@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@400;500;600&family=Syne:wght@600;700;800&display=swap');

:root {
  --bg-color: #0f0f13;
  --surface-color: #1c1c21;
  --surface-hover: #2a2a31;
  --text-primary: #ededed;
  --text-secondary: #a0a0aa;
  --accent-color: #0ea5e9;
  /* Electric teal */
  --accent-hover: #0284c7;
  --error-color: #ef4444;
  --success-color: #10b981;
  --border-radius: 12px;

  --font-display: 'Syne', sans-serif;
  --font-body: 'Outfit', sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-color);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

h1,
h2,
h3 {
  font-family: var(--font-display);
}

a {
  color: var(--accent-color);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* Utilities */
.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem;
  width: 100%;
}

.text-center {
  text-align: center;
}

.mb-1 {
  margin-bottom: 0.5rem;
}

.mb-2 {
  margin-bottom: 1rem;
}

.mb-4 {
  margin-bottom: 2rem;
}

.mt-4 {
  margin-top: 2rem;
}

/* Buttons */
.btn {
  display: inline-block;
  background-color: var(--surface-color);
  color: var(--text-primary);
  border: 1px solid #333;
  padding: 0.75rem 1.5rem;
  border-radius: var(--border-radius);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn:hover {
  background-color: var(--surface-hover);
}

.btn-primary {
  background-color: var(--accent-color);
  color: #fff;
  border: none;
}

.btn-primary:hover {
  background-color: var(--accent-hover);
}

/* Header */
header {
  padding: 2rem 0;
  text-align: center;
}

header h1 {
  font-size: 3rem;
  letter-spacing: -0.05em;
  margin-bottom: 0.5rem;
  background: linear-gradient(135deg, #fff, #999);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

header p {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

/* Upload UI */
.upload-zone {
  border: 2px dashed #444;
  border-radius: 16px;
  padding: 4rem 2rem;
  text-align: center;
  background-color: rgba(28, 28, 33, 0.5);
  transition: all 0.2s ease;
  cursor: pointer;
}

.upload-zone.dragover {
  border-color: var(--accent-color);
  background-color: rgba(14, 165, 233, 0.1);
}

.upload-zone p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  pointer-events: none;
}

#file-input {
  display: none;
}

.preview-panel {
  display: none;
  background-color: var(--surface-color);
  border-radius: var(--border-radius);
  padding: 1.5rem;
  margin-top: 2rem;
  overflow-x: auto;
}

.preview-table {
  width: 100%;
  border-collapse: collapse;
}

.preview-table th,
.preview-table td {
  padding: 0.5rem 1rem;
  text-align: left;
  border-bottom: 1px solid #333;
  white-space: nowrap;
}

.preview-table th {
  color: var(--text-secondary);
  font-weight: 500;
}

/* Share Link Area */
.share-area {
  display: none;
  background-color: var(--surface-color);
  padding: 2rem;
  border-radius: var(--border-radius);
  text-align: center;
  margin-top: 2rem;
  border: 1px solid #333;
}

.share-link-group {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
  margin: 1.5rem 0;
}

.share-link-group input {
  flex: 1;
  max-width: 400px;
  background-color: #111;
  border: 1px solid #333;
  color: #fff;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  font-family: monospace;
  font-size: 1rem;
}

/* Game Status/Scoreboard */
.scoreboard {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: var(--surface-color);
  padding: 1rem 1.5rem;
  border-radius: var(--border-radius);
  margin-bottom: 2rem;
}

.score-stats {
  display: flex;
  gap: 2rem;
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
}

.stat-value {
  font-size: 1.25rem;
  font-weight: 600;
  font-family: var(--font-display);
}



.progress-container {
  flex: 1;
  max-width: 300px;
  margin: 0 2rem;
}

.progress-bar-bg {
  width: 100%;
  height: 8px;
  background-color: #333;
  border-radius: 4px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background-color: var(--accent-color);
  width: 0%;
  transition: width 0.3s ease;
}

/* Board */
.game-board {
  display: grid;
  gap: 12px;
  margin-bottom: 2rem;
}

.tile {
  background-color: var(--surface-color);
  border: 1px solid #333;
  border-radius: var(--border-radius);
  padding: 1rem 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  cursor: pointer;
  user-select: none;
  font-size: 1.1rem;
  font-weight: 500;
  transition: all 0.15s ease;
  min-height: 80px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  word-break: break-word;
}

.tile:hover {
  transform: translateY(-2px);
  background-color: var(--surface-hover);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.2);
}

.tile.selected {
  background-color: var(--accent-color);
  border-color: var(--accent-hover);
  color: #fff;
  transform: scale(1.02);
  box-shadow: 0 0 15px rgba(14, 165, 233, 0.4);
}

.tile.merged {
  background-color: #272730;
  border-color: #444;
  position: relative;
}

.tile[data-tooltip]:hover::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 110%;
  left: 50%;
  transform: translateX(-50%);
  background-color: #111;
  color: #fff;
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 400;
  font-family: var(--font-body);
  white-space: pre-wrap;
  z-index: 100;
  width: max-content;
  max-width: 250px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
  pointer-events: none;
  border: 1px solid #333;
}

.tile.merged.selected {
  background-color: var(--accent-color);
}

/* Distinct solved colors for categories */
.tile.solved-0 {
  background-color: #f59e0b;
  color: #000;
  border-color: #f59e0b;
  pointer-events: none;
}

.tile.solved-1 {
  background-color: #10b981;
  color: #000;
  border-color: #10b981;
  pointer-events: none;
}

.tile.solved-2 {
  background-color: #6366f1;
  color: #fff;
  border-color: #6366f1;
  pointer-events: none;
}

.tile.solved-3 {
  background-color: #ec4899;
  color: #fff;
  border-color: #ec4899;
  pointer-events: none;
}

.tile.solved-4 {
  background-color: #8b5cf6;
  color: #fff;
  border-color: #8b5cf6;
  pointer-events: none;
}

.tile.solved-5 {
  background-color: #14b8a6;
  color: #000;
  border-color: #14b8a6;
  pointer-events: none;
}

.tile.solved-6 {
  background-color: #f43f5e;
  color: #fff;
  border-color: #f43f5e;
  pointer-events: none;
}

.tile.solved-7 {
  background-color: #3b82f6;
  color: #fff;
  border-color: #3b82f6;
  pointer-events: none;
}

.tile.solved-8 {
  background-color: #84cc16;
  color: #000;
  border-color: #84cc16;
  pointer-events: none;
}

.tile.solved-9 {
  background-color: #d946ef;
  color: #fff;
  border-color: #d946ef;
  pointer-events: none;
}

.tile.solved-default {
  background-color: #64748b;
  color: #fff;
  border-color: #64748b;
  pointer-events: none;
}

.tile.error {
  animation: shake 0.6s cubic-bezier(.36, .07, .19, .97) both;
  border-color: var(--error-color);
}

@keyframes shake {

  10%,
  90% {
    transform: translate3d(-1px, 0, 0);
  }

  20%,
  80% {
    transform: translate3d(2px, 0, 0);
  }

  30%,
  50%,
  70% {
    transform: translate3d(-4px, 0, 0);
  }

  40%,
  60% {
    transform: translate3d(4px, 0, 0);
  }
}

/* Actions */
.game-actions {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 2rem;
  min-height: 45px;
}

#deselect-btn {
  visibility: hidden;
  opacity: 0;
  transition: opacity 0.2s ease;
}

#deselect-btn.visible {
  visibility: visible;
  opacity: 1;
}

/* Win Overlay */
.overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.win-modal {
  background-color: var(--surface-color);
  padding: 3rem;
  border-radius: 16px;
  text-align: center;
  max-width: 400px;
  border: 1px solid #333;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
  transform: translateY(20px);
  transition: transform 0.3s ease;
}

.overlay.active .win-modal {
  transform: translateY(0);
}

.win-modal h2 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  color: var(--accent-color);
}

/* Alerts */
.error-msg {
  color: var(--error-color);
  margin-top: 1rem;
  font-weight: 500;
}