/* ==========================================================================
   同余探索（Modulo Explorer）组件系统样式
   ========================================================================== */

/* 渐入动效 */
.block-fade-in {
  animation: fadeInBlock 0.45s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes fadeInBlock {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 1. 对话气泡块 (Dialogue Block) */
.dialogue-wrapper {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin: 10px 0;
}

.dialogue-bubble-row {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.dialogue-bubble-row.sister {
  flex-direction: row;
}

.dialogue-bubble-row.younger {
  flex-direction: row-reverse;
}

.avatar-badge {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.95rem;
  flex-shrink: 0;
  box-shadow: var(--shadow-sm);
}

.avatar-sister {
  background: linear-gradient(135deg, #6366f1, #818cf8);
  color: #fff;
  border: 2px solid rgba(255, 255, 255, 0.2);
}

.avatar-younger {
  background: linear-gradient(135deg, #059669, #34d399);
  color: #0f172a;
  border: 2px solid rgba(255, 255, 255, 0.2);
}

.dialogue-bubble {
  max-width: 82%;
  padding: 14px 20px;
  border-radius: var(--radius-md);
  font-size: 1rem;
  line-height: 1.65;
  box-shadow: var(--shadow-sm);
  position: relative;
}

.dialogue-bubble-row.sister .dialogue-bubble {
  background: var(--bg-card);
  border: 1px solid rgba(129, 140, 248, 0.3);
  border-top-left-radius: 4px;
  color: var(--text-primary);
}

.dialogue-bubble-row.younger .dialogue-bubble {
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(52, 211, 153, 0.35);
  border-top-right-radius: 4px;
  color: var(--text-primary);
}

.dialogue-speaker-name {
  font-size: 0.75rem;
  font-weight: 700;
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.dialogue-bubble-row.sister .dialogue-speaker-name {
  color: var(--accent-secondary);
}

.dialogue-bubble-row.younger .dialogue-speaker-name {
  color: var(--accent-younger);
}

/* 2. 故事段落卡片 (Story Block) */
.story-card {
  background: var(--bg-card);
  border-left: 4px solid var(--accent-primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 20px 24px;
  box-shadow: var(--shadow-sm);
  margin: 10px 0;
}

.story-header {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-primary);
  margin-bottom: 10px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.story-paragraphs {
  color: var(--text-secondary);
  font-size: 0.98rem;
  line-height: 1.75;
}

.story-paragraphs p + p {
  margin-top: 10px;
}

/* 3. 四色概念盒子 (Concept Block) */
.concept-card {
  border-radius: var(--radius-md);
  padding: 22px 26px;
  margin: 12px 0;
  box-shadow: var(--shadow-sm);
  border-left: 5px solid;
  transition: all 0.2s ease;
}

.concept-card.green {
  background: var(--concept-green-bg);
  border-color: var(--concept-green-border);
}
.concept-card.green .concept-title { color: var(--concept-green-text); }

.concept-card.blue {
  background: var(--concept-blue-bg);
  border-color: var(--concept-blue-border);
}
.concept-card.blue .concept-title { color: var(--concept-blue-text); }

.concept-card.orange {
  background: var(--concept-orange-bg);
  border-color: var(--concept-orange-border);
}
.concept-card.orange .concept-title { color: var(--concept-orange-text); }

.concept-card.gray {
  background: var(--concept-gray-bg);
  border-color: var(--concept-gray-border);
}
.concept-card.gray .concept-title { color: var(--concept-gray-text); }

.concept-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.concept-title-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.concept-icon {
  font-size: 1.2rem;
}

.concept-title {
  font-size: 1.15rem;
  font-weight: 700;
}

.concept-content {
  font-size: 0.96rem;
  color: var(--text-primary);
  line-height: 1.7;
}

.concept-content p + p {
  margin-top: 8px;
}

/* 4. Canvas 交互动画容器 (Canvas Block) */
.canvas-anim-wrapper {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-md);
  margin: 16px 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.canvas-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
}

.canvas-title-box {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--accent-primary);
}

.canvas-viewport-container {
  width: 100%;
  height: 380px;
  background: #090d16;
  border-radius: var(--radius-md);
  overflow: hidden;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

[data-theme="light"] .canvas-viewport-container {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
}

.canvas-element {
  width: 100%;
  height: 100%;
  display: block;
}

.canvas-controls-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 14px;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

.control-group {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
}

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

.control-slider {
  accent-color: var(--accent-primary);
  cursor: pointer;
}

.control-val {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent-primary);
  min-width: 24px;
}

/* 5. 母题精析卡片 (Example Block) */
.example-card {
  background: var(--bg-card);
  border: 1px solid rgba(251, 191, 36, 0.35);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  margin: 18px 0;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.example-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 6px;
  height: 100%;
  background: linear-gradient(180deg, #f59e0b, #fbbf24);
}

.example-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-color);
}

.example-title-box {
  display: flex;
  align-items: center;
  gap: 12px;
}

.example-tag {
  background: rgba(245, 158, 11, 0.15);
  color: var(--accent-gold);
  font-size: 0.8rem;
  font-weight: 800;
  padding: 3px 8px;
  border-radius: 6px;
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.example-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
}

.example-question-box {
  background: var(--bg-secondary);
  padding: 16px 20px;
  border-radius: var(--radius-md);
  font-size: 1.02rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 18px;
  border: 1px solid var(--border-color);
}

.example-guide-section {
  margin: 16px 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.example-guide-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.example-solution-box {
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 18px 22px;
  margin-top: 16px;
}

[data-theme="light"] .example-solution-box {
  background: #f8fafc;
}

.example-solution-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--accent-younger);
  margin-bottom: 8px;
}

.example-solution-body {
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

.example-summary-box {
  margin-top: 14px;
  padding: 10px 14px;
  background: rgba(56, 189, 248, 0.08);
  border-left: 3px solid var(--accent-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.88rem;
  color: var(--accent-primary);
}

/* 6. 随堂测试卡片 (Quiz Block) */
.quiz-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  margin: 18px 0;
  box-shadow: var(--shadow-md);
}

.quiz-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.quiz-badge {
  background: linear-gradient(135deg, #ec4899, #8b5cf6);
  color: #fff;
  font-size: 0.76rem;
  font-weight: 800;
  padding: 3px 10px;
  border-radius: 12px;
  letter-spacing: 0.05em;
}

.quiz-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
}

.quiz-question {
  font-size: 1rem;
  color: var(--text-primary);
  line-height: 1.7;
  margin-bottom: 18px;
}

.quiz-options {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin-bottom: 16px;
}

.quiz-option-btn {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 18px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.95rem;
  text-align: left;
  cursor: pointer;
  transition: all 0.2s ease;
}

.quiz-option-btn:hover:not(.disabled) {
  border-color: var(--accent-primary);
  background: var(--bg-tertiary);
  transform: translateX(4px);
}

.quiz-option-label {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  flex-shrink: 0;
}

.quiz-option-btn.selected {
  border-color: var(--accent-primary);
  background: rgba(56, 189, 248, 0.15);
}

.quiz-option-btn.correct {
  border-color: #10b981 !important;
  background: rgba(16, 185, 129, 0.2) !important;
}

.quiz-option-btn.correct .quiz-option-label {
  background: #10b981;
  color: #fff;
}

.quiz-option-btn.wrong {
  border-color: #ef4444 !important;
  background: rgba(239, 68, 68, 0.2) !important;
}

.quiz-option-btn.wrong .quiz-option-label {
  background: #ef4444;
  color: #fff;
}

.quiz-feedback {
  padding: 16px 20px;
  border-radius: var(--radius-md);
  font-size: 0.94rem;
  line-height: 1.65;
  margin-top: 14px;
  display: none;
}

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

.quiz-feedback.correct {
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid #10b981;
  color: var(--text-primary);
}

.quiz-feedback.wrong {
  background: rgba(239, 68, 68, 0.12);
  border: 1px solid #ef4444;
  color: var(--text-primary);
}