/* Modern Word Search Printable - Premium Design */
:root {
  /* Primary Colors - Modern Purple & Blue Gradient */
  --primary-color: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #818cf8;

  /* Accent Colors */
  --accent-color: #ec4899;
  --accent-light: #f9a8d4;

  /* Success/Found Colors */
  --success-color: #10b981;
  --success-light: #d1fae5;

  /* Neutral Colors */
  --bg-color: #f8fafc;
  --bg-secondary: #ffffff;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --border-color: #e2e8f0;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 0.75rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;

  /* Transitions */
  --transition-base: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  background-attachment: fixed;
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing-xl);
}

/* Header Styles */
.site-header {
  background: var(--bg-secondary);
  box-shadow: var(--shadow-lg);
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(10px);
  background: rgba(255, 255, 255, 0.95);
}

.header-content {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing-lg) var(--spacing-xl);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  text-decoration: none;
  color: var(--text-primary);
}

.logo-icon {
  font-size: 2.5rem;
}

.logo-text h1 {
  font-size: 1.75rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo-text p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-top: -4px;
}

.header-actions {
  display: flex;
  gap: var(--spacing-md);
}

/* Button Styles */
.btn {
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-lg);
  font-weight: 600;
  font-size: 0.9375rem;
  cursor: pointer;
  border: none;
  transition: var(--transition-base);
  text-decoration: none;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-secondary {
  background: var(--bg-color);
  color: var(--text-primary);
  border: 2px solid var(--border-color);
}

.btn-secondary:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
}

.btn-success {
  background: linear-gradient(135deg, var(--success-color), #059669);
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-accent {
  background: linear-gradient(135deg, var(--accent-color), #db2777);
  color: white;
  box-shadow: var(--shadow-md);
}

/* Popular Theme Cards */
.popular-theme-card {
  display: block;
  padding: 1.5rem;
  background: rgba(255, 255, 255, 0.95);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--text-primary);
  transition: all 0.3s ease;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.popular-theme-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.2);
  background: white;
}

.popular-theme-card .theme-icon {
  font-size: 2.5rem;
  display: block;
  margin-bottom: 0.75rem;
}

.popular-theme-card h4 {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--primary-color);
  margin: 0 0 0.5rem 0;
}

.popular-theme-card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.4;
}

/* Hero Section */
.hero {
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
  padding: var(--spacing-2xl);
  margin-bottom: var(--spacing-xl);
  text-align: center;
  box-shadow: var(--shadow-xl);
}

.hero h2 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: var(--spacing-md);
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 700px;
  margin: 0 auto var(--spacing-xl);
}

.hero-actions {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

.hero-actions .btn {
  font-size: 1.125rem;
  padding: var(--spacing-md) var(--spacing-xl);
}

/* Category Navigation */
.category-nav {
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
  box-shadow: var(--shadow-lg);
}

.category-nav h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-lg);
  color: var(--text-primary);
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
}

.category-card {
  background: linear-gradient(135deg, #f8fafc 0%, #e0e7ff 100%);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  cursor: pointer;
  transition: var(--transition-base);
  border: 2px solid transparent;
}

.category-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-color);
}

.category-card-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.category-icon {
  font-size: 2rem;
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: white;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.category-card h4 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.category-card .theme-count {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.theme-list {
  list-style: none;
  display: grid;
  gap: var(--spacing-xs);
}

.theme-list li {
  padding: var(--spacing-sm);
  background: white;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition-base);
  font-size: 0.9375rem;
}

.theme-list li:hover {
  background: var(--primary-light);
  color: white;
  transform: translateX(4px);
}

/* Custom Creator Section */
.custom-creator {
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
  box-shadow: var(--shadow-lg);
}

.custom-creator h3 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: var(--spacing-lg);
  color: var(--text-primary);
}

.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: var(--spacing-md);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-family: inherit;
  transition: var(--transition-base);
  background: var(--bg-color);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-md);
}

/* Puzzle Container */
.puzzle-container {
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-xl);
  margin-bottom: var(--spacing-xl);
}

.puzzle-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-lg);
  border-bottom: 3px solid var(--border-color);
}

.puzzle-title {
  font-size: 2rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.print-domain {
  display: none;
  white-space: normal;
  line-height: 1.4;
}

.puzzle-actions {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  margin-top: var(--spacing-lg);
  flex-wrap: wrap;
}

.puzzle-content {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: var(--spacing-xl);
}

@media (max-width: 968px) {
  .puzzle-content {
    grid-template-columns: 1fr;
  }
}

/* Word Grid */
.grid-container {
  display: flex;
  justify-content: center;
  align-items: flex-start;
}

.word-grid {
  border-collapse: collapse;
  background: white;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  user-select: none;
}

.word-grid td {
  width: 35px;
  height: 35px;
  text-align: center;
  font-weight: 700;
  font-size: 1.125rem;
  border: 1px solid var(--border-color);
  cursor: pointer;
  transition: all 0.15s ease;
  color: var(--text-primary);
  background: white;
  position: relative;
  z-index: 1;
}

.word-grid td:hover {
  background: rgba(99, 102, 241, 0.1);
  transform: scale(1.02);
}

.word-grid td.selected {
  /* 不显示背景，只让 SVG 线条显示 */
  color: var(--text-primary);
  font-weight: 700;
  position: relative;
}

.word-grid td.found {
  /* 找到后也不显示背景 */
  color: var(--text-primary);
  font-weight: 700;
  position: relative;
}

/* Word List */
.word-list-container {
  background: linear-gradient(135deg, #f8fafc 0%, #e0e7ff 100%);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.word-list-container h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.word-list {
  list-style: none;
  display: grid;
  gap: var(--spacing-sm);
}

.word-list li {
  padding: var(--spacing-sm) var(--spacing-md);
  background: white;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9375rem;
  transition: var(--transition-base);
  border-left: 4px solid transparent;
}

.word-list li:hover {
  border-left-color: var(--primary-color);
  transform: translateX(4px);
}

.word-list li.found {
  background: var(--success-light);
  color: var(--success-color);
  text-decoration: line-through;
  border-left-color: var(--success-color);
}

/* Answer Key Styles */
.answer-key .word-grid td.answer-highlight {
  background: linear-gradient(135deg, #fef3c7, #fde68a);
  color: var(--text-primary);
  font-weight: 800;
}

.answer-key .word-grid td.answer-faded {
  background: #f3f4f6;
  color: #d1d5db;
}

.answer-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.direction {
  font-size: 0.75rem;
  color: var(--text-secondary);
  font-style: italic;
}

/* Ad Placeholder */
.ad-container {
  background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
  text-align: center;
  border: 2px dashed #f59e0b;
  min-height: 250px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.ad-container p {
  font-size: 0.875rem;
  color: #92400e;
  font-weight: 600;
}

/* Footer */
.site-footer {
  background: rgba(255, 255, 255, 0.95);
  margin-top: var(--spacing-2xl);
  padding: var(--spacing-xl);
  text-align: center;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
}

.site-footer p {
  color: var(--text-secondary);
  font-size: 0.9375rem;
}

.site-footer a {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 600;
}

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

/* Utility Classes */
.hidden {
  display: none !important;
}

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

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.mb-4 { margin-bottom: var(--spacing-xl); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mt-4 { margin-top: var(--spacing-xl); }

/* Print Styles */
@media print {
  * {
    margin: 0;
    padding: 0;
  }

  body {
    background: white;
    margin: 0;
    padding: 0;
    font-size: 10pt;
  }

  .container > *:not(#puzzleDisplay) {
    display: none !important;
  }

  #puzzleDisplay {
    margin: 0;
    padding: 0;
    width: 100%;
  }

  /* Hide all non-essential elements */
  .site-header,
  .hero,
  .category-nav,
  .custom-creator,
  .puzzle-actions,
  .ad-container,
  .site-footer,
  .btn,
  #selectionOverlay {
    display: none !important;
  }

  .container {
    max-width: 100%;
    padding: 0;
    margin: 0;
    width: 100%;
    height: 100%;
  }

  .puzzle-container {
    box-shadow: none;
    padding: 0;
    margin: 0;
    page-break-inside: avoid;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
  }

  .puzzle-header {
    margin-bottom: 0.3cm;
    padding-bottom: 0.2cm;
    border-bottom: 2px solid #000;
  }

  .puzzle-title {
    font-size: 14pt;
    font-weight: bold;
    margin: 0;
    padding: 0;
    color: #000 !important;
    background: none !important;
    -webkit-background-clip: unset !important;
    -webkit-text-fill-color: unset !important;
  }

  .print-domain {
    display: block !important;
    font-size: 10pt;
    font-weight: 600;
    letter-spacing: 0.05em;
    margin-top: 0.15cm;
    color: #000;
    text-align: center;
    white-space: normal;
  }

  .puzzle-content {
    display: flex;
    flex-direction: row;
    gap: 0.5cm;
    align-items: flex-start;
    justify-content: space-between;
    width: 100%;
  }

  .grid-container {
    display: block;
    flex-shrink: 0;
    position: relative;
  }

  /* SVG overlay - hide in print */
  svg {
    display: none !important;
  }

  .word-grid {
    border-collapse: collapse;
    background: white;
    margin: 0;
    border: none;
  }

  .word-grid td {
    width: 0.5cm;
    height: 0.5cm;
    border-top: 1px solid #333;
    border-left: 1px solid #333;
    text-align: center;
    font-size: 9pt;
    font-weight: 700;
    padding: 0;
    line-height: 0.5cm;
    vertical-align: middle;
    box-sizing: border-box;
  }

  .word-grid tr:last-child td {
    border-bottom: 1px solid #333;
  }

  .word-grid td:last-child {
    border-right: 1px solid #333;
  }

  .word-list-container {
    background: white;
    padding: 0;
    margin: 0;
    box-shadow: none;
    flex: 1;
    max-width: 6cm;
  }

  .word-list-container h3 {
    font-size: 11pt;
    font-weight: bold;
    margin: 0 0 0.3cm 0;
    color: #000;
  }

  .word-list {
    display: block;
    column-count: 1;
    gap: 0.15cm;
    margin: 0;
    padding: 0;
    list-style: none;
  }

  .word-list li {
    background: white;
    border: none;
    padding: 0.1cm 0;
    font-size: 9pt;
    break-inside: avoid;
    margin: 0;
    line-height: 1.3;
  }

  .word-list li::before {
    content: "□ ";
    margin-right: 0.2cm;
  }

  .word-list li.found::before {
    content: "☑ ";
  }

  /* Answer key specific styles */
  .answer-key .word-grid td.answer-highlight {
    background: #e5e5e5 !important;
    font-weight: 900;
  }

  .answer-key .word-grid td.answer-faded {
    background: #fafafa !important;
    color: #999 !important;
  }

  /* Force single page and optimize layout */
  @page {
    size: A4 portrait;
    margin: 0.8cm;
  }

  html, body {
    width: 210mm;
    height: 297mm;
    overflow: hidden;
  }

  /* Ensure no page breaks */
  * {
    page-break-inside: avoid !important;
    page-break-before: avoid !important;
    page-break-after: avoid !important;
  }
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: var(--spacing-md);
  }

  .header-content {
    flex-direction: column;
    gap: var(--spacing-md);
    text-align: center;
  }

  .hero h2 {
    font-size: 2rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .category-grid {
    grid-template-columns: 1fr;
  }

  .word-grid td {
    width: 25px;
    height: 25px;
    font-size: 0.875rem;
  }

  .puzzle-content {
    grid-template-columns: 1fr;
  }
}

/* Loading Animation */
@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

/* Success Animation */
@keyframes successPulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

.word-list li.found {
  animation: successPulse 0.6s ease-in-out;
}