/* U-Driver Card System
   Expandable cards, grid layouts, overlay, detail content, section colors.
   All slides use flex column layout to fill 1920x1080 viewport. */

/* ---- Section Slide Layout (fills viewport) ---- */
.reveal .slides section:not(.closing-slide) {
  display: flex !important;
  flex-direction: column;
  justify-content: flex-start;
  align-items: stretch;
  height: 100% !important;
}

/* ---- Slide Header ---- */
.slide-header {
  text-align: left;
  flex-shrink: 0;
  margin-bottom: 1.5rem;
}
.slide-header h2 {
  font-size: 3em !important;
  font-weight: 800 !important;
  margin-bottom: 0.3rem !important;
  line-height: 1.15 !important;
}
.slide-subtitle {
  font-family: var(--ud-font-body);
  font-size: 1.3em;
  color: var(--ud-gray-600);
  font-weight: 400;
  margin-top: 0.3rem;
}

/* ---- Card Grid Layouts ---- */
.card-grid {
  display: grid;
  gap: 1.5rem;
  width: 100%;
  flex: 1;
  grid-auto-rows: 1fr;
}
.card-grid--3 { grid-template-columns: repeat(3, 1fr); }
.card-grid--2x2 { grid-template-columns: repeat(2, 1fr); }
.card-grid--5 { grid-template-columns: repeat(5, 1fr); }

/* ---- Section Accent Colors ---- */
[data-state="background"] .expandable-card { --card-accent: var(--ud-navy); }
[data-state="plans-2026"] .expandable-card { --card-accent: var(--ud-green); }
[data-state="future"] .expandable-card { --card-accent: var(--ud-blue); }
[data-state="challenges"] .expandable-card { --card-accent: #E74C3C; }
[data-state="summary-ask"] .expandable-card { --card-accent: var(--ud-teal); }

/* ---- Base Expandable Card ---- */
.expandable-card {
  --card-accent: var(--ud-navy);
  background: rgba(255,255,255,0.95);
  border: 1px solid rgba(23,27,55,0.06);
  border-left: 5px solid var(--card-accent);
  border-radius: 16px;
  padding: 2.5rem 1.5rem;
  cursor: pointer;
  transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(23,27,55,0.10), 0 1px 4px rgba(23,27,55,0.06);
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 260px;
}
.expandable-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 40px rgba(23,27,55,0.16), 0 2px 8px rgba(23,27,55,0.08);
  background: rgba(255,255,255,1);
}
.expandable-card.expanded:hover { transform: none; }

/* Gradient top accent line (::before) */
.expandable-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--card-accent), transparent);
  border-radius: 16px 16px 0 0;
  opacity: 0.6;
  transition: opacity 0.2s ease;
}
.expandable-card:hover::before { opacity: 1; }
.expandable-card.expanded::before { display: none; }

/* Expand hint arrow */
.expandable-card::after {
  content: '\2197';
  position: absolute;
  bottom: 0.8rem;
  right: 1rem;
  font-size: 1.2rem;
  color: var(--card-accent);
  opacity: 0.35;
  transition: opacity 0.2s ease;
}
.expandable-card:hover::after { opacity: 0.7; }
.expandable-card.expanded::after { display: none; }

/* ---- Dark Slide Cards ---- */
.dark-slide .expandable-card {
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.10);
  border-left-color: var(--card-accent);
  border-image: none;
  box-shadow: 0 4px 24px rgba(0,0,0,0.35), inset 0 1px 0 rgba(255,255,255,0.06);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}
.dark-slide .expandable-card:hover {
  box-shadow: 0 16px 48px rgba(0,0,0,0.45), inset 0 1px 0 rgba(255,255,255,0.1);
  background: rgba(255,255,255,0.13);
}
.dark-slide .expandable-card .card-metric { color: #fff; }
.dark-slide .expandable-card .card-title { color: var(--ud-gray-300); }
.dark-slide .expandable-card .card-icon { color: var(--card-accent); opacity: 0.9; }
.dark-slide .expandable-card::after { color: rgba(255,255,255,0.3); }
.dark-slide .expandable-card:hover::after { color: rgba(255,255,255,0.6); }

/* ---- Card Summary (collapsed state) ---- */
.card-summary {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 0.6rem;
}
.card-icon {
  width: 3.5rem;
  height: 3.5rem;
  margin-bottom: 0.8rem;
  color: var(--card-accent);
  flex-shrink: 0;
}
.card-icon svg { width: 100%; height: 100%; display: block; stroke-width: 2.2; }
.card-metric {
  font-family: var(--ud-font-heading);
  font-size: 2em;
  font-weight: 800;
  color: var(--card-accent);
  line-height: 1.15;
  font-variant-numeric: tabular-nums;
}
.card-title {
  font-family: var(--ud-font-body);
  font-size: 0.8em;
  color: var(--ud-gray-600);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-top: 0.3rem;
}

/* ---- Card Detail (hidden in grid, shown when expanded) ---- */
.card-detail { display: none; }
.expandable-card.expanded .card-detail { display: block; }

/* ---- Card Overlay ---- */
.card-overlay {
  position: fixed; inset: 0; z-index: 1000;
  display: flex; align-items: center; justify-content: center;
  background: rgba(23,27,55,0); pointer-events: none;
  transition: background 0.3s ease;
}
.card-overlay.active {
  pointer-events: all; background: rgba(23,27,55,0.5);
  backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px);
}

/* ---- Expanded Card (glassmorphism) ---- */
.expandable-card.expanded {
  width: 85vw; max-width: 1200px; max-height: 85vh;
  min-height: auto;
  overflow-y: auto;
  background: rgba(255,255,255,0.88);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-radius: 20px; padding: 2.5rem 3rem;
  box-shadow: 0 32px 80px rgba(23,27,55,0.2), 0 0 0 1px rgba(23,27,55,0.05);
  border-left-width: 6px; cursor: default;
}
.expandable-card.expanded .card-summary {
  flex-direction: row; justify-content: flex-start; align-items: center;
  text-align: left; gap: 1rem;
  margin-bottom: 1.5rem; padding-bottom: 1.2rem;
  border-bottom: 2px solid rgba(23,27,55,0.06);
}
.expandable-card.expanded .card-icon { width: 2.2rem; height: 2.2rem; margin-bottom: 0; }
.expandable-card.expanded .card-metric { font-size: 1.6em; }
.expandable-card.expanded .card-title { font-size: 0.85em; }

/* Dark expanded -- glassmorphism + data-theme since card moves to overlay (BUG-01) */
.expandable-card.expanded[data-theme="dark"] {
  background: rgba(23,27,55,0.88); color: var(--ud-gray-100);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
}
.expandable-card.expanded[data-theme="dark"] .card-summary {
  border-bottom-color: rgba(255,255,255,0.1);
}
.expandable-card.expanded[data-theme="dark"] .card-detail h3 { color: #fff; }
.expandable-card.expanded[data-theme="dark"] .card-detail p { color: var(--ud-gray-300); }
.expandable-card.expanded[data-theme="dark"] .card-detail p strong { color: #fff; }
.expandable-card.expanded[data-theme="dark"] .card-metric { color: #fff; }

/* ---- Card Detail Typography ---- */
.card-detail h3 {
  font-family: var(--ud-font-heading); font-size: 1.4em; font-weight: 700;
  color: var(--ud-navy); margin: 0 0 1rem 0; line-height: 1.3;
}
.dark-slide .card-detail h3 { color: #fff; }
.card-detail p {
  font-family: var(--ud-font-body); font-size: 0.9em; line-height: 1.65;
  color: var(--ud-gray-600); margin: 0 0 0.8rem 0;
}
.dark-slide .card-detail p { color: var(--ud-gray-300); }
.card-detail p strong { color: var(--ud-navy); font-weight: 700; }
.dark-slide .card-detail p strong { color: #fff; }

/* ---- Founders Grid ---- */
.founders-grid {
  display: grid; grid-template-columns: repeat(2,1fr); gap: 1.2rem;
  margin-top: 1rem;
}
.founder-card {
  background: var(--ud-off-white); border-radius: 12px; padding: 1.2rem;
  border-left: 3px solid var(--ud-navy);
}
.founder-card h4 {
  font-family: var(--ud-font-heading); font-size: 1.05em; font-weight: 700;
  color: var(--ud-navy); margin: 0 0 0.3rem 0;
}
.founder-card p { font-size: 0.85em; color: var(--ud-gray-600); margin: 0 0 0.3rem 0; }
.founder-bio { font-style: italic; color: var(--ud-gray-300) !important; }

/* ---- Partner Categories ---- */
.partner-categories { margin-top: 1rem; }
.partner-category { margin-bottom: 1.2rem; }
.partner-category h4 {
  font-family: var(--ud-font-heading); font-size: 0.9em; font-weight: 700;
  color: var(--ud-navy); margin: 0 0 0.6rem 0; text-transform: uppercase;
  letter-spacing: 0.05em;
}
.partner-tag {
  display: inline-block; background: var(--ud-navy); color: #fff;
  padding: 0.3rem 0.75rem; border-radius: 20px;
  font-family: var(--ud-font-body); font-size: 0.75em; font-weight: 500;
  margin: 0 0.4rem 0.4rem 0;
}

/* ---- Counter Items (detail) ---- */
.metrics-detail-grid {
  display: grid; grid-template-columns: repeat(4,1fr); gap: 1rem;
  margin-top: 1rem;
}
.counter-item {
  background: var(--ud-off-white); border-radius: 12px; padding: 1.2rem;
  text-align: center;
}
.counter-value {
  font-family: var(--ud-font-heading); font-size: 2em; font-weight: 800;
  color: var(--ud-navy); line-height: 1.2;
  font-variant-numeric: tabular-nums;
}
.counter-label {
  font-family: var(--ud-font-body); font-size: 0.8em; color: var(--ud-gray-600);
  margin-top: 0.3rem; font-weight: 500;
}

/* ---- Solutions List ---- */
.solutions-list {
  margin: 1rem 0; padding-left: 0; list-style: none; counter-reset: sol;
}
.solutions-list li {
  font-family: var(--ud-font-body); font-size: 0.88em; line-height: 1.6;
  color: var(--ud-gray-600); padding: 0.6rem 0 0.6rem 2.5rem;
  border-bottom: 1px solid var(--ud-gray-100); position: relative;
  counter-increment: sol;
}
.solutions-list li::before {
  content: counter(sol); position: absolute; left: 0; top: 0.55rem;
  width: 1.6rem; height: 1.6rem; border-radius: 50%;
  background: var(--card-accent); color: #fff;
  font-size: 0.75em; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
}

/* ---- Pilot Cards ---- */
.pilots-grid {
  display: grid; grid-template-columns: repeat(3,1fr); gap: 1rem;
  margin-top: 1rem;
}
.pilot-card {
  background: var(--ud-off-white); border-radius: 12px; padding: 1.5rem;
  border-top: 4px solid var(--card-accent);
}
.pilot-card h4 {
  font-family: var(--ud-font-heading); font-size: 1em; font-weight: 700;
  color: var(--ud-navy); margin: 0 0 0.5rem 0;
}
.pilot-card p { font-size: 0.82em; line-height: 1.55; margin: 0 0 0.5rem 0; }
.pilot-impact { color: var(--ud-green) !important; font-weight: 600; }
.pilot-impact strong { color: var(--ud-green) !important; }

/* ---- Fragment Visibility ---- */
.expandable-card.fragment {
  opacity: 0;
  transition: opacity 0.4s ease, transform 0.2s ease, box-shadow 0.2s ease;
}
.expandable-card.fragment.visible { opacity: 1; }

/* ---- Video Intro ---- */
.video-intro {
  position: absolute; inset: 0; display: flex;
  align-items: center; justify-content: center;
  z-index: 10; background: var(--ud-navy);
}
.video-intro video { max-width: 100%; max-height: 100%; }
.play-trigger {
  position: absolute; cursor: pointer;
  background: rgba(255,255,255,0.1); border: 2px solid rgba(255,255,255,0.3);
  border-radius: 50%; width: 80px; height: 80px;
  display: flex; align-items: center; justify-content: center;
  color: var(--ud-white); font-size: 2rem; transition: background 0.2s ease;
}
.play-trigger:hover { background: rgba(255,255,255,0.2); }

/* ---- Scrollbar for expanded cards ---- */
.expandable-card.expanded::-webkit-scrollbar { width: 6px; }
.expandable-card.expanded::-webkit-scrollbar-track { background: transparent; }
.expandable-card.expanded::-webkit-scrollbar-thumb {
  background: var(--ud-gray-300); border-radius: 3px;
}