:root {
  color-scheme: light dark;
  --bg: #0b0d14;
  --bg-elevated: rgba(255, 255, 255, 0.04);
  --text: #e8eaef;
  --muted: #9aa3b2;
  --accent: #a78bfa;
  --accent-soft: rgba(167, 139, 250, 0.14);
  --accent-border: rgba(167, 139, 250, 0.35);
  --card: rgba(255, 255, 255, 0.04);
  --border: rgba(255, 255, 255, 0.1);
  --pro: #fbbf24;
  --pro-text: #fde68a;
  --pro-soft: rgba(251, 191, 36, 0.12);
  --pro-border: rgba(251, 191, 36, 0.35);
  --success: #34d399;
  --success-text: #6ee7b7;
  --success-soft: rgba(52, 211, 153, 0.1);
  --success-border: rgba(52, 211, 153, 0.35);
  --badge-neutral-bg: rgba(255, 255, 255, 0.04);
  --badge-neutral-border: rgba(255, 255, 255, 0.1);
  --badge-neutral-text: #cbd5e1;
  --nav-hover: rgba(255, 255, 255, 0.06);
  --shadow-card: 0 24px 60px rgba(0, 0, 0, 0.18);
  --max-width: 960px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f8fafc;
    --bg-elevated: #ffffff;
    --text: #0f172a;
    --muted: #64748b;
    --card: #ffffff;
    --border: #e2e8f0;
    --accent: #7c3aed;
    --accent-soft: rgba(124, 58, 237, 0.08);
    --accent-border: rgba(124, 58, 237, 0.22);
    --pro: #b45309;
    --pro-text: #92400e;
    --pro-soft: #fffbeb;
    --pro-border: #fde68a;
    --success: #047857;
    --success-text: #065f46;
    --success-soft: #ecfdf5;
    --success-border: #a7f3d0;
    --badge-neutral-bg: #f1f5f9;
    --badge-neutral-border: #cbd5e1;
    --badge-neutral-text: #475569;
    --nav-hover: #f1f5f9;
    --shadow-card: 0 1px 2px rgba(15, 23, 42, 0.06), 0 8px 24px rgba(15, 23, 42, 0.04);
  }

  body {
    background:
      radial-gradient(circle at 15% -5%, rgba(124, 58, 237, 0.06), transparent 42%),
      radial-gradient(circle at 85% 0%, rgba(59, 130, 246, 0.04), transparent 35%),
      var(--bg);
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: ui-sans-serif, system-ui, -apple-system, 'Segoe UI', sans-serif;
  background:
    radial-gradient(circle at 15% -5%, rgba(167, 139, 250, 0.18), transparent 42%),
    radial-gradient(circle at 85% 0%, rgba(96, 165, 250, 0.08), transparent 35%),
    var(--bg);
  color: var(--text);
  line-height: 1.65;
}

a {
  color: var(--accent);
}

img {
  max-width: 100%;
  height: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(12px);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  border-bottom: 1px solid var(--border);
}

.site-header-inner,
.page-shell,
.site-footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.site-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 4rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: inherit;
  text-decoration: none;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand img {
  width: 2rem;
  height: 2rem;
  border-radius: 0.5rem;
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 0.25rem;
  font-size: 0.875rem;
}

.site-nav a {
  color: var(--muted);
  text-decoration: none;
  padding: 0.45rem 0.75rem;
  border-radius: 0.55rem;
  font-weight: 500;
  transition: color 0.15s ease, background 0.15s ease;
}

.site-nav a:hover {
  color: var(--text);
  background: var(--nav-hover);
}

.site-nav a.active {
  color: var(--text);
  background: var(--accent-soft);
}

.site-nav-divider {
  width: 1px;
  height: 1.35rem;
  background: var(--border);
  margin: 0 0.15rem;
  flex-shrink: 0;
}

.site-nav a.nav-external {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-left: 0.05rem;
  padding: 0.4rem 0.65rem;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text);
  box-shadow: 0 1px 0 rgba(127, 127, 127, 0.06);
  white-space: nowrap;
}

.site-nav a.nav-external:hover {
  border-color: var(--accent-border);
  background: var(--accent-soft);
  color: var(--text);
}

.nav-external-icon {
  flex-shrink: 0;
  opacity: 0.72;
}

.site-nav a.nav-external:hover .nav-external-icon {
  opacity: 1;
}

@media (min-width: 960px) {
  .site-nav {
    flex-wrap: nowrap;
    gap: 0.35rem;
  }
}

.lang-toggle {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: 0.55rem;
  overflow: hidden;
  margin-left: 0.35rem;
  background: var(--bg-elevated);
}

.lang-toggle button {
  border: 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.4rem 0.65rem;
  cursor: pointer;
  transition: color 0.15s ease, background 0.15s ease;
}

.lang-toggle button.active {
  background: var(--accent-soft);
  color: var(--text);
}

.lang-toggle button:hover:not(.active) {
  color: var(--text);
  background: var(--nav-hover);
}

.page-shell {
  padding-top: 2.5rem;
  padding-bottom: 4rem;
}

.hero {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 2rem;
  align-items: center;
  margin-bottom: 3rem;
}

@media (max-width: 800px) {
  .hero {
    grid-template-columns: 1fr;
  }
}

.hero-copy h1 {
  font-size: clamp(2rem, 5vw, 2.75rem);
  line-height: 1.1;
  margin: 0 0 0.75rem;
  letter-spacing: -0.03em;
}

.hero-copy .lead {
  font-size: 1.125rem;
  color: var(--muted);
  margin: 0 0 1.25rem;
  max-width: 38rem;
}

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.4rem 0.8rem;
  border-radius: 0.55rem;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  border: 1px solid var(--badge-neutral-border);
  background: var(--badge-neutral-bg);
  color: var(--badge-neutral-text);
  line-height: 1.2;
}

.badge.early {
  border-color: var(--pro-border);
  background: var(--pro-soft);
  color: var(--pro-text);
}

.badge.local {
  border-color: var(--success-border);
  background: var(--success-soft);
  color: var(--success-text);
}

.badge.version {
  border-color: var(--badge-neutral-border);
  background: var(--badge-neutral-bg);
  color: var(--badge-neutral-text);
}

.hero-card {
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: 1.25rem;
  padding: 1.5rem;
  box-shadow: var(--shadow-card);
}

.hero-card img {
  width: 5rem;
  height: 5rem;
  border-radius: 1rem;
  margin-bottom: 1rem;
}

.hero-card ul {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.section {
  margin-bottom: 2.5rem;
}

.section h2 {
  font-size: 1.35rem;
  margin: 0 0 0.75rem;
  letter-spacing: -0.02em;
}

.section-intro {
  color: var(--muted);
  margin: 0 0 1.25rem;
  max-width: 42rem;
}

.card {
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: 1rem;
  padding: 1.25rem 1.5rem;
}

.card.step {
  padding: 1.35rem 1.5rem;
}

.card h3 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
}

.grid-2,
.grid-3,
.feature-grid {
  display: grid;
  gap: 1rem;
}

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

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

.feature-grid {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

@media (max-width: 720px) {
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }

  .site-header-inner {
    flex-wrap: wrap;
    padding-top: 0.75rem;
    padding-bottom: 0.75rem;
  }

  .site-nav {
    width: 100%;
    flex-wrap: wrap;
    justify-content: flex-start;
  }

  .lang-toggle {
    margin-left: 0;
  }
}

.early-access-banner {
  border-color: var(--pro-border);
  background: var(--pro-soft);
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 1.85rem;
  height: 1.85rem;
  border-radius: 0.5rem;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 700;
}

.step-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.6rem;
}

.step h3,
.feature h3 {
  margin: 0;
  font-size: 1rem;
}

.step p,
.feature p {
  margin: 0;
  color: var(--muted);
  font-size: 0.925rem;
}

.feature h3 {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.tag {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.2rem 0.5rem;
  border-radius: 0.35rem;
  border: 1px solid transparent;
  flex-shrink: 0;
}

.tag.free {
  background: var(--success-soft);
  color: var(--success-text);
  border-color: var(--success-border);
}

.tag.pro {
  background: var(--pro-soft);
  color: var(--pro-text);
  border-color: var(--pro-border);
}

.feature.is-pro {
  border-color: var(--pro-border);
  background: color-mix(in srgb, var(--pro-soft) 55%, var(--card));
}

.download-section {
  scroll-margin-top: 5rem;
}

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

@media (max-width: 800px) {
  .download-grid {
    grid-template-columns: 1fr;
  }
}

.download-card {
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: 1rem;
  padding: 1.25rem;
}

.download-card h3 {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
}

.download-card .os-note {
  margin: 0 0 1rem;
  font-size: 0.85rem;
  color: var(--muted);
}

.download-actions {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1rem;
  border-radius: 0.7rem;
  border: 1px solid var(--accent-border);
  background: var(--accent-soft);
  color: inherit;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.925rem;
  transition: background 0.15s ease;
}

.btn:hover {
  background: rgba(167, 139, 250, 0.22);
}

.btn.secondary {
  border-color: var(--border);
  background: transparent;
  font-weight: 500;
}

.btn-download .os-logo {
  width: 1.125rem;
  height: 1.125rem;
  object-fit: contain;
  flex-shrink: 0;
}

.btn-download .os-logo.os-apple {
  filter: none;
}

@media (prefers-color-scheme: dark) {
  .btn-download .os-logo.os-apple {
    filter: invert(1);
  }
}

.download-gate {
  margin-bottom: 1rem;
}

.download-gate-form {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1rem;
}

.download-gate-form input {
  flex: 1 1 220px;
  min-width: 0;
  padding: 0.7rem 0.9rem;
  border-radius: 0.7rem;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: inherit;
  font: inherit;
}

.download-gate-form input:focus {
  outline: 2px solid var(--accent-border);
  outline-offset: 1px;
}

.gate-error {
  margin: 0.75rem 0 0;
  color: #f87171;
  font-size: 0.875rem;
}

.gate-success {
  margin: 0 0 1rem;
  color: var(--success);
  font-size: 0.925rem;
  font-weight: 600;
}

.download-gate.is-collapsed {
  display: none !important;
}

#download-unlocked {
  display: none;
}

#download-unlocked.is-visible {
  display: block;
}

.gate-success {
  display: none;
}

.gate-success.is-visible {
  display: block;
}

.gate-error.is-visible {
  display: block;
}

[hidden] {
  display: none !important;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1rem;
}

.note,
.fine-print {
  font-size: 0.875rem;
  color: var(--muted);
}

.note {
  margin-top: 1rem;
}

.help-list {
  margin: 0;
  padding-left: 1.2rem;
}

.help-list li {
  margin-bottom: 0.5rem;
}

.help-list li:last-child {
  margin-bottom: 0;
}

.toc {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.toc a {
  text-decoration: none;
  font-size: 0.84rem;
  font-weight: 500;
  padding: 0.45rem 0.85rem;
  border-radius: 0.55rem;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--muted);
  transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.toc a:hover {
  color: var(--text);
  border-color: var(--accent-border);
  background: var(--accent-soft);
}

.guide-breadcrumb {
  font-size: 0.875rem;
  color: var(--muted);
  margin: 0 0 1rem;
}

.guide-breadcrumb a {
  color: var(--muted);
  text-decoration: none;
}

.guide-breadcrumb a:hover {
  color: var(--text);
}

.guide-card-grid {
  display: grid;
  gap: 1.25rem;
}

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

.guide-card h2 {
  margin: 0.35rem 0 0.65rem;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
}

.guide-card h2 a {
  color: inherit;
  text-decoration: none;
}

.guide-card h2 a:hover {
  color: var(--accent);
}

.guide-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.925rem;
  line-height: 1.55;
}

.guide-card-tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid var(--accent-border);
  border-radius: 999px;
  padding: 0.2rem 0.55rem;
}

.guide-card-topics {
  margin: 1rem 0 0;
  padding-left: 1.15rem;
  color: var(--muted);
  font-size: 0.875rem;
}

.guide-card-topics li {
  margin-bottom: 0.35rem;
}

.guide-card-cta {
  margin-top: 1.15rem;
}

.guide-prose h1 {
  margin: 0 0 0.5rem;
  font-size: 2rem;
  letter-spacing: -0.02em;
}

.guide-prose h2 {
  margin: 0 0 0.75rem;
  font-size: 1.35rem;
  letter-spacing: -0.01em;
}

.guide-prose h3 {
  margin: 1.25rem 0 0.5rem;
  font-size: 1rem;
}

.guide-prose p {
  line-height: 1.6;
}

.guide-steps {
  margin: 0.5rem 0 1rem;
  padding-left: 1.35rem;
}

.guide-steps li {
  margin-bottom: 0.45rem;
  line-height: 1.55;
}

.guide-code {
  margin: 0.75rem 0 1rem;
  padding: 0.85rem 1rem;
  border-radius: 0.65rem;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  overflow-x: auto;
  font-size: 0.84rem;
  line-height: 1.5;
}

.guide-code code {
  padding: 0;
  background: none;
  font-size: inherit;
  white-space: pre;
}

.guide-callout {
  margin-top: 1rem;
  padding: 0.85rem 1rem;
  border-radius: 0.65rem;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  font-size: 0.9rem;
  line-height: 1.55;
}

.guide-callout-success {
  border-color: rgba(52, 211, 153, 0.35);
  background: rgba(52, 211, 153, 0.08);
}

.guide-callout-warn {
  border-color: rgba(251, 191, 36, 0.35);
  background: rgba(251, 191, 36, 0.08);
}

.guide-table-wrap {
  overflow-x: auto;
  margin: 1rem 0;
}

.guide-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.guide-table th,
.guide-table td {
  text-align: left;
  padding: 0.55rem 0.75rem;
  border-bottom: 1px solid var(--border);
}

.guide-table th {
  color: var(--muted);
  font-weight: 600;
}

.guide-table td code {
  font-size: 0.82em;
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0 2.5rem;
  font-size: 0.875rem;
  color: var(--muted);
}

.site-footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
}

.icon {
  width: 1.25rem;
  height: 1.25rem;
  flex-shrink: 0;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.85em;
  padding: 0.1rem 0.35rem;
  border-radius: 0.35rem;
  background: rgba(127, 127, 127, 0.15);
}

.changelog-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.changelog-entry-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem 1rem;
  margin-bottom: 0.75rem;
}

.changelog-version {
  margin: 0;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.changelog-date {
  font-size: 0.875rem;
  color: var(--muted);
}

.changelog-highlights {
  margin: 0;
}