/* ===== 設計變數 ===== */
:root, [data-accent="terracotta"] { --ac:#a85d22; --ac-deep:#5b3a18; --ac-soft:#f0e2cd; }
[data-accent="forest"] { --ac:#3f6b4c; --ac-deep:#274434; --ac-soft:#e2ebe2; }
[data-accent="wine"]   { --ac:#8a2e3b; --ac-deep:#5a1f29; --ac-soft:#f1dde0; }
[data-accent="indigo"] { --ac:#3a5a8c; --ac-deep:#26395c; --ac-soft:#dfe6f1; }
[data-accent="slate"]  { --ac:#5a5550; --ac-deep:#3a3631; --ac-soft:#e7e3de; }

:root {
  --paper:#f5efe4; --surface:#fbf7ef; --surface-soft:#f7f0e3;
  --line:#e6dcc8; --line-soft:#efe7d7;
  --ink:#3a3127; --muted:#9a8a72;
  --ok:#3f6b4c; --ok-soft:#e2ebe2;
  --warn:#a8671e; --warn-soft:#f6e6cf;
  --danger:#8a2e3b; --danger-soft:#f1dde0;
  --shadow:0 10px 30px rgba(74, 59, 41, .10);
  --serif:"Noto Serif TC", Georgia, "Songti TC", serif;
  --sans:"Noto Sans TC", system-ui, -apple-system, "Microsoft JhengHei", sans-serif;
}
* { box-sizing:border-box; }
html { min-height:100%; }
body {
  min-height:100%; margin:0; color:var(--ink);
  background:
    radial-gradient(circle at top left, rgba(168,93,34,.06), transparent 32rem),
    var(--paper);
  font-family:var(--sans); font-size:16px; line-height:1.6;
}
a { color:var(--ac); text-decoration:none; }
a:hover { color:var(--ac-deep); text-decoration:underline; }

/* ===== Header ===== */
header {
  position:sticky; top:0; z-index:10;
  display:flex; align-items:center; gap:1rem;
  padding:.75rem max(1rem, calc((100vw - 1120px) / 2));
  background:rgba(251,247,239,.9); border-bottom:1px solid var(--line);
  backdrop-filter:blur(14px);
}
header .brand {
  display:inline-flex; align-items:center; min-height:2.25rem;
  color:var(--ac); font-family:var(--serif); font-weight:900;
  text-decoration:none; white-space:nowrap;
}
header nav { display:flex; align-items:center; gap:.25rem; flex-wrap:wrap; }
header nav a {
  display:inline-flex; align-items:center; min-height:2.25rem;
  padding:.35rem .7rem; color:#6b5d49; border-radius:7px; text-decoration:none;
}
header nav a:hover { background:var(--ac-soft); color:var(--ac-deep); text-decoration:none; }
header .spacer { flex:1; }

/* ===== 色票切換 ===== */
.theme-swatches { display:flex; align-items:center; gap:.35rem; }
.theme-swatches .sw {
  width:1.35rem; height:1.35rem; border-radius:50%; cursor:pointer;
  border:2px solid transparent; padding:0; background-clip:padding-box;
  transition:transform .12s ease;
}
.theme-swatches .sw:hover { transform:scale(1.15); }
.theme-swatches .sw[aria-pressed="true"] { border-color:var(--ink); }

/* ===== 版心 / 標題 ===== */
main { width:min(100%, 1120px); margin:1.6rem auto 3rem; padding:0 1rem; }
h1, h2, h3 { font-family:var(--serif); color:var(--ac-deep); line-height:1.3; }
h2 { font-size:1.55rem; }
h3 { font-size:1.15rem; }

/* ===== 卡片 ===== */
.card {
  background:var(--surface); border:1px solid var(--line); border-radius:12px;
  padding:1.15rem 1.25rem; margin-bottom:1rem; box-shadow:var(--shadow);
}
.card > :first-child { margin-top:0; }
.card > :last-child { margin-bottom:0; }
.page-head {
  background:linear-gradient(135deg, var(--surface) 0%, var(--ac-soft) 100%);
  border-color:var(--line);
}
.page-head h2 { margin:.15rem 0; }

/* ===== 課程卡片網格（dashboard） ===== */
.course-grid {
  display:grid; grid-template-columns:repeat(auto-fill, minmax(260px, 1fr));
  gap:1rem; margin-top:1rem;
}
.course-card {
  position:relative; display:flex; flex-direction:column; gap:.5rem;
  background:var(--surface); border:1px solid var(--line); border-radius:12px;
  padding:1.1rem 1.15rem 1.15rem 1.35rem; box-shadow:var(--shadow);
  transition:transform .15s ease, box-shadow .15s ease;
}
.course-card:hover { transform:translateY(-3px); box-shadow:0 16px 34px rgba(74,59,41,.16); }
.course-card::before {
  content:""; position:absolute; left:0; top:1rem; bottom:1rem; width:3px;
  border-radius:3px; background:var(--ac);
}
.course-card .ct { font-family:var(--serif); font-weight:700; font-size:1.1rem; color:var(--ink); }
.course-card .cm { color:var(--muted); font-size:.82rem; }
.course-card .crow { display:flex; align-items:center; gap:.5rem; flex-wrap:wrap; margin-top:auto; }
.course-card .crow .spacer { flex:1; }

.empty-state {
  text-align:center; padding:2.5rem 1rem; color:var(--muted);
}
.empty-state .icon { font-size:2.2rem; display:block; margin-bottom:.5rem; }

/* ===== hint 行 ===== */
.hint { font-size:.82em; color:var(--muted); margin:.2em 0 0; }

/* ===== dialog / modal ===== */
.modal-dialog { border:none; border-radius:12px; padding:1.4rem 1.6rem; max-width:520px; width:92vw;
  background:var(--paper); color:var(--ink); box-shadow:0 8px 32px rgba(0,0,0,.18); }
.modal-dialog::backdrop { background:rgba(0,0,0,.35); }
.modal-dialog h3 { font-family:var(--serif); color:var(--ac-deep); }
.modal-actions { display:flex; gap:.5rem; justify-content:flex-end; margin-top:.8rem; }

/* ===== 表格 ===== */
table {
  width:100%; border-collapse:separate; border-spacing:0; overflow:hidden;
  border:1px solid var(--line); border-radius:10px; background:var(--surface);
}
th, td { text-align:left; padding:.78rem .85rem; border-bottom:1px solid var(--line-soft); vertical-align:middle; }
th { color:#6b5d49; background:var(--surface-soft); font-weight:700; font-size:.86rem; white-space:nowrap; }
tr:last-child td { border-bottom:none; }
tr:hover td { background:var(--surface-soft); }

/* ===== 按鈕 ===== */
.btn {
  display:inline-flex; align-items:center; justify-content:center; min-height:2.35rem; gap:.35rem;
  background:var(--ac); color:#fff; border:1px solid transparent;
  padding:.48rem .9rem; border-radius:8px; cursor:pointer; text-decoration:none;
  font:inherit; font-weight:700; line-height:1.2;
  box-shadow:0 6px 16px rgba(74,59,41,.14);
  transition:background .15s ease, transform .15s ease, box-shadow .15s ease;
}
.btn:hover { background:var(--ac-deep); color:#fff; text-decoration:none; transform:translateY(-1px); }

/* ===== 標籤 / chip ===== */
.tag {
  display:inline-flex; align-items:center; min-height:1.6rem; padding:.18rem .6rem;
  border-radius:999px; background:var(--ac-soft); color:var(--ac-deep);
  font-size:.78rem; font-weight:700; white-space:nowrap;
}
.tag.warn { background:var(--warn-soft); color:var(--warn); }
.tag.ok { background:var(--ok-soft); color:var(--ok); }
.tag.role-teacher { background:#d4e8f7; color:#1a5276; }
.tag.role-ta { background:#d5f5e3; color:#1e7e34; }
.chipbtn {
  display:inline-flex; align-items:center; gap:.25rem; min-height:1.6rem; padding:.2rem .65rem;
  border-radius:999px; background:var(--ac-soft); color:var(--ac-deep); border:1px solid transparent;
  font:inherit; font-size:.78rem; font-weight:700; line-height:1.2; white-space:nowrap;
  cursor:pointer; text-decoration:none;
}
.chipbtn:hover { background:var(--ac); color:#fff; text-decoration:none; }
.chipbtn.danger { background:var(--danger-soft); color:var(--danger); }
.chipbtn.danger:hover { background:var(--danger); color:#fff; }
.row-actions { display:flex; gap:.5rem; flex-wrap:wrap; }

/* ===== 折疊標題 / 拖曳 ===== */
.csum { display:flex; align-items:center; gap:.45rem; cursor:pointer; list-style:none;
  font-family:var(--serif); font-size:1.1rem; font-weight:700; color:var(--ac-deep); margin:0;
  background:var(--ac-soft); padding:.55rem .8rem; border-radius:8px; }
.csum::-webkit-details-marker { display:none; }
.csum .caret { font-size:1em; color:var(--ac); transition:transform .15s ease; }
details[open] > .csum .caret { transform:rotate(90deg); }
.csum .ctitle { flex:1; min-width:0; }
.drag-handle { cursor:grab; user-select:none; touch-action:none; color:var(--muted); font-size:1.15em; line-height:1; }
.drag-handle:active { cursor:grabbing; }
.chapter-card.dragging { opacity:.45; }
.chapter-card.drag-over { outline:2px dashed var(--ac); outline-offset:2px; }

/* ===== 訊息條 ===== */
.msg { padding:.8rem 1rem; border-radius:10px; margin-bottom:.8rem; border:1px solid var(--line); background:var(--surface); }
.msg.success { background:var(--ok-soft); color:var(--ok); border-color:#c5d8c5; }
.msg.error { background:var(--danger-soft); color:var(--danger); border-color:#e6c2c7; }
.msg.info { background:var(--ac-soft); color:var(--ac-deep); border-color:var(--line); }

/* ===== Toast 彈窗 ===== */
#toast-container { position:fixed; top:30%; left:50%; transform:translateX(-50%); z-index:9999; display:flex; flex-direction:column; gap:.5rem; max-width:420px; width:90%; pointer-events:none; }
.toast {
  display:flex; align-items:center; gap:.6rem; padding:.8rem 1.2rem; border-radius:10px;
  border:1px solid var(--line); background:var(--surface); color:var(--ink);
  box-shadow:0 6px 24px rgba(0,0,0,.2); font-size:.95rem;
  animation:toast-in .35s ease; transition:opacity .4s ease; pointer-events:auto;
}
.toast button { background:none; border:none; font-size:1.2rem; cursor:pointer; color:var(--muted); padding:0 .2rem; line-height:1; }
.toast.success { background:var(--ok-soft); color:var(--ok); border-color:#c5d8c5; }
.toast.error { background:var(--danger-soft); color:var(--danger); border-color:#e6c2c7; }
.toast.info { background:var(--ac-soft); color:var(--ac-deep); border-color:var(--line); }
@keyframes toast-in { from { opacity:0; transform:scale(.9) translateY(-10px); } to { opacity:1; transform:scale(1) translateY(0); } }

/* ===== 文字 / 表單 ===== */
.muted { color:var(--muted); }
label { display:block; margin:.75rem 0 .25rem; color:#6b5d49; font-size:.9rem; font-weight:700; }
input, textarea, select {
  width:100%; padding:.62rem .7rem; border:1px solid var(--line); border-radius:8px;
  background:#fffdf8; color:var(--ink); font:inherit; line-height:1.35;
  transition:border-color .15s ease, box-shadow .15s ease;
}
input:focus, textarea:focus, select:focus { outline:none; border-color:var(--ac); box-shadow:0 0 0 3px var(--ac-soft); }
input[type=file]{ padding:.45rem; background:var(--surface-soft); }
input[type=checkbox]{ width:auto; }
textarea { resize:vertical; min-height:7rem; }
code { padding:.12rem .35rem; border-radius:6px; background:var(--surface-soft); color:var(--ac-deep); font-size:.92em; }
ul { padding-left:1.25rem; }
li + li { margin-top:.35rem; }

/* ===== Tabs ===== */
.tabs { display:flex; gap:.35rem; margin-top:1rem; padding:.25rem; flex-wrap:wrap;
  background:var(--surface-soft); border:1px solid var(--line); border-radius:10px; }
.tabs .tab { display:inline-flex; align-items:center; min-height:2.2rem; padding:.45rem .85rem;
  color:#6b5d49; border-radius:7px; text-decoration:none; font-weight:700; }
.tabs .tab.active { color:var(--ac-deep); background:var(--surface); box-shadow:0 1px 4px rgba(74,59,41,.12); }
.tabs .tab:hover { color:var(--ac-deep); background:var(--surface); text-decoration:none; }

.linkbtn { background:none; border:none; color:var(--danger); cursor:pointer; font:inherit; font-weight:700; padding:0; }
.linkbtn:hover { text-decoration:underline; }
form.inline { display:inline; }

/* ===== 成績摘要 ===== */
.score-summary { display:grid; grid-template-columns:minmax(220px, .9fr) minmax(0, 1.4fr); gap:1rem; align-items:start; }
.score-value { margin:.25rem 0; color:var(--ac-deep); font-family:var(--serif); font-size:2rem; font-weight:900; line-height:1.1; }
.metric-grid { display:grid; grid-template-columns:repeat(4, minmax(0, 1fr)); gap:.6rem; margin:.35rem 0 1rem; }
.metric { padding:.7rem .8rem; border:1px solid var(--line); border-radius:10px; background:var(--surface-soft); }
.metric .label { display:block; color:var(--muted); font-size:.78rem; font-weight:700; }
.metric .value { display:block; margin-top:.15rem; color:var(--ink); font-size:1.15rem; font-weight:800; }
.table-scroll { overflow-x:auto; }

/* ===== 響應式 ===== */
@media (max-width: 760px) {
  header { align-items:flex-start; flex-wrap:wrap; padding:.75rem 1rem; }
  header .spacer { display:none; }
  header nav { width:100%; order:3; }
  main { margin:1rem auto 2rem; padding:0 .75rem; }
  .card { padding:1rem; }
  table { display:block; overflow-x:auto; white-space:nowrap; }
  th, td { padding:.65rem .7rem; }
  .btn { width:auto; max-width:100%; }
  .score-summary { grid-template-columns:1fr; }
  .metric-grid { grid-template-columns:repeat(2, minmax(0, 1fr)); }
  .course-grid { grid-template-columns:1fr; }

  /* 標記 .rcard 的表格 → 手機改成堆疊卡片（取代橫向捲動）；每格 data-label 當欄名 */
  table.rcard { display:block; overflow:visible; white-space:normal; border:none; background:none; }
  table.rcard tbody, table.rcard tr, table.rcard td { display:block; width:auto; }
  table.rcard tr:has(th) { display:none; }
  table.rcard tr { border:1px solid var(--line); border-radius:10px; background:var(--surface); padding:.55rem .85rem; margin-bottom:.7rem; }
  table.rcard tr:hover td { background:none; }
  table.rcard td { display:flex; justify-content:space-between; align-items:baseline; gap:1rem; border:none; padding:.3rem 0; text-align:right; white-space:normal; }
  table.rcard td::before { content:attr(data-label); font-weight:700; color:var(--muted); font-size:.82rem; text-align:left; flex:0 0 auto; }
  table.rcard td:first-child { font-family:var(--serif); font-size:1.05rem; font-weight:700; color:var(--ac-deep); text-align:left; border-bottom:1px solid var(--line-soft); padding-bottom:.4rem; margin-bottom:.25rem; }
  table.rcard td:first-child::before { content:none; }
  table.rcard td.actions { justify-content:flex-start; padding-top:.5rem; }
  table.rcard td.actions::before { content:none; }

  /* .rcard.stack：表單型表格（評分頁）→ 標籤在上、輸入框佔整行 */
  table.rcard.stack td { display:block; text-align:left; padding:.4rem 0; }
  table.rcard.stack td::before { display:block; margin-bottom:.25rem; font-size:.8rem; }
  table.rcard.stack td:first-child::before { content:none; }
  table.rcard.stack td input[type="datetime-local"], table.rcard.stack td input[type="file"] { width:100%; }
}