:root {
  --bg: #f4efe7;
  --bg-strong: #ffffff;
  --panel: rgba(255, 252, 247, 0.92);
  --hero-panel: linear-gradient(135deg, rgba(255, 255, 255, 0.86), rgba(255, 248, 240, 0.92));
  --hero-overlay: linear-gradient(90deg, rgba(13, 122, 103, 0.08), rgba(212, 111, 47, 0.08));
  --controls-bg: rgba(244, 239, 231, 0.78);
  --hero-glow-a: rgba(13, 122, 103, 0.18);
  --hero-glow-b: rgba(212, 111, 47, 0.14);
  --surface-tint: rgba(255, 255, 255, 0.72);
  --intro-panel: linear-gradient(180deg, rgba(255, 255, 255, 0.88), rgba(255, 252, 247, 0.82));
  --table-bg: rgba(255, 255, 255, 0.82);
  --ink: #14221d;
  --body-copy: #24352f;
  --muted: #5b6c64;
  --border: rgba(20, 34, 29, 0.12);
  --border-strong: rgba(20, 34, 29, 0.2);
  --accent: #0d7a67;
  --accent-strong: #065f51;
  --accent-soft: rgba(13, 122, 103, 0.12);
  --warm: #d46f2f;
  --mark-bg: rgba(255, 208, 94, 0.45);
  --shadow: 0 18px 48px rgba(20, 34, 29, 0.08);
  --radius-lg: 24px;
  --radius-md: 16px;
  --content-width: 840px;
  --toc-width: 320px;
  --site-width: 1440px;
  --font-sans: "Segoe UI", "Trebuchet MS", "Helvetica Neue", sans-serif;
  --font-serif: Georgia, "Times New Roman", serif;
}

body[data-theme="dark"] {
  --bg: #161616;
  --bg-strong: #1c1c1c;
  --panel: rgba(24, 24, 24, 0.94);
  --hero-panel: linear-gradient(135deg, rgba(34, 34, 34, 0.96), rgba(22, 22, 22, 0.92));
  --hero-overlay: linear-gradient(90deg, rgba(111, 143, 194, 0.12), rgba(91, 119, 167, 0.12));
  --controls-bg: rgba(18, 18, 18, 0.82);
  --hero-glow-a: rgba(111, 143, 194, 0.18);
  --hero-glow-b: rgba(42, 58, 86, 0.28);
  --surface-tint: rgba(27, 27, 27, 0.84);
  --intro-panel: linear-gradient(180deg, rgba(32, 32, 32, 0.94), rgba(24, 24, 24, 0.9));
  --table-bg: rgba(28, 28, 28, 0.92);
  --ink: #e5e5e5;
  --body-copy: #d2d2d2;
  --muted: #a1a1aa;
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.16);
  --accent: #6f8fc2;
  --accent-strong: #b8cdf2;
  --accent-soft: rgba(111, 143, 194, 0.18);
  --warm: #7f8ebd;
  --mark-bg: rgba(111, 143, 194, 0.3);
  --shadow: 0 18px 48px rgba(0, 0, 0, 0.35);
}

body[data-theme="ocean"] {
  --bg: #001b2e;
  --bg-strong: #05101a;
  --panel: rgba(4, 19, 31, 0.95);
  --hero-panel: linear-gradient(135deg, rgba(5, 32, 52, 0.94), rgba(0, 27, 46, 0.94));
  --hero-overlay: linear-gradient(90deg, rgba(74, 179, 176, 0.14), rgba(29, 53, 87, 0.16));
  --controls-bg: rgba(4, 19, 31, 0.84);
  --hero-glow-a: rgba(74, 179, 176, 0.16);
  --hero-glow-b: rgba(29, 53, 87, 0.28);
  --surface-tint: rgba(10, 28, 39, 0.82);
  --intro-panel: linear-gradient(180deg, rgba(7, 27, 41, 0.94), rgba(4, 19, 31, 0.9));
  --table-bg: rgba(6, 22, 34, 0.94);
  --ink: #a8dadc;
  --body-copy: #c4e6e7;
  --muted: #7bb8ba;
  --border: rgba(168, 218, 220, 0.12);
  --border-strong: rgba(168, 218, 220, 0.22);
  --accent: #2f9c9a;
  --accent-strong: #a8dadc;
  --accent-soft: rgba(47, 156, 154, 0.18);
  --warm: #4ab3b0;
  --mark-bg: rgba(47, 156, 154, 0.34);
  --shadow: 0 18px 48px rgba(0, 8, 14, 0.42);
}

body[data-theme="pastel"] {
  --bg: #fdfcf0;
  --bg-strong: #fff9fb;
  --panel: rgba(255, 249, 251, 0.94);
  --hero-panel: linear-gradient(135deg, rgba(255, 250, 246, 0.96), rgba(255, 245, 250, 0.94));
  --hero-overlay: linear-gradient(90deg, rgba(255, 154, 162, 0.12), rgba(199, 124, 172, 0.12));
  --controls-bg: rgba(255, 249, 251, 0.8);
  --hero-glow-a: rgba(255, 154, 162, 0.16);
  --hero-glow-b: rgba(255, 218, 193, 0.22);
  --surface-tint: rgba(255, 252, 253, 0.86);
  --intro-panel: linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(255, 247, 251, 0.9));
  --table-bg: rgba(255, 252, 253, 0.9);
  --ink: #5d576b;
  --body-copy: #665f75;
  --muted: #8e7fa0;
  --border: rgba(142, 127, 160, 0.18);
  --border-strong: rgba(142, 127, 160, 0.26);
  --accent: #c77cac;
  --accent-strong: #8f5f95;
  --accent-soft: rgba(199, 124, 172, 0.16);
  --warm: #ff9aa2;
  --mark-bg: rgba(255, 154, 162, 0.32);
}

body[data-theme="high-contrast"] {
  --bg: #000000;
  --bg-strong: #111111;
  --panel: rgba(10, 10, 10, 0.96);
  --hero-panel: linear-gradient(135deg, rgba(17, 17, 17, 0.96), rgba(0, 0, 0, 0.96));
  --hero-overlay: linear-gradient(90deg, rgba(212, 184, 63, 0.12), rgba(255, 255, 0, 0.08));
  --controls-bg: rgba(0, 0, 0, 0.88);
  --hero-glow-a: rgba(212, 184, 63, 0.14);
  --hero-glow-b: rgba(255, 255, 0, 0.08);
  --surface-tint: rgba(17, 17, 17, 0.88);
  --intro-panel: linear-gradient(180deg, rgba(17, 17, 17, 0.96), rgba(10, 10, 10, 0.94));
  --table-bg: rgba(9, 9, 9, 0.94);
  --ink: #ffffff;
  --body-copy: #ffffff;
  --muted: #ffff00;
  --border: rgba(255, 255, 0, 0.24);
  --border-strong: rgba(255, 255, 0, 0.38);
  --accent: #d2b83f;
  --accent-strong: #ffff00;
  --accent-soft: rgba(212, 184, 63, 0.2);
  --warm: #ffff00;
  --mark-bg: rgba(255, 255, 0, 0.28);
  --shadow: 0 18px 48px rgba(0, 0, 0, 0.55);
}

body[data-theme="custom"] {
  --bg: #1a103d;
  --bg-strong: #241a4a;
  --panel: rgba(29, 18, 66, 0.95);
  --hero-panel: linear-gradient(135deg, rgba(46, 16, 101, 0.96), rgba(26, 16, 61, 0.94));
  --hero-overlay: linear-gradient(90deg, rgba(192, 132, 252, 0.14), rgba(109, 40, 217, 0.14));
  --controls-bg: rgba(26, 16, 61, 0.84);
  --hero-glow-a: rgba(192, 132, 252, 0.18);
  --hero-glow-b: rgba(109, 40, 217, 0.24);
  --surface-tint: rgba(37, 24, 80, 0.84);
  --intro-panel: linear-gradient(180deg, rgba(37, 24, 80, 0.96), rgba(26, 16, 61, 0.92));
  --table-bg: rgba(35, 24, 74, 0.92);
  --ink: #f3e8ff;
  --body-copy: #eadbff;
  --muted: #c084fc;
  --border: rgba(216, 180, 254, 0.14);
  --border-strong: rgba(216, 180, 254, 0.24);
  --accent: #6d28d9;
  --accent-strong: #d8b4fe;
  --accent-soft: rgba(192, 132, 252, 0.18);
  --warm: #c084fc;
  --mark-bg: rgba(192, 132, 252, 0.28);
  --shadow: 0 18px 48px rgba(9, 4, 25, 0.48);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: var(--font-sans);
  background:
    radial-gradient(circle at top left, var(--hero-glow-a), transparent 34%),
    radial-gradient(circle at top right, var(--hero-glow-b), transparent 24%),
    linear-gradient(180deg, var(--bg-strong) 0%, var(--bg) 100%);
}

body.toc-open {
  overflow: hidden;
}

a {
  color: var(--accent-strong);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.14em;
}

code {
  padding: 0.1rem 0.35rem;
  border-radius: 0.45rem;
  background: rgba(20, 34, 29, 0.08);
  font-family: "Consolas", "Courier New", monospace;
  font-size: 0.92em;
}

.page-shell {
  width: min(calc(100% - 2rem), var(--site-width));
  margin: 0 auto;
  padding: 2rem 0 3rem;
}

.hero {
  display: grid;
  gap: 1.5rem;
  padding: 2rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background:
    var(--hero-panel),
    var(--hero-overlay);
  box-shadow: var(--shadow);
}

.eyebrow,
.toc-kicker,
.search-label,
.stat-label {
  margin: 0;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.hero h1 {
  margin: 0.4rem 0 0.75rem;
  font-family: var(--font-serif);
  font-size: clamp(2.4rem, 5vw, 4.2rem);
  line-height: 0.96;
  letter-spacing: -0.04em;
}

.hero-summary {
  max-width: 60ch;
  margin: 0;
  color: var(--muted);
  font-size: 1.02rem;
  line-height: 1.7;
}

.hero-stats {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.stat-card {
  padding: 1rem 1.1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--surface-tint);
}

.stat-card strong {
  display: block;
  margin-top: 0.45rem;
  font-size: 1.15rem;
}

.controls-bar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  gap: 1rem;
  align-items: end;
  grid-template-columns: minmax(0, 1fr) minmax(220px, 280px) auto auto;
  margin: 1.4rem 0 1.2rem;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: 1.25rem;
  background: var(--controls-bg);
  backdrop-filter: blur(20px);
}

.search-field,
.theme-field {
  display: grid;
  gap: 0.45rem;
}

.search-field input,
.theme-field select {
  width: 100%;
  padding: 0.95rem 1rem;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: var(--bg-strong);
  color: var(--ink);
  font: inherit;
}

.search-field input:focus,
.theme-field select:focus,
.toc-toggle:focus {
  outline: 2px solid rgba(13, 122, 103, 0.28);
  outline-offset: 2px;
}

.theme-field select {
  cursor: pointer;
}

.toc-toggle {
  display: none;
  align-self: center;
  padding: 0.85rem 1rem;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: var(--bg-strong);
  color: var(--ink);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.search-status {
  min-width: 13rem;
  margin: 0;
  text-align: right;
  color: var(--muted);
  font-size: 0.95rem;
}

.layout {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: minmax(260px, var(--toc-width)) minmax(0, 1fr);
  align-items: start;
}

.toc-panel {
  position: sticky;
  top: 6.2rem;
}

.toc-card,
.content-panel {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.toc-card {
  overflow: hidden;
}

.toc-header {
  padding: 1.2rem 1.2rem 0.85rem;
  border-bottom: 1px solid var(--border);
}

.toc-header h2 {
  margin: 0.35rem 0 0;
  font-size: 1.1rem;
}

.toc-nav {
  max-height: calc(100vh - 9rem);
  overflow: auto;
  padding: 0.85rem;
  scrollbar-width: thin;
  scrollbar-color: color-mix(in srgb, var(--accent) 78%, var(--bg-strong)) color-mix(in srgb, var(--bg-strong) 88%, transparent);
}

.toc-nav::-webkit-scrollbar {
  width: 10px;
}

.toc-nav::-webkit-scrollbar-track {
  background: color-mix(in srgb, var(--bg-strong) 88%, transparent);
  border-radius: 999px;
}

.toc-nav::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--accent), var(--warm));
  border: 2px solid color-mix(in srgb, var(--bg-strong) 88%, transparent);
  border-radius: 999px;
}

.toc-nav::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, var(--accent-strong), var(--accent));
}

.toc-placeholder {
  margin: 0;
  color: var(--muted);
}

.toc-group {
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border);
}

.toc-group:last-child {
  border-bottom: 0;
}

.toc-group-title {
  display: block;
  margin-bottom: 0.55rem;
  color: var(--ink);
  font-size: 0.97rem;
  font-weight: 700;
  text-decoration: none;
}

.toc-list {
  display: grid;
  gap: 0.28rem;
  padding-left: 0.9rem;
}

.toc-link {
  display: inline-flex;
  align-items: center;
  min-height: 2rem;
  color: var(--muted);
  font-size: 0.93rem;
  line-height: 1.35;
  text-decoration: none;
}

.toc-link.is-active,
.toc-group-title.is-active,
.toc-link:hover,
.toc-group-title:hover {
  color: var(--accent-strong);
}

.toc-group.is-hidden {
  display: none;
}

.content-panel {
  padding: clamp(1.15rem, 3vw, 2rem);
}

.notice {
  margin-bottom: 1rem;
  padding: 0.95rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--surface-tint);
}

.notice-error {
  border-color: rgba(165, 33, 33, 0.2);
  background: rgba(255, 240, 240, 0.9);
}

.is-hidden {
  display: none !important;
}

.loading-state {
  display: grid;
  gap: 0.8rem;
  padding: 1rem 0;
  color: var(--muted);
}

.loading-bar {
  position: relative;
  overflow: hidden;
  height: 0.45rem;
  border-radius: 999px;
  background: rgba(20, 34, 29, 0.08);
}

.loading-bar::after {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 35%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), var(--warm));
  animation: load-slide 1.2s ease-in-out infinite;
}

@keyframes load-slide {
  0% {
    transform: translateX(-100%);
  }
  100% {
    transform: translateX(280%);
  }
}

.manual-content {
  max-width: var(--content-width);
}

.manual-intro,
.manual-top-section {
  margin-bottom: 1.5rem;
  padding: 1.4rem;
  border: 1px solid rgba(20, 34, 29, 0.08);
  border-radius: 18px;
  background: color-mix(in srgb, var(--surface-tint) 88%, transparent);
}

.manual-intro {
  background: var(--intro-panel);
}

.manual-top-section.is-hidden {
  display: none;
}

.manual-content h1,
.manual-content h2,
.manual-content h3 {
  scroll-margin-top: 7.5rem;
}

.manual-content h1 {
  margin: 0 0 0.9rem;
  font-family: var(--font-serif);
  font-size: clamp(2rem, 3vw, 2.8rem);
  line-height: 1.03;
  letter-spacing: -0.035em;
}

.manual-content h2 {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin: 0 0 1rem;
  font-size: clamp(1.4rem, 2vw, 1.75rem);
  line-height: 1.15;
}

.manual-content h3 {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 1.35rem 0 0.65rem;
  font-size: 1.08rem;
  line-height: 1.3;
}

.manual-content p,
.manual-content li {
  color: var(--body-copy);
  line-height: 1.72;
}

.manual-content p {
  margin: 0.7rem 0;
}

.manual-content ul,
.manual-content ol {
  margin: 0.7rem 0 1rem;
  padding-left: 1.35rem;
}

.manual-content li + li {
  margin-top: 0.35rem;
}

.manual-content hr {
  margin: 1.3rem 0;
  border: 0;
  border-top: 1px solid var(--border);
}

.manual-content table {
  width: 100%;
  margin: 1rem 0 1.2rem;
  border-collapse: collapse;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--table-bg);
}

.manual-content th,
.manual-content td {
  padding: 0.8rem 0.9rem;
  border: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

.manual-content th {
  background: rgba(13, 122, 103, 0.08);
  font-size: 0.93rem;
}

.manual-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 1rem 0 1.2rem;
}

.meta-pill {
  min-width: 12rem;
  padding: 0.9rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: linear-gradient(180deg, var(--accent-soft), var(--surface-tint));
}

.meta-pill strong {
  display: block;
  margin-bottom: 0.18rem;
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.heading-anchor {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.8rem;
  height: 1.8rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 0.95rem;
  font-weight: 700;
  text-decoration: none;
  opacity: 0;
  transform: translateY(2px);
  transition:
    opacity 140ms ease,
    transform 140ms ease,
    background-color 140ms ease;
}

.manual-content h2:hover .heading-anchor,
.manual-content h3:hover .heading-anchor,
.manual-content h2:focus-within .heading-anchor,
.manual-content h3:focus-within .heading-anchor {
  opacity: 1;
  transform: translateY(0);
}

.heading-anchor:hover {
  background: rgba(13, 122, 103, 0.2);
}

mark {
  padding: 0.05rem 0.15rem;
  border-radius: 0.28rem;
  background: var(--mark-bg);
}

@media (max-width: 1024px) {
  .controls-bar {
    grid-template-columns: minmax(0, 1fr) minmax(200px, 260px) auto;
  }

  .search-status {
    grid-column: 1 / -1;
    text-align: left;
  }

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

  .toc-toggle {
    display: inline-flex;
    justify-content: center;
  }

  .toc-panel {
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 40;
    width: min(92vw, 360px);
    padding: 1rem 0 1rem 1rem;
    transform: translateX(-105%);
    transition: transform 180ms ease;
  }

  body.toc-open .toc-panel {
    transform: translateX(0);
  }

  .toc-card {
    height: 100%;
  }

  .toc-nav {
    height: calc(100% - 84px);
    max-height: none;
  }

  body.toc-open::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: 30;
    background: rgba(20, 34, 29, 0.34);
  }
}

@media (max-width: 720px) {
  .page-shell {
    width: min(calc(100% - 1rem), var(--site-width));
    padding-top: 1rem;
  }

  .hero,
  .content-panel {
    padding: 1rem;
  }

  .controls-bar {
    padding: 0.85rem;
  }

  .manual-intro,
  .manual-top-section {
    padding: 1rem;
  }

  .manual-content table {
    display: block;
    overflow-x: auto;
  }
}