/* Math100 - 小学生数学训练器样式文件 */

/* ==================== CSS 变量定义 ==================== */
:root {
  /* 马卡龙色系 - 活泼童趣 */
  --color-coral: #FF8B8B;
  --color-coral-light: #FFB4B4;
  --color-mint: #7EDCD2;
  --color-mint-light: #A8EFE8;
  --color-sky: #7EC8E3;
  --color-sky-light: #B0E0F0;
  --color-lemon: #F9D871;
  --color-lemon-light: #FBE8A9;
  --color-lavender: #B8A9D9;
  --color-lavender-light: #D4C9EB;

  /* 中性色 */
  --color-bg: #FFFAF5;
  --color-bg-pattern: #FEF6E9;
  --color-text-primary: #3D3D3D;
  --color-text-secondary: #6B6B6B;
  --color-text-light: #9A9A9A;
  --color-white: #FFFFFF;
  --color-border: #E8E0D5;

  /* 主题色 */
  --primary-color: #FF8B8B;
  --primary-gradient: linear-gradient(135deg, #FF8B8B 0%, #FFB4B4 100%);
  --secondary-color: #7EDCD2;
  --accent-color: #F9D871;

  /* 阴影 */
  --shadow-sm: 0 2px 8px rgba(255, 139, 139, 0.1);
  --shadow-md: 0 4px 16px rgba(255, 139, 139, 0.15);
  --shadow-lg: 0 8px 32px rgba(255, 139, 139, 0.2);
  --shadow-xl: 0 12px 48px rgba(255, 139, 139, 0.25);

  /* 圆角 */
  --radius-sm: 12px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-full: 9999px;

  /* 动画 */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
  --transition-bounce: 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* ==================== 基础样式 ==================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
  background-color: var(--color-bg);
  background-image:
    radial-gradient(circle at 20% 20%, var(--color-lemon-light) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, var(--color-mint-light) 0%, transparent 50%),
    radial-gradient(circle at 50% 50%, var(--color-lavender-light) 0%, transparent 50%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  position: relative;
  overflow-x: hidden;
}

/* 背景装饰圆点 */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image:
    radial-gradient(circle at 15% 30%, rgba(126, 220, 210, 0.3) 0%, transparent 8%),
    radial-gradient(circle at 85% 70%, rgba(255, 139, 139, 0.3) 0%, transparent 8%),
    radial-gradient(circle at 75% 20%, rgba(249, 216, 113, 0.3) 0%, transparent 6%),
    radial-gradient(circle at 25% 80%, rgba(184, 169, 217, 0.3) 0%, transparent 6%);
  pointer-events: none;
  z-index: 0;
}

.container {
  background: var(--color-white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  width: 100%;
  max-width: 480px;
  padding: 32px;
  min-height: 600px;
  position: relative;
  z-index: 1;
  overflow: hidden;
}

/* 装饰性顶部色条 */
.container::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 8px;
  background: linear-gradient(90deg,
    var(--color-coral) 0%,
    var(--color-lemon) 25%,
    var(--color-mint) 50%,
    var(--color-sky) 75%,
    var(--color-lavender) 100%
  );
}

/* ==================== 首页样式 ==================== */
.header {
  text-align: center;
  margin-bottom: 32px;
  animation: fadeInDown 0.6s ease;
}

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

.header-icon {
  font-size: 48px;
  margin-bottom: 12px;
  display: inline-block;
  animation: bounce 2s ease infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.header-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: 8px;
  letter-spacing: 2px;
  position: relative;
  display: inline-block;
}

.header-title::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 4px;
  background: var(--color-lemon);
  border-radius: var(--radius-full);
}

.header-subtitle {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-top: 12px;
}

.mode-section {
  margin-bottom: 28px;
  animation: fadeIn 0.6s ease 0.1s both;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.mode-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.mode-title::before,
.mode-title::after {
  content: '';
  flex: 1;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-border));
}

.mode-title::after {
  background: linear-gradient(90deg, var(--color-border), transparent);
}

.mode-list {
  display: grid;
  gap: 12px;
}

.mode-item {
  background: var(--color-bg-pattern);
  border: 3px solid transparent;
  border-radius: var(--radius-lg);
  padding: 18px 20px;
  cursor: pointer;
  transition: all var(--transition-normal);
  display: flex;
  align-items: center;
  gap: 14px;
  position: relative;
  overflow: hidden;
}

.mode-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.5), transparent);
  transition: left 0.5s;
}

.mode-item:hover::before {
  left: 100%;
}

.mode-item:hover {
  transform: translateY(-2px) scale(1.01);
  box-shadow: var(--shadow-md);
}

.mode-item.selected {
  border-color: var(--primary-color);
  background: linear-gradient(135deg, rgba(255, 139, 139, 0.1) 0%, rgba(255, 180, 180, 0.1) 100%);
  transform: scale(1.02);
}

.mode-item.selected .bullet {
  background: var(--primary-color);
  box-shadow: 0 0 0 4px rgba(255, 139, 139, 0.3);
  animation: pulse 1s ease infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.1); }
}

.mode-item .bullet {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-text-light);
  flex-shrink: 0;
  transition: all var(--transition-normal);
}

.mode-item .text {
  flex: 1;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text-primary);
}

.mode-item .emoji {
  font-size: 20px;
  transition: transform var(--transition-bounce);
}

.mode-item:hover .emoji {
  transform: scale(1.2) rotate(10deg);
}

.mode-item .best-score {
  font-size: 12px;
  font-weight: 700;
  color: var(--color-coral);
  background: rgba(255, 139, 139, 0.1);
  padding: 4px 10px;
  border-radius: var(--radius-full);
}

.start-btn {
  width: 100%;
  background: var(--primary-gradient);
  border: none;
  border-radius: var(--radius-lg);
  padding: 18px 24px;
  font-size: 17px;
  font-weight: 700;
  color: white;
  cursor: pointer;
  transition: all var(--transition-bounce);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  box-shadow: 0 6px 20px rgba(255, 139, 139, 0.35);
  animation: fadeIn 0.6s ease 0.2s both;
  position: relative;
  overflow: hidden;
}

.start-btn::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.4s, height 0.4s;
}

.start-btn:active::after {
  width: 300px;
  height: 300px;
}

.start-btn:hover:not(:disabled) {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 10px 30px rgba(255, 139, 139, 0.45);
}

.start-btn:hover:not(:disabled) .btn-icon {
  transform: translateX(5px);
}

.start-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.start-btn .btn-icon {
  transition: transform var(--transition-normal);
  font-size: 20px;
}

.progress-container {
  margin-top: 24px;
  animation: fadeIn 0.6s ease 0.3s both;
}

.progress-bar {
  background: var(--color-border);
  border-radius: var(--radius-full);
  height: 10px;
  overflow: hidden;
  position: relative;
}

.progress-fill {
  background: linear-gradient(90deg, var(--color-mint) 0%, var(--color-sky) 100%);
  height: 100%;
  border-radius: var(--radius-full);
  transition: width 0.5s var(--transition-bounce);
  position: relative;
  overflow: hidden;
}

.progress-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.4) 50%,
    transparent 100%
  );
  animation: shimmer 2s ease infinite;
}

@keyframes shimmer {
  from { transform: translateX(-100%); }
  to { transform: translateX(100%); }
}

/* ==================== 答题页样式 ==================== */
.exercise-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  padding: 16px 20px;
  background: var(--color-bg-pattern);
  border-radius: var(--radius-lg);
  animation: slideInRight 0.4s ease;
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.exercise-header-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-secondary);
}

.exercise-header .emoji {
  font-size: 18px;
}

.exercise-header-item span:last-child {
  font-variant-numeric: tabular-nums;
  color: var(--color-text-primary);
  font-size: 16px;
}

/* 题目进度条 */
.exercise-progress {
  margin-bottom: 24px;
}

.progress-dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 8px;
}

.progress-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-border);
  transition: all var(--transition-normal);
}

.progress-dot.current {
  background: var(--primary-color);
  transform: scale(1.3);
  box-shadow: 0 0 0 4px rgba(255, 139, 139, 0.2);
}

.progress-dot.completed {
  background: var(--color-mint);
}

.progress-dot.wrong {
  background: var(--color-coral);
}

.question-container {
  background: linear-gradient(145deg, var(--color-bg-pattern) 0%, var(--color-white) 100%);
  border-radius: var(--radius-xl);
  padding: 40px 30px;
  text-align: center;
  margin-bottom: 20px;
  border: 2px solid var(--color-border);
  position: relative;
  animation: fadeInUp 0.5s ease;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 装饰角标 */
.question-container::before,
.question-container::after {
  content: '✨';
  position: absolute;
  font-size: 20px;
}

.question-container::before {
  top: 12px;
  left: 12px;
}

.question-container::after {
  bottom: 12px;
  right: 12px;
  transform: rotate(180deg);
}

.question-number {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-light);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.question-number::before,
.question-number::after {
  content: '';
  width: 20px;
  height: 2px;
  background: var(--color-border);
  border-radius: var(--radius-full);
}

.question-text {
  font-size: 56px;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: 28px;
  font-family: 'SF Mono Display', 'Courier New', monospace;
  letter-spacing: 4px;
  position: relative;
  display: inline-block;
}

.answer-input {
  width: 100%;
  max-width: 200px;
  padding: 16px 24px;
  font-size: 32px;
  text-align: center;
  border: 3px solid var(--color-border);
  border-radius: var(--radius-lg);
  outline: none;
  transition: all var(--transition-normal);
  font-family: 'SF Mono Display', 'Courier New', monospace;
  font-weight: 700;
  background: var(--color-white);
  color: var(--color-text-primary);
}

.answer-input:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 4px rgba(255, 139, 139, 0.15);
  transform: scale(1.05);
}

.answer-input.correct {
  border-color: var(--color-mint);
  background: rgba(126, 220, 210, 0.1);
  animation: correctShake 0.5s ease;
}

.answer-input.wrong {
  border-color: var(--color-coral);
  background: rgba(255, 139, 139, 0.1);
  animation: wrongShake 0.5s ease;
}

@keyframes correctShake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-8px); }
  75% { transform: translateX(8px); }
}

@keyframes wrongShake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-8px); }
  40%, 80% { transform: translateX(8px); }
}

.submit-btn {
  width: 100%;
  max-width: 200px;
  background: var(--primary-gradient);
  border: none;
  border-radius: var(--radius-lg);
  padding: 16px 24px;
  font-size: 16px;
  font-weight: 700;
  color: white;
  cursor: pointer;
  margin-top: 20px;
  transition: all var(--transition-bounce);
  box-shadow: 0 6px 20px rgba(255, 139, 139, 0.35);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.submit-btn:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 10px 30px rgba(255, 139, 139, 0.45);
}

.submit-btn:active {
  transform: translateY(0) scale(0.98);
}

/* ==================== 结果页样式 ==================== */
.result-header {
  text-align: center;
  margin-bottom: 24px;
  animation: bounceIn 0.6s ease;
}

@keyframes bounceIn {
  0% {
    opacity: 0;
    transform: scale(0.5);
  }
  50% {
    transform: scale(1.1);
  }
  100% {
    opacity: 1;
    transform: scale(1);
  }
}

.result-icon {
  font-size: 64px;
  display: inline-block;
  animation: tada 1s ease infinite;
}

@keyframes tada {
  0%, 100% { transform: scale(1) rotate(0deg); }
  25% { transform: scale(1.1) rotate(-5deg); }
  75% { transform: scale(1.1) rotate(5deg); }
}

.result-title {
  font-size: 26px;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-top: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.result-subtitle {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-top: 8px;
}

/* 成绩卡片 */
.result-card {
  background: linear-gradient(145deg, var(--color-bg-pattern) 0%, var(--color-white) 100%);
  border-radius: var(--radius-xl);
  padding: 24px;
  margin-bottom: 20px;
  border: 2px solid var(--color-border);
  animation: slideInUp 0.5s ease 0.2s both;
}

@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.result-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 0;
  border-bottom: 2px dashed var(--color-border);
}

.result-row:last-child {
  border-bottom: none;
}

.result-label {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.result-label .emoji {
  font-size: 20px;
}

.result-value {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-text-primary);
  font-variant-numeric: tabular-nums;
}

/* 等级徽章 */
.grade-info {
  text-align: center;
  margin: 16px 0;
  animation: fadeIn 0.5s ease 0.3s both;
}

.grade-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 24px;
  border-radius: var(--radius-full);
  font-size: 18px;
  font-weight: 700;
}

.grade-badge.excellent {
  background: linear-gradient(135deg, #F9D871 0%, #FCE588 100%);
  color: #8B6914;
  box-shadow: 0 4px 15px rgba(249, 216, 113, 0.4);
}

.grade-badge.good {
  background: linear-gradient(135deg, #7EDCD2 0%, #A8EFE8 100%);
  color: #1A6B5F;
  box-shadow: 0 4px 15px rgba(126, 220, 210, 0.4);
}

.grade-badge.average {
  background: linear-gradient(135deg, #7EC8E3 0%, #B0E0F0 100%);
  color: #1A5A6B;
  box-shadow: 0 4px 15px rgba(126, 200, 227, 0.4);
}

.grade-badge.needs-practice {
  background: linear-gradient(135deg, #B8A9D9 0%, #D4C9EB 100%);
  color: #4A3A6B;
  box-shadow: 0 4px 15px rgba(184, 169, 217, 0.4);
}

/* 错题区域 */
.wrong-section {
  margin-bottom: 20px;
  animation: fadeIn 0.5s ease 0.4s both;
}

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

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

.wrong-item {
  background: linear-gradient(145deg, #FFF3E6 0%, #FFF9F0 100%);
  border: 2px solid #FFD5A8;
  border-left-width: 6px;
  border-radius: var(--radius-md);
  padding: 14px 16px;
  margin-bottom: 10px;
  font-size: 14px;
  color: #8B5A2B;
  display: flex;
  align-items: center;
  gap: 10px;
  transition: all var(--transition-normal);
}

.wrong-item:hover {
  transform: translateX(5px);
  box-shadow: var(--shadow-sm);
}

.wrong-item .emoji {
  font-size: 18px;
}

.wrong-item .question {
  font-weight: 600;
  color: var(--color-text-primary);
}

.wrong-item .answer-correct {
  color: var(--color-coral);
  font-weight: 600;
}

.wrong-item .answer-wrong {
  color: var(--color-text-light);
  text-decoration: line-through;
}

/* 建议区域 */
.recommendation {
  background: linear-gradient(145deg, #E8F4FD 0%, #F0F9FF 100%);
  border: 2px solid #8FD0F0;
  border-left-width: 6px;
  border-radius: var(--radius-md);
  padding: 16px;
  margin-bottom: 20px;
  font-size: 14px;
  color: #1A5A8B;
  animation: fadeIn 0.5s ease 0.5s both;
}

.recommendation-title {
  font-weight: 700;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 6px;
}

/* 按钮组 */
.action-buttons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  animation: fadeIn 0.5s ease 0.6s both;
}

.btn {
  padding: 14px 20px;
  border: none;
  border-radius: var(--radius-lg);
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-bounce);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  position: relative;
  overflow: hidden;
}

.btn .emoji {
  font-size: 18px;
  transition: transform var(--transition-normal);
}

.btn:hover .emoji {
  transform: scale(1.2) rotate(10deg);
}

.btn-primary {
  background: var(--primary-gradient);
  color: white;
  box-shadow: 0 4px 15px rgba(255, 139, 139, 0.35);
}

.btn-primary:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 8px 25px rgba(255, 139, 139, 0.45);
}

.btn-secondary {
  background: var(--color-bg-pattern);
  color: var(--color-text-primary);
  border: 2px solid var(--color-border);
}

.btn-secondary:hover {
  background: var(--color-white);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

/* ==================== 工具类 ==================== */
.hidden {
  display: none !important;
}

/* 响应式设计 */
@media (max-width: 480px) {
  .container {
    padding: 24px 20px;
    min-height: auto;
  }

  .header-title {
    font-size: 24px;
  }

  .question-text {
    font-size: 44px;
  }

  .answer-input {
    font-size: 26px;
    padding: 14px 20px;
  }

  .result-value {
    font-size: 18px;
  }

  .result-icon {
    font-size: 52px;
  }

  .result-title {
    font-size: 22px;
  }
}

/* 无错题时隐藏错题区域 */
.no-wrong .wrong-section {
  display: none;
}

/* 加载动画 */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(255,255,255,0.3);
  border-radius: 50%;
  border-top-color: white;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* 数字滚动动画 */
.count-up {
  transition: all 0.3s ease;
}