/* Reset and Base */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
  background-color: #f5f5f5;
  color: #222;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Typography */
h1, h2, h3 {
  margin: 0;
  line-height: 1.2;
}

h1 {
  font-size: 1.25rem;
}

h2 {
  font-size: 1rem;
  color: #2d3748;
}

h3 {
  font-size: 0.9375rem;
  color: #4a5568;
  margin-bottom: 0.5rem;
}

/* Header */
header {
  background: linear-gradient(135deg, #1a365d 0%, #2c5282 100%);
  color: white;
  padding: 0.75rem 1rem;
}

.header-content {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  max-width: 700px;
  margin: 0 auto;
  padding: 0 1rem;
}

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

.header-buttons {
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
}

header h1 {
  color: white;
  margin-bottom: 0.125rem;
}

.subtitle {
  margin: 0;
  font-size: 0.75rem;
  opacity: 0.9;
}

.header-buttons {
  display: flex;
  gap: 0.5rem;
}

/* Remove default positioning for mobile - handled by absolute positioning above */

.btn-header {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  padding: 0;
  background-color: white;
  color: #1a365d;
  border: none;
  border-radius: 50%;
  font-size: 0.9375rem;
  cursor: pointer;
  transition: background-color 0.2s, transform 0.1s;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.btn-header:hover {
  background-color: #edf2f7;
  transform: scale(1.05);
}

.btn-header .btn-icon {
  font-size: 1rem;
  line-height: 1;
}

#btn-help .btn-icon {
  font-weight: bold;
  font-size: 1.125rem;
}

#lang-label {
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

/* Main Container */
.container {
  flex: 1;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0.75rem;
  width: 100%;
}

/* Panel Layout */
.panel-wrapper {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.panel {
  background: white;
  border-radius: 6px;
  padding: 0.75rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

/* Form Elements */
.form-group {
  margin-bottom: 0.625rem;
}

.form-group:last-child {
  margin-bottom: 0;
}

.form-group-compact {
  margin-bottom: 0.5rem;
}

.label-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.25rem;
  flex-wrap: wrap;
}

label {
  display: block;
  font-weight: 500;
  font-size: 0.9375rem;
  color: #4a5568;
}

/* Preset Select */
.preset-select-wrapper select {
  padding: 0.375rem 0.625rem;
  border: 1px solid #cbd5e0;
  border-radius: 4px;
  font-size: 0.875rem;
  background-color: #f7fafc;
  cursor: pointer;
  min-width: 160px;
}

.preset-select-wrapper select:hover {
  border-color: #4299e1;
}

.preset-select-wrapper select:focus {
  outline: none;
  border-color: #4299e1;
  box-shadow: 0 0 0 2px rgba(66, 153, 225, 0.2);
}

/* Textarea */
textarea {
  width: 100%;
  padding: 0.625rem;
  border: 1px solid #cbd5e0;
  border-radius: 4px;
  font-family: "Consolas", "Monaco", monospace;
  font-size: 0.9375rem;
  resize: vertical;
  min-height: 80px;
  line-height: 1.5;
}

textarea:focus {
  outline: none;
  border-color: #4299e1;
  box-shadow: 0 0 0 2px rgba(66, 153, 225, 0.2);
}

/* Fieldset */
fieldset {
  border: 1px solid #e2e8f0;
  border-radius: 4px;
  padding: 0.5rem;
  margin: 0;
}

legend {
  font-weight: 600;
  font-size: 0.875rem;
  color: #2d3748;
  padding: 0 0.375rem;
}

/* Checkbox */
.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: normal;
  cursor: pointer;
  padding: 0.25rem 0;
  font-size: 0.875rem;
  min-height: 28px;
}

.checkbox-label input[type="checkbox"] {
  width: 16px;
  height: 16px;
  cursor: pointer;
  flex-shrink: 0;
}

.checkbox-label.disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.checkbox-label.disabled input {
  cursor: not-allowed;
}

/* Options Grid */
.options-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.125rem 0.5rem;
}

/* Direction Grid */
.direction-grid {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 0.25rem;
}

.direction-grid .checkbox-label {
  justify-content: center;
  padding: 0.375rem;
  min-height: 36px;
  background-color: #f7fafc;
  border-radius: 4px;
  transition: background-color 0.15s;
}

.direction-grid .checkbox-label:hover {
  background-color: #edf2f7;
}

.dir-arrow {
  font-size: 1.125rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.625rem 1.25rem;
  font-size: 1rem;
  font-weight: 500;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.2s, transform 0.1s;
  min-height: 40px;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background-color: #3182ce;
  color: white;
}

.btn-primary:hover {
  background-color: #2c5282;
}

.btn-secondary {
  background-color: #e2e8f0;
  color: #4a5568;
}

.btn-secondary:hover {
  background-color: #cbd5e0;
}

.btn-group {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.btn-group .btn {
  flex: 1;
}

/* Message Area */
.message-area {
  margin-bottom: 0.5rem;
}

.message-area:empty {
  display: none;
}

.message {
  padding: 0.625rem 0.875rem;
  border-radius: 4px;
  font-size: 0.9375rem;
}

.message-error {
  background-color: #fed7d7;
  color: #c53030;
  border: 1px solid #fc8181;
}

.message-warning {
  background-color: #fefcbf;
  color: #975a16;
  border: 1px solid #f6e05e;
}

.message-info {
  background-color: #bee3f8;
  color: #2b6cb0;
  border: 1px solid #63b3ed;
}

/* Stats */
.stats {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  padding: 0.625rem 0.875rem;
  background-color: #edf2f7;
  border-radius: 4px;
  font-size: 0.9375rem;
  margin-bottom: 0.75rem;
}

.stats.hidden {
  display: none;
}

/* Grid Container */
.grid-container {
  overflow-x: auto;
  margin-bottom: 0.5rem;
  padding: 0.5rem;
  background-color: #fafafa;
  border-radius: 4px;
}

.grid-container:empty {
  display: none;
}

.grid {
  display: inline-grid;
  gap: 2px;
  font-family: "Consolas", "Monaco", monospace;
  font-size: 1rem;
  line-height: 1;
}

.grid-cell {
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: white;
  border: 1px solid #e2e8f0;
  border-radius: 2px;
  font-weight: 500;
  transition: background-color 0.2s, opacity 0.2s;
}

.grid-cell.block {
  background-color: #f7fafc;
  color: #a0aec0;
  border-color: #edf2f7;
}

.grid-cell.block::after {
  content: "·";
}

/* Highlight Colors */
.hl-0 { background-color: #fed7aa; }
.hl-1 { background-color: #c6f6d5; }
.hl-2 { background-color: #bee3f8; }
.hl-3 { background-color: #e9d8fd; }
.hl-4 { background-color: #fbb6ce; }
.hl-5 { background-color: #faf089; }
.hl-6 { background-color: #9ae6b4; }
.hl-7 { background-color: #90cdf4; }
.hl-8 { background-color: #d6bcfa; }
.hl-9 { background-color: #fca5a5; }
.hl-10 { background-color: #a7f3d0; }
.hl-11 { background-color: #ddd6fe; }

.grid-cell[data-overlap="true"] {
  box-shadow: inset 0 0 0 2px #2d3748;
}

.grid-cell.dimmed {
  opacity: 0.3;
}

.grid-cell.focused {
  opacity: 1;
  box-shadow: 0 0 0 2px #3182ce;
}

/* Results Section */
.results-section {
  margin-top: 0.5rem;
}

.results-section.hidden {
  display: none;
}

.table-wrapper {
  overflow-x: auto;
  max-height: 250px;
  overflow-y: auto;
  border: 1px solid #e2e8f0;
  border-radius: 4px;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
}

thead {
  position: sticky;
  top: 0;
  background-color: #edf2f7;
}

th, td {
  padding: 0.5rem 0.625rem;
  text-align: left;
  border-bottom: 1px solid #e2e8f0;
}

th {
  font-weight: 600;
  color: #4a5568;
  white-space: nowrap;
}

tbody tr {
  cursor: pointer;
  transition: background-color 0.15s;
}

tbody tr:hover {
  background-color: #f7fafc;
}

tbody tr.selected {
  background-color: #ebf8ff;
}

tbody tr.dimmed {
  opacity: 0.4;
}

td.word-cell {
  font-family: "Consolas", "Monaco", monospace;
  font-weight: 600;
}

td.dir-cell {
  font-size: 1.125rem;
}

.color-indicator {
  display: inline-block;
  width: 12px;
  height: 12px;
  border-radius: 2px;
  margin-right: 0.5rem;
  vertical-align: middle;
}

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.modal.hidden {
  display: none;
}

.modal-overlay {
  position: absolute;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.5);
}

.modal-content {
  position: relative;
  background-color: white;
  border-radius: 8px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
  max-width: 560px;
  width: 100%;
  max-height: 80vh;
  display: flex;
  flex-direction: column;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid #e2e8f0;
}

.modal-header h2 {
  font-size: 1.125rem;
}

.btn-modal-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  color: #718096;
  cursor: pointer;
  padding: 0.25rem;
  line-height: 1;
  border-radius: 4px;
}

.btn-modal-close:hover {
  color: #2d3748;
  background-color: #edf2f7;
}

.modal-body {
  padding: 1rem;
  overflow-y: auto;
  font-size: 0.875rem;
  line-height: 1.6;
}

.modal-body h3 {
  margin-top: 1.25rem;
  margin-bottom: 0.375rem;
  font-size: 0.9375rem;
  color: #1a365d;
}

.modal-body h3:first-child {
  margin-top: 0;
}

.modal-body p {
  margin: 0 0 0.75rem;
}

.modal-body ul {
  margin: 0 0 0.75rem;
  padding-left: 1.25rem;
}

.modal-body li {
  margin-bottom: 0.375rem;
}

.modal-body code {
  background-color: #edf2f7;
  padding: 0.125rem 0.25rem;
  border-radius: 3px;
  font-family: "Consolas", "Monaco", monospace;
  font-size: 0.8125em;
}

.modal-body .keyboard-hint {
  display: inline-block;
  background-color: #edf2f7;
  border: 1px solid #cbd5e0;
  border-radius: 3px;
  padding: 0.0625rem 0.375rem;
  font-family: "Consolas", "Monaco", monospace;
  font-size: 0.75rem;
}

/* Footer */
footer {
  background-color: #1a365d;
  color: white;
  padding: 0.875rem 1rem;
  text-align: center;
  margin-top: auto;
}

.footer {
  font-size: 0.9375rem;
}

.footer a {
  color: #90cdf4;
  text-decoration: none;
}

.footer a:hover {
  text-decoration: underline;
}

/* ========================================
   Tablet (600px+)
   ======================================== */
@media (min-width: 600px) {
  h1 {
    font-size: 1.5rem;
  }

  .subtitle {
    font-size: 0.875rem;
  }

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

  .container {
    padding: 1rem;
    max-width: 700px;
  }

  .panel {
    padding: 1rem;
  }

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

  .grid-cell {
    width: 2.25rem;
    height: 2.25rem;
  }

  .table-wrapper {
    max-height: 300px;
  }
}

/* ========================================
   Desktop (900px+)
   ======================================== */
@media (min-width: 900px) {
  h1 {
    font-size: 1.75rem;
  }

  .header-content {
    max-width: 800px;
  }

  .container {
    max-width: 800px;
  }

  .grid-cell {
    width: 2.25rem;
    height: 2.25rem;
    font-size: 1rem;
  }

  .table-wrapper {
    max-height: 400px;
  }
}