/* =========================================================
   雲端教室 — 頁面外框樣式
   （文章內文的樣式在 article.css）
   ========================================================= */

/* ---------- 分頁列 ---------- */
.cls-tabs { background: var(--bg); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.cls-tabs .wrap { display: flex; justify-content: space-between; align-items: flex-end; gap: 24px; flex-wrap: wrap; }
.cls-tabs nav { display: flex; gap: 38px; flex-wrap: wrap; }
.cls-tabs a {
  display: block; text-align: center; padding: 18px 0 0;
  border-bottom: 2px solid transparent; color: var(--ink-soft);
}
.cls-tabs a b { display: block; font-family: var(--serif); font-size: 16px; font-weight: 400; letter-spacing: 2px; }
.cls-tabs a span { display: block; font-size: 8.5px; letter-spacing: 2px; color: var(--ink-muted); margin: 4px 0 8px; }
.cls-tabs a.is-active { color: var(--ink); border-bottom-color: var(--theme); }
.cls-tabs .cls-search {
  margin-bottom: 16px; display: inline-flex; align-items: center; gap: 8px;
  background: var(--surface); border: 1px solid var(--line); border-radius: 999px;
  padding: 8px 14px; font-size: 12.5px; color: var(--ink-muted);
}

/* ---------- 左目錄 + 右內容 ---------- */
.cls-body { display: grid; grid-template-columns: 280px 1fr; gap: 56px; align-items: start; padding: 64px 0 88px; }
.cls-side { display: grid; gap: 26px; position: sticky; top: 24px; }
.cls-card { background: var(--surface); border: 1px solid var(--line); border-radius: 3px; padding: 26px 24px 20px; }
.cls-card__kicker { font-size: 10.5px; letter-spacing: 4px; color: var(--accent); margin: 0 0 16px; }
.cls-card__title { font-family: var(--serif); font-size: 20px; font-weight: 400; letter-spacing: 3px; margin: 0 0 16px; }

.cls-index { display: grid; }
.cls-index a {
  display: grid; grid-template-columns: auto 1fr auto; gap: 12px; align-items: start;
  padding: 12px 0; border-top: 1px solid var(--line); color: var(--ink-soft);
}
.cls-index a:first-child { border-top: 0; }
.cls-index .n { font-family: var(--serif); font-size: 13px; color: var(--gold); }
.cls-index .t { font-size: 13px; line-height: 1.5; }
.cls-index .s { display: block; font-size: 11px; color: var(--ink-muted); margin-top: 4px; }
.cls-index .c { font-size: 12px; color: var(--ink-muted); }
.cls-index a.is-active { color: var(--accent-deep); }
.cls-index a.is-active .c { color: var(--accent-deep); }
.cls-index a.is-todo { color: var(--ink-muted); }

.cls-card--dark { background: var(--accent-deep); border-color: var(--accent-deep); color: #fff; }
.cls-card--dark .cls-card__kicker { color: rgba(255,255,255,.55); }
.cls-card--dark .cls-card__title { color: #fff; }
.cls-card--dark p { margin: 0; font-size: 12px; line-height: 1.9; color: rgba(255,255,255,.72); white-space: pre-line; }
.cls-card--dark .row { display: grid; grid-template-columns: 34px 1fr; gap: 10px; padding: 10px 0; border-top: 1px solid rgba(255,255,255,.18); align-items: center; }
.cls-card--dark .row b { font-size: 10.5px; font-weight: 400; color: var(--gold); }
.cls-card--dark .row span { font-family: var(--serif); font-size: 15px; letter-spacing: 1px; color: rgba(255,255,255,.9); }

/* 深色卡片裡的目錄（四部宗義） */
.cls-card--dark .cls-index a {
  grid-template-columns: 34px 1fr auto; align-items: center;
  color: rgba(255,255,255,.9); border-top-color: rgba(255,255,255,.18);
}
.cls-card--dark .cls-index .n { font-size: 10.5px; }
.cls-card--dark .cls-index .t { font-family: var(--serif); font-size: 15px; letter-spacing: 1px; }
.cls-card--dark .cls-index .c { color: rgba(255,255,255,.5); }
.cls-card--dark .cls-index a.is-active,
.cls-card--dark .cls-index a.is-active .c { color: var(--gold); }

.cls-card--soft { background: var(--surface-soft); border-color: transparent; }
.cls-card--soft p { margin: 0; font-size: 12.5px; line-height: 1.95; color: var(--ink-soft); }
.cls-author { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.cls-author .mark { width: 40px; height: 40px; border-radius: 50%; background: var(--maroon); color: #fff; display: grid; place-items: center; font-family: var(--serif); font-size: 17px; }
.cls-author b { display: block; font-family: var(--serif); font-size: 17px; font-weight: 400; letter-spacing: 2px; }
.cls-author span { font-size: 9.5px; letter-spacing: 1.4px; color: var(--ink-muted); }

/* ---------- 入口頁：五個主題 ---------- */
.cls-hub { display: grid; grid-template-columns: 812px 1fr; gap: 28px; align-items: start; }
.cls-hub--row { grid-template-columns: repeat(3, 1fr); margin-top: 28px; }
.cls-topic {
  display: block; background: var(--bg); border: 1px solid var(--line); border-radius: 3px;
  padding: 30px 30px 26px; height: 100%; color: inherit;
}
.cls-topic__top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 18px; }
.cls-topic__num { font-family: var(--serif); font-size: 22px; color: var(--gold); }
.cls-topic__ico { width: 38px; height: 38px; border-radius: 50%; background: var(--accent-soft); color: var(--accent-deep); display: grid; place-items: center; font-size: 16px; }
.cls-topic h3 { font-family: var(--serif); font-size: 21px; font-weight: 400; letter-spacing: 2px; line-height: 1.4; margin: 0 0 7px; }
.cls-topic .en { font-size: 11px; letter-spacing: 1.4px; color: var(--ink-muted); margin: 0 0 14px; }
.cls-topic p { font-size: 13px; line-height: 1.9; color: var(--ink-soft); margin: 0; }
.cls-topic__foot { display: flex; justify-content: space-between; align-items: center; margin-top: 18px; padding-top: 14px; border-top: 1px solid var(--line); font-size: 11.5px; color: var(--ink-muted); }
.cls-topic__foot em { font-style: normal; color: var(--accent-deep); font-size: 12.5px; }

.cls-topic--feature { background: var(--accent-deep); border-color: var(--accent-deep); color: #fff; padding: 34px 36px 32px; }
.cls-topic--feature h3 { font-size: 28px; letter-spacing: 3px; }
.cls-topic--feature .en, .cls-topic--feature p { color: rgba(255,255,255,.82); }
.cls-topic--feature .cls-topic__ico { background: rgba(255,255,255,.12); color: #fff; }
.cls-topic--feature .cls-topic__foot { border-top-color: rgba(255,255,255,.18); color: rgba(255,255,255,.55); }
.cls-topic--feature .cls-topic__foot em { background: var(--gold); color: #2c2823; border-radius: 999px; padding: 9px 18px; }
.cls-quote-mini { border-left: 2px solid rgba(255,255,255,.2); padding-left: 18px; margin: 22px 0 0; }
.cls-quote-mini p { font-family: var(--serif); font-size: 16px; letter-spacing: 1px; color: #fff; margin: 0 0 8px; }
.cls-quote-mini span { font-size: 11px; letter-spacing: 1.2px; color: rgba(255,255,255,.55); }

/* ---------- 影音課程 ---------- */
.cls-videos { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.cls-vcard { display: block; background: var(--bg); border: 1px solid var(--line); border-radius: 3px; overflow: hidden; color: inherit; }
.cls-vcard__thumb { position: relative; aspect-ratio: 16 / 9; background: var(--ink) center/cover no-repeat; display: grid; place-items: center; }
.cls-vcard__thumb i { width: 56px; height: 56px; border-radius: 50%; background: rgba(255,255,255,.95); color: var(--maroon); display: grid; place-items: center; font-style: normal; font-size: 18px; }
.cls-vcard__info { padding: 20px 22px 22px; }
.cls-vcard h4 { font-family: var(--serif); font-size: 17px; font-weight: 400; letter-spacing: .8px; line-height: 1.55; margin: 0 0 9px; }
.cls-vcard .by { font-size: 12.5px; color: var(--ink-soft); margin: 0; }
.cls-vcard .id { display: block; margin-top: 10px; padding-top: 10px; border-top: 1px solid var(--line); font-size: 11px; color: var(--ink-muted); }
.cls-classes { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; align-items: start; }
.cls-class { background: var(--surface); border: 1px solid var(--line); border-radius: 3px; padding: 36px 36px 32px; }
.cls-class__head { display: flex; align-items: center; gap: 14px; padding-bottom: 18px; border-bottom: 1px solid var(--line); margin-bottom: 22px; }
.cls-class__head b { font-family: var(--serif); font-size: 20px; font-weight: 400; color: var(--gold); }
.cls-class__head h3 { font-family: var(--serif); font-size: 24px; font-weight: 400; letter-spacing: 2.5px; margin: 0; }
.cls-btn { display: inline-flex; align-items: center; gap: 8px; border-radius: 999px; padding: 10px 20px; font-size: 13px; letter-spacing: .8px; margin-top: 22px; }
.cls-btn--solid { background: var(--maroon); color: #fff; }
.cls-btn--ghost { background: var(--bg); border: 1px solid var(--line); color: var(--ink-muted); }

/* ---------- 學習日誌主題 ---------- */
.cls-hero { background: var(--surface); padding: 60px 0; }
.cls-hero__inner { display: grid; grid-template-columns: 600px 1fr; gap: 56px; align-items: center; }
.stats .stat span { white-space: nowrap; }
.cls-hero img { width: 100%; height: 400px; object-fit: cover; border-radius: 3px; }
.cls-hero .kick { font-size: 11px; letter-spacing: 3.5px; color: var(--jade); margin: 0 0 16px; }
.cls-hero h2 { font-family: var(--serif); font-size: 34px; font-weight: 400; letter-spacing: 6px; margin: 0 0 16px; }
.cls-hero p { font-size: 14px; line-height: 2.1; color: var(--ink-soft); margin: 0 0 16px; }
.cls-hero .meta { font-size: 12px; color: var(--ink-muted); }

/* ---------- 空狀態 ---------- */
.cls-empty { background: var(--surface); border: 1px solid var(--line); border-radius: 3px; padding: 70px 40px 74px; text-align: center; }
.cls-empty i { width: 46px; height: 46px; border-radius: 50%; background: var(--surface-soft); color: var(--ink-muted); display: inline-grid; place-items: center; font-style: normal; margin-bottom: 14px; }
.cls-empty h4 { font-family: var(--serif); font-size: 19px; font-weight: 400; letter-spacing: 2px; color: var(--ink-soft); margin: 0 0 12px; }
.cls-empty p { max-width: 460px; margin: 0 auto; font-size: 13px; line-height: 2; color: var(--ink-muted); }

/* ---------- 樣式表示範頁 ---------- */
.sg-item { border-top: 1px solid var(--line); padding: 40px 0 0; margin-top: 40px; }
.sg-item:first-child { border-top: 0; margin-top: 0; padding-top: 0; }
.sg-head { display: flex; align-items: baseline; gap: 14px; flex-wrap: wrap; margin-bottom: 18px; }
.sg-head h3 { font-family: var(--serif); font-size: 20px; font-weight: 400; letter-spacing: 2px; margin: 0; }
.sg-head code { background: var(--surface-soft); border-radius: 3px; padding: 3px 9px; font-size: 12px; color: var(--accent-deep); }
.sg-head span { font-size: 12.5px; color: var(--ink-muted); }

@media (max-width: 1100px) {
  .cls-hub, .cls-hero__inner { grid-template-columns: 1fr; }
  .cls-hub--row, .cls-videos { grid-template-columns: repeat(2, 1fr); }
  .cls-classes { grid-template-columns: 1fr; }
}
@media (max-width: 900px) {
  .cls-body { grid-template-columns: 1fr; gap: 20px; padding: 28px 0 40px; }
  .cls-side { position: static; }
  .cls-hub--row, .cls-videos { grid-template-columns: 1fr; }
  .cls-tabs nav { gap: 18px; }
  .cls-tabs a { padding-top: 12px; }
  .cls-tabs a b { font-size: 14px; letter-spacing: 1px; }
  .cls-tabs a span { display: none; }
  .cls-hero { padding: 32px 0; gap: 20px; }
  .cls-hero img { height: 220px; }
  .cls-hero h2 { font-size: 28px; letter-spacing: 4px; }
  .cls-topic--feature { padding: 26px 22px 22px; }
  .cls-topic--feature h3 { font-size: 21px; }
  .cls-class { padding: 26px 22px 24px; }
}