/* PAGE HEADER */
.page-header-grid {
  position: absolute; inset: 0;
  background-image: linear-gradient(rgba(0,229,255,0.03) 1px, transparent 1px), linear-gradient(90deg, rgba(0,229,255,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 100% 100% at 0% 50%, black 30%, transparent 100%);
}
.page-tag { color: var(--accent); }
.page-tag::before { background: var(--accent); }

/* FILTER */
.filter-btn:hover, .filter-btn.active { border-color: var(--accent); color: var(--accent); background: rgba(0,229,255,0.05); }

/* SLIDES GRID */
.slides-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

.slide-card {
  background: var(--bg3); border: 1px solid var(--border);
  overflow: hidden; transition: all 0.3s; display: flex; flex-direction: column;
}
.slide-card:hover {
  border-color: rgba(0,229,255,0.35); transform: translateY(-4px);
  box-shadow: 0 20px 40px rgba(0,0,0,0.4), 0 0 0 1px rgba(0,229,255,0.08);
}

.slide-thumb {
  width: 100%; aspect-ratio: 16/9; background: var(--bg);
  position: relative; overflow: hidden;
}
.slide-thumb iframe {
  width: 100%; height: 100%; border: none; pointer-events: none;
}
.slide-thumb-fallback {
  width: 100%; height: 100%; display: flex; align-items: center; justify-content: center;
}
.slide-thumb-inner {
  width: 80%; height: 78%; border: 1px solid var(--border);
  display: flex; flex-direction: column; padding: 0.9rem; gap: 0.45rem;
}
.slide-line { height: 6px; background: rgba(0,229,255,0.12); border-radius: 2px; }
.slide-line.short { width: 55%; }
.slide-line.accent { background: rgba(0,229,255,0.5); width: 40%; }
.slide-dots { display: flex; gap: 4px; margin-top: auto; }
.slide-dot { width: 6px; height: 6px; border-radius: 50%; background: rgba(255,255,255,0.1); }
.slide-dot.on { background: var(--accent); }

.slide-overlay {
  position: absolute; inset: 0; background: rgba(0,0,0,0.6);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 0.8rem; opacity: 0; transition: opacity 0.25s;
}
.slide-card:hover .slide-overlay { opacity: 1; }

.open-btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.65rem 1.4rem;
  background: var(--accent); color: #000;
  font-family: var(--mono); font-size: 0.75rem; font-weight: 700;
  letter-spacing: 0.08em; text-transform: uppercase;
  text-decoration: none; transition: background 0.2s;
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
}
.open-btn:hover { background: #fff; }

.download-btn {
  font-family: var(--mono); font-size: 0.7rem; color: rgba(255,255,255,0.6);
  text-decoration: none; letter-spacing: 0.06em;
  border-bottom: 1px solid rgba(255,255,255,0.2); padding-bottom: 2px; transition: color 0.2s;
}
.download-btn:hover { color: var(--accent); }

.slide-info { padding: 1.2rem; flex: 1; display: flex; flex-direction: column; }
.slide-meta { font-family: var(--mono); font-size: 0.67rem; color: var(--accent); letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 0.45rem; }
.slide-title { font-size: 1.05rem; font-weight: 700; margin-bottom: 0.4rem; }
.slide-desc { font-size: 0.85rem; color: var(--muted); line-height: 1.55; flex: 1; }
.slide-footer {
  display: flex; align-items: center; justify-content: space-between;
  margin-top: 1rem; padding-top: 0.8rem; border-top: 1px solid var(--border);
}
.slide-date { font-family: var(--mono); font-size: 0.68rem; color: var(--muted); }
.slide-badge {
  font-family: var(--mono); font-size: 0.65rem; padding: 0.2rem 0.6rem;
  border: 1px solid; letter-spacing: 0.08em; text-transform: uppercase;
}
.badge-pdf { border-color: rgba(255,100,100,0.4); color: rgba(255,100,100,0.8); }
.badge-slides { border-color: rgba(0,229,255,0.4); color: rgba(0,229,255,0.8); }
.badge-pptx { border-color: rgba(255,160,50,0.4); color: rgba(255,160,50,0.8); }

@keyframes fadeUp { from { opacity:0; transform:translateY(20px); } to { opacity:1; transform:translateY(0); } }

/* RESPONSIVE */
@media (max-width: 768px) {
  .slides-grid { grid-template-columns: 1fr; }
  .slide-card:hover { transform: none; }
}

@media (max-width: 480px) {
  .slide-footer { flex-direction: column; align-items: flex-start; gap: 0.5rem; }
}