/* Shared tokens and the tools landing page.
   Anything specific to the sudoku grid lives in sudoku.css. */

:root {
  color-scheme: light dark;

  --paper: #fbf8f3;
  --card: #ffffff;
  --ink: #1d1b18;
  --ink-soft: #56514a;
  --ink-faint: #8b857c;
  --line: #ddd6ca;
  --line-strong: #2f2b25;

  --accent: #1f5f4b;          /* placements, primary action */
  --accent-soft: #e3f0eb;
  --focus: #b4600f;           /* the square being explained */
  --focus-soft: #fbeadb;
  --warn: #a3271f;
  --warn-soft: #fae5e3;

  --radius: 10px;
  --pad: clamp(1rem, 4vw, 2rem);
  --font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #171614;
    --card: #211f1c;
    --ink: #f2ede4;
    --ink-soft: #b8b1a6;
    --ink-faint: #857e73;
    --line: #3a3630;
    --line-strong: #cdc6ba;

    --accent: #6fd0ac;
    --accent-soft: #1d3b32;
    --focus: #f0a35a;
    --focus-soft: #3d2a16;
    --warn: #f08a80;
    --warn-soft: #3d1f1c;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: var(--pad);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font);
  font-size: 1.0625rem;
  line-height: 1.55;
  -webkit-text-size-adjust: 100%;
}

.wrap { max-width: 46rem; margin: 0 auto; }

h1 {
  font-size: clamp(1.6rem, 5vw, 2.1rem);
  line-height: 1.2;
  margin: 0 0 .3rem;
  letter-spacing: -0.01em;
}

.tagline { margin: 0 0 2.2rem; color: var(--ink-soft); }

/* --- tool list ---------------------------------------------------------- */

.tools { list-style: none; margin: 0; padding: 0; display: grid; gap: 1rem; }

.tool a {
  display: block;
  padding: 1.15rem 1.25rem;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  text-decoration: none;
  color: inherit;
}

.tool a:hover,
.tool a:focus-visible { border-color: var(--accent); outline: none; }

.tool a:focus-visible { box-shadow: 0 0 0 3px var(--accent-soft); }

.tool h2 { margin: 0 0 .2rem; font-size: 1.15rem; }
.tool p  { margin: 0; color: var(--ink-soft); font-size: .95rem; }

.tool-soon {
  padding: 1.15rem 1.25rem;
  border: 1px dashed var(--line);
  border-radius: var(--radius);
  color: var(--ink-faint);
  font-size: .95rem;
}

footer {
  margin-top: 3rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--line);
  color: var(--ink-faint);
  font-size: .875rem;
}

footer a { color: inherit; }

.langbar {
  display: flex;
  justify-content: flex-end;
  gap: .35rem;
  margin-bottom: .9rem;
}

.langbar button {
  padding: .3rem .7rem;
  font-family: inherit;
  font-size: .875rem;
  color: var(--ink-soft);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 999px;
  cursor: pointer;
}

.langbar button:hover { color: var(--ink); border-color: var(--accent); }

.langbar button[aria-pressed="true"] {
  color: var(--paper);
  background: var(--accent);
  border-color: var(--accent);
}

@media (prefers-color-scheme: dark) {
  .langbar button[aria-pressed="true"] { color: #10201b; }
}

.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;
}

.back {
  display: inline-block;
  margin-bottom: 1rem;
  color: var(--ink-soft);
  font-size: .9rem;
  text-decoration: none;
}

.back:hover { text-decoration: underline; }