/* 中学生英语阅读网站 - 清新简洁风格 */

:root {
  --bg: #f6f8fb;
  --card: #ffffff;
  --primary: #4a7fd4;
  --primary-soft: #eaf1fb;
  --text: #2c3e50;
  --text-light: #7a8ba0;
  --border: #e5eaf1;
  --success: #3cb371;
  --error: #e05c5c;
  --radius: 14px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 17px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* 导航栏 */
.navbar {
  background: #fff;
  border-bottom: 1px solid var(--border);
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.navbar .brand {
  font-size: 19px;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: 0.5px;
}
.navbar .nav-right { display: flex; align-items: center; gap: 16px; font-size: 14px; }
.navbar .nav-right .name { color: var(--text); font-weight: 600; }
.navbar .nav-right .role-tag {
  font-size: 12px; color: #fff; background: var(--primary);
  padding: 2px 8px; border-radius: 20px;
}

/* 容器 */
.container { max-width: 920px; margin: 0 auto; padding: 28px 24px 60px; }

/* 卡片 */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 28px;
  margin-bottom: 18px;
}

/* 首页文章列表 */
.date-header {
  font-size: 15px; font-weight: 700; color: var(--text-light);
  margin: 28px 0 12px; display: flex; align-items: center; gap: 10px;
}
.date-header::after { content: ""; flex: 1; height: 1px; background: var(--border); }

.article-item {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 4px; border-bottom: 1px solid var(--border);
}
.article-item:last-child { border-bottom: none; }
.article-item .title { font-size: 16px; font-weight: 600; color: var(--text); }
.article-item .meta { font-size: 13px; color: var(--text-light); margin-top: 2px; }
.article-item .status {
  font-size: 12px; padding: 3px 10px; border-radius: 20px; white-space: nowrap;
}
.status.done { background: #e7f6ec; color: var(--success); }
.status.todo { background: var(--primary-soft); color: var(--primary); }

/* 阅读主题标签 */
.topic-tag {
  display: inline-block; font-size: 13px; padding: 3px 12px;
  background: var(--primary-soft); color: var(--primary);
  border-radius: 20px; font-weight: 600;
}

/* 阅读页 */
.article-passage {
  font-size: 18px; line-height: 1.5; color: #333;
  white-space: pre-wrap;
  text-align: justify;
}
.article-passage p {
  margin: 0 0 8px;
  text-indent: 2em;
}

.glossary {
  margin-top: 20px; padding: 14px 18px; background: #fbf7ee;
  border: 1px solid #f0e5c9; border-radius: 10px; font-size: 14px;
}
.glossary .item { display: inline-block; margin-right: 20px; color: #8a6d2f; }
.glossary .item b { color: #6b5320; }

/* 题目 */
.section-title {
  font-size: 17px; font-weight: 700; margin: 26px 0 12px;
  color: var(--text);
}
.question-block { margin-bottom: 22px; }
.question-text { font-size: 15.5px; font-weight: 600; margin-bottom: 8px; }
.option {
  display: block; padding: 9px 14px; margin: 6px 0;
  border: 1.5px solid var(--border); border-radius: 10px;
  cursor: pointer; transition: all 0.15s; font-size: 15px;
}
.option:hover { border-color: var(--primary); background: #f8fbff; }
.option input { margin-right: 8px; }

.option.correct { border-color: var(--success); background: #eafaf0; }
.option.wrong { border-color: var(--error); background: #fdf0f0; }
.explanation {
  margin-top: 8px; padding: 10px 14px; background: var(--primary-soft);
  border-radius: 8px; font-size: 14px; color: #446;
}
.explanation b { color: var(--primary); }

.thinking-box textarea {
  width: 100%; min-height: 120px; padding: 12px 14px;
  border: 1.5px solid var(--border); border-radius: 10px;
  font-size: 15px; font-family: inherit; resize: vertical;
}
.thinking-box textarea:focus { outline: none; border-color: var(--primary); }

/* 按钮 */
.btn {
  display: inline-block; padding: 10px 26px; border: none; border-radius: 10px;
  background: var(--primary); color: #fff; font-size: 15px; cursor: pointer;
  transition: opacity 0.15s;
}
.btn:hover { opacity: 0.9; text-decoration: none; }
.btn-secondary {
  background: #fff; color: var(--primary); border: 1.5px solid var(--primary);
}
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* 表单 */
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 6px; }
.form-group input {
  width: 100%; padding: 11px 14px; border: 1.5px solid var(--border);
  border-radius: 10px; font-size: 15px;
}
.form-group input:focus { outline: none; border-color: var(--primary); }
.form-group textarea {
  width: 100%; min-height: 120px; padding: 12px 14px;
  border: 1.5px solid var(--border); border-radius: 10px;
  font-size: 15px; font-family: inherit; line-height: 1.7;
  resize: vertical; box-sizing: border-box;
}
.form-group textarea:focus { outline: none; border-color: var(--primary); }
.form-group textarea.textarea-tall { min-height: 400px; }
.form-group textarea.textarea-mono { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 13px; line-height: 1.5; }

.auth-card { max-width: 420px; margin: 60px auto; }
.auth-card h1 { font-size: 22px; margin-bottom: 6px; text-align: center; }
.auth-card .sub { text-align: center; color: var(--text-light); font-size: 14px; margin-bottom: 26px; }

/* flash 提示 */
.flash {
  padding: 10px 16px; border-radius: 10px; margin-bottom: 16px; font-size: 14px;
}
.flash.ok { background: #e7f6ec; color: var(--success); }
.flash.error { background: #fdf0f0; color: var(--error); }

/* 统计页 */
.stat-cards { display: flex; gap: 16px; margin-bottom: 24px; }
.stat-card {
  flex: 1; background: #fff; border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px; text-align: center;
}
.stat-card .num { font-size: 28px; font-weight: 700; color: var(--primary); }
.stat-card .label { font-size: 13px; color: var(--text-light); margin-top: 4px; }

/* 表格 */
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { padding: 11px 12px; text-align: left; border-bottom: 1px solid var(--border); }
th { background: #fafbfd; color: var(--text-light); font-weight: 600; }
tr:hover td { background: #fafcff; }

.eval-tag {
  font-size: 12px; padding: 2px 8px; border-radius: 20px; display: inline-block;
}
.eval-tag.good { background: #e7f6ec; color: var(--success); }
.eval-tag.mid { background: #fff7e6; color: #d68a1a; }
.eval-tag.weak { background: #fdf0f0; color: var(--error); }
.eval-tag.pending { background: #f0f2f5; color: var(--text-light); }

.thinking-eval-box {
  margin-top: 10px; padding: 14px 16px; background: #f8fafc;
  border: 1px solid var(--border); border-radius: 10px; font-size: 14px;
}

/* 生词本闪卡 */
.vocab-card {
  perspective: 800px;
  cursor: pointer;
  height: 120px;
}
.vc-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.5s;
  transform-style: preserve-3d;
}
.vocab-card.flipped .vc-inner { transform: rotateY(180deg); }
.vc-face {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #fff;
  padding: 10px;
  text-align: center;
}
.vc-back { transform: rotateY(180deg); background: #f6f9ff; }
.vc-word { font-size: 18px; font-weight: 600; }
.vc-hint { font-size: 11px; color: var(--text-light); margin-top: 6px; }
.vc-meaning { font-size: 16px; }

/* 文中可点击查词的单词 */
.article-passage .w {
  cursor: pointer;
  border-bottom: 1px dashed #c5d5ea;
  transition: background 0.15s;
}
.article-passage .w:hover { background: #eaf1fb; }

/* 排行榜高亮 */
.rank-me { background: #fff8e6 !important; }
.rank-medal { font-size: 20px; }

/* 平板 */
@media (max-width: 1024px) {
  .container { max-width: 100%; padding: 22px 20px 50px; }
}

/* 手机 */
@media (max-width: 768px) {
  body { font-size: 16px; }
  .container { padding: 16px 14px 40px; }
  .card { padding: 20px 18px; }
  .article-passage { font-size: 17px; line-height: 1.7; }
  .article-passage p { margin-bottom: 11px; }
  .stat-cards { flex-direction: column; }
  .navbar { padding: 12px 16px; flex-wrap: wrap; gap: 8px; }
  .navbar .nav-right { flex-wrap: wrap; gap: 10px; font-size: 13px; }
  .navbar .brand { font-size: 17px; }
  .question-text { font-size: 15.5px; }
  .option { font-size: 15px; padding: 10px 12px; }
  table { font-size: 13px; display: block; overflow-x: auto; }
  th, td { padding: 9px 8px; white-space: nowrap; }
  .auth-card { margin: 30px auto; }
  h1 { font-size: 21px; }
}