/* ==========================================================================
   Unwrap Documentation — docs.css
   Design tokens: design-guidelines.md
   VARIANCE=8, DENSITY=4, MOTION=6
   ========================================================================== */

/* ── Fonts ──────────────────────────────────────────────────────────────── */
/* Satoshi + JetBrains Mono loaded via <link> in HTML */

/* ── Reset ──────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  scroll-behavior: smooth;
  /* Anchor jumps land below the fixed 56px topbar, with 24px breathing. */
  scroll-padding-top: calc(var(--topbar-h) + 24px);
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}

/* ── Design tokens ──────────────────────────────────────────────────────── */
:root {
  /* Backgrounds */
  --bg-base:     #09090B;
  --bg-surface:  #111114;
  --bg-elevated: #18181B;
  --bg-overlay:  #27272A;

  /* Borders */
  --border-subtle:  rgba(63, 63, 70, 0.35);
  --border-default: #27272A;
  --border-strong:  #3F3F46;

  /* Text */
  --text-primary:   #F4F4F5;
  --text-secondary: #A1A1AA;
  --text-tertiary:  #71717A;
  --text-disabled:  #52525B;

  /* Accent */
  --accent:         #10B981;
  --accent-strong:  #059669;
  --accent-muted:   rgba(16, 185, 129, 0.12);
  --accent-glow:    rgba(16, 185, 129, 0.20);

  /* Semantic */
  --danger:  #EF4444;
  --warning: #F59E0B;

  /* Layout */
  --topbar-h:    56px;
  --sidebar-w:   240px;
  --content-w:   920px;
  --layout-max: 1280px;

  /* Typography
     Plus Jakarta Sans chosen for strong Vietnamese diacritic rendering
     (better than Satoshi on stacked accents like ặ, ầ, ợ). */
  --font-ui:   'Plus Jakarta Sans', ui-sans-serif, system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;

  /* Radius */
  --r-sm: 4px;
  --r-md: 6px;
  --r-lg: 8px;
  --r-xl: 12px;
}

/* ── Base ───────────────────────────────────────────────────────────────── */
body {
  background: var(--bg-base);
  color: var(--text-primary);
  font-family: var(--font-ui);
  font-size: 15px;
  line-height: 26px;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  min-height: 100dvh;
}

/* ── Topbar ─────────────────────────────────────────────────────────────── */
.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--topbar-h);
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-default);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  z-index: 100;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: -0.01em;
}

.brand img {
  display: block;
  flex-shrink: 0;
}

/* ── Language switcher ──────────────────────────────────────────────────── */
.lang-switcher {
  display: flex;
  align-items: center;
  gap: 4px;
}

.lang-switcher button {
  height: 28px;
  padding: 0 10px;
  border-radius: var(--r-md);
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: color 120ms, background 120ms, border-color 120ms;
}

.lang-switcher button:hover {
  color: var(--text-primary);
  background: var(--bg-overlay);
}

.lang-switcher button[aria-pressed="true"] {
  color: var(--accent);
  background: var(--accent-muted);
  border-color: rgba(16, 185, 129, 0.30);
}

/* ── Layout ─────────────────────────────────────────────────────────────── */
.layout {
  display: flex;
  padding-top: var(--topbar-h);
  min-height: 100dvh;
  max-width: var(--layout-max);
  margin: 0 auto;
}

/* ── TOC sidebar ────────────────────────────────────────────────────────── */
.toc {
  position: sticky;
  top: var(--topbar-h);
  height: calc(100dvh - var(--topbar-h));
  width: var(--sidebar-w);
  flex-shrink: 0;
  overflow-y: auto;
  padding: 32px 0 32px 24px;
  border-right: 1px solid var(--border-subtle);
  /* Custom scrollbar */
  scrollbar-width: thin;
  scrollbar-color: var(--border-default) transparent;
}

.toc::-webkit-scrollbar { width: 6px; }
.toc::-webkit-scrollbar-thumb { background: var(--border-default); border-radius: 3px; }
.toc::-webkit-scrollbar-track { background: transparent; }

/* Mobile toggle — hidden on desktop */
.toc-toggle {
  display: none;
}

.toc ol {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.toc a {
  display: block;
  padding: 5px 12px 5px 10px;
  border-radius: var(--r-md);
  font-size: 13px;
  line-height: 20px;
  font-weight: 450;
  color: var(--text-secondary);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color 120ms, background 120ms, border-color 120ms;
}

.toc a:hover {
  color: var(--text-primary);
  background: var(--bg-elevated);
}

.toc a.toc-active {
  color: var(--accent);
  border-left-color: var(--accent);
  background: var(--accent-muted);
}

/* ── Main content ───────────────────────────────────────────────────────── */
main {
  flex: 1;
  min-width: 0;
  padding: 48px 32px 80px;
}

main > * + * {
  margin-top: 64px;
}

/* ── Sections ───────────────────────────────────────────────────────────── */
section {
  max-width: var(--content-w);
}

section h2 {
  font-size: 20px;
  line-height: 26px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text-primary);
  margin-bottom: 16px;
}

section > p {
  color: var(--text-secondary);
  margin-bottom: 24px;
}

section + section {
  padding-top: 0;
}

/* ── Hero ───────────────────────────────────────────────────────────────── */
.hero {
  padding-top: 16px;
  padding-bottom: 16px;
}

.hero .eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}

.hero h1 {
  font-size: 36px;
  line-height: 42px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.hero .tagline {
  font-size: 16px;
  line-height: 24px;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.hero-screenshot {
  display: block;
  width: 100%;
  max-width: var(--content-w);
  border-radius: var(--r-xl);
  border: 1px solid var(--border-default);
  background: var(--bg-surface);
  box-shadow: 0 24px 48px -24px rgba(0, 0, 0, 0.6);
}

/* ── Feature grid ───────────────────────────────────────────────────────── */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 24px;
}

.feature-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--r-lg);
  padding: 20px;
}

.feature-card .icon {
  font-size: 20px;
  color: var(--accent);
  display: block;
  margin-bottom: 12px;
}

.feature-card h3 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.feature-card p {
  font-size: 13px;
  line-height: 20px;
  color: var(--text-secondary);
}

/* ── Diagram figures ────────────────────────────────────────────────────── */
.diagram-figure {
  margin: 24px 0;
  border: 1px solid var(--border-subtle);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--bg-surface);
}

.diagram-img {
  display: block;
  width: 100%;
  height: auto;
  margin-bottom: 20px;
}

.diagram-figure figcaption {
  padding: 10px 16px;
  font-size: 12px;
  line-height: 18px;
  color: var(--text-tertiary);
  border-top: 1px solid var(--border-subtle);
}

/* ── Callout list ───────────────────────────────────────────────────────── */
.callout-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 16px;
}

.callout-list li {
  padding: 10px 14px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--r-md);
  font-size: 13px;
  line-height: 20px;
  color: var(--text-secondary);
}

.callout-list li::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  margin-right: 10px;
  vertical-align: middle;
  flex-shrink: 0;
}

/* ── Workflow steps ─────────────────────────────────────────────────────── */
.workflow-step {
  margin-top: 32px;
  padding-top: 28px;
  border-top: 1px solid var(--border-subtle);
}

.workflow-step:first-of-type {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}

.workflow-step h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 14px;
  letter-spacing: -0.005em;
}

.step-list {
  list-style: none;
  counter-reset: steps;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 20px;
}

.step-list li {
  counter-increment: steps;
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-size: 13px;
  line-height: 20px;
  color: var(--text-secondary);
}

.step-list li::before {
  content: counter(steps);
  min-width: 20px;
  height: 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-muted);
  color: var(--accent);
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 1px;
}

/* ── How-to-use screens ─────────────────────────────────────────────────── */
.screens-list {
  display: flex;
  flex-direction: column;
  gap: 48px;
  margin-top: 24px;
}

.screen-article {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 32px;
  align-items: center;
}

/* Alternate image side via `order` (cleaner than direction:rtl trick).
   Even-indexed rows put the figure on the left. */
.screen-article:nth-child(even) .screen-figure {
  order: -1;
}

.screen-text h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.screen-text p {
  font-size: 13px;
  line-height: 20px;
  color: var(--text-secondary);
}

.screen-figure {
  margin: 0;
}

.screen-screenshot {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: var(--r-lg);
  border: 1px solid var(--border-default);
  background: var(--bg-surface);
}

/* ── Tech stack groups ──────────────────────────────────────────────────── */
.techstack-groups {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 24px;
}

.techstack-group {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--r-lg);
  padding: 16px 20px;
}

.techstack-group h4 {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 8px;
}

.techstack-tools {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 20px;
  color: var(--text-secondary);
}

/* ── Shortcuts table ────────────────────────────────────────────────────── */
.shortcuts-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 20px;
}

.shortcuts-table th {
  text-align: left;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  padding: 0 12px 10px;
  border-bottom: 1px solid var(--border-default);
}

.shortcuts-table td {
  padding: 10px 12px;
  font-size: 13px;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-subtle);
  vertical-align: middle;
}

.shortcuts-table tr:last-child td {
  border-bottom: none;
}

.shortcuts-table kbd {
  display: inline-block;
  padding: 2px 7px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--r-sm);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  color: var(--text-primary);
  white-space: nowrap;
}

/* ── Bundled tools table ────────────────────────────────────────────────── */
.bundled-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 20px;
}

.bundled-table th {
  text-align: left;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  padding: 0 12px 10px;
  border-bottom: 1px solid var(--border-default);
}

.bundled-table td {
  padding: 10px 12px;
  font-size: 13px;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-subtle);
  vertical-align: middle;
}

.bundled-table tr:last-child td {
  border-bottom: none;
}

.bundled-table code {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 2px 6px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--r-sm);
  color: var(--accent);
}

/* ── Q&A troubleshoot ───────────────────────────────────────────────────── */
.qa-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: 20px;
}

.qa-item {
  padding: 20px 0;
  border-bottom: 1px solid var(--border-subtle);
}

.qa-item:last-child {
  border-bottom: none;
}

.qa-item dt {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.qa-item dd {
  font-size: 13px;
  line-height: 20px;
  color: var(--text-secondary);
  margin-left: 0;
}

/* ── Footer ─────────────────────────────────────────────────────────────── */
footer {
  max-width: calc(var(--sidebar-w) + var(--content-w) + 64px);
  margin: 0 auto;
  padding: 24px 32px 40px;
  font-size: 12px;
  color: var(--text-tertiary);
  border-top: 1px solid var(--border-subtle);
}

footer a {
  color: var(--accent);
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

/* ── Error banner ───────────────────────────────────────────────────────── */
.banner-error {
  position: fixed;
  top: var(--topbar-h);
  left: 0;
  right: 0;
  z-index: 200;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--danger);
  padding: 12px 24px;
  font-size: 13px;
  line-height: 20px;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.banner-error code {
  font-family: var(--font-mono);
  font-size: 12px;
  background: var(--bg-base);
  border: 1px solid var(--border-default);
  border-radius: var(--r-sm);
  padding: 1px 6px;
  color: var(--accent);
}

.banner-error strong {
  color: var(--danger);
  font-weight: 600;
}

.banner-dismiss {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: transparent;
  color: var(--text-tertiary);
  cursor: pointer;
  border-radius: var(--r-sm);
  transition: color 120ms, background 120ms;
}

.banner-dismiss:hover {
  color: var(--text-primary);
  background: var(--bg-overlay);
}

/* ── Focus rings (accessibility) ────────────────────────────────────────── */
:focus-visible {
  outline: 2px solid var(--accent-glow);
  outline-offset: 2px;
}

/* ── Mobile (< 900px) ───────────────────────────────────────────────────── */
@media (max-width: 900px) {
  .toc {
    position: static;
    height: auto;
    width: 100%;
    border-right: none;
    border-bottom: 1px solid var(--border-subtle);
    padding: 0;
    overflow: hidden;
  }

  .toc-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    padding: 12px 20px;
    background: var(--bg-surface);
    border: none;
    color: var(--text-secondary);
    font-family: var(--font-ui);
    font-size: 13px;
    cursor: pointer;
    transition: color 120ms;
  }

  .toc-toggle:hover { color: var(--text-primary); }

  .toc-toggle .toc-caret {
    margin-left: auto;
    transition: transform 200ms ease;
  }

  .toc-toggle[aria-expanded="true"] .toc-caret {
    transform: rotate(180deg);
  }

  .toc ol {
    padding: 8px 20px 16px;
    display: none;
  }

  .toc.toc-open ol {
    display: flex;
  }

  .layout {
    flex-direction: column;
  }

  main {
    padding: 32px 20px 60px;
  }

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

  .screen-article,
  .screen-article:nth-child(even) {
    grid-template-columns: 1fr;
    direction: ltr;
  }

  .hero h1 {
    font-size: 28px;
    line-height: 34px;
  }
}

@media (max-width: 500px) {
  .topbar { padding: 0 16px; }
  main { padding: 24px 16px 48px; }
}

/* ── Lightbox (click-to-enlarge images) ─────────────────────────────────── */

/* Hover affordance on main images */
main img:not(.no-zoom) {
  cursor: zoom-in;
  transition: border-color 160ms ease, box-shadow 160ms ease;
}
main img:not(.no-zoom):hover {
  border-color: var(--border-strong);
}

/* Modal */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(9, 9, 11, 0.92);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  justify-content: stretch;
  padding: 64px 32px 56px;
  opacity: 0;
  visibility: hidden;
  transform: scale(0.96);
  transition: opacity 180ms ease, transform 180ms ease, visibility 180ms;
}

.lightbox-open {
  opacity: 1;
  visibility: visible;
  transform: scale(1);
}

.lightbox-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-default);
  background: var(--bg-surface);
  color: var(--text-secondary);
  border-radius: var(--r-md);
  cursor: pointer;
  font-size: 18px;
  transition: color 120ms, background 120ms, border-color 120ms;
}
.lightbox-close:hover {
  color: var(--text-primary);
  background: var(--bg-overlay);
  border-color: var(--border-strong);
}
.lightbox-close:focus-visible {
  outline: 2px solid var(--accent-glow);
  outline-offset: 2px;
}

.lightbox-stage {
  flex: 1;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  cursor: grab;
}
.lightbox-stage:active { cursor: grabbing; }

.lightbox-pan {
  display: flex;
  align-items: center;
  justify-content: center;
  /* panzoom applies transform to this element; user-select off prevents drag-select */
  user-select: none;
  -webkit-user-select: none;
  will-change: transform;
}

.lightbox-img {
  display: block;
  max-width: min(92vw, 1600px);
  max-height: 84vh;
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: var(--r-md);
  background: var(--bg-surface);
  /* Hint to user that drag works */
  pointer-events: none; /* panzoom handles events on parent */
}

.lightbox-caption {
  text-align: center;
  padding-top: 16px;
  font-size: 13px;
  line-height: 18px;
  color: var(--text-secondary);
  max-width: 720px;
  margin: 0 auto;
}

/* Reduced-motion: instant open/close */
@media (prefers-reduced-motion: reduce) {
  .lightbox { transition: opacity 1ms, visibility 1ms; transform: none; }
  .lightbox-open { transform: none; }
}

/* Mobile tweaks */
@media (max-width: 640px) {
  .lightbox { padding: 56px 12px 40px; }
  .lightbox-close { top: 12px; right: 12px; width: 36px; height: 36px; }
  .lightbox-img { max-height: 72vh; }
}