/* 学位英语刷题 · 全局样式（移动端优先） */

:root {
  --primary: #0f766e;        /* 主色：沉静的蓝绿 */
  --primary-dark: #0b5c56;
  --primary-light: #ccfbf1;
  --ok: #16a34a;
  --bad: #dc2626;
  --text: #1f2937;
  --text-2: #6b7280;
  --bg: #f3f4f6;
  --card: #ffffff;
  --border: #e5e7eb;
  --radius: 12px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 16px;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 14px 84px; /* 底部留出 tabbar 空间 */
}

/* ─── 顶部标题栏 ─── */
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--primary);
  color: #fff;
}
.topbar-inner {
  max-width: 720px;
  margin: 0 auto;
  padding: 12px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}
.topbar-title {
  font-size: 17px;
  font-weight: 600;
  margin: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.topbar-link {
  color: #fff;
  text-decoration: none;
  font-size: 14px;
  opacity: .9;
  white-space: nowrap;
}

/* ─── 底部 Tab（学生页） ─── */
.tabbar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 20;
  background: #fff;
  border-top: 1px solid var(--border);
  display: flex;
}
.tabbar-inner {
  max-width: 720px;
  margin: 0 auto;
  width: 100%;
  display: flex;
}
.tabbar a, .tabbar button {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 56px;
  padding: 6px 0;
  font-size: 12px;
  color: var(--text-2);
  text-decoration: none;
  background: none;
  border: none;
  cursor: pointer;
}
.tabbar a.active { color: var(--primary); font-weight: 600; }
.tabbar .tab-ico { font-size: 18px; line-height: 1; margin-bottom: 2px; }

/* ─── 卡片与通用元素 ─── */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin: 12px 0;
}
.card-title {
  margin: 0 0 10px;
  font-size: 16px;
  font-weight: 600;
}

.muted { color: var(--text-2); font-size: 14px; }
.small { font-size: 13px; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 44px;
  padding: 8px 18px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  background: var(--primary);
  color: #fff;
  font-size: 16px;
  cursor: pointer;
  text-decoration: none;
  -webkit-tap-highlight-color: transparent;
}
.btn:active { background: var(--primary-dark); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-secondary { background: #fff; color: var(--primary); border-color: var(--primary); }
.btn-secondary:active { background: var(--primary-light); }
.btn-danger { background: var(--bad); }
.btn-ghost { background: none; color: var(--primary); border: none; }
.btn-block { display: flex; width: 100%; }

/* 表格行内小按钮 */
.btn-sm { min-height: 32px; padding: 2px 10px; font-size: 13px; }

.btn-row {
  display: flex;
  gap: 10px;
  margin: 12px 0;
  flex-wrap: wrap;
}
.btn-row .btn { flex: 1; }

/* ─── 表单 ─── */
.field { margin: 12px 0; }
.field label {
  display: block;
  font-size: 14px;
  margin-bottom: 4px;
  color: var(--text);
}
.input, select.input, textarea.input {
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 16px;
  font-family: inherit;
  background: #fff;
  color: var(--text);
}
textarea.input { min-height: 96px; resize: vertical; line-height: 1.6; }
.input:focus { outline: 2px solid var(--primary); outline-offset: -1px; border-color: var(--primary); }

/* ─── 提示条 ─── */
.msg {
  border-radius: var(--radius);
  padding: 10px 14px;
  margin: 12px 0;
  font-size: 14px;
  white-space: pre-wrap;
  word-break: break-all;
}
.msg-error { background: #fef2f2; color: var(--bad); border: 1px solid #fecaca; }
.msg-ok { background: #f0fdf4; color: var(--ok); border: 1px solid #bbf7d0; }
.msg-warn { background: #fffbeb; color: #b45309; border: 1px solid #fde68a; }
.msg-info { background: #eff6ff; color: #1d4ed8; border: 1px solid #bfdbfe; }

.loading { text-align: center; color: var(--text-2); padding: 24px 0; }

/* ─── 首页模块卡片 ─── */
.module-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin: 12px 0;
}
@media (min-width: 560px) { .module-grid { grid-template-columns: 1fr 1fr 1fr; } }
.module-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 12px;
  text-decoration: none;
  color: var(--text);
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-height: 88px;
}
.module-card:active { background: var(--primary-light); }
.module-card .m-name { font-weight: 600; font-size: 15px; }
.module-card .m-progress { font-size: 13px; color: var(--text-2); margin-top: auto; }

.quick-links { display: flex; gap: 10px; flex-wrap: wrap; }
.quick-links .btn { flex: 1; min-width: 30%; }

/* ─── 做题页 ─── */
.stem {
  white-space: pre-wrap;
  word-break: break-word;
  font-size: 16px;
  margin: 8px 0 14px;
  line-height: 1.7;
  text-align: left;
}

.passage-box {
  position: sticky;
  top: 53px; /* 顶栏高度 */
  z-index: 10;
  background: #fffbeb;
  border: 1px solid #fde68a;
  border-radius: var(--radius);
  padding: 12px;
  margin: 12px 0;
  max-height: 40vh;
  overflow-y: auto;
  white-space: pre-wrap;
  word-break: break-word;
  font-size: 15px;
  line-height: 1.7;
  text-align: left;
}
.blank {
  color: #1d4ed8;
  font-weight: 700;
}
details.translation { margin: 10px 0; }
details.translation summary {
  cursor: pointer;
  color: var(--primary);
  font-size: 14px;
  min-height: 44px;
  display: flex;
  align-items: center;
}
.translation-body {
  white-space: pre-wrap;
  word-break: break-word;
  background: #f8fafc;
  border-radius: var(--radius);
  padding: 12px;
  margin-top: 8px;
  font-size: 15px;
  text-align: left;
}

/* 短文章节内题号导航（跳题/回看） */
.q-nav { display: flex; flex-wrap: wrap; gap: 6px; margin: 10px 0; }
.q-nav button {
  min-width: 40px;
  min-height: 40px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  font-size: 14px;
  cursor: pointer;
}
.q-nav button.current { border-color: var(--primary); color: var(--primary); font-weight: 700; }
.q-nav button.ok { background: #dcfce7; border-color: var(--ok); }
.q-nav button.bad { background: #fee2e2; border-color: var(--bad); }
}

.options { display: flex; flex-direction: column; gap: 8px; margin: 8px 0; }
.option {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #fff;
  font-size: 15px;
  text-align: left;
  cursor: pointer;
  color: var(--text);
  line-height: 1.5;
  font-family: inherit;
}
.option:active { background: var(--primary-light); }
.option.selected { border-color: var(--primary); background: var(--primary-light); }
.option.correct { border-color: var(--ok); background: #f0fdf4; }
.option.wrong { border-color: var(--bad); background: #fef2f2; }
.option:disabled { cursor: default; }
.option .opt-letter { font-weight: 700; flex-shrink: 0; }

.answer-panel {
  border-radius: var(--radius);
  padding: 12px 14px;
  margin: 12px 0;
  font-size: 15px;
  white-space: pre-wrap;
  word-break: break-word;
}
.answer-panel.ok { background: #f0fdf4; border: 1px solid #bbf7d0; }
.answer-panel.bad { background: #fef2f2; border: 1px solid #fecaca; }
.answer-panel.plain { background: #f8fafc; border: 1px solid var(--border); }
.verdict { font-weight: 700; font-size: 16px; margin-bottom: 6px; }
.verdict.ok { color: var(--ok); }
.verdict.bad { color: var(--bad); }

/* ─── 列表（错题本/收藏夹/名单/题目管理） ─── */
.filter-row { display: flex; gap: 10px; align-items: center; margin: 12px 0; }
.filter-row select { flex: 1; }

.list-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 14px;
  margin: 10px 0;
  cursor: pointer;
}
.list-item:active { background: var(--primary-light); }
.list-item .li-stem {
  font-size: 15px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  word-break: break-word;
}
.list-item .li-meta {
  margin-top: 6px;
  font-size: 13px;
  color: var(--text-2);
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.tag {
  display: inline-block;
  padding: 1px 8px;
  border-radius: 999px;
  font-size: 12px;
  background: var(--primary-light);
  color: var(--primary-dark);
}

/* ─── 表格 ─── */
.table-wrap { overflow-x: auto; }
table.tbl {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  background: #fff;
}
table.tbl th, table.tbl td {
  border: 1px solid var(--border);
  padding: 8px 10px;
  text-align: left;
  vertical-align: top;
}
table.tbl th { background: #f8fafc; white-space: nowrap; }

/* ─── 管理后台 ─── */
.tabs { display: flex; gap: 6px; margin: 12px 0; }
.tabs button {
  flex: 1;
  min-height: 44px;
  border: 1px solid var(--border);
  background: #fff;
  border-radius: var(--radius);
  font-size: 15px;
  cursor: pointer;
  color: var(--text);
}
.tabs button.active { background: var(--primary); color: #fff; border-color: var(--primary); }

.upload-panel {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin: 12px 0;
  text-align: center;
}
.upload-panel .input-file { margin: 8px 0; }

.stat-grid { display: flex; flex-wrap: wrap; gap: 8px; margin: 8px 0; }
.stat-chip {
  background: var(--primary-light);
  color: var(--primary-dark);
  border-radius: 999px;
  padding: 3px 12px;
  font-size: 13px;
}

/* ─── 弹层 ─── */
.modal-mask {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, .45);
  z-index: 50;
  display: flex;
  align-items: flex-end;
  justify-content: center;
}
@media (min-width: 560px) { .modal-mask { align-items: center; } }
.modal {
  background: #fff;
  width: 100%;
  max-width: 560px;
  max-height: 88vh;
  overflow-y: auto;
  border-radius: 16px 16px 0 0;
  padding: 18px 16px 24px;
}
@media (min-width: 560px) { .modal { border-radius: 16px; } }
.modal h3 { margin: 0 0 12px; font-size: 17px; }

/* ─── 一次性密码提示框 ─── */
.temp-pwd {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 2px;
  text-align: center;
  background: #f8fafc;
  border: 1px dashed var(--primary);
  border-radius: var(--radius);
  padding: 14px;
  margin: 10px 0;
  user-select: all;
}