/*
 * NTUDENTSA 討論版 — 共用 design tokens
 * Spec §3.5
 *
 * `discus-*` prefix 跟其他 NTUDENTSA 樣式分隔。CSS variables 統一在 :root
 * 定義，quiz 那邊 React component 也引用同一份檔（複製過去或同步 token）。
 */

:root {
  --discus-bg:        #FBFAF6;
  --discus-card:      #FFFFFF;
  --discus-card-hi:   #F8F5EC;
  --discus-border:    #ECE6D6;
  --discus-meta:      #9098A0;
  --discus-link:      #0F4C5C;
  --discus-anon-bg:   #C8C2B0;
  --discus-vote:      #C8923A;
  --discus-danger:    #C04B3D;
  --discus-text:      #1A2330;
}

.discus-page {
  background: var(--discus-bg);
  padding: 32px 0 80px;
  color: var(--discus-text);
}

/* ───── Alerts ───── */
.discus-alert {
  padding: 12px 16px;
  border-radius: 4px;
  font-size: 14px;
  margin-bottom: 16px;
}
.discus-alert--warn {
  background: #FFF4D6;
  border: 1px solid #E0B040;
}
.discus-alert--err {
  background: #FCEDE9;
  border: 1px solid var(--discus-danger);
  color: var(--discus-danger);
}
.discus-mute-banner {
  background: var(--discus-card-hi);
  border: 1px solid var(--discus-border);
  padding: 12px 16px;
  border-radius: 4px;
  color: var(--discus-meta);
  font-size: 14px;
}

/* ───── 分類卡 ───── */
.discus-categories { margin-bottom: 40px; }
.discus-cat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
}
.discus-cat-card {
  display: flex;
  gap: 12px;
  padding: 16px;
  background: var(--discus-card);
  border: 1px solid var(--discus-border);
  border-radius: 4px;
  text-decoration: none;
  color: var(--discus-text);
  transition: background .15s;
  /* 防全域樣式（譬如某些 theme 對 a 設 line-height: 1）讓內文重疊 */
  line-height: 1.5;
}
.discus-cat-card:hover { background: var(--discus-card-hi); }
.discus-cat-icon { font-size: 28px; flex-shrink: 0; line-height: 1; }
.discus-cat-text { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.discus-cat-name { font-weight: 600; line-height: 1.4; }
.discus-cat-desc { color: var(--discus-meta); font-size: 13px; line-height: 1.5; margin: 0; }

/* ───── Thread list ───── */
.discus-thread-list {
  list-style: none;
  padding: 0;
  margin: 0;
  background: var(--discus-card);
  border: 1px solid var(--discus-border);
  border-radius: 4px;
  overflow: hidden;
}
.discus-thread-row {
  display: flex;
  gap: 12px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--discus-border);
  transition: background .15s;
  /* 讓 title ::before overlay 撐滿整列 → 整個 row 可點 */
  position: relative;
}
.discus-thread-row:last-child { border-bottom: none; }
.discus-thread-row:hover { background: var(--discus-card-hi); }
.discus-thread-row-cat { font-size: 22px; flex-shrink: 0; line-height: 1; }
.discus-thread-row-body {
  /* parent theme 的全域 `a { line-height: 1 }` 會讓 title + meta 疊在一起，
     強制 column flex + 自己控制 line-height */
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
  line-height: 1.5;
}
.discus-thread-row-title {
  font-weight: 600;
  font-size: 16px;
  color: var(--discus-text);
  text-decoration: none;
  display: block;
  line-height: 1.4;
  /* 用 ::before pseudo-element overlay 撐滿父 row、所以整列點任何地方都觸發
     這個 link 的 navigate（cat icon / meta / 空白處皆可）*/
  position: static;
}
.discus-thread-row-title::before {
  content: "";
  position: absolute;
  inset: 0;
}
.discus-thread-row-title:hover { color: var(--discus-link); }
.discus-thread-row-meta { color: var(--discus-meta); font-size: 12px; line-height: 1.5; }

/* ───── 單串詳情 ───── */
.discus-thread-card {
  background: var(--discus-card);
  border: 1px solid var(--discus-border);
  border-radius: 4px;
  padding: 24px;
  margin-bottom: 24px;
}
.discus-thread-title {
  margin: 0 0 8px;
  font-size: 24px;
  font-weight: 600;
}
.discus-meta {
  color: var(--discus-meta);
  font-size: 13px;
  margin-bottom: 16px;
}
.discus-body {
  font-size: 15px;
  line-height: 1.75;
  white-space: pre-wrap;
  word-wrap: break-word;
  overflow-wrap: anywhere;
}

/* ───── 巢狀 comments ───── */
.discus-comments {
  list-style: none;
  padding-left: 0;
  margin: 0;
}
.discus-comments .discus-comments {
  /* 子層縮排 */
  margin-left: 24px;
  border-left: 2px solid var(--discus-border);
  padding-left: 16px;
  margin-top: 4px;
}

.discus-comment {
  background: var(--discus-card);
  border: 1px solid var(--discus-border);
  border-radius: 4px;
  padding: 12px 16px;
  margin-bottom: 8px;
}
.discus-comment.is-deleted .discus-comment-body,
.discus-thread-card.is-deleted .discus-body {
  color: var(--discus-meta);
  font-style: italic;
}
.discus-thread-card.is-deleted .discus-thread-title {
  color: var(--discus-meta);
  font-style: italic;
}
.discus-comment-meta {
  font-size: 12px;
  color: var(--discus-meta);
  margin-bottom: 8px;
}
.discus-comment-meta strong { color: var(--discus-text); }
.discus-edited {
  color: var(--discus-meta);
  font-style: italic;
  margin-left: 6px;
}
.discus-comment-body {
  font-size: 14px;
  line-height: 1.7;
  white-space: pre-wrap;
  word-wrap: break-word;
  overflow-wrap: anywhere;
}
.discus-comment-actions {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}
.discus-action-btn {
  background: none;
  border: 1px solid var(--discus-border);
  padding: 4px 10px;
  font-size: 12px;
  border-radius: 2px;
  cursor: pointer;
  color: var(--discus-meta);
  font-family: inherit;
}
.discus-action-btn:hover { color: var(--discus-link); border-color: var(--discus-link); }
.discus-action-danger:hover { color: var(--discus-danger); border-color: var(--discus-danger); }
.discus-inline-form {
  display: inline;
  margin: 0;
}

/* ───── Vote button ───── */
.discus-vote-form { display: inline; }
.discus-vote-btn {
  background: transparent;
  border: 1px solid var(--discus-border);
  padding: 4px 10px;
  border-radius: 2px;
  cursor: pointer;
  font-size: 12px;
  color: var(--discus-meta);
  font-family: inherit;
  transition: all .15s;
}
.discus-vote-btn:hover:not(:disabled) {
  border-color: var(--discus-vote);
  color: var(--discus-vote);
}
.discus-vote-btn.is-voted {
  background: var(--discus-vote);
  color: #fff;
  border-color: var(--discus-vote);
}
.discus-vote-btn:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

.discus-thread-actions {
  display: flex;
  gap: 8px;
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--discus-border);
  align-items: center;
}

/* ───── 圖片附件 picker — JS-driven AJAX upload，paste/pick → immediate upload ───── */
.discus-img-picker {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 13px;
}
.discus-img-add-label {
  display: inline-block;
  color: var(--discus-link);
  cursor: pointer;
  font-size: 13px;
  text-decoration: underline;
  align-self: flex-start;
}
.discus-img-add-label:hover { color: var(--discus-vote); }
.discus-img-tray {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.discus-img-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--discus-border);
  background: var(--discus-bg);
  padding: 4px 6px;
  border-radius: 4px;
  font-size: 12px;
  max-width: 260px;
}
.discus-img-chip.is-error { border-color: var(--discus-danger); }
.discus-img-chip img {
  width: 36px;
  height: 36px;
  object-fit: cover;
  border-radius: 3px;
  display: block;
}
.discus-img-chip-meta {
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.discus-img-chip-name {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 160px;
}
.discus-img-chip-status {
  font-size: 11px;
  color: var(--discus-meta);
}
.discus-img-chip-x {
  background: none;
  border: 0;
  color: var(--discus-meta);
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
  padding: 0 2px;
}
.discus-img-chip-x:hover { color: var(--discus-danger); }
.discus-comment-images {
  margin-top: 8px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 6px;
  max-width: 480px;
}
.discus-comment-images .discus-image-link {
  display: block;
  border: 1px solid var(--discus-border);
  border-radius: 4px;
  overflow: hidden;
  background: var(--discus-bg);
}
.discus-comment-images img {
  display: block;
  width: 100%;
  height: 120px;
  object-fit: cover;
}
.discus-comment-images .discus-image-link:hover {
  border-color: var(--discus-link);
}

/* ───── 深度色階 + mobile 縮減 ───── */
@media (max-width: 768px) {
  .discus-comments .discus-comments {
    margin-left: 12px;
    padding-left: 8px;
  }
}

/* ───── 摺疊（depth 4+）— JS toggle，see forum.js ───── */
.discus-toggle-cb { display: none; }
.discus-expand-label {
  display: inline-block;
  margin: 6px 0 6px 20px;
  padding: 4px 12px;
  font-size: 12px;
  color: var(--discus-meta);
  border: 1px dashed var(--discus-border);
  border-radius: 2px;
  cursor: pointer;
  font-family: inherit;
  user-select: none;
  background: var(--discus-bg);
}
.discus-expand-label:hover {
  color: var(--discus-link);
  border-color: var(--discus-link);
}
.discus-collapsible {
  display: none;
}
.discus-collapsible.is-open { display: block; }

/* ───── Forms ───── */
.discus-form {
  background: var(--discus-card);
  border: 1px solid var(--discus-border);
  border-radius: 4px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 720px;
}
.discus-form-inline {
  margin-top: 8px;
}
.discus-reply-form {
  margin-top: 8px;
}
.discus-form-field {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 14px;
}
.discus-form-field > span:first-child {
  color: var(--discus-meta);
  font-size: 13px;
}
.discus-form-field input,
.discus-form-field textarea,
.discus-form-field select,
.discus-form textarea {
  border: 1px solid var(--discus-border);
  padding: 8px 10px;
  background: #fff;
  font-family: inherit;
  font-size: 14px;
  color: var(--discus-text);
}
.discus-form-field textarea,
.discus-form textarea {
  resize: vertical;
  min-height: 80px;
  width: 100%;
  box-sizing: border-box;
}
.discus-form-checkbox {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--discus-meta);
  cursor: pointer;
}
.discus-form-checkbox input { margin: 0; }
.discus-form-actions {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
}

.discus-reply-form-wrap {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--discus-border);
}
.discus-section-h {
  font-size: 16px;
  margin: 0 0 12px;
  color: var(--discus-text);
}
.discus-empty {
  text-align: center;
  padding: 40px;
  color: var(--discus-meta);
}