/* pages/exercise.css — phần riêng của trang Bài tập (templates/pages/exercise.html).
   Bản vẽ: design/redesign-style-c/frames/BaiTap_Desktop.dc.html, BaiTap_Mobile.dc.html */

.ex-wrap { flex-wrap: wrap; }

/* Hộp "Bài lớp giao chưa làm" (nền cát nhạt thay cho xanh của callout thường) */
.ex-next { background: var(--amber-bg); padding: 16px 18px; }
.ex-next-icon {
  width: 32px; height: 32px; flex-shrink: 0;
  border-radius: var(--r-md); background: var(--bg);
  display: grid; place-items: center; color: var(--amber);
}
.ex-next .callout-body .icon { color: var(--amber); margin: 0; }
.ex-next-text { min-width: 0; }
.ex-next-label { margin: 2px 0 0; font-size: 13px; color: var(--muted); }
.ex-next-label:first-child { margin-top: 0; }
.ex-next-title { margin: 2px 0 0; font-size: 16px; font-weight: 600; color: var(--ink); overflow-wrap: anywhere; }
.ex-next-btn { height: 36px; flex-shrink: 0; }

/* Thẻ tự luyện */
.ex-cards { gap: 14px; }
.ex-card {
  display: flex; flex-direction: column;
  border: 1px solid var(--line); border-radius: var(--r-md); overflow: hidden;
  background: var(--bg); box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
}
.ex-card-art { height: 88px; display: grid; place-items: center; }
.ex-card-body { padding: 14px 16px 16px; display: flex; flex-direction: column; gap: 6px; flex-grow: 1; }
.ex-card-title { margin: 0; font-size: 15px; font-weight: 600; color: var(--ink); }
.ex-card-desc { flex-grow: 1; }
.ex-card-stat { margin: 0; font-size: 12px; color: var(--faint); }
.ex-card-body > div { margin-top: 8px; }
.ex-card-btn { height: 32px; }

/* Tab lọc (Tất cả / Chưa làm / Đã xong) */
.ex-tabs { display: flex; gap: 18px; border-bottom: 1px solid var(--line); margin-bottom: 4px; }
.ex-tab {
  height: 34px; padding: 0 2px; border: 0; background: none; cursor: pointer;
  font: inherit; font-size: 14px; color: var(--muted);
}
.ex-tab:hover { color: var(--ink); }
.ex-tab.is-active { color: var(--ink); font-weight: 600; box-shadow: inset 0 -2px 0 var(--ink); }
.ex-tab-count { color: var(--faint); font-weight: 400; }

/* Bảng bài lớp giao */
.ex-row {
  display: grid; grid-template-columns: minmax(0, 1fr) 130px 120px 64px 112px;
  align-items: center; gap: 8px;
  min-height: 44px; padding: 6px 8px;
  border-bottom: 1px solid var(--line); font-size: 14px;
}
.ex-row-head { min-height: 34px; padding: 0 8px; font-size: 13px; color: var(--muted); }
.ex-row.is-pending { background: var(--callout); }
.ex-row.is-pending .ex-name-text { font-weight: 600; }
.ex-name { display: flex; align-items: center; gap: 8px; min-width: 0; color: var(--ink); }
.ex-name .icon { color: var(--muted); }
.ex-name-text { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.ex-date { color: var(--muted); }
.ex-num { text-align: right; }
.ex-act { text-align: right; }
.ex-act .btn { height: 30px; }
.ex-redo { border-color: transparent; background: none; color: var(--muted); }
.ex-redo:hover { color: var(--accent); border-color: transparent; }
.ex-meta { display: none; }
.ex-empty { margin: 12px 0 0; display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.ex-empty .muted { margin: 0; }
.ex-more { margin-top: 12px; text-align: center; }
.ex-more[hidden] { display: none; }

@media (max-width: 860px) {
  .ex-next .btn { height: 44px; width: 100%; }
  .callout.ex-next { padding: 16px; }

  /* Thẻ tự luyện → danh sách trong một khung */
  .ex-cards { gap: 0; border: 1px solid var(--line); border-radius: var(--r-md); overflow: hidden; }
  .ex-card { flex-direction: row; gap: 12px; padding: 14px; border: 0; border-radius: 0; box-shadow: none; }
  .ex-card + .ex-card { border-top: 1px solid var(--line); }
  .ex-card-art { width: 40px; height: 40px; flex-shrink: 0; border-radius: var(--r-md); }
  .ex-card-art .icon { width: 20px; height: 20px; }
  .ex-card-body { padding: 0; gap: 4px; }
  .ex-card-btn { height: 40px; }

  /* Bảng → dòng hai tầng */
  .ex-row-head { display: none; }
  .ex-row { grid-template-columns: minmax(0, 1fr) auto; row-gap: 4px; padding: 12px 4px; }
  .ex-row.is-pending { background: none; }
  .ex-date, .ex-status, .ex-num { display: none; }
  .ex-name-text { white-space: normal; font-size: 15px; font-weight: 500; }
  .ex-name .icon { display: none; }
  .ex-act { grid-row: span 2; }
  .ex-act .btn { height: 40px; }
  .ex-redo { border-color: var(--line); color: var(--text); }
  .ex-meta { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; font-size: 13px; color: var(--muted); }
}