/* ========================================
   以太幣雜談 - 主樣式表
   Ethereum Knowledge Base - Main Stylesheet
   ======================================== */

/* 模組化 CSS 引入 */
@import url('variables.css');
@import url('base.css');
@import url('layout.css');
@import url('components-header.css');
@import url('components.css');
@import url('animations.css');
@import url('utilities.css');
@import url('blockchain-viz.css');
@import url('mobile-perf.css');

/* ========================================
   額外樣式
   Additional Styles
   ======================================== */

/* ---------- 響應式設計額外樣式 ---------- */
@media (max-width: 768px) {
  :root {
    --header-row-height: 56px;
    --header-height: 112px;
  }

  /* 改善行動裝置字級大小 */
  html {
    font-size: 17px;
  }

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  p, li {
    font-size: 1rem;
    line-height: 1.75;
  }

  .article-summary,
  .hero-subtitle {
    font-size: 1.05rem;
    line-height: 1.7;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  /* 改善次要文字對比度 */
  .text-secondary,
  .article-card-summary,
  .faq-answer,
  .callout-content {
    color: var(--text-secondary);
  }

  /* 確保連結在行動裝置上可見 */
  a {
    color: var(--accent);
  }

  .main-nav {
    gap: var(--space-sm);
  }

  .main-nav > a {
    padding: 6px 8px;
    font-size: 0.85rem;
  }

  .nav-dropdown-toggle {
    padding: 6px 10px;
    font-size: 0.85rem;
  }

  .nav-dropdown-toggle .label-long {
    display: none;
  }

  .nav-dropdown-toggle .label-short {
    display: inline;
  }

  .dropdown-item {
    font-size: 0.85rem;
  }

  .header-actions {
    gap: 6px;
  }

  .header-icon-link {
    width: 30px;
    height: 30px;
    font-size: 0.85rem;
  }

  .header-menu-toggle {
    width: 40px;
    height: 40px;
  }

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

  .article-nav {
    flex-direction: column;
  }

  .article-nav a {
    max-width: 100%;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  /* 小螢幕字級優化 */
  html {
    font-size: 16px;
  }

  .article-title {
    font-size: 1.75rem;
    line-height: 1.3;
  }

  .article-meta {
    flex-direction: column;
    gap: var(--space-sm);
    font-size: 0.95rem;
  }

  /* 確保 meta 文字對比度足夠 */
  .article-meta-item {
    color: var(--text-secondary);
  }

  /* 隱藏次要標題 */
  .site-logo-subtitle {
    display: none;
  }

  /* 加大按鈕和連結的點擊區域 */
  .btn, .share-btn {
    padding: 14px 20px;
    min-height: 48px;
  }
}

/* ---------- 書籤功能樣式 ---------- */
.bookmark-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.bookmark-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.bookmark-btn.active {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--accent);
}

.bookmark-btn .bookmark-icon {
  font-size: 1rem;
}

.bookmark-btn.active .bookmark-icon {
  animation: bounce 0.5s ease;
}

/* 書籤列表 */
.bookmarks-panel {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: var(--space-md);
  margin-top: var(--space-md);
}

.bookmarks-panel h4 {
  margin: 0 0 var(--space-md) 0;
  color: var(--accent);
  font-size: 0.9rem;
}

.bookmarks-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.bookmarks-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--border);
}

.bookmarks-list li:last-child {
  border-bottom: none;
}

.bookmarks-list a {
  color: var(--text-primary);
  font-size: 0.9rem;
}

.bookmarks-list a:hover {
  color: var(--accent);
}

.bookmark-remove {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px 8px;
  font-size: 0.8rem;
  transition: color 0.2s ease;
}

.bookmark-remove:hover {
  color: #F44336;
}

.bookmarks-empty {
  color: var(--text-muted);
  font-size: 0.9rem;
  text-align: center;
  padding: var(--space-md);
}

/* ---------- 測驗功能樣式 ---------- */
.quiz-container {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: var(--space-lg);
  margin: var(--space-xl) 0;
}

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

.quiz-title {
  font-size: 1.25rem;
  color: var(--accent);
  margin: 0;
}

.quiz-progress {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.quiz-question {
  margin-bottom: var(--space-lg);
}

.quiz-question-text {
  font-size: 1.1rem;
  font-weight: 500;
  margin-bottom: var(--space-md);
  color: var(--text-primary);
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.quiz-option {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.quiz-option:hover {
  border-color: var(--accent);
  background: var(--bg-tertiary);
}

.quiz-option.selected {
  border-color: var(--accent);
  background: var(--accent-dim);
}

.quiz-option.correct {
  border-color: #4CAF50;
  background: rgba(76, 175, 80, 0.1);
}

.quiz-option.incorrect {
  border-color: #F44336;
  background: rgba(244, 67, 54, 0.1);
}

.quiz-option-marker {
  width: 24px;
  height: 24px;
  border: 2px solid var(--border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  color: var(--text-muted);
  transition: all 0.2s ease;
}

.quiz-option.selected .quiz-option-marker {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--bg-primary);
}

.quiz-option.correct .quiz-option-marker {
  border-color: #4CAF50;
  background: #4CAF50;
  color: white;
}

.quiz-option.incorrect .quiz-option-marker {
  border-color: #F44336;
  background: #F44336;
  color: white;
}

.quiz-feedback {
  padding: var(--space-md);
  border-radius: 8px;
  margin-top: var(--space-md);
  display: none;
}

.quiz-feedback.show {
  display: block;
  animation: fadeIn 0.3s ease;
}

.quiz-feedback.correct {
  background: rgba(76, 175, 80, 0.1);
  border: 1px solid #4CAF50;
  color: #4CAF50;
}

.quiz-feedback.incorrect {
  background: rgba(244, 67, 54, 0.1);
  border: 1px solid #F44336;
  color: #F44336;
}

.quiz-actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-md);
  margin-top: var(--space-lg);
  padding-top: var(--space-md);
  border-top: 1px solid var(--border);
}

.quiz-result {
  text-align: center;
  padding: var(--space-xl);
}

.quiz-result-score {
  font-size: 3rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: var(--space-md);
}

.quiz-result-text {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
}

/* ---------- 書籤面板樣式 ---------- */
.bookmarks-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  z-index: 9999;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 40px 20px;
  overflow-y: auto;
}

.bookmarks-panel {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  width: 100%;
  max-width: 500px;
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  animation: slideDown 0.3s ease;
}

.bookmarks-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-tertiary);
  border-radius: 12px 12px 0 0;
  position: sticky;
  top: 0;
}

.bookmarks-header h3 {
  margin: 0;
  font-size: 1.1rem;
  color: var(--text-primary);
}

.bookmarks-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px 8px;
  line-height: 1;
}

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

.bookmarks-stats {
  display: flex;
  gap: 16px;
  padding: 16px 20px;
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border);
}

.stat-item {
  flex: 1;
  text-align: center;
  padding: 12px;
  background: var(--bg-primary);
  border-radius: 8px;
}

.stat-value {
  display: block;
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--accent);
}

.stat-label {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.bookmarks-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.bookmarks-list li {
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--border);
  padding: 12px 20px;
}

.bookmarks-list li:last-child {
  border-bottom: none;
}

.bookmark-link {
  flex: 1;
  text-decoration: none;
  min-width: 0;
}

.bookmark-title {
  display: block;
  color: var(--text-primary);
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.bookmark-meta {
  display: flex;
  gap: 8px;
  margin-top: 4px;
  font-size: 0.75rem;
}

.bookmark-category {
  background: var(--accent-dim);
  color: var(--accent);
  padding: 2px 6px;
  border-radius: 4px;
}

.bookmark-date {
  color: var(--text-muted);
}

.bookmark-remove {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 4px 8px;
  margin-left: 8px;
}

.bookmark-remove:hover {
  color: #f44336;
}

.bookmarks-empty {
  padding: 40px 20px;
  text-align: center;
  color: var(--text-muted);
}

.bookmarks-empty p {
  margin: 0 0 8px 0;
}

.bookmarks-empty-tip {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* 書籤連結badge */
#bookmarks-link[data-count]:after {
  content: attr(data-count);
  position: absolute;
  top: 50%;
  right: 12px;
  transform: translateY(-50%);
  background: var(--accent);
  color: var(--bg-primary);
  font-size: 0.65rem;
  font-weight: 600;
  min-width: 16px;
  height: 16px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ---------- 互動範例降級樣式 ---------- */
.interactive-fallback {
  padding: 20px;
  text-align: center;
  background: var(--bg-tertiary);
  border-radius: 8px;
  color: var(--text-muted);
}

.interactive-fallback p {
  margin: 0 0 8px 0;
}

.interactive-fallback small {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* 增強的降級樣式 */
.interactive-fallback .fallback-icon {
  font-size: 2rem;
  margin-bottom: 10px;
}

.interactive-fallback .fallback-title {
  font-weight: 600;
  color: var(--text-primary);
}

.interactive-fallback .fallback-message {
  color: var(--accent);
}

.interactive-fallback .fallback-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.interactive-fallback .fallback-offline-hint {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.interactive-fallback .retry-btn {
  margin-top: 12px;
}

/* 錯誤類型特定樣式 */
.interactive-fallback-interactive-fallback-network {
  border-left: 3px solid var(--accent);
}

.interactive-fallback-interactive-fallback-timeout {
  border-left: 3px solid #f59e0b;
}

.interactive-fallback-interactive-fallback-type {
  border-left: 3px solid #ef4444;
}