/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  color: #333;
}

/* App Container */
.app-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 20px;
}

/* Header */
.app-header {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-radius: 15px;
  padding: 20px 30px;
  margin-bottom: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.app-header h1 {
  color: #4a5568;
  font-size: 2rem;
  font-weight: 700;
}

.header-controls {
  display: flex;
  gap: 15px;
}

/* Buttons */
.btn {
  padding: 12px 20px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: white;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

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

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

.btn-success {
  background: linear-gradient(135deg, #48bb78, #38a169);
  color: white;
}

.btn-warning {
  background: linear-gradient(135deg, #ed8936, #dd6b20);
  color: white;
}

.btn-danger {
  background: linear-gradient(135deg, #f56565, #e53e3e);
  color: white;
}

.btn-help {
  background: linear-gradient(135deg, #4299e1, #3182ce);
  color: white;
  padding: 8px 15px;
  font-size: 0.9rem;
}

/* Main Content */
.main-content {
  display: grid;
  grid-template-columns: 1fr 350px;
  gap: 30px;
  align-items: start;
}

/* Puzzle Container */
.puzzle-container {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-radius: 15px;
  padding: 30px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

/* Crossword Grid */
.crossword-grid {
  display: grid;
  gap: 2px;
  background: #2d3748;
  padding: 10px;
  border-radius: 10px;
  width: fit-content;
  margin: 0 auto;
}

.grid-cell {
  width: 40px;
  height: 40px;
  border: 2px solid #e2e8f0;
  background: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 18px;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
}

.grid-cell:hover {
  background: #f7fafc;
  border-color: #4299e1;
}

.grid-cell.active {
  background: #ebf8ff;
  border-color: #3182ce;
  box-shadow: 0 0 10px rgba(66, 153, 225, 0.3);
}

.grid-cell.correct {
  background: #c6f6d5;
  border-color: #48bb78;
}

.grid-cell.incorrect {
  background: #fed7d7;
  border-color: #f56565;
}

/* Clue Cell Styles */
.clue-cell {
  background: linear-gradient(135deg, #4a5568, #2d3748);
  color: white;
  font-size: 8px;
  font-weight: 600;
  text-align: center;
  padding: 2px;
  line-height: 1.2;
  flex-direction: column;
  justify-content: flex-start;
  align-items: flex-start;
}

.clue-cell.horizontal {
  border-right: 3px solid #4299e1;
}

.clue-cell.vertical {
  border-bottom: 3px solid #4299e1;
}

.clue-text {
  font-size: 7px;
  line-height: 1.1;
  word-wrap: break-word;
  text-align: left;
}

.arrow {
  position: absolute;
  font-size: 12px;
  color: #4299e1;
  font-weight: bold;
}

.arrow-right {
  right: 2px;
  top: 50%;
  transform: translateY(-50%);
}

.arrow-down {
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
}

/* Input Cell Styles */
.input-cell {
  background: white;
  border: 2px solid #cbd5e0;
}

.input-cell input {
  width: 100%;
  height: 100%;
  border: none;
  background: transparent;
  text-align: center;
  font-weight: bold;
  font-size: 18px;
  color: #2d3748;
  text-transform: uppercase;
}

.input-cell input:focus {
  outline: none;
  background: #ebf8ff;
}

/* Blocked Cell */
.blocked-cell {
  background: #2d3748;
  border: 2px solid #2d3748;
}

/* Sidebar */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* Solver Tools */
.solver-tools, .game-controls {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-radius: 15px;
  padding: 25px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.solver-tools h3 {
  color: #4a5568;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.solver-section {
  margin-bottom: 20px;
}

.solver-section h4 {
  color: #2d3748;
  margin-bottom: 10px;
  font-size: 1rem;
}

.solver-section input {
  width: 100%;
  padding: 10px;
  border: 2px solid #e2e8f0;
  border-radius: 6px;
  margin-bottom: 10px;
  font-size: 14px;
}

.solver-section input:focus {
  outline: none;
  border-color: #4299e1;
}

.solver-results {
  max-height: 100px;
  overflow-y: auto;
  background: #f7fafc;
  border-radius: 6px;
  padding: 10px;
  margin-top: 10px;
}

.solver-result {
  padding: 5px 0;
  cursor: pointer;
  border-bottom: 1px solid #e2e8f0;
}

.solver-result:hover {
  background: #ebf8ff;
}

.solver-result:last-child {
  border-bottom: none;
}

/* Progress Section */
.progress-section h4 {
  color: #2d3748;
  margin-bottom: 10px;
}

.progress-bar {
  width: 100%;
  height: 10px;
  background: #e2e8f0;
  border-radius: 5px;
  overflow: hidden;
  margin-bottom: 10px;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #48bb78, #38a169);
  width: 0%;
  transition: width 0.3s ease;
}

#progressText {
  font-size: 14px;
  color: #4a5568;
  font-weight: 600;
}

/* Game Controls */
.game-controls {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.game-controls .btn {
  width: 100%;
  justify-content: center;
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
}

.modal-content {
  background-color: white;
  margin: 15% auto;
  padding: 30px;
  border-radius: 15px;
  width: 80%;
  max-width: 500px;
  position: relative;
}

.close {
  color: #aaa;
  float: right;
  font-size: 28px;
  font-weight: bold;
  cursor: pointer;
}

.close:hover {
  color: #000;
}

.settings-group {
  margin-bottom: 20px;
}

.settings-group label {
  display: block;
  margin-bottom: 5px;
  font-weight: 600;
}

.settings-group select {
  width: 100%;
  padding: 10px;
  border: 2px solid #e2e8f0;
  border-radius: 6px;
}

/* Responsive Design */
@media (max-width: 1024px) {
  .main-content {
    grid-template-columns: 1fr;
  }

  .sidebar {
    order: -1;
  }
}

@media (max-width: 768px) {
  .app-header {
    flex-direction: column;
    gap: 15px;
    text-align: center;
  }

  .header-controls {
    justify-content: center;
  }

  .grid-cell {
    width: 35px;
    height: 35px;
    font-size: 16px;
  }

  .clue-text {
    font-size: 6px;
  }
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.crossword-grid {
  animation: fadeIn 0.5s ease-out;
}

/* Success Animation */
@keyframes success {
  0% { transform: scale(1); }
  50% { transform: scale(1.1); }
  100% { transform: scale(1); }
}

.correct {
  animation: success 0.3s ease;
}

/* Loading Animation */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid #f3f3f3;
  border-top: 3px solid #4299e1;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}