/* ─────────────────────────────────────────
   VTC Class Usage Distribution — styles.css
   ───────────────────────────────────────── */

/* ── Design Tokens ── */
:root {
  --bg-base:        #0a0d14;
  --bg-card:        #111520;
  --bg-card-hover:  #161c2d;
  --bg-glass:       rgba(255,255,255,0.04);
  --border:         rgba(255,255,255,0.08);
  --border-focus:   rgba(100,160,255,0.5);

  --usa-primary:    #3b82f6;
  --usa-light:      #93c5fd;
  --usa-bg:         rgba(59,130,246,0.12);

  --mx-primary:     #22c55e;
  --mx-light:       #86efac;
  --mx-bg:          rgba(34,197,94,0.12);

  --accent:         #818cf8;
  --accent-light:   #c7d2fe;

  --text-primary:   #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted:     #475569;

  --vtcr:  #60a5fa;
  --vtcu:  #a78bfa;
  --gtc:   #f472b6;
  --p1:    #34d399;
  --p2:    #4ade80;

  --radius-sm:  6px;
  --radius:    12px;
  --radius-lg: 20px;

  --shadow-card: 0 4px 32px rgba(0,0,0,0.45);
  --shadow-glow-us: 0 0 24px rgba(59,130,246,0.2);
  --shadow-glow-mx: 0 0 24px rgba(34,197,94,0.2);

  --transition: 0.22s cubic-bezier(0.4,0,0.2,1);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-base); }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.25); }

/* ── HEADER ── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10,13,20,0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: 1440px;
  margin: 0 auto;
  padding: 14px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.header-brand { display: flex; align-items: center; gap: 14px; }

.brand-icon {
  width: 44px; height: 44px;
  background: linear-gradient(135deg, var(--usa-primary), var(--accent));
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 13px; letter-spacing: .5px;
  color: #fff;
  box-shadow: var(--shadow-glow-us);
}

.brand-text { display: flex; flex-direction: column; }
.brand-title { font-size: 16px; font-weight: 700; color: var(--text-primary); }
.brand-sub { font-size: 12px; color: var(--text-secondary); }

.header-badges { display: flex; gap: 10px; flex-wrap: wrap; }

.badge {
  padding: 5px 12px;
  border-radius: 99px;
  font-size: 12px;
  font-weight: 600;
  border: 1px solid transparent;
}
.badge-us { background: var(--usa-bg); color: var(--usa-light); border-color: rgba(59,130,246,0.3); }
.badge-mx { background: var(--mx-bg); color: var(--mx-light); border-color: rgba(34,197,94,0.3); }

/* ── MAIN ── */
.main-content {
  max-width: 1440px;
  margin: 0 auto;
  padding: 48px 32px 80px;
  display: flex;
  flex-direction: column;
  gap: 64px;
}

/* ── SECTIONS ── */
.section { }

.section-header { margin-bottom: 28px; }
.section-title {
  font-size: 26px;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.5px;
  margin-bottom: 6px;
}
.section-subtitle { font-size: 14px; color: var(--text-secondary); }

/* ── SUMMARY CARDS ── */
.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 24px;
}

.class-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background var(--transition);
  position: relative;
  overflow: hidden;
}

.class-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--card-accent-a, transparent) 0%, var(--card-accent-b, transparent) 100%);
  opacity: 0;
  transition: opacity var(--transition);
  pointer-events: none;
}

.class-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
  border-color: rgba(255,255,255,0.16);
  background: var(--bg-card-hover);
}
.class-card:hover::before { opacity: 1; }
.class-card.active { border-color: var(--accent); box-shadow: 0 0 0 2px rgba(129,140,248,0.3), var(--shadow-card); }

.class-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 20px;
}

.class-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 99px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .4px;
  text-transform: uppercase;
}

.class-11-badge { background: rgba(251,191,36,0.15); color: #fbbf24; border: 1px solid rgba(251,191,36,0.3); }
.class-16-badge { background: rgba(234,179,8,0.12); color: #ca8a04; border: 1px solid rgba(202,138,4,0.3); }
.class-17-badge { background: rgba(148,163,184,0.12); color: #94a3b8; border: 1px solid rgba(148,163,184,0.3); }

.class-card-cta {
  font-size: 11px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 4px;
  transition: color var(--transition);
}
.class-card:hover .class-card-cta { color: var(--accent-light); }

.class-name {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 2px;
  color: var(--text-primary);
}
.class-desc {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 22px;
}

.class-totals {
  display: flex;
  gap: 16px;
  margin-bottom: 22px;
}
.class-total-item { flex: 1; }
.class-total-label { font-size: 11px; text-transform: uppercase; letter-spacing: .5px; color: var(--text-muted); margin-bottom: 4px; }
.class-total-value { font-size: 22px; font-weight: 700; }
.class-total-value.usa { color: var(--usa-light); }
.class-total-value.mx { color: var(--mx-light); }

/* Split bar */
.split-bar-wrapper { margin-top: 4px; }
.split-bar-labels {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  margin-bottom: 6px;
}
.split-bar-labels span:first-child { color: var(--usa-light); font-weight: 600; }
.split-bar-labels span:last-child { color: var(--mx-light); font-weight: 600; }

.split-bar {
  height: 10px;
  border-radius: 99px;
  background: rgba(255,255,255,0.06);
  overflow: hidden;
  display: flex;
}

.split-bar-us {
  background: linear-gradient(90deg, var(--usa-primary), var(--usa-light));
  height: 100%;
  transition: width 0.6s cubic-bezier(0.4,0,0.2,1);
  border-radius: 99px 0 0 99px;
}
.split-bar-mx {
  background: linear-gradient(90deg, var(--mx-primary), var(--mx-light));
  height: 100%;
  transition: width 0.6s cubic-bezier(0.4,0,0.2,1);
  border-radius: 0 99px 99px 0;
}

.class-meta {
  display: flex;
  gap: 16px;
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
}
.class-meta-item { font-size: 12px; color: var(--text-muted); }
.class-meta-item strong { color: var(--text-secondary); }

/* donut mini chart */
.summary-donut {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 16px 0;
}
.summary-donut canvas { max-width: 160px; max-height: 160px; }

/* ── DETAIL SECTION ── */
.detail-header-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.btn-back {
  padding: 9px 20px;
  background: var(--bg-glass);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  font-family: 'Inter', sans-serif;
}
.btn-back:hover {
  background: rgba(255,255,255,0.08);
  color: var(--text-primary);
  border-color: rgba(255,255,255,0.2);
}

/* ── SEARCH ── */
.search-row {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.search-wrapper {
  position: relative;
  flex: 1;
  min-width: 260px;
  max-width: 480px;
}

.search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 15px;
  pointer-events: none;
}

#search-input {
  width: 100%;
  padding: 11px 40px 11px 40px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 14px;
  font-family: 'Inter', sans-serif;
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}
#search-input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(100,160,255,0.12);
}
#search-input::placeholder { color: var(--text-muted); }

.search-clear {
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 14px;
  padding: 4px 6px;
  transition: color var(--transition);
}
.search-clear:hover { color: var(--text-primary); }

.result-count {
  font-size: 13px;
  color: var(--text-muted);
  white-space: nowrap;
}

/* ── DETAIL LAYOUT ── */
.detail-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 1100px) {
  .detail-layout { grid-template-columns: 400px 1fr; }
}

/* ── CHART CARD ── */
.chart-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
}

.chart-card-header { margin-bottom: 16px; }
.chart-card-title { font-size: 15px; font-weight: 700; color: var(--text-primary); margin-bottom: 3px; }
.chart-card-sub { font-size: 12px; color: var(--text-muted); }

.chart-wrapper {
  flex: 1;
  position: relative;
  min-height: 380px;
}
.chart-wrapper canvas { width: 100% !important; }

/* ── TABLE CARD ── */
.table-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.table-scroll {
  overflow-x: auto;
  max-height: 600px;
  overflow-y: auto;
}

#detail-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  min-width: 720px;
}

#detail-table thead {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(22,28,45,0.95);
  backdrop-filter: blur(8px);
}

#detail-table th {
  padding: 12px 14px;
  text-align: left;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .5px;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
#detail-table td {
  padding: 10px 14px;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  vertical-align: middle;
}

#detail-table tbody tr { transition: background var(--transition); }
#detail-table tbody tr:hover { background: rgba(255,255,255,0.04); }

.num-col { text-align: right !important; font-variant-numeric: tabular-nums; }
.vtcr-col { color: var(--vtcr); }
.vtcu-col { color: var(--vtcu); }
.gtc-col  { color: var(--gtc); }
.p1-col   { color: var(--p1); }
.p2-col   { color: var(--p2); }
.usa-col  { color: var(--usa-light) !important; font-weight: 600; }
.mx-col   { color: var(--mx-light) !important; font-weight: 600; }

.part-num {
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 12px;
  color: var(--accent-light);
  font-weight: 600;
}

.pct-pill {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 99px;
  font-size: 11px;
  font-weight: 600;
}
.pct-pill-us { background: var(--usa-bg); color: var(--usa-light); }
.pct-pill-mx { background: var(--mx-bg); color: var(--mx-light); }
.pct-pill-mx-high { background: rgba(34,197,94,0.25); color: #4ade80; }

.zero-row td { opacity: 0.4; }

/* ── METHODOLOGY ── */
.methodology-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}

.method-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: transform var(--transition), box-shadow var(--transition);
}
.method-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}

.method-icon {
  font-size: 28px;
  margin-bottom: 12px;
  display: block;
}
.method-card h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.method-card p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.7;
}
.method-card strong { color: var(--text-primary); }
.method-card em { color: var(--accent-light); font-style: normal; }

/* ── FOOTER ── */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 24px 32px;
  text-align: center;
  font-size: 12px;
  color: var(--text-muted);
}

/* ── RESPONSIVE ── */
@media (max-width: 768px) {
  .header-inner { padding: 12px 16px; }
  .main-content { padding: 32px 16px 60px; }
  .summary-grid { grid-template-columns: 1fr; }
  .detail-layout { grid-template-columns: 1fr; }
  .search-wrapper { max-width: 100%; }
  .header-badges { display: none; }
}

/* ── ANIMATION ── */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

.class-card { animation: fadeInUp 0.4s both; }
.class-card:nth-child(1) { animation-delay: 0.05s; }
.class-card:nth-child(2) { animation-delay: 0.12s; }
.class-card:nth-child(3) { animation-delay: 0.19s; }

.method-card { animation: fadeInUp 0.4s both; }

/* Shimmer highlight for high-mx parts */
@keyframes shimmer {
  0% { background-position: -200% center; }
  100% { background-position: 200% center; }
}