/* ===========================================================================
   HappySchool — Goodschool 文章專用樣式
   ===========================================================================
   設計原則：
   - 視覺明顯區隔：橘色 attribution banner + 虛線邊框 + 淡橘底
   - 正文一字不改：white-space: pre-wrap 保留原始段落
   - 與原生 HappySchool YouTube-style UI 統一色系
   =========================================================================== */

:root {
  --gs-accent: #ff6b1a;
  --gs-accent-soft: rgba(255, 107, 26, 0.08);
  --gs-border: #ff6b1a;
}

[data-theme="dark"] {
  --gs-accent: #ff8c4a;
  --gs-accent-soft: rgba(255, 140, 74, 0.12);
  --gs-border: #ff8c4a;
}

/* ---- Index page ---- */
.page-gs-index .page-head {
  text-align: center;
  padding: 32px 0 24px;
}
.page-gs-index .page-title {
  font-size: 2rem;
  margin: 0 0 12px;
  font-weight: 700;
}
.page-gs-index .page-subtitle {
  font-size: 1rem;
  color: var(--text-secondary, #555);
  max-width: 720px;
  margin: 0 auto 16px;
  line-height: 1.6;
}
.page-gs-index .page-meta {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}
.gs-meta-pill {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  background: var(--surface-1, #f4f4f4);
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
}

.gs-filter {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 0 0 28px;
  justify-content: center;
}
.gs-filter-pill {
  display: inline-block;
  padding: 8px 18px;
  border-radius: 999px;
  background: var(--surface-1, #f4f4f4);
  color: var(--text-primary, #222);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.15s ease;
  border: 2px solid transparent;
}
.gs-filter-pill:hover {
  background: var(--gs-accent-soft);
}
.gs-filter-pill.is-active {
  background: var(--gs-accent);
  color: #fff;
  border-color: var(--gs-accent);
}

/* L-2: view switch (依時間 / 依學校) */
.gs-view-switch {
  display: flex;
  gap: 6px;
  margin: 12px 0 20px;
  padding-bottom: 8px;
  border-bottom: 1px dashed #e0e0e0;
}
[data-theme="dark"] .gs-view-switch {
  border-bottom-color: #3a3a3a;
}
.gs-view-pill {
  padding: 6px 14px;
  border-radius: 16px;
  background: transparent;
  color: #666;
  font-size: 14px;
  text-decoration: none;
  border: 1px solid transparent;
  transition: all 0.15s;
}
.gs-view-pill:hover {
  background: rgba(255, 107, 26, 0.08);
  color: var(--gs-accent);
}
.gs-view-pill.is-active {
  background: rgba(255, 107, 26, 0.12);
  color: var(--gs-accent);
  border-color: var(--gs-accent);
  font-weight: 600;
}

/* L-2: by-school view groups */
.gs-schools {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
  padding: 8px 0 40px;
}
.gs-school-group {
  background: #fff;
  border: 1px solid #e8e8e8;
  border-radius: 12px;
  padding: 16px 18px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}
[data-theme="dark"] .gs-school-group {
  background: #1e1e1e;
  border-color: #333;
}
.gs-school-name {
  margin: 0 0 10px;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.4;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}
.gs-school-name a {
  color: var(--gs-accent);
  text-decoration: none;
}
.gs-school-name a:hover { text-decoration: underline; }
.gs-school-count {
  font-size: 12px;
  color: #888;
  background: #f5f5f5;
  padding: 2px 8px;
  border-radius: 10px;
}
[data-theme="dark"] .gs-school-count { background: #2a2a2a; }
.gs-school-articles {
  list-style: none;
  margin: 0;
  padding: 0;
}
.gs-school-articles li {
  border-top: 1px dashed #eee;
  padding: 6px 0;
}
.gs-school-articles li:first-child { border-top: none; }
.gs-school-articles a {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
  gap: 2px;
}
.gs-school-articles a:hover .gs-school-article-title { color: var(--gs-accent); }
.gs-school-article-ym {
  font-size: 12px;
  color: #888;
}
.gs-school-article-title {
  font-size: 14px;
  line-height: 1.4;
}

.gs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  padding: 8px 0 40px;
}

.gs-card {
  background: var(--card-bg, #fff);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--card-shadow, 0 1px 3px rgba(0, 0, 0, 0.08));
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  display: flex;
  flex-direction: column;
}
.gs-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--card-shadow-hover, 0 4px 12px rgba(0, 0, 0, 0.12));
}

.gs-card-media {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--surface-2, #eaeaea);
}
.gs-card-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.gs-card-noimg {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  font-size: 3rem;
  color: var(--text-tertiary, #999);
}

.gs-card-tier {
  position: absolute;
  top: 10px;
  left: 10px;
  padding: 3px 10px;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  color: #fff;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
}
.gs-card-tier.tier-kg        { background: rgba(255, 107, 26, 0.9); }
.gs-card-tier.tier-primary   { background: rgba(76, 175, 80, 0.9); }
.gs-card-tier.tier-secondary { background: rgba(33, 150, 243, 0.9); }

.gs-card-body {
  padding: 14px 16px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
}
.gs-card-title {
  margin: 0;
  font-size: 1.05rem;
  line-height: 1.4;
  font-weight: 600;
}
.gs-card-title a {
  color: var(--text-primary, #222);
  text-decoration: none;
}
.gs-card-title a:hover {
  color: var(--gs-accent);
}
.gs-card-school {
  margin: 0;
  font-size: 0.85rem;
  color: var(--text-secondary, #666);
}
.gs-card-school-link {
  color: var(--text-secondary, #666);
  text-decoration: none;
}
.gs-card-school-link:hover {
  color: var(--gs-accent);
}
.gs-card-meta {
  margin: 0;
  font-size: 0.78rem;
  color: var(--text-tertiary, #999);
}

/* ---- Article page ---- */
.page-gs-article .container {
  max-width: 820px;
}

/* ---- Index (list) page ----
   Index 列表頁需要 4-5 張卡並排才像 YouTube style，
   16:9 hero 圖在 280-320px 卡寬下表現最佳。
   在 1920px 寬幕 + 240px sidebar 下，1500px 容器可塞 5 張卡。*/
.page-gs-index .container {
  max-width: 1500px;
}
.page-gs-index .gs-grid {
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}

.gs-breadcrumb {
  padding: 16px 0 0;
  font-size: 0.85rem;
  color: var(--text-secondary, #666);
}
.gs-breadcrumb a {
  color: var(--text-secondary, #666);
  text-decoration: none;
}
.gs-breadcrumb a:hover {
  color: var(--gs-accent);
}
.gs-breadcrumb .sep {
  margin: 0 8px;
  color: var(--text-tertiary, #999);
}

.gs-article {
  background: var(--card-bg, #fff);
  border-radius: 12px;
  padding: 28px 32px;
  margin: 16px 0 24px;
  box-shadow: var(--card-shadow, 0 1px 3px rgba(0, 0, 0, 0.08));
}

.gs-article-head {
  margin-bottom: 18px;
}
.gs-article-meta-top {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: 12px;
}
.gs-tier-pill {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  color: #fff;
}
.gs-tier-pill.tier-kg        { background: #ff6b1a; }
.gs-tier-pill.tier-primary   { background: #4caf50; }
.gs-tier-pill.tier-secondary { background: #2196f3; }

.gs-publish {
  font-size: 0.85rem;
  color: var(--text-secondary, #666);
}

.gs-article-title {
  font-size: 1.85rem;
  line-height: 1.3;
  font-weight: 700;
  margin: 0 0 12px;
  color: var(--text-primary, #222);
}
.gs-article-school {
  margin: 0;
  font-size: 0.95rem;
  color: var(--text-secondary, #666);
}
.gs-article-school a {
  color: var(--text-secondary, #666);
  text-decoration: none;
  font-weight: 500;
}
.gs-article-school a:hover {
  color: var(--gs-accent);
}

.gs-attribution {
  display: block;
  margin: 18px 0 20px;
  padding: 14px 18px;
  background: var(--gs-accent-soft);
  border: 2px dashed var(--gs-border);
  border-radius: 8px;
  font-size: 0.88rem;
  line-height: 1.55;
  color: var(--text-primary, #222);
}
.gs-attribution strong {
  display: block;
  color: var(--gs-accent);
  font-size: 0.95rem;
  margin-bottom: 4px;
}
.gs-attribution-disclaimer {
  display: block;
  color: var(--text-secondary, #555);
}

.gs-hero {
  margin: 0 0 24px;
  border-radius: 8px;
  overflow: hidden;
  background: var(--surface-2, #eaeaea);
}
.gs-hero img {
  width: 100%;
  height: auto;
  display: block;
}

.gs-body {
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--text-primary, #222);
}
.gs-body p {
  margin: 0 0 18px;
}

.gs-gallery {
  margin: 32px 0 0;
  padding-top: 24px;
  border-top: 1px solid var(--border, #eee);
}
.gs-gallery-title {
  font-size: 1.1rem;
  margin: 0 0 16px;
  font-weight: 600;
  color: var(--text-primary, #222);
}
.gs-gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 12px;
}
.gs-gallery-item {
  margin: 0;
  background: var(--card-bg, #fff);
  border-radius: 6px;
  overflow: hidden;
}
.gs-gallery-item img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.2s ease;
}
.gs-gallery-item a:hover img {
  transform: scale(1.04);
}
.gs-gallery-item figcaption {
  font-size: 0.78rem;
  color: var(--text-secondary, #666);
  padding: 6px 10px;
  line-height: 1.4;
}

.gs-article-foot {
  margin-top: 32px;
  padding-top: 20px;
  border-top: 1px solid var(--border, #eee);
  font-size: 0.9rem;
}
.gs-article-foot p {
  margin: 0 0 8px;
  color: var(--text-secondary, #666);
}
.gs-original a {
  display: inline-block;
  padding: 10px 18px;
  background: var(--gs-accent);
  color: #fff;
  text-decoration: none;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.92rem;
  transition: background 0.15s ease;
}
.gs-original a:hover {
  background: #e85a0a;
  color: #fff;
}
.gs-back {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}
.gs-back a {
  color: var(--text-secondary, #666);
  text-decoration: none;
}
.gs-back a:hover {
  color: var(--gs-accent);
}
.gs-back-sep {
  color: var(--text-tertiary, #999);
}

.gs-related {
  margin: 0 0 40px;
  padding: 20px 24px;
  background: var(--card-bg, #fff);
  border-radius: 12px;
  box-shadow: var(--card-shadow, 0 1px 3px rgba(0, 0, 0, 0.08));
}
.gs-related-title {
  font-size: 1.1rem;
  margin: 0 0 12px;
  font-weight: 600;
}
.gs-related-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.gs-related-list li {
  border-bottom: 1px solid var(--border, #eee);
}
.gs-related-list li:last-child {
  border-bottom: none;
}
.gs-related-list a {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 10px 0;
  text-decoration: none;
  color: var(--text-primary, #222);
}
.gs-related-list a:hover .gs-related-title-text {
  color: var(--gs-accent);
}
.gs-related-title-text {
  flex: 1;
  font-weight: 500;
  font-size: 0.95rem;
}
.gs-related-ym {
  flex-shrink: 0;
  font-size: 0.8rem;
  color: var(--text-tertiary, #999);
}

/* Responsive */
@media (max-width: 640px) {
  .gs-article {
    padding: 18px 16px;
  }
  .gs-article-title {
    font-size: 1.4rem;
  }
  .gs-grid {
    grid-template-columns: 1fr;
  }
  .gs-gallery-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ===========================================================================
   School page �� embedded Goodschool section
   =========================================================================== */
.watch__section--gs {
  position: relative;
  background: linear-gradient(135deg, var(--gs-accent-soft), rgba(255, 255, 255, 0.65));
  border: 1px solid rgba(255, 107, 26, 0.25);
  border-left: 5px solid var(--gs-accent);
  border-radius: 12px;
  padding: 18px 20px;
  box-shadow: 0 4px 16px rgba(255, 107, 26, 0.10);
}
.watch__section--gs h3 {
  display: flex;
  align-items: center;
  gap: 8px;
}
.gs-articles-list {
  list-style: none;
  padding: 0;
  margin: 12px 0 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}
.gs-articles-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 10px;
  background: var(--card-bg, #fff);
  border: 1px solid rgba(255, 107, 26, 0.14);
  border-radius: 8px;
  text-decoration: none;
  color: var(--text-primary, #222);
  transition: box-shadow 0.15s ease, transform 0.15s ease, border-color 0.15s ease;
}
.gs-articles-item:hover {
  background: rgba(255, 107, 26, 0.12);
  border-color: var(--gs-accent);
  box-shadow: 0 3px 10px rgba(255, 107, 26, 0.16);
  transform: translateY(-1px);
}
.gs-articles-thumb {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  border-radius: 6px;
  overflow: hidden;
  background: #f1f5f9;
}
.gs-articles-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.gs-articles-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
  min-width: 0;
}
.gs-articles-title {
  font-size: 0.9rem;
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}
.gs-articles-ym {
  font-size: 0.78rem;
  color: var(--text-tertiary, #999);
}

@media (max-width: 640px) {
  .gs-articles-list {
    grid-template-columns: 1fr;
  }
}