/**
 * 文件分類介紹／文章自訂 HTML 區塊共用樣式
 * 由 includes/header.php 全站載入。
 *
 * 後台貼上 HTML 時只需貼 <div class="yt-root main_info">…</div> 內容，
 * 勿再內嵌 <style> 或 <script>（避免 WAF Forbidden）。
 * 樣式統一在此檔維護。
 */

.yt-root.main_info,
.yt-root {
  --yt-primary: #861a05;
  --yt-accent: #0d3b66;
  --yt-blue: #1f6feb;
  --yt-gold: #b08540;
  --yt-violet: #2a1257;
  --yt-ink: #1c1b1b;
  --yt-ink-soft: #5c5654;
  --yt-line: #ecd7d1;
  --yt-bg: #fff;
  --yt-bg-soft: #faf6f4;
  --yt-radius: 14px;
  --yt-shadow: 0 6px 22px rgba(25, 20, 19, 0.07);
  color: var(--yt-ink);
  font-family: "Segoe UI", "Microsoft JhengHei", sans-serif;
}

.yt-hero {
  position: relative;
  overflow: hidden;
  border-radius: 22px;
  padding: clamp(28px, 5vw, 52px) clamp(24px, 4vw, 48px);
  color: #fff;
  background:
    radial-gradient(900px 320px at 100% 0%, rgba(176, 133, 64, 0.28), transparent 60%),
    radial-gradient(700px 280px at 0% 100%, rgba(42, 18, 87, 0.25), transparent 55%),
    linear-gradient(135deg, #1a0d2b 0%, #5e1203 42%, #861a05 100%);
  box-shadow: 0 22px 50px rgba(94, 18, 3, 0.26);
  margin-bottom: clamp(24px, 4vw, 36px);
}
.yt-hero-kicker {
  display: inline-block;
  padding: 6px 14px;
  background: rgba(255,255,255,0.14);
  border: 1px solid rgba(255,255,255,0.28);
  border-radius: 999px;
  font-size: 12px;
  letter-spacing: 0.2em;
}
.yt-hero h1 {
  margin: 16px 0 10px;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  line-height: 1.15;
  letter-spacing: 0.04em;
}
.yt-hero-lead { margin: 0; max-width: 62ch; font-size: 15px; line-height: 1.85; opacity: 0.92; }
.yt-hero-meta { margin-top: 14px; font-size: 12.5px; opacity: 0.82; }
.yt-hero-stats { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.yt-hero-stat {
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.22);
  font-size: 12.5px;
  font-weight: 700;
}
.yt-hero-stat strong { font-family: "JetBrains Mono", Consolas, monospace; margin-right: 4px; }
.yt-hero-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.yt-hero-btn {
  display: inline-flex;
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
}
.yt-hero-btn-primary { background: #fff; color: var(--yt-primary); }
.yt-hero-btn-ghost { background: rgba(255,255,255,0.12); color: #fff; border: 1px solid rgba(255,255,255,0.35); }

.yt-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 28px;
  padding: 12px 14px;
  border-radius: var(--yt-radius);
  background: var(--yt-bg-soft);
  border: 1px solid var(--yt-line);
  position: sticky;
  top: 12px;
  z-index: 5;
}
.yt-nav-link {
  padding: 8px 14px;
  border-radius: 999px;
  color: var(--yt-ink-soft);
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
}
.yt-nav-link:hover,
.yt-nav-link.is-active {
  background: linear-gradient(135deg, var(--yt-primary), #b13a1f);
  color: #fff;
}

.yt-section { margin-bottom: clamp(36px, 5vw, 52px); scroll-margin-top: 80px; }
.yt-section-head {
  margin-bottom: 20px;
  padding-bottom: 14px;
  border-bottom: 2px solid var(--yt-line);
}
.yt-section-title { margin: 0; font-size: clamp(1.25rem, 2.5vw, 1.55rem); letter-spacing: 0.06em; }

.yt-highlight-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
}
.yt-highlight {
  padding: 20px;
  border-radius: var(--yt-radius);
  background: var(--yt-bg);
  border: 1px solid var(--yt-line);
  box-shadow: var(--yt-shadow);
}
.yt-highlight h3 { margin: 0 0 8px; font-size: 15px; color: var(--yt-primary); }
.yt-highlight p { margin: 0; font-size: 14px; line-height: 1.75; color: var(--yt-ink-soft); }

.yt-period-badge {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 10px 16px;
  margin-bottom: 18px;
  border-radius: 10px;
  background: color-mix(in srgb, var(--yt-primary) 10%, #fff);
  border: 1px solid color-mix(in srgb, var(--yt-primary) 28%, transparent);
  font-size: 14px;
  font-weight: 600;
}
.yt-period-badge strong { color: var(--yt-primary); }

.yt-two-col {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
}
.yt-panel {
  padding: 18px 20px;
  border-radius: var(--yt-radius);
  background: var(--yt-bg-soft);
  border: 1px solid var(--yt-line);
}
.yt-panel h3 { margin: 0 0 12px; font-size: 14px; color: var(--yt-ink-soft); }
.yt-checklist { margin: 0; padding-left: 1.2em; font-size: 14px; line-height: 1.75; }
.yt-checklist li + li { margin-top: 8px; }

.yt-criteria-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 12px;
  margin-top: 16px;
}
.yt-criteria-card {
  padding: 16px 18px;
  border-radius: var(--yt-radius);
  background: var(--yt-bg);
  border: 1px solid var(--yt-line);
  box-shadow: var(--yt-shadow);
  border-left: 4px solid var(--yt-cc, var(--yt-primary));
}
.yt-criteria-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px; height: 28px;
  border-radius: 8px;
  background: var(--yt-cc, var(--yt-primary));
  color: #fff;
  font-size: 13px;
  font-weight: 800;
  margin-bottom: 8px;
}
.yt-criteria-card p { margin: 0; font-size: 14px; line-height: 1.65; color: var(--yt-ink-soft); }

.yt-steps { display: flex; flex-direction: column; gap: 0; }
.yt-step-item {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 16px;
  padding-bottom: 24px;
  position: relative;
}
.yt-step-item:not(:last-child)::before {
  content: "";
  position: absolute;
  left: 23px; top: 48px; bottom: 0;
  width: 2px;
  background: var(--yt-line);
}
.yt-step-num {
  width: 48px; height: 48px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 18px; color: #fff;
  background: linear-gradient(135deg, var(--yt-violet), var(--yt-primary));
  z-index: 1;
}
.yt-step-body {
  padding: 16px 18px;
  border-radius: var(--yt-radius);
  background: var(--yt-bg);
  border: 1px solid var(--yt-line);
  box-shadow: var(--yt-shadow);
}
.yt-step-body h3 { margin: 0 0 8px; font-size: 16px; }
.yt-step-body p { margin: 0 0 10px; font-size: 14px; line-height: 1.7; color: var(--yt-ink-soft); }
.yt-step-link { font-size: 13px; font-weight: 700; color: var(--yt-blue); text-decoration: none; }
.yt-step-link:hover { text-decoration: underline; }

.yt-doc-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.yt-doc-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  border-radius: var(--yt-radius);
  background: var(--yt-bg);
  border: 1px solid var(--yt-line);
  box-shadow: var(--yt-shadow);
}
.yt-doc-num {
  flex-shrink: 0;
  width: 32px; height: 32px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--yt-accent), var(--yt-blue));
  color: #fff;
  font-size: 13px;
  font-weight: 800;
}
.yt-doc-item p { margin: 0; font-size: 14px; line-height: 1.7; color: var(--yt-ink-soft); }

.yt-notes {
  margin-top: 16px;
  padding: 14px 16px;
  border-radius: 10px;
  background: color-mix(in srgb, var(--yt-gold) 12%, #fff);
  border: 1px solid color-mix(in srgb, var(--yt-gold) 35%, transparent);
  font-size: 13px;
  line-height: 1.75;
  color: var(--yt-ink-soft);
}
.yt-notes ul { margin: 8px 0 0; padding-left: 1.2em; }
.yt-notes li + li { margin-top: 6px; }

.yt-flow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 18px;
  border-radius: var(--yt-radius);
  background: linear-gradient(160deg, color-mix(in srgb, var(--yt-violet) 6%, #fff), var(--yt-bg-soft));
  border: 1px solid var(--yt-line);
}
.yt-flow-step {
  padding: 10px 14px;
  border-radius: 10px;
  background: var(--yt-bg);
  border: 1px solid var(--yt-line);
  font-size: 13px;
  font-weight: 600;
  line-height: 1.5;
}
.yt-flow-arrow { color: var(--yt-primary); font-weight: 800; font-size: 16px; }

.yt-ext-link {
  display: inline-block;
  margin-top: 12px;
  font-size: 13px;
  font-weight: 700;
  color: var(--yt-primary);
  text-decoration: none;
}
.yt-ext-link:hover { text-decoration: underline; }

.yt-disclaimer {
  margin-top: 24px;
  padding: 12px 14px;
  border-radius: 10px;
  background: var(--yt-bg-soft);
  border: 1px dashed var(--yt-line);
  font-size: 12.5px;
  color: var(--yt-ink-soft);
}

.yt-flow--spaced { margin-top: 18px; }
.yt-disclaimer--compact { margin-top: 16px; }

/* ===== 課程大綱／鍵值表（inc/exchange.php 等） ===== */
.yt-kv-table-wrap {
  overflow-x: auto;
  border-radius: var(--yt-radius);
  border: 1px solid var(--yt-line);
  background: var(--yt-bg);
  box-shadow: var(--yt-shadow);
}
.yt-kv-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
.yt-kv-table th,
.yt-kv-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--yt-line);
  vertical-align: top;
}
.yt-kv-table th {
  width: min(220px, 34%);
  background: var(--yt-bg-soft);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--yt-accent);
  white-space: nowrap;
}
.yt-kv-table tbody tr:last-child th,
.yt-kv-table tbody tr:last-child td { border-bottom: 0; }
.yt-syllabus-meta {
  margin: 0 0 10px;
  font-size: 13px;
  font-weight: 700;
  color: var(--yt-primary);
}
.yt-syllabus-prose {
  font-size: 14px;
  line-height: 1.85;
  color: var(--yt-ink);
}
.yt-syllabus-prose p { margin: 0 0 12px; }
.yt-syllabus-prose p:last-child { margin-bottom: 0; }
.yt-syllabus-note {
  margin: 0 0 16px;
  font-size: 13px;
  color: var(--yt-ink-soft);
}
.yt-syllabus-muted {
  margin: 10px 0 0;
  font-size: 13px;
  color: var(--yt-ink-soft);
}

/* ===== 英文課程列表（inc/coursesineng.php） ===== */
.ce-course-section {
  margin-top: 28px;
}
.ce-course-section:first-of-type {
  margin-top: 8px;
}
.ce-course-section-head {
  margin-bottom: 14px;
  padding: 16px 18px;
  border-radius: var(--yt-radius);
  border: 1px solid var(--yt-line);
  background:
    radial-gradient(420px 160px at 100% 0%, color-mix(in srgb, var(--yt-primary) 10%, transparent), transparent 60%),
    var(--yt-bg);
  box-shadow: var(--yt-shadow);
}
.ce-course-section-head h2 {
  margin: 4px 0 0;
  color: var(--yt-ink);
  font-size: clamp(1.25rem, 2.4vw, 1.7rem);
  line-height: 1.25;
}
.ce-course-section-kicker {
  display: inline-flex;
  align-items: center;
  color: var(--yt-primary);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
}
.ce-tabs { margin-top: 8px; }
.ce-tab-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
  padding: 12px 14px;
  border-radius: var(--yt-radius);
  background: var(--yt-bg-soft);
  border: 1px solid var(--yt-line);
}
.ce-tab-btn {
  padding: 8px 16px;
  border: 1px solid transparent;
  border-radius: 999px;
  background: transparent;
  color: var(--yt-ink-soft);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background .15s ease, color .15s ease, border-color .15s ease;
}
.ce-tab-btn:hover { color: var(--yt-primary); border-color: var(--yt-line); background: #fff; }
.ce-tab-btn.is-active {
  background: linear-gradient(135deg, var(--yt-primary), #b13a1f);
  color: #fff;
  border-color: transparent;
}
.ce-tab-panel { display: none; }
.ce-tab-panel.is-active { display: block; }
.ce-dept-groups {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.ce-dept-group {
  border: 1px solid var(--yt-line);
  border-radius: var(--yt-radius);
  background: var(--yt-bg);
  box-shadow: var(--yt-shadow);
  overflow: hidden;
}
.ce-dept-group-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 18px;
  background: linear-gradient(135deg, color-mix(in srgb, var(--yt-primary) 8%, #fff), var(--yt-bg-soft));
  border-bottom: 1px solid var(--yt-line);
}
.ce-dept-group-title {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--yt-ink);
  line-height: 1.35;
}
.ce-dept-group-count {
  flex-shrink: 0;
  padding: 4px 10px;
  border-radius: 999px;
  background: #fff;
  border: 1px solid var(--yt-line);
  color: var(--yt-ink-soft);
  font-size: 12px;
  font-weight: 600;
}
.ce-dept-group .ce-course-table-wrap {
  border: 0;
  border-radius: 0;
  box-shadow: none;
}
.ce-dept-group .ce-course-table tbody tr:nth-child(odd) {
  background: #fff;
}
.ce-dept-group .ce-course-table tbody tr:nth-child(even) {
  background: var(--yt-bg-soft);
}
.ce-dept-group .ce-course-table tbody tr:hover {
  background: color-mix(in srgb, var(--yt-primary) 6%, #fff);
}
.ce-course-table-wrap {
  overflow-x: auto;
  border-radius: var(--yt-radius);
  border: 1px solid var(--yt-line);
  background: var(--yt-bg);
  box-shadow: var(--yt-shadow);
}
.ce-course-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
/* 英文課程列表三欄：Course No. 10% / Course Title 70% / Instructor 20% */
.ce-dept-group .ce-course-table {
  table-layout: fixed;
}
.ce-dept-group .ce-course-table th:nth-child(1),
.ce-dept-group .ce-course-table td:nth-child(1) {
  width: 10%;
  white-space: nowrap;
}
.ce-dept-group .ce-course-table th:nth-child(2),
.ce-dept-group .ce-course-table td:nth-child(2) {
  width: 70%;
}
.ce-dept-group .ce-course-table th:nth-child(3),
.ce-dept-group .ce-course-table td:nth-child(3) {
  width: 20%;
  word-break: break-word;
}
.ce-course-table th,
.ce-course-table td {
  padding: 12px 14px;
  text-align: left;
  border-bottom: 1px solid var(--yt-line);
  vertical-align: top;
}
.ce-course-table th {
  background: var(--yt-bg-soft);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--yt-ink-soft);
}
.ce-course-table tbody tr:last-child td { border-bottom: 0; }
.ce-course-title {
  font-weight: 700;
  color: var(--yt-ink);
  text-decoration: none;
}
.ce-course-title:hover { color: var(--yt-primary); text-decoration: underline; }
.ce-course-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid var(--yt-line);
  border-radius: 999px;
  background: #fff;
  color: var(--yt-primary);
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
}
.ce-course-toggle:hover { background: var(--yt-bg-soft); }
.ce-course-detail-row td {
  padding: 0;
  background: var(--yt-bg-soft);
}
.ce-course-detail {
  padding: 16px 18px 18px;
  border-top: 1px dashed var(--yt-line);
}
.ce-course-detail[hidden] { display: none; }
.ce-course-detail .article-prose {
  font-size: 14px;
  line-height: 1.8;
  color: var(--yt-ink);
}
.ce-attach-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}
.ce-attach-list a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 12px;
  border-radius: 8px;
  border: 1px solid var(--yt-line);
  background: #fff;
  color: var(--yt-accent);
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
}
.ce-attach-list a:hover { border-color: var(--yt-primary); color: var(--yt-primary); }
.ce-empty {
  padding: 28px 20px;
  border-radius: var(--yt-radius);
  background: var(--yt-bg-soft);
  border: 1px dashed var(--yt-line);
  color: var(--yt-ink-soft);
  text-align: center;
  font-size: 14px;
}
.ce-course-link {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border: 1px solid var(--yt-line);
  border-radius: 999px;
  background: #fff;
  color: var(--yt-primary);
  font-size: 12px;
  font-weight: 700;
  text-decoration: none;
}
.ce-course-link:hover { background: var(--yt-bg-soft); border-color: var(--yt-primary); }

/* ===== 英文課程詳情（eng_course.php） ===== */
/* 寬度比照 .container（min(1600px, 95%)）與 .article-layout */
.ce-detail-layout {
  display: grid;
  grid-template-columns: minmax(0, 4fr) minmax(0, 1fr);
  gap: 1.5rem;
  align-items: start;
}
.ce-detail-layout > .ce-detail-sheet,
.ce-detail-layout > .ce-detail-aside {
  min-width: 0;
}
.ce-detail-sheet {
  padding: clamp(20px, 3vw, 28px);
  border-radius: var(--yt-radius);
  border: 1px solid var(--yt-line);
  background: var(--yt-bg);
  box-shadow: var(--yt-shadow);
}
.ce-detail-header { margin-bottom: 18px; }
.ce-detail-title {
  margin: 12px 0 0;
  font-size: clamp(1.5rem, 3vw, 2rem);
  line-height: 1.25;
  letter-spacing: 0.02em;
}
.ce-detail-meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
  margin: 0 0 24px;
  padding: 14px 16px;
  border-radius: 12px;
  background: var(--yt-bg-soft);
  border: 1px solid var(--yt-line);
}
.ce-detail-meta-item { margin: 0; }
.ce-detail-meta dt {
  margin: 0 0 4px;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--yt-ink-soft);
}
.ce-detail-meta dd { margin: 0; font-size: 15px; font-weight: 700; color: var(--yt-ink); }
.ce-detail-section { margin-bottom: 24px; }
.ce-detail-section-title {
  margin: 0 0 12px;
  font-size: 1.05rem;
  color: var(--yt-accent);
  letter-spacing: 0.04em;
}
.ce-detail-prose { font-size: 15px; line-height: 1.85; }
.ce-attach-list--detail { margin-top: 0; }
.ce-attach-size { font-weight: 400; color: var(--yt-ink-soft); font-size: 12px; }
.ce-detail-back { margin: 8px 0 0; }
.ce-detail-aside { position: sticky; top: 16px; }
.ce-detail-aside-inner { padding: 16px 18px; }
.ce-detail-aside-title {
  margin: 0 0 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid #eee;
  font-size: 15px;
}
.ce-detail-related {
  margin: 0;
  padding: 0;
  list-style: none;
}
.ce-detail-related li + li { margin-top: 8px; }
.ce-detail-related a {
  display: block;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--yt-line);
  background: #fff;
  text-decoration: none;
  color: inherit;
  transition: border-color .15s ease, background .15s ease;
}
.ce-detail-related a:hover {
  border-color: var(--yt-primary);
  background: var(--yt-bg-soft);
}
.ce-detail-related-no {
  display: block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--yt-primary);
}
.ce-detail-related-title {
  display: block;
  margin-top: 4px;
  font-size: 14px;
  font-weight: 700;
  color: var(--yt-ink);
}
.ce-detail-related-dept {
  display: block;
  margin-top: 2px;
  font-size: 12px;
  color: var(--yt-ink-soft);
}
@media (max-width: 960px) {
  .ce-detail-layout { grid-template-columns: 1fr; }
  .ce-detail-aside { position: static; }
}