:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --surface2: #232736;
  --border: #2d3148;
  --text: #e4e6f0;
  --text-dim: #8b8fa3;
  --accent: #3b82f6;
  --accent-glow: rgba(59, 130, 246, 0.15);
  --oval: #ef4444;
  --sports: #22c55e;
  --formula: #a855f7;
  --dirt-oval: #f59e0b;
  --dirt-road: #ec4899;
  --unranked: #6b7280;
  --current-week: rgba(59, 130, 246, 0.12);
  --current-week-border: #3b82f6;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
}

.sticky-top {
  position: sticky;
  top: 0;
  z-index: 100;
}

.header {
  background: linear-gradient(160deg, #1e2235 0%, #0f1117 60%);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 4px 24px rgba(0,0,0,0.4);
}

.header-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem 2rem 1.5rem;
  position: relative;
}

.kofi-img-btn {
  position: absolute;
  top: 1.25rem;
  right: 2rem;
  line-height: 0;
}

.kofi-btn {
  position: absolute;
  top: 1.25rem;
  right: 2rem;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text-dim);
  text-decoration: none;
  padding: 0.3rem 0.65rem;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 500;
  transition: color 0.15s, border-color 0.15s;
  white-space: nowrap;
}

.kofi-btn:hover { color: var(--text); border-color: #3d4260; }

.kofi-btn svg { flex-shrink: 0; color: #ff5e5b; }

.header h1 {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 0.3rem;
  line-height: 1.1;
}

.header h1 span { color: var(--accent); }

.header .season-label {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.2rem;
  letter-spacing: -0.01em;
}

.header .subtitle {
  color: var(--text-dim);
  font-size: 0.875rem;
}

.filters {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
  flex-wrap: wrap;
  align-items: center;
}

.filter-group {
  display: flex;
  gap: 0.25rem;
}

.filter-label {
  font-size: 0.75rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-right: 0.25rem;
  align-self: center;
}

.filter-btn {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text-dim);
  padding: 0.35rem 0.75rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.8rem;
  transition: all 0.15s;
  font-family: inherit;
}

.filter-btn:hover {
  background: var(--border);
  color: var(--text);
}

.filter-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.filter-btn.cat-oval.active { background: var(--oval); border-color: var(--oval); }
.filter-btn.cat-sports.active { background: var(--sports); border-color: var(--sports); color: #000; }
.filter-btn.cat-formula.active { background: var(--formula); border-color: var(--formula); }
.filter-btn.cat-dirt-oval.active { background: var(--dirt-oval); border-color: var(--dirt-oval); color: #000; }
.filter-btn.cat-dirt-road.active { background: var(--dirt-road); border-color: var(--dirt-road); }
.filter-btn.cat-unranked.active { background: var(--unranked); border-color: var(--unranked); }

.search-box {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.35rem 0.75rem;
  border-radius: 6px;
  font-size: 0.8rem;
  font-family: inherit;
  width: 220px;
  outline: none;
  transition: border-color 0.15s;
}

.search-box:focus { border-color: var(--accent); }

.search-box::placeholder { color: var(--text-dim); }

.stats {
  margin-left: auto;
  font-size: 0.8rem;
  color: var(--text-dim);
  align-self: center;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 1.5rem 2rem;
}

.series-grid {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.series-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  transition: border-color 0.15s;
}

.series-card:hover { border-color: #3d4260; }

.series-header {
  padding: 0.75rem 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  user-select: none;
}

.series-header:hover { background: var(--surface2); }

.cat-badge {
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  white-space: nowrap;
  min-width: 70px;
  text-align: center;
}

.cat-badge.oval { background: rgba(239,68,68,0.15); color: var(--oval); }
.cat-badge.sports { background: rgba(34,197,94,0.15); color: var(--sports); }
.cat-badge.formula { background: rgba(168,85,247,0.15); color: var(--formula); }
.cat-badge.dirt-oval { background: rgba(245,158,11,0.15); color: var(--dirt-oval); }
.cat-badge.dirt-road { background: rgba(236,72,153,0.15); color: var(--dirt-road); }
.cat-badge.unranked { background: rgba(107,114,128,0.15); color: var(--unranked); }

.class-badge {
  font-size: 0.7rem;
  font-weight: 700;
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  background: var(--surface2);
  border: 1px solid var(--border);
}

.class-badge.R { color: #ef4444; }
.class-badge.D { color: #f59e0b; }
.class-badge.C { color: #eab308; }
.class-badge.B { color: #22c55e; }
.class-badge.A { color: #3b82f6; }

.series-title {
  font-weight: 600;
  font-size: 0.9rem;
  flex: 1;
}

.series-cars {
  font-size: 0.75rem;
  color: var(--text-dim);
  max-width: 300px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.series-freq {
  font-size: 0.7rem;
  color: var(--text-dim);
  white-space: nowrap;
}

.expand-icon {
  color: var(--text-dim);
  transition: transform 0.2s;
  font-size: 0.8rem;
}

.series-card.expanded .expand-icon { transform: rotate(180deg); }

.schedule-body {
  display: none;
  border-top: 1px solid var(--border);
}

.series-card.expanded .schedule-body { display: block; }

.week-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1px;
  background: var(--border);
}

.week-cell {
  background: var(--surface);
  padding: 0.6rem 0.8rem;
}

.week-cell.current {
  background: var(--current-week);
  border-left: 3px solid var(--current-week-border);
}

.week-num {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 0.15rem;
}

.week-cell.current .week-num {
  color: #60a5fa;
}

.week-track {
  font-size: 0.8rem;
  font-weight: 500;
}

.week-meta {
  font-size: 0.7rem;
  color: var(--text-dim);
  margin-top: 0.1rem;
}

.week-laps {
  display: inline-block;
  margin-top: 0.25rem;
  font-size: 0.67rem;
  color: var(--text-dim);
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.05rem 0.35rem;
  letter-spacing: 0.02em;
}

.no-results {
  text-align: center;
  padding: 3rem;
  color: var(--text-dim);
  font-size: 1rem;
}

/* Tab navigation */
.tab-nav {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.tab-nav-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  gap: 0;
}

.tab-btn {
  background: none;
  border: none;
  border-bottom: 3px solid transparent;
  color: var(--text-dim);
  padding: 0.75rem 1.25rem;
  cursor: pointer;
  font-size: 0.875rem;
  font-weight: 500;
  font-family: inherit;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: color 0.15s, border-color 0.15s;
}

.tab-btn:hover { color: var(--text); }

.tab-btn.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.tab-badge {
  background: var(--accent);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.1rem 0.4rem;
  border-radius: 10px;
  min-width: 18px;
  text-align: center;
  display: none;
}

.tab-badge:not(:empty) { display: inline-block; }

/* Week add button */
.week-cell { position: relative; }

.week-add-btn {
  position: absolute;
  bottom: 0.4rem;
  right: 0.4rem;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--surface2);
  color: var(--text-dim);
  font-size: 0.8rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
  font-family: inherit;
  line-height: 1;
  padding: 0;
}

.week-add-btn:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.week-add-btn.added {
  background: #16a34a;
  border-color: #16a34a;
  color: #fff;
}

/* My Schedule panel */
.my-schedule-empty {
  text-align: center;
  padding: 3rem;
  color: var(--text-dim);
}

.my-schedule-empty p { font-size: 1rem; margin-bottom: 0.5rem; }
.my-schedule-empty small { font-size: 0.8rem; }

.my-schedule-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}

.my-schedule-header .count-label {
  font-size: 0.875rem;
  color: var(--text-dim);
  flex: 1;
}

.export-group { display: flex; gap: 0.5rem; }

.export-btn {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.35rem 0.75rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.8rem;
  font-family: inherit;
  transition: all 0.15s;
}

.export-btn:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.my-week-group { margin-bottom: 1.5rem; }

.my-week-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--border);
}

.my-race-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.65rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.4rem;
  transition: border-color 0.15s;
}

.my-race-card:hover { border-color: #3d4260; }

.my-race-info { flex: 1; min-width: 0; }

.my-race-title {
  font-weight: 600;
  font-size: 0.875rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.my-race-meta { font-size: 0.75rem; color: var(--text-dim); margin-top: 0.15rem; }

.my-race-remove {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-dim);
  width: 26px;
  height: 26px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  flex-shrink: 0;
  transition: all 0.15s;
  font-family: inherit;
}

.my-race-remove:hover { background: #ef4444; border-color: #ef4444; color: #fff; }

/* This Week panel */
.week-view-header { display: flex; align-items: baseline; gap: 1rem; margin-bottom: 1.25rem; flex-wrap: wrap; }
.week-view-title { font-size: 1rem; font-weight: 700; color: var(--text); }
.week-view-count { font-size: 0.8rem; color: var(--text-dim); }

.tw-category-group { margin-bottom: 1.5rem; }
.tw-category-header { font-size: 0.7rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; padding: 0.25rem 0.6rem; border-radius: 4px; display: inline-block; margin-bottom: 0.6rem; }
.tw-category-header.oval { background: rgba(239,68,68,0.15); color: var(--oval); }
.tw-category-header.sports { background: rgba(34,197,94,0.15); color: var(--sports); }
.tw-category-header.formula { background: rgba(168,85,247,0.15); color: var(--formula); }
.tw-category-header.dirt-oval { background: rgba(245,158,11,0.15); color: var(--dirt-oval); }
.tw-category-header.dirt-road { background: rgba(236,72,153,0.15); color: var(--dirt-road); }
.tw-category-header.unranked { background: rgba(107,114,128,0.15); color: var(--unranked); }

.tw-card { background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 0.65rem 1rem; display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.4rem; position: relative; transition: border-color 0.15s; }
.tw-card:hover { border-color: #3d4260; }
.tw-card-info { flex: 1; min-width: 0; }
.tw-card-title { font-weight: 600; font-size: 0.875rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.tw-card-meta { font-size: 0.75rem; color: var(--text-dim); margin-top: 0.15rem; }

/* Favorite button in This Week cards */
.tw-fav-btn { background: none; border: none; color: var(--text-dim); font-size: 1rem; cursor: pointer; padding: 0.1rem 0.3rem; flex-shrink: 0; line-height: 1; transition: color 0.15s; font-family: inherit; }
.tw-fav-btn:hover, .tw-fav-btn.active { color: #f59e0b; }
.tw-favorites-header { background: rgba(245,158,11,0.15); color: #f59e0b; }
/* Make add button static inside tw-card so it sits inline next to the star */
.tw-card .week-add-btn { position: static; flex-shrink: 0; }

/* Share button */
.export-btn-copied { background: #16a34a !important; border-color: #16a34a !important; color: #fff !important; }

/* Toast notification */
.toast { position: fixed; bottom: 1.5rem; left: 50%; transform: translateX(-50%) translateY(6px); background: var(--surface2); border: 1px solid var(--border); color: var(--text); padding: 0.6rem 1.25rem; border-radius: 8px; font-size: 0.85rem; box-shadow: 0 4px 20px rgba(0,0,0,0.5); opacity: 0; pointer-events: none; transition: opacity 0.2s, transform 0.2s; z-index: 500; white-space: nowrap; }
.toast.toast-visible { opacity: 1; transform: translateX(-50%) translateY(0); }

@media (max-width: 768px) {
  .header-inner { padding: 1rem; }
  .header h1 { margin-top: 25px; font-size: 1.75rem; }
  .header .season-label { font-size: 1rem; }
  .kofi-img-btn { top: 0.75rem; right: 1rem; }
  .kofi-btn {
    position: static;
    display: inline-flex;
    margin-top: 0.5rem;
  }
  .container { padding: 1rem; }
  .tab-nav-inner { padding: 0 1rem; }
  .filters { gap: 0.4rem; }
  .filter-btn {
    padding: 0.25rem 0.5rem;
    font-size: 0.72rem;
    white-space: nowrap;
  }
  .filter-group { flex-wrap: wrap; }
  .series-cars, .series-freq { display: none; }
  .search-box { width: 100%; }
  .stats { display: none; }
  .week-grid { grid-template-columns: 1fr; }
}