/**
 * 学霸脑回路（MindFlow）— 暗色科技风样式
 * 设计关键词：黑科技、思维导图、硬核大脑
 */

/* ===== CSS变量 ===== */
:root {
  --bg-primary: #0F172A;
  --bg-secondary: #1E293B;
  --bg-tertiary: #334155;
  --text-primary: #F1F5F9;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  --accent-blue: #3B82F6;
  --accent-green: #10B981;
  --accent-orange: #F59E0B;
  --accent-purple: #8B5CF6;
  --accent-cyan: #06B6D4;
  --accent-red: #EF4444;
  --accent-gold: #FBBF24;
  --border-color: rgba(148, 163, 184, 0.15);
  --border-active: rgba(59, 130, 246, 0.5);
  --shadow-glow: 0 0 20px rgba(59, 130, 246, 0.15);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", "Consolas", monospace;
}

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

body {
  font-family: var(--font-sans);
  color: var(--text-primary);
  background: var(--bg-primary);
  line-height: 1.7;
  min-height: 100vh;
}

/* 背景网格效果 */
body::before {
  content: '';
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background-image:
    linear-gradient(rgba(59, 130, 246, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59, 130, 246, 0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

/* ===== 容器 ===== */
.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 24px 20px;
  position: relative;
  z-index: 1;
}

/* ===== Header ===== */
.header {
  text-align: center;
  padding: 40px 24px;
  background: linear-gradient(135deg, #1E293B 0%, #0F172A 100%);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  margin-bottom: 24px;
  position: relative;
  overflow: hidden;
}

.header::after {
  content: '';
  position: absolute;
  top: -50%; left: -50%;
  width: 200%; height: 200%;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.08) 0%, transparent 60%);
  animation: pulse-glow 4s ease-in-out infinite;
}

@keyframes pulse-glow {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 0.6; }
}

.header .logo {
  font-size: 32px;
  font-weight: 800;
  background: linear-gradient(135deg, #3B82F6, #8B5CF6, #06B6D4);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
  position: relative;
  z-index: 1;
}

.header .tagline {
  font-size: 14px;
  color: var(--text-secondary);
  position: relative;
  z-index: 1;
}

/* ===== 卡片 ===== */
.card {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  margin-bottom: 20px;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-card);
  transition: border-color 0.3s;
}

.card:hover {
  border-color: var(--border-active);
}

.card-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  flex-shrink: 0;
}

.card-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
}

.card-subtitle {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 2px;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius);
  border: none;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
  font-family: var(--font-sans);
}

.btn-primary {
  background: linear-gradient(135deg, #3B82F6, #2563EB);
  color: #fff;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(59, 130, 246, 0.4);
}

.btn-accent {
  background: linear-gradient(135deg, #10B981, #059669);
  color: #fff;
}

.btn-accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(16, 185, 129, 0.4);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

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

.btn-warning {
  background: linear-gradient(135deg, #F59E0B, #D97706);
  color: #fff;
}

.btn-warning:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(245, 158, 11, 0.4);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 13px;
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none !important;
}

/* ===== 进度条 ===== */
.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--bg-tertiary);
  border-radius: 999px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #3B82F6, #8B5CF6);
  border-radius: 999px;
  transition: width 0.5s ease;
}

/* ===== 单词展示 ===== */
.word-display {
  text-align: center;
  margin-bottom: 24px;
}

.word-text {
  font-size: 36px;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: 1px;
}

.word-pronunciation {
  font-size: 16px;
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  margin-top: 4px;
}

.word-meaning {
  font-size: 18px;
  color: var(--accent-green);
  font-weight: 600;
  margin-top: 8px;
}

.word-pos {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* ===== 音节块 ===== */
.syllable-container {
  display: flex;
  justify-content: center;
  gap: 6px;
  flex-wrap: wrap;
  margin: 20px 0;
}

.syllable-block {
  padding: 12px 16px;
  border-radius: var(--radius);
  font-size: 20px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.3s;
  position: relative;
  border: 2px solid transparent;
}

.syllable-block:hover {
  transform: translateY(-4px);
  border-color: currentColor;
}

.syllable-phonetic {
  font-size: 12px;
  font-family: var(--font-mono);
  opacity: 0.7;
  margin-top: 4px;
  text-align: center;
}

.syllable-rule {
  font-size: 11px;
  color: var(--text-secondary);
  text-align: center;
  margin-top: 2px;
}

/* ===== 词根积木 ===== */
.morphology-container {
  display: flex;
  justify-content: center;
  gap: 4px;
  margin: 20px 0;
  flex-wrap: wrap;
}

.morph-block {
  padding: 16px 20px;
  border-radius: var(--radius);
  text-align: center;
  cursor: pointer;
  transition: all 0.3s;
  min-width: 80px;
}

.morph-block:hover {
  transform: scale(1.05);
}

.morph-prefix {
  background: rgba(59, 130, 246, 0.15);
  border: 2px solid var(--accent-blue);
  color: var(--accent-blue);
}

.morph-root {
  background: rgba(16, 185, 129, 0.15);
  border: 2px solid var(--accent-green);
  color: var(--accent-green);
}

.morph-suffix {
  background: rgba(245, 158, 11, 0.15);
  border: 2px solid var(--accent-orange);
  color: var(--accent-orange);
}

.morph-text {
  font-size: 22px;
  font-weight: 800;
  font-family: var(--font-mono);
}

.morph-meaning {
  font-size: 12px;
  margin-top: 4px;
  opacity: 0.8;
}

.morph-origin {
  font-size: 10px;
  opacity: 0.5;
  margin-top: 2px;
}

/* ===== 词根树 ===== */
.root-tree-container {
  background: var(--bg-primary);
  border-radius: var(--radius);
  padding: 24px;
  margin: 16px 0;
  border: 1px solid var(--border-color);
}

.root-tree-svg {
  width: 100%;
  height: auto;
}

.root-node {
  cursor: pointer;
  transition: all 0.3s;
}

.root-node:hover {
  filter: brightness(1.3);
}

/* ===== 挖空输入 ===== */
.blank-input-container {
  display: flex;
  justify-content: center;
  gap: 4px;
  margin: 16px 0;
  flex-wrap: wrap;
}

.letter-slot {
  width: 44px;
  height: 52px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-primary);
  background: var(--bg-primary);
  transition: all 0.3s;
}

.letter-slot:focus {
  outline: none;
  border-color: var(--accent-blue);
  box-shadow: 0 0 12px rgba(59, 130, 246, 0.3);
}

.letter-slot.correct {
  border-color: var(--accent-green);
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-green);
}

.letter-slot.incorrect {
  border-color: var(--accent-red);
  background: rgba(239, 68, 68, 0.15);
  color: var(--accent-red);
  animation: shake 0.3s;
}

.letter-slot.hint {
  border-color: var(--accent-purple);
  background: rgba(139, 92, 246, 0.15);
  color: var(--accent-purple);
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-4px); }
  75% { transform: translateX(4px); }
}

@keyframes slotPulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.2); }
  100% { transform: scale(1); }
}

.letter-slot.pulse {
  animation: slotPulse 0.3s ease;
}

/* ===== 键盘 ===== */
.keyboard {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
  margin: 20px 0;
}

.key-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  font-family: var(--font-sans);
}

.key-btn:hover:not(:disabled) {
  background: var(--bg-secondary);
  border-color: var(--accent-blue);
  transform: translateY(-2px);
}

.key-btn.correct {
  background: var(--accent-green);
  color: #fff;
  border-color: var(--accent-green);
}

.key-btn.wrong {
  background: var(--accent-red);
  color: #fff;
  border-color: var(--accent-red);
}

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

/* ===== 诊断卡片 ===== */
.diagnosis-card {
  background: linear-gradient(135deg, rgba(239, 68, 68, 0.1), rgba(239, 68, 68, 0.05));
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: var(--radius);
  padding: 20px;
  margin: 16px 0;
}

.diagnosis-card.success {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(16, 185, 129, 0.05));
  border-color: rgba(16, 185, 129, 0.3);
}

.diagnosis-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}

.diagnosis-type {
  font-size: 13px;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 999px;
  background: rgba(239, 68, 68, 0.2);
  color: var(--accent-red);
}

.diagnosis-card.success .diagnosis-type {
  background: rgba(16, 185, 129, 0.2);
  color: var(--accent-green);
}

.diagnosis-text {
  font-size: 15px;
  color: var(--text-primary);
  line-height: 1.6;
  margin-bottom: 8px;
}

.diagnosis-suggestion {
  font-size: 14px;
  color: var(--accent-cyan);
  display: flex;
  align-items: flex-start;
  gap: 6px;
}

/* ===== 勋章 ===== */
.badge-container {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
  margin: 16px 0;
}

.badge-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 12px 16px;
  border-radius: var(--radius);
  background: var(--bg-tertiary);
  border: 2px solid var(--border-color);
  transition: all 0.3s;
  min-width: 80px;
}

.badge-item.unlocked {
  border-color: var(--accent-gold);
  background: rgba(251, 191, 36, 0.1);
  box-shadow: 0 0 16px rgba(251, 191, 36, 0.2);
}

.badge-item.locked {
  opacity: 0.4;
}

.badge-icon {
  font-size: 28px;
}

.badge-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
}

.badge-progress {
  font-size: 11px;
  color: var(--text-secondary);
}

.badge-item.unlocked .badge-progress {
  color: var(--accent-gold);
}

/* ===== 跑团剧情 ===== */
.rpg-story-text {
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-primary);
  white-space: pre-line;
  margin-bottom: 16px;
}

.rpg-blank-text {
  font-size: 18px;
  line-height: 1.8;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.rpg-blank {
  display: inline-block;
  min-width: 120px;
  border-bottom: 2px solid var(--accent-blue);
  text-align: center;
  color: var(--accent-blue);
  font-weight: 700;
}

.rpg-input {
  width: 100%;
  padding: 14px 16px;
  border-radius: var(--radius);
  border: 2px solid var(--border-color);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 18px;
  font-family: var(--font-sans);
  outline: none;
  transition: border-color 0.2s;
}

.rpg-input:focus {
  border-color: var(--accent-blue);
}

/* ===== 搭配高亮 ===== */
.collocation-card {
  background: var(--bg-tertiary);
  border-radius: var(--radius);
  padding: 16px;
  margin: 8px 0;
  border-left: 4px solid var(--accent-purple);
}

.collocation-phrase {
  font-size: 16px;
  font-weight: 700;
  color: var(--accent-purple);
}

.collocation-highlight {
  animation: highlight-pulse 2s ease-in-out infinite;
}

@keyframes highlight-pulse {
  0%, 100% { background: rgba(139, 92, 246, 0.1); }
  50% { background: rgba(139, 92, 246, 0.3); }
}

.collocation-meaning {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 4px;
}

.collocation-example {
  font-size: 14px;
  color: var(--text-secondary);
  margin-top: 8px;
  font-style: italic;
}

/* ===== 统计网格 ===== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.stat-item {
  background: var(--bg-tertiary);
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
}

.stat-value {
  font-size: 28px;
  font-weight: 800;
  color: var(--accent-blue);
  font-family: var(--font-mono);
}

.stat-label {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* ===== 标签 ===== */
.word-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 8px 0;
}

.word-tag {
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
}

.word-tag.brand {
  background: rgba(59, 130, 246, 0.15);
  color: var(--accent-blue);
}

.word-tag.accent {
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-green);
}

.word-tag.warning {
  background: rgba(245, 158, 11, 0.15);
  color: var(--accent-orange);
}

.word-tag.knowledge {
  background: rgba(139, 92, 246, 0.15);
  color: var(--accent-purple);
}

/* ===== 返回链接 ===== */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s;
}

.back-link:hover {
  color: var(--accent-blue);
}

/* ===== 顶部状态栏 ===== */
.top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.top-stats {
  display: flex;
  gap: 16px;
}

.top-stat {
  text-align: center;
}

.top-stat-value {
  font-size: 20px;
  font-weight: 700;
  font-family: var(--font-mono);
}

.top-stat-label {
  font-size: 11px;
  color: var(--text-secondary);
}

/* ===== 高亮文本 ===== */
.highlight-word {
  color: var(--accent-blue);
  font-weight: 700;
  border-bottom: 2px dashed var(--accent-blue);
  padding: 0 4px;
}

.highlight-clue {
  background: rgba(245, 158, 11, 0.2);
  color: var(--accent-orange);
  font-weight: 600;
  padding: 2px 6px;
  border-radius: 4px;
}

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

.fade-in {
  animation: fadeIn 0.4s ease;
}

@keyframes slideIn {
  from { opacity: 0; transform: translateX(-20px); }
  to { opacity: 1; transform: translateX(0); }
}

.slide-in {
  animation: slideIn 0.3s ease;
}

/* ===== 配音区域 ===== */
.dubbing-scene {
  background: var(--bg-primary);
  border-radius: var(--radius);
  padding: 24px;
  margin: 16px 0;
  border: 1px solid var(--border-color);
  text-align: center;
}

.dubbing-movie {
  font-size: 14px;
  color: var(--accent-purple);
  font-weight: 600;
  margin-bottom: 4px;
}

.dubbing-scene-name {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.dubbing-context {
  font-size: 20px;
  line-height: 1.8;
  color: var(--text-primary);
  margin-bottom: 16px;
  font-style: italic;
}

.dubbing-translation {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.dubbing-controls {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin: 20px 0;
}

/* ===== 录音按钮 ===== */
.record-btn {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  border: none;
  background: linear-gradient(135deg, #EF4444, #DC2626);
  color: #fff;
  font-size: 24px;
  cursor: pointer;
  transition: all 0.3s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.record-btn:hover {
  transform: scale(1.1);
  box-shadow: 0 0 24px rgba(239, 68, 68, 0.4);
}

.record-btn.recording {
  animation: record-pulse 1.5s ease-in-out infinite;
}

@keyframes record-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.4); }
  50% { box-shadow: 0 0 0 12px rgba(239, 68, 68, 0); }
}

/* ===== 提示文字 ===== */
.hint-text {
  font-size: 14px;
  color: var(--text-secondary);
  text-align: center;
  margin: 12px 0;
}

.section-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 20px 0 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.section-title .icon {
  font-size: 20px;
}

/* ===== 分隔线 ===== */
.divider {
  height: 1px;
  background: var(--border-color);
  margin: 20px 0;
}

/* ===== 响应式 ===== */
/* ===== 全局导航栏 ===== */
.nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-secondary);
  border-radius: var(--radius);
  padding: 12px 20px;
  margin-bottom: 20px;
  border: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.nav-brand {
  font-size: 16px;
  font-weight: 800;
  background: linear-gradient(135deg, #3B82F6, #8B5CF6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-decoration: none;
  white-space: nowrap;
}

.nav-links {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

.nav-link {
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  transition: all 0.2s;
  white-space: nowrap;
}

.nav-link:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.nav-link.active {
  background: rgba(59, 130, 246, 0.15);
  color: var(--accent-blue);
}

.nav-link.placeholder {
  opacity: 0.4;
  cursor: not-allowed;
  position: relative;
}

.nav-link.placeholder::after {
  content: '即将上线';
  position: absolute;
  top: -8px;
  right: -4px;
  font-size: 8px;
  background: var(--accent-orange);
  color: #fff;
  padding: 1px 4px;
  border-radius: 999px;
  white-space: nowrap;
}

/* ===== 字母级高亮诊断 ===== */
.letter-result {
  display: inline-flex;
  gap: 3px;
  justify-content: center;
  margin: 12px 0;
  flex-wrap: wrap;
}

.letter-char {
  width: 36px;
  height: 44px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 700;
  font-family: var(--font-mono);
  border: 2px solid var(--border-color);
  background: var(--bg-primary);
  transition: all 0.3s;
}

.letter-char.match {
  border-color: var(--accent-green);
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-green);
}

.letter-char.mismatch {
  border-color: var(--accent-red);
  background: rgba(239, 68, 68, 0.2);
  color: var(--accent-red);
  animation: shake 0.3s;
}

.letter-char.extra {
  border-color: var(--accent-orange);
  background: rgba(245, 158, 11, 0.15);
  color: var(--accent-orange);
  border-style: dashed;
}

.letter-char.missing {
  border-color: var(--accent-red);
  background: rgba(239, 68, 68, 0.1);
  color: var(--accent-red);
  border-style: dashed;
  opacity: 0.6;
}

.letter-char.missing::after {
  content: attr(data-letter);
  position: absolute;
  font-size: 14px;
  opacity: 0.5;
}

/* 跨模块引流提示 */
.cross-module-tip {
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.1), rgba(59, 130, 246, 0.05));
  border: 1px solid rgba(139, 92, 246, 0.3);
  border-radius: var(--radius);
  padding: 14px 18px;
  margin-top: 12px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.cross-module-tip .tip-icon {
  font-size: 24px;
  flex-shrink: 0;
}

.cross-module-tip .tip-content {
  flex: 1;
  font-size: 14px;
  color: var(--text-primary);
}

.cross-module-tip .tip-link {
  color: var(--accent-purple);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px dashed var(--accent-purple);
}

.cross-module-tip .tip-link:hover {
  opacity: 0.8;
}

/* ===== RPG分支剧情 ===== */
.rpg-branch-story {
  background: var(--bg-primary);
  border-radius: var(--radius);
  padding: 16px 20px;
  margin: 12px 0;
  border-left: 4px solid var(--accent-green);
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-primary);
  white-space: pre-line;
}

.rpg-branch-story.fail {
  border-left-color: var(--accent-red);
}

.rpg-difficulty-hint {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 12px;
}

.rpg-difficulty-easy {
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-green);
}

.rpg-difficulty-medium {
  background: rgba(245, 158, 11, 0.15);
  color: var(--accent-orange);
}

.rpg-difficulty-hard {
  background: rgba(239, 68, 68, 0.15);
  color: var(--accent-red);
}

.rpg-hint-box {
  background: rgba(139, 92, 246, 0.08);
  border: 1px solid rgba(139, 92, 246, 0.2);
  border-radius: var(--radius);
  padding: 12px 16px;
  margin: 12px 0;
  font-size: 14px;
  color: var(--text-secondary);
}

.rpg-hint-box .hint-label {
  color: var(--accent-purple);
  font-weight: 600;
  margin-right: 6px;
}

/* ===== 学霸引导答题 ===== */
.guide-step {
  background: var(--bg-tertiary);
  border-radius: var(--radius);
  padding: 16px 20px;
  margin: 12px 0;
  border-left: 4px solid var(--accent-blue);
  transition: all 0.3s;
}

.guide-step.current {
  border-left-color: var(--accent-gold);
  background: rgba(251, 191, 36, 0.08);
}

.guide-step.completed {
  border-left-color: var(--accent-green);
  opacity: 0.7;
}

.guide-step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--accent-blue);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  margin-right: 8px;
}

.guide-step.completed .guide-step-num {
  background: var(--accent-green);
}

.guide-step.current .guide-step-num {
  background: var(--accent-gold);
}

.guide-step-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.guide-step-content {
  font-size: 14px;
  color: var(--text-secondary);
}

.guide-step-input {
  width: 100%;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  border: 2px solid var(--border-color);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 16px;
  margin-top: 8px;
  outline: none;
  transition: border-color 0.2s;
}

.guide-step-input:focus {
  border-color: var(--accent-blue);
}

.guide-options {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 8px;
}

.guide-option {
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s;
}

.guide-option:hover {
  border-color: var(--accent-blue);
  background: rgba(59, 130, 246, 0.1);
}

.guide-option.selected {
  background: rgba(59, 130, 246, 0.2);
  border-color: var(--accent-blue);
  color: var(--accent-blue);
}

/* ===== 配音字幕高亮 ===== */
.dubbing-subtitle {
  font-size: 20px;
  line-height: 2;
  color: var(--text-primary);
  text-align: center;
  margin: 16px 0;
  min-height: 60px;
}

.dubbing-subtitle .subtitle-word {
  display: inline-block;
  padding: 2px 6px;
  border-radius: 4px;
  transition: all 0.3s;
}

.dubbing-subtitle .subtitle-word.active {
  background: rgba(239, 68, 68, 0.2);
  color: var(--accent-red);
  font-weight: 700;
  transform: scale(1.1);
}

.dubbing-subtitle .subtitle-word.muted {
  opacity: 0.3;
  text-decoration: line-through;
}

.dubbing-mute-indicator {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 999px;
  background: rgba(239, 68, 68, 0.15);
  color: var(--accent-red);
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 12px;
  animation: pulse-glow 2s ease-in-out infinite;
}

/* ===== 词根图谱搜索 ===== */
.root-search-box {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
}

.root-search-input {
  flex: 1;
  padding: 12px 16px;
  border-radius: var(--radius);
  border: 2px solid var(--border-color);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 15px;
  outline: none;
  transition: border-color 0.2s;
}

.root-search-input:focus {
  border-color: var(--accent-green);
}

.root-search-input::placeholder {
  color: var(--text-muted);
}

/* ===== 响应式 ===== */
@media (max-width: 600px) {
  .container { padding: 16px 12px; }
  .header { padding: 28px 16px; }
  .header .logo { font-size: 26px; }
  .card { padding: 20px 16px; }
  .word-text { font-size: 28px; }
  .syllable-block { padding: 8px 12px; font-size: 18px; }
  .morph-block { padding: 12px 16px; min-width: 60px; }
  .morph-text { font-size: 18px; }
  .letter-slot { width: 36px; height: 44px; font-size: 20px; }
  .key-btn { width: 32px; height: 36px; font-size: 14px; }
  .stats-grid { grid-template-columns: 1fr; }
  .rpg-blank-text { font-size: 16px; }
  .dubbing-context { font-size: 18px; }
  .nav-bar { flex-direction: column; gap: 8px; padding: 10px 12px; }
  .nav-links { justify-content: center; }
  .nav-link { font-size: 12px; padding: 4px 8px; }
  .letter-char { width: 28px; height: 36px; font-size: 16px; }
  .guide-step { padding: 12px 14px; }
  .dubbing-subtitle { font-size: 18px; }
}