/* ==========================================================================
   第14回 次世代の臨床外科医のための特別セミナー フォトギャラリー
   学会向けフォーマルスタイル
   ========================================================================== */

:root {
  --color-bg:          #f6f5f1;
  --color-panel:       #ffffff;
  --color-text:        #2b2b2b;
  --color-muted:       #6b6b6b;
  --color-line:        #d8d4cc;
  --color-accent:      #1c3d5a;       /* 濃紺 */
  --color-accent-dark: #13293d;
  --color-accent-soft: #e8edf2;
  --color-download:    #1c3d5a;

  --font-sans: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic Medium", "Meiryo", system-ui, sans-serif;
  --font-mincho: "Hiragino Mincho ProN", "Yu Mincho", "YuMincho", serif;

  --radius: 2px;
  --shadow: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--color-accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- ヘッダー ---------- */
.site-header {
  background: #fff;
  border-bottom: 1px solid var(--color-line);
  padding: 40px 0 36px;
  text-align: center;
}
.site-header--compact {
  padding: 24px 0 20px;
  text-align: left;
}
.site-subtitle {
  margin: 0 0 8px;
  color: var(--color-muted);
  font-size: 14px;
  letter-spacing: .05em;
}
.site-title {
  margin: 0 0 20px;
  font-family: var(--font-mincho);
  font-size: 32px;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--color-accent-dark);
}
.site-meta {
  margin: 0;
  color: var(--color-muted);
  font-size: 14px;
  line-height: 1.9;
}
.site-meta-date {
  display: inline-block;
  margin-top: 6px;
  font-size: 13px;
}

/* ---------- パンくず／ページタイトル ---------- */
.breadcrumb {
  margin: 0 0 8px;
  font-size: 13px;
  color: var(--color-muted);
}
.breadcrumb-sep { margin: 0 6px; color: var(--color-line); }
.page-title {
  margin: 0;
  font-family: var(--font-mincho);
  font-size: 22px;
  font-weight: 600;
  color: var(--color-accent-dark);
  letter-spacing: .04em;
}

/* ---------- Day 見出し ---------- */
.day-section {
  margin: 48px 0;
}
.day-heading {
  margin: 0 0 24px;
  padding: 0 0 10px;
  border-bottom: 2px solid var(--color-accent);
  font-family: var(--font-mincho);
  font-size: 20px;
  font-weight: 600;
  color: var(--color-accent-dark);
  letter-spacing: .06em;
}

/* ---------- セッションカード（トップページ） ---------- */
.session-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}
.session-card {
  background: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: box-shadow .2s, transform .2s;
}
.session-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-1px);
}
.session-card-link {
  display: block;
  color: inherit;
  text-decoration: none;
}
.session-card-link:hover { text-decoration: none; }

.session-card-cover {
  aspect-ratio: 4 / 3;
  background: var(--color-accent-soft);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.session-card-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.session-card-placeholder {
  color: var(--color-muted);
  font-size: 13px;
}
.session-card-body { padding: 16px 18px 18px; }
.session-card-title {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-accent-dark);
  line-height: 1.5;
}
.session-card-subtitle {
  margin: 0 0 10px;
  font-size: 12px;
  color: var(--color-muted);
  line-height: 1.6;
}
.session-card-count {
  margin: 0;
  padding-top: 8px;
  border-top: 1px dotted var(--color-line);
  font-size: 12px;
  color: var(--color-muted);
  text-align: right;
}

/* ---------- 写真グリッド（セッションページ） ---------- */
.photo-count {
  margin: 24px 0 16px;
  font-size: 13px;
  color: var(--color-muted);
  padding: 10px 14px;
  background: var(--color-accent-soft);
  border-left: 3px solid var(--color-accent);
}
.photo-grid {
  list-style: none;
  margin: 0 0 40px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 12px;
}
.photo-item {
  background: var(--color-panel);
  border: 1px solid var(--color-line);
  overflow: hidden;
  position: relative;
}
.photo-link {
  display: block;
  position: relative;
  line-height: 0;
  cursor: pointer;
}
.photo-link img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform .25s ease, opacity .2s;
}
.photo-link:hover img { transform: scale(1.03); }

.photo-download-badge {
  position: absolute;
  top: 8px;
  right: 8px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 8px;
  background: rgba(28, 61, 90, 0.88);
  color: #fff;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .08em;
  border-radius: 2px;
  line-height: 1;
  opacity: 0;
  transform: translateY(-4px);
  transition: opacity .2s, transform .2s;
  pointer-events: none;
}
.photo-link:hover .photo-download-badge {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- セッション間ナビゲーション ---------- */
.session-nav {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 16px;
  padding: 28px 0 40px;
  border-top: 1px solid var(--color-line);
  margin-top: 40px;
}
.session-nav-link {
  display: flex;
  flex-direction: column;
  padding: 12px 16px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  color: var(--color-accent-dark);
  text-decoration: none;
  background: var(--color-panel);
  transition: background .15s, border-color .15s;
}
.session-nav-link:hover {
  background: var(--color-accent-soft);
  border-color: var(--color-accent);
  text-decoration: none;
}
.session-nav-prev { text-align: left; }
.session-nav-next { text-align: right; }
.session-nav-label {
  font-size: 11px;
  color: var(--color-muted);
  letter-spacing: .1em;
  margin-bottom: 2px;
}
.session-nav-title {
  font-size: 13px;
  font-weight: 500;
  line-height: 1.4;
}
.session-nav-home {
  padding: 10px 22px;
  background: var(--color-accent);
  color: #fff;
  font-size: 13px;
  text-decoration: none;
  border-radius: var(--radius);
  letter-spacing: .05em;
  white-space: nowrap;
}
.session-nav-home:hover {
  background: var(--color-accent-dark);
  text-decoration: none;
}
.session-nav-spacer { display: block; }

/* ---------- 注意書き・空状態 ---------- */
.notice {
  margin: 48px 0 40px;
  padding: 20px 24px;
  background: var(--color-panel);
  border-left: 3px solid var(--color-accent);
  border-radius: var(--radius);
}
.notice-heading {
  margin: 0 0 10px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent-dark);
  letter-spacing: .05em;
}
.notice-list {
  margin: 0;
  padding-left: 1.4em;
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.9;
}
.empty-notice {
  padding: 60px 20px;
  text-align: center;
  color: var(--color-muted);
  background: var(--color-panel);
  border: 1px dashed var(--color-line);
  margin: 32px 0;
}

/* ---------- フッター ---------- */
.site-footer {
  margin-top: 60px;
  padding: 24px 0;
  border-top: 1px solid var(--color-line);
  background: #fff;
  text-align: center;
  color: var(--color-muted);
  font-size: 12px;
  letter-spacing: .05em;
}

/* ---------- レスポンシブ ---------- */
@media (max-width: 640px) {
  .container { padding: 0 16px; }
  .site-title { font-size: 24px; }
  .page-title { font-size: 18px; }
  .site-header { padding: 28px 0 24px; }
  .photo-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
  }
  .session-list { grid-template-columns: 1fr; }
  .session-nav {
    grid-template-columns: 1fr;
    gap: 10px;
  }
  .session-nav-prev, .session-nav-next { text-align: center; }
  .session-nav-home { order: -1; }
}

/* ==========================================================================
   ライトボックス（GLightbox）対応
   ========================================================================== */

.photo-zoom-badge {
  position: absolute;
  top: 8px;
  right: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: rgba(28, 61, 90, 0.88);
  color: #fff;
  border-radius: 50%;
  line-height: 0;
  opacity: 0;
  transform: scale(.85);
  transition: opacity .2s, transform .2s;
  pointer-events: none;
}
.photo-link:hover .photo-zoom-badge {
  opacity: 1;
  transform: scale(1);
}

.gslide-desc .lightbox-download-btn {
  display: inline-block;
  padding: 10px 22px;
  margin: 8px 0;
  background: #ffffff;
  color: #1c3d5a !important;
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  border-radius: 3px;
  letter-spacing: .05em;
  transition: background .15s, transform .1s;
}
.gslide-desc .lightbox-download-btn:hover {
  background: #e8edf2;
  text-decoration: none;
  transform: translateY(-1px);
}
.gslide-desc .lightbox-download-btn:active {
  transform: translateY(0);
}

.gslide-description.description-bottom .gdesc-inner {
  text-align: center;
  padding: 14px 20px;
}
.gslide-title {
  color: #fff;
  font-size: 13px;
  opacity: .85;
}