:root {
  color-scheme: light;
  --bg: #f5f7fb;
  --surface: rgba(255, 255, 255, 0.94);
  --surface-strong: #ffffff;
  --surface-muted: #f4f6fb;
  --text: #162232;
  --text-soft: #5a6678;
  --line: rgba(26, 48, 78, 0.12);
  --accent: #ea6b24;
  --accent-strong: #cc5513;
  --accent-soft: rgba(234, 107, 36, 0.12);
  --secondary: #0f7c82;
  --secondary-soft: rgba(15, 124, 130, 0.12);
  --success: #13795b;
  --warn: #9b5d00;
  --info: #0f6cbd;
  --danger: #b42318;
  --shadow: 0 18px 48px rgba(16, 36, 61, 0.12);
  --radius-xl: 24px;
  --radius-lg: 18px;
  --radius-md: 14px;
  --radius-sm: 10px;
  --sidebar-width: 340px;
  --max-width: 1560px;
  --font-sans: "Segoe UI Variable Display", "Segoe UI", sans-serif;
  --font-heading: "Segoe UI Variable Display", "Segoe UI", sans-serif;
  --masthead-bg: #171827;
  --masthead-text: #f8fbff;
  --masthead-height: 72px;
}

body[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0f1720;
  --surface: rgba(18, 28, 40, 0.92);
  --surface-strong: #14202d;
  --surface-muted: #1b2b3b;
  --text: #f5f8fc;
  --text-soft: #b5c1d1;
  --line: rgba(191, 222, 255, 0.12);
  --accent: #ff9c63;
  --accent-strong: #ffb07f;
  --accent-soft: rgba(255, 156, 99, 0.18);
  --secondary: #5ad3d9;
  --secondary-soft: rgba(90, 211, 217, 0.14);
  --success: #58d5b2;
  --warn: #ffca72;
  --info: #78c3ff;
  --danger: #ff8f7d;
  --shadow: 0 20px 56px rgba(0, 0, 0, 0.34);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  padding-top: var(--masthead-height);
  background:
    radial-gradient(circle at top left, rgba(234, 107, 36, 0.12), transparent 24%),
    radial-gradient(circle at top right, rgba(15, 124, 130, 0.12), transparent 26%),
    linear-gradient(180deg, #fafcff 0%, var(--bg) 52%, #edf2f8 100%);
  color: var(--text);
  font-family: var(--font-sans);
  line-height: 1.65;
}

body[data-theme="dark"] {
  background:
    radial-gradient(circle at top left, rgba(255, 156, 99, 0.16), transparent 24%),
    radial-gradient(circle at top right, rgba(90, 211, 217, 0.12), transparent 24%),
    linear-gradient(180deg, #09111a 0%, var(--bg) 56%, #0d141d 100%);
}

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

a {
  color: inherit;
}

code {
  padding: 0.15rem 0.35rem;
  border-radius: 8px;
  background: var(--surface-muted);
  font-family: "Cascadia Code", "Consolas", monospace;
  font-size: 0.94em;
}

pre {
  margin: 0;
  padding: 1rem 1.1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--surface-muted);
  overflow: auto;
}

pre code {
  padding: 0;
  background: transparent;
  font-size: 0.92rem;
  line-height: 1.55;
}

.progress-bar {
  position: fixed;
  inset: 0 0 auto;
  z-index: 90;
  height: 4px;
  background: transparent;
}

.progress-bar__value {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--accent), var(--secondary));
  box-shadow: 0 0 14px rgba(234, 107, 36, 0.3);
}

.doc-masthead {
  position: fixed;
  inset: 0 0 auto;
  z-index: 80;
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr) 220px;
  align-items: center;
  gap: 0.9rem;
  min-height: var(--masthead-height);
  padding: 0 28px;
  background: var(--masthead-bg);
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.05),
    0 8px 24px rgba(8, 12, 24, 0.18);
}

.doc-masthead__brand,
.doc-masthead__spacer {
  min-width: 0;
}

.doc-masthead__brand {
  display: inline-flex;
  align-items: center;
  justify-self: start;
  color: var(--masthead-text);
}

.doc-masthead__brand-logo {
  display: block;
  width: 132px;
  height: auto;
  flex: 0 0 auto;
}

.doc-masthead__title {
  color: var(--masthead-text);
  text-align: center;
  font-family: var(--font-heading);
  font-size: clamp(1.02rem, 0.96vw, 1.3rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.doc-masthead__spacer {
  visibility: hidden;
}

.mobile-nav-toggle {
  position: fixed;
  top: calc(var(--masthead-height) + 0.85rem);
  right: 1rem;
  z-index: 40;
  display: none;
  border: 1px solid var(--line);
  background: var(--surface-strong);
  color: var(--text);
  padding: 0.8rem 1rem;
  border-radius: 999px;
  box-shadow: var(--shadow);
  font: inherit;
  cursor: pointer;
}

.layout {
  display: grid;
  grid-template-columns: minmax(280px, var(--sidebar-width)) minmax(0, 1fr);
  gap: 1.5rem;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.15rem;
}

.sidebar {
  position: sticky;
  top: calc(var(--masthead-height) + 1rem);
  align-self: start;
  max-height: calc(100vh - var(--masthead-height) - 2rem);
  overflow: auto;
  padding: 1.2rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: var(--surface);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow);
}

.sidebar__brand h1,
.hero h2,
.section h3 {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 700;
  letter-spacing: -0.04em;
}

.sidebar__brand h1 {
  font-size: clamp(1.75rem, 2vw, 2.35rem);
  line-height: 1.1;
}

.hero h2 {
  font-size: clamp(1.9rem, 2.2vw, 2.7rem);
  line-height: 1.14;
}

.section h3 {
  font-size: clamp(1.45rem, 1.5vw, 1.95rem);
  line-height: 1.15;
}

.sidebar__brand p,
.hero__lede,
.section p,
.info-card li,
.definition-card p,
.timeline-card p,
.step-card p,
.accordion__body p {
  color: var(--text-soft);
}

.brand-chip,
.eyebrow,
.section__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.sidebar__tools {
  margin-top: 1.2rem;
}

.search-field {
  display: grid;
  gap: 0.55rem;
  font-size: 0.92rem;
  font-weight: 600;
}

.search-field input {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--surface-strong);
  color: var(--text);
  border-radius: 14px;
  padding: 0.9rem 1rem;
  font: inherit;
}

.sidebar__buttons {
  display: flex;
  gap: 0.75rem;
  margin-top: 0.9rem;
}

.ghost-button {
  flex: 1;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text);
  border-radius: 14px;
  padding: 0.8rem 0.95rem;
  font: inherit;
  cursor: pointer;
}

.ghost-button:hover,
.mobile-nav-toggle:hover {
  border-color: rgba(234, 107, 36, 0.36);
}

.sidebar__nav {
  margin-top: 1.4rem;
  display: grid;
  gap: 1.2rem;
}

.nav-group {
  display: grid;
  gap: 0.35rem;
}

.nav-group__title {
  font-size: 0.82rem;
  font-weight: 800;
  color: var(--text-soft);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.3rem;
}

.nav-link {
  text-decoration: none;
  padding: 0.58rem 0.72rem;
  border-radius: 12px;
  color: var(--text-soft);
  transition: 0.18s ease;
}

.nav-link:hover,
.nav-link.is-active {
  background: linear-gradient(90deg, var(--accent-soft), rgba(15, 124, 130, 0.05));
  color: var(--text);
}

.content {
  min-width: 0;
  display: grid;
  gap: 1.6rem;
}

main [id] {
  scroll-margin-top: calc(var(--masthead-height) + 1rem);
}

.hero,
.section,
.doc-footer {
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: var(--surface);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(300px, 0.9fr);
  gap: 1.3rem;
  padding: 1.65rem;
}

.hero__copy {
  display: grid;
  gap: 1rem;
}

.hero__lede {
  max-width: 68ch;
  font-size: 0.98rem;
}

.hero__badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.38rem 0.72rem;
  border-radius: 999px;
  background: var(--surface-muted);
  border: 1px solid var(--line);
  font-size: 0.82rem;
  font-weight: 700;
}

.hero__stats,
.timeline-grid,
.definition-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.stat-card,
.timeline-card,
.definition-card,
.info-card,
.table-card,
.media-card,
.callout,
.code-card,
.matrix-card,
.mock-screen,
.scope-list {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface-strong);
}

.stat-card,
.timeline-card,
.definition-card,
.info-card,
.table-card,
.media-card,
.callout,
.code-card,
.matrix-card,
.scope-list {
  padding: 1.15rem 1.2rem;
}

.stat-card__label {
  display: block;
  color: var(--text-soft);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.35rem;
}

.section {
  padding: 1.7rem;
}

.section__header {
  display: grid;
  gap: 0.7rem;
  margin-bottom: 1.2rem;
}

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

.step-list,
.accordion,
.reference-list {
  display: grid;
  gap: 1rem;
}

.step-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  padding: 1rem 0;
  border-top: 1px solid var(--line);
}

.step-card:first-child {
  border-top: none;
  padding-top: 0;
}

.step-card__index,
.timeline-card__step {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--accent), var(--secondary));
  color: white;
  font-weight: 800;
  box-shadow: 0 10px 20px rgba(19, 35, 55, 0.14);
}

.timeline-card__step {
  margin-bottom: 0.75rem;
}

.table-card table,
.matrix-card table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.table-card th,
.table-card td,
.matrix-card th,
.matrix-card td {
  text-align: left;
  vertical-align: top;
  padding: 0.9rem 0.75rem;
  border-top: 1px solid var(--line);
}

.table-card thead th,
.matrix-card thead th {
  border-top: none;
  color: var(--text-soft);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.callout {
  position: relative;
  overflow: hidden;
}

.callout::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 5px;
  background: var(--info);
}

.callout--tip::before {
  background: var(--success);
}

.callout--warn::before {
  background: var(--warn);
}

.callout--info::before {
  background: var(--info);
}

.callout h4,
.info-card h4,
.definition-card h4,
.timeline-card h4,
.code-card h4,
.media-card h4,
.mock-screen h4 {
  margin-top: 0;
  margin-bottom: 0.55rem;
}

.scope-list ul,
.info-card ul,
.info-card ol,
.definition-card ul {
  margin: 0;
  padding-left: 1.2rem;
}

.scope-list li,
.info-card li {
  margin-bottom: 0.45rem;
}

.code-card {
  display: grid;
  gap: 0.85rem;
}

.scope-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.scope-pills span {
  display: inline-flex;
  padding: 0.38rem 0.7rem;
  border-radius: 999px;
  background: var(--secondary-soft);
  color: var(--secondary);
  font-size: 0.84rem;
  font-weight: 700;
}

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

.mock-screen {
  padding: 0;
  overflow: hidden;
}

.mock-screen__topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.85rem 1rem;
  background: linear-gradient(90deg, rgba(234, 107, 36, 0.12), rgba(15, 124, 130, 0.12));
  border-bottom: 1px solid var(--line);
}

.mock-screen__body {
  padding: 1rem;
  display: grid;
  gap: 0.8rem;
}

.mock-pill-row,
.mock-lines {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.mock-pill,
.mock-chip {
  display: inline-flex;
  padding: 0.3rem 0.65rem;
  border-radius: 999px;
  background: var(--surface-muted);
  border: 1px solid var(--line);
  font-size: 0.8rem;
  color: var(--text-soft);
}

.mock-row {
  display: grid;
  gap: 0.35rem;
  padding: 0.85rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--surface-muted);
}

.mock-line {
  height: 0.72rem;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(22, 34, 50, 0.12), rgba(22, 34, 50, 0.05));
}

body[data-theme="dark"] .mock-line {
  background: linear-gradient(90deg, rgba(245, 248, 252, 0.14), rgba(245, 248, 252, 0.05));
}

.mock-line.w-100 { width: 100%; }
.mock-line.w-85 { width: 85%; }
.mock-line.w-72 { width: 72%; }
.mock-line.w-60 { width: 60%; }
.mock-line.w-45 { width: 45%; }
.mock-line.w-30 { width: 30%; }

.screenshot-grid {
  display: grid;
  gap: 1rem;
  margin-top: 1rem;
}

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

.screenshot-card {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface-strong);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.screenshot-card__trigger {
  position: relative;
  display: block;
  width: 100%;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: zoom-in;
  text-align: left;
}

.screenshot-card__trigger:focus-visible {
  outline: 3px solid rgba(234, 107, 36, 0.4);
  outline-offset: -3px;
}

.screenshot-card img {
  display: block;
  width: 100%;
  height: auto;
  background: linear-gradient(180deg, rgba(15, 124, 130, 0.04), rgba(234, 107, 36, 0.04));
}

.screenshot-card__hint {
  position: absolute;
  inset: auto 1rem 1rem 1rem;
  display: inline-grid;
  gap: 0.1rem;
  max-width: calc(100% - 2rem);
  padding: 0.6rem 0.85rem;
  border-radius: 14px;
  background: rgba(19, 35, 55, 0.78);
  color: white;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.18s ease, transform 0.18s ease;
  pointer-events: none;
  box-shadow: 0 12px 24px rgba(19, 35, 55, 0.22);
}

.screenshot-card__hint strong {
  font-size: 0.88rem;
}

.screenshot-card__hint span {
  font-size: 0.78rem;
  opacity: 0.84;
}

.screenshot-card__trigger:hover .screenshot-card__hint,
.screenshot-card__trigger:focus-visible .screenshot-card__hint {
  opacity: 1;
  transform: translateY(0);
}

.screenshot-card figcaption {
  padding: 0.9rem 1rem 1rem;
  border-top: 1px solid var(--line);
  color: var(--text-soft);
  font-size: 0.92rem;
  line-height: 1.55;
}

.has-lightbox-open {
  overflow: hidden;
}

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: none;
}

.lightbox.is-open {
  display: block;
}

.lightbox__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(10, 18, 28, 0.84);
  backdrop-filter: blur(8px);
}

.lightbox__dialog {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 0.9rem;
  width: min(94vw, 1400px);
  max-height: calc(100vh - 3rem);
  margin: 1.5rem auto;
  padding: 1rem;
  border-radius: var(--radius-xl);
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(9, 14, 22, 0.94);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
}

.lightbox__close {
  justify-self: end;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  color: white;
  padding: 0.45rem 0.85rem;
  font: inherit;
  cursor: pointer;
}

.lightbox__image {
  display: block;
  width: 100%;
  max-height: calc(100vh - 10rem);
  object-fit: contain;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.02);
}

.lightbox__caption {
  margin: 0;
  color: rgba(255, 255, 255, 0.88);
  font-size: 0.95rem;
  line-height: 1.6;
}

.reference-list a {
  text-decoration: none;
  padding: 0.9rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: var(--surface-strong);
  transition: 0.18s ease;
}

.reference-list a:hover {
  border-color: rgba(234, 107, 36, 0.35);
  transform: translateY(-1px);
}

mark {
  background: rgba(255, 225, 122, 0.58);
  color: inherit;
  border-radius: 6px;
  padding: 0 0.15rem;
}

.doc-footer {
  padding: 1.35rem 1.5rem;
  color: var(--text-soft);
}

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

details {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface-strong);
  padding: 0.95rem 1rem;
}

summary {
  cursor: pointer;
  font-weight: 700;
}

.accordion__body {
  margin-top: 0.8rem;
}

@media (max-width: 1200px) {
  .mobile-nav-toggle {
    display: inline-flex;
  }

  .layout {
    grid-template-columns: minmax(0, 1fr);
    padding-top: 1.15rem;
  }

  .sidebar {
    position: fixed;
    top: calc(var(--masthead-height) + 1rem);
    left: 1rem;
    width: min(92vw, 360px);
    max-height: calc(100vh - var(--masthead-height) - 2rem);
    z-index: 30;
    transform: translateX(calc(-100% - 2rem));
    transition: transform 0.24s ease;
  }

  .sidebar.is-open {
    transform: translateX(0);
  }

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

  .lightbox__dialog {
    width: min(96vw, 1200px);
    margin: 1rem auto;
    max-height: calc(100vh - 2rem);
  }
}

@media (max-width: 900px) {
  :root {
    --masthead-height: 96px;
  }

  .doc-masthead {
    grid-template-columns: minmax(0, 1fr);
    justify-items: start;
    gap: 0.55rem;
    min-height: auto;
    padding: 0.85rem 1rem;
  }

  .doc-masthead__title {
    text-align: left;
    font-size: 1rem;
  }

  .doc-masthead__spacer {
    display: none;
  }

  .doc-masthead__brand-logo {
    width: 122px;
  }

  .hero__stats,
  .timeline-grid,
  .definition-grid,
  .grid-2,
  .mock-grid,
  .screenshot-grid--two {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media print {
  .sidebar,
  .mobile-nav-toggle,
  .progress-bar {
    display: none !important;
  }

  .layout {
    display: block;
    max-width: none;
    padding: 0;
  }

  .hero,
  .section,
  .doc-footer,
  .stat-card,
  .timeline-card,
  .definition-card,
  .info-card,
  .table-card,
  .media-card,
  .callout,
  .code-card,
  .matrix-card,
  .mock-screen,
  .screenshot-card,
  .scope-list,
  details {
    box-shadow: none !important;
    break-inside: avoid;
  }

  body {
    background: white;
  }

  .lightbox {
    display: none !important;
  }
}