:root {
  --primary: #4a3af8;
  --accent: #42f0e1;
  --page: #11092a;
  --surface: #391287;
  --ink: #d7f4f1;
  --card-heading: #d7f4f1;
  --muted: rgba(215, 244, 241, 0.72);
  --line: rgba(215, 244, 241, 0.16);
  --surface-soft: rgba(57, 18, 135, 0.72);
  --danger: #e78018;
  --radius: 8px;
  --shadow: 0 18px 48px rgba(0, 0, 0, 0.36);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  padding-top: var(--topbar-height, 52px);
  background: var(--page);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
  letter-spacing: 0.01em;
  line-height: 1.65;
  overflow-x: hidden;
}

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

.topbar {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 10;
  background: rgba(17, 9, 42, 0.96);
  color: var(--ink);
  box-shadow: 0 1px 0 rgba(215, 244, 241, 0.14);
}

.topbar-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 10px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 0;
  min-width: 0;
}

.brand-title {
  font-size: 16px;
  font-weight: 800;
}

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

.nav a {
  padding: 6px 9px;
  border-radius: 6px;
  color: rgba(255, 255, 255, 0.82);
  font-size: 12px;
}

.nav a.active,
.nav a:hover {
  color: var(--ink);
  background: rgba(74, 58, 248, 0.34);
}

.hero {
  background:
    radial-gradient(circle at 16% 22%, rgba(66, 240, 225, 0.20), transparent 30%),
    radial-gradient(circle at 78% 8%, rgba(91, 19, 236, 0.26), transparent 32%),
    radial-gradient(circle at 70% 82%, rgba(231, 128, 24, 0.12), transparent 26%),
    linear-gradient(135deg, #11092a 0%, #1d075f 48%, #11092a 100%);
  color: var(--ink);
  border-bottom: 1px solid rgba(215, 244, 241, 0.14);
}

.hero-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 56px 24px 38px;
}

.eyebrow {
  color: var(--accent);
  font-size: 26px;
  font-weight: 700;
  letter-spacing: 0;
  margin: 0 0 12px;
}

h1,
h2,
h3 {
  line-height: 1.25;
  letter-spacing: 0;
}

h1 {
  max-width: 900px;
  margin: 0;
  font-size: 40px;
}

.lead {
  max-width: 820px;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 17px;
}

.overview-hero .lead + .lead {
  margin-top: 10px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0 16px;
  border-radius: 6px;
  font-weight: 700;
  font-size: 14px;
}

.button.primary {
  background: var(--accent);
  color: #11092a;
}

.button.secondary {
  border: 1px solid var(--line);
  background: rgba(91, 19, 236, 0.30);
  color: var(--ink);
}

.page {
  max-width: 1180px;
  margin: 0 auto;
  padding: 22px 16px 72px;
}

.doc-layout {
  display: grid;
  grid-template-columns: 176px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding-top: 30px;
}

.doc-sidebar {
  position: sticky;
  top: calc(var(--topbar-height, 52px) + 12px);
  max-height: calc(100vh - var(--topbar-height, 52px) - 24px);
  overflow: auto;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.24);
}

.doc-sidebar h2 {
  margin: 0;
  color: var(--ink);
  font-size: 16px;
}

.doc-sidebar p {
  margin: 4px 0 10px;
  color: var(--muted);
  font-size: 12px;
}

.doc-nav {
  display: grid;
  gap: 6px;
}

.doc-nav a {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 8px 10px;
  border-radius: 6px;
  border: 1px solid transparent;
  color: var(--ink);
}

.doc-nav a:hover,
.doc-nav a.active {
  background: rgba(66, 240, 225, 0.14);
  border-color: rgba(66, 240, 225, 0.32);
}

.doc-nav-index {
  min-width: 22px;
  color: var(--ink);
  font-size: 11px;
  font-weight: 700;
}

.doc-nav-label {
  font-size: 13px;
  line-height: 1.4;
}

.doc-content {
  min-width: 0;
}

.comparison-intro {
  margin-bottom: 16px;
}

.comparison-intro h2 {
  position: relative;
  display: inline-block;
  margin: 0;
  padding-left: 14px;
  font-size: 28px;
}

.comparison-intro h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.18em;
  bottom: 0.18em;
  width: 4px;
  border-radius: 999px;
  background: var(--accent);
}

.comparison-intro p {
  margin: 0;
  max-width: 820px;
  margin-top: 8px;
  color: var(--muted);
}

.pain-summary-section {
  padding: 0;
  border: 0;
  background: transparent;
  box-shadow: none;
}

.pain-summary-section .comparison-intro {
  margin-bottom: 16px;
}

.comparison-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #391287;
  box-shadow: 0 16px 42px rgba(0, 0, 0, 0.30);
}

.comparison-card + .comparison-card {
  margin-top: 22px;
}

.comparison-card-title {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 20px 22px;
  border-bottom: 1px solid var(--line);
  background: rgba(17, 9, 42, 0.88);
}

.comparison-card-title h3 {
  margin: 0;
  color: var(--card-heading);
  font-size: 20px;
}

.comparison-card-number {
  flex: 0 0 auto;
  display: block;
  color: var(--card-heading);
  font-size: 20px;
  font-weight: 800;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.overview-page .overview-hero h1 {
  font-size: 32px;
}

.overview-page .overview-hero .lead {
  font-size: 16px;
  line-height: 1.65;
}

.overview-page .comparison-intro h2 {
  font-size: 22px;
}

.overview-page .comparison-card-title h3 {
  font-size: 18px;
}

.overview-page .comparison-panel h4 {
  font-size: 15px;
}

.overview-page .comparison-panel li {
  font-size: 16px;
  line-height: 1.65;
}

.overview-page .doc-sidebar h2 {
  margin-bottom: 10px;
  font-size: 15px;
}

.overview-page .doc-nav-label {
  font-size: 12px;
}

.overview-content-section {
  padding: 0;
  border: 0;
  background: transparent;
  box-shadow: none;
}

.process-list {
  display: grid;
  gap: 12px;
}

.process-step-card {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  align-items: start;
  gap: 14px;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.24);
}

.process-step-number {
  padding-top: 2px;
  color: var(--card-heading);
  font-size: 20px;
  font-weight: 800;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.process-step-copy h3 {
  margin: 0;
  color: var(--card-heading);
  font-size: 17px;
}

.process-step-copy p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.65;
}

.role-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.role-card {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.24);
}

.role-card h3 {
  margin: 0;
  color: var(--card-heading);
  font-size: 17px;
}

.role-card p {
  margin: 9px 0 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.65;
}

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

.comparison-panel {
  min-width: 0;
  padding: 22px;
}

.comparison-panel + .comparison-panel {
  border-left: 1px solid var(--line);
}

.comparison-panel h4 {
  margin: 0 0 12px;
  font-size: 16px;
}

.comparison-panel ul {
  margin: 0;
  padding-left: 20px;
}

.comparison-panel li {
  color: var(--muted);
}

.comparison-panel li + li {
  margin-top: 9px;
}

.comparison-traditional {
  background: rgba(17, 9, 42, 0.64);
}

.comparison-traditional h4 {
  color: var(--muted);
}

.comparison-solution {
  background: rgba(57, 18, 135, 0.66);
}

.comparison-solution h4 {
  color: rgba(66, 240, 225, 0.86);
}

.doc-content > .section:first-child {
  margin-top: 0;
}

body[class="overview-page"] .comparison-card,
body[class="overview-page"] .process-step-card,
body[class="overview-page"] .role-card {
  background:
    linear-gradient(180deg, var(--surface) 0%, #1d075f 58%, #11092a 100%);
}

body[class="overview-page"] .comparison-solution {
  background:
    linear-gradient(180deg, rgba(57, 18, 135, 0.74), rgba(29, 7, 95, 0.74));
}

.section {
  margin-top: 30px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(180deg, rgba(17, 9, 42, 0.92), rgba(29, 7, 95, 0.82));
  box-shadow: 0 16px 42px rgba(0, 0, 0, 0.30);
  scroll-margin-top: 104px;
}

.section-header {
  margin-bottom: 16px;
}

.section-header h2 {
  position: relative;
  display: inline-block;
  margin: 0;
  padding-left: 14px;
  font-size: 26px;
}

.section-header h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.18em;
  bottom: 0.18em;
  width: 4px;
  border-radius: 999px;
  background: var(--accent);
}

.section-header p {
  max-width: 820px;
  margin: 8px 0 0;
  color: var(--muted);
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

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

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

.card {
  background:
    linear-gradient(180deg, var(--surface), var(--surface-soft));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.24);
}

.card h3 {
  margin: 0 0 8px;
  color: var(--card-heading);
  font-size: 18px;
}

.card p {
  margin: 0;
  color: var(--muted);
}

.doc-content strong {
  color: rgba(215, 244, 241, 0.94);
}

.rule-copy {
  color: var(--muted);
}

.rule-copy p {
  margin: 0;
}

.rule-copy p + p {
  margin-top: 12px;
}

.rule-feature-card {
  margin-top: 22px;
  overflow: hidden;
  border: 1px solid rgba(66, 240, 225, 0.34);
  border-radius: var(--radius);
  background:
    linear-gradient(180deg, rgba(57, 18, 135, 0.96), rgba(29, 7, 95, 0.88));
  box-shadow: 0 16px 42px rgba(0, 0, 0, 0.30);
}

.rule-feature-card-head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px 20px;
  border-bottom: 1px solid rgba(66, 240, 225, 0.22);
  background: rgba(17, 9, 42, 0.68);
}

.rule-feature-card-head h3 {
  margin: 0;
  color: var(--card-heading);
  font-size: 20px;
}

.rule-feature-card > .rule-copy {
  padding: 18px 20px;
}

.rule-feature-subgrid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid rgba(215, 244, 241, 0.12);
}

.rule-feature-panel {
  padding: 18px 20px;
}

.rule-feature-panel + .rule-feature-panel {
  border-left: 1px solid rgba(215, 244, 241, 0.12);
}

.rule-feature-panel h4 {
  margin: 0 0 10px;
  color: var(--card-heading);
  font-size: 17px;
}

.rule-feature-panel p {
  margin: 0;
  color: var(--muted);
}

.rule-feature-panel p + p {
  margin-top: 12px;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 0 9px;
  border-radius: 999px;
  background: rgba(66, 240, 225, 0.14);
  color: var(--ink);
  font-size: 12px;
  font-weight: 700;
}

.tag.orange {
  background: rgba(231, 128, 24, 0.18);
  color: var(--danger);
}

.tag.green {
  background: rgba(66, 240, 225, 0.18);
  color: var(--accent);
}

.feature-band {
  margin-top: 20px;
  padding: 22px;
  background:
    linear-gradient(135deg, rgba(17, 9, 42, 0.94), rgba(29, 7, 95, 0.86));
  border: 1px solid rgba(66, 240, 225, 0.32);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.flow {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 10px;
  margin-top: 16px;
}

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

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

.flow-step {
  position: relative;
  padding: 14px;
  min-height: 88px;
  background: rgba(91, 19, 236, 0.78);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.flow-step::after {
  content: "";
  position: absolute;
  top: 50%;
  right: -9px;
  width: 8px;
  height: 2px;
  background: var(--accent);
}

.flow-step:last-child::after {
  display: none;
}

.flow-step b {
  display: block;
  margin-bottom: 4px;
  color: var(--card-heading);
}

.flow-step span {
  color: var(--muted);
  font-size: 13px;
}

.chapter-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.chapter-link {
  display: block;
  min-height: 128px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(180deg, var(--surface), var(--surface-soft));
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.chapter-link:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.chapter-link h3 {
  margin: 0 0 8px;
  color: var(--card-heading);
}

.chapter-link p {
  margin: 0;
  color: var(--muted);
}

.note-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 14px;
}

.note {
  padding: 14px;
  background: rgba(231, 128, 24, 0.12);
  border: 1px solid rgba(231, 128, 24, 0.30);
  border-radius: var(--radius);
}

.note b {
  display: block;
  margin-bottom: 4px;
}

.note p {
  margin: 0;
  color: var(--muted);
}

.accordion-list {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.accordion-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(180deg, var(--surface), var(--surface-soft));
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.24);
}

.accordion-card summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 18px 18px 16px;
  cursor: pointer;
  list-style: none;
}

.accordion-card summary::-webkit-details-marker {
  display: none;
}

.accordion-summary-main {
  min-width: 0;
}

.accordion-kicker {
  display: block;
  margin-bottom: 4px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
}

.accordion-title {
  display: block;
  color: var(--card-heading);
  font-size: 17px;
  font-weight: 800;
  line-height: 1.3;
}

.accordion-meta {
  flex-shrink: 0;
  color: var(--muted);
  font-size: 12px;
}

.accordion-card summary::after {
  content: "⌄";
  flex-shrink: 0;
  color: var(--accent);
  font-size: 22px;
  line-height: 1;
  transform: translateY(-1px);
  transition: transform 0.18s ease;
}

.accordion-card[open] summary::after {
  transform: rotate(180deg) translateY(1px);
}

.accordion-body {
  padding: 0 18px 18px;
  color: var(--muted);
}

.accordion-body p {
  margin: 12px 0 0;
}

.accordion-body p:first-child {
  margin-top: 0;
}

@media (max-width: 980px) {
  .page {
    padding: 18px 16px 72px;
  }

  .comparison-grid {
    grid-template-columns: 1fr;
  }

  .comparison-panel + .comparison-panel {
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .rule-feature-subgrid {
    grid-template-columns: 1fr;
  }

  .rule-feature-panel + .rule-feature-panel {
    border-top: 1px solid rgba(215, 244, 241, 0.12);
    border-left: 0;
  }

  .role-grid {
    grid-template-columns: 1fr;
  }

  .accordion-card summary {
    align-items: flex-start;
  }
}

.compare {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  align-items: stretch;
}

.compare-card {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--surface), var(--surface-soft));
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.24);
}

.compare-card h3 {
  margin: 0 0 8px;
  color: var(--card-heading);
}

.compare-card ul,
.compact-list {
  margin: 10px 0 0;
  padding-left: 18px;
  color: var(--muted);
}

.compact-list li + li,
.compare-card li + li {
  margin-top: 5px;
}

.footer {
  margin-top: 50px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}