: relative;
  overflow: clip;
  min-height: calc(100vh - 48px);
  display: grid;
  align-items: center;
  padding: 116px 0 72px;
}

.hero-backdrop {
  position: absolute;
  inset: 0;
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
}

.hero-backdrop {
  background-image:
    linear-gradient(100deg, rgba(10, 29, 47, 0.94) 12%, rgba(10, 29, 47, 0.78) 42%, rgba(10, 29, 47, 0.24) 100%),
    url("assets/ppt-media/image128.jpeg");
}

.hero-backdrop::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent, rgba(10, 29, 47, 0.22));
}

.hero-shell,
.ending-shell {
  position: relative;
  z-index: 1;
}

.hero-shell {
  display: grid;
  grid-template-columns: minmax(300px, 440px) minmax(420px, 1fr);
  align-items: center;
  gap: clamp(32px, 6vw, 92px);
}

.hero-copy {
  color: #f5fffd;
}

.hero-kicker,
.light-tag {
  margin: 0 0 18px;
  color: rgba(245, 255, 253, 0.76);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-size: 0.84rem;
}

.hero h1 {
  margin: 0;
  font-size: clamp(3rem, 6vw, 5.3rem);
  line-height: 1.08;
  letter-spacing: -0.03em;
}

.hero-divider {
  margin: 24px 0 12px;
  font-size: 2rem;
  color: rgba(255, 255, 255, 0.75);
}

.hero-slogan {
  margin: 0;
  font-size: clamp(1.8rem, 4vw, 3rem);
  line-height: 1.3;
  font-weight: 700;
}

.hero-visual {
  margin: 0;
  padding: 14px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.94);
  border: 1px solid rgba(21, 39, 59, 0.1);
  box-shadow: 0 28px 60px rgba(6, 18, 26, 0.24);
}

.hero-visual img {
  width: 100%;
  border-radius: 10px;
}

.surface-section {
  padding: 88px 0 0;
}

.section-head,
.chapter-banner {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
}

.section-head {
  margin-bottom: 32px;
}

.section-head-simple {
  margin-bottom: 36px;
}

.section-tag {
  margin: 0 0 10px;
  color: var(--accent-strong);
  font-size: 0.84rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-weight: 700;
}

.section-head h2,
.chapter-banner h2,
.value-panel h2 {
  margin: 0;
  font-size: clamp(2rem, 3.8vw, 3rem);
  line-height: 1.18;
  letter-spacing: -0.02em;
}

.section-head-note,
.chapter-banner p,
.ending-summary {
  max-width: 620px;
  margin: 0;
  color: var(--ink-soft);
}

.chapter-banner {
  margin-bottom: 34px;
  padding: 24px 28px;
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, #ffffff, #f5f7fa);
  border: 1px solid rgba(21, 39, 59, 0.1);
  border-left: 5px solid var(--accent);
  box-shadow: var(--shadow-soft);
}

.chapter-number {
  flex: 0 0 auto;
  margin: 0;
  font-size: clamp(4rem, 10vw, 6.4rem);
  line-height: 0.88;
  font-weight: 800;
  color: rgba(11, 79, 138, 0.12);
}

.contents-grid,
.feature-grid,
.quad-grid,
.value-grid,
.matrix-grid,
.comparison-grid,
.special-grid {
  display: grid;
  gap: 20px;
}

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

.contents-card,
.panel {
  position: relative;
  overflow: clip;
  border-radius: var(--radius-lg);
  background: #ffffff;
  border: 1px solid rgba(21, 39, 59, 0.1);
  box-shadow: var(--shadow-soft);
}

.contents-card {
  padding: 28px 24px;
  min-height: 230px;
}

.contents-card::before,
.panel::before {
  content: "";
  position: absolute;
  inset: 0 auto auto 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), rgba(11, 79, 138, 0));
}

.contents-index {
  margin: 0 0 20px;
  font-size: 2.6rem;
  line-height: 1;
  color: var(--accent);
  font-weight: 800;
}

.contents-card h3,
.panel h3,
.panel h4,
.value-card h3 {
  margin: 0;
}

.contents-card h3 {
  margin-bottom: 12px;
  font-size: 1.35rem;
}

.contents-card p:last-child {
  margin: 0;
  color: var(--ink-soft);
}

.stack-grid,
.scenario-stack {
  display: grid;
  gap: 24px;
}

.panel {
  padding: 30px;
}

.panel-wide {
  padding: 34px;
}

.panel-title-group {
  display: flex;
  gap: 18px;
  align-items: start;
  margin-bottom: 22px;
}

.panel-index {
  margin: 0;
  min-width: 48px;
  color: var(--accent-strong);
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: 0.08em;
}

.panel-subtitle {
  margin: 8px 0 0;
  color: var(--ink-soft);
}

.lead-paragraph {
  margin-top: 0;
}

.feature-rows,
.policy-block,
.stats-grid,
.product-detail-grid,
.mode-grid,
.two-column-grid,
.issue-grid {
  display: grid;
  gap: 18px;
}

.feature-row,
.mode-card,
.issue-card,
.mini-card,
.comparison-card,
.value-card,
.special-card,
.product-tile,
.stat-chip {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: #ffffff;
}

.feature-row,
.mode-card,
.issue-card,
.mini-card,
.comparison-card,
.value-card,
.special-card,
.product-tile {
  padding: 20px;
}

.feature-row h4,
.mode-card h4,
.issue-card h4,
.mini-card h4,
.special-card h4 {
  margin-bottom: 10px;
}

.policy-block {
  margin: 20px 0;
  padding: 22px;
  border-radius: var(--radius-lg);
  background: rgba(11, 79, 138, 0.05);
  border: 1px solid rgba(11, 79, 138, 0.14);
}

.policy-title {
  margin: 0;
  font-weight: 700;
}

.bullet-list {
  display: grid;
  gap: 10px;
  color: var(--ink-soft);
}

.compact-list li {
  line-height: 1.7;
}

.two-column-grid,
.mode-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

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

.quad-grid,
.feature-grid,
.special-grid,
.value-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.mission-panel,
.platform-panel,
.product-hero-panel,
.scenario-panel {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.9fr);
  align-items: center;
  gap: 28px;
}

.mission-panel,
.platform-panel {
  padding: 34px;
}

.mission-title {
  margin-bottom: 8px;
  font-size: 1.12rem;
  font-weight: 700;
}

.mission-copy p:last-child,
.product-hero-copy p:last-child {
  margin-bottom: 0;
}

.mission-visual,
.platform-visual,
.product-hero-visual,
.scenario-visual {
  margin: 0;
  border-radius: calc(var(--radius-xl) - 6px);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
}

.mission-visual img,
.platform-visual img,
.product-hero-visual img,
.scenario-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.platform-panel {
  background: linear-gradient(180deg, #ffffff, #f4f7fa);
}

.platform-visual {
  min-height: 360px;
}

.matrix-panel,
.value-panel {
  padding: 34px;
}

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

.product-tile h4 {
  margin-bottom: 18px;
}

.spec-list {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 12px;
}

.spec-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 12px;
  border-bottom: 1px dashed rgba(16, 36, 48, 0.12);
}

.spec-list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.spec-list span {
  color: var(--ink-soft);
}

.product-hero-panel {
  padding: 0;
  grid-template-columns: minmax(280px, 0.82fr) minmax(420px, 1.18fr);
}

.product-hero-copy {
  padding: 34px 34px 34px 36px;
}

.product-hero-visual {
  height: 100%;
  min-height: 340px;
  border-radius: 0;
  box-shadow: none;
}

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

.product-detail-card {
  display: grid;
  gap: 24px;
}

.product-card-head {
  display: flex;
  gap: 12px;
}

.product-card-head h3 {
  margin-bottom: 8px;
}

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

.stat-chip {
  display: grid;
  gap: 10px;
  align-content: start;
  padding: 18px;
}

.stat-chip img {
  width: 30px;
  height: 30px;
}

.stat-chip strong {
  font-size: 1.3rem;
  line-height: 1.2;
}

.stat-chip span {
  color: var(--ink-soft);
}

.comparison-grid {
  margin-top: 24px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.comparison-card p {
  margin: 8px 0 0;
  color: var(--ink-soft);
}

.scenario-stack {
  gap: 26px;
}

.scenario-panel {
  grid-template-columns: minmax(320px, 0.9fr) minmax(0, 1.1fr);
  padding: 0;
}

.scenario-copy {
  padding: 32px;
}

.scenario-visual {
  min-height: 100%;
  border-radius: 0;
  box-shadow: none;
}

.scenario-visual img {
  min-height: 100%;
}

.special-grid {
  margin-top: 24px;
}

.special-card {
  display: grid;
  gap: 14px;
}

.special-card img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: 14px;
}

.value-panel {
  background: linear-gradient(180deg, #ffffff, #f4f7fa);
}

.value-grid {
  margin-top: 24px;
}

.value-card p {
  margin-bottom: 0;
  color: var(--ink-soft);
}

.ending {
  padding: 72px 0 0;
}

.ending-panel {
  position: relative;
  overflow: clip;
  padding: 40px;
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, #ffffff, #f4f7fa);
  border: 1px solid rgba(21, 39, 59, 0.1);
  box-shadow: var(--shadow-soft);
}

.ending-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(11, 79, 138, 0.04), transparent 28%),
    radial-gradient(circle at top right, rgba(11, 79, 138, 0.08), transparent 28%);
  pointer-events: none;
}

.ending-copy {
  position: relative;
  z-index: 1;
  max-width: 860px;
  color: var(--ink);
}

.ending h2 {
  margin: 0;
  font-size: clamp(2.2rem, 4.8vw, 3.4rem);
  line-height: 1.14;
  letter-spacing: -0.03em;
}

.ending-summary {
  max-width: 760px;
  margin: 20px 0 0;
  color: var(--ink-soft);
}

.ending-title {
  margin: 18px 0 0;
  color: var(--ink);
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1.55;
}

.ending-pills {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.ending-pill {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  padding: 10px 16px;
  border-radius: 6px;
  background: rgba(11, 79, 138, 0.08);
  border: 1px solid rgba(11, 79, 138, 0.18);
  color: var(--accent-strong);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

[id] {
  scroll-margin-top: calc(var(--header-height) + 28px);
}

@media (max-width: 1200px) {
  .contents-grid,
  .matrix-grid,
  .quad-grid,
  .feature-grid,
  .comparison-grid,
  .special-grid,
  .value-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero-shell,
  .mission-panel,
  .platform-panel,
  .product-hero-panel,
  .scenario-panel {
    grid-template-columns: 1fr;
  }

  .product-detail-grid,
  .two-column-grid,
  .mode-grid,
  .issue-grid {
    grid-template-columns: 1fr;
  }

  .platform-visual,
  .product-hero-visual {
    min-height: 320px;
  }
}

@media (max-width: 900px) {
  :root {
    --content-width: min(100vw - 28px, 1280px);
    --header-height: 150px;
  }

  .site-header {
    background: rgba(247, 248, 250, 0.98);
  }

  .header-shell {
    align-items: start;
    padding: 16px 0;
  }

  .top-contact-shell {
    min-height: 52px;
    justify-content: flex-start;
  }

  .site-nav {
    justify-content: flex-start;
  }

  .hero {
    min-height: auto;
    padding-top: 88px;
  }

  .ending {
    padding-top: 56px;
  }

  .chapter-banner {
    padding: 24px;
  }

  .chapter-number {
    font-size: 3.4rem;
  }

  .contents-grid,
  .matrix-grid,
  .quad-grid,
  .feature-grid,
  .comparison-grid,
  .special-grid,
  .value-grid,
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .panel,
  .panel-wide,
  .mission-panel,
  .platform-panel,
  .matrix-panel,
  .value-panel,
  .scenario-copy,
  .product-hero-copy {
    padding: 24px;
  }

  .section-head,
  .chapter-banner {
    align-items: start;
    flex-direction: column;
  }
}

@media (max-width: 640px) {
  .header-shell {
    gap: 16px;
  }

  .top-contact-items {
    gap: 4px 18px;
  }

  .brand {
    font-size: 0.94rem;
  }

  .site-nav a {
    padding: 8px 10px;
    font-size: 0.88rem;
  }

  .hero h1,
  .ending h2 {
    font-size: 2.5rem;
  }

  .hero-slogan {
    font-size: 1.8rem;
  }

  .ending-panel {
    padding: 28px 24px;
  }

  .contents-card {
    min-height: auto;
  }

  .panel-title-group {
    flex-direction: column;
    gap: 8px;
    margin-bottom: 18px;
  }

  .panel-index {
    min-width: 0;
  }
}