/* Layout */
.game-layout {
  max-width: 700px;
  margin: 0 auto;
  padding: 1rem;
  font-family:
    system-ui,
    -apple-system,
    sans-serif;
}

.game-top-bar {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 6px;
  text-decoration: none;
  font-size: 1.25rem;
  color: #4a5568;
  background: #edf2f7;
}

.icon-btn:hover {
  background: #e2e8f0;
}

.level-title {
  font-weight: 700;
  font-size: 1.2rem;
}

.step-display {
  margin-left: auto;
  font-variant-numeric: tabular-nums;
  color: #718096;
}

/* Level nav */
.level-nav {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.level-btn {
  padding: 0.3rem 0.75rem;
  border: 2px solid #cbd5e0;
  border-radius: 6px;
  background: none;
  cursor: pointer;
  font-size: 0.9rem;
  color: #4a5568;
  transition:
    border-color 0.15s,
    background 0.15s;
}

.level-btn:hover {
  border-color: #a0aec0;
  background: #f7fafc;
}

.level-btn.active {
  border-color: #3182ce;
  background: #ebf8ff;
  color: #2b6cb0;
  font-weight: 600;
}

.level-btn.completed {
  border-color: #48bb78;
}

.level-btn.completed::after {
  content: " \2713";
  color: #48bb78;
}

.level-description {
  color: #4a5568;
  margin: 0 0 1.25rem;
  line-height: 1.5;
}

/* Tape */
.tape-section {
  margin-bottom: 0.75rem;
  position: relative;
}

.tape-label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #a0aec0;
  margin-bottom: 0.25rem;
}

.tape {
  display: flex;
  gap: 2px;
}

.tape-cell {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  border: 2px solid #cbd5e0;
  border-radius: 6px;
  font-size: 1.4rem;
  font-weight: 600;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  background: #fff;
  transition:
    background 0.15s,
    border-color 0.15s,
    transform 0.15s;
}

.tape-target .tape-cell {
  opacity: 0.5;
  border-style: dashed;
  height: 2.25rem;
  font-size: 1.1rem;
}

.tape-cell.head {
  border-color: #3182ce;
  background: #ebf8ff;
  transform: scale(1.08);
  box-shadow: 0 0 0 2px rgb(49, 130, 206, 0.25);
}

.tape-cell.match {
  border-color: #48bb78;
  background: #f0fff4;
}

.tape-cell.mismatch {
  border-color: #e53e3e;
  background: #fff5f5;
}

.head-indicator {
  position: absolute;
  bottom: -0.6rem;
  width: 0;
  height: 0;
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-bottom: 8px solid #3182ce;
  transition: left 0.2s ease;
  transform: rotate(180deg);
}

/* Status line */
.controls-bar {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 0.75rem 0;
  flex-wrap: wrap;
}

.status-line {
  font-size: 0.95rem;
  color: #4a5568;
  white-space: nowrap;
}

/* Controls */
.controls {
  display: flex;
  gap: 0.5rem;
}

.ctrl-btn {
  padding: 0.5rem 1.25rem;
  border: 2px solid #cbd5e0;
  border-radius: 6px;
  background: #fff;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 500;
  color: #4a5568;
  transition:
    border-color 0.15s,
    background 0.15s;
}

.ctrl-btn:hover {
  border-color: #a0aec0;
  background: #f7fafc;
}

.ctrl-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.ctrl-btn kbd {
  font-size: 0.7rem;
  padding: 0.1rem 0.3rem;
  margin-left: 0.25rem;
  opacity: 0.6;
}

.btn-icon {
  margin-right: 0.15rem;
}

/* Section headings */
.section-group {
  margin-bottom: 0.75rem;
}

.section-heading {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #718096;
  margin: 0 0 0.35rem;
}

/* Result message */
.result-msg {
  padding: 0.75rem 1rem;
  border-radius: 6px;
  font-weight: 600;
  margin-bottom: 1rem;
}

.result-msg.success {
  background: #f0fff4;
  color: #276749;
  border: 1px solid #c6f6d5;
}

.result-msg.error {
  background: #fff5f5;
  color: #9b2c2c;
  border: 1px solid #fed7d7;
}

.hidden {
  display: none !important;
}

/* Rule table */
.rule-section {
  margin-top: 1.5rem;
}

.rule-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.rule-header h2 {
  font-size: 1.1rem;
  margin: 0;
}

.small-btn {
  padding: 0.25rem 0.75rem;
  border: 1px solid #cbd5e0;
  border-radius: 4px;
  background: #fff;
  cursor: pointer;
  font-size: 0.85rem;
  color: #4a5568;
}

.small-btn:hover {
  background: #f7fafc;
  border-color: #a0aec0;
}

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

.rule-table th {
  text-align: left;
  padding: 0.4rem 0.5rem;
  border-bottom: 2px solid #e2e8f0;
  font-size: 0.85rem;
  font-weight: 600;
  color: #718096;
}

.rule-table td {
  padding: 0.3rem 0.25rem;
  border-bottom: 1px solid #edf2f7;
}

.rule-table select {
  width: 100%;
  padding: 0.35rem 0.3rem;
  border: 1px solid #cbd5e0;
  border-radius: 4px;
  font-size: 0.9rem;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  background: #fff;
}

.rule-table select:focus {
  outline: 2px solid #3182ce;
  outline-offset: 1px;
}

.rule-table .active-rule {
  background: #ebf8ff;
}

.delete-rule-btn {
  border: none;
  background: none;
  cursor: pointer;
  color: #a0aec0;
  font-size: 1.1rem;
  padding: 0.25rem;
  border-radius: 4px;
}

.delete-rule-btn:hover {
  color: #e53e3e;
  background: #fff5f5;
}

/* Info sections */
.info-section {
  margin-top: 1rem;
  border: 1px solid #e2e8f0;
  border-radius: 6px;
  padding: 0.75rem 1rem;
}

.info-section h2 {
  font-size: 1rem;
  font-weight: 600;
  color: #4a5568;
  margin: 0 0 0.5rem;
}

.info-section ul {
  margin: 0.5rem 0;
  padding-left: 1.25rem;
}

.info-section li {
  margin-bottom: 0.3rem;
  line-height: 1.4;
}

.shortcuts-list {
  list-style: none;
  padding-left: 0;
}

.shortcuts-list li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

kbd {
  display: inline-block;
  min-width: 2rem;
  padding: 0.15rem 0.4rem;
  border: 1px solid #cbd5e0;
  border-radius: 3px;
  background: #edf2f7;
  font-family: inherit;
  font-size: 0.85rem;
  text-align: center;
}

/* Dark mode */
@media (prefers-color-scheme: dark) {
  .icon-btn {
    color: #cbd5e0;
    background: #2d3748;
  }

  .icon-btn:hover {
    background: #4a5568;
  }

  .level-title {
    color: #e2e8f0;
  }

  .step-display {
    color: #a0aec0;
  }

  .level-btn {
    border-color: #4a5568;
    color: #cbd5e0;
  }

  .level-btn:hover {
    border-color: #718096;
    background: #2d3748;
  }

  .level-btn.active {
    border-color: #63b3ed;
    background: #2a4365;
    color: #bee3f8;
  }

  .level-description {
    color: #a0aec0;
  }

  .tape-label {
    color: #718096;
  }

  .tape-cell {
    background: #2d3748;
    border-color: #4a5568;
    color: #e2e8f0;
  }

  .tape-cell.head {
    border-color: #63b3ed;
    background: #2a4365;
    box-shadow: 0 0 0 2px rgb(99, 179, 237, 0.25);
  }

  .tape-cell.match {
    border-color: #48bb78;
    background: #1c4532;
  }

  .tape-cell.mismatch {
    border-color: #fc8181;
    background: #4a2020;
  }

  .head-indicator {
    border-bottom-color: #63b3ed;
  }

  .status-line {
    color: #a0aec0;
  }

  .ctrl-btn {
    background: #2d3748;
    border-color: #4a5568;
    color: #cbd5e0;
  }

  .ctrl-btn:hover {
    background: #4a5568;
    border-color: #718096;
  }

  .result-msg.success {
    background: #1c4532;
    color: #9ae6b4;
    border-color: #276749;
  }

  .result-msg.error {
    background: #4a2020;
    color: #feb2b2;
    border-color: #9b2c2c;
  }

  .rule-header h2 {
    color: #e2e8f0;
  }

  .small-btn {
    background: #2d3748;
    border-color: #4a5568;
    color: #cbd5e0;
  }

  .small-btn:hover {
    background: #4a5568;
  }

  .rule-table th {
    border-bottom-color: #4a5568;
    color: #a0aec0;
  }

  .rule-table td {
    border-bottom-color: #2d3748;
  }

  .rule-table select {
    background: #2d3748;
    border-color: #4a5568;
    color: #e2e8f0;
  }

  .rule-table select:focus {
    outline-color: #63b3ed;
  }

  .rule-table .active-rule {
    background: #2a4365;
  }

  .delete-rule-btn {
    color: #718096;
  }

  .delete-rule-btn:hover {
    color: #fc8181;
    background: #4a2020;
  }

  .info-section {
    border-color: #4a5568;
  }

  .info-section h2 {
    color: #cbd5e0;
  }

  .info-section li {
    color: #a0aec0;
  }

  .section-heading {
    color: #a0aec0;
  }

  kbd {
    background: #2d3748;
    border-color: #4a5568;
    color: #cbd5e0;
  }
}