/* 牛夫子錯題本 — 樣式（接在 style.css / theme-cow.css 後面載入） */
.wb-wrap { max-width: 980px; margin: 0 auto; padding: 18px 16px 90px; }
.wb-hero { display: flex; gap: 16px; align-items: flex-end; flex-wrap: wrap; margin: 6px 0 10px; }
.wb-hero img { width: 110px; height: auto; }
.wb-hero h1 { margin: 0; font-size: 1.7rem; color: var(--cow-wine); }
.wb-hero p { margin: 4px 0 0; color: var(--ink-soft); font-size: .95rem; }

/* 頂部摘要 */
.wb-strip { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin: 10px 0 4px; }
.wb-stat { border-top: 3px solid var(--cow-wine); padding: 6px 2px 0; }
.wb-stat b { display: block; font-size: 1.5rem; line-height: 1.2; font-variant-numeric: tabular-nums; }
.wb-stat span { font-size: .8rem; color: var(--ink-soft); }
.wb-stat.due { border-top-color: var(--amber); } .wb-stat.ok { border-top-color: var(--green); } .wb-stat.pink { border-top-color: var(--cow-pink); }

/* 分頁列 */
.wb-tabs { display: flex; gap: 6px; flex-wrap: wrap; position: sticky; top: 0; z-index: 6; background: var(--cow-cream, var(--bg)); padding: 10px 0; border-bottom: 2px dashed var(--cow-pink-line, var(--line)); margin-bottom: 12px; }
.wb-tabs a { border: 1.5px solid var(--line); border-radius: 999px; padding: 6px 14px; background: #fff; color: var(--ink); text-decoration: none; font-weight: 700; font-size: .95rem; }
.wb-tabs a:hover { border-color: var(--cow-wine); text-decoration: none; }
.wb-tabs a.on { background: var(--cow-wine); color: #fff; border-color: var(--cow-wine); }
.wb-tabs a .n { display: inline-block; min-width: 1.4em; padding: 0 5px; margin-left: 4px; border-radius: 999px; background: var(--cow-pink-soft, #fdebef); color: var(--cow-wine); font-size: .8rem; text-align: center; }
.wb-tabs a.on .n { background: rgba(255,255,255,.25); color: #fff; }
.wb-panel { display: none; } .wb-panel.on { display: block; }

/* 表單 */
.wb-card { background: #fff; border: 1.5px solid var(--line); border-radius: 18px; padding: 14px 18px; margin: 12px 0; box-shadow: var(--shadow); }
.wb-card h3 { margin: 0 0 8px; font-size: 1.05rem; color: var(--cow-wine); }
.wb-sec { font-weight: 800; margin: 18px 0 6px; display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.wb-sec small { font-weight: 400; color: var(--ink-soft); font-size: .82rem; }
.wb-row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin: 6px 0; }
.wb-row > label { font-weight: 700; color: var(--ink-soft); font-size: .92rem; }
.wb-grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 640px) { .wb-grid2 { grid-template-columns: 1fr; } .wb-strip { grid-template-columns: repeat(2, 1fr); } }
.wb-field { margin: 8px 0; }
.wb-field > label { display: block; font-weight: 700; font-size: .92rem; margin-bottom: 3px; }
.wb-field > label small { font-weight: 400; color: var(--ink-soft); }
input[type=text], input[type=date], input[type=email], select, textarea {
  font: inherit; font-size: .95rem; color: var(--ink); background: #fff; border: 1.5px solid var(--line); border-radius: 10px; padding: 7px 10px; width: 100%;
}
textarea { min-height: 72px; resize: vertical; line-height: 1.6; }
textarea.mono { font-family: Consolas, "Courier New", monospace; font-size: .85rem; }
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--cow-pink, #f7a8b8); box-shadow: 0 0 0 3px rgba(247,168,184,.25); }
.wb-btn { font: inherit; font-size: .92rem; font-weight: 700; cursor: pointer; border-radius: 10px; border: 1.5px solid var(--cow-wine); background: var(--cow-wine); color: #fff; padding: 7px 14px; }
.wb-btn:hover { filter: brightness(1.08); }
.wb-btn:disabled { opacity: .5; cursor: default; filter: none; }
.wb-btn.ghost { background: #fff; color: var(--cow-wine); }
.wb-btn.soft { background: var(--cow-pink-soft, #fdebef); color: var(--cow-wine); border-color: var(--cow-pink-line, #f6d2da); }
.wb-btn.sm { padding: 4px 10px; font-size: .84rem; }
.wb-btn.ok { background: var(--green); border-color: var(--green); }
.wb-btn.bad { background: #fff; color: var(--red); border-color: var(--red); }
.wb-btn.grey { background: #fff; color: var(--ink-soft); border-color: var(--line); font-weight: 400; }
.wb-note { font-size: .85rem; color: var(--ink-soft); line-height: 1.6; }
.wb-warn { background: var(--amber-soft); border: 1.5px solid #f3d9a4; border-radius: 10px; padding: 8px 12px; font-size: .9rem; margin: 8px 0; }
.wb-err { background: #fdf0f2; border: 1.5px solid #f3c2cb; color: var(--red); border-radius: 10px; padding: 8px 12px; font-size: .9rem; margin: 8px 0; }
.wb-ok { background: var(--green-soft); border: 1.5px solid #bfe3cf; border-radius: 10px; padding: 8px 12px; font-size: .9rem; margin: 8px 0; }

/* 照片區 */
.wb-photo { display: flex; gap: 14px; flex-wrap: wrap; align-items: flex-start; }
.wb-photo img { max-width: 260px; max-height: 220px; border-radius: 12px; border: 1.5px solid var(--line); }
.wb-drop { flex: 1 1 260px; border: 2px dashed var(--cow-pink-line, #f6d2da); border-radius: 14px; padding: 16px; text-align: center; color: var(--ink-soft); background: var(--cow-pink-soft, #fdebef); cursor: pointer; }
.wb-drop:hover { border-color: var(--cow-wine); }
.wb-drop input { display: none; }
.wb-busy { display: inline-block; width: 14px; height: 14px; border: 2px solid var(--cow-pink); border-top-color: var(--cow-wine); border-radius: 50%; animation: wbspin .8s linear infinite; vertical-align: -2px; margin-right: 6px; }
@keyframes wbspin { to { transform: rotate(360deg); } }

/* 選項膠囊 */
.wb-chips { display: flex; gap: 6px; flex-wrap: wrap; }
.wb-chip { border: 1.5px solid var(--line); border-radius: 999px; padding: 3px 11px; font-size: .86rem; cursor: pointer; background: #fff; user-select: none; }
.wb-chip:hover { border-color: var(--cow-wine); }
.wb-chip.on { background: var(--cow-wine); color: #fff; border-color: var(--cow-wine); }
.wb-chip small { opacity: .75; }
.wb-radio { display: grid; gap: 6px; }
.wb-radio label { display: flex; gap: 8px; align-items: flex-start; border: 1.5px solid var(--line); border-radius: 10px; padding: 6px 10px; cursor: pointer; font-size: .92rem; }
.wb-radio label.on { border-color: var(--cow-wine); background: var(--cow-pink-soft, #fdebef); }
.wb-radio label small { display: block; color: var(--ink-soft); font-size: .82rem; }
.wb-radio input { margin-top: 5px; }

/* 預覽與圖 */
.wb-preview { background: var(--cow-cream, #fbf6f0); border: 1.5px dashed var(--line); border-radius: 12px; padding: 10px 12px; min-height: 40px; font-size: .97rem; line-height: 1.8; white-space: normal; }
.wb-fig { margin: 8px 0; max-width: 100%; }
.wb-fig svg { max-width: 100%; height: auto; max-height: 320px; display: block; }
.wb-fig.sm svg { max-height: 200px; }

/* 列表 */
.wb-filters { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; margin: 4px 0 10px; }
.wb-filters select, .wb-filters input { width: auto; flex: 0 1 auto; }
.wb-filters input[type=text] { flex: 1 1 160px; }
.wb-day { font-weight: 800; color: var(--cow-wine); margin: 18px 0 6px; display: flex; gap: 8px; align-items: baseline; }
.wb-day small { color: var(--ink-soft); font-weight: 400; }
.wb-item { background: #fff; border: 1.5px solid var(--line); border-radius: 16px; padding: 10px 14px; margin: 8px 0; box-shadow: var(--shadow); }
.wb-item.graduated { opacity: .75; }
.wb-item.due, .wb-item.overdue { border-color: var(--amber); }
.wb-head { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; cursor: pointer; }
.wb-head .src { font-weight: 700; }
.wb-head .meta { color: var(--ink-soft); font-size: .85rem; }
.wb-tag { display: inline-block; border-radius: 999px; padding: 1px 9px; font-size: .78rem; font-weight: 700; background: var(--cow-pink-soft, #fdebef); color: var(--cow-wine); }
.wb-tag.kp { background: var(--blue-soft); color: var(--blue); }
.wb-tag.st-due, .wb-tag.st-overdue { background: var(--amber-soft); color: var(--amber); }
.wb-tag.st-graduated { background: var(--green-soft); color: var(--green); }
.wb-tag.st-waiting { background: #f1f1f1; color: var(--ink-soft); }
.wb-tag.st-noexam { background: var(--purple-soft); color: var(--purple); }
.wb-tag.err { background: #fff3f3; color: var(--red); font-weight: 500; }
.wb-head .sp { flex: 1; }
.wb-head input[type=checkbox] { width: 18px; height: 18px; }
.wb-body { margin-top: 8px; border-top: 1px dashed var(--line); padding-top: 8px; }
.wb-q { font-size: 1rem; line-height: 1.85; }
.wb-hid { display: none; } .wb-item.show-ans .wb-hid { display: block; }
.wb-sub { font-size: .86rem; font-weight: 800; color: var(--ink-soft); margin: 10px 0 2px; }
.wb-ans { background: var(--green-soft); border-radius: 10px; padding: 6px 10px; }
.wb-sol { background: var(--cow-cream, #fbf6f0); border-radius: 10px; padding: 6px 10px; }
.wb-actions { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 10px; }
.wb-hist { display: flex; gap: 4px; flex-wrap: wrap; align-items: center; font-size: .82rem; color: var(--ink-soft); }
.wb-hist i { display: inline-block; width: 20px; height: 20px; border-radius: 50%; text-align: center; line-height: 20px; font-style: normal; font-size: .75rem; background: #eee; }
.wb-hist i.ok { background: var(--green-soft); color: var(--green); } .wb-hist i.no { background: #fdf0f2; color: var(--red); }
.wb-stages { display: grid; grid-template-columns: repeat(6, 1fr); gap: 4px; margin: 6px 0; }
.wb-stages div.more { background: var(--purple-soft); color: var(--purple); }
.wb-key { background: var(--blue-soft); border-left: 4px solid var(--blue); border-radius: 8px; padding: 6px 10px; margin: 6px 0; font-size: .95rem; }
.wb-tag.st-more { background: var(--purple-soft); color: var(--purple); }
.wb-unit { font-weight: 800; color: var(--cow-wine); margin: 18px 0 6px; border-bottom: 2px dashed var(--cow-pink-line); }
.wb-unit small { color: var(--ink-soft); font-weight: 400; }
.wb-chip.gA { border-color: #b7c9e8; } .wb-chip.gB { border-color: #f3d9a4; } .wb-chip.gC { border-color: #f3c2cb; }
.wb-stages div { font-size: .74rem; text-align: center; padding: 4px 2px; border-radius: 8px; background: #f3f3f3; color: var(--ink-soft); }
.wb-stages div.done { background: var(--green-soft); color: var(--green); }
.wb-stages div.now { background: var(--amber-soft); color: var(--amber); font-weight: 800; }
.wb-var { border: 1.5px solid var(--cow-pink-line, #f6d2da); border-radius: 12px; padding: 8px 12px; margin: 8px 0; background: #fffafb; }
.wb-var .wb-sub { margin-top: 4px; }
.wb-empty { text-align: center; color: var(--ink-soft); padding: 30px 10px; }
.wb-empty img { width: 120px; height: auto; display: block; margin: 0 auto 6px; }
.wb-photo-view img { max-width: 100%; border-radius: 12px; border: 1.5px solid var(--line); }

/* 今日複習 */
.wb-today-how { background: var(--amber-soft); border-radius: 12px; padding: 8px 12px; font-size: .9rem; margin: 6px 0 10px; }
.wb-upcoming { font-size: .88rem; color: var(--ink-soft); }
.wb-upcoming b { color: var(--ink); }

/* 列印設定 */
.wb-print-opts { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 16px; }
@media (max-width: 640px) { .wb-print-opts { grid-template-columns: 1fr; } }
#printSheet { display: none; }

/* 帳號 */
.wb-cloud { background: #fff; border: 2px solid var(--line); border-radius: 14px; padding: 12px 14px; }
.wb-cloud .wb-row input { flex: 1 1 220px; width: auto; }
.wb-sync { font-size: .84rem; color: var(--ink-soft); }

/* ── 列印：只印 #printSheet ── */
@media print {
  body { background: #fff !important; background-image: none !important; font-size: 12.5pt; }
  .topbar, .wb-wrap > *:not(#printSheet) { display: none !important; }
  #printSheet { display: block !important; }
  .ps-head { display: flex; justify-content: space-between; border-bottom: 2px solid #000; padding-bottom: 4px; margin-bottom: 10px; font-weight: 700; }
  .ps-q { break-inside: avoid; page-break-inside: avoid; margin: 0 0 10px; }
  .ps-q .ps-t { font-weight: 700; margin-bottom: 2px; }
  .ps-q .ps-src { color: #555; font-size: .85em; font-weight: 400; }
  .ps-q .ps-fig svg { max-height: 60mm; max-width: 90mm; height: auto; }
  .ps-blank { border-bottom: 1px dotted #999; margin-top: 7mm; }
  .ps-space { border: 1px dashed #bbb; border-radius: 4px; }
  .ps-break { page-break-before: always; break-before: page; }
  .ps-ans { margin: 4px 0 8px; }
  .ps-ans .ps-sol { font-size: .9em; color: #333; }
  .katex-display { overflow: visible; }
}