/* Ogden Basic English 学习网站 - 样式表 */

:root {
  --primary: #4f46e5;
  --primary-light: #e0e7ff;
  --primary-dark: #3730a3;
  --accent: #f59e0b;
  --accent-light: #fef3c7;
  --success: #10b981;
  --success-light: #d1fae5;
  --danger: #ef4444;
  --danger-light: #fee2e2;
  --text: #1f2937;
  --text-muted: #6b7280;
  --text-light: #9ca3af;
  --bg: #ffffff;
  --bg-soft: #f9fafb;
  --bg-gray: #f3f4f6;
  --border: #e5e7eb;
  --border-dark: #d1d5db;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.1), 0 4px 6px rgba(0,0,0,0.05);
  --radius: 10px;
  --radius-sm: 6px;
  --radius-lg: 16px;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'Courier New', monospace;

  /* 分类色 */
  --ops-color: #6366f1;
  --ops-bg: #eef2ff;
  --gen-color: #10b981;
  --gen-bg: #d1fae5;
  --pic-color: #f59e0b;
  --pic-bg: #fef3c7;
  --qual-color: #3b82f6;
  --qual-bg: #dbeafe;
  --opp-color: #ec4899;
  --opp-bg: #fce7f3;
}

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

body {
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ====== 导航栏 ====== */
.nav {
  position: sticky;
  top: 0;
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  padding: 0 24px;
}
.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 8px;
  height: 56px;
}
.nav-logo {
  font-size: 17px;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
  margin-right: 16px;
  white-space: nowrap;
}
.nav-links {
  display: flex;
  gap: 4px;
  flex: 1;
  overflow-x: auto;
  scrollbar-width: none;
}
.nav-links::-webkit-scrollbar { display: none; }
.nav-link {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  transition: all 0.15s;
}
.nav-link:hover { color: var(--primary); background: var(--primary-light); }
.nav-link.active { color: var(--primary); background: var(--primary-light); }

/* ====== 页面容器 ====== */
.page-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 32px 24px 64px;
}

/* ====== 首页 Hero ====== */
.hero {
  text-align: center;
  padding: 64px 24px 48px;
  background: linear-gradient(135deg, #eef2ff 0%, #fef3c7 100%);
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: white;
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 4px 14px;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 20px;
}
.hero h1 {
  font-size: 44px;
  font-weight: 800;
  line-height: 1.15;
  color: var(--text);
  margin-bottom: 16px;
}
.hero h1 span { color: var(--primary); }
.hero-sub {
  font-size: 18px;
  color: var(--text-muted);
  max-width: 520px;
  margin: 0 auto 32px;
}
.hero-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 22px;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all 0.2s;
  text-decoration: none;
}
.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn-outline { background: white; color: var(--primary); border: 2px solid var(--primary); }
.btn-outline:hover { background: var(--primary-light); }
.btn-sm { padding: 6px 14px; font-size: 13px; }
.btn-success { background: var(--success); color: white; }
.btn-success:hover { background: #059669; }
.btn-danger { background: var(--danger); color: white; }
.btn-gray { background: var(--bg-gray); color: var(--text); border: 1px solid var(--border); }
.btn-gray:hover { background: var(--border); }

/* ====== 统计条 ====== */
.stats-bar {
  display: flex;
  justify-content: center;
  gap: 0;
  background: white;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.stat-item {
  flex: 1;
  max-width: 200px;
  text-align: center;
  padding: 20px 16px;
  border-right: 1px solid var(--border);
}
.stat-item:last-child { border-right: none; }
.stat-value { font-size: 28px; font-weight: 800; color: var(--primary); }
.stat-label { font-size: 13px; color: var(--text-muted); margin-top: 2px; }

/* ====== 分类标签 ====== */
.cat-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}
.cat-tab {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  border-radius: 20px;
  border: 1.5px solid var(--border);
  background: white;
  font-size: 13.5px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
  color: var(--text-muted);
}
.cat-tab:hover { border-color: var(--primary); color: var(--primary); }
.cat-tab.active { background: var(--primary); border-color: var(--primary); color: white; }
.cat-tab .count { font-size: 11px; opacity: 0.7; }

.cat-tab[data-cat="operations"].active { background: var(--ops-color); border-color: var(--ops-color); }
.cat-tab[data-cat="things_picturable"].active { background: var(--pic-color); border-color: var(--pic-color); }
.cat-tab[data-cat="things_general"].active { background: var(--gen-color); border-color: var(--gen-color); }
.cat-tab[data-cat="qualities"].active { background: var(--qual-color); border-color: var(--qual-color); }
.cat-tab[data-cat="opposites"].active { background: var(--opp-color); border-color: var(--opp-color); }

/* ====== 词汇卡片网格 ====== */
.word-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
}
.word-card {
  background: white;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  cursor: pointer;
  transition: all 0.15s;
  text-align: left;
}
.word-card:hover { border-color: var(--primary); box-shadow: var(--shadow-md); transform: translateY(-1px); }
.word-card.mastered { border-color: var(--success); background: var(--success-light); }
.word-main { font-size: 20px; font-weight: 700; color: var(--text); margin-bottom: 4px; }
.word-phonetic { font-size: 12px; color: var(--text-light); font-family: var(--font-mono); margin-bottom: 6px; }
.word-meaning { font-size: 13px; color: var(--text-muted); }
.word-cat-badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 11px;
  font-weight: 500;
  margin-top: 8px;
}
.badge-operations { background: var(--ops-bg); color: var(--ops-color); }
.badge-things_picturable { background: var(--pic-bg); color: var(--pic-color); }
.badge-things_general { background: var(--gen-bg); color: var(--gen-color); }
.badge-qualities { background: var(--qual-bg); color: var(--qual-color); }
.badge-opposites { background: var(--opp-bg); color: var(--opp-color); }
.badge-basics { background: #f0fdf4; color: #15803d; }

/* ====== 搜索框 ====== */
.search-wrap {
  position: relative;
  margin-bottom: 20px;
}
.search-input {
  width: 100%;
  padding: 10px 16px 10px 40px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  font-size: 15px;
  font-family: var(--font);
  outline: none;
  transition: border-color 0.15s;
  background: white;
}
.search-input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(79,70,229,0.1); }
.search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-light);
  pointer-events: none;
}

/* ====== 闪卡 ====== */
.flashcard-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 32px 0;
}
.flashcard-progress {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
  font-size: 14px;
  color: var(--text-muted);
}
.progress-bar {
  width: 200px;
  height: 6px;
  background: var(--bg-gray);
  border-radius: 3px;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  background: var(--primary);
  border-radius: 3px;
  transition: width 0.3s;
}
.flashcard {
  width: 100%;
  max-width: 520px;
  min-height: 300px;
  perspective: 1000px;
  cursor: pointer;
  margin-bottom: 24px;
}
.flashcard-inner {
  position: relative;
  width: 100%;
  min-height: 300px;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  transform-style: preserve-3d;
}
.flashcard.flipped .flashcard-inner { transform: rotateY(180deg); }
.flashcard-front, .flashcard-back {
  position: absolute;
  width: 100%;
  min-height: 300px;
  backface-visibility: hidden;
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.flashcard-front {
  background: white;
  border: 2px solid var(--border);
  box-shadow: var(--shadow-lg);
}
.flashcard-back {
  background: linear-gradient(135deg, var(--primary) 0%, #7c3aed 100%);
  color: white;
  transform: rotateY(180deg);
  box-shadow: var(--shadow-lg);
}
.flashcard-word {
  font-size: 52px;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 8px;
  letter-spacing: -1px;
}
.flashcard-phonetic {
  font-size: 18px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  margin-bottom: 12px;
}
.flashcard-cat {
  font-size: 13px;
  padding: 4px 12px;
  border-radius: 12px;
  background: var(--bg-gray);
  color: var(--text-muted);
  margin-bottom: 16px;
}
.flashcard-hint {
  font-size: 13px;
  color: var(--text-light);
  display: flex;
  align-items: center;
  gap: 4px;
}
.flashcard-meaning {
  font-size: 28px;
  font-weight: 700;
  color: white;
  text-align: center;
  margin-bottom: 16px;
}
.flashcard-example {
  font-size: 16px;
  color: rgba(255,255,255,0.85);
  text-align: center;
  font-style: italic;
  margin-bottom: 8px;
}
.flashcard-example-cn {
  font-size: 14px;
  color: rgba(255,255,255,0.65);
  text-align: center;
}
.flashcard-controls {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-top: 8px;
}
.flashcard-nav-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1.5px solid var(--border);
  background: white;
  cursor: pointer;
  font-size: 18px;
  transition: all 0.15s;
  color: var(--text-muted);
}
.flashcard-nav-btn:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-light); }
.keyboard-hint {
  display: flex;
  gap: 12px;
  font-size: 12px;
  color: var(--text-light);
  margin-top: 16px;
}
.key-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  background: var(--bg-gray);
  border-radius: 4px;
  border: 1px solid var(--border-dark);
  font-size: 12px;
}

/* ====== 单词详情弹窗 ====== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  transition: opacity 0.2s;
}
.modal-overlay.show { opacity: 1; }
.modal {
  background: white;
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 540px;
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  transform: scale(0.95);
  transition: transform 0.2s;
}
.modal-overlay.show .modal { transform: scale(1); }
.modal-header {
  padding: 24px 24px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}
.modal-title { font-size: 32px; font-weight: 800; color: var(--text); }
.modal-phonetic { font-size: 16px; color: var(--text-muted); font-family: var(--font-mono); margin-top: 2px; }
.modal-close {
  width: 32px; height: 32px;
  border-radius: 8px;
  border: 1.5px solid var(--border);
  background: white;
  cursor: pointer;
  font-size: 16px;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.15s;
  flex-shrink: 0;
}
.modal-close:hover { background: var(--bg-gray); }
.modal-body { padding: 20px 24px 24px; }
.modal-section { margin-bottom: 20px; }
.modal-section:last-child { margin-bottom: 0; }
.section-label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-light);
  margin-bottom: 8px;
}
.modal-meaning {
  font-size: 20px;
  font-weight: 600;
  color: var(--text);
}
.modal-note {
  font-size: 14px;
  color: var(--text-muted);
  background: var(--bg-soft);
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--accent);
  line-height: 1.5;
}
.sentence-list { display: flex; flex-direction: column; gap: 10px; }
.sentence-item {
  background: var(--bg-soft);
  border-radius: var(--radius-sm);
  padding: 12px;
  border-left: 3px solid var(--primary);
}
.sentence-en { font-size: 15px; font-weight: 500; color: var(--text); margin-bottom: 3px; }
.sentence-cn { font-size: 13px; color: var(--text-muted); }
.combos-list { display: flex; flex-wrap: wrap; gap: 8px; }
.combo-tag {
  padding: 4px 10px;
  background: var(--primary-light);
  color: var(--primary-dark);
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
}
.modal-actions {
  display: flex;
  gap: 10px;
  margin-top: 16px;
}

/* ====== 造句练习 ====== */
.pattern-list { display: flex; flex-direction: column; gap: 16px; }
.pattern-card {
  background: white;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  cursor: pointer;
  transition: all 0.15s;
}
.pattern-card:hover { border-color: var(--primary); box-shadow: var(--shadow-md); }
.pattern-title { font-size: 16px; font-weight: 700; color: var(--text); margin-bottom: 4px; }
.pattern-title-cn { font-size: 13px; color: var(--text-muted); margin-bottom: 12px; }
.pattern-examples { display: flex; flex-direction: column; gap: 6px; }
.pattern-ex-item { font-size: 14px; color: var(--text-muted); padding-left: 12px; border-left: 2px solid var(--accent); }
.pattern-template {
  margin-top: 12px;
  padding: 8px 12px;
  background: var(--bg-soft);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--primary);
}
.practice-area {
  background: white;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-top: 24px;
}
.practice-prompt { font-size: 16px; font-weight: 600; margin-bottom: 12px; }
.practice-input {
  width: 100%;
  padding: 12px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-family: var(--font);
  outline: none;
  resize: vertical;
  min-height: 80px;
  transition: border-color 0.15s;
}
.practice-input:focus { border-color: var(--primary); }
.practice-tip { font-size: 13px; color: var(--text-muted); margin-top: 8px; }

/* ====== 操作词专区 ====== */
.operators-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}
.operator-card {
  background: white;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.operator-header {
  padding: 16px 20px;
  background: linear-gradient(135deg, var(--primary) 0%, #7c3aed 100%);
  display: flex;
  align-items: center;
  gap: 12px;
}
.operator-word { font-size: 24px; font-weight: 800; color: white; }
.operator-phonetic { font-size: 13px; color: rgba(255,255,255,0.7); font-family: var(--font-mono); }
.operator-meaning { font-size: 14px; color: rgba(255,255,255,0.9); margin-left: auto; font-weight: 600; }
.operator-body { padding: 16px 20px; }
.operator-note {
  font-size: 13px;
  color: var(--text-muted);
  background: var(--bg-soft);
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  border-left: 3px solid var(--accent);
}
.combos-mini { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 12px; }
.combo-mini-tag {
  padding: 3px 8px;
  background: var(--primary-light);
  color: var(--primary-dark);
  border-radius: 4px;
  font-size: 12px;
  font-weight: 500;
}
.op-sentences { display: flex; flex-direction: column; gap: 6px; }
.op-sentence {
  font-size: 13px;
  color: var(--text-muted);
  padding-left: 10px;
  border-left: 2px solid var(--border-dark);
}
.op-sentence strong { color: var(--text); }

/* ====== 进度页 ====== */
.progress-stats {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 16px;
  margin-bottom: 32px;
}
.progress-stat-card {
  background: white;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
}
.progress-stat-value { font-size: 36px; font-weight: 800; color: var(--primary); }
.progress-stat-label { font-size: 13px; color: var(--text-muted); margin-top: 4px; }
.mastered-list { display: flex; flex-wrap: wrap; gap: 8px; }
.mastered-tag {
  padding: 5px 12px;
  background: var(--success-light);
  color: #065f46;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 600;
}

/* ====== 功能模块卡片 ====== */
.module-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
  padding: 32px 24px;
  max-width: 1100px;
  margin: 0 auto;
}
.module-card {
  background: white;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  text-decoration: none;
  transition: all 0.2s;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.module-card:hover { border-color: var(--primary); box-shadow: var(--shadow-lg); transform: translateY(-2px); }
.module-icon { font-size: 32px; }
.module-title { font-size: 18px; font-weight: 700; color: var(--text); }
.module-desc { font-size: 14px; color: var(--text-muted); line-height: 1.5; }
.module-badge {
  display: inline-block;
  padding: 3px 10px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 10px;
  font-size: 12px;
  font-weight: 600;
  margin-top: 4px;
  width: fit-content;
}

/* ====== 分隔线 ====== */
.divider {
  height: 1px;
  background: var(--border);
  margin: 32px 0;
}

/* ====== 空状态 ====== */
.empty-state {
  text-align: center;
  padding: 48px 24px;
  color: var(--text-muted);
}
.empty-state-icon { font-size: 48px; margin-bottom: 16px; }
.empty-state p { font-size: 16px; }

/* ====== 颜色指示器 ====== */
.ops-dot { color: var(--ops-color); }
.gen-dot { color: var(--gen-color); }
.pic-dot { color: var(--pic-color); }
.qual-dot { color: var(--qual-color); }
.opp-dot { color: var(--opp-color); }

/* ====== 响应式 ====== */
@media (max-width: 640px) {
  .hero h1 { font-size: 32px; }
  .hero-sub { font-size: 15px; }
  .stats-bar { flex-wrap: wrap; }
  .stat-item { flex: 1 0 40%; border-bottom: 1px solid var(--border); }
  .word-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }
  .operators-grid { grid-template-columns: 1fr; }
  .flashcard-word { font-size: 40px; }
  .nav-logo { font-size: 15px; }
  .page-container { padding: 20px 16px 48px; }
  .module-grid { grid-template-columns: 1fr; padding: 24px 16px; }
}

/* ====== 工具类 ====== */
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.font-bold { font-weight: 700; }
.mt-4 { margin-top: 16px; }
.mt-6 { margin-top: 24px; }
.mt-8 { margin-top: 32px; }
.mb-4 { margin-bottom: 16px; }
.mb-6 { margin-bottom: 24px; }
.flex { display: flex; }
.items-center { align-items: center; }
.gap-2 { gap: 8px; }
.gap-3 { gap: 12px; }
.hidden { display: none !important; }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ====== 动画 ====== */
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }
.fade-in { animation: fadeIn 0.25s ease both; }

/* ====== 音频按钮 ====== */
.speak-btn {
  background: none;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 6px 12px;
  cursor: pointer;
  font-size: 16px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: all 0.15px;
  color: var(--text-muted);
}
.speak-btn:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-light); }

/* ====== 标题区域 ====== */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}
.section-title { font-size: 22px; font-weight: 800; color: var(--text); }
.section-subtitle { font-size: 14px; color: var(--text-muted); margin-top: 2px; }