:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f5f5f5;
  --text-primary: #333333;
  --text-secondary: #666666;
  --border-color: #e0e0e0;
  --accent-color: #667eea;
  --accent-dark: #764ba2;
  --error-color: #d32f2f;
  --success-color: #388e3c;
  --warning-color: #f57c00;
}

html.dark-mode {
  --bg-primary: #1e1e1e;
  --bg-secondary: #2d2d2d;
  --text-primary: #e0e0e0;
  --text-secondary: #a0a0a0;
  --border-color: #3d3d3d;
  --accent-color: #7c8ff0;
  --accent-dark: #8d5faa;
}

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

html, body {
  width: 100%;
  height: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  transition: background-color 0.3s ease, color 0.3s ease;
}

.app-wrapper {
  display: flex;
  flex-direction: column;
  height: 100vh;
  background-color: var(--bg-primary);
}

/* ===== HEADER ===== */
.app-header {
  background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-dark) 100%);
  color: white;
  padding: 20px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  flex-shrink: 0;
}

.header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
}

.app-title {
  font-size: 1.8rem;
  font-weight: 700;
  margin: 0;
}

.header-controls {
  display: flex;
  gap: 8px;
}

.icon-btn {
  background: rgba(255, 255, 255, 0.2);
  color: white;
  border: none;
  padding: 8px 12px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 1rem;
  transition: all 0.2s ease;
}

.icon-btn:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: scale(1.05);
}

.input-group {
  display: flex;
  gap: 10px;
  margin-bottom: 15px;
  flex-wrap: wrap;
}

#urlInput {
  flex: 1;
  min-width: 200px;
  padding: 12px 16px;
  font-size: 1rem;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.95);
  color: var(--text-primary);
  outline: none;
  transition: border-color 0.3s ease;
}

#urlInput:focus {
  border-color: white;
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.2);
}

.primary-btn {
  padding: 12px 24px;
  font-size: 1rem;
  font-weight: 600;
  color: white;
  background: rgba(0, 0, 0, 0.2);
  border: 2px solid white;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.3s ease;
  white-space: nowrap;
}

.primary-btn:hover:not(:disabled) {
  background: white;
  color: var(--accent-dark);
  transform: translateY(-2px);
}

.primary-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.page-info-bar {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  padding-top: 10px;
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  font-size: 0.85rem;
  opacity: 0.9;
}

.info-item {
  display: flex;
  flex-direction: column;
}

.info-item strong {
  display: block;
  font-size: 0.75rem;
  opacity: 0.8;
  margin-bottom: 2px;
}

/* ===== TOOLBAR ===== */
.toolbar {
  display: flex;
  gap: 8px;
  padding: 10px 20px;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  flex-wrap: wrap;
  flex-shrink: 0;
}

.tool-btn {
  padding: 8px 16px;
  font-size: 0.9rem;
  color: var(--text-primary);
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.tool-btn:hover {
  background: var(--accent-color);
  color: white;
  border-color: var(--accent-color);
  transform: translateY(-1px);
}

/* ===== MAIN CONTENT ===== */
.main-content {
  display: flex;
  flex: 1;
  min-height: 0;
  overflow: hidden;
}

.content-area {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  background-color: var(--bg-primary);
}

.content-area iframe {
  border: none;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

html.dark-mode .content-area iframe {
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
}

/* ===== HISTORY SIDEBAR ===== */
.history-sidebar {
  width: 0;
  min-width: 0;
  background-color: var(--bg-secondary);
  border-left: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: width 0.3s ease;
}

.history-sidebar.open {
  width: 280px;
}

.sidebar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px;
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
}

.sidebar-header h3 {
  font-size: 1rem;
  margin: 0;
}

.close-btn {
  background: none;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

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

.history-list {
  flex: 1;
  overflow-y: auto;
  padding: 10px;
}

.history-item {
  padding: 10px;
  margin-bottom: 8px;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s ease;
  word-break: break-all;
  font-size: 0.85rem;
}

.history-item:hover {
  background-color: var(--accent-color);
  color: white;
  border-color: var(--accent-color);
  transform: translateX(2px);
}

.history-item .history-time {
  display: block;
  font-size: 0.75rem;
  opacity: 0.7;
  margin-top: 4px;
}

/* ===== FOOTER ===== */
.app-footer {
  padding: 15px;
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-secondary);
  flex-shrink: 0;
}

/* ===== MESSAGE STYLES ===== */
.message-container {
  padding: 20px;
  text-align: center;
  border-radius: 8px;
  margin: 20px auto;
  max-width: 600px;
  font-weight: 500;
}

.message-container.info {
  background-color: #e3f2fd;
  color: #1565c0;
  border: 1px solid #90caf9;
}

.message-container.error {
  background-color: #ffebee;
  color: #c62828;
  border: 1px solid #ef5350;
}

.message-container.success {
  background-color: #e8f5e9;
  color: #2e7d32;
  border: 1px solid #81c784;
}

html.dark-mode .message-container.info {
  background-color: #0d47a1;
  color: #90caf9;
  border-color: #1976d2;
}

html.dark-mode .message-container.error {
  background-color: #b71c1c;
  color: #ef5350;
  border-color: #d32f2f;
}

html.dark-mode .message-container.success {
  background-color: #1b5e20;
  color: #81c784;
  border-color: #388e3c;
}

/* ===== ANIMATIONS ===== */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

.fade-in {
  animation: fadeIn 0.3s ease-in-out;
}

.spin {
  animation: spin 1s linear infinite;
}

/* ===== SCROLLBAR ===== */
.content-area::-webkit-scrollbar,
.history-list::-webkit-scrollbar {
  width: 8px;
}

.content-area::-webkit-scrollbar-track,
.history-list::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

.content-area::-webkit-scrollbar-thumb,
.history-list::-webkit-scrollbar-thumb {
  background: var(--accent-color);
  border-radius: 4px;
}

.content-area::-webkit-scrollbar-thumb:hover,
.history-list::-webkit-scrollbar-thumb:hover {
  background: var(--accent-dark);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .app-title {
    font-size: 1.4rem;
  }

  .header-top {
    margin-bottom: 12px;
  }

  .input-group {
    flex-direction: column;
  }

  #urlInput,
  .primary-btn {
    width: 100%;
  }

  .toolbar {
    padding: 8px 15px;
  }

  .page-info-bar {
    gap: 10px;
    font-size: 0.75rem;
  }

  .history-sidebar.open {
    position: absolute;
    right: 0;
    top: 0;
    height: 100%;
    width: 100%;
    max-width: 300px;
    z-index: 100;
    border-left: none;
    box-shadow: -2px 0 8px rgba(0, 0, 0, 0.2);
  }

  .tool-btn {
    padding: 6px 12px;
    font-size: 0.85rem;
  }
}

@media (max-width: 480px) {
  .app-header {
    padding: 15px;
  }

  .app-title {
    font-size: 1.2rem;
  }

  .toolbar {
    gap: 4px;
  }

  .tool-btn {
    padding: 6px 10px;
    font-size: 0.75rem;
  }

  .icon-btn {
    padding: 6px 10px;
  }
}

.container {
  max-width: 1000px;
  margin: 0 auto;
  background: white;
  border-radius: 12px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
  padding: 40px;
}

h1 {
  color: #667eea;
  font-size: 2.5rem;
  margin-bottom: 10px;
  text-align: center;
  font-weight: 700;
}

p {
  text-align: center;
  color: #666;
  font-size: 0.9rem;
  margin-bottom: 30px;
}

.input-group {
  display: flex;
  gap: 10px;
  margin-bottom: 30px;
  flex-wrap: wrap;
}

#urlInput {
  flex: 1;
  min-width: 200px;
  padding: 12px 16px;
  font-size: 1rem;
  border: 2px solid #e0e0e0;
  border-radius: 8px;
  outline: none;
  transition: border-color 0.3s ease;
}

#urlInput:focus {
  border-color: #667eea;
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

#fetchContentButton {
  padding: 12px 32px;
  font-size: 1rem;
  font-weight: 600;
  color: white;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.3s ease;
  white-space: nowrap;
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

#fetchContentButton:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

#fetchContentButton:active:not(:disabled) {
  transform: translateY(0);
}

#fetchContentButton:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

#contentDisplay {
  min-height: 50vh;
  border: 2px solid #e0e0e0;
  border-radius: 8px;
  padding: 20px;
  background: #fafafa;
  font-size: 0.95rem;
  line-height: 1.6;
  color: #555;
  word-break: break-word;
  overflow-y: auto;
  max-height: 80vh;
}

#contentDisplay iframe {
  border: none !important;
  border-radius: 4px;
}

/* メッセージスタイル */
#contentDisplay.error {
  color: #d32f2f;
  background: #ffebee;
  border-color: #ef5350;
}

#contentDisplay.success {
  background: #f5f5f5;
  color: #333;
}

#contentDisplay.loading {
  color: #667eea;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
}

/* アニメーション */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

/* レスポンシブ */
@media (max-width: 768px) {
  .container {
    padding: 20px;
  }

  h1 {
    font-size: 1.8rem;
  }

  .input-group {
    flex-direction: column;
  }

  #urlInput,
  #fetchContentButton {
    width: 100%;
  }

  #contentDisplay {
    min-height: 40vh;
  }
}

/* スクロールバースタイル */
#contentDisplay::-webkit-scrollbar {
  width: 8px;
}

#contentDisplay::-webkit-scrollbar-track {
  background: #f1f1f1;
  border-radius: 4px;
}

#contentDisplay::-webkit-scrollbar-thumb {
  background: #667eea;
  border-radius: 4px;
}

#contentDisplay::-webkit-scrollbar-thumb:hover {
  background: #764ba2;
}