/*
 * Teyru landing page. Two themes, three locales, no dependencies, system fonts only.
 *
 * Every colour pair used for text is listed with its measured WCAG contrast ratio in
 * README.md, so a change here can be re-checked against the same numbers.
 */

:root {
  color-scheme: light;

  --bg: #ffffff;
  --surface: #f7f9fc;
  --surface-2: #eef2f8;
  --fg: #14171c;
  --muted: #4c5563;
  --border: #dfe4ec;
  --rule: #edf0f5;

  --accent: #1050c8;
  --accent-fg: #ffffff;
  --accent-hover: #0d3f9e;

  --control-bg: #ffffff;
  --control-fg: #14171c;
  --control-border: #d3d9e2;

  --glow: rgba(16, 80, 200, 0.14);
  --grid: rgba(20, 23, 28, 0.06);
  --shadow: 0 1px 2px rgba(16, 20, 28, 0.05), 0 20px 44px -34px rgba(16, 20, 28, 0.4);

  --tok-keyword: #0b46b8;
  --tok-type: #8a4708;
  --tok-string: #126b3a;
  --tok-name: #14171c;
  --tok-punct: #5f6875;

  --wordmark-from: #14171c;
  --wordmark-to: #2b3345;

  --sans:
    system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", "Noto Sans TC",
    "Noto Sans SC", "Noto Sans CJK TC", "PingFang TC", "PingFang SC", "Microsoft JhengHei",
    "Microsoft YaHei", "Hiragino Sans", sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --gutter: clamp(1.25rem, 4vw, 3rem);
  --band: clamp(2.5rem, 7vh, 4.5rem);
}

:root[data-theme="dark"] {
  color-scheme: dark;

  --bg: #0b0d10;
  --surface: #10141a;
  --surface-2: #151a22;
  --fg: #f2f5f8;
  --muted: #9aa5b4;
  --border: #262d37;
  --rule: #171c23;

  --accent: #7aa7ff;
  --accent-fg: #0b0d10;
  --accent-hover: #9cbcff;

  --control-bg: #121720;
  --control-fg: #f2f5f8;
  --control-border: #2c333d;

  --glow: rgba(122, 167, 255, 0.13);
  --grid: rgba(242, 245, 248, 0.055);
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.5), 0 20px 44px -30px rgba(0, 0, 0, 0.9);

  --tok-keyword: #8fb2ff;
  --tok-type: #f0b37e;
  --tok-string: #86d9a2;
  --tok-name: #f2f5f8;
  --tok-punct: #97a2b2;

  --wordmark-from: #ffffff;
  --wordmark-to: #ccd7e6;
}

* {
  box-sizing: border-box;
}

html {
  height: 100%;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100%;
  display: flex;
  flex-direction: column;
  background-color: var(--bg);
  background-image:
    radial-gradient(64rem 34rem at 50% -14%, var(--glow), transparent 70%),
    linear-gradient(to right, var(--grid) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid) 1px, transparent 1px);
  background-size:
    100% 100%,
    4.5rem 4.5rem,
    4.5rem 4.5rem;
  background-repeat: no-repeat, repeat, repeat;
  color: var(--fg);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

:focus-visible {
  outline: 2px solid var(--fg);
  outline-offset: 3px;
  border-radius: 6px;
}

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

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

/* Controls ---------------------------------------------------------------- */

.topbar {
  display: flex;
  justify-content: flex-end;
  padding: var(--gutter) var(--gutter) 0;
}

.topbar,
.showcase,
.facts-band {
  width: min(72rem, 100% - 2 * var(--gutter));
  margin-inline: auto;
}

.controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.control {
  font: inherit;
  font-size: 0.875rem;
  color: var(--control-fg);
  background: var(--control-bg);
  border: 1px solid var(--control-border);
  border-radius: 999px;
  min-height: 2.5rem;
  padding: 0.4rem 0.9rem;
  transition:
    border-color 120ms ease,
    background-color 120ms ease;
}

.control:hover {
  border-color: var(--muted);
}

.icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  padding: 0;
  cursor: pointer;
}

.icon {
  width: 1.1rem;
  height: 1.1rem;
}

.icon-sun {
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
}

.icon-moon {
  fill: currentColor;
}

/* The button offers the theme it switches to. */
:root[data-theme="dark"] .icon-moon,
:root:not([data-theme="dark"]) .icon-sun {
  display: none;
}

/* Hero -------------------------------------------------------------------- */

.hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: clamp(1.1rem, 2.4vw, 1.9rem);
  min-height: clamp(30rem, 64vh, 46rem);
  padding: clamp(2.5rem, 9vh, 6rem) clamp(1.5rem, 5vw, 3rem) clamp(2rem, 6vh, 3.5rem);
  text-align: center;
}

.wordmark {
  margin: 0;
  font-size: clamp(3.75rem, 22vw, 16rem);
  font-weight: 800;
  line-height: 0.88;
  letter-spacing: -0.045em;
  text-wrap: balance;
}

@supports (background-clip: text) or (-webkit-background-clip: text) {
  .wordmark {
    background-image: linear-gradient(180deg, var(--wordmark-from), var(--wordmark-to));
    background-clip: text;
    -webkit-background-clip: text;
    color: transparent;
  }
}

.tagline {
  margin: 0;
  max-width: 32rem;
  color: var(--muted);
  font-size: clamp(1.0625rem, 1rem + 0.45vw, 1.3125rem);
  line-height: 1.55;
  text-wrap: balance;
}

.cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: clamp(0.25rem, 1.5vw, 0.9rem);
  padding: 0.8rem 1.6rem;
  border-radius: 999px;
  background: var(--accent);
  color: var(--accent-fg);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  box-shadow: var(--shadow);
  transition:
    background-color 120ms ease,
    transform 120ms ease;
}

.cta:hover {
  background: var(--accent-hover);
}

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

.cta-arrow {
  transition: transform 120ms ease;
}

.cta:hover .cta-arrow {
  transform: translateX(3px);
}

/* Showcase ---------------------------------------------------------------- */

.showcase {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: clamp(0.9rem, 2vw, 1.4rem);
  align-items: stretch;
}

@media (max-width: 56rem) {
  .showcase {
    grid-template-columns: minmax(0, 1fr);
  }
}

.card {
  display: flex;
  flex-direction: column;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.card-head {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 2.6rem;
  padding: 0.5rem 1rem;
  border-bottom: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--muted);
  font-size: 0.75rem;
  line-height: 1;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.card-title {
  margin: 0;
  font: inherit;
  letter-spacing: inherit;
}

.card-file {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0;
  text-transform: none;
}

.card-body {
  display: flex;
  flex-direction: column;
  justify-content: center;
  flex: 1;
  gap: 0.9rem;
  padding: 1.15rem 1rem;
}

.code {
  margin: 0;
  padding: 1.05rem clamp(0.85rem, 2vw, 1.15rem) 1.2rem;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: clamp(0.6875rem, 0.66rem + 0.4vw, 0.875rem);
  line-height: 1.7;
  tab-size: 2;
}

.tok-k {
  color: var(--tok-keyword);
}

.tok-t {
  color: var(--tok-type);
}

.tok-s {
  color: var(--tok-string);
}

.tok-f {
  color: var(--tok-name);
}

.tok-p {
  color: var(--tok-punct);
}

.command {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.7rem 0.7rem 0.7rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  font-family: var(--mono);
  font-size: 0.8125rem;
  line-height: 1.5;
}

.prompt {
  color: var(--tok-punct);
  user-select: none;
}

.command code {
  flex: 1;
  min-width: 0;
  overflow-wrap: anywhere;
}

.copy {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: none;
  width: 2rem;
  height: 2rem;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--muted);
  cursor: pointer;
  transition:
    color 120ms ease,
    border-color 120ms ease,
    background-color 120ms ease;
}

.copy:hover {
  color: var(--fg);
  border-color: var(--muted);
}

.copy-icon {
  width: 1rem;
  height: 1rem;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.copy-icon-check {
  display: none;
  stroke-width: 2;
}

.copy.is-copied {
  color: var(--accent);
  border-color: var(--accent);
}

.copy.is-copied .copy-icon-copy {
  display: none;
}

.copy.is-copied .copy-icon-check {
  display: block;
}

.note {
  margin: 0;
  color: var(--muted);
  font-size: 0.875rem;
}

/* Facts ------------------------------------------------------------------- */

.facts-band {
  margin-top: var(--band);
  padding-top: clamp(1.5rem, 4vh, 2.5rem);
  border-top: 1px solid var(--rule);
}

.band-title {
  margin: 0 0 clamp(1rem, 2.5vh, 1.6rem);
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.facts {
  margin: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.1rem, 3vw, 1.9rem) clamp(1.5rem, 3vw, 2.5rem);
}

@media (min-width: 40rem) and (max-width: 62rem) {
  .facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 62rem) {
  .facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.fact {
  border-top: 1px solid var(--rule);
  padding-top: 0.9rem;
}

.fact dt {
  font-size: 0.9375rem;
  font-weight: 650;
}

.fact dd {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.9375rem;
  line-height: 1.55;
}

/* Footer ------------------------------------------------------------------ */

.footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  margin-top: var(--band);
  padding: 1.35rem var(--gutter) 2rem;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 0.875rem;
}

.footer-links {
  display: flex;
  gap: 1.25rem;
}

.footer a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition:
    color 120ms ease,
    border-color 120ms ease;
}

.footer a:hover {
  color: var(--fg);
  border-bottom-color: var(--border);
}

.install {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.75rem;
  margin: 0;
}

.install code {
  font-family: var(--mono);
  font-size: 0.8125rem;
  color: var(--fg);
  background: var(--rule);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.2rem 0.5rem;
  overflow-wrap: anywhere;
}

/* Motion ------------------------------------------------------------------ */

@media (prefers-reduced-motion: no-preference) {
  .hero > * {
    animation: rise 420ms ease-out both;
  }

  .hero > :nth-child(2) {
    animation-delay: 60ms;
  }

  .hero > :nth-child(3) {
    animation-delay: 120ms;
  }

  .showcase,
  .facts-band {
    animation: rise 500ms ease-out both;
    animation-delay: 160ms;
  }

  @keyframes rise {
    from {
      opacity: 0;
      transform: translateY(8px);
    }
    to {
      opacity: 1;
      transform: none;
    }
  }
}

@media (max-width: 30rem) {
  .hero {
    min-height: 0;
    padding-top: clamp(2rem, 8vh, 3rem);
  }

  .card-body {
    padding: 0.9rem;
  }

  .footer {
    justify-content: center;
    text-align: center;
  }
}