:root {
  --bg: #e8e3d8;
  --panel: rgba(252, 250, 246, 0.92);
  --panel-soft: #f3efe6;
  --ink: #1f1c18;
  --muted: #69635d;
  --line: rgba(50, 44, 38, 0.14);
  --shadow: 0 22px 55px rgba(50, 39, 28, 0.12);
  --accent: #c96a3d;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top left, rgba(255, 255, 255, 0.52), transparent 24%),
    linear-gradient(180deg, #f2ede4 0%, #e4dccf 100%);
  color: var(--ink);
  font-family: "Segoe UI", "Aptos", "Trebuchet MS", sans-serif;
}

h1,
h2,
p {
  margin: 0;
}

h1,
h2 {
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 600;
}

button,
a {
  font: inherit;
}

.app {
  width: min(1360px, calc(100% - 36px));
  margin: 0 auto;
  padding: 28px 0 34px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 24px;
  margin-bottom: 22px;
}

.eyebrow,
.section-label,
.hud-label {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.76rem;
  font-weight: 700;
  color: var(--muted);
}

.title-row {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 10px;
}

.intro,
.detail-copy {
  color: var(--muted);
  line-height: 1.7;
}

.intro {
  max-width: 760px;
  margin-top: 12px;
}

.header-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.button,
.button-secondary,
.mode-button {
  border-radius: 999px;
  padding: 13px 18px;
  border: 1px solid var(--line);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  transition: transform 140ms ease, border-color 140ms ease, background 140ms ease, color 140ms ease;
}

.button {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 10px 24px rgba(201, 106, 61, 0.18);
}

.button-secondary {
  background: rgba(255, 255, 255, 0.72);
  color: var(--ink);
}

.button:hover,
.button-secondary:hover,
.mode-button:hover {
  transform: translateY(-1px);
}

.status-pill {
  display: inline-flex;
  align-items: center;
  padding: 7px 11px;
  border-radius: 999px;
  border: 1px solid rgba(50, 44, 38, 0.1);
  background: rgba(255, 255, 255, 0.6);
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(320px, 0.72fr);
  gap: 22px;
}

.card {
  border-radius: 26px;
  border: 1px solid rgba(50, 44, 38, 0.08);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.workspace-card,
.side-panel {
  padding: 22px;
}

.panel-heading {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 18px;
  margin-bottom: 16px;
}

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

.mode-button {
  padding: 10px 14px;
  background: rgba(255, 255, 255, 0.62);
  color: var(--muted);
}

.mode-button.active {
  background: var(--accent);
  color: #fff;
  border-color: rgba(201, 106, 61, 0.26);
}

.game-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  gap: 18px;
}

.board-stage {
  display: grid;
  gap: 14px;
}

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

.hud-chip,
.glass-panel,
.detail-card {
  border: 1px solid rgba(50, 44, 38, 0.08);
  background: rgba(255, 255, 255, 0.58);
  box-shadow: 0 16px 32px rgba(50, 39, 28, 0.08);
}

.hud-chip {
  min-width: 108px;
  border-radius: 18px;
  padding: 12px 14px;
  display: grid;
  gap: 4px;
}

.hud-chip strong {
  font-size: 1.28rem;
  font-family: Georgia, "Times New Roman", serif;
}

.board-wrap {
  position: relative;
  min-height: 720px;
  border-radius: 24px;
  border: 1px solid rgba(62, 54, 47, 0.12);
  overflow: hidden;
  background:
    linear-gradient(180deg, rgba(252, 250, 246, 0.7), rgba(224, 216, 204, 0.88)),
    radial-gradient(circle at top center, rgba(255, 255, 255, 0.5), transparent 38%);
}

.game-board {
  position: relative;
  z-index: 2;
  width: min(100%, 480px);
  aspect-ratio: 10 / 18;
  margin: 22px auto;
  border-radius: 22px;
  overflow: hidden;
  display: grid;
  grid-template-columns: repeat(10, minmax(0, 1fr));
  gap: 2px;
  padding: 12px;
  background:
    linear-gradient(180deg, rgba(29, 27, 24, 0.08), rgba(255, 255, 255, 0.12)),
    rgba(85, 76, 66, 0.12);
  box-shadow:
    inset 0 0 0 1px rgba(255, 255, 255, 0.2),
    0 24px 45px rgba(50, 39, 28, 0.14);
}

.board-cell {
  position: relative;
  border-radius: 9px;
  background: rgba(255, 255, 255, 0.22);
  border: 1px solid rgba(60, 54, 49, 0.08);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.32);
}

.board-cell.filled::before,
.board-cell.ghost::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
}

.board-cell.filled {
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.28),
    0 6px 14px rgba(28, 24, 20, 0.14);
}

.board-cell.filled::before {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.18), rgba(0, 0, 0, 0.08));
}

.board-cell.ghost {
  background: rgba(255, 255, 255, 0.1);
  border-style: dashed;
}

.board-cell.ghost::before {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(0, 0, 0, 0.02));
}

.cell-value {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-size: 0.68rem;
  font-weight: 700;
}

.board-vignette {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 3;
  background:
    radial-gradient(circle at center, transparent 36%, rgba(16, 14, 11, 0.12) 68%, rgba(12, 10, 8, 0.22) 100%);
}

.feedback-float {
  position: absolute;
  left: 50%;
  top: 18%;
  transform: translate(-50%, -50%);
  z-index: 4;
  padding: 12px 18px;
  border-radius: 999px;
  color: #fff;
  background: linear-gradient(135deg, #5f746f, #7d938b);
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  box-shadow: 0 18px 32px rgba(25, 21, 17, 0.18);
}

.feedback-float.is-visible {
  animation: feedbackPop 900ms ease;
}

.pause-overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  z-index: 5;
  background: rgba(26, 22, 18, 0.2);
  backdrop-filter: blur(4px);
}

.pause-panel {
  max-width: 320px;
  border-radius: 22px;
  padding: 20px;
  background: rgba(252, 250, 246, 0.82);
  border: 1px solid rgba(50, 44, 38, 0.08);
  box-shadow: 0 22px 38px rgba(50, 39, 28, 0.14);
  display: grid;
  gap: 8px;
}

.pause-title {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.12rem;
}

.timer-panel {
  display: grid;
  gap: 10px;
}

.timer-copy {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.timer-copy strong {
  font-size: 1.2rem;
  font-family: Georgia, "Times New Roman", serif;
}

.timer-meter {
  height: 12px;
  border-radius: 999px;
  overflow: hidden;
  border: 1px solid rgba(50, 44, 38, 0.08);
  background: rgba(81, 72, 61, 0.08);
}

.timer-meter-fill {
  width: 100%;
  height: 100%;
  transform-origin: left center;
  background: linear-gradient(90deg, #c96a3d, #d8a16c);
  box-shadow: 0 8px 18px rgba(201, 106, 61, 0.22);
  transition: transform 90ms linear;
}

.control-rail {
  display: grid;
  gap: 14px;
  align-content: start;
}

.glass-panel,
.detail-card {
  border-radius: 20px;
  padding: 16px;
  display: grid;
  gap: 10px;
}

.next-piece {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 6px;
}

.next-cell {
  aspect-ratio: 1;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.24);
  border: 1px solid rgba(60, 54, 49, 0.08);
}

.controls-grid {
  display: grid;
  gap: 8px;
  color: var(--muted);
  line-height: 1.6;
}

.feedback-log {
  display: grid;
  gap: 10px;
}

.feedback-log-item {
  padding: 12px 14px;
  border-radius: 16px;
  border: 1px solid rgba(50, 44, 38, 0.08);
  background: rgba(255, 255, 255, 0.52);
  display: grid;
  gap: 4px;
}

.feedback-label {
  font-weight: 700;
}

.feedback-meta {
  color: var(--muted);
  font-size: 0.92rem;
}

.feedback-log-empty {
  color: var(--muted);
}

.hidden {
  display: none !important;
}

@keyframes feedbackPop {
  0% {
    opacity: 0;
    transform: translate(-50%, -34%) scale(0.84);
  }

  18% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1.04);
  }

  100% {
    opacity: 0;
    transform: translate(-50%, -64%) scale(0.98);
  }
}

@media (max-width: 1120px) {
  .layout,
  .topbar,
  .game-shell {
    display: grid;
    grid-template-columns: 1fr;
  }

  .header-actions {
    justify-content: flex-start;
  }
}

@media (max-width: 720px) {
  .app {
    width: min(100% - 24px, 1360px);
    padding-top: 22px;
  }

  .workspace-card,
  .side-panel {
    padding: 18px;
  }

  .board-wrap {
    min-height: 560px;
  }

  .game-board {
    margin: 16px;
    width: calc(100% - 32px);
  }
}