/* ============================================================
 * 资料分析练习 — 样式表（手机优先，蓝绿色主调）
 * 验收宽度：360px / 390px / 430px，整页不横向滚动。
 * 不引入外部字体、图标、图片或 CDN。
 * ============================================================ */

:root {
  --color-primary: #0f766e;          /* 主色：深蓝绿 */
  --color-primary-light: #14b8a6;     /* 辅助：亮蓝绿 */
  --color-primary-soft: #ccfbf1;      /* 浅蓝绿底色 */
  --color-bg: #f4fbfa;                /* 页面背景 */
  --color-card: #ffffff;              /* 卡片背景 */
  --color-text: #0f172a;              /* 正文 */
  --color-text-muted: #475569;        /* 次要文字 */
  --color-border: #e2e8f0;            /* 边框 */
  --color-correct: #16a34a;           /* 正确 */
  --color-wrong: #dc2626;             /* 错误 */
  --color-danger: #b91c1c;            /* 危险操作 */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --touch: 44px;
  --shadow-card: 0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  overflow-x: hidden;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
    "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* 顶部标题 + 四列导航（正常文档流，非固定底部） */
.app-header {
  width: 100%;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: #fff;
  padding: 12px 12px 0;
  box-shadow: 0 2px 6px rgba(15, 118, 110, 0.18);
}

.app-title {
  margin: 0 0 10px;
  font-size: 20px;
  font-weight: 700;
  text-align: center;
  letter-spacing: 0.5px;
}

.top-nav {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 4px;
  width: 100%;
}

.nav-item {
  appearance: none;
  border: none;
  background: transparent;
  color: rgba(255, 255, 255, 0.85);
  font-size: 15px;
  font-weight: 600;
  padding: 0 4px;
  height: var(--touch);
  border-bottom: 3px solid transparent;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-item.is-active {
  color: #fff;
  border-bottom-color: #fff;
}

.nav-item:active {
  background: rgba(255, 255, 255, 0.1);
}

/* 主体区 */
.app-main {
  flex: 1 1 auto;
  width: 100%;
  max-width: 480px;
  margin: 0 auto;
  padding: 12px;
}

/* 页面切换 */
.page {
  display: none;
}

.page.is-active {
  display: block;
}

/* 卡片 */
.card {
  background: var(--color-card);
  border-radius: var(--radius-md);
  padding: 14px;
  margin-bottom: 12px;
  box-shadow: var(--shadow-card);
  border: 1px solid var(--color-border);
}

.card-title {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 700;
  color: var(--color-primary);
}

.list-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}

.list-head .card-title {
  margin: 0;
}

/* 概览列表 */
.summary-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.summary-list li {
  padding: 8px 0;
  border-bottom: 1px dashed var(--color-border);
  font-size: 15px;
  color: var(--color-text);
}

.summary-list li:last-child {
  border-bottom: none;
}

.summary-list li span {
  float: right;
  font-weight: 700;
  color: var(--color-primary);
}

.recent-summary {
  margin: 10px 0 0;
  font-size: 14px;
  color: var(--color-text-muted);
}

/* 按钮 */
.btn {
  appearance: none;
  -webkit-appearance: none;
  min-height: var(--touch);
  padding: 0 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: #fff;
  color: var(--color-text);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

.btn-primary:active {
  background: #0b5e57;
}

.btn-danger {
  background: #fff;
  border-color: var(--color-danger);
  color: var(--color-danger);
}

.btn-danger:active {
  background: #fef2f2;
}

.btn-sm {
  min-height: var(--touch);
  padding: 0 12px;
  font-size: 14px;
}

.button-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
}

.button-group .btn {
  flex: 1 1 calc(50% - 4px);
  min-width: 140px;
}

.hint {
  margin: 8px 0 0;
  font-size: 13px;
  color: var(--color-text-muted);
  min-height: 18px;
}

/* Chip 筛选 */
.form-row {
  margin-bottom: 14px;
}

.form-label {
  display: block;
  margin-bottom: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-muted);
}

.chip-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  appearance: none;
  min-height: var(--touch);
  padding: 0 14px;
  border-radius: 999px;
  border: 1px solid var(--color-border);
  background: #fff;
  color: var(--color-text);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.chip.is-active {
  background: var(--color-primary-soft);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.chip:active {
  background: var(--color-primary-soft);
}

/* 练习进度条与退出 */
.practice-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
}

/* 材料区（含表格） */
.material-block {
  background: var(--color-primary-soft);
  border-radius: var(--radius-sm);
  padding: 10px;
  margin-bottom: 12px;
  font-size: 14px;
  color: var(--color-text);
}

.material-block h3 {
  margin: 0 0 6px;
  font-size: 15px;
  color: var(--color-primary);
}

.material-block p {
  margin: 0 0 8px;
  color: var(--color-text-muted);
}

.material-block table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  display: block;
  overflow-x: auto;
  max-width: 100%;
  -webkit-overflow-scrolling: touch;
}

.material-block table thead th {
  background: var(--color-primary);
  color: #fff;
  padding: 6px 8px;
  text-align: center;
  font-weight: 600;
  white-space: nowrap;
}

.material-block table tbody td {
  padding: 6px 8px;
  border-bottom: 1px solid var(--color-border);
  text-align: center;
  background: #fff;
  white-space: nowrap;
}

/* 题干与选项 */
.question-stem {
  margin: 0 0 12px;
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
}

.options {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 12px;
}

.option {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  min-height: var(--touch);
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--color-border);
  background: #fff;
  font-size: 15px;
  cursor: pointer;
  text-align: left;
  width: 100%;
  font-family: inherit;
  color: var(--color-text);
  transition: background 0.15s, border-color 0.15s;
}

.option .option-letter {
  font-weight: 700;
  color: var(--color-primary);
  flex-shrink: 0;
}

.option.is-selected {
  border-color: var(--color-primary);
  background: var(--color-primary-soft);
}

.option.is-locked {
  cursor: default;
}

.option.is-correct {
  border-color: var(--color-correct);
  background: #f0fdf4;
  color: var(--color-correct);
}

.option.is-correct .option-letter {
  color: var(--color-correct);
}

.option.is-wrong {
  border-color: var(--color-wrong);
  background: #fef2f2;
  color: var(--color-wrong);
}

.option.is-wrong .option-letter {
  color: var(--color-wrong);
}

/* 反馈区 */
.feedback {
  margin-top: 12px;
  padding: 12px;
  border-radius: var(--radius-sm);
  background: #f8fafc;
  border: 1px solid var(--color-border);
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-text);
}

.feedback.is-correct {
  background: #f0fdf4;
  border-color: #bbf7d0;
}

.feedback.is-wrong {
  background: #fef2f2;
  border-color: #fecaca;
}

.feedback-title {
  font-weight: 700;
  margin-bottom: 4px;
}

.feedback.is-correct .feedback-title {
  color: var(--color-correct);
}

.feedback.is-wrong .feedback-title {
  color: var(--color-wrong);
}

.feedback-answer,
.feedback-analysis {
  margin-top: 4px;
}

/* 空状态 */
.empty-state {
  margin: 0 0 12px;
  font-size: 14px;
  color: var(--color-text-muted);
  text-align: center;
  padding: 20px 8px;
}

/* 错题条目 */
.wrong-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 12px;
  margin-bottom: 10px;
  background: #fff;
}

.wrong-item-meta {
  font-size: 12px;
  color: var(--color-text-muted);
  margin-bottom: 6px;
}

.wrong-item-meta .tag {
  display: inline-block;
  margin-right: 6px;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--color-primary-soft);
  color: var(--color-primary);
  font-weight: 600;
}

.wrong-item-stem {
  font-size: 15px;
  margin: 0 0 8px;
}

.wrong-item-row {
  font-size: 13px;
  margin: 2px 0;
  color: var(--color-text-muted);
}

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

.wrong-item-row.is-wrong {
  color: var(--color-wrong);
  font-weight: 600;
}

.wrong-item-analysis {
  margin: 8px 0 0;
  padding: 8px;
  background: #f8fafc;
  border-radius: 6px;
  font-size: 13px;
  color: var(--color-text);
}

.wrong-item-actions {
  margin-top: 8px;
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

/* 统计表格 */
.table-wrap {
  display: block;
  overflow-x: auto;
  max-width: 100%;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}

.table-wrap table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  min-width: 280px;
}

.table-wrap th,
.table-wrap td {
  padding: 8px;
  text-align: center;
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}

.table-wrap th {
  background: var(--color-primary);
  color: #fff;
  font-weight: 600;
}

.table-wrap tr:last-child td {
  border-bottom: none;
}

.table-wrap tr.total-row td {
  font-weight: 700;
  background: var(--color-primary-soft);
}

/* 模态对话框 */
.modal {
  position: fixed;
  inset: 0;
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.modal[hidden] {
  display: none;
}

.modal-mask {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.45);
}

.modal-card {
  position: relative;
  background: #fff;
  border-radius: var(--radius-md);
  padding: 16px;
  width: 100%;
  max-width: 360px;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.25);
}

.modal-title {
  margin: 0 0 8px;
  font-size: 16px;
  color: var(--color-primary);
}

.modal-text {
  margin: 0 0 14px;
  font-size: 14px;
  color: var(--color-text);
  white-space: pre-line;
}

.modal-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
}

/* 题库加载错误 */
.fatal-error {
  position: fixed;
  inset: 0;
  background: #fff;
  z-index: 1000;
  padding: 20px;
  overflow: auto;
  font-size: 14px;
  color: var(--color-danger);
}

.fatal-error[hidden] {
  display: none;
}

.fatal-error h2 {
  color: var(--color-danger);
  margin: 0 0 12px;
}

.fatal-error pre {
  white-space: pre-wrap;
  word-break: break-all;
  background: #fef2f2;
  padding: 10px;
  border-radius: 6px;
  font-size: 13px;
}

/* ============================================================
 * 验收宽度微调（360/390/430 三档）
 * ============================================================ */
@media (max-width: 360px) {
  .app-title {
    font-size: 18px;
  }
  .nav-item {
    font-size: 14px;
  }
  .btn,
  .chip,
  .option {
    font-size: 14px;
  }
  .question-stem {
    font-size: 15px;
  }
  .button-group .btn {
    flex: 1 1 100%;
    min-width: 0;
  }
}

@media (min-width: 431px) {
  .app-main {
    padding: 16px;
  }
  .card {
    padding: 16px;
  }
}