/* agentchute.dev — hand-crafted styles, no build chain. */

:root {
  --bg: #fbfaf7;
  --bg-alt: #f3f0e8;
  --fg: #1c1b18;
  --fg-dim: #545048;
  --accent: #b94a26;
  --accent-fg: #ffffff;
  --rule: #d8d2c4;
  --code-bg: #1c1b18;
  --code-fg: #f3f0e8;
  --link: #2a4a8a;
  --link-hover: #b94a26;
  --width: 720px;
  --mono: "JetBrains Mono", "SF Mono", "Menlo", "Consolas", monospace;
  --serif: "Charter", "Iowan Old Style", "Palatino", "Georgia", serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
}

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

html {
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  color: var(--fg);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body {
  margin: 0;
}

.wrap {
  max-width: var(--width);
  margin: 0 auto;
  padding: 0 24px;
}

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

header.site {
  border-bottom: 1px solid var(--rule);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  background: rgba(251, 250, 247, 0.92);
}

header.site .wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 16px;
  padding-bottom: 16px;
}

.logo {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 18px;
  color: var(--fg);
  letter-spacing: -0.01em;
}

header.site nav {
  display: flex;
  gap: 20px;
}

header.site nav a {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--fg-dim);
  text-decoration: none;
  transition: color 120ms ease;
}

header.site nav a:hover {
  color: var(--accent);
}

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

main {
  padding: 0;
}

section {
  padding: 56px 0;
  border-bottom: 1px solid var(--rule);
}

section:last-of-type {
  border-bottom: none;
}

section.hero {
  padding-top: 80px;
  padding-bottom: 64px;
}

h1 {
  font-family: var(--serif);
  font-size: clamp(28px, 4.2vw, 40px);
  line-height: 1.18;
  letter-spacing: -0.015em;
  margin: 0 0 24px 0;
  font-weight: 600;
}

h1 .dim {
  color: var(--fg-dim);
  font-weight: 400;
  font-style: italic;
}

h2 {
  font-family: var(--serif);
  font-size: clamp(22px, 2.4vw, 26px);
  line-height: 1.25;
  margin: 0 0 16px 0;
  font-weight: 600;
}

h3 {
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.3;
  margin: 24px 0 8px 0;
  font-weight: 600;
}

p {
  margin: 0 0 16px 0;
}

p.lede {
  font-size: 18px;
  line-height: 1.55;
  color: var(--fg);
  margin-bottom: 24px;
}

p.lede-foot {
  font-size: 14px;
  color: var(--fg-dim);
  margin-top: 12px;
}

.tiny {
  font-size: 12px;
  color: var(--fg-dim);
  line-height: 1.5;
}

/* ---------- code / pre ---------- */

code {
  font-family: var(--mono);
  font-size: 0.88em;
}

p code,
li code {
  background: var(--bg-alt);
  border: 1px solid var(--rule);
  border-radius: 3px;
  padding: 1px 5px;
  font-size: 0.86em;
}

pre {
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.55;
  background: var(--code-bg);
  color: var(--code-fg);
  padding: 18px 20px;
  border-radius: 6px;
  overflow-x: auto;
  margin: 16px 0 24px 0;
}

pre code {
  background: transparent;
  border: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
}

pre.install {
  background: var(--fg);
  color: var(--bg);
  font-size: 14px;
  white-space: pre-wrap;
  word-break: break-all;
}

/* ---------- hero video (clickable thumbnail → YouTube) ---------- */

figure.video {
  margin: 32px 0 0 0;
}

a.video-thumb {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: var(--code-bg);
  border-radius: 6px;
  overflow: hidden;
  border: 1px solid var(--rule);
  text-decoration: none;
  transition: border-color 160ms ease, transform 160ms ease;
}

a.video-thumb:hover {
  border-color: var(--accent);
}

a.video-thumb img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 220ms ease, filter 220ms ease;
}

a.video-thumb:hover img {
  transform: scale(1.015);
  filter: brightness(0.92);
}

a.video-thumb .video-play {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.72);
  color: #fff;
  font-size: 28px;
  line-height: 72px;
  text-align: center;
  padding-left: 6px; /* optical centering for the ▶ glyph */
  box-sizing: border-box;
  transition: background 160ms ease, transform 160ms ease;
  pointer-events: none;
}

a.video-thumb:hover .video-play {
  background: var(--accent);
  transform: translate(-50%, -50%) scale(1.05);
}

figure.video figcaption {
  margin-top: 10px;
  font-size: 13px;
  color: var(--fg-dim);
  line-height: 1.5;
  text-align: center;
}

figure.video figcaption a {
  color: var(--fg-dim);
  text-decoration: underline;
}

figure.video figcaption a:hover {
  color: var(--accent);
}

pre.ascii {
  background: var(--bg-alt);
  color: var(--fg);
  font-size: 12px;
  line-height: 1.35;
  border: 1px solid var(--rule);
}

pre.ascii code {
  font-family: var(--mono);
  white-space: pre;
}

/* ---------- animations ---------- */

.anim {
  margin: 16px 0 24px 0;
}

.anim pre.ascii-anim {
  margin-bottom: 0;
  border-radius: 6px 6px 0 0;
  transition: opacity 200ms ease;
}

/* Per-animation min-heights match the padded line count of each sequence
 * (handoff = ~15 padded lines, review = ~20). Prevents a layout flash on
 * the initial render before anim.js sets the first frame, and matches the
 * steady-state height once padFrames() has equalized every frame. */
.anim[data-anim="handoff"] pre.ascii-anim {
  min-height: 280px;
}

.anim[data-anim="review"] pre.ascii-anim {
  min-height: 380px;
}

.anim pre.ascii-anim > code {
  display: block;
  animation: ascii-fade 380ms ease;
}

@keyframes ascii-fade {
  from {
    opacity: 0.5;
    transform: translateY(-1px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.anim-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: var(--fg);
  color: var(--code-fg);
  border-radius: 0 0 6px 6px;
  font-family: var(--mono);
  font-size: 12px;
  border: 1px solid var(--rule);
  border-top: none;
}

.anim-controls button {
  background: transparent;
  border: 1px solid rgba(243, 240, 232, 0.25);
  color: var(--code-fg);
  font-family: var(--mono);
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 3px;
  cursor: pointer;
  transition: background 120ms ease, border-color 120ms ease;
}

.anim-controls button:hover {
  background: rgba(243, 240, 232, 0.08);
  border-color: rgba(243, 240, 232, 0.55);
}

.anim-controls button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.anim-controls .anim-play {
  min-width: 84px;
}

.anim-step-label {
  margin-left: auto;
  color: rgba(243, 240, 232, 0.75);
  font-variant-numeric: tabular-nums;
}

@media (prefers-reduced-motion: reduce) {
  .anim pre.ascii-anim > code {
    animation: none;
  }
}

/* ---------- lists ---------- */

ul {
  margin: 0 0 16px 0;
  padding-left: 22px;
}

ul li {
  margin-bottom: 8px;
}

ul.grid {
  list-style: none;
  padding-left: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 24px;
}

@media (min-width: 640px) {
  ul.grid {
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }
}

ul.grid li {
  background: var(--bg-alt);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 14px 16px;
  margin-bottom: 0;
  font-size: 14px;
  line-height: 1.5;
}

ul.commands {
  list-style: none;
  padding-left: 0;
}

ul.commands li {
  padding: 10px 0;
  border-bottom: 1px solid var(--rule);
  font-size: 14px;
}

ul.commands li:last-child {
  border-bottom: none;
}

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

section.primitives,
section.notwhat,
section.cli,
section.why {
  background: var(--bg);
}

section.flow,
section.quickstart {
  background: var(--bg-alt);
}

section.flow pre.ascii {
  background: var(--bg);
}

/* ---------- links ---------- */

a {
  color: var(--link);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-thickness: 1px;
  transition: color 120ms ease;
}

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

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

footer {
  padding: 40px 0;
  background: var(--fg);
  color: var(--code-fg);
}

footer .wrap {
  text-align: center;
}

footer p {
  margin-bottom: 12px;
  font-size: 14px;
}

footer a {
  color: var(--code-fg);
  text-decoration: underline;
  text-decoration-color: var(--fg-dim);
}

footer a:hover {
  color: var(--bg);
  text-decoration-color: var(--bg);
}

footer .tiny {
  color: rgba(243, 240, 232, 0.65);
  max-width: 480px;
  margin: 0 auto;
}

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

@media (max-width: 520px) {
  header.site .wrap {
    flex-direction: column;
    gap: 12px;
    align-items: flex-start;
  }
  section {
    padding: 40px 0;
  }
  section.hero {
    padding-top: 48px;
    padding-bottom: 40px;
  }
}