/* 
 * Skills Tree Application - Main Stylesheet
 * Modern skill tree visualization with game-like elements
 */

:root {
  /* Color Palette */
  --primary-color: #3498db;
  --secondary-color: #2ecc71;
  --accent-color: #9b59b6;
  --success-color: #27ae60;
  --warning-color: #f39c12;
  --danger-color: #e74c3c;
  
  /* Dimension Colors */
  --dimension-daily-life: #3498db;
  --dimension-financial: #e67e22;
  --dimension-career: #9b59b6;
  --dimension-network: #1abc9c;
  --dimension-social-responsibility: #e91e63;
  
  /* Background & Surface */
  --bg-primary: #f8f9fa;
  --bg-secondary: #ffffff;
  --card-bg: rgba(255, 255, 255, 0.95);
  --border-color: #e0e0e0;
  
  /* Text Colors */
  --text-primary: #2c3e50;
  --text-secondary: #7f8c8d;
  --text-muted: #95a5a6;
  
  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.2);
  --shadow-xl: 0 12px 48px rgba(0, 0, 0, 0.25);
  
  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  
  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 
               'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

/* Header Section */
.app-header {
  background: rgba(255, 255, 255, 0.95);
  padding: var(--spacing-lg) var(--spacing-xl);
  text-align: center;
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(10px);
}

.app-header h1 {
  font-size: 2.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-sm);
}

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

/* Main Container */
.main-container {
  max-width: 1600px;
  margin: 0 auto;
  padding: var(--spacing-xl);
}

/* Stats Overview Card */
.stats-overview {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

.stat-card {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  text-align: center;
  box-shadow: var(--shadow-md);
  transition: var(--transition-normal);
}

.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.stat-number {
  font-size: 3rem;
  font-weight: 700;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: var(--spacing-xs);
}

/* Skills Tree Container */
.skills-tree-container {
  position: relative;
  min-height: 80vh;
  padding: var(--spacing-xl) 0;
  overflow-x: auto;
}

/* Skill Node Styles */
.skill-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  cursor: pointer;
  transition: var(--transition-normal);
  position: relative;
  animation: fadeInUp 0.6s ease forwards;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.skill-node:hover {
  animation: pulse 0.5s ease;
}

@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); }
}

.skill-node-card {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  width: 280px;
  min-height: 240px;
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  border: 3px solid transparent;
  transition: var(--transition-normal);
}

.skill-node:hover .skill-node-card {
  box-shadow: var(--shadow-xl);
  transform: translateY(-8px);
}

.skill-node-card.level-junior {
  border-color: var(--dimension-daily-life);
  background: linear-gradient(135deg, #f0f8ff 0%, #e6f7ff 100%);
}

.skill-node-card.level-middle {
  border-color: var(--dimension-financial);
  background: linear-gradient(135deg, #fff9f0 0%, #fff3e0 100%);
}

.skill-node-card.level-senior {
  border-color: var(--dimension-career);
  background: linear-gradient(135deg, #fbf8ff 0%, #f3e8ff 100%);
}

.skill-node-card.level-unassigned {
  border-color: var(--text-muted);
  background: #f5f5f5;
  opacity: 0.7;
}

.skill-icon {
  font-size: 4rem;
  margin-bottom: var(--spacing-sm);
}

.skill-name {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.skill-description {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
  line-height: 1.5;
}

/* Progress Indicators */
.level-indicator {
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  color: white;
  margin-bottom: var(--spacing-sm);
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.level-indicator.junior {
  background: linear-gradient(135deg, #3498db 0%, #2980b9 100%);
}

.level-indicator.middle {
  background: linear-gradient(135deg, #2ecc71 0%, #27ae60 100%);
}

.level-indicator.senior {
  background: linear-gradient(135deg, #9b59b6 0%, #8e44ad 100%);
}

.progress-bar {
  width: 100%;
  height: 8px;
  background: #e0e0e0;
  border-radius: 4px;
  overflow: hidden;
  margin-top: auto;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
  border-radius: 4px;
  transition: width 0.5s ease;
}

.level-badge {
  position: absolute;
  top: -10px;
  right: -10px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  box-shadow: var(--shadow-md);
}

/* Connection Lines */
.connection-lines {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
}

/* Modal Styles */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-normal);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  max-width: 700px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
  transform: scale(0.9);
  transition: var(--transition-normal);
}

.modal-overlay.active .modal-content {
  transform: scale(1);
}

.modal-header {
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-header h2 {
  font-size: 1.5rem;
  color: var(--text-primary);
}

.close-btn {
  background: none;
  border: none;
  font-size: 2rem;
  cursor: pointer;
  color: var(--text-muted);
  transition: var(--transition-fast);
}

.close-btn:hover {
  color: var(--danger-color);
}

.modal-body {
  padding: var(--spacing-lg);
}

/* Completion List */
.completion-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
}

.completion-item {
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  background: var(--bg-primary);
  border-left: 4px solid #667eea;
  transition: var(--transition-fast);
}

.completion-item:hover {
  background: #f0f0f0;
  transform: translateX(4px);
}

.completion-item.completed {
  background: linear-gradient(135deg, #d4edda 0%, #c3e6cb 100%);
  border-left-color: var(--success-color);
  opacity: 0.7;
}

.completion-item-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xs);
  text-transform: uppercase;
}

.completion-item-text {
  font-size: 1rem;
  color: var(--text-primary);
  line-height: 1.5;
}

/* Learning Path Section */
.learning-path {
  margin-top: var(--spacing-lg);
  padding: var(--spacing-md);
  background: linear-gradient(135deg, #e8f4fd 0%, #d9edf7 100%);
  border-radius: var(--radius-md);
}

.learning-path h3 {
  color: #31708f;
  margin-bottom: var(--spacing-sm);
  font-size: 1.1rem;
}

.learning-tips {
  list-style: none;
}

.learning-tips li {
  padding: var(--spacing-xs) 0;
  padding-left: var(--spacing-md);
  position: relative;
  color: var(--text-primary);
  font-size: 0.95rem;
}

.learning-tips li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--success-color);
  font-weight: bold;
}

/* Controls Section */
.controls-section {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-top: var(--spacing-xl);
  box-shadow: var(--shadow-md);
}

.btn-group {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.btn {
  padding: var(--spacing-sm) var(--spacing-lg);
  border: none;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.btn-primary {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
}

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

.btn-secondary {
  background: #f8f9fa;
  color: var(--text-primary);
  border: 2px solid var(--border-color);
}

.btn-secondary:hover {
  background: #e9ecef;
}

.btn-danger {
  background: linear-gradient(135deg, #e74c3c 0%, #c0392b 100%);
  color: white;
}

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

/* Footer */
.app-footer {
  text-align: center;
  padding: var(--spacing-lg);
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
  .app-header h1 {
    font-size: 1.8rem;
  }
  
  .skill-node-card {
    width: 240px;
    min-height: 220px;
    padding: var(--spacing-md);
  }
  
  .completion-list {
    grid-template-columns: 1fr;
  }
}