/* ---------- Design tokens (validated default palette) ---------- */
:root {
  --surface-1:      #fcfcfb;
  --page-plane:      #f9f9f7;
  --text-primary:   #0b0b0b;
  --text-secondary: #52514e;
  --text-muted:     #898781;
  --gridline:       #e1e0d9;
  --baseline:       #c3c2b7;
  --border:         rgba(11,11,11,0.10);

  --series-blue:    #2a78d6;
  --series-red:     #e34948;
  --good:           #0ca30c;

  /* sequential blue ramp (100 -> 700) */
  --seq-100:#cde2fb; --seq-150:#b7d3f6; --seq-200:#9ec5f4; --seq-250:#86b6ef;
  --seq-300:#6da7ec; --seq-350:#5598e7; --seq-400:#3987e5; --seq-450:#2a78d6;
  --seq-500:#256abf; --seq-550:#1c5cab; --seq-600:#184f95; --seq-650:#104281; --seq-700:#0d366b;

  --radius: 10px;
  --shadow: 0 1px 2px rgba(11,11,11,0.06), 0 8px 24px rgba(11,11,11,0.08);
}

:root[data-theme="dark"], :root:not([data-theme="light"]):not([data-theme="dark"]) {
  /* default follows system; dark values applied via media query below */
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --surface-1:      #1a1a19;
    --page-plane:      #0d0d0d;
    --text-primary:   #ffffff;
    --text-secondary: #c3c2b7;
    --text-muted:     #898781;
    --gridline:       #2c2c2a;
    --baseline:       #383835;
    --border:         rgba(255,255,255,0.10);

    --series-blue:    #3987e5;
    --series-red:     #e66767;
    --good:           #0ca30c;

    --seq-100:#0d366b; --seq-150:#104281; --seq-200:#184f95; --seq-250:#1c5cab;
    --seq-300:#256abf; --seq-350:#2a78d6; --seq-400:#3987e5; --seq-450:#5598e7;
    --seq-500:#6da7ec; --seq-550:#86b6ef; --seq-600:#9ec5f4; --seq-650:#b7d3f6; --seq-700:#cde2fb;
  }
}

:root[data-theme="dark"] {
  --surface-1:      #1a1a19;
  --page-plane:      #0d0d0d;
  --text-primary:   #ffffff;
  --text-secondary: #c3c2b7;
  --text-muted:     #898781;
  --gridline:       #2c2c2a;
  --baseline:       #383835;
  --border:         rgba(255,255,255,0.10);
  --series-blue:    #3987e5;
  --series-red:     #e66767;
  --seq-100:#0d366b; --seq-150:#104281; --seq-200:#184f95; --seq-250:#1c5cab;
  --seq-300:#256abf; --seq-350:#2a78d6; --seq-400:#3987e5; --seq-450:#5598e7;
  --seq-500:#6da7ec; --seq-550:#86b6ef; --seq-600:#9ec5f4; --seq-650:#b7d3f6; --seq-700:#cde2fb;
}

/* ---------- Base ---------- */
* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0;
  background: var(--page-plane);
  color: var(--text-primary);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3 { font-weight: 700; letter-spacing: -0.01em; }
a { color: var(--series-blue); }

/* ---------- Header ---------- */
.topbar {
  background: var(--surface-1);
  border-bottom: 1px solid var(--border);
  padding: 20px max(16px, calc((100% - 1200px)/2));
}
.topbar-inner { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; max-width: 1200px; margin: 0 auto; }
.brand { display: flex; gap: 14px; align-items: center; }
.brand-mark { font-size: 2.2rem; line-height: 1; }
.brand-text h1 { margin: 0; font-size: 1.5rem; }
.tagline { margin: 4px 0 0; color: var(--text-secondary); font-size: 0.92rem; max-width: 60ch; }

.theme-toggle {
  border: 1px solid var(--border); background: transparent; color: var(--text-primary);
  border-radius: 999px; width: 36px; height: 36px; cursor: pointer; flex: 0 0 auto;
  display: flex; align-items: center; justify-content: center; font-size: 0.95rem;
}
.theme-toggle .icon-moon { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: inline; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .icon-sun { display: none; }
  :root:not([data-theme="light"]) .theme-toggle .icon-moon { display: inline; }
}

.stat-hero {
  max-width: 1200px; margin: 16px auto 0; padding: 0 max(0px, calc((100% - 1200px)/2));
  display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 10px;
}
.stat-tile {
  background: var(--page-plane); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 10px 14px;
}
.stat-tile .stat-value { font-size: 1.5rem; font-weight: 700; font-variant-numeric: tabular-nums; }
.stat-tile .stat-label { font-size: 0.78rem; color: var(--text-secondary); margin-top: 2px; }

/* ---------- Century timeline ---------- */
.timeline-block { max-width: 1200px; margin: 18px auto 0; }
.timeline-caption { margin: 0 0 10px; color: var(--text-secondary); font-size: 0.85rem; }
.century-timeline { overflow-x: auto; padding-bottom: 4px; }
.tl-inner { display: flex; align-items: flex-end; gap: 3px; min-width: 860px; }
.tl-col { display: flex; flex-direction: column-reverse; gap: 1px; width: 9px; flex: 1 0 auto; cursor: pointer; border-radius: 2px; }
.tl-col:hover { outline: 1px solid var(--series-blue); outline-offset: 1px; }
.tl-brick { height: 3px; border-radius: 1px; }
.tl-axis { display: flex; gap: 3px; min-width: 860px; margin-top: 4px; }
.tl-tick { width: 9px; flex: 1 0 auto; font-size: 0.66rem; color: var(--text-muted); overflow: visible; white-space: nowrap; }

/* ---------- Tabs ---------- */
.tabs {
  display: flex; gap: 4px; max-width: 1200px; margin: 16px auto 0; padding: 0 16px;
  border-bottom: 1px solid var(--gridline);
}
.tab-btn {
  background: none; border: none; color: var(--text-secondary); font-size: 0.95rem; font-weight: 600;
  padding: 10px 16px; cursor: pointer; border-bottom: 2px solid transparent; margin-bottom: -1px;
}
.tab-btn.active { color: var(--text-primary); border-bottom-color: var(--series-blue); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

main { max-width: 1200px; margin: 0 auto; padding: 20px 16px 60px; }

/* ---------- Controls ---------- */
.controls { display: flex; flex-direction: column; gap: 10px; margin-bottom: 6px; }
.search-row { display: flex; gap: 10px; }
#searchInput {
  flex: 1; padding: 10px 14px; border-radius: var(--radius); border: 1px solid var(--border);
  background: var(--surface-1); color: var(--text-primary); font-size: 0.95rem;
}
.ghost-btn {
  border: 1px solid var(--border); background: var(--surface-1); color: var(--text-primary);
  border-radius: var(--radius); padding: 10px 14px; font-size: 0.88rem; cursor: pointer; white-space: nowrap;
}
.ghost-btn:hover { border-color: var(--series-blue); }

.filter-row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.filter-group { display: flex; gap: 6px; flex-wrap: wrap; }
.chip {
  border: 1px solid var(--border); background: var(--surface-1); color: var(--text-secondary);
  border-radius: 999px; padding: 6px 12px; font-size: 0.82rem; cursor: pointer;
}
.chip.active { background: var(--series-blue); border-color: var(--series-blue); color: #fff; }

#sortSelect {
  padding: 9px 12px; border-radius: var(--radius); border: 1px solid var(--border);
  background: var(--surface-1); color: var(--text-primary); font-size: 0.85rem;
}

.range-filter { display: flex; flex-direction: column; gap: 2px; min-width: 200px; flex: 1; }
.range-filter label { font-size: 0.75rem; color: var(--text-muted); }
.range-values { font-size: 0.8rem; color: var(--text-secondary); font-variant-numeric: tabular-nums; }
.range-filter input[type="range"] { width: 100%; margin: 0; accent-color: var(--series-blue); }

.active-chip-row { display: flex; gap: 6px; flex-wrap: wrap; }
.active-chip-row .chip.active { display: inline-flex; align-items: center; gap: 6px; }

.result-count { color: var(--text-muted); font-size: 0.82rem; margin: 14px 0 10px; }

/* ---------- Grid & cards ---------- */
.grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 12px;
}
.title-card {
  background: var(--surface-1); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 14px; cursor: pointer; display: flex; flex-direction: column; gap: 8px;
  transition: border-color 0.12s ease;
}
.title-card:hover { border-color: var(--series-blue); }
.card-top { display: flex; justify-content: space-between; gap: 8px; align-items: flex-start; }
.card-title { font-weight: 700; font-size: 0.98rem; line-height: 1.3; }
.card-meta { color: var(--text-muted); font-size: 0.78rem; }
.badge-row { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; }
.badge {
  display: inline-flex; align-items: center; gap: 4px; font-size: 0.78rem; font-weight: 600;
  padding: 3px 8px; border-radius: 999px; font-variant-numeric: tabular-nums;
}
.badge-your { background: color-mix(in srgb, var(--series-blue) 16%, transparent); color: var(--series-blue); }
.badge-imdb { background: var(--gridline); color: var(--text-secondary); }
.badge-delta-pos { background: color-mix(in srgb, var(--series-blue) 14%, transparent); color: var(--series-blue); }
.badge-delta-neg { background: color-mix(in srgb, var(--series-red) 14%, transparent); color: var(--series-red); }
.genre-tags { color: var(--text-muted); font-size: 0.76rem; }

.empty-state { text-align: center; color: var(--text-muted); padding: 60px 0; }

/* ---------- Insights ---------- */
.insights-intro { color: var(--text-secondary); font-size: 0.9rem; margin: 4px 0 16px; max-width: 70ch; }
.insight-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(360px, 1fr)); gap: 14px; }
.card-panel {
  background: var(--surface-1); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px 18px 18px;
}
.card-panel.wide { grid-column: 1 / -1; }
.card-panel h2 { margin: 0 0 4px; font-size: 1.05rem; }
.panel-sub { margin: 0 0 14px; color: var(--text-secondary); font-size: 0.82rem; max-width: 60ch; }

/* generic bar chart */
.bar-row { display: grid; grid-template-columns: 120px 1fr 44px; align-items: center; gap: 10px; padding: 5px 0; cursor: pointer; border-radius: 6px; }
.bar-row:hover { background: color-mix(in srgb, var(--series-blue) 8%, transparent); }
.bar-label { font-size: 0.82rem; color: var(--text-secondary); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.bar-track { position: relative; height: 10px; background: var(--gridline); border-radius: 4px; overflow: hidden; }
.bar-fill { position: absolute; left: 0; top: 0; bottom: 0; background: var(--series-blue); border-radius: 4px; }
.bar-fill.negative { background: var(--series-red); }
.bar-value { font-size: 0.78rem; color: var(--text-muted); font-variant-numeric: tabular-nums; white-space: nowrap; width: 44px; text-align: right; }

/* diverging delta chart */
.delta-row { display: grid; grid-template-columns: 1fr 90px 1fr; align-items: center; gap: 8px; padding: 6px 0; cursor: pointer; border-radius: 6px; }
.delta-row:hover { background: color-mix(in srgb, var(--series-blue) 8%, transparent); }
.delta-label { font-size: 0.82rem; text-align: right; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.delta-label.neg-side { text-align: left; color: var(--text-secondary); }
.delta-track { position: relative; height: 10px; background: var(--gridline); border-radius: 4px; }
.delta-track .mid { position: absolute; left: 50%; top: -3px; bottom: -3px; width: 1px; background: var(--baseline); }
.delta-fill { position: absolute; top: 0; bottom: 0; border-radius: 3px; }
.delta-fill.pos { background: var(--series-blue); left: 50%; }
.delta-fill.neg { background: var(--series-red); right: 50%; }
.delta-value { font-size: 0.76rem; color: var(--text-muted); text-align: center; font-variant-numeric: tabular-nums; }

.legend-row { display: flex; gap: 16px; font-size: 0.78rem; color: var(--text-secondary); margin-bottom: 10px; }
.legend-dot { display: inline-block; width: 9px; height: 9px; border-radius: 2px; margin-right: 5px; }

/* leaderboard (hidden gems) */
.leaderboard { display: flex; flex-direction: column; gap: 8px; }
.gem-row { display: flex; justify-content: space-between; align-items: center; gap: 10px; padding: 8px 10px; border: 1px solid var(--border); border-radius: 8px; cursor: pointer; }
.gem-row:hover { border-color: var(--series-blue); }
.gem-main { min-width: 0; }
.gem-title { font-weight: 600; font-size: 0.88rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.gem-meta { font-size: 0.76rem; color: var(--text-muted); }
.gem-badges { display: flex; gap: 6px; flex-shrink: 0; }

/* calendar heatmap */
.cal-wrap { overflow-x: auto; padding-bottom: 6px; }
.cal-grid { display: grid; grid-auto-flow: column; grid-template-rows: repeat(7, 12px); gap: 3px; }
.cal-cell { width: 12px; height: 12px; border-radius: 2px; background: var(--gridline); }
.cal-months { display: grid; grid-auto-flow: column; font-size: 0.68rem; color: var(--text-muted); margin-bottom: 4px; }

/* tooltip */
.viz-tooltip {
  position: fixed; pointer-events: none; background: var(--text-primary); color: var(--surface-1);
  font-size: 0.76rem; padding: 6px 9px; border-radius: 6px; z-index: 50; max-width: 220px;
  box-shadow: var(--shadow); transform: translate(-50%, -100%); margin-top: -8px; white-space: nowrap;
}

/* ---------- Modal ---------- */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.55); display: none; align-items: center; justify-content: center;
  padding: 20px; z-index: 100;
}
.modal-overlay:not([hidden]) { display: flex; }
.modal {
  background: var(--surface-1); border-radius: var(--radius); max-width: 520px; width: 100%;
  max-height: 85vh; overflow-y: auto; padding: 24px; position: relative; box-shadow: var(--shadow);
}
.modal-close {
  position: absolute; top: 14px; right: 14px; border: none; background: transparent; color: var(--text-muted);
  font-size: 1.1rem; cursor: pointer;
}
.modal h3 { margin: 0 0 4px; font-size: 1.25rem; }
.modal .modal-meta { color: var(--text-muted); font-size: 0.85rem; margin-bottom: 12px; }
.modal .badge-row { margin-bottom: 14px; }
.modal dl { display: grid; grid-template-columns: auto 1fr; gap: 6px 12px; font-size: 0.85rem; margin: 0 0 16px; }
.modal dt { color: var(--text-muted); }
.modal dd { margin: 0; }
.episodes-heading { margin: 0 0 8px; font-size: 0.85rem; color: var(--text-secondary); }
.episode-list { list-style: none; margin: 0 0 16px; padding: 0; display: flex; flex-direction: column; gap: 4px; max-height: 220px; overflow-y: auto; }
.episode-list li { display: flex; justify-content: space-between; align-items: center; gap: 10px; font-size: 0.82rem; padding: 4px 0; border-bottom: 1px solid var(--gridline); }
.episode-list li:last-child { border-bottom: none; }
.ep-title { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.modal .imdb-link {
  display: inline-block; padding: 8px 14px; border-radius: var(--radius); background: var(--series-blue);
  color: #fff; text-decoration: none; font-size: 0.85rem; font-weight: 600;
}

footer { text-align: center; color: var(--text-muted); font-size: 0.78rem; padding: 20px 0 40px; }

@media (max-width: 640px) {
  .stat-hero { grid-template-columns: repeat(2, 1fr); }
  .bar-row { grid-template-columns: 90px 1fr 44px; }
}