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

:root {
  --bg-color: #ffffff;
  --text-color: #333333;
  --border-color: #e0e0e0;
  --primary-color: #4285f4;
  --hover-color: #357ae8;
  --card-bg: #ffffff;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.15);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #1a1a1a;
    --text-color: #e0e0e0;
    --border-color: #333333;
    --primary-color: #5a9ef4;
    --hover-color: #4a8ee4;
    --card-bg: #2a2a2a;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.4);
  }
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
}

#app {
  max-width: 1400px;
  margin: 0 auto;
  padding: 20px;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 30px;
  padding-bottom: 20px;
  border-bottom: 2px solid var(--border-color);
}

header h1 {
  font-size: 2rem;
  font-weight: 600;
}

.header-actions {
  display: flex;
  gap: 10px;
}

.upload-btn,
.clear-btn,
.share-btn {
  padding: 10px 20px;
  background-color: var(--primary-color);
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 500;
  transition: background-color 0.2s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  line-height: 1;
}

.upload-btn:hover,
.clear-btn:hover,
.share-btn:hover {
  background-color: var(--hover-color);
}

.clear-btn {
  background-color: #dc3545;
}

.clear-btn:hover {
  background-color: #c82333;
}

.share-btn {
  background-color: #9c27b0;
}

.share-btn:hover {
  background-color: #7b1fa2;
}

.drop-zone {
  border: 3px dashed var(--border-color);
  border-radius: 12px;
  padding: 60px 20px;
  text-align: center;
  margin-bottom: 30px;
  cursor: pointer;
  transition: all 0.3s;
  background-color: var(--card-bg);
}

.drop-zone:hover,
.drop-zone.dragover {
  border-color: var(--primary-color);
  background-color: rgba(66, 133, 244, 0.05);
}

.drop-zone p {
  font-size: 1.2rem;
  color: var(--text-color);
}

.tabs {
  display: flex;
  gap: 10px;
  margin-bottom: 30px;
  border-bottom: 2px solid var(--border-color);
}

.tab-btn {
  padding: 12px 24px;
  background: none;
  border: none;
  border-bottom: 3px solid transparent;
  color: var(--text-color);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

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

.tab-btn.active {
  color: var(--primary-color);
  border-bottom-color: var(--primary-color);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  gap: 20px;
}

.spinner {
  width: 50px;
  height: 50px;
  border: 4px solid var(--border-color);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.empty-message {
  text-align: center;
  padding: 60px 20px;
  font-size: 1.2rem;
  color: #999;
}

/* 타임라인 스타일 */
.year-section {
  margin-bottom: 50px;
}

.year-header {
  font-size: 2rem;
  font-weight: 600;
  margin-bottom: 30px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--border-color);
}

.month-section {
  margin-bottom: 40px;
}

.month-header {
  font-size: 1.5rem;
  font-weight: 500;
  margin-bottom: 15px;
  color: var(--primary-color);
}

.zip-download-btn {
  margin-bottom: 20px;
  padding: 8px 16px;
  background-color: #28a745;
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: background-color 0.2s;
}

.zip-download-btn:hover {
  background-color: #218838;
}

.photo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 20px;
  margin-bottom: 30px;
}

.photo-card {
  background-color: var(--card-bg);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
}

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

.photo-card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  display: block;
}

.photo-info {
  padding: 12px;
}

.photo-date {
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--text-color);
}

.photo-model {
  font-size: 0.8rem;
  color: #666;
}

@media (prefers-color-scheme: dark) {
  .photo-model {
    color: #999;
  }
}

/* 모달 스타일 */
.photo-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 20px;
}

.modal-content {
  position: relative;
  max-width: 90vw;
  max-height: 90vh;
  background-color: var(--card-bg);
  border-radius: 12px;
  padding: 20px;
  overflow-y: auto;
}

.modal-close {
  position: absolute;
  top: 10px;
  right: 20px;
  font-size: 2rem;
  color: var(--text-color);
  cursor: pointer;
  line-height: 1;
  z-index: 1001;
}

.modal-close:hover {
  color: var(--primary-color);
}

.modal-content img {
  max-width: 100%;
  max-height: 70vh;
  display: block;
  margin: 0 auto 20px;
  border-radius: 8px;
}

.modal-info {
  color: var(--text-color);
}

.modal-info p {
  margin-bottom: 8px;
}

.map-link {
  color: #4285f4;
  text-decoration: none;
  font-weight: 500;
  display: inline-block;
  margin-top: 4px;
}

.map-link:hover {
  text-decoration: underline;
}

/* 작은 지도 스타일 (모달 내) */
.mini-map {
  width: 100%;
  height: 250px;
  margin-top: 15px;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 2px solid var(--border-color);
}

/* 지도 스타일 */
#map-view {
  width: 100%;
  height: 600px;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
}

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

.map-popup img {
  max-width: 200px;
  max-height: 200px;
  border-radius: 8px;
  margin-bottom: 8px;
}

.map-popup p {
  margin: 4px 0;
  font-size: 0.9rem;
}

/* 반응형 디자인 */
@media (max-width: 768px) {
  header {
    flex-direction: column;
    align-items: flex-start;
    gap: 15px;
  }

  header h1 {
    font-size: 1.5rem;
  }

  .photo-grid {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 15px;
  }

  .year-header {
    font-size: 1.5rem;
  }

  .month-header {
    font-size: 1.2rem;
  }

  #map-view {
    height: 400px;
  }
}

/* 기능 소개 섹션 */
.features-section {
  max-width: 1200px;
  margin: 60px auto;
  padding: 40px 20px;
}

.features-section h2 {
  font-size: 2rem;
  margin-bottom: 40px;
  text-align: center;
  color: var(--text-color);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 25px;
}

.feature-card {
  background-color: var(--card-bg);
  border-radius: 12px;
  padding: 25px;
  box-shadow: var(--shadow);
  transition: transform 0.2s, box-shadow 0.2s;
}

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

.feature-card h3 {
  font-size: 1.3rem;
  margin-bottom: 12px;
  color: var(--primary-color);
}

.feature-card p {
  color: var(--text-color);
  line-height: 1.8;
  margin: 0;
}

/* 사용 가이드 섹션 */
.guide-section {
  max-width: 1000px;
  margin: 60px auto;
  padding: 40px 20px;
  background-color: var(--card-bg);
  border-radius: 12px;
}

.guide-section h2 {
  font-size: 2rem;
  margin-bottom: 40px;
  text-align: center;
  color: var(--text-color);
}

.guide-steps {
  display: flex;
  flex-direction: column;
  gap: 30px;
}

.guide-step {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.step-number {
  flex-shrink: 0;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background-color: var(--primary-color);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: bold;
}

.step-content {
  flex: 1;
}

.step-content h3 {
  font-size: 1.3rem;
  margin-bottom: 10px;
  color: var(--text-color);
}

.step-content p {
  color: var(--text-color);
  line-height: 1.8;
  margin: 0;
}

/* FAQ 섹션 */
.faq-section {
  max-width: 1000px;
  margin: 60px auto;
  padding: 40px 20px;
}

.faq-section h2 {
  font-size: 2rem;
  margin-bottom: 30px;
  text-align: center;
  color: var(--text-color);
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.faq-item {
  background-color: var(--card-bg);
  border-radius: 12px;
  padding: 25px;
  box-shadow: var(--shadow);
  transition: box-shadow 0.2s;
}

.faq-item:hover {
  box-shadow: var(--shadow-hover);
}

.faq-item h3 {
  font-size: 1.2rem;
  margin-bottom: 12px;
  color: var(--primary-color);
}

.faq-item p {
  color: var(--text-color);
  line-height: 1.8;
  margin: 0;
}

/* 푸터 */
.footer {
  background-color: var(--card-bg);
  border-top: 2px solid var(--border-color);
  margin-top: 60px;
  padding: 40px 20px 20px;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 40px;
  margin-bottom: 30px;
}

.footer-section h3 {
  font-size: 1.2rem;
  margin-bottom: 15px;
  color: var(--text-color);
}

.footer-section p {
  color: var(--text-color);
  line-height: 1.8;
  margin: 0;
}

.footer-section ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-section ul li {
  margin-bottom: 10px;
}

.footer-section a {
  color: var(--text-color);
  text-decoration: none;
  transition: color 0.2s;
}

.footer-section a:hover {
  color: var(--primary-color);
}

.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
  text-align: center;
  color: var(--text-color);
}

.footer-bottom p {
  margin: 0;
  font-size: 0.9rem;
}

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

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

@media (max-width: 768px) {
  .features-section,
  .guide-section,
  .faq-section {
    margin: 40px auto;
    padding: 20px;
  }

  .features-section h2,
  .guide-section h2,
  .faq-section h2 {
    font-size: 1.5rem;
  }

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

  .guide-step {
    flex-direction: column;
    text-align: center;
  }

  .step-number {
    margin: 0 auto;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: 30px;
  }
}


/* 공유 Bottom Sheet */
.share-sheet {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 2000;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, visibility 0.3s;
}

.share-sheet.active {
  opacity: 1;
  visibility: visible;
}

.share-sheet-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  cursor: pointer;
}

.share-sheet-content {
  position: relative;
  background-color: var(--card-bg);
  border-radius: 20px 20px 0 0;
  width: 100%;
  max-width: 600px;
  max-height: 80vh;
  padding: 0;
  z-index: 2001;
  transform: translateY(100%);
  transition: transform 0.3s ease-out;
  overflow-y: auto;
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.2);
}

.share-sheet.active .share-sheet-content {
  transform: translateY(0);
}

.share-sheet-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px;
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  background-color: var(--card-bg);
  z-index: 10;
}

.share-sheet-header h2 {
  margin: 0;
  font-size: 1.5rem;
  color: var(--text-color);
}

.share-close-btn {
  background: none;
  border: none;
  font-size: 2rem;
  color: var(--text-color);
  cursor: pointer;
  padding: 0;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: background-color 0.2s;
}

.share-close-btn:hover {
  background-color: var(--border-color);
}

.share-preview {
  padding: 20px;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
}

.share-preview-content {
  display: inline-block;
  max-width: 100%;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.share-options {
  padding: 20px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 15px;
}

.share-option-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 20px;
  background-color: var(--card-bg);
  border: 2px solid var(--border-color);
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s;
  font-size: 0.9rem;
  color: var(--text-color);
}

.share-option-btn:hover {
  border-color: var(--primary-color);
  background-color: rgba(66, 133, 244, 0.1);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.share-icon {
  font-size: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
}

.share-icon svg {
  width: 100%;
  height: 100%;
  max-width: 40px;
  max-height: 40px;
}

.share-icon-kakao svg {
  border-radius: 8px;
}

.share-icon-insta svg {
  border-radius: 8px;
}

.share-icon-twitter svg {
  border-radius: 50%;
}

.share-icon-facebook svg {
  border-radius: 50%;
}

.share-message {
  padding: 20px;
  border-top: 1px solid var(--border-color);
}

.share-message h3 {
  margin: 0 0 15px 0;
  font-size: 1.1rem;
  color: var(--text-color);
}

.share-message-text {
  background-color: var(--bg-color);
  padding: 15px;
  border-radius: 8px;
  margin-bottom: 15px;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--text-color);
  border: 1px solid var(--border-color);
  font-size: 0.9rem;
  line-height: 1.6;
}

.share-copy-message-btn {
  width: 100%;
  padding: 12px;
  background-color: var(--primary-color);
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 500;
  transition: background-color 0.2s;
}

.share-copy-message-btn:hover {
  background-color: var(--hover-color);
}

.share-instagram-hint {
  margin-top: 15px;
  padding: 12px;
  background-color: rgba(156, 39, 176, 0.1);
  border-left: 4px solid #9c27b0;
  border-radius: 4px;
  font-size: 0.85rem;
  color: var(--text-color);
  line-height: 1.6;
}

@media (max-width: 768px) {
  .share-sheet-content {
    max-height: 85vh;
  }

  .share-options {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }

  .share-option-btn {
    padding: 15px;
    font-size: 0.8rem;
  }

  .share-icon {
    font-size: 1.5rem;
    width: 32px;
    height: 32px;
  }
  
  .share-icon svg {
    max-width: 32px;
    max-height: 32px;
  }
}

/* 더 많은 테스트 해보기 버튼 */
#more-tests-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  min-height: 44px;
  line-height: 1;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
  position: relative;
  overflow: hidden;
}

#more-tests-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  transition: left 0.5s;
}

#more-tests-btn:hover::before {
  left: 100%;
}

#more-tests-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(102, 126, 234, 0.5);
  background: linear-gradient(135deg, #764ba2 0%, #667eea 100%);
}

#more-tests-btn:active {
  transform: translateY(0);
  box-shadow: 0 2px 10px rgba(102, 126, 234, 0.4);
}

#more-tests-btn svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
  stroke: currentColor;
}

@media (prefers-color-scheme: dark) {
  #more-tests-btn {
    background: linear-gradient(135deg, #7c3aed 0%, #a855f7 100%);
    box-shadow: 0 4px 15px rgba(124, 58, 237, 0.4);
  }
  
  #more-tests-btn:hover {
    box-shadow: 0 6px 20px rgba(124, 58, 237, 0.5);
    background: linear-gradient(135deg, #a855f7 0%, #7c3aed 100%);
  }
}