/* 3단계 사고가시화 시스템 스타일 */

:root {
  /* 단계별 색상 */
  --exploration-color: #FFD93D;
  --exploration-bg: #FFFBEB;
  --exploration-border: #FFC107;
  
  --synthesis-color: #FF8C00;
  --synthesis-bg: #FFF4E6;
  --synthesis-border: #FF6F00;
  
  --deepening-color: #4169E1;
  --deepening-bg: #EBF0FF;
  --deepening-border: #2E5BE3;
  
  /* 기본 색상 */
  --primary-color: #4a90e2;
  --secondary-color: #6c757d;
  --success-color: #28a745;
  --danger-color: #dc3545;
  --warning-color: #ffc107;
  --info-color: #17a2b8;
  
  /* 텍스트 색상 */
  --text-primary: #212529;
  --text-secondary: #6c757d;
  --text-muted: #adb5bd;
  
  /* 배경 색상 */
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-dark: #343a40;
  
  /* 기타 */
  --border-color: #dee2e6;
  --shadow-sm: 0 0.125rem 0.25rem rgba(0,0,0,.075);
  --shadow-md: 0 0.5rem 1rem rgba(0,0,0,.15);
  --shadow-lg: 0 1rem 3rem rgba(0,0,0,.175);
  --border-radius: 0.75rem;
  --transition: all 0.3s ease;
}

/* 다크 모드 */
[data-theme="dark"] {
  --text-primary: #ffffff;
  --text-secondary: #b8bfc6;
  --bg-primary: #1a1a1a;
  --bg-secondary: #2d2d2d;
  --border-color: #404040;
  
  --exploration-bg: rgba(255, 217, 61, 0.1);
  --synthesis-bg: rgba(255, 140, 0, 0.1);
  --deepening-bg: rgba(65, 105, 225, 0.1);
}

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

body {
  font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  line-height: 1.6;
  transition: var(--transition);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* 헤더 스타일 */
.header {
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(10px);
  background: rgba(255, 255, 255, 0.95);
}

[data-theme="dark"] .header {
  background: rgba(26, 26, 26, 0.95);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.25rem;
}

.logo-icon {
  font-size: 1.5rem;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 2rem;
  align-items: center;
}

.nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  transition: var(--transition);
}

.nav-link:hover {
  color: var(--primary-color);
}

.theme-toggle {
  background: transparent;
  border: 2px solid var(--border-color);
  border-radius: 2rem;
  padding: 0.5rem 1rem;
  cursor: pointer;
  font-size: 1rem;
  transition: var(--transition);
}

.theme-toggle:hover {
  border-color: var(--primary-color);
  transform: translateY(-2px);
}

/* 히어로 섹션 */
.hero {
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
  padding: 4rem 0;
  text-align: center;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 1rem;
}

.hero-title {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  font-weight: 700;
  position: relative;
}

.hero-emoji {
  display: block;
  font-size: 3rem;
  margin-bottom: 1rem;
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.hero-subtitle {
  display: block;
  font-size: 1.25rem;
  color: var(--text-secondary);
  font-weight: 400;
  margin-top: 0.5rem;
}

.hero-description {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: 3rem;
  line-height: 1.8;
}

/* 단계 흐름 표시 */
.stage-flow {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1rem;
  margin-top: 3rem;
  flex-wrap: wrap;
}

.stage-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: 2rem;
  font-weight: 600;
  transition: var(--transition);
}

.stage-item.exploration {
  background: var(--exploration-bg);
  border: 2px solid var(--exploration-border);
  color: var(--exploration-border);
}

.stage-item.synthesis {
  background: var(--synthesis-bg);
  border: 2px solid var(--synthesis-border);
  color: var(--synthesis-border);
}

.stage-item.deepening {
  background: var(--deepening-bg);
  border: 2px solid var(--deepening-border);
  color: var(--deepening-border);
}

.stage-icon {
  font-size: 1.25rem;
}

.flow-arrow {
  font-size: 1.5rem;
  color: var(--text-muted);
}

/* 섹션 스타일 */
.section-title {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  text-align: center;
}

.section-subtitle {
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: 3rem;
}

/* 추천 위자드 */
.recommend-wizard {
  background: var(--bg-secondary);
  padding: 2rem;
  border-radius: var(--border-radius);
  margin-bottom: 3rem;
}

.wizard-controls {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 1rem;
  align-items: end;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.control-group label {
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.form-select {
  padding: 0.75rem 1rem;
  border: 2px solid var(--border-color);
  border-radius: 0.5rem;
  font-size: 1rem;
  background: var(--bg-primary);
  color: var(--text-primary);
  transition: var(--transition);
}

.form-select:focus {
  outline: none;
  border-color: var(--primary-color);
}

.recommend-btn {
  padding: 0.75rem 2rem;
  background: var(--primary-color);
  color: white;
  border: none;
  border-radius: 0.5rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.recommend-btn:hover:not(:disabled) {
  background: #3a7bc8;
  transform: translateY(-2px);
}

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

/* 검색 섹션 */
.search-section {
  margin-bottom: 2rem;
}

.search-wrapper {
  position: relative;
  max-width: 600px;
  margin: 0 auto;
}

.search-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.25rem;
}

.search-input {
  width: 100%;
  padding: 1rem 1rem 1rem 3rem;
  border: 2px solid var(--border-color);
  border-radius: 2rem;
  font-size: 1rem;
  background: var(--bg-primary);
  color: var(--text-primary);
  transition: var(--transition);
}

.search-input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
}

/* 단계별 섹션 */
.stage-section {
  margin-bottom: 4rem;
}

.stage-header {
  margin-bottom: 2rem;
}

.stage-title {
  font-size: 1.75rem;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.stage-description {
  color: var(--text-secondary);
  margin-left: 3rem;
}

/* 도구 그리드 */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

/* 도구 카드 */
.tool-card {
  background: var(--bg-primary);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: 1.5rem;
  transition: var(--transition);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

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

.tool-card.exploration {
  border-color: var(--exploration-border);
  background: linear-gradient(135deg, var(--exploration-bg) 0%, var(--bg-primary) 100%);
}

.tool-card.synthesis {
  border-color: var(--synthesis-border);
  background: linear-gradient(135deg, var(--synthesis-bg) 0%, var(--bg-primary) 100%);
}

.tool-card.deepening {
  border-color: var(--deepening-border);
  background: linear-gradient(135deg, var(--deepening-bg) 0%, var(--bg-primary) 100%);
}

.tool-header {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1rem;
}

.tool-icon {
  font-size: 2rem;
  line-height: 1;
}

.tool-info {
  flex: 1;
}

.tool-title {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.tool-subtitle {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.tool-description {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.6;
  margin-bottom: 1rem;
}

.tool-process {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.process-step {
  font-size: 0.75rem;
  padding: 0.25rem 0.75rem;
  background: var(--bg-secondary);
  border-radius: 1rem;
  color: var(--text-secondary);
}

.tool-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.tool-tags {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.tool-tag {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.tool-links {
  display: flex;
  gap: 0.5rem;
}

.tool-link {
  padding: 0.375rem 0.75rem;
  background: var(--primary-color);
  color: white;
  text-decoration: none;
  border-radius: 0.375rem;
  font-size: 0.875rem;
  font-weight: 500;
  transition: var(--transition);
}

.tool-link:hover {
  background: #3a7bc8;
  transform: translateY(-2px);
}

.tool-link.new {
  background: var(--success-color);
}

/* 학습 경로 */
.pathways-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
}

.pathway-card {
  background: var(--bg-secondary);
  padding: 2rem;
  border-radius: var(--border-radius);
  text-align: center;
}

.pathway-title {
  font-size: 1.25rem;
  margin-bottom: 1.5rem;
}

.pathway-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.pathway-step {
  padding: 0.5rem 1rem;
  background: var(--bg-primary);
  border-radius: 0.5rem;
  font-weight: 500;
  white-space: nowrap;
}

/* 통계 섹션 */
.stats-section {
  background: var(--bg-secondary);
  padding: 3rem 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  text-align: center;
}

.stat-item {
  padding: 1rem;
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary-color);
  display: block;
  margin-bottom: 0.5rem;
}

.stat-label {
  color: var(--text-secondary);
  font-size: 0.9375rem;
}

/* 푸터 */
.footer {
  background: var(--bg-secondary);
  padding: 3rem 0 1.5rem;
  margin-top: 5rem;
  border-top: 1px solid var(--border-color);
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 3rem;
  margin-bottom: 2rem;
}

.footer-section h4 {
  margin-bottom: 1rem;
}

.footer-section p {
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.footer-section a {
  color: var(--primary-color);
  text-decoration: none;
}

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

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* 반응형 */
@media (max-width: 768px) {
  .nav-menu {
    gap: 1rem;
    font-size: 0.875rem;
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  .stage-flow {
    flex-direction: column;
  }
  
  .flow-arrow {
    transform: rotate(90deg);
  }
  
  .wizard-controls {
    grid-template-columns: 1fr;
  }
  
  .tools-grid {
    grid-template-columns: 1fr;
  }
  
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-content {
    grid-template-columns: 1fr;
  }
}

/* 오프라인 인디케이터 */
.offline-indicator {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: var(--danger-color);
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  font-size: 0.875rem;
  display: none;
  z-index: 9999;
}

body.offline .offline-indicator {
  display: block;
}

/* 접근성 */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* 애니메이션 */
.fade-in {
  animation: fadeIn 0.6s ease-out;
}

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

/* 추천 결과 */
.recommendation-result {
  margin-top: 2rem;
  padding: 2rem;
  background: var(--bg-primary);
  border-radius: var(--border-radius);
  border: 2px solid var(--border-color);
}

.recommendation-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.recommendation-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 0;
}

.recommendation-flow {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
  padding: 1.5rem;
  background: var(--bg-secondary);
  border-radius: var(--border-radius);
  overflow-x: auto;
}

.flow-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  min-width: 120px;
}

.flow-step-icon {
  font-size: 2rem;
}

.flow-step-title {
  font-weight: 600;
  font-size: 0.875rem;
  text-align: center;
}

.flow-step-subtitle {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.recommendation-tools {
  display: grid;
  gap: 1rem;
}