: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;
  --grid: rgba(144, 181, 147, 0.14);
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  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,
input {
  font: inherit;
}

.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);
}

.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;
}

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

.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);
}

.boost-active {
  border-color: rgba(255, 68, 170, 0.45);
  background: rgba(255, 68, 170, 0.07);
}

.boost-active .stat-value {
  color: #ff44aa;
}

.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-frame {
  position: relative;
  min-height: 200px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 18px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  background:
    linear-gradient(180deg, rgba(10, 16, 14, 0.92), rgba(8, 12, 10, 0.98)),
    var(--board);
  overflow: hidden;
  touch-action: none;
}

@keyframes boardFlash {
  0%   { box-shadow: 0 0 0 3px rgba(255, 215, 0, 0.85), 0 20px 40px rgba(0, 0, 0, 0.24); }
  100% { box-shadow: 0 0 0 3px rgba(255, 215, 0, 0),    0 20px 40px rgba(0, 0, 0, 0.24); }
}

.board-frame.new-best {
  animation: boardFlash 0.9s ease-out forwards;
}

/* D-pad — hidden on desktop, visible on touch devices */
.dpad {
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 14px 0 4px;
}

.dpad-middle {
  display: flex;
  align-items: center;
  gap: 6px;
}

.dpad-center {
  width: 58px;
  height: 58px;
}

.dpad-btn {
  width: 58px;
  height: 58px;
  min-height: unset;
  padding: 0;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

.dpad-btn:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.1);
  transform: none;
  filter: none;
}

.dpad-btn:active {
  background: rgba(116, 214, 128, 0.18);
  border-color: rgba(116, 214, 128, 0.35);
}

@media (hover: none) and (pointer: coarse) {
  .dpad {
    display: flex;
  }

  .play-area {
    grid-template-rows: auto auto minmax(0, 1fr) auto;
  }
}

canvas {
  display: block;
  border-radius: 16px;
  background: var(--board);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.04);
}

.board-overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  align-content: center;
  gap: 8px;
  padding: 24px;
  text-align: center;
  background: rgba(3, 7, 6, 0.64);
}

.board-overlay h2 {
  font-size: clamp(1.8rem, 3vw, 2.6rem);
}

.board-overlay p {
  margin: 0;
  max-width: 28rem;
  color: var(--muted);
}

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

.controls-panel,
.leaderboard {
  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;
  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 {
  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: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);
  border-color: rgba(255, 255, 255, 0.08);
  color: var(--text);
}

.help {
  margin: 14px 0 0;
  color: var(--muted);
  line-height: 1.5;
}

.advanced-options {
  margin-top: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toggle-label {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--muted);
  cursor: pointer;
  user-select: none;
}

.toggle-label input[type="checkbox"] {
  width: 36px;
  height: 20px;
  appearance: none;
  -webkit-appearance: none;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 999px;
  position: relative;
  cursor: pointer;
  transition: background 160ms ease;
  flex-shrink: 0;
}

.toggle-label input[type="checkbox"]::after {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  background: var(--muted);
  border-radius: 50%;
  top: 2px;
  left: 2px;
  transition: transform 160ms ease, background 160ms ease;
}

.toggle-label input[type="checkbox"]:checked {
  background: var(--accent-strong);
  border-color: var(--accent);
}

.toggle-label input[type="checkbox"]:checked::after {
  transform: translateX(16px);
  background: var(--accent);
}

.gem-help {
  margin-top: 14px;
}

.gem-help-intro {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.5;
}

.gem-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 6px;
}

.gem-legend li {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 0.82rem;
  color: var(--muted);
}

.gem-pip {
  width: 10px;
  height: 10px;
  min-width: 10px;
  background: var(--gem-color);
  box-shadow: 0 0 6px var(--gem-color);
  transform: rotate(45deg);
  border-radius: 2px;
}

.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;
}

.leaderboard table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.leaderboard th,
.leaderboard td {
  padding: 10px 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
  text-align: left;
}

.leaderboard th {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.leaderboard td:last-child,
.leaderboard th:last-child {
  text-align: right;
}

.leaderboard tbody tr:last-child td {
  border-bottom: none;
}

.leaderboard .empty {
  text-align: center;
  color: var(--muted);
}

.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-overlay.hidden,
.board-overlay.hidden,
.advanced-options.hidden,
#boost-card.hidden {
  display: none;
}

.modal {
  width: min(92vw, 380px);
  padding: 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 {
  margin: 10px 0 18px;
  color: var(--muted);
}

.modal-field {
  display: grid;
  gap: 8px;
}

.modal-label {
  text-align: left;
  font-size: 0.85rem;
  color: var(--muted);
}

.modal input {
  width: 100%;
  min-height: 46px;
  padding: 0 14px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
}

.modal input::placeholder {
  color: rgba(237, 244, 238, 0.4);
}

.error {
  min-height: 1em;
  color: var(--danger);
  font-size: 0.9rem;
}

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

@media (max-width: 980px) {
  .app {
    grid-template-columns: 1fr;
  }

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

  .board-frame {
    min-height: 300px;
  }

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

@media (max-width: 720px) {
  .app {
    padding: 14px;
    gap: 14px;
  }

  .play-area {
    min-height: auto;
    padding: 16px;
  }

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

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

  .board-frame {
    min-height: 240px;
  }

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

  .leaderboard-header {
    flex-direction: column;
    align-items: start;
  }

  .controls {
    flex-direction: column;
  }

  button,
  .secondary-btn {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .board-frame.new-best {
    animation: none;
  }

  * {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}