:root {
  color-scheme: dark;
  font-family: "Trebuchet MS", "Gill Sans", sans-serif;

  --bg: #0c1311;
  --bg-accent: #12201b;
  --panel: rgba(18, 30, 26, 0.92);
  --panel-border: rgba(142, 179, 144, 0.22);
  --text: #edf4ee;
  --muted: #9eb4a1;
  --accent: #74d680;
  --accent-strong: #2d8f47;
  --danger: #ff7878;
  --board: #09110e;
  --gold: #e9c56a;
  --card: #f5f0df;
  --card-ink: #17201a;
  --card-red: #bc3941;
  --card-shadow: rgba(0, 0, 0, 0.34);
  --pile-gap: clamp(10px, 1vw, 22px);
  --card-w: clamp(100px, 7.8vw, 160px);
  --card-h: calc(var(--card-w) * 1.38);
  --stack-gap: clamp(32px, 1.8vw, 38px);
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  min-height: 100%;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at top left, rgba(116, 214, 128, 0.14), transparent 28%),
    radial-gradient(circle at bottom right, rgba(73, 134, 96, 0.18), transparent 34%),
    linear-gradient(180deg, var(--bg-accent), var(--bg));
  color: var(--text);
}

button {
  font: inherit;
}

.app {
  width: 100vw;
  min-height: 100vh;
  padding: 24px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 340px);
  gap: 20px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 18px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.24);
  backdrop-filter: blur(10px);
}

.hidden {
  display: none !important;
}

.back-link {
  display: inline-block;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  margin-bottom: 6px;
  transition: color 120ms ease;
}

.back-link:hover {
  color: var(--accent);
}

.play-area {
  min-height: calc(100vh - 48px);
  padding: 20px;
  display: grid;
  grid-template-rows: auto auto minmax(0, 1fr) auto;
  gap: 18px;
}

.play-header {
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: 12px;
}

.eyebrow {
  margin: 0 0 4px;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.72rem;
  color: var(--muted);
}

h1,
h2 {
  margin: 0;
}

h1 {
  font-size: clamp(2rem, 3vw, 2.8rem);
  line-height: 1;
}

h2 {
  font-size: 1.1rem;
}

.stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.stat-card {
  padding: 12px 14px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.04);
  display: grid;
  gap: 6px;
}

.status-card {
  border-color: rgba(116, 214, 128, 0.18);
}

.stat-label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.stat-value {
  font-size: clamp(1rem, 2vw, 1.4rem);
  font-weight: 700;
}

.board {
  min-height: 560px;
  padding: clamp(12px, 2vw, 22px);
  border-radius: 18px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  background:
    radial-gradient(circle at 50% 0, rgba(116, 214, 128, 0.09), transparent 34%),
    linear-gradient(180deg, rgba(10, 16, 14, 0.92), rgba(8, 12, 10, 0.98)),
    var(--board);
  overflow-x: auto;
  overflow-y: hidden;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.03);
}

.top-row,
.tableau {
  display: grid;
  grid-template-columns: repeat(7, var(--card-w));
  justify-content: space-between;
  gap: 0;
  justify-items: center;
  width: min(100%, clamp(980px, 66vw, 1320px));
  min-width: 0;
  margin-inline: auto;
}

.top-row {
  align-items: start;
  margin-bottom: clamp(18px, 3vw, 34px);
}

.foundation-row {
  grid-column: 4 / span 4;
  display: grid;
  grid-template-columns: repeat(4, var(--card-w));
  justify-content: space-between;
  gap: 0;
  justify-items: center;
  width: 100%;
}

.tableau {
  align-items: start;
}

.pile-host,
.tableau-pile {
  position: relative;
  width: var(--card-w);
  min-height: var(--card-h);
}

.pile-host[data-count="2"]::before,
.pile-host[data-count="3"]::before,
.pile-host[data-count="3"]::after {
  content: "";
  position: absolute;
  inset: 0;
  width: var(--card-w);
  height: var(--card-h);
  border-radius: clamp(8px, 1vw, 13px);
  background: rgba(245, 240, 223, 0.42);
  border: 1px solid rgba(255, 255, 255, 0.18);
}

.pile-host[data-count="2"]::before,
.pile-host[data-count="3"]::before {
  transform: translateX(-5px);
}

.pile-host[data-count="3"]::after {
  transform: translateX(-10px);
}

.pile-host .waste-card {
  position: relative;
  z-index: 2;
}

.card,
.pile-slot {
  width: var(--card-w);
  height: var(--card-h);
  min-height: unset;
  padding: 0;
  border-radius: clamp(8px, 1vw, 13px);
  font: inherit;
  cursor: pointer;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.card {
  position: relative;
  display: block;
  border: 1px solid rgba(255, 255, 255, 0.5);
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.76), rgba(255, 255, 255, 0)),
    var(--card);
  color: var(--card-ink);
  box-shadow: 0 8px 18px var(--card-shadow);
  transition: transform 120ms ease, box-shadow 120ms ease, filter 120ms ease;
}

.card:hover,
.card:focus-visible {
  transform: translateY(-2px);
  filter: brightness(1.02);
  outline: none;
}

.card.selected {
  transform: translateY(-6px);
  box-shadow:
    0 13px 26px rgba(0, 0, 0, 0.42),
    0 0 0 3px rgba(116, 214, 128, 0.62);
}

.card.red {
  color: var(--card-red);
}

.card.face-down {
  display: grid;
  place-items: center;
  color: rgba(237, 244, 238, 0.76);
  border-color: rgba(116, 214, 128, 0.38);
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.06), transparent 28%),
    repeating-linear-gradient(45deg, rgba(116, 214, 128, 0.16) 0 7px, rgba(116, 214, 128, 0.05) 7px 14px),
    linear-gradient(180deg, #183026, #0d1814);
}

.card-back-mark {
  width: 42%;
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid rgba(116, 214, 128, 0.42);
  color: var(--accent);
  font-weight: 800;
  letter-spacing: 0.04em;
}

.card-corner {
  position: absolute;
  display: grid;
  gap: 1px;
  justify-items: center;
  font-size: clamp(0.7rem, 1vw, 0.95rem);
  line-height: 0.95;
  font-weight: 800;
}

.card-corner-top {
  top: 7%;
  left: 9%;
}

.card-corner-bottom {
  right: 9%;
  bottom: 7%;
  transform: rotate(180deg);
}

.card-suit {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-size: clamp(1.8rem, 2.8vw, 3.1rem);
  line-height: 1;
}

.tableau-card + .tableau-card {
  margin-top: calc(var(--stack-gap) - var(--card-h));
}

.pile-slot {
  display: grid;
  place-items: center;
  align-content: center;
  gap: 4px;
  border: 1px dashed rgba(142, 179, 144, 0.32);
  background: rgba(255, 255, 255, 0.035);
  color: var(--muted);
  transition: border-color 140ms ease, background 140ms ease, color 140ms ease, transform 120ms ease;
}

.pile-slot:hover,
.pile-slot:focus-visible {
  transform: translateY(-1px);
  border-color: rgba(116, 214, 128, 0.58);
  background: rgba(116, 214, 128, 0.08);
  color: var(--text);
  outline: none;
}

.pile-label {
  font-size: clamp(1rem, 2.2vw, 1.6rem);
  font-weight: 800;
  line-height: 1;
}

.pile-detail {
  color: var(--muted);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.red-suit {
  color: var(--card-red);
}

.black-suit {
  color: var(--text);
}

.board-message {
  min-height: 1.4em;
  margin: 0;
  color: var(--muted);
  line-height: 1.45;
}

.sidebar {
  display: grid;
  gap: 20px;
  align-content: start;
}

.controls-panel,
.progress-panel,
.rules-panel {
  padding: 18px;
}

.mode-toggle {
  display: flex;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: 999px;
  padding: 4px;
  gap: 3px;
  margin-bottom: 14px;
}

.mode-toggle-btn {
  flex: 1;
  min-height: 34px;
  padding: 6px 10px;
  border-radius: 999px;
  border: none;
  background: transparent;
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 160ms ease, color 160ms ease;
}

.mode-toggle-btn:hover:not(.active) {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  transform: none;
  filter: none;
}

.mode-toggle-btn.active {
  background: linear-gradient(180deg, var(--accent), var(--accent-strong));
  color: #08100d;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

button:not(.card):not(.pile-slot):not(.mode-toggle-btn) {
  min-height: 42px;
  padding: 10px 16px;
  border-radius: 999px;
  border: 1px solid transparent;
  background: linear-gradient(180deg, var(--accent), var(--accent-strong));
  color: #08100d;
  font-weight: 700;
  cursor: pointer;
  transition: transform 120ms ease, opacity 120ms ease, filter 120ms ease;
}

button:not(.card):not(.pile-slot):not(.mode-toggle-btn):hover:not(:disabled) {
  transform: translateY(-1px);
  filter: brightness(1.03);
}

button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.secondary-btn {
  background: rgba(255, 255, 255, 0.04) !important;
  border-color: rgba(255, 255, 255, 0.08) !important;
  color: var(--text) !important;
}

.help {
  margin: 14px 0 0;
  color: var(--muted);
  line-height: 1.6;
  font-size: 0.88rem;
}

.help kbd {
  font-family: inherit;
  font-size: 0.82em;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 5px;
  padding: 1px 5px;
}

.leaderboard-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 12px;
}

.leaderboard-note {
  color: var(--muted);
  font-size: 0.82rem;
}

.foundation-status {
  display: grid;
  gap: 8px;
}

.foundation-chip {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  padding: 9px 10px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.035);
  border: 1px solid rgba(255, 255, 255, 0.045);
  color: var(--muted);
}

.foundation-chip span:first-child {
  font-size: 1.2rem;
  text-align: center;
}

.suit-red {
  color: var(--card-red);
}

.suit-black {
  color: var(--text);
}

.foundation-count {
  color: var(--accent);
  font-weight: 700;
}

.rules-list {
  margin: 12px 0 0;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.55;
  font-size: 0.9rem;
}

.rules-list li + li {
  margin-top: 8px;
}

.modal-overlay {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(5, 8, 7, 0.74);
  z-index: 10;
}

.modal {
  width: min(92vw, 400px);
  padding: 28px 24px;
  border-radius: 20px;
  background: linear-gradient(180deg, #15231d, #0f1814);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 28px 60px rgba(0, 0, 0, 0.35);
  text-align: center;
}

.modal p:not(.eyebrow) {
  margin: 10px 0 18px;
  color: var(--muted);
}

.modal-actions {
  margin-top: 14px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}

@media (max-width: 1060px) {
  :root {
    --card-w: clamp(72px, 7.5vw, 96px);
    --stack-gap: clamp(30px, 3vw, 42px);
  }

  .app {
    grid-template-columns: 1fr;
  }

  .play-area {
    min-height: auto;
  }

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

@media (max-width: 760px) {
  .app {
    padding: 14px;
    gap: 14px;
  }

  .play-area {
    padding: 16px;
  }

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

  .stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .board {
    min-height: 510px;
  }

  .sidebar {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .controls {
    flex-direction: column;
  }

  button:not(.card):not(.pile-slot):not(.mode-toggle-btn),
  .secondary-btn {
    width: 100%;
  }
}

@media (max-width: 420px) {
  :root {
    --card-w: clamp(32px, calc((100vw - 114px) / 7), 39px);
    --pile-gap: 5px;
    --stack-gap: 24px;
  }

  .board {
    padding: 10px;
  }

  .pile-label {
    font-size: 0.75rem;
  }

  .pile-detail {
    font-size: 0.58rem;
  }
}

@media (max-width: 340px) {
  .app {
    padding: 10px;
  }

  .play-area {
    padding: 12px;
  }

  .board {
    padding: 8px;
  }
}

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