/* ==========================================================================
   Document Chatbot — marketing site, tours and About page
   Plain CSS, no build step, no external assets. Shares the palette and
   component language of the chatbot UI in styles.css.
   ========================================================================== */

:root {
  --bg: #f4f6fb;
  --bg-soft: #eef2ff;
  --surface: #ffffff;
  --surface-2: #f8fafc;
  --surface-3: #f1f5f9;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  --text: #0f172a;
  --text-soft: #334155;
  --muted: #64748b;
  --accent: #4f46e5;
  --accent-strong: #4338ca;
  --accent-2: #7c3aed;
  --accent-soft: #eef2ff;
  --accent-border: #c7d2fe;
  --success: #15803d;
  --success-soft: #f0fdf4;
  --success-border: #bbf7d0;
  --warning: #92400e;
  --warning-soft: #fffbeb;
  --warning-border: #fde68a;
  --danger: #b91c1c;
  --danger-soft: #fef2f2;
  --danger-border: #fecaca;
  --radius-lg: 24px;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.04), 0 12px 34px rgba(15, 23, 42, 0.07);
  --shadow-lg: 0 24px 70px rgba(15, 23, 42, 0.14);
  --container: 1180px;
  --header-h: 72px;
  --font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
  --focus: 0 0 0 3px rgba(79, 70, 229, 0.24);
  color-scheme: light;
}

:root[data-theme="dark"] {
  --bg: #0b1120;
  --bg-soft: #101a2e;
  --surface: #111827;
  --surface-2: #0f172a;
  --surface-3: #1e293b;
  --border: #24324a;
  --border-strong: #334155;
  --text: #e2e8f0;
  --text-soft: #cbd5e1;
  --muted: #94a3b8;
  --accent: #6366f1;
  --accent-strong: #a5b4fc;
  --accent-2: #8b5cf6;
  --accent-soft: rgba(99, 102, 241, 0.16);
  --accent-border: rgba(129, 140, 248, 0.4);
  --success: #86efac;
  --success-soft: rgba(74, 222, 128, 0.12);
  --success-border: rgba(74, 222, 128, 0.36);
  --warning: #fcd34d;
  --warning-soft: rgba(251, 191, 36, 0.12);
  --warning-border: rgba(251, 191, 36, 0.36);
  --danger: #fca5a5;
  --danger-soft: rgba(248, 113, 113, 0.12);
  --danger-border: rgba(248, 113, 113, 0.36);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 12px 34px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 24px 70px rgba(0, 0, 0, 0.55);
  --focus: 0 0 0 3px rgba(99, 102, 241, 0.4);
  color-scheme: dark;
}

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

[hidden] {
  display: none !important;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 20px);
}

html.tour-open,
html.tour-open body {
  overflow: hidden;
}

body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(1000px 520px at 8% -8%, rgba(199, 210, 254, 0.55) 0%, transparent 62%),
    radial-gradient(900px 480px at 100% 0%, rgba(221, 214, 254, 0.45) 0%, transparent 58%),
    var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

:root[data-theme="dark"] body {
  background:
    radial-gradient(1000px 520px at 8% -8%, rgba(79, 70, 229, 0.2) 0%, transparent 62%),
    radial-gradient(900px 480px at 100% 0%, rgba(139, 92, 246, 0.14) 0%, transparent 58%),
    var(--bg);
}

h1,
h2,
h3,
h4,
p {
  margin: 0;
}

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

a {
  color: inherit;
}

button,
input,
textarea,
select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
}

:focus-visible {
  outline: none;
  box-shadow: var(--focus);
  border-radius: 7px;
}

::selection {
  background: rgba(79, 70, 229, 0.2);
}

.container {
  width: min(var(--container), calc(100% - 48px));
  margin-inline: auto;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: 10px 14px;
  border-radius: 9px;
  background: var(--accent);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 700;
  text-decoration: none;
  transform: translateY(-160%);
  transition: transform 140ms ease;
}

.skip-link:focus {
  transform: translateY(0);
}

/* ------------------------------------------------------------------ header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  border-bottom: 1px solid transparent;
  background: color-mix(in srgb, var(--bg) 84%, transparent);
  backdrop-filter: blur(14px);
  transition: border-color 160ms ease, box-shadow 160ms ease;
}

.site-header.is-scrolled {
  border-bottom-color: var(--border);
  box-shadow: var(--shadow-sm);
}

.site-header__inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: 20px;
  height: var(--header-h);
}

.site-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  min-width: 0;
}

.site-brand__mark {
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: linear-gradient(145deg, var(--accent), var(--accent-2));
  color: #fff;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  box-shadow: 0 6px 16px rgba(79, 70, 229, 0.28);
}

.site-brand__text {
  min-width: 0;
}

.site-brand__text strong {
  display: block;
  font-size: 0.96rem;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.site-brand__text span {
  display: block;
  overflow: hidden;
  color: var(--muted);
  font-size: 0.72rem;
  line-height: 1.3;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-left: auto;
}

.site-nav a:not(.btn) {
  padding: 8px 12px;
  border-radius: 9px;
  color: var(--muted);
  font-size: 0.84rem;
  font-weight: 600;
  text-decoration: none;
  transition: color 140ms ease, background 140ms ease;
}

.site-nav a:not(.btn):hover {
  background: var(--surface-2);
  color: var(--text);
}

.site-nav a[aria-current="page"] {
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.site-nav .btn {
  margin-left: 8px;
}

.site-tools {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: 8px;
}

.nav-toggle {
  display: none;
  place-items: center;
  width: 38px;
  height: 38px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  color: var(--muted);
}

.nav-toggle span {
  display: block;
  width: 16px;
  height: 2px;
  margin: 2px auto;
  border-radius: 2px;
  background: currentColor;
  transition: transform 160ms ease, opacity 160ms ease;
}

.site-header.is-open .nav-toggle span:nth-child(1) {
  transform: translateY(4px) rotate(45deg);
}

.site-header.is-open .nav-toggle span:nth-child(2) {
  opacity: 0;
}

.site-header.is-open .nav-toggle span:nth-child(3) {
  transform: translateY(-4px) rotate(-45deg);
}

.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  color: var(--muted);
  transition: color 140ms ease, background 140ms ease, border-color 140ms ease;
}

.icon-btn svg {
  width: 18px;
  height: 18px;
}

.icon-btn:hover {
  border-color: var(--border-strong);
  background: var(--surface-2);
  color: var(--text);
}

.theme-icon--sun {
  display: none;
}

:root[data-theme="dark"] .theme-icon--moon {
  display: none;
}

:root[data-theme="dark"] .theme-icon--sun {
  display: block;
}

.github-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  height: 38px;
  padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  transition: color 140ms ease, background 140ms ease, border-color 140ms ease;
}

.github-link svg {
  width: 17px;
  height: 17px;
  flex: 0 0 auto;
}

.github-link:hover {
  border-color: var(--border-strong);
  background: var(--surface-2);
  color: var(--text);
}

/* ----------------------------------------------------------------- buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 18px;
  border: 1px solid transparent;
  border-radius: 12px;
  font-size: 0.9rem;
  font-weight: 700;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  white-space: nowrap;
  transition: background 140ms ease, border-color 140ms ease, color 140ms ease,
    transform 100ms ease, box-shadow 140ms ease;
}

.btn svg {
  width: 17px;
  height: 17px;
  flex: 0 0 auto;
}

.btn:active {
  transform: translateY(1px);
}

.btn--primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  box-shadow: 0 8px 20px rgba(79, 70, 229, 0.24);
}

.btn--primary:hover {
  box-shadow: 0 10px 26px rgba(79, 70, 229, 0.32);
  transform: translateY(-1px);
}

.btn--secondary {
  border-color: var(--border-strong);
  background: var(--surface);
  color: var(--text);
  box-shadow: var(--shadow-sm);
}

.btn--secondary:hover {
  border-color: var(--accent);
  color: var(--accent-strong);
}

.btn--ghost {
  border-color: transparent;
  background: transparent;
  color: var(--muted);
}

.btn--ghost:hover {
  background: var(--surface-2);
  color: var(--text);
}

.btn--sm {
  min-height: 36px;
  padding: 7px 14px;
  border-radius: 10px;
  font-size: 0.82rem;
}

/* -------------------------------------------------------------------- hero */

.hero {
  padding: 72px 0 60px;
}

.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.04fr) minmax(0, 0.96fr);
  gap: 56px;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border: 1px solid var(--accent-border);
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.eyebrow::before {
  content: "";
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

.hero h1 {
  margin-top: 18px;
  font-size: clamp(2.35rem, 4.7vw, 3.9rem);
  font-weight: 800;
  letter-spacing: -0.045em;
  line-height: 1.06;
}

.hero h1 .grad {
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero__lede {
  max-width: 570px;
  margin-top: 18px;
  color: var(--muted);
  font-size: 1.02rem;
  line-height: 1.72;
}

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

.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-top: 26px;
  padding-top: 22px;
  border-top: 1px solid var(--border);
}

.hero__meta span {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--muted);
  font-size: 0.79rem;
  font-weight: 600;
}

.hero__meta svg {
  width: 15px;
  height: 15px;
  flex: 0 0 auto;
  color: var(--accent);
}

/* ----------------------------------------------------------- hero visual */

.hero-visual {
  position: relative;
  min-width: 0;
}

.hero-visual__glow {
  position: absolute;
  inset: -12%;
  z-index: -1;
  background: radial-gradient(circle at 62% 42%, rgba(99, 102, 241, 0.24), transparent 62%);
  filter: blur(18px);
}

.hv-window {
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--surface);
  box-shadow: var(--shadow-lg);
}

.hv-topbar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--surface-2);
}

.hv-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border-strong);
}

.hv-title {
  margin-left: auto;
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 600;
}

.hv-body {
  display: grid;
  padding: 18px;
}

.hv-card {
  padding: 13px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface-2);
}

.hv-card__head {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
  font-size: 0.78rem;
  font-weight: 700;
}

.hv-card__head svg {
  width: 16px;
  height: 16px;
  color: var(--accent);
}

.hv-badge {
  margin-left: auto;
  padding: 2px 7px;
  border-radius: 999px;
  background: var(--surface-3);
  color: var(--muted);
  font-size: 0.62rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.hv-badge--soft {
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.hv-drop {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px;
  border: 1px dashed var(--border-strong);
  border-radius: 10px;
  background: var(--surface);
}

.hv-drop svg {
  width: 20px;
  height: 20px;
  flex: 0 0 auto;
  color: var(--accent);
}

.hv-drop strong {
  display: block;
  font-size: 0.76rem;
}

.hv-drop small {
  display: block;
  color: var(--muted);
  font-size: 0.64rem;
}

.hv-drop .hv-badge {
  margin-left: auto;
}

.hv-connector {
  display: grid;
  place-items: center;
  height: 22px;
}

.hv-connector span {
  position: relative;
  width: 2px;
  height: 100%;
  background: linear-gradient(var(--accent-border), var(--accent));
}

.hv-connector span::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 50%;
  width: 6px;
  height: 6px;
  border-right: 2px solid var(--accent);
  border-bottom: 2px solid var(--accent);
  transform: translateX(-50%) rotate(45deg);
}

.hv-snippet {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  gap: 8px;
  padding: 9px;
  border: 1px solid var(--border);
  border-radius: 9px;
  background: var(--surface);
}

.hv-snippet + .hv-snippet {
  margin-top: 7px;
}

.hv-snippet__rank {
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  border-radius: 6px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 0.66rem;
  font-weight: 800;
}

.hv-snippet p {
  display: -webkit-box;
  overflow: hidden;
  color: var(--text-soft);
  font-size: 0.74rem;
  line-height: 1.45;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.hv-snippet__meta {
  grid-column: 2;
  color: var(--muted);
  font-size: 0.64rem;
}

.hv-answer {
  background: linear-gradient(180deg, var(--surface), var(--accent-soft));
}

.hv-ai {
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border-radius: 7px;
  background: var(--accent);
  color: #fff;
  font-size: 0.6rem;
  font-weight: 800;
}

.hv-answer p {
  color: var(--text-soft);
  font-size: 0.79rem;
  line-height: 1.55;
}

.hv-sources {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 10px;
}

.hv-sources span {
  padding: 3px 7px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  font-size: 0.63rem;
  font-weight: 600;
}

.hero-visual__caption {
  margin-top: 12px;
  color: var(--muted);
  font-size: 0.7rem;
  text-align: center;
}

/* ---------------------------------------------------------------- sections */

.section {
  padding: 76px 0;
}

.section--soft {
  border-block: 1px solid var(--border);
  background: var(--bg-soft);
}

.section-head {
  max-width: 700px;
  margin: 0 auto 42px;
  text-align: center;
}

.section-head .eyebrow {
  margin-bottom: 14px;
}

.section-head h2 {
  font-size: clamp(1.75rem, 3.1vw, 2.45rem);
  letter-spacing: -0.035em;
  line-height: 1.14;
}

.section-head p {
  margin-top: 12px;
  color: var(--muted);
  font-size: 0.98rem;
  line-height: 1.7;
}

.section-head--left {
  margin-inline: 0;
  text-align: left;
}

/* ---------------------------------------------------------------- features */

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.feature-card {
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.feature-card:hover {
  border-color: var(--accent-border);
  box-shadow: var(--shadow);
  transform: translateY(-3px);
}

.feature-icon {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  margin-bottom: 16px;
  border-radius: 12px;
  background: var(--accent-soft);
  color: var(--accent);
}

.feature-icon svg {
  width: 21px;
  height: 21px;
}

.feature-card h3 {
  font-size: 1rem;
  letter-spacing: -0.015em;
}

.feature-card p {
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.62;
}

.feature-card code {
  padding: 1px 5px;
  border-radius: 5px;
  background: var(--surface-3);
  font-family: var(--mono);
  font-size: 0.78em;
}

/* ---------------------------------------------------------------- pipeline */

.pipeline {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: 10px;
}

.pipeline-step {
  position: relative;
  padding: 16px 10px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
  text-align: center;
  box-shadow: var(--shadow-sm);
}

.pipeline-step::after {
  content: "";
  position: absolute;
  top: 50%;
  right: -10px;
  width: 10px;
  height: 2px;
  background: var(--border-strong);
}

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

.pipeline-num {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  margin: 0 auto 10px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 0.72rem;
  font-weight: 800;
}

.pipeline-step strong {
  display: block;
  font-size: 0.8rem;
  letter-spacing: -0.01em;
}

.pipeline-step span {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 0.68rem;
  line-height: 1.4;
}

.pipeline-cta {
  margin-top: 30px;
  text-align: center;
}

/* ------------------------------------------------------------------- tech */

.tech-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.tech-card {
  display: flex;
  gap: 12px;
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

.tech-icon {
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.tech-icon svg {
  width: 19px;
  height: 19px;
}

.tech-card strong {
  display: block;
  font-size: 0.86rem;
  letter-spacing: -0.01em;
}

.tech-card span {
  display: block;
  margin-top: 2px;
  color: var(--muted);
  font-size: 0.72rem;
  line-height: 1.45;
}

.tech-note {
  margin-top: 20px;
  color: var(--muted);
  font-size: 0.76rem;
  text-align: center;
}

/* --------------------------------------------------------------- cta band */

.cta-band {
  position: relative;
  overflow: hidden;
  padding: 58px 32px;
  border-radius: 26px;
  background:
    radial-gradient(620px 300px at 20% 0%, rgba(129, 140, 248, 0.35), transparent 65%),
    radial-gradient(520px 280px at 85% 100%, rgba(167, 139, 250, 0.28), transparent 60%),
    linear-gradient(135deg, #1e1b4b, #312e81 55%, #4c1d95);
  color: #fff;
  text-align: center;
  box-shadow: var(--shadow-lg);
}

.cta-band::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: radial-gradient(circle at 50% 40%, #000 0%, transparent 75%);
  pointer-events: none;
}

.cta-band > * {
  position: relative;
}

.cta-band h2 {
  font-size: clamp(1.85rem, 3.2vw, 2.6rem);
  letter-spacing: -0.04em;
  line-height: 1.1;
}

.cta-band p {
  max-width: 580px;
  margin: 12px auto 0;
  color: rgba(255, 255, 255, 0.74);
  font-size: 0.96rem;
}

.cta-band__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 26px;
}

.cta-band .btn--secondary {
  border-color: rgba(255, 255, 255, 0.26);
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
}

.cta-band .btn--secondary:hover {
  border-color: rgba(255, 255, 255, 0.45);
  background: rgba(255, 255, 255, 0.16);
  color: #fff;
}

/* ----------------------------------------------------------------- footer */

.site-footer {
  padding: 44px 0 30px;
  border-top: 1px solid var(--border);
  background: var(--surface);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 32px;
}

.footer-brand p {
  max-width: 340px;
  margin-top: 12px;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.65;
}

.footer-col h3 {
  margin-bottom: 12px;
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.footer-col a {
  display: block;
  margin-top: 7px;
  color: var(--text-soft);
  font-size: 0.84rem;
  text-decoration: none;
}

.footer-col a:hover {
  color: var(--accent-strong);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 32px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.74rem;
}

.footer-bottom a {
  color: var(--muted);
  text-decoration: none;
}

.footer-bottom a:hover {
  color: var(--accent-strong);
}

/* ------------------------------------------------------------- reveal anim */

/* Only hide reveal content when JS is available; otherwise it stays readable. */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 500ms ease, transform 500ms ease;
}

html.js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* --------------------------------------------------------------- tour page */

.tour-hero {
  padding: 64px 0 34px;
  text-align: center;
}

.tour-hero h1 {
  max-width: 820px;
  margin: 16px auto 0;
  font-size: clamp(2rem, 4vw, 3rem);
  letter-spacing: -0.04em;
  line-height: 1.1;
}

.tour-hero p {
  max-width: 660px;
  margin: 14px auto 0;
  color: var(--muted);
  font-size: 0.98rem;
}

.tour-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
  padding-bottom: 34px;
}

.tour-card {
  display: flex;
  flex-direction: column;
  padding: 28px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  transition: border-color 180ms ease, box-shadow 180ms ease, transform 180ms ease;
}

.tour-card:hover {
  border-color: var(--accent-border);
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.tour-card__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.tour-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  border: 1px solid var(--accent-border);
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 0.66rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.tour-card h2 {
  margin-top: 16px;
  font-size: 1.3rem;
  letter-spacing: -0.025em;
  line-height: 1.25;
}

.tour-card > p {
  margin-top: 10px;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.65;
}

.tour-card ul {
  display: grid;
  gap: 8px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.tour-card li {
  display: flex;
  gap: 9px;
  color: var(--text-soft);
  font-size: 0.82rem;
  line-height: 1.5;
}

.tour-card li::before {
  content: "✓";
  flex: 0 0 auto;
  color: var(--accent);
  font-weight: 800;
}

.tour-card__foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: auto;
  padding-top: 24px;
}

.tour-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
  font-size: 0.74rem;
  font-weight: 600;
}

.tour-status::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--border-strong);
}

.tour-status[data-state="completed"] {
  color: var(--success);
}

.tour-status[data-state="completed"]::before {
  background: var(--success);
}

.tour-status[data-state="skipped"] {
  color: var(--warning);
}

.tour-status[data-state="skipped"]::before {
  background: var(--warning);
}

.tour-status[data-state="in-progress"] {
  color: var(--accent-strong);
}

.tour-status[data-state="in-progress"]::before {
  background: var(--accent);
}

.skip-panel {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 64px;
  padding: 22px 26px;
  border: 1px dashed var(--border-strong);
  border-radius: 18px;
  background: var(--surface-2);
}

.skip-panel h2 {
  font-size: 1rem;
  letter-spacing: -0.01em;
}

.skip-panel p {
  margin-top: 4px;
  color: var(--muted);
  font-size: 0.82rem;
}

/* ------------------------------------------------------------- tour dialog */

.tour-dialog {
  width: min(1080px, calc(100vw - 32px));
  max-width: 1080px;
  max-height: calc(100dvh - 32px);
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 22px;
  background: var(--surface);
  color: var(--text);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.tour-dialog::backdrop {
  background: rgba(15, 23, 42, 0.56);
  backdrop-filter: blur(4px);
}

.tour-shell {
  display: flex;
  flex-direction: column;
  max-height: calc(100dvh - 32px);
}

.tour-head {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 22px 26px 14px;
  border-bottom: 1px solid var(--border);
}

.tour-kicker {
  color: var(--accent-strong);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.tour-head h2 {
  margin-top: 4px;
  font-size: 1.25rem;
  letter-spacing: -0.025em;
  line-height: 1.25;
}

.tour-head h2:focus-visible {
  box-shadow: none;
}

.tour-subtitle {
  margin-top: 4px;
  color: var(--muted);
  font-size: 0.82rem;
}

.tour-close {
  flex: 0 0 auto;
  margin-left: auto;
  font-size: 1.15rem;
  line-height: 1;
}

.tour-progress {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 26px;
  border-bottom: 1px solid var(--border);
  background: var(--surface-2);
}

.tour-progress__bar {
  flex: 1;
  height: 6px;
  overflow: hidden;
  border-radius: 999px;
  background: var(--surface-3);
}

.tour-progress__bar span {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transition: width 260ms ease;
}

.tour-progress__label {
  flex: 0 0 auto;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 700;
}

.tour-body {
  display: grid;
  grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
  flex: 1;
  min-height: 0;
  overflow: hidden;
}

.tour-copy {
  padding: 24px 26px 28px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
}

.tour-visual {
  padding: 24px;
  border-left: 1px solid var(--border);
  background: var(--surface-2);
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
}

.tour-block + .tour-block {
  margin-top: 16px;
}

.tour-block h3 {
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.tour-block p {
  margin-top: 6px;
  color: var(--text-soft);
  font-size: 0.88rem;
  line-height: 1.68;
}

.tour-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 20px;
}

.tour-fact {
  padding: 11px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface-2);
}

.tour-fact span {
  display: block;
  color: var(--muted);
  font-size: 0.62rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.tour-fact strong {
  display: block;
  margin-top: 3px;
  font-size: 0.78rem;
  font-weight: 650;
  line-height: 1.45;
}

.tour-foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 26px;
  border-top: 1px solid var(--border);
  background: var(--surface);
}

.tour-nav {
  display: flex;
  gap: 8px;
}

.tour-complete {
  display: grid;
  place-items: center;
  padding: 56px 28px;
  text-align: center;
}

.tour-complete__icon {
  display: grid;
  place-items: center;
  width: 62px;
  height: 62px;
  margin-bottom: 18px;
  border: 1px solid var(--success-border);
  border-radius: 50%;
  background: var(--success-soft);
  color: var(--success);
  font-size: 1.5rem;
  font-weight: 800;
}

.tour-complete h2 {
  max-width: 620px;
  margin-top: 6px;
  font-size: clamp(1.5rem, 3vw, 2rem);
  letter-spacing: -0.03em;
  line-height: 1.2;
}

.tour-complete h2:focus-visible {
  box-shadow: none;
}

.tour-complete p {
  max-width: 580px;
  margin-top: 10px;
  color: var(--muted);
  font-size: 0.92rem;
}

.tour-complete__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-top: 26px;
}

/* ------------------------------------------------------- tour visual pieces */

.tv-title {
  margin-bottom: 14px;
  color: var(--muted);
  font-size: 0.66rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.tv-stack {
  display: grid;
}

.tv-node {
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

.tv-node strong {
  display: block;
  font-size: 0.8rem;
  letter-spacing: -0.01em;
}

.tv-node span {
  display: block;
  margin-top: 2px;
  color: var(--muted);
  font-size: 0.7rem;
  line-height: 1.45;
}

.tv-node code {
  padding: 1px 4px;
  border-radius: 4px;
  background: var(--surface-3);
  font-family: var(--mono);
  font-size: 0.9em;
}

.tv-node--accent {
  border-color: var(--accent-border);
  background: var(--accent-soft);
}

.tv-arrow {
  position: relative;
  width: 2px;
  height: 18px;
  margin: 0 auto;
  background: linear-gradient(var(--accent-border), var(--accent));
}

.tv-arrow::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 50%;
  width: 6px;
  height: 6px;
  border-right: 2px solid var(--accent);
  border-bottom: 2px solid var(--accent);
  transform: translateX(-50%) rotate(45deg);
}

.tv-note {
  margin-top: 14px;
  color: var(--muted);
  font-size: 0.7rem;
  line-height: 1.5;
}

.tv-mono {
  font-family: var(--mono);
  font-size: 0.68rem !important;
}

.tv-split {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.tv-file {
  padding: 10px 8px;
  border: 1px solid var(--border);
  border-radius: 9px;
  background: var(--surface);
  text-align: center;
}

.tv-file strong {
  display: block;
  font-size: 0.7rem;
}

.tv-file span {
  display: block;
  margin-top: 2px;
  color: var(--muted);
  font-size: 0.6rem;
  line-height: 1.35;
}

.tv-chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}

.tv-chip {
  padding: 3px 7px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  font-size: 0.61rem;
  font-weight: 650;
}

.tv-chip--accent {
  border-color: var(--accent-border);
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.tv-code {
  margin: 0;
  padding: 13px 14px;
  border: 1px solid #1e293b;
  border-radius: 10px;
  background: #0f172a;
  color: #e2e8f0;
  font-family: var(--mono);
  font-size: 0.66rem;
  line-height: 1.6;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.tv-doc {
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: 9px;
  background: var(--surface);
}

.tv-doc__bar {
  height: 10px;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--accent-border), var(--accent));
}

.tv-chunks {
  display: grid;
  gap: 6px;
  margin-top: 10px;
}

.tv-chunk {
  position: relative;
  height: 26px;
  overflow: hidden;
  border: 1px solid var(--accent-border);
  border-radius: 6px;
  background: var(--accent-soft);
}

.tv-chunk span {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  padding-left: 8px;
  color: var(--accent-strong);
  font-size: 0.61rem;
  font-weight: 700;
}

.tv-chunk--2 {
  width: 92%;
  margin-left: 8%;
}

.tv-chunk--3 {
  width: 84%;
  margin-left: 16%;
}

.tv-vector {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: 4px;
}

.tv-vector span {
  display: grid;
  place-items: center;
  height: 28px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.55rem;
}

.tv-vector span:nth-child(3n) {
  border-color: var(--accent-border);
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.tv-store {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 10px;
}

.tv-store__box {
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
}

.tv-store__box strong {
  display: block;
  font-size: 0.72rem;
}

.tv-store__box span {
  display: block;
  margin-top: 2px;
  color: var(--muted);
  font-size: 0.64rem;
  line-height: 1.4;
}

.tv-ranks {
  display: grid;
  gap: 7px;
}

.tv-rank {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 8px;
  align-items: center;
  padding: 9px;
  border: 1px solid var(--border);
  border-radius: 9px;
  background: var(--surface);
}

.tv-rank__num {
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 7px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 0.7rem;
  font-weight: 800;
}

.tv-rank strong {
  display: block;
  font-size: 0.72rem;
}

.tv-rank span {
  display: block;
  color: var(--muted);
  font-size: 0.61rem;
}

.tv-source {
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 9px;
  background: var(--surface);
}

.tv-source + .tv-source {
  margin-top: 7px;
}

.tv-source strong {
  display: block;
  font-size: 0.72rem;
}

.tv-source span {
  display: block;
  margin-top: 2px;
  color: var(--muted);
  font-size: 0.61rem;
}

.tv-source p {
  margin-top: 5px;
  color: var(--text-soft);
  font-size: 0.65rem;
  line-height: 1.45;
}

.tv-arch {
  display: grid;
  gap: 12px;
}

.tv-lane {
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
}

.tv-lane__label {
  margin-bottom: 8px;
  color: var(--accent-strong);
  font-size: 0.6rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.tv-lane__flow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 5px;
}

.tv-lane__node {
  padding: 5px 7px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface-2);
  font-size: 0.58rem;
  font-weight: 650;
}

.tv-lane__arrow {
  color: var(--muted);
  font-size: 0.68rem;
}

/* ------------------------------------------------------------- app mockups */

.app-mock {
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

.app-mock__bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
  background: var(--surface-2);
}

.app-mock__bar > span {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--border-strong);
}

.app-mock__bar strong {
  margin-left: auto;
  color: var(--muted);
  font-size: 0.58rem;
  font-weight: 700;
}

.app-mock__body {
  padding: 10px;
}

.app-mock__layout {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 8px;
}

.app-mock__col {
  display: grid;
  gap: 8px;
  align-content: start;
}

.app-mock__panel {
  padding: 9px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface-2);
}

.app-mock__panel + .app-mock__panel {
  margin-top: 8px;
}

.app-mock__layout .app-mock__panel + .app-mock__panel {
  margin-top: 0;
}

.app-mock__panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
}

.app-mock__label {
  color: var(--muted);
  font-size: 0.58rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.app-mock__pill {
  padding: 2px 5px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  font-size: 0.52rem;
  font-weight: 700;
  white-space: nowrap;
}

.app-mock__drop {
  margin-top: 7px;
  padding: 14px 8px;
  border: 1px dashed var(--border-strong);
  border-radius: 7px;
  background: var(--surface);
  color: var(--muted);
  font-size: 0.62rem;
  line-height: 1.5;
  text-align: center;
}

.app-mock__drop strong {
  display: block;
  color: var(--text);
  font-size: 0.68rem;
}

.app-mock__drop--active {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.app-mock__buttons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5px;
  margin-top: 7px;
}

.app-mock__btn {
  display: grid;
  place-items: center;
  min-height: 22px;
  padding: 3px 6px;
  border: 1px solid var(--border);
  border-radius: 5px;
  background: var(--surface);
  color: var(--muted);
  font-size: 0.55rem;
  font-weight: 700;
}

.app-mock__btn--primary {
  border-color: var(--accent-border);
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.app-mock__progress {
  height: 5px;
  margin-top: 8px;
  overflow: hidden;
  border-radius: 999px;
  background: var(--surface-3);
}

.app-mock__progress span {
  display: block;
  width: 62%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
}

.app-mock__toolbar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding-bottom: 7px;
  border-bottom: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.56rem;
  font-weight: 700;
}

.app-mock__refresh {
  margin-left: auto;
  color: var(--muted);
}

.app-mock__row {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 7px 0;
  border-bottom: 1px solid var(--border);
}

.app-mock__row:last-child {
  border-bottom: 0;
}

.app-mock__row--active {
  margin-inline: -4px;
  padding-inline: 4px;
  border-radius: 5px;
  background: var(--accent-soft);
}

.app-mock__check {
  flex: 0 0 auto;
  width: 11px;
  height: 11px;
  border: 1px solid var(--border-strong);
  border-radius: 3px;
  background: var(--surface);
}

.app-mock__check--on {
  border-color: var(--accent);
  background: var(--accent);
}

.app-mock__file {
  min-width: 0;
  flex: 1;
}

.app-mock__file strong {
  display: block;
  overflow: hidden;
  font-size: 0.64rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.app-mock__file span {
  display: block;
  color: var(--muted);
  font-size: 0.56rem;
}

.app-mock__badge {
  flex: 0 0 auto;
  padding: 1px 4px;
  border-radius: 3px;
  background: var(--surface-3);
  color: var(--muted);
  font-size: 0.48rem;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.app-mock__trash {
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  border-radius: 4px;
  background: var(--danger-soft);
  color: var(--danger);
}

.app-mock__trash svg {
  width: 10px;
  height: 10px;
}

.app-mock__scope {
  margin-top: 7px;
  padding: 5px 6px;
  border-radius: 5px;
  background: var(--surface);
  color: var(--accent-strong);
  font-size: 0.55rem;
  font-weight: 700;
}

.app-mock__composer {
  margin-top: 8px;
  padding: 8px;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  background: var(--surface);
}

.app-mock__composer--focus {
  border-color: var(--accent);
  box-shadow: var(--focus);
}

.app-mock__composer > p {
  color: var(--text-soft);
  font-size: 0.64rem;
  line-height: 1.5;
}

.app-mock__composer > p.app-mock__placeholder {
  color: var(--muted);
}

.app-mock__composer-bar {
  display: flex;
  align-items: center;
  gap: 5px;
  margin-top: 8px;
}

.app-mock__composer-bar > span:first-child {
  margin-right: auto;
  color: var(--muted);
  font-size: 0.5rem;
}

.app-mock__send {
  padding: 3px 8px;
  border-radius: 5px;
  background: var(--accent);
  color: #fff;
  font-size: 0.54rem;
  font-weight: 700;
}

.app-mock__message {
  display: flex;
  gap: 6px;
}

.app-mock__avatar {
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  border-radius: 5px;
  background: var(--accent);
  color: #fff;
  font-size: 0.46rem;
  font-weight: 800;
}

.app-mock__bubble {
  flex: 1;
  min-width: 0;
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--surface-2);
  color: var(--text-soft);
  font-size: 0.62rem;
  line-height: 1.5;
}

.app-mock__sources {
  margin-top: 6px;
  padding-top: 6px;
  border-top: 1px solid var(--border);
  color: var(--accent-strong);
  font-size: 0.56rem;
  font-weight: 700;
}

.app-mock__source {
  margin-top: 5px;
  padding: 6px;
  border: 1px solid var(--border);
  border-radius: 5px;
  background: var(--surface);
}

.app-mock__source strong {
  display: block;
  font-size: 0.58rem;
}

.app-mock__source span {
  display: block;
  color: var(--muted);
  font-size: 0.52rem;
}

.app-mock__source p {
  margin-top: 3px;
  color: var(--muted);
  font-size: 0.54rem;
  line-height: 1.4;
}

.app-mock__callout {
  margin-top: 8px;
  padding: 7px 8px;
  border: 1px solid var(--warning-border);
  border-radius: 7px;
  background: var(--warning-soft);
  color: var(--warning);
  font-size: 0.58rem;
  line-height: 1.45;
}

/* ---------------------------------------------------------------- about page */

.about-hero {
  padding: 64px 0 38px;
}

.about-hero h1 {
  max-width: 940px;
  margin-top: 16px;
  font-size: clamp(2rem, 4.1vw, 3.2rem);
  letter-spacing: -0.045em;
  line-height: 1.08;
}

.about-hero p {
  max-width: 740px;
  margin-top: 16px;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.72;
}

.about-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin-top: 22px;
}

.about-fact {
  padding: 6px 11px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  font-size: 0.74rem;
  font-weight: 600;
}

.prose {
  max-width: 840px;
}

.prose p {
  color: var(--text-soft);
  font-size: 0.95rem;
  line-height: 1.78;
}

.prose p + p {
  margin-top: 14px;
}

.pull-quote {
  margin: 24px 0 0;
  padding: 18px 22px;
  border-left: 3px solid var(--accent);
  border-radius: 0 12px 12px 0;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.65;
}

.arch-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.65fr);
  gap: 20px;
  align-items: start;
}

.arch-canvas {
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

.arch-lane + .arch-lane {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
}

.arch-lane__title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.arch-lane__title span {
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  border-radius: 6px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 0.62rem;
}

.arch-flow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 7px;
}

.arch-node {
  padding: 7px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface-2);
  color: var(--text-soft);
  font-size: 0.71rem;
  font-weight: 650;
  text-align: left;
  transition: background 140ms ease, border-color 140ms ease, color 140ms ease;
}

.arch-node:hover {
  border-color: var(--accent-border);
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.arch-node[aria-pressed="true"] {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent-strong);
  box-shadow: var(--focus);
}

.arch-arrow {
  color: var(--border-strong);
  font-size: 0.8rem;
}

.arch-detail {
  position: sticky;
  top: calc(var(--header-h) + 16px);
  min-height: 230px;
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

.arch-detail__kicker {
  color: var(--accent-strong);
  font-size: 0.62rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.arch-detail h3 {
  margin-top: 5px;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
}

.arch-detail > p {
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.65;
}

.arch-detail dl {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 6px 10px;
  margin: 14px 0 0;
  font-size: 0.74rem;
}

.arch-detail dt {
  color: var(--muted);
  font-weight: 700;
}

.arch-detail dd {
  margin: 0;
  color: var(--text-soft);
}

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

.module-card {
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

.module-card code {
  display: inline-block;
  padding: 2px 6px;
  border-radius: 5px;
  background: var(--surface-3);
  color: var(--accent-strong);
  font-family: var(--mono);
  font-size: 0.72rem;
}

.module-card h3 {
  margin-top: 8px;
  font-size: 0.92rem;
  letter-spacing: -0.01em;
}

.module-card p {
  margin-top: 6px;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.62;
}

.decision-list {
  display: grid;
  gap: 10px;
  max-width: 940px;
}

.decision {
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
}

.decision summary {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 15px 18px;
  font-size: 0.9rem;
  font-weight: 650;
  list-style: none;
  cursor: pointer;
}

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

.decision summary::after {
  content: "+";
  margin-left: auto;
  color: var(--muted);
  font-size: 1.15rem;
  line-height: 1;
}

.decision[open] summary::after {
  content: "−";
}

.decision__body {
  padding: 0 18px 18px;
  color: var(--text-soft);
  font-size: 0.85rem;
  line-height: 1.72;
}

.decision__body p + p {
  margin-top: 10px;
}

.decision__tag {
  flex: 0 0 auto;
  padding: 2px 7px;
  border-radius: 999px;
  font-size: 0.58rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.decision__tag--doc {
  background: var(--success-soft);
  color: var(--success);
}

.decision__tag--design {
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.check-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  display: flex;
  gap: 10px;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  color: var(--text-soft);
  font-size: 0.85rem;
  line-height: 1.5;
}

.check-list li::before {
  content: "✓";
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--success-soft);
  color: var(--success);
  font-size: 0.7rem;
  font-weight: 800;
}

.two-col {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.info-panel {
  padding: 22px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface);
}

.info-panel h3 {
  font-size: 1rem;
  letter-spacing: -0.015em;
}

.info-panel ul {
  margin: 12px 0 0;
  padding-left: 18px;
  color: var(--text-soft);
  font-size: 0.85rem;
  line-height: 1.75;
}

.info-panel li + li {
  margin-top: 4px;
}

.info-panel--future {
  border-style: dashed;
  background: var(--surface-2);
}

.info-panel__label {
  display: inline-block;
  margin-bottom: 8px;
  padding: 2px 7px;
  border-radius: 999px;
  background: var(--warning-soft);
  color: var(--warning);
  font-size: 0.6rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.credit-card {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 26px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: linear-gradient(135deg, var(--surface), var(--accent-soft));
  box-shadow: var(--shadow-sm);
}

.credit-avatar {
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  width: 64px;
  height: 64px;
  border-radius: 18px;
  background: linear-gradient(145deg, var(--accent), var(--accent-2));
  color: #fff;
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.credit-card h3 {
  font-size: 1.1rem;
  letter-spacing: -0.02em;
}

.credit-card p {
  margin-top: 4px;
  color: var(--muted);
  font-size: 0.84rem;
  line-height: 1.6;
}

.credit-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

/* ------------------------------------------------------------- responsive */

@media (max-width: 1100px) {
  .hero__grid {
    grid-template-columns: 1fr;
    gap: 44px;
  }

  .hero__lede {
    max-width: 640px;
  }

  .hero-visual {
    max-width: 580px;
    margin-inline: auto;
  }

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

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

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

  .pipeline-step::after {
    display: none;
  }

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

  .arch-detail {
    position: static;
    min-height: 0;
  }
}

@media (max-width: 900px) {
  .nav-toggle {
    display: inline-grid;
  }

  .site-nav {
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    margin-left: 0;
    padding: 12px 24px 20px;
    border-bottom: 1px solid var(--border);
    background: var(--surface);
    box-shadow: var(--shadow);
  }

  .site-header.is-open .site-nav {
    display: flex;
  }

  .site-nav a:not(.btn) {
    padding: 11px 12px;
  }

  .site-nav .btn {
    margin: 6px 0 0;
  }

  .site-brand__text span {
    display: none;
  }

  .site-header__inner {
    gap: 12px;
  }

  .site-tools {
    margin-left: auto;
  }

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

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

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 760px) {
  .container {
    width: calc(100% - 32px);
  }

  .hero {
    padding: 48px 0 44px;
  }

  .section {
    padding: 56px 0;
  }

  .section-head {
    margin-bottom: 30px;
  }

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

  .module-grid,
  .two-col,
  .check-list {
    grid-template-columns: 1fr;
  }

  .tour-body {
    grid-template-columns: 1fr;
    overflow-y: auto;
  }

  .tour-copy,
  .tour-visual {
    overflow: visible;
  }

  .tour-visual {
    border-top: 1px solid var(--border);
    border-left: 0;
  }

  .tour-dialog {
    width: calc(100vw - 16px);
    max-height: calc(100dvh - 16px);
  }

  .tour-shell {
    max-height: calc(100dvh - 16px);
  }

  .tour-head,
  .tour-progress,
  .tour-foot {
    padding-inline: 18px;
  }

  .tour-copy,
  .tour-visual {
    padding: 18px;
  }

  .credit-card {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 620px) {
  .feature-grid {
    grid-template-columns: 1fr;
  }

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

  .github-link {
    width: 38px;
    padding: 0;
  }

  .github-link span {
    display: none;
  }

  .site-brand__text {
    display: none;
  }

  .hero__actions .btn,
  .cta-band__actions .btn {
    flex: 1 1 100%;
  }

  .tour-facts {
    grid-template-columns: 1fr;
  }

  .tour-foot {
    align-items: stretch;
    flex-direction: column-reverse;
  }

  .tour-nav {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .tour-foot > .btn {
    width: 100%;
  }

  .skip-panel {
    align-items: stretch;
    flex-direction: column;
  }

  .skip-panel .btn {
    width: 100%;
  }

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

  .footer-brand {
    grid-column: auto;
  }

  .about-fact {
    font-size: 0.7rem;
  }
}

@media (max-width: 460px) {
  .tech-grid {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: 2.15rem;
  }

  .hv-body {
    padding: 12px;
  }

  .tour-head h2 {
    font-size: 1.08rem;
  }

  .tour-complete {
    padding: 40px 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  html.js [data-reveal] {
    opacity: 1;
    transform: none;
  }
}

/* ==========================================================================
   Finishing pieces added with the page build
   ========================================================================== */

.tour-lead {
  margin-bottom: 18px;
  color: var(--text);
  font-size: 0.98rem;
  font-weight: 550;
  line-height: 1.65;
}

.tour-status[data-minutes]::before {
  display: none;
}

.skip-panel__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tech-icon {
  color: var(--accent-strong);
  font-size: 0.62rem;
  font-weight: 800;
  letter-spacing: 0.03em;
}

.arch-detail code,
.arch-detail dd code {
  padding: 1px 5px;
  border-radius: 4px;
  background: var(--surface-3);
  font-family: var(--mono);
  font-size: 0.7rem;
  overflow-wrap: anywhere;
}

.arch-detail dl {
  align-items: start;
}

.app-mock__empty {
  padding: 12px 10px;
  border: 1px dashed var(--border-strong);
  border-radius: 7px;
  background: var(--surface);
  text-align: center;
}

.app-mock__empty strong {
  display: block;
  font-size: 0.66rem;
}

.app-mock__empty span {
  display: block;
  margin-top: 3px;
  color: var(--muted);
  font-size: 0.56rem;
  line-height: 1.45;
}

.app-mock__message--user {
  justify-content: flex-end;
}

.app-mock__message--user .app-mock__bubble {
  flex: 0 1 auto;
  border-color: var(--accent-border);
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.app-mock__message--user .app-mock__avatar {
  background: var(--surface-3);
  color: var(--muted);
}

.tour-dialog[open] {
  animation: tour-in 180ms ease-out;
}

@keyframes tour-in {
  from {
    opacity: 0;
    transform: translateY(10px) scale(0.99);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@media (max-width: 460px) {
  .app-mock__layout {
    grid-template-columns: 1fr;
  }

  .skip-panel__actions {
    flex-direction: column;
  }

  .skip-panel__actions .btn {
    width: 100%;
  }
}