/* styles.css - Spider Solitaire
 * Themeable (system / light / dark / high contrast), respects reduced motion,
 * and keeps strong, always-visible focus indicators for keyboard users.
 */

/* ---- Design tokens --------------------------------------------------- */
:root {
  --font: system-ui, "Segoe UI", Roboto, Arial, sans-serif;

  --bg: #f2efe9;
  --surface: #ffffff;
  --felt: #2f6b46;          /* the table under the cards */
  --felt-text: #ffffff;
  --text: #16130f;
  --muted: #5a544c;
  --border: #b9b2a6;
  --accent: #1c5d3a;
  --accent-text: #ffffff;

  --card-bg: #ffffff;
  --card-border: #4a4a4a;
  --card-black: #141414;    /* spades / clubs */
  --card-red: #b00710;      /* hearts / diamonds */
  --card-down-a: #1d4e7a;   /* face-down card pattern */
  --card-down-b: #14395c;
  --card-selected: #ffe89a;
  --card-selected-border: #a8730a;
  --card-hint: #b7f0c4;

  --focus: #0b4fd6;         /* focus ring */
  --focus-2: #ffffff;       /* focus ring inner halo, for contrast on any bg */

  --card-w: 74px;
  --card-h: 100px;
  --card-lip: 28px;         /* how much of a covered card peeks out */
  --radius: 8px;
  --speed: 140ms;
}

@media (prefers-color-scheme: dark) {
  :root[data-theme="system"] {
    --bg: #14161a;
    --surface: #1e222a;
    --felt: #16342a;
    --text: #f2efe9;
    --muted: #b6b0a6;
    --border: #3a3f49;
    --accent: #4cae7e;
    --accent-text: #08130d;
    --focus: #6aa5ff;
  }
}

:root[data-theme="dark"] {
  --bg: #14161a;
  --surface: #1e222a;
  --felt: #16342a;
  --text: #f2efe9;
  --muted: #b6b0a6;
  --border: #3a3f49;
  --accent: #4cae7e;
  --accent-text: #08130d;
  --focus: #6aa5ff;
}

:root[data-theme="contrast"] {
  --bg: #000000;
  --surface: #000000;
  --felt: #000000;
  --felt-text: #ffffff;
  --text: #ffffff;
  --muted: #f0f0f0;
  --border: #ffffff;
  --accent: #ffff00;
  --accent-text: #000000;
  --card-bg: #ffffff;
  --card-border: #000000;
  --card-black: #000000;
  --card-red: #a00000;      /* 7.4:1 on white - AAA, and stronger than default */
  --card-down-a: #ffffff;
  --card-down-b: #ffffff;
  --card-selected: #ffff00;
  --card-selected-border: #000000;
  --card-hint: #00e5ff;
  --focus: #ffff00;
  --focus-2: #000000;
}

/* ---- Base ------------------------------------------------------------ */
* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.5;
}

h1, h2, h3, p { margin: 0 0 .5em; }

.container { padding: 0 1rem 3rem; max-width: 1200px; margin: 0 auto; }

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

.skip-link {
  position: absolute; left: 8px; top: -60px;
  background: var(--accent); color: var(--accent-text);
  padding: .6rem 1rem; border-radius: var(--radius);
  z-index: 100; transition: top var(--speed);
}
.skip-link:focus { top: 8px; }

/* Universal, unmistakable focus indicator */
:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}
/* Fallback for browsers without :focus-visible */
a:focus, button:focus, select:focus, input:focus, [tabindex]:focus {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

/* ---- Header & setup -------------------------------------------------- */
.site-header {
  display: flex; flex-wrap: wrap; align-items: center; gap: 1rem;
  padding: .75rem 1rem;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.brand { font-size: 1.3rem; font-weight: 700; margin: 0; }
.brand-mark { color: var(--accent); }

.guide-link {
  font-weight: 600;
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.guide-link:hover { filter: brightness(1.1); }

.guide-callout {
  margin: 0 0 .5rem;
  padding: .6rem .8rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
}
.guide-callout a { color: var(--accent); font-weight: 600; text-decoration: underline; text-underline-offset: 2px; }

.setup { display: flex; flex-wrap: wrap; align-items: flex-end; gap: .75rem; margin-left: auto; }
.field { display: flex; flex-direction: column; gap: .2rem; }
.field.checkbox { flex-direction: row; align-items: center; gap: .4rem; }
.field label { font-size: .85rem; font-weight: 600; color: var(--muted); }

select, input[type="range"] {
  font: inherit;
  padding: .35rem .5rem;
  color: var(--text); background: var(--surface);
  border: 1px solid var(--border); border-radius: 6px;
  min-height: 40px;
}

/* ---- Buttons --------------------------------------------------------- */
.btn {
  font: inherit; font-weight: 600;
  color: var(--text); background: var(--surface);
  border: 1px solid var(--border); border-radius: 6px;
  padding: .5rem .8rem; min-height: 40px;
  cursor: pointer;
  display: inline-flex; align-items: center; gap: .4rem;
}
.btn:hover { background: var(--bg); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-primary { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }
.btn-primary:hover { filter: brightness(1.08); background: var(--accent); }
.btn kbd {
  font: inherit; font-size: .75em; font-weight: 700;
  border: 1px solid currentColor; border-radius: 4px;
  padding: 0 .3em; opacity: .8;
}

.variant-blurb { color: var(--muted); margin: 1rem 0 .5rem; max-width: 70ch; }

.toolbar { display: flex; flex-wrap: wrap; gap: .5rem; margin: .5rem 0 1rem; }

/* ---- Status ---------------------------------------------------------- */
.status { margin: .5rem 0; }
.status-line { display: flex; flex-wrap: wrap; gap: 1.2rem; margin: 0; }
.stat { white-space: nowrap; }
.stat-label { color: var(--muted); font-size: .9rem; }
#stat-foundations, #stat-stock, #stat-moves, #stat-time, #stat-score { font-weight: 700; }

/* ---- Stock ----------------------------------------------------------- */
.stock-row { display: flex; align-items: center; gap: .8rem; margin: .5rem 0 1rem; }
.stock-pile {
  width: var(--card-w); height: var(--card-h);
  border-radius: var(--radius);
  border: 2px solid var(--card-border);
  background:
    repeating-linear-gradient(45deg, var(--card-down-a) 0 8px, var(--card-down-b) 8px 16px);
  color: #fff; cursor: pointer;
  position: relative;
  display: flex; align-items: center; justify-content: center;
}
.stock-count {
  font-weight: 800; font-size: 1.4rem;
  background: rgba(0,0,0,.55); color: #fff;
  border-radius: 6px; padding: .1rem .5rem;
}
.stock-pile[data-empty="true"] {
  background: transparent;
  border-style: dashed;
}
.stock-pile[data-empty="true"] .stock-count { background: transparent; color: var(--muted); }
.stock-help { color: var(--muted); font-size: .9rem; margin: 0; }

.board-instructions { color: var(--muted); font-size: .9rem; max-width: 70ch; }

/* ---- Tableau & cards ------------------------------------------------- */
.tableau {
  display: flex; gap: .6rem;
  align-items: flex-start;
  padding: 1rem;
  background: var(--felt);
  border-radius: var(--radius);
  overflow-x: auto;      /* wide layouts (13 columns) scroll, page never does */
  min-height: calc(var(--card-h) + 2rem);
}

.column {
  flex: 0 0 var(--card-w);
  display: flex; flex-direction: column;
  min-height: var(--card-h);
}

.card, .empty-slot {
  width: var(--card-w); height: var(--card-h);
  border-radius: var(--radius);
  position: relative;
}
/* Cards after the first overlap the one above, leaving a readable lip. */
.card + .card, .card + .empty-slot { margin-top: calc(var(--card-lip) - var(--card-h)); }

.empty-slot {
  border: 2px dashed rgba(255,255,255,.6);
  background: rgba(255,255,255,.06);
  color: var(--felt-text);
  cursor: pointer;
}
:root[data-theme="contrast"] .empty-slot { border-color: #fff; }

.card {
  border: 1.5px solid var(--card-border);
  background: var(--card-bg);
  cursor: pointer;
  padding: .25rem .35rem;
  text-align: left;
  font-weight: 800;
  transition: transform var(--speed), box-shadow var(--speed);
}
.card.down {
  background:
    repeating-linear-gradient(45deg, var(--card-down-a) 0 8px, var(--card-down-b) 8px 16px);
  border-color: var(--card-border);
  cursor: default;
}
.card .corner { font-size: 1.05rem; line-height: 1.05; display: block; }
.card .pip { font-size: 1.5rem; line-height: 1; }
.card.black { color: var(--card-black); }
.card.red { color: var(--card-red); }

/* State: selected (picked up) cards */
.card.selected {
  background: var(--card-selected);
  border-color: var(--card-selected-border);
  box-shadow: 0 0 0 2px var(--card-selected-border);
}
/* State: a hinted move */
.card.hint {
  background: var(--card-hint);
  box-shadow: 0 0 0 3px var(--accent);
}

/* Focused card lifts above its neighbours so its outline is never clipped */
.card:focus, .card:focus-visible, .empty-slot:focus, .empty-slot:focus-visible {
  z-index: 5;
  transform: translateY(-6px);
  outline: 3px solid var(--focus);
  outline-offset: 2px;
  box-shadow: 0 0 0 3px var(--focus-2);
}

/* Completed-suit tally */
.foundations { margin-top: 1rem; }

/* ---- Modals ---------------------------------------------------------- */
.modal-backdrop {
  position: fixed; inset: 0;
  background: rgba(0,0,0,.55);
  display: flex; align-items: center; justify-content: center;
  padding: 1rem; z-index: 200;
}
.modal-backdrop[hidden] { display: none; }
.modal {
  background: var(--surface); color: var(--text);
  border: 1px solid var(--border); border-radius: 12px;
  max-width: 640px; width: 100%; max-height: 90vh; overflow-y: auto;
  padding: 1.25rem 1.5rem;
}
.modal-head { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.modal-body h3 { margin-top: 1.1rem; }
.modal-actions { display: flex; gap: .6rem; margin-top: 1rem; }

.keys { border-collapse: collapse; width: 100%; }
.keys th, .keys td { text-align: left; padding: .3rem .5rem; border-bottom: 1px solid var(--border); vertical-align: top; }
.keys th[scope="row"] { white-space: nowrap; font-family: ui-monospace, "Cascadia Code", Consolas, monospace; }

.options { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 1rem; }

/* ---- Motion ---------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
  .card:focus, .card:focus-visible { transform: none; }
  .skip-link { transition: none; }
}