/* ACS landing — design tokens + base */
:root {
  --accent-h: 165;
  --accent-c: 0.18;
  --accent-l: 0.72;
  --accent: oklch(var(--accent-l) var(--accent-c) var(--accent-h));
  --accent-soft: oklch(var(--accent-l) var(--accent-c) var(--accent-h) / 0.12);
  --accent-line: oklch(var(--accent-l) var(--accent-c) var(--accent-h) / 0.35);
  --accent-ink: oklch(0.18 0.04 var(--accent-h));

  --density: 1;
  --font-sans: "Geist", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --font-display: var(--font-sans);

  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 16px;

  --tx-1: 11px;
  --tx-2: 13px;
  --tx-3: 15px;
  --tx-4: 18px;
  --tx-5: 22px;
  --tx-6: 28px;
  --tx-7: 40px;
  --tx-8: 56px;
  --tx-9: 80px;

  color-scheme: light dark;
}

/* Light theme */
:root[data-theme="light"] {
  --bg: oklch(0.985 0.003 220);
  --bg-elev: oklch(1 0 0);
  --bg-sunk: oklch(0.965 0.004 220);
  --ink: oklch(0.18 0.01 240);
  --ink-2: oklch(0.38 0.01 240);
  --ink-3: oklch(0.55 0.01 240);
  --line: oklch(0.9 0.005 240);
  --line-2: oklch(0.94 0.004 240);
  --code-bg: oklch(0.97 0.005 240);
  --code-ink: oklch(0.22 0.01 240);
  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.04);
  --shadow: 0 1px 2px oklch(0 0 0 / 0.04), 0 8px 24px oklch(0 0 0 / 0.06);
  --grid-line: oklch(0 0 0 / 0.04);
}

/* Dark theme */
:root[data-theme="dark"] {
  --bg: oklch(0.16 0.01 240);
  --bg-elev: oklch(0.2 0.012 240);
  --bg-sunk: oklch(0.13 0.01 240);
  --ink: oklch(0.96 0.005 240);
  --ink-2: oklch(0.74 0.008 240);
  --ink-3: oklch(0.55 0.01 240);
  --line: oklch(0.27 0.012 240);
  --line-2: oklch(0.23 0.012 240);
  --code-bg: oklch(0.18 0.012 240);
  --code-ink: oklch(0.92 0.005 240);
  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.4);
  --shadow: 0 1px 2px oklch(0 0 0 / 0.4), 0 12px 32px oklch(0 0 0 / 0.35);
  --grid-line: oklch(1 0 0 / 0.05);
  --accent-ink: oklch(0.16 0.04 var(--accent-h));
}

* { box-sizing: border-box; }
html, body {
  margin: 0;
  padding: 0;
  /* Hard clamp on horizontal scroll. Any rogue overflowing element
   * (canvas wider than viewport, code window, fixed tweaks panel,
   * etc.) was making the whole page horizontally scrollable on mobile.
   * `overflow-x: clip` is the modern equivalent of `hidden` that
   * doesn't establish a new containing block — fewer side effects. */
  overflow-x: clip;
  /* Fallback for engines that don't support `clip` yet. */
  overflow-x: hidden;
}
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--ink);
  font-size: var(--tx-3);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: "ss01", "cv11";
  /* Smooth horizontal scrolling for touch where tables / code blocks
   * still need to scroll INSIDE their container. */
  -webkit-text-size-adjust: 100%;
}

::selection { background: var(--accent); color: var(--accent-ink); }

a { color: inherit; text-decoration: none; }
button { font-family: inherit; font-size: inherit; cursor: pointer; }
code, pre, .mono { font-family: var(--font-mono); font-feature-settings: "calt" 0; }

/* Layout */
.wrap {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
}
@media (max-width: 720px) {
  .wrap { padding: 0 20px; }
}

/* ---------- Nav ---------- *
 * Sticky + backdrop-filter is a known scroll-FPS killer because the
 * filter re-rasterizes against the page beneath every scroll frame.
 * Tuned to keep the glass feel but cut GPU cost: bg alpha bumped to
 * 92% (less work for blur to do), blur radius dropped 14px → 8px,
 * saturate removed (it's a second filter pass for almost no visual
 * gain). transform: translateZ(0) keeps the nav on its own compositor
 * layer so scroll only repaints below — not the nav itself. */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in oklch, var(--bg) 92%, transparent);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
  transform: translateZ(0);
  will-change: backdrop-filter;
}
.nav-inner {
  display: flex;
  align-items: center;
  gap: 28px;
  height: 56px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: var(--tx-3);
  letter-spacing: -0.01em;
}
/* Nav shield: drop the heavy hover transform/shadow it inherits from
 * the hero version — at 28px those animations feel jittery. */
.brand .acs-shield {
  filter: none;
  transition: opacity 150ms;
}
.brand:hover .acs-shield { opacity: 0.85; }
.brand:hover .acs-shield { transform: none; }
.nav-links {
  display: flex;
  gap: 22px;
  margin-left: 8px;
  font-size: var(--tx-2);
  color: var(--ink-2);
  /* On mobile we let the nav scroll horizontally inside its own track
   * rather than pushing the whole page wide. Hide the scrollbar
   * cosmetic-wise; arrow keys / swipe still work. */
  overflow-x: auto;
  scrollbar-width: none;
}
.nav-links::-webkit-scrollbar { display: none; }
.nav-links a { white-space: nowrap; }
.nav-links a:hover { color: var(--ink); }
@media (max-width: 720px) {
  .nav-links { gap: 16px; font-size: var(--tx-1); margin-left: 0; }
  /* Hide the GitHub icon button on small screens — nav already crowded. */
  .nav-actions .icon-btn[title="GitHub"] { display: none; }
}
.nav-spacer { flex: 1; }
.nav-actions { display: flex; align-items: center; gap: 8px; }

.icon-btn {
  width: 32px; height: 32px;
  display: grid; place-items: center;
  border: 1px solid var(--line);
  background: var(--bg-elev);
  border-radius: 8px;
  color: var(--ink-2);
  transition: color 120ms, background 120ms, border-color 120ms;
}
.icon-btn:hover { color: var(--ink); border-color: var(--ink-3); }
.icon-btn svg { width: 14px; height: 14px; }

.sound-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0 10px 0 8px;
  height: 32px;
  border: 1px solid var(--line);
  background: var(--bg-elev);
  border-radius: 8px;
  color: var(--ink-2);
  font-size: var(--tx-2);
  font-family: var(--font-mono);
  white-space: nowrap;
  transition: all 120ms;
}
.sound-toggle:hover { color: var(--ink); border-color: var(--ink-3); }
.sound-toggle.on {
  color: var(--accent-ink);
  background: var(--accent);
  border-color: var(--accent);
}
.sound-toggle .dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--ink-3);
}
.sound-toggle.on .dot {
  background: var(--accent-ink);
  animation: pulse 1.6s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.7); }
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0 14px;
  height: 36px;
  border-radius: 8px;
  font-size: var(--tx-2);
  font-weight: 500;
  border: 1px solid transparent;
  transition: all 120ms;
  white-space: nowrap;
}
.btn-primary {
  background: var(--ink);
  color: var(--bg);
  border-color: var(--ink);
}
.btn-primary:hover { background: var(--ink-2); border-color: var(--ink-2); }
.btn-ghost {
  background: transparent;
  color: var(--ink-2);
  border-color: var(--line);
}
.btn-ghost:hover { color: var(--ink); border-color: var(--ink-3); background: var(--bg-elev); }
.btn-accent {
  background: var(--accent);
  color: var(--accent-ink);
  border-color: var(--accent);
  font-weight: 600;
}
.btn-accent:hover { filter: brightness(1.05); }
.btn svg { width: 13px; height: 13px; }

/* ---------- Section helpers ---------- */
.section {
  padding: calc(96px * var(--density)) 0;
  border-top: 1px solid var(--line);
}
.section-tight { padding: calc(64px * var(--density)) 0; }
@media (max-width: 720px) {
  .section { padding: calc(56px * var(--density)) 0; }
  .section-tight { padding: calc(40px * var(--density)) 0; }
}
.section-head {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 48px;
  max-width: 720px;
}
.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--tx-1);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
}
.eyebrow::before {
  content: "";
  width: 18px;
  height: 1px;
  background: currentColor;
}
.section-title {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.05;
  margin: 0;
  text-wrap: balance;
}
.section-sub {
  font-size: var(--tx-4);
  color: var(--ink-2);
  margin: 0;
  text-wrap: pretty;
  max-width: 600px;
}

/* ---------- Code ---------- */
.code {
  font-family: var(--font-mono);
  font-size: var(--tx-2);
  line-height: 1.6;
  background: var(--code-bg);
  color: var(--code-ink);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
  overflow: auto;
  white-space: pre;
  tab-size: 2;
}
.code .tok-sel { color: var(--accent); }
.code .tok-prop { color: oklch(0.55 0.13 280); }
:root[data-theme="dark"] .code .tok-prop { color: oklch(0.78 0.14 280); }
.code .tok-val { color: oklch(0.45 0.16 30); }
:root[data-theme="dark"] .code .tok-val { color: oklch(0.78 0.13 50); }
.code .tok-str { color: oklch(0.5 0.13 150); }
:root[data-theme="dark"] .code .tok-str { color: oklch(0.78 0.13 150); }
.code .tok-com { color: var(--ink-3); font-style: italic; }
.code .tok-at { color: oklch(0.55 0.18 320); font-weight: 500; }
:root[data-theme="dark"] .code .tok-at { color: oklch(0.78 0.16 320); }
.code .tok-num { color: oklch(0.55 0.16 230); }
:root[data-theme="dark"] .code .tok-num { color: oklch(0.78 0.13 230); }
.code .tok-punct { color: var(--ink-3); }

.kbd {
  font-family: var(--font-mono);
  font-size: var(--tx-1);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--line);
  background: var(--bg-elev);
  color: var(--ink-2);
}

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--line);
  padding: 48px 0 32px;
  color: var(--ink-3);
  font-size: var(--tx-2);
}
.footer-cols {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 48px;
}
.footer h4 {
  font-size: var(--tx-2);
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 16px;
  letter-spacing: 0.01em;
}
.footer ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.footer a:hover { color: var(--ink); }
.footer-bottom {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: var(--tx-1);
}
@media (max-width: 720px) {
  .footer-cols { grid-template-columns: 1fr 1fr; gap: 32px; }
}

/* ---------- Misc atoms ---------- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 26px;
  padding: 0 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--bg-elev);
  color: var(--ink-2);
  font-family: var(--font-mono);
  font-size: var(--tx-1);
  white-space: nowrap;
}
.chip-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

.divider {
  height: 1px;
  background: var(--line);
  margin: 24px 0;
}

/* ============================================================
 * Mobile overflow guards
 * ============================================================
 * Apply broadly so every grid track and inline-code paragraph
 * actually fits the viewport. Three patterns:
 *
 *   1. Grid items default to `min-width: auto` (intrinsic content);
 *      a long inline-code chip pushes the cell wider than its track.
 *      `min-width: 0` on common grid children fixes this.
 *
 *   2. Inline `<code>` chips with padding/border are treated as
 *      unbreakable tokens by some engines. `overflow-wrap: anywhere`
 *      on text containers allows breaks inside.
 *
 *   3. Any rule in this file uses safe defaults; per-component
 *      overrides remain free to opt-out (`overflow-wrap: normal`).
 */
.install-wrap > *,
.compare-grid > *,
.rw-grid > *,
.theme-grid > *,
.feature-grid > *,
.cg-detail-body > *,
.cg-grid > *,
.section-head,
.compare,
.cg-card { min-width: 0; }


/* Text containers that often hold inline `<code>` chips. break-word
 * allows long unbreakable runs (URL, identifier) to break — unlike
 * `anywhere`, it ONLY kicks in as a last resort, so normal prose
 * still wraps at word boundaries. Switched from `anywhere` because
 * the more aggressive value was splitting `<code>` content mid-token
 * (e.g. `window.ACS.devtools.m` / `ount()`). */
.section-sub,
.install-checks li,
.feature-desc,
.cg-detail-sub,
.compare-sub,
.rw-stylesheet-note,
.theme-desc {
  overflow-wrap: break-word;
  word-break: normal;
}

/* Inline code chips stay atomic — `nowrap` keeps a chip on one line so
 * a method name like `window.ACS.devtools.mount()` reads cleanly; the
 * line break still happens at the space BEFORE or AFTER the chip
 * because the parent's `overflow-wrap: break-word` only targets
 * non-breakable runs at the last resort. If a chip is genuinely
 * wider than the viewport, the parent's `min-width: 0` and our
 * `overflow-x: clip` body rule keep the rest of the page from being
 * pushed sideways. */
.section-sub code,
.install-checks li code,
.feature-desc code,
.cg-detail-sub code,
.rw-stylesheet-note code,
.compare-sub code,
.theme-desc code {
  white-space: nowrap;
  overflow-wrap: normal;
  word-break: normal;
}

/* Section titles that wrap with `<br/>` — let them break gracefully */
.section-title { overflow-wrap: anywhere; word-break: break-word; }

@media (max-width: 720px) {
  /* Tighten grid gaps on phones */
  .install-wrap { gap: 24px; }
  .install-checks { margin-top: 20px; }
  .install-checks li { font-size: var(--tx-2); }
  .compare { padding: 16px; }
  .rw-app { padding: 16px; }
  /* Section eyebrows can wrap onto two lines if needed */
  .eyebrow { white-space: normal; }
}