/* trends - dark observatory theme
   palette: validated 8-slot categorical (dark mode) - see README */

:root {
  color-scheme: dark;
  --page: #0d0d0d;
  --surface: #1a1a19;
  --ink: #ffffff;
  --ink-2: #c3c2b7;
  --muted: #898781;
  --grid: #2c2c2a;
  --baseline: #383835;
  --ring: rgba(255, 255, 255, 0.1);
  --s1: #3987e5;
  --s2: #008300;
  --s3: #d55181;
  --s4: #c98500;
  --s5: #199e70;
  --s6: #d95926;
  --s7: #9085e9;
  --s8: #e66767;
  --serif: "Fraunces", Georgia, serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
}

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

[hidden] { display: none !important; }

html { scroll-behavior: smooth; }

body {
  background: var(--page);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 15px;
  line-height: 1.6;
  overflow-x: hidden;
}

/* film grain */
.grain {
  position: fixed;
  inset: -50%;
  width: 200%;
  height: 200%;
  pointer-events: none;
  z-index: 40;
  opacity: 0.05;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  animation: grain 9s steps(10) infinite;
}
@keyframes grain {
  0%, 100% { transform: translate(0, 0); }
  20% { transform: translate(-3%, 2%); }
  40% { transform: translate(2%, -3%); }
  60% { transform: translate(-2%, -2%); }
  80% { transform: translate(3%, 3%); }
}

a { color: var(--s1); text-decoration: none; }
a:hover { text-decoration: underline; }
.mono { font-family: var(--mono); }

/* ---------- top bar (sticky, minimal) ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  border-bottom: 1px solid var(--grid);
  background: rgba(13, 13, 13, 0.72);
  backdrop-filter: saturate(140%) blur(14px);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
}
.topbar-inner {
  max-width: 1240px;
  margin: 0 auto;
  padding: 12px clamp(16px, 4vw, 32px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  text-decoration: none;
}
.brand:hover { text-decoration: none; }
.brand-mark {
  width: 26px;
  height: 26px;
  object-fit: contain;
  border-radius: 6px;
}
.brand-name {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -0.01em;
  color: var(--ink);
}

/* ---------- range filter (top-right) ---------- */
.range-bar {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
  justify-content: flex-end;
}
.range-btn {
  background: var(--surface);
  border: 1px solid var(--grid);
  color: var(--ink-2);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  padding: 5px 11px;
  border-radius: 4px;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  line-height: 1;
}
.range-btn:hover { border-color: rgba(255,255,255,0.35); color: var(--ink); }
.range-btn.active {
  background: var(--s1);
  border-color: var(--s1);
  color: #fff;
  font-weight: 600;
}
.range-btn--trending {
  background: rgba(57,135,229,0.12);
  border-color: var(--s1);
  color: var(--s1);
  font-weight: 600;
  margin-right: 6px;
}
.range-btn--trending:hover { background: rgba(57,135,229,0.22); color: var(--s1); }
.range-btn--trending.active { background: var(--s1); color: #fff; }

.card-trophy {
  display: inline-block;
  width: 36px;
  height: 36px;
  object-fit: contain;
  vertical-align: middle;
  margin-right: 8px;
  margin-top: -4px;
  border-radius: 6px;
}

/* ---------- loading / error ---------- */
.loading, .error {
  max-width: 1240px;
  margin: 60px auto;
  padding: 0 clamp(16px, 4vw, 32px);
  display: flex;
  align-items: center;
  gap: 14px;
  color: var(--muted);
}
.loading-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--s1);
  animation: pulse 1.1s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.9); opacity: 0.35; }
}
.error { color: var(--s8); }

/* ---------- chart grid ---------- */
.chart-grid {
  max-width: 1240px;
  margin: 0 auto;
  padding: clamp(20px, 3vw, 32px) clamp(16px, 4vw, 32px) 48px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(14px, 2vw, 22px);
}
.card.span2 { grid-column: span 2; }

.card {
  background: var(--surface);
  border: 1px solid var(--ring);
  border-radius: 14px;
  padding: 22px 22px 16px;
  min-width: 0;
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.25s ease, transform 0.25s ease, border-color 0.2s;
}
.card.in { opacity: 1; transform: translateY(0); }
.card:hover { border-color: rgba(255, 255, 255, 0.22); }

.card-head {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  margin-bottom: 14px;
}
.card-num {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 300;
  font-size: 30px;
  color: var(--muted);
  line-height: 1;
  padding-top: 2px;
  min-width: 44px;
}
.card-head h2 {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 21px;
  letter-spacing: -0.01em;
}
.story { display: none; }

.canvas-wrap { position: relative; height: 300px; width: 100%; }
.canvas-wrap.tall { height: 380px; }
.canvas-wrap canvas { max-width: 100%; }

/* real clickable repo links overlaid on the y-axis labels of bar charts */
.label-links { position: absolute; left: 0; top: 0; height: 100%; pointer-events: none; z-index: 2; }
.label-link {
  position: absolute;
  right: 8px;
  transform: translateY(-50%);
  pointer-events: auto;
  white-space: nowrap;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-2);
  text-decoration: none;
  cursor: pointer;
}
.label-link:hover { color: var(--ink); text-decoration: underline; }
.label-link:focus-visible { outline: 2px solid var(--s1); outline-offset: 2px; border-radius: 2px; }

/* ---------- footer ---------- */
.foot {
  border-top: 1px solid var(--grid);
  max-width: 1240px;
  margin: 30px auto 0;
  padding: 26px clamp(16px, 4vw, 32px) 46px;
  color: var(--muted);
  font-size: 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

/* ---------- responsive ---------- */

/* tablets / iPad: two charts side by side, tighten the wide hero */
@media (max-width: 900px) {
  .canvas-wrap { height: 260px; }
  .canvas-wrap.tall { height: 320px; }
  .card { padding: 18px 18px 14px; }
  .card-head h2 { font-size: 19px; }
  .card-num { font-size: 26px; min-width: 38px; }
}

/* phones: exactly one chart per row, taller, filter scrolls in one line */
@media (max-width: 767px) {
  .chart-grid { grid-template-columns: minmax(0, 1fr); }
  .card.span2 { grid-column: span 1; }
  .canvas-wrap { height: 360px; }
  .canvas-wrap.tall { height: 380px; }

  .topbar-inner {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    padding: 10px 16px;
  }
  .brand { justify-content: flex-start; }
  .range-bar {
    justify-content: flex-start;
    flex-wrap: nowrap;
    min-width: 0;
    overflow-x: auto;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
    margin: 0 -16px;
    padding: 0 16px 2px;
  }
  .range-bar::-webkit-scrollbar { display: none; }
  .range-btn { flex: 0 0 auto; }
}

@media (prefers-reduced-motion: reduce) {
  .grain { animation: none; }
  .card { transition: none; opacity: 1; transform: none; }
}