/* ============= 阿风 中考复习小程序 v1.0 =============
   设计目标：移动优先 / 电脑/微信/PAD 通用
   配色：物理=蓝调
   ============================================== */

:root {
  --primary: #4f8cff;
  --primary-dark: #2b6cdf;
  --primary-light: #e8f0ff;
  --success: #22c55e;
  --error: #ef4444;
  --warning: #f59e0b;
  --bg: #f5f7fa;
  --card: #ffffff;
  --text: #1f2937;
  --text-light: #6b7280;
  --border: #e5e7eb;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.12);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif; background: var(--bg); color: var(--text); -webkit-font-smoothing: antialiased; }
body { min-height: 100vh; line-height: 1.6; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input, textarea { font-family: inherit; }

/* ===== 容器 ===== */
.app { max-width: 720px; margin: 0 auto; padding: 16px; min-height: 100vh; }
@media (min-width: 800px) { .app { max-width: 760px; padding: 24px; } }

/* ===== 顶部 Header ===== */
.app-header {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white; padding: 20px 16px; border-radius: var(--radius-lg);
  margin-bottom: 16px; box-shadow: var(--shadow);
}
.app-header h1 { font-size: 22px; font-weight: 600; }
.app-header .subtitle { opacity: 0.9; font-size: 14px; margin-top: 4px; }

/* ===== 倒计时 ===== */
.countdown {
  background: linear-gradient(135deg, #f59e0b, #ef4444);
  color: white; padding: 18px; border-radius: var(--radius-lg);
  margin-bottom: 16px; text-align: center; box-shadow: var(--shadow);
}
.countdown .days { font-size: 48px; font-weight: 700; line-height: 1; }
.countdown .label { font-size: 14px; opacity: 0.95; margin-top: 4px; }
.countdown .exam-info { font-size: 12px; opacity: 0.85; margin-top: 6px; }

/* ===== 用户选择 ===== */
.user-bar {
  display: flex; gap: 8px; align-items: center;
  background: var(--card); padding: 10px 14px; border-radius: var(--radius);
  margin-bottom: 12px; box-shadow: var(--shadow-sm);
}
.user-bar .user-list { display: flex; gap: 6px; flex: 1; flex-wrap: wrap; }
.user-pill {
  padding: 6px 12px; border-radius: 20px; background: var(--bg);
  font-size: 13px; cursor: pointer; border: 2px solid transparent;
  transition: all 0.2s;
}
.user-pill.active { background: var(--primary); color: white; }
.user-pill:hover:not(.active) { border-color: var(--primary); }
.user-pill.add { background: var(--primary-light); color: var(--primary); }

/* ===== 章节卡 ===== */
.chapter-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 12px; margin-bottom: 16px;
}
.chapter-card {
  background: var(--card); border-radius: var(--radius);
  padding: 14px; text-align: center; cursor: pointer; box-shadow: var(--shadow-sm);
  transition: all 0.2s; position: relative; overflow: hidden;
}
.chapter-card:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.chapter-card .icon { font-size: 32px; margin-bottom: 4px; display: block; }
.chapter-card .title { font-size: 13px; font-weight: 500; }
.chapter-card .progress {
  position: absolute; bottom: 0; left: 0; right: 0; height: 4px;
  background: var(--primary-light);
}
.chapter-card .progress .bar {
  height: 100%; background: var(--primary); transition: width 0.3s;
}
.chapter-card .badge {
  position: absolute; top: 6px; right: 6px; background: var(--success);
  color: white; font-size: 10px; padding: 2px 6px; border-radius: 10px;
}

/* ===== 按钮 ===== */
.btn {
  padding: 10px 20px; border-radius: var(--radius);
  font-size: 14px; font-weight: 500; cursor: pointer;
  transition: all 0.2s; display: inline-flex; align-items: center; gap: 6px;
}
.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-primary:disabled { background: var(--text-light); cursor: not-allowed; }
.btn-secondary { background: var(--primary-light); color: var(--primary); }
.btn-ghost { background: transparent; color: var(--text-light); }
.btn-success { background: var(--success); color: white; }
.btn-error { background: var(--error); color: white; }
.btn-block { width: 100%; justify-content: center; }
.btn-lg { padding: 14px 24px; font-size: 16px; }

/* ===== 答题区 ===== */
.quiz-screen { display: none; }
.quiz-screen.active { display: block; }
.screen { display: none; }
.screen.active { display: block; }
.quiz-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 12px; padding: 10px 14px; background: var(--card);
  border-radius: var(--radius); box-shadow: var(--shadow-sm);
}
.quiz-progress { font-size: 13px; color: var(--text-light); }
.quiz-score { font-size: 13px; color: var(--primary); font-weight: 600; }
.question-card {
  background: var(--card); border-radius: var(--radius-lg);
  padding: 20px; box-shadow: var(--shadow); margin-bottom: 16px;
}
.question-meta { display: flex; gap: 8px; margin-bottom: 12px; flex-wrap: wrap; }
.tag {
  font-size: 11px; padding: 2px 8px; border-radius: 10px; background: var(--primary-light); color: var(--primary);
}
.tag.fill { background: #fef3c7; color: #92400e; }
.tag.choice { background: #dbeafe; color: #1e40af; }
.question-stem { font-size: 16px; line-height: 1.7; margin-bottom: 16px; }

/* 选择题选项 */
.options { display: flex; flex-direction: column; gap: 8px; }
.option {
  padding: 12px 14px; background: var(--bg); border-radius: var(--radius);
  border: 2px solid transparent; cursor: pointer; transition: all 0.2s;
  display: flex; align-items: center; gap: 10px; font-size: 14px;
}
.option:hover { background: var(--primary-light); }
.option.selected { background: var(--primary-light); border-color: var(--primary); }
.option.correct { background: #d1fae5; border-color: var(--success); }
.option.wrong { background: #fee2e2; border-color: var(--error); }
.option.disabled { cursor: not-allowed; opacity: 0.7; }
.option .letter { font-weight: 600; color: var(--text-light); width: 20px; }

/* 填空题输入 */
.fill-inputs { display: flex; flex-direction: column; gap: 12px; }
.fill-input {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
}
.fill-input label { font-size: 14px; color: var(--text-light); }
.fill-input input {
  flex: 1; min-width: 100px; padding: 10px 12px; border: 2px solid var(--border);
  border-radius: 8px; font-size: 14px; transition: border 0.2s;
}
.fill-input input:focus { outline: none; border-color: var(--primary); }
.fill-input input.correct { border-color: var(--success); background: #d1fae5; }
.fill-input input.wrong { border-color: var(--error); background: #fee2e2; }

/* 答案反馈 */
.feedback {
  margin-top: 16px; padding: 14px; border-radius: var(--radius);
  background: var(--primary-light); border-left: 4px solid var(--primary);
}
.feedback.correct { background: #d1fae5; border-color: var(--success); }
.feedback.wrong { background: #fee2e2; border-color: var(--error); }
.feedback h4 { font-size: 14px; margin-bottom: 6px; }
.feedback p { font-size: 13px; color: var(--text); }
.feedback .correct-answer {
  display: inline-block; margin-top: 6px; padding: 4px 10px;
  background: white; border-radius: 6px; font-weight: 600;
  color: var(--primary-dark);
}

/* 操作区 */
.quiz-actions {
  display: flex; gap: 8px; justify-content: space-between; margin-top: 16px;
}

/* ===== 章节结算 ===== */
.result-screen { display: none; }
.result-screen.active { display: block; }
.result-card {
  background: var(--card); border-radius: var(--radius-lg);
  padding: 30px 20px; text-align: center; box-shadow: var(--shadow); margin-bottom: 16px;
}
.result-icon { font-size: 64px; margin-bottom: 12px; }
.result-score { font-size: 42px; font-weight: 700; color: var(--primary); }
.result-text { color: var(--text-light); margin-top: 4px; }
.result-actions { display: flex; gap: 10px; margin-top: 20px; justify-content: center; flex-wrap: wrap; }

/* ===== 工具栏 ===== */
.toolbar {
  display: flex; gap: 8px; align-items: center; padding: 10px 0;
  border-top: 1px solid var(--border); margin-top: 20px;
  justify-content: space-around;
}
.toolbar .spacer { display: none; }
.icon-btn-wrap { display: flex; flex-direction: column; align-items: center; gap: 2px; }
.icon-btn-wrap span { font-size: 10px; color: var(--text-light); }
.icon-btn {
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--card); display: flex; align-items: center; justify-content: center;
  box-shadow: var(--shadow-sm); cursor: pointer; font-size: 16px;
  transition: all 0.2s;
}
.icon-btn:hover { transform: scale(1.05); }
.icon-btn.off { opacity: 0.4; }

/* ===== 模态框 ===== */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.5);
  display: none; align-items: center; justify-content: center;
  z-index: 100; padding: 20px;
}
.modal-overlay.active { display: flex; }
.modal {
  background: var(--card); border-radius: var(--radius-lg);
  padding: 24px; max-width: 400px; width: 100%;
}
.modal h3 { font-size: 18px; margin-bottom: 12px; }
.modal p { font-size: 14px; color: var(--text-light); margin-bottom: 16px; }
.modal input {
  width: 100%; padding: 10px 12px; border: 2px solid var(--border);
  border-radius: 8px; font-size: 14px; margin-bottom: 12px;
}
.modal input:focus { outline: none; border-color: var(--primary); }
.modal-actions { display: flex; gap: 8px; justify-content: flex-end; }

/* ===== 状态卡 ===== */
.stat-cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; margin-bottom: 16px; }
.stat-card {
  background: var(--card); padding: 14px; border-radius: var(--radius);
  text-align: center; box-shadow: var(--shadow-sm);
}
.stat-card .value { font-size: 22px; font-weight: 700; color: var(--primary); }
.stat-card .label { font-size: 12px; color: var(--text-light); margin-top: 2px; }

/* ===== 错题 ===== */
.wrong-list { background: var(--card); border-radius: var(--radius); padding: 12px; box-shadow: var(--shadow-sm); }
.wrong-item { padding: 10px 0; border-bottom: 1px solid var(--border); cursor: pointer; }
.wrong-item:last-child { border-bottom: none; }
.wrong-item:hover { color: var(--primary); }

/* ===== 列表/章节复习提示 ===== */
.section-title {
  font-size: 14px; font-weight: 600; color: var(--text-light);
  margin: 16px 0 8px; display: flex; align-items: center; gap: 6px;
}

/* ===== 加载/空状态 ===== */
.empty {
  text-align: center; padding: 40px 20px; color: var(--text-light);
}
.empty .icon { font-size: 48px; margin-bottom: 8px; }

/* ===== 动画 ===== */
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-8px); }
  75% { transform: translateX(8px); }
}
.shake { animation: shake 0.3s ease-in-out; }
@keyframes pop {
  0% { transform: scale(1); }
  50% { transform: scale(1.2); }
  100% { transform: scale(1); }
}
.pop { animation: pop 0.3s ease-in-out; }

/* ===== 移动端适配 ===== */
@media (max-width: 480px) {
  .app { padding: 12px; }
  .app-header h1 { font-size: 18px; }
  .countdown .days { font-size: 38px; }
  .chapter-grid { grid-template-columns: repeat(3, 1fr); gap: 8px; }
  .chapter-card { padding: 10px 6px; }
  .chapter-card .icon { font-size: 24px; }
  .chapter-card .title { font-size: 11px; }
  .question-stem { font-size: 15px; }
  .option { padding: 10px; font-size: 13px; }
}