/*
 * Minesweeper front end styles.
 * Plain CSS, no build step and no external assets. Dark navy/slate surfaces
 * with restrained teal (safe / positive) and amber (flags / estimates) accents.
 */

:root {
  color-scheme: dark;
  --bg: #0a1020;
  --surface: #101a2c;
  --surface-2: #0d1628;
  --surface-3: #1a2842;
  --well: #0b1324;
  --line: #22314b;
  --line-2: #2e4060;
  --text: #e6edf6;
  --text-2: #b8c4d6;
  --muted: #8b9ab2;
  --teal: #2dd4bf;
  --teal-2: #14b8a6;
  --amber: #fbbf24;
  --red: #f87171;
  --red-2: #ef4444;
  --focus: #fde68a;
  --radius-lg: 16px;
  --radius: 12px;
  --shadow: 0 14px 40px rgba(2, 6, 23, 0.45);
  --font: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --cell: 30px;
  --gap: 2px;
  --hidden-top: #3b4d6b;
  --hidden-bottom: #31415c;
  --revealed: #131d30;
  --advice-ink: #f8fafc;
  --advice-edge: #0b1120;
}

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

[hidden] {
  display: none !important;
}

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

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.5;
  color: var(--text);
  background:
    radial-gradient(1100px 520px at 8% -8%, rgba(45, 212, 191, 0.08), transparent 62%),
    radial-gradient(900px 480px at 105% -4%, rgba(251, 191, 36, 0.05), transparent 60%),
    var(--bg);
  background-attachment: fixed;
}

h1,
h2,
h3,
p {
  margin: 0;
}

button,
input {
  font: inherit;
  color: inherit;
}

button {
  -webkit-tap-highlight-color: transparent;
}

:where(button, a, input, summary):focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

code {
  font-family: var(--mono);
  font-size: 0.92em;
  padding: 1px 5px;
  border-radius: 5px;
  background: var(--surface-2);
  border: 1px solid var(--line);
}

kbd {
  display: inline-block;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.5;
  padding: 0 6px;
  border-radius: 5px;
  border: 1px solid var(--line-2);
  border-bottom-width: 2px;
  background: var(--surface-2);
  color: var(--text);
}

.sprite {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}

.icon {
  display: block;
  width: 18px;
  height: 18px;
  flex: none;
  pointer-events: none;
}

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

.skip-link {
  position: absolute;
  left: 12px;
  top: -64px;
  z-index: 100;
  padding: 8px 14px;
  border-radius: 8px;
  background: var(--teal);
  color: #042f2e;
  font-weight: 700;
  text-decoration: none;
}

.skip-link:focus {
  top: 12px;
}

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

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px 12px;
  max-width: 1480px;
  margin: 0 auto;
  padding: 16px 22px 6px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  flex: none;
  border-radius: 12px;
  background: linear-gradient(145deg, #0f766e, #134e4a);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.16), 0 8px 22px rgba(20, 184, 166, 0.22);
  --mine-body: #ccfbf1;
  --mine-shine: #115e59;
}

.brand-mark .icon {
  width: 27px;
  height: 27px;
}

.brand-text h1 {
  font-size: 21px;
  line-height: 1.15;
  letter-spacing: -0.01em;
}

.brand-text p {
  font-size: 13px;
  color: var(--muted);
}

.engine-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: none;
  padding: 5px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--surface);
  font-size: 13px;
  color: var(--text-2);
}

.engine-status-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #64748b;
}

.engine-status[data-state="ready"] .engine-status-dot {
  background: var(--teal);
  box-shadow: 0 0 0 3px rgba(45, 212, 191, 0.18);
}

.engine-status[data-state="loading"] .engine-status-dot {
  background: var(--amber);
  animation: pulse 1.2s ease-in-out infinite;
}

.engine-status[data-state="error"] {
  border-color: rgba(248, 113, 113, 0.5);
  color: #fecaca;
}

.engine-status[data-state="error"] .engine-status-dot {
  background: var(--red-2);
  box-shadow: 0 0 0 3px rgba(248, 113, 113, 0.2);
}

/* ------------------------------------------------------------------ Layout */

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  align-items: start;
  gap: 20px;
  max-width: 1480px;
  margin: 0 auto;
  padding: 12px 22px 24px;
}

.game-card {
  min-width: 0;
  padding: 14px 16px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-width: 0;
}

.app-footer {
  max-width: 1480px;
  margin: 0 auto;
  padding: 0 22px 28px;
  font-size: 12.5px;
  color: var(--muted);
}

.noscript {
  max-width: 640px;
  margin: 24px auto;
  padding: 12px 16px;
  border-radius: 10px;
  border: 1px solid rgba(248, 113, 113, 0.5);
  background: rgba(127, 29, 29, 0.3);
}

/* ----------------------------------------------------------------- Buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 40px;
  padding: 0 16px;
  border: 1px solid var(--line-2);
  border-radius: 10px;
  background: var(--surface-3);
  color: var(--text);
  font-size: 14.5px;
  font-weight: 650;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color 0.15s, border-color 0.15s, transform 0.05s;
}

.btn:hover {
  background: #22324f;
  border-color: #3a5078;
}

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

.btn .icon {
  width: 17px;
  height: 17px;
}

.btn-primary {
  border-color: #2dd4bf;
  background: linear-gradient(180deg, #2dd4bf, #14b8a6);
  color: #042f2e;
}

.btn-primary:hover {
  border-color: #5eead4;
  background: linear-gradient(180deg, #5eead4, #2dd4bf);
}

.btn-accent {
  border-color: rgba(251, 191, 36, 0.6);
  background: rgba(251, 191, 36, 0.14);
  color: #fde68a;
}

.btn-accent:hover {
  border-color: #fbbf24;
  background: rgba(251, 191, 36, 0.22);
}

.btn-small {
  min-height: 32px;
  padding: 0 12px;
  font-size: 13.5px;
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.icon-btn {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--well);
  color: var(--text-2);
  cursor: pointer;
}

.icon-btn:hover:not([aria-disabled="true"]) {
  color: var(--text);
  border-color: var(--line-2);
}

.icon-btn[aria-disabled="true"] {
  opacity: 0.4;
  cursor: not-allowed;
}

/* ----------------------------------------------------------------- Toolbar */

.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px 14px;
}

.presets {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  min-width: 0;
}

.preset {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  gap: 1px;
  min-height: 46px;
  padding: 6px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface-2);
  text-align: left;
  cursor: pointer;
  transition: background-color 0.15s, border-color 0.15s;
}

.preset:hover {
  border-color: var(--line-2);
  background: #111c31;
}

.preset-name {
  font-size: 14px;
  font-weight: 650;
  line-height: 1.2;
}

.preset-dims {
  font-size: 12px;
  line-height: 1.25;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.preset[aria-pressed="true"] {
  border-color: rgba(45, 212, 191, 0.65);
  background: rgba(20, 184, 166, 0.13);
  box-shadow: inset 0 0 0 1px rgba(45, 212, 191, 0.22);
}

.preset[aria-pressed="true"] .preset-dims {
  color: #99f6e4;
}

.preset[aria-expanded="true"] {
  border-color: rgba(251, 191, 36, 0.6);
}

.new-game {
  flex: none;
}

/* ------------------------------------------------------------- Custom form */

.custom-form {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 10px 14px;
  margin-top: 12px;
  padding: 12px 14px;
  border: 1px solid rgba(251, 191, 36, 0.3);
  border-radius: var(--radius);
  background: var(--surface-2);
}

.field {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1 1 120px;
  min-width: 110px;
  max-width: 180px;
}

.field label {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-2);
}

.field input {
  height: 40px;
  padding: 0 10px;
  border: 1px solid var(--line-2);
  border-radius: 9px;
  background: #0a1222;
  font-size: 16px;
  font-variant-numeric: tabular-nums;
}

.field input:focus {
  outline: none;
  border-color: var(--teal);
  box-shadow: 0 0 0 3px rgba(45, 212, 191, 0.28);
}

.field input[aria-invalid="true"] {
  border-color: var(--red);
  box-shadow: 0 0 0 3px rgba(248, 113, 113, 0.2);
}

.field-hint {
  font-size: 12px;
  color: var(--muted);
}

.field-error,
.form-error {
  font-size: 12.5px;
  color: #fca5a5;
}

.field-error:empty,
.form-error:empty {
  display: none;
}

.custom-actions {
  display: flex;
  align-items: flex-end;
  padding-top: 22px;
}

.form-error {
  flex-basis: 100%;
  font-size: 13.5px;
}

/* --------------------------------------------------------------------- HUD */

.hud {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px 16px;
  padding: 12px 0;
}

.counters {
  display: flex;
  align-items: center;
  gap: 10px;
}

.counter {
  display: flex;
  align-items: center;
  gap: 9px;
  min-width: 118px;
  padding: 6px 12px 6px 10px;
  border: 1px solid var(--line);
  border-radius: 11px;
  background: var(--well);
}

.counter-icon {
  width: 20px;
  height: 20px;
  color: var(--muted);
  --mine-body: #8b9ab2;
  --mine-shine: #0b1324;
}

.counter-body {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.counter-value {
  font-family: var(--mono);
  font-size: 20px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--amber);
}

.counter + .face + .counter .counter-value {
  color: var(--teal);
}

.counter-label {
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.counter.is-over {
  border-color: rgba(248, 113, 113, 0.5);
}

.counter.is-over .counter-value,
.counter.is-over .counter-label {
  color: #fca5a5;
}

.face {
  display: grid;
  place-items: center;
  width: 50px;
  height: 50px;
  flex: none;
  padding: 0;
  border: 1px solid var(--line-2);
  border-radius: 13px;
  background: linear-gradient(180deg, #24324d, #1a263b);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08), 0 3px 8px rgba(0, 0, 0, 0.35);
  cursor: pointer;
}

.face:hover {
  border-color: #46608f;
}

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

.face-icon {
  width: 36px;
  height: 36px;
  pointer-events: none;
}

.hud-controls {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.autosolve-status {
  margin: 10px 0 0;
  padding: 9px 12px;
  border-left: 3px solid var(--teal-2);
  border-radius: 4px;
  background: rgba(20, 184, 166, 0.08);
  color: var(--text-2);
  font-size: 0.9rem;
}

/* Move advice below the board: changing text here never moves the board. */
.advice {
  display: flex;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 6px 10px;
  margin: 10px 0 0;
  padding: 9px 12px;
  border-left: 3px dashed var(--advice-ink);
  border-radius: 4px;
  background: rgba(148, 163, 184, 0.08);
  color: var(--text-2);
  font-size: 0.9rem;
}

.advice[data-state="error"] {
  border-left-color: var(--red);
}

.advice-badge {
  width: 20px;
  height: 20px;
  flex: none;
  margin-top: 1px;
}

.advice-body {
  flex: 1 1 16em;
  min-width: 0;
}

.advice-title {
  font-weight: 650;
  color: var(--text);
}

.advice-detail:empty {
  display: none;
}

.advice .btn {
  align-self: center;
}

.segmented {
  display: inline-flex;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 11px;
  background: var(--well);
}

.segment {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 36px;
  padding: 0 12px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--text-2);
  font-size: 14px;
  font-weight: 650;
  cursor: pointer;
}

.segment .icon {
  width: 16px;
  height: 16px;
}

.segment:hover {
  color: var(--text);
}

.segment[aria-pressed="true"] {
  background: var(--surface-3);
  color: var(--text);
  box-shadow: inset 0 0 0 1px var(--line-2);
}

#mode-flag[aria-pressed="true"] {
  background: rgba(251, 191, 36, 0.16);
  color: #fde68a;
  box-shadow: inset 0 0 0 1px rgba(251, 191, 36, 0.55);
}

.switch {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 4px 14px 4px 7px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--well);
  font-size: 14.5px;
  font-weight: 700;
  cursor: pointer;
  transition: border-color 0.2s, background-color 0.2s;
}

.switch:hover {
  border-color: var(--line-2);
}

.switch-track {
  position: relative;
  width: 44px;
  height: 26px;
  flex: none;
  border-radius: 999px;
  background: #2a3953;
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.45);
  transition: background-color 0.2s;
}

.switch-thumb {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #cbd5e1;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.45);
  transition: transform 0.2s;
}

.switch[aria-checked="true"] {
  border-color: rgba(45, 212, 191, 0.6);
  background: rgba(20, 184, 166, 0.12);
}

.switch[aria-checked="true"] .switch-track {
  background: var(--teal-2);
}

.switch[aria-checked="true"] .switch-thumb {
  transform: translateX(18px);
  background: #f0fdfa;
}

.zoom {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.zoom-fit {
  min-width: 44px;
  height: 38px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--well);
  color: var(--text-2);
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
}

.zoom-fit:hover {
  color: var(--text);
  border-color: var(--line-2);
}

.zoom-fit[aria-pressed="true"] {
  border-color: rgba(45, 212, 191, 0.55);
  color: #99f6e4;
}

/* ---------------------------------------------------- Notices and results */

.notice {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 10px;
  padding: 10px 12px;
  border: 1px solid;
  border-radius: var(--radius);
  animation: pop 0.25s ease-out;
}

.notice[data-tone="error"] {
  border-color: rgba(248, 113, 113, 0.5);
  background: rgba(127, 29, 29, 0.3);
}

.notice[data-tone="warning"] {
  border-color: rgba(251, 191, 36, 0.45);
  background: rgba(120, 53, 15, 0.3);
}

.notice[data-tone="info"] {
  border-color: rgba(45, 212, 191, 0.4);
  background: rgba(19, 78, 74, 0.32);
}

.notice-icon {
  width: 20px;
  height: 20px;
  margin-top: 2px;
}

.notice[data-tone="error"] .notice-icon {
  color: #fca5a5;
}

.notice[data-tone="warning"] .notice-icon {
  color: #fcd34d;
}

.notice[data-tone="info"] .notice-icon {
  color: #5eead4;
}

.notice-body {
  flex: 1;
  min-width: 0;
}

.notice-title {
  display: block;
  font-weight: 700;
}

.notice-message {
  font-size: 14px;
  color: var(--text-2);
}

.notice-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
}

.notice-close {
  width: 32px;
  height: 32px;
  margin: -4px -4px 0 0;
  border-color: transparent;
  background: transparent;
}

.result {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px 14px;
  margin-top: 10px;
  padding: 10px 12px 10px 14px;
  border: 1px solid;
  border-radius: var(--radius);
  animation: pop 0.3s ease-out;
}

.result[data-outcome="won"] {
  border-color: rgba(45, 212, 191, 0.55);
  background: linear-gradient(90deg, rgba(20, 184, 166, 0.24), rgba(20, 184, 166, 0.05));
}

.result[data-outcome="lost"] {
  border-color: rgba(248, 113, 113, 0.55);
  background: linear-gradient(90deg, rgba(239, 68, 68, 0.24), rgba(239, 68, 68, 0.05));
}

.result-icon {
  width: 30px;
  height: 30px;
}

.result[data-outcome="won"] .result-icon {
  color: var(--teal);
}

.result[data-outcome="lost"] .result-icon {
  --mine-body: #fca5a5;
  --mine-shine: #450a0a;
}

.result-text {
  display: flex;
  flex: 1 1 220px;
  flex-direction: column;
  min-width: 0;
}

.result-text strong {
  font-size: 16.5px;
}

.result-text span {
  font-size: 13.5px;
  color: var(--text-2);
}

/* ------------------------------------------------------------------- Board */

.board-frame {
  position: relative;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: radial-gradient(120% 90% at 50% 0%, #0f1a2f, #0a1120);
  box-shadow: inset 0 2px 16px rgba(0, 0, 0, 0.45);
  transition: border-color 0.3s, box-shadow 0.3s;
}

.board-frame[data-status="won"] {
  border-color: rgba(45, 212, 191, 0.75);
  box-shadow: 0 0 0 3px rgba(45, 212, 191, 0.14), inset 0 2px 16px rgba(0, 0, 0, 0.45);
}

.board-frame[data-status="lost"] {
  border-color: rgba(248, 113, 113, 0.75);
  box-shadow: 0 0 0 3px rgba(248, 113, 113, 0.14), inset 0 2px 16px rgba(0, 0, 0, 0.45);
}

.board-scroller {
  display: flex;
  min-height: 240px;
  max-height: max(340px, calc(100vh - 250px));
  max-height: max(340px, calc(100dvh - 250px));
  padding: 14px;
  overflow: auto;
  border-radius: inherit;
  scroll-padding: 12px;
  scrollbar-width: thin;
  scrollbar-color: #3b4d6b transparent;
}

.board {
  display: flex;
  flex-direction: column;
  gap: var(--gap);
  flex: none;
  margin: auto;
  padding: 7px;
  border-radius: 10px;
  background: #0c1424;
  box-shadow: inset 0 0 0 1px rgba(148, 163, 184, 0.1);
  touch-action: manipulation;
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
  -webkit-tap-highlight-color: transparent;
}

.board-row {
  display: flex;
  gap: var(--gap);
}

.cell {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 var(--cell);
  width: var(--cell);
  height: var(--cell);
  border-radius: max(3px, calc(var(--cell) * 0.13));
  font-size: calc(var(--cell) * 0.56);
  font-weight: 800;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--text);
  cursor: pointer;
  outline: none;
}

.cell .icon {
  width: 66%;
  height: 66%;
}

.cell.is-hidden {
  background: linear-gradient(180deg, var(--hidden-top), var(--hidden-bottom));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.15), inset 0 -2px 0 rgba(2, 6, 23, 0.35);
}

@media (hover: hover) {
  .board[data-interactive="true"] .cell.is-hidden:not(.is-flagged):not(.has-odds):hover {
    --hidden-top: #475d82;
    --hidden-bottom: #3a4e70;
  }

  .board[data-interactive="true"] .cell.has-odds:hover {
    filter: brightness(1.15);
  }
}

.board[data-interactive="true"] .cell.is-hidden:not(.is-flagged):active {
  background: var(--revealed);
  box-shadow: inset 0 1px 3px rgba(2, 6, 23, 0.7);
  filter: none;
}

.board[data-interactive="false"] .cell,
.cell.is-revealed {
  cursor: default;
}

.board[data-interactive="true"] .cell.is-number {
  cursor: pointer;
}

.cell.is-revealed {
  background: var(--revealed);
  box-shadow: inset 0 0 0 1px rgba(148, 163, 184, 0.07);
}

.cell.n1 { color: #60a5fa; }
.cell.n2 { color: #4ade80; }
.cell.n3 { color: #f87171; }
.cell.n4 { color: #c084fc; }
.cell.n5 { color: #fb923c; }
.cell.n6 { color: #2dd4bf; }
.cell.n7 { color: #e5e7eb; }
.cell.n8 { color: #94a3b8; }

.cell.is-mine {
  background: #8795ab;
  box-shadow: inset 0 0 0 1px rgba(15, 23, 42, 0.4);
  --mine-body: #0b1120;
  --mine-shine: #f8fafc;
}

.cell.is-exploded {
  background: #dc2626;
  box-shadow: inset 0 0 0 2px #fecaca;
  animation: boom 0.6s ease-out;
}

.cell.is-wrong-flag {
  --hidden-top: #553247;
  --hidden-bottom: #45283a;
}

.cell.is-auto-flag {
  --flag-cloth: #5eead4;
}

.board[data-status="lost"] .cell.is-hidden:not(.is-flagged) {
  opacity: 0.72;
}

.cell.is-peek {
  background: var(--revealed) !important;
  box-shadow: inset 0 1px 3px rgba(2, 6, 23, 0.7) !important;
  filter: none !important;
}

/* Odds overlay on hidden cells. */
.cell.has-odds {
  background: var(--heat-bg);
  color: var(--heat-fg);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.14), inset 0 -2px 0 rgba(2, 6, 23, 0.3);
}

.odds {
  font-size: max(8px, calc(var(--cell) * 0.35));
  font-weight: 700;
  letter-spacing: -0.03em;
  white-space: nowrap;
  pointer-events: none;
}

.odds.odds-long {
  font-size: max(7.5px, calc(var(--cell) * 0.29));
  letter-spacing: -0.05em;
}

.cell.has-odds .odds-icon {
  width: 58%;
  height: 58%;
}

.cell.has-odds.is-flagged .corner-flag {
  position: absolute;
  top: 1px;
  left: 1px;
  width: 42%;
  height: 42%;
  --flag-edge: rgba(15, 23, 42, 0.8);
}

.cell.has-odds.is-flagged .odds {
  font-size: max(8px, calc(var(--cell) * 0.31));
  transform: translateY(24%);
}

.cell.has-odds.is-flagged .odds.odds-long {
  font-size: max(7.5px, calc(var(--cell) * 0.27));
}

.cell.has-odds.is-flagged .odds-icon {
  width: 46%;
  height: 46%;
  transform: translate(12%, 16%);
}

/* The suggested next move: a dashed ring (a pattern, not only a color) and
   a corner target, drawn over the odds without replacing them. ::after is
   the keyboard focus ring. */
.cell.is-advised::before,
.legend-cell.is-advised::before {
  content: "";
  position: absolute;
  inset: 1px;
  border: 2px dashed var(--advice-ink);
  border-radius: max(3px, calc(var(--cell) * 0.11));
  box-shadow: 0 0 0 1px var(--advice-edge), inset 0 0 0 1px var(--advice-edge);
  pointer-events: none;
}

.legend-cell.is-advised {
  position: relative;
}

.cell .icon.advice-icon,
.legend-cell .icon.advice-icon {
  position: absolute;
  top: 1px;
  right: 1px;
  width: 38%;
  height: 38%;
  pointer-events: none;
}

.cell.has-odds.is-advised .odds {
  font-size: max(8px, calc(var(--cell) * 0.31));
  transform: translateY(24%);
}

.cell.has-odds.is-advised .odds.odds-long {
  font-size: max(7.5px, calc(var(--cell) * 0.27));
}

.legend-cell.is-advised .odds {
  transform: translateY(24%);
}

.is-proven-safe {
  --heat-bg: #0c4a43;
  --heat-fg: #5eead4;
}

.cell.is-proven-safe,
.legend-cell.is-proven-safe {
  box-shadow: inset 0 0 0 2px #2dd4bf, inset 0 1px 0 rgba(255, 255, 255, 0.12);
}

.is-proven-mine {
  --heat-bg: #6f1a24;
  --heat-fg: #fecaca;
  --mine-body: #fecaca;
  --mine-shine: #6f1a24;
}

.cell.is-proven-mine,
.legend-cell.is-proven-mine {
  box-shadow: inset 0 0 0 2px #f87171, inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

/* Heat scale: teal for low risk through amber to red for high risk.
   Text colors keep at least 5:1 contrast against each background. */
.heat-0 { --heat-bg: #0f3d3b; --heat-fg: #a7f3e6; }
.heat-1 { --heat-bg: #124d47; --heat-fg: #bff7ec; }
.heat-2 { --heat-bg: #1c5e4f; --heat-fg: #d1fae5; }
.heat-3 { --heat-bg: #35683f; --heat-fg: #ecfccb; }
.heat-4 { --heat-bg: #56762f; --heat-fg: #fefce8; }
.heat-5 { --heat-bg: #b8982a; --heat-fg: #1c1400; }
.heat-6 { --heat-bg: #d19a2c; --heat-fg: #1f1300; }
.heat-7 { --heat-bg: #e2862e; --heat-fg: #1f0f00; }
.heat-8 { --heat-bg: #e8672f; --heat-fg: #1a0802; }
.heat-9 { --heat-bg: #c93a2b; --heat-fg: #ffffff; }
.heat-10 { --heat-bg: #a51d2d; --heat-fg: #ffffff; }

.cell.heat-5,
.cell.heat-6,
.cell.heat-7,
.cell.heat-8 {
  --flag-pole: #1f1300;
}

/* Keyboard focus ring drawn on a pseudo element so state rings stay visible. */
.cell:focus-visible {
  z-index: 2;
}

.cell:focus-visible::after {
  content: "";
  position: absolute;
  inset: -4px;
  border: 3px solid var(--focus);
  border-radius: max(5px, calc(var(--cell) * 0.2));
  box-shadow: 0 0 0 2px #0a1020, inset 0 0 0 1px #0a1020, 0 0 16px 2px rgba(253, 230, 138, 0.35);
  pointer-events: none;
}

.board-empty {
  display: flex;
  margin: auto;
  padding: 28px 16px;
  text-align: center;
}

.board-empty-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  max-width: 420px;
}

.board-empty-icon {
  width: 36px;
  height: 36px;
  color: #fca5a5;
}

.board-empty-title {
  font-size: 17px;
  font-weight: 700;
}

.board-empty-text {
  color: var(--text-2);
  font-size: 14px;
}

.spinner {
  display: inline-block;
  width: 30px;
  height: 30px;
  flex: none;
  border: 3px solid rgba(148, 163, 184, 0.25);
  border-top-color: var(--teal);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.board-footer {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 4px 16px;
  margin-top: 10px;
  font-size: 13.5px;
}

.inspector {
  min-height: 1.5em;
  color: var(--text-2);
  font-variant-numeric: tabular-nums;
}

.inspector[data-tone="hint"] {
  color: #fde68a;
}

.game-meta {
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

/* ------------------------------------------------------------- Side panels */

.panel {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
}

.panel h2 {
  font-size: 16px;
  letter-spacing: -0.005em;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 8px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 2px 10px;
  border: 1px solid var(--line-2);
  border-radius: 999px;
  background: var(--surface-2);
  font-size: 12.5px;
  font-weight: 700;
  color: var(--text-2);
  white-space: nowrap;
}

.badge[data-tone="exact"] {
  border-color: rgba(45, 212, 191, 0.55);
  background: rgba(20, 184, 166, 0.13);
  color: #5eead4;
}

.badge[data-tone="estimate"] {
  border-color: rgba(251, 191, 36, 0.55);
  background: rgba(251, 191, 36, 0.11);
  color: #fcd34d;
}

.badge[data-tone="error"] {
  border-color: rgba(248, 113, 113, 0.55);
  background: rgba(127, 29, 29, 0.3);
  color: #fca5a5;
}

.badge[data-tone="busy"] {
  border-color: rgba(147, 197, 253, 0.45);
  color: #bfdbfe;
}

.badge[data-tone="busy"]::before {
  content: "";
  width: 10px;
  height: 10px;
  border: 2px solid rgba(191, 219, 254, 0.3);
  border-top-color: #bfdbfe;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.odds-message {
  font-size: 14px;
}

.odds-detail {
  margin-top: 6px;
  font-size: 13px;
  color: var(--muted);
}

.odds-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 10px 0 0;
  padding: 0;
  list-style: none;
}

.odds-meta li {
  padding: 2px 9px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface-2);
  font-size: 12px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.odds-meta li b {
  font-weight: 700;
  color: var(--text);
}

#odds-retry {
  margin-top: 10px;
}

.odds-panel[data-phase="off"] .legend {
  opacity: 0.8;
}

.legend,
.explain {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.legend-title {
  margin-bottom: 8px;
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.heat-scale {
  display: grid;
  grid-template-columns: repeat(11, 1fr);
  gap: 2px;
  height: 16px;
}

.heat-swatch {
  border-radius: 3px;
  background: var(--heat-bg);
}

.heat-labels {
  display: flex;
  justify-content: space-between;
  margin-top: 4px;
  font-size: 12px;
  color: var(--text-2);
  font-variant-numeric: tabular-nums;
}

.heat-words {
  margin-top: 0;
  color: var(--muted);
}

.legend-keys {
  display: grid;
  gap: 7px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

.legend-keys li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13.5px;
  color: var(--text-2);
}

.legend-keys strong {
  font-weight: 650;
  color: var(--text);
}

.legend-cell {
  --cell: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  flex: none;
  border-radius: 5px;
  background: var(--heat-bg);
  color: var(--heat-fg);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.14), inset 0 -2px 0 rgba(2, 6, 23, 0.3);
}

.legend-cell .odds {
  font-size: 11.5px;
}

.legend-cell .icon {
  width: 60%;
  height: 60%;
}

.legend-cell.is-plain {
  background: linear-gradient(180deg, var(--hidden-top), var(--hidden-bottom));
}

.explain p {
  margin-bottom: 8px;
  font-size: 13.5px;
  color: var(--text-2);
}

.tag {
  display: inline-block;
  margin-right: 4px;
  padding: 0 7px;
  border-radius: 6px;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.04em;
  line-height: 1.6;
  text-transform: uppercase;
  vertical-align: 1px;
}

.tag-exact {
  background: rgba(20, 184, 166, 0.15);
  color: #5eead4;
}

.tag-estimate {
  background: rgba(251, 191, 36, 0.13);
  color: #fcd34d;
}

.tag-advice {
  background: rgba(248, 250, 252, 0.1);
  color: var(--advice-ink);
}

.flag-note,
.safe-note {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 0;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface-2);
  font-size: 13.5px;
  color: var(--text-2);
}

.flag-note .icon,
.safe-note .icon {
  width: 20px;
  height: 20px;
  margin-top: 1px;
}

.safe-note .icon {
  color: var(--teal);
}

.safe-note strong {
  color: var(--text);
}

.howto-lead {
  margin: 6px 0 12px;
  font-size: 13.5px;
  color: var(--text-2);
}

.controls-list {
  display: grid;
  gap: 10px;
  margin: 0 0 12px;
  padding: 0;
  list-style: none;
}

.controls-list li {
  display: grid;
  gap: 3px;
  font-size: 13.5px;
  color: var(--text-2);
}

.keys {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px;
  font-size: 12.5px;
  color: var(--muted);
}

/* -------------------------------------------------------------- Animations */

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes pulse {
  50% {
    opacity: 0.35;
  }
}

@keyframes pop {
  from {
    opacity: 0;
    transform: translateY(-3px);
  }

  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes boom {
  0% {
    box-shadow: inset 0 0 0 2px #fecaca, 0 0 0 0 rgba(239, 68, 68, 0.85);
  }

  100% {
    box-shadow: inset 0 0 0 2px #fecaca, 0 0 0 16px rgba(239, 68, 68, 0);
  }
}

/* -------------------------------------------------------------- Responsive */

@media (max-width: 1180px) {
  .layout {
    grid-template-columns: minmax(0, 1fr) 300px;
  }
}

@media (max-width: 980px) {
  .layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .sidebar {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    align-items: start;
  }
}

@media (max-width: 640px) {
  body {
    font-size: 14.5px;
  }

  .app-header {
    padding: 10px 12px 2px;
  }

  .brand-mark {
    width: 36px;
    height: 36px;
    border-radius: 10px;
  }

  .brand-mark .icon {
    width: 23px;
    height: 23px;
  }

  .brand-text h1 {
    font-size: 18px;
  }

  .brand-text p {
    font-size: 12px;
  }

  .engine-status {
    padding: 4px 10px;
    font-size: 12px;
  }

  .layout {
    gap: 12px;
    padding: 8px 8px 18px;
  }

  .game-card {
    padding: 10px;
    border-radius: 14px;
  }

  .toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .presets {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .preset {
    min-width: 0;
    padding: 6px 8px;
  }

  .preset-name {
    font-size: 13px;
  }

  .preset-dims {
    font-size: 11px;
    white-space: normal;
  }

  .new-game {
    width: 100%;
  }

  .field {
    max-width: none;
  }

  .custom-actions {
    flex-basis: 100%;
    padding-top: 0;
  }

  .custom-actions .btn {
    width: 100%;
  }

  .hud {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    padding: 10px 0;
  }

  .counters {
    justify-content: space-between;
  }

  .counter {
    flex: 1 1 0;
    min-width: 0;
  }

  .hud-controls {
    justify-content: space-between;
    gap: 8px;
  }

  .switch {
    padding-right: 12px;
  }

  .board-scroller {
    min-height: 200px;
    max-height: 74vh;
    max-height: 74svh;
    padding: 6px;
  }

  .board {
    padding: 4px;
  }

  .app-footer {
    padding: 0 12px 20px;
  }
}

@media (max-width: 380px) {
  .brand-text p {
    display: none;
  }

  .layout {
    padding: 6px 4px 16px;
  }

  .game-card {
    padding: 8px 6px;
  }

  .board-scroller {
    padding: 4px;
  }

  .board {
    padding: 3px;
  }

  .segment {
    padding: 0 9px;
  }

  .segment .icon {
    display: none;
  }

  .zoom-fit {
    min-width: 38px;
    padding: 0 6px;
  }
}

@media (pointer: coarse) {
  .segment {
    min-height: 42px;
  }

  .icon-btn,
  .zoom-fit {
    width: 44px;
    height: 44px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .spinner,
  .badge[data-tone="busy"]::before {
    animation-duration: 1.6s !important;
    animation-iteration-count: infinite !important;
  }
}

@media (forced-colors: active) {
  .cell.is-hidden {
    border: 2px solid ButtonText;
  }

  .cell.is-revealed {
    border: 1px solid GrayText;
  }

  .cell.is-proven-safe,
  .cell.is-proven-mine {
    border: 3px double ButtonText;
  }

  .cell.is-advised::before,
  .legend-cell.is-advised::before {
    border-color: Highlight;
  }

  .cell:focus-visible::after {
    border-color: Highlight;
  }

  .switch-track,
  .heat-swatch {
    border: 1px solid ButtonText;
  }
}