/* ================================================================
 * Visual Diff Lab — styles
 * Design direction: editorial × precision-instrument
 *   - Type: Newsreader (display) / IBM Plex Sans (body) / JetBrains Mono (code)
 *   - Palette: paper white + deep navy + vivid vermilion accent
 *   - Geometry: rules, sharp corners (4px max), wide measure
 * ============================================================== */

:root {
  color-scheme: light dark;

  /* Brand */
  --paper: #f4f1ec;
  --paper-2: #ebe7df;
  --ink: #1a2332;
  --ink-2: #2a3344;
  --muted: #5a6473;
  --rule: #c8c2b8;
  --rule-soft: #ddd6cb;
  --accent: #e63946;
  --accent-warm: #d62828;
  --good: #2a9d8f;

  /* Surfaces */
  --bg: var(--paper);
  --surface: #ffffff;
  --surface-2: var(--paper-2);
  --text: var(--ink);
  --text-soft: var(--muted);
  --border: var(--rule);
  --border-soft: var(--rule-soft);

  /* Type */
  --font-display: "Newsreader", Georgia, "Times New Roman", serif;
  --font-body: "IBM Plex Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Consolas, monospace;

  /* Layout */
  --max-w: 1320px;
  --gutter: clamp(16px, 4vw, 32px);

  /* Shadow */
  --shadow-1: 0 1px 0 rgba(26, 35, 50, 0.06), 0 1px 2px rgba(26, 35, 50, 0.04);
  --shadow-2: 0 6px 24px rgba(26, 35, 50, 0.08);
}

[data-theme="dark"] {
  --bg: #0f141c;
  --surface: #161d28;
  --surface-2: #1d2533;
  --text: #ece7df;
  --text-soft: #8a93a3;
  --border: #2a3344;
  --border-soft: #1f2734;
  --rule: #2a3344;
  --rule-soft: #1f2734;
  --shadow-1: 0 1px 0 rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-2: 0 8px 28px rgba(0, 0, 0, 0.5);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
  text-decoration: none;
}

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

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
}

code, kbd {
  font-family: var(--font-mono);
  font-size: 0.92em;
  background: var(--surface-2);
  padding: 0.1em 0.4em;
  border-radius: 3px;
}

.skip-link {
  position: absolute;
  top: -40px;
  left: 12px;
  background: var(--ink);
  color: var(--paper);
  padding: 8px 14px;
  z-index: 100;
}
.skip-link:focus {
  top: 12px;
}

/* === Layout primitives === */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding-inline: var(--gutter);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-soft);
}
.eyebrow-dot {
  width: 6px;
  height: 6px;
  background: var(--accent);
  display: inline-block;
}

.section-head {
  display: flex;
  align-items: baseline;
  gap: 18px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 14px;
  margin-bottom: 32px;
}

.section-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-soft);
  margin: 0;
  white-space: nowrap;
}

.section-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.6rem, 3.2vw, 2.4rem);
  margin: 0;
  letter-spacing: -0.01em;
  line-height: 1.15;
}

/* === Header === */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--border-soft);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-block: 14px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
}
.brand-mark {
  width: 26px;
  height: 26px;
  color: var(--text);
}
.brand-name {
  display: flex;
  align-items: baseline;
  gap: 6px;
}
.brand-display {
  font-family: var(--font-display);
  font-weight: 600;
  font-style: italic;
  font-size: 1.18rem;
  letter-spacing: -0.01em;
}
.brand-sub {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-soft);
}
.nav {
  display: inline-flex;
  align-items: center;
  gap: 22px;
}
.nav a {
  font-size: 0.92rem;
  color: var(--text-soft);
  position: relative;
}
.nav a:hover {
  color: var(--text);
}
.theme-toggle {
  width: 34px;
  height: 34px;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 4px;
  font-size: 1rem;
  display: inline-grid;
  place-items: center;
}
.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}

@media (max-width: 720px) {
  .nav { gap: 14px; }
  .nav a { font-size: 0.86rem; }
}
@media (max-width: 540px) {
  .nav a:not(:last-child) { display: none; }
}

/* === Hero === */
.hero {
  border-bottom: 1px solid var(--border);
  padding-block: clamp(48px, 9vw, 96px);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--border-soft) 1px, transparent 1px);
  background-size: 64px 64px;
  background-position: -1px -1px;
  opacity: 0.4;
  mask-image: radial-gradient(ellipse at 70% 30%, black, transparent 70%);
  pointer-events: none;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  gap: clamp(28px, 5vw, 64px);
  align-items: center;
  position: relative;
}
@media (max-width: 880px) {
  .hero-inner { grid-template-columns: 1fr; }
}

.hero-text .eyebrow {
  margin-bottom: 22px;
}
.hero-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2.2rem, 5.4vw, 4.2rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0 0 24px;
}
.hero-title-line {
  display: block;
}
.hero-title em {
  font-style: italic;
  color: var(--accent);
  font-weight: 400;
}

.hero-lede {
  font-size: 1.04rem;
  color: var(--text-soft);
  max-width: 56ch;
  margin: 0 0 28px;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 28px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 22px;
  border: 1px solid var(--text);
  background: var(--text);
  color: var(--bg);
  font-weight: 500;
  letter-spacing: 0.01em;
  border-radius: 2px;
  transition: transform 120ms ease, background 160ms ease, color 160ms ease;
}
.btn:hover {
  transform: translateY(-1px);
}
.btn-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.btn-primary:hover {
  background: var(--accent-warm);
  color: #fff;
  border-color: var(--accent-warm);
}
.btn-ghost {
  background: transparent;
  color: var(--text);
}
.btn-ghost:hover {
  background: var(--text);
  color: var(--bg);
}

.hero-meta {
  list-style: none;
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  padding: 16px 0 0;
  margin: 0;
  border-top: 1px solid var(--border-soft);
  font-size: 0.86rem;
  color: var(--text-soft);
  font-family: var(--font-mono);
}
.hero-meta strong { color: var(--text); font-weight: 500; }

.hero-figure {
  position: relative;
}
.hero-figure-frame {
  position: relative;
  border: 1px solid var(--border);
  background: var(--surface);
  aspect-ratio: 4 / 3;
  box-shadow: var(--shadow-2);
}
.hero-figure-grid {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
}
.hero-figure-pane {
  padding: 20px;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.hero-figure-pane + .hero-figure-pane { border-left: 1px dashed var(--border); }
.hero-figure-label {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.22em;
  color: var(--text-soft);
  margin-bottom: 6px;
}
.hero-figure-bar {
  height: 14px;
  width: var(--w);
  background: var(--ink);
  position: relative;
}
.hero-figure-after .hero-figure-bar { background: var(--ink-2); }
.hero-figure-after .hero-figure-bar.diff::after {
  content: "";
  position: absolute;
  inset: -4px -2px;
  outline: 2px solid var(--accent);
  outline-offset: 0;
  pointer-events: none;
  animation: pulse 2.4s ease-in-out infinite;
}
.hero-figure-cross {
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--accent);
  transform: translateX(-0.5px);
}
.hero-figure-caption {
  margin: 14px 0 0;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-soft);
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

/* === Tool === */
.tool-section {
  padding-block: clamp(48px, 7vw, 80px);
  border-bottom: 1px solid var(--border);
}

.editor-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 14px;
}
@media (max-width: 720px) {
  .editor-grid { grid-template-columns: 1fr; }
}

.editor-panel {
  display: grid;
  gap: 8px;
  min-width: 0;
}

.editor-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.editor-title {
  color: var(--text-soft);
  font-size: 0.84rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.editor-tag {
  width: 24px;
  height: 24px;
  display: inline-grid;
  place-items: center;
  border: 1px solid var(--border);
  background: var(--surface);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
}
.editor-tag.accent {
  border-color: var(--accent);
  color: var(--accent);
}

.file-drop {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  min-height: 42px;
  border: 1px dashed var(--border);
  background: var(--surface);
  color: var(--text-soft);
  font-size: 0.86rem;
  padding: 6px 6px 6px 14px;
  cursor: pointer;
  position: relative;
  transition: background 140ms ease, border-color 140ms ease, color 140ms ease;
}
.drop-zone.drag-over .file-drop {
  background: color-mix(in srgb, var(--accent) 8%, var(--surface));
  border-color: var(--accent);
  color: var(--accent);
}
.file-button {
  display: inline-grid;
  place-items: center;
  min-height: 30px;
  background: var(--ink);
  color: var(--paper);
  padding: 0 14px;
  font-size: 0.82rem;
  letter-spacing: 0.06em;
}
.file-drop input {
  position: absolute;
  inline-size: 1px;
  block-size: 1px;
  opacity: 0;
  pointer-events: none;
}

textarea {
  min-height: 220px;
  resize: vertical;
  width: 100%;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.84rem;
  line-height: 1.55;
  padding: 14px;
  tab-size: 2;
  border-radius: 2px;
  box-shadow: var(--shadow-1);
}
textarea:focus,
input:focus-visible,
button:focus-visible,
.file-drop:focus-within {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.viewer-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 12px;
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: var(--shadow-1);
}
.toolbar-group {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.segmented {
  display: inline-grid;
  grid-template-columns: repeat(5, 1fr);
  border: 1px solid var(--border);
  overflow: hidden;
}
.segmented button {
  border: 0;
  border-radius: 0;
  min-width: 60px;
  background: var(--surface);
  color: var(--text);
  padding: 8px 10px;
  font-size: 0.84rem;
  letter-spacing: 0.04em;
}
.segmented button + button { border-left: 1px solid var(--border); }
.segmented button:hover { background: var(--surface-2); }
.segmented button.active {
  background: var(--ink);
  color: var(--paper);
}

.range-control,
.toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text-soft);
  font-size: 0.84rem;
}
.range-control input {
  accent-color: var(--accent);
  width: clamp(120px, 22vw, 220px);
}
.toggle input {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
}

.btn-sm {
  padding: 7px 14px;
  border: 1px solid var(--border);
  background: var(--surface);
  font-size: 0.84rem;
  border-radius: 2px;
  letter-spacing: 0.02em;
}
.btn-sm:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.btn-sm.primary {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}
.btn-sm.primary:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.status-row {
  min-height: 36px;
  display: flex;
  align-items: center;
  color: var(--text-soft);
  font-size: 0.86rem;
  margin-block: 14px;
  padding-inline: 4px;
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}
.status-row.warn { color: var(--accent); }

/* Viewer */
.viewer {
  position: relative;
  min-height: 620px;
  --after-sidebar-width: 240px;
  border: 1px solid var(--border);
  background:
    linear-gradient(45deg, var(--surface-2) 25%, transparent 25%),
    linear-gradient(-45deg, var(--surface-2) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, var(--surface-2) 75%),
    linear-gradient(-45deg, transparent 75%, var(--surface-2) 75%);
  background-color: var(--surface);
  background-position: 0 0, 0 10px, 10px -10px, -10px 0;
  background-size: 20px 20px;
  overflow: hidden;
  box-shadow: var(--shadow-1);
}

.pane {
  position: relative;
  min-width: 0;
  background: var(--surface);
  display: flex;
  flex-direction: column;
}
.pane > iframe {
  flex: 1;
  min-height: 0;
}
.pane-label {
  position: absolute;
  left: 10px;
  top: 10px;
  z-index: 2;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  padding: 5px 10px;
}
.pane-label.accent { background: var(--accent); }

iframe {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
  background: #fff;
}

.mode-side {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.mode-side .pane { display: block; }
.mode-side .pane + .pane { border-left: 1px solid var(--border); }

.diff-stack,
.wipe-stack,
.heatmap-stack,
.code-diff-stack {
  display: none;
}
.mode-diff,
.mode-wipe,
.mode-heatmap,
.mode-code { display: block; }
.mode-diff .pane,
.mode-wipe .pane,
.mode-heatmap .pane,
.mode-code .pane { display: none; }

.mode-diff .diff-stack,
.mode-wipe .wipe-stack,
.mode-heatmap .heatmap-stack,
.mode-code .code-diff-stack {
  display: block;
  position: absolute;
  inset: 0;
}

.diff-stack iframe,
.wipe-stack > iframe,
.heatmap-stack > iframe,
.heatmap-stack > canvas {
  position: absolute;
  inset: 0;
}

.diff-stack iframe:first-child {
  opacity: 0.96;
}
.diff-stack iframe:last-child {
  mix-blend-mode: difference;
  opacity: 0.86;
  filter: saturate(2.4) contrast(1.25);
}

#wipeAfterFrame {
  clip-path: inset(0 0 0 var(--wipe-left, 50%));
  z-index: 1;
}
#wipeAfterSidebarFrame {
  display: none;
  left: var(--wipe-left-px, 0px);
  right: auto;
  width: var(--viewer-width, 100%);
  clip-path: inset(0 calc(100% - var(--after-sidebar-width, 240px)) 0 0);
  z-index: 2;
  pointer-events: none;
}
.mode-wipe.wipe-sidebar-proxy-active #wipeAfterSidebarFrame {
  display: block;
}
.wipe-line {
  position: absolute;
  inset-block: 0;
  left: var(--wipe-left, 50%);
  width: 2px;
  transform: translateX(-1px);
  background: var(--accent);
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.86);
  z-index: 3;
}

#heatmapCanvas {
  width: 100%;
  height: 100%;
  pointer-events: none;
  mix-blend-mode: normal;
  z-index: 2;
}
.heatmap-legend {
  position: absolute;
  left: 14px;
  bottom: 14px;
  z-index: 3;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: color-mix(in srgb, var(--ink) 88%, transparent);
  color: var(--paper);
  padding: 6px 10px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
}
.heatmap-legend-bar {
  width: 100px;
  height: 8px;
  background: linear-gradient(90deg, #2a9df4 0%, #f7d51d 50%, #e63946 100%);
}
.heatmap-stat {
  border-left: 1px solid rgba(255,255,255,0.3);
  padding-left: 10px;
  margin-left: 4px;
}

.code-diff-stack {
  background: var(--surface);
  color: var(--text);
  overflow: hidden;
}
.code-diff-header {
  position: absolute;
  inset: 0 0 auto 0;
  min-height: 42px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  z-index: 2;
}
.code-diff-body {
  position: absolute;
  inset: 42px 0 0 0;
  overflow: auto;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.5;
  background: var(--surface);
}
.code-diff-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  min-width: 900px;
  border-bottom: 1px solid var(--border-soft);
}
.code-diff-cell {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  min-width: 0;
}
.code-diff-cell + .code-diff-cell {
  border-left: 1px solid var(--border);
}
.code-diff-line {
  display: inline-grid;
  place-items: start end;
  padding: 3px 10px;
  color: var(--text-soft);
  user-select: none;
  border-right: 1px solid var(--border-soft);
}
.code-diff-code {
  margin: 0;
  padding: 3px 12px;
  min-height: 1.5em;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.code-diff-row.add .code-diff-cell.after {
  background: color-mix(in srgb, var(--good) 18%, var(--surface));
}
.code-diff-row.delete .code-diff-cell.before {
  background: color-mix(in srgb, var(--accent) 16%, var(--surface));
}
.code-diff-row.change .code-diff-cell {
  background: color-mix(in srgb, #f7d51d 18%, var(--surface));
}
.code-diff-empty {
  display: grid;
  place-items: center;
  min-height: 100%;
  color: var(--text-soft);
  font-family: var(--font-mono);
  font-size: 0.86rem;
  padding: 24px;
  text-align: center;
}

/* オフスクリーンレンダリング用ステージ（ヒートマップ計算で使用） */
.offscreen-stage {
  position: fixed;
  left: -10000px;
  top: 0;
  width: 1280px;
  height: 800px;
  pointer-events: none;
  z-index: -1;
}
.offscreen-stage iframe {
  width: 1280px;
  height: 800px;
  border: 0;
}

/* Ad slot */
.ad-slot {
  padding-block: 24px;
}
.ad-placeholder {
  border: 1px dashed var(--border);
  min-height: 100px;
  display: grid;
  place-items: center;
  color: var(--text-soft);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
}
.ad-placeholder-label { text-transform: uppercase; }

/* === Features === */
.features {
  padding-block: clamp(48px, 7vw, 80px);
  border-bottom: 1px solid var(--border);
}
.feature-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--border);
  border-left: 1px solid var(--border);
}
@media (max-width: 1100px) { .feature-grid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 880px) { .feature-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 540px) { .feature-grid { grid-template-columns: 1fr; } }
.feature {
  padding: 28px;
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  position: relative;
  transition: background 200ms ease;
}
.feature:hover { background: var(--surface-2); }
.feature-num {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  color: var(--text-soft);
  margin-bottom: 14px;
}
.feature-num.accent { color: var(--accent); }
.feature h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.32rem;
  margin: 0 0 10px;
  letter-spacing: -0.005em;
}
.feature p {
  margin: 0;
  color: var(--text-soft);
  font-size: 0.94rem;
}

/* === How to === */
.how-to {
  padding-block: clamp(48px, 7vw, 80px);
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}
.steps {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  counter-reset: step;
}
@media (max-width: 880px) { .steps { grid-template-columns: 1fr; } }
.steps li {
  border-top: 2px solid var(--ink);
  padding-top: 18px;
}
.step-num {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  color: var(--accent);
}
.steps h3 {
  font-family: var(--font-display);
  font-weight: 600;
  margin: 8px 0 8px;
  font-size: 1.32rem;
}
.steps p {
  color: var(--text-soft);
  font-size: 0.94rem;
  margin: 0;
}

/* === Use cases === */
.use-cases {
  padding-block: clamp(48px, 7vw, 80px);
  border-bottom: 1px solid var(--border);
}
.case-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}
@media (max-width: 720px) { .case-grid { grid-template-columns: 1fr; } }
.case {
  background: var(--surface);
  padding: 28px;
}
.case h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.18rem;
  margin: 0 0 6px;
}
.case p {
  margin: 0;
  color: var(--text-soft);
  font-size: 0.94rem;
}

/* === FAQ === */
.faq {
  padding-block: clamp(48px, 7vw, 80px);
  border-bottom: 1px solid var(--border);
}
.faq-list { display: grid; gap: 0; border-top: 1px solid var(--border); }
.faq-list details {
  border-bottom: 1px solid var(--border);
  padding: 18px 4px;
}
.faq-list summary {
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.1rem;
  list-style: none;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-weight: 400;
  color: var(--accent);
  transition: transform 200ms ease;
}
.faq-list details[open] summary::after { content: "−"; }
.faq-list p {
  margin: 12px 0 0;
  color: var(--text-soft);
  font-size: 0.94rem;
  max-width: 70ch;
}

/* === Footer === */
.site-footer {
  padding-block: 36px;
  background: var(--ink);
  color: var(--paper);
}
[data-theme="dark"] .site-footer { background: #050810; }

.footer-inner {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 24px;
  align-items: center;
}
@media (max-width: 720px) {
  .footer-inner { grid-template-columns: 1fr; }
}
.site-footer .brand-display { color: var(--paper); }
.footer-tagline {
  margin: 4px 0 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: rgba(244, 241, 236, 0.55);
  text-transform: uppercase;
}
.footer-nav {
  display: flex;
  gap: 22px;
  flex-wrap: wrap;
}
.footer-nav a {
  color: rgba(244, 241, 236, 0.7);
  font-size: 0.9rem;
}
.footer-nav a:hover { color: var(--accent); }
.footer-meta {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: rgba(244, 241, 236, 0.5);
  margin: 0;
  letter-spacing: 0.08em;
}

/* === Cookie banner === */
.cookie-banner {
  position: fixed;
  bottom: 16px;
  left: 16px;
  right: 16px;
  max-width: 640px;
  margin-inline: auto;
  background: var(--ink);
  color: var(--paper);
  padding: 16px 18px;
  border-radius: 4px;
  box-shadow: 0 16px 48px rgba(0,0,0,0.35);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
  z-index: 80;
}
.cookie-banner[hidden] {
  display: none;
}
.cookie-banner p {
  margin: 0;
  flex: 1;
  font-size: 0.86rem;
  line-height: 1.55;
}
.cookie-banner a { color: var(--accent); text-decoration: underline; }
.cookie-banner .btn-sm {
  background: transparent;
  color: var(--paper);
  border-color: rgba(244,241,236,0.3);
}
.cookie-banner .btn-sm:hover {
  background: var(--paper);
  color: var(--ink);
  border-color: var(--paper);
}
.cookie-banner .btn-sm.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.cookie-banner .btn-sm.primary:hover {
  background: var(--accent-warm);
  border-color: var(--accent-warm);
}

/* === Static pages (about/privacy/terms/contact) === */
.doc-page {
  padding-block: clamp(48px, 7vw, 80px);
}
.doc-page article {
  max-width: 70ch;
  margin: 0 auto;
}
.doc-page h1 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  margin: 0 0 28px;
}
.doc-page h2 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.36rem;
  margin: 32px 0 12px;
}
.doc-page p,
.doc-page li {
  font-size: 0.98rem;
  line-height: 1.7;
}
.doc-page ul {
  padding-left: 1.4em;
}
.doc-page address {
  font-style: normal;
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 14px 16px;
  border-radius: 2px;
}

/* === Reduced motion === */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}