/* === Reset & Base === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  color: #1a1a1a;
  line-height: 1.6;
  background: #fff;
  font-size: 16px;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* === Header === */
.page-header {
  text-align: center;
  padding: 3.5rem 1.5rem 2.5rem;
  border-bottom: 1px solid #eee;
}

.page-header h1 {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.page-header .title-accent {
  color: #a6192e;
}

.page-header .quote {
  margin-top: 1rem;
  color: #555;
  font-size: 1.1rem;
  line-height: 1.7;
}

.page-header .quote-translation {
  font-size: 0.95rem;
  color: #777;
}

.page-header .subtitle {
  margin-top: 1rem;
  color: #666;
  font-size: 1.15rem;
}

.page-header .page-note {
  margin-top: 0.6rem;
  color: #888;
  font-size: 0.9rem;
}

.page-header .guide-hover {
  color: #a6192e;
  font-weight: 600;
}

.page-header .guide-click {
  color: #a6192e;
  font-weight: 600;
}

.page-header .page-note-source {
  margin-top: 0.35rem;
}

/* === Section shared === */
.category-section, .highlights {
  padding: 3rem 0;
}

.category-section.alt {
  background: #f8f9fa;
}

.category-section h2, .highlights h2 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.section-intro {
  color: #555;
  font-size: 1rem;
  margin-bottom: 1.75rem;
  max-width: 780px;
}

/* === Navigation pills === */
.category-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #fff;
  border-bottom: 1px solid #eee;
  padding: 0.85rem 0;
}

.category-nav .container {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  overflow-x: auto;
}

.nav-pill {
  display: inline-block;
  padding: 0.5rem 1.2rem;
  border-radius: 20px;
  background: #e8f4fd;
  color: #1a6fa8;
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  white-space: nowrap;
  transition: background 0.15s;
}

.nav-pill:hover { background: #cce8f9; }

/* === Highlights === */
.highlights-grid {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.highlights-row {
  display: grid;
  gap: 1.25rem;
}

.highlights-row-2x4 { grid-template-columns: repeat(2, 1fr); }
.highlights-row-2x3 { grid-template-columns: repeat(2, 1fr); }
.highlights-row-2x2 { grid-template-columns: repeat(2, 1fr); }

.highlight-card {
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid #e0e0e0;
  background: #fff;
  position: relative;
}

.highlight-card video {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  background: #fff;
}

/* Aspect ratio for highlight cards */
.highlight-card.ar-2x4 { aspect-ratio: 1920 / 1044; }
.highlight-card.ar-2x3 { aspect-ratio: 1440 / 1044; }
.highlight-card.ar-2x2 { aspect-ratio: 960 / 1044; }

.highlight-card .highlight-label {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 0.6rem 0.85rem;
  background: linear-gradient(transparent, rgba(0,0,0,0.75));
  color: #fff;
  font-size: 0.9rem;
  font-weight: 500;
}

/* === Task list (collapsible) === */
.task-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.task-item {
  border: 1px solid #e5e5e5;
  border-radius: 8px;
  overflow: hidden;
  background: #fff;
}

.task-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.15rem;
  cursor: pointer;
  user-select: none;
  transition: background 0.1s;
}

.task-header:hover { background: #f9f9f9; }

.task-header .chevron {
  width: 20px;
  height: 20px;
  transition: transform 0.2s;
  flex-shrink: 0;
  color: #999;
}

.task-item.open .task-header .chevron {
  transform: rotate(90deg);
}

.task-header .task-name {
  font-weight: 600;
  font-size: 1.05rem;
  flex: 1;
}

.task-body {
  display: none;
  padding: 0 1.15rem 1.25rem;
}

.task-item.open .task-body {
  display: block;
}

.task-description {
  font-size: 0.95rem;
  color: #555;
  margin-bottom: 0.85rem;
}

.task-note {
  font-size: 0.9rem;
  color: #856404;
  background: #fff8e1;
  border-radius: 4px;
  padding: 0.6rem 0.85rem;
  margin-bottom: 0.85rem;
}

/* === Video grid (inside tasks) === */
.video-grid {
  display: grid;
  gap: 0.85rem;
}

/* Grid columns based on aspect ratio class */
.video-grid.grid-2x4 { grid-template-columns: 1fr; }
.video-grid.grid-2x3 { grid-template-columns: repeat(2, 1fr); }
.video-grid.grid-2x2 { grid-template-columns: repeat(3, 1fr); }

/* Camera control uses 2x2 aspect ratio but 2 columns per row */
.video-grid.camera-control-grid { grid-template-columns: repeat(2, 1fr); }

.video-cell {
  border-radius: 6px;
  overflow: hidden;
  background: #fff;
  border: 1px solid #e0e0e0;
  position: relative;
}

/* Aspect ratio containers */
.video-cell.ar-2x4 { aspect-ratio: 1920 / 1044; }
.video-cell.ar-2x3 { aspect-ratio: 1440 / 1044; }
.video-cell.ar-2x2 { aspect-ratio: 960 / 1044; }

.video-cell video {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  background: #fff;
}

/* === Footer === */
.page-footer {
  padding: 2rem 0;
  border-top: 1px solid #eee;
}

/* === Responsive === */
@media (max-width: 768px) {
  .highlights-row-2x4 { grid-template-columns: 1fr; }
  .highlights-row-2x3 { grid-template-columns: 1fr; }
  .highlights-row-2x2 { grid-template-columns: repeat(2, 1fr); }
  .video-grid.grid-2x3 { grid-template-columns: 1fr; }
  .video-grid.grid-2x2 { grid-template-columns: repeat(2, 1fr); }
  .page-header h1 { font-size: 1.5rem; }
}

@media (max-width: 480px) {
  .video-grid.grid-2x2 { grid-template-columns: 1fr; }
  .highlights-row-2x2 { grid-template-columns: 1fr; }
}