/*
 * opensheets.dev — plain CSS over the same token layer the component uses
 * (src/spreadsheet/styles/tokens.css, "Crisp" design). Light values on
 * :root, dark values via prefers-color-scheme. No build step, no fonts
 * fetched: system stack only.
 */

:root {
  color-scheme: light dark;

  --bg: #ffffff;
  --panel: #ffffff;
  --ink: #0f172a;
  --text: #1e293b;
  --muted: #475569;
  --faint: #94a3b8;
  --border: #e2e8f0;
  --hover: #f1f5f9;
  --accent: #0284c7;
  --accent-hov: #0369a1;
  --accent-contrast: #ffffff;
  --tabbg: #f8fafc;
  --cellbg: #ffffff;
  --headline: #cbd5e1;

  --gridline: #eef2f6;
  --grid-header-bg: #f8fafc;
  --grid-header-text: #64748b;
  --grid-header-tint: #e0f2fe;
  --grid-header-tint-text: #0369a1;
  --grid-range-fill: rgba(2, 132, 199, 0.08);

  --menu-shadow: 0 8px 24px rgba(0, 0, 0, 0.14);

  /*
   * Page-only tokens. Text-sized accent uses (links, the primary button)
   * take the palette's darker shade in light mode: #0284c7 on white is
   * 4.10:1, under the 4.5:1 needed for body text, while #0369a1 is 5.93:1.
   * Icons and the focus ring keep --accent (non-text, 3:1 is enough).
   */
  --action: var(--accent-hov);
  --action-hov: color-mix(in srgb, var(--accent-hov) 85%, black);
  --code-keyword: #0369a1;
  --code-string: #15803d;
  --code-tag: #0f172a;
  --code-attr: #6d28d9;

  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, 'Liberation Mono', monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f172a;
    --panel: #16213a;
    --ink: #f1f5f9;
    --text: #dbe4f0;
    --muted: #94a3b8;
    --faint: #64748b;
    --border: #263650;
    --hover: #22304a;
    --accent: #38bdf8;
    --accent-hov: #7dd3fc;
    --accent-contrast: #0b1424;
    --tabbg: #0b1424;
    --cellbg: #0f172a;
    --headline: #33455f;

    --gridline: #1c2a42;
    --grid-header-bg: #16213a;
    --grid-header-text: #8fa3c0;
    --grid-header-tint: #1e3a55;
    --grid-header-tint-text: #7dd3fc;
    --grid-range-fill: rgba(56, 189, 248, 0.1);

    --menu-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);

    --action: var(--accent);
    --action-hov: var(--accent-hov);
    --code-keyword: #7dd3fc;
    --code-string: #86efac;
    --code-tag: #f1f5f9;
    --code-attr: #c4b5fd;
  }
}

/* ---------- Base ---------- */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 var(--font);
  overflow-x: hidden;
}

h1,
h2,
h3 {
  color: var(--ink);
  line-height: 1.2;
  margin: 0;
  font-weight: 600;
  overflow-wrap: anywhere;
}

p {
  margin: 0;
}

a {
  color: var(--action);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.15em;
}

a:hover {
  color: var(--action-hov);
}

code,
pre,
kbd {
  font-family: var(--mono);
  font-size: 0.92em;
}

p code,
li code,
dd code {
  background: var(--hover);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.05em 0.35em;
  color: var(--ink);
  overflow-wrap: anywhere;
}

svg {
  flex: none;
}

/* Visible keyboard focus, same ring as the component */
a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip {
  position: absolute;
  left: 1rem;
  top: -3rem;
  z-index: 10;
  padding: 0.5rem 0.8rem;
  background: var(--action);
  color: var(--accent-contrast);
  border-radius: 6px;
  text-decoration: none;
}

.skip:focus {
  top: 0.75rem;
}

.wrap {
  width: min(100% - 2rem, 68rem);
  margin-inline: auto;
}

/* ---------- Header ---------- */

.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  min-height: 56px;
  padding-block: 0.5rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--ink);
  font-weight: 600;
  font-size: 15px;
  text-decoration: none;
  white-space: nowrap;
}

.brand:hover {
  color: var(--ink);
}

/* Same 26px accent tile as the demo header's .logo */
.mark {
  width: 26px;
  height: 26px;
  border-radius: 6px;
  background: var(--accent);
  color: var(--accent-contrast);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: none;
}

.site-nav {
  margin-left: auto;
}

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 0.25rem;
}

.site-nav a {
  display: inline-block;
  padding: 0.35rem 0.6rem;
  border-radius: 6px;
  color: var(--muted);
  font-size: 14px;
  text-decoration: none;
}

.site-nav a:hover {
  background: var(--hover);
  color: var(--ink);
}

/* ---------- Sections ---------- */

.section {
  padding-block: 3.5rem;
  border-top: 1px solid var(--border);
}

.section-head {
  max-width: 40rem;
  margin-bottom: 1.75rem;
}

.section h2 {
  font-size: clamp(1.4rem, 2.6vw, 1.75rem);
  margin-bottom: 0.5rem;
}

.section-head p {
  color: var(--muted);
}

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

.hero {
  padding-block: 3.5rem 2.5rem;
}

.hero h1 {
  font-size: clamp(2.25rem, 6vw, 3.25rem);
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}

.lead {
  max-width: 38rem;
  font-size: clamp(1.05rem, 2.2vw, 1.2rem);
  color: var(--muted);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 42px;
  padding: 0.4rem 1.1rem;
  border-radius: 6px;
  border: 1px solid transparent;
  font: inherit;
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.15s ease;
}

.btn-primary {
  background: var(--action);
  border-color: var(--action);
  color: var(--accent-contrast);
}

.btn-primary:hover {
  background: var(--action-hov);
  border-color: var(--action-hov);
  color: var(--accent-contrast);
}

.btn-secondary {
  background: var(--bg);
  border-color: var(--border);
  color: var(--ink);
}

.btn-secondary:hover {
  background: var(--hover);
  color: var(--ink);
}

.install-block {
  margin-top: 1.75rem;
}

.install {
  display: inline-flex;
  align-items: stretch;
  max-width: 100%;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--tabbg);
  overflow: hidden;
}

.install code {
  padding: 0.6rem 0.95rem;
  font-size: 0.95rem;
  color: var(--ink);
  white-space: nowrap;
  overflow-x: auto;
}

.install code::before {
  content: '$ ';
  color: var(--grid-header-text);
}

.copy {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0 0.85rem;
  border: 0;
  border-left: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 14px;
  cursor: pointer;
  white-space: nowrap;
  transition: background-color 0.15s ease;
}

.copy:hover {
  background: var(--hover);
  color: var(--ink);
}

.copy:focus-visible {
  outline-offset: -2px;
}

.copy .icon-check {
  display: none;
}

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

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

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

.fine {
  margin-top: 0.6rem;
  font-size: 0.9rem;
  color: var(--muted);
}

/* Callout: mirrors the demo's toast (3px accent edge) */
.callout {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  margin-top: 2rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 8px;
  background: var(--panel);
  font-size: 0.95rem;
}

.callout svg {
  color: var(--accent);
  margin-top: 0.15rem;
}

/* ---------- Screenshot slots ---------- */

.shot {
  margin: 2rem 0 0;
}

.shot-frame {
  aspect-ratio: 16 / 10;
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  background-color: var(--tabbg);
  background-image:
    linear-gradient(var(--gridline) 1px, transparent 1px),
    linear-gradient(90deg, var(--gridline) 1px, transparent 1px);
  background-size: 96px 28px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.shot-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  color: var(--muted);
  font-size: 0.9rem;
  text-align: center;
  padding: 1rem;
}

.shot figcaption {
  margin-top: 0.6rem;
  font-size: 0.9rem;
  color: var(--muted);
}

/* ---------- Feature cards ---------- */

.cards {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 17rem), 1fr));
  gap: 1rem;
}

.card {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.1rem 1.2rem 1.2rem;
  background: var(--panel);
}

.card h3 {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 1.02rem;
  margin-bottom: 0.45rem;
}

.card h3 svg {
  color: var(--accent);
}

.card p {
  color: var(--muted);
  font-size: 0.95rem;
}

/* ---------- Collaboration ---------- */

.flow {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  gap: 0.6rem;
  margin: 0 0 2rem;
}

.flow-box {
  flex: 1 1 12rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.8rem 1rem;
  background: var(--panel);
  font-size: 0.92rem;
}

.flow-box strong {
  display: block;
  color: var(--ink);
  font-weight: 600;
}

.flow-box span {
  color: var(--muted);
}

.flow-box.is-optional {
  border-style: dashed;
}

.flow-arrow {
  align-self: center;
  color: var(--grid-header-text);
  padding: 0 0.1rem;
}

.collab-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 20rem), 1fr));
  gap: 1rem 2rem;
  margin: 0;
}

.collab-list dt {
  color: var(--ink);
  font-weight: 600;
}

.collab-list dd {
  margin: 0.2rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.caveat {
  margin-top: 2rem;
  color: var(--muted);
  font-size: 0.95rem;
  max-width: 46rem;
}

/* ---------- Use it ---------- */

.code {
  margin: 0;
  padding: 1rem 1.1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--tabbg);
  color: var(--text);
  font-size: 0.88rem;
  line-height: 1.6;
  overflow-x: auto;
  tab-size: 2;
}

.code .k { color: var(--code-keyword); }
.code .s { color: var(--code-string); }
.code .t { color: var(--code-tag); font-weight: 600; }
.code .a { color: var(--code-attr); }

.entries {
  margin: 1.5rem 0 0;
  padding-left: 1.25rem;
}

.entries li {
  margin-bottom: 0.5rem;
  color: var(--muted);
}

.entries li strong,
.facts li strong {
  color: var(--ink);
  font-weight: 600;
}

/* ---------- How it is built ---------- */

.facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 20rem), 1fr));
  gap: 0.75rem 2rem;
}

.facts li {
  display: flex;
  gap: 0.6rem;
  align-items: flex-start;
  color: var(--muted);
  padding: 0.35rem 0;
}

.facts li svg {
  color: var(--accent);
  margin-top: 0.3rem;
}

.facts-note {
  margin-top: 1.5rem;
  color: var(--muted);
  font-size: 0.95rem;
}

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

.site-footer {
  border-top: 1px solid var(--border);
  background: var(--tabbg);
  padding-block: 1.5rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.site-footer .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1.5rem;
}

.site-footer ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.25rem;
  margin-left: auto;
}

.site-footer a {
  color: var(--muted);
}

.site-footer a:hover {
  color: var(--ink);
}

/* ---------- 404 ---------- */

.notfound {
  padding-block: 5rem;
  max-width: 36rem;
}

.notfound h1 {
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  margin-bottom: 0.75rem;
}

.notfound p {
  color: var(--muted);
}

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

/* ---------- Narrow screens ---------- */

@media (max-width: 480px) {
  .section {
    padding-block: 2.5rem;
  }

  .hero {
    padding-block: 2.5rem 2rem;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }

  .install {
    display: flex;
  }

  /* At 360px the prompt plus the button is a few pixels too wide */
  .install code {
    flex: 1;
    font-size: 0.86rem;
    padding-inline: 0.8rem;
  }

  .install code::before {
    content: none;
  }

  .site-header .wrap {
    gap: 0.5rem 0.75rem;
  }

  .site-nav a {
    padding: 0.35rem 0.45rem;
  }
}