/*
  Retention graph explainer (/tools/youtube-retention-graph).

  The tool keeps its own dark palette in every site theme: its script paints
  some colours directly (grid lines, badge text), so the panel has to stay
  dark for those to read. Everything is scoped under .rt-tool so it does not
  touch the site chrome around it.
*/
.rt-page { min-height: 100vh; display: flex; flex-direction: column; }
.rt-main { flex: 1; width: min(1100px, 100%); margin: 0 auto; padding: 48px 20px 72px; }

.rt-intro { max-width: 760px; margin: 0 0 24px; }
.rt-eyebrow { margin: 0 0 12px; color: var(--cw-muted); font-size: 13px; font-weight: 600; }
.rt-intro h1 { margin: 0 0 12px; color: var(--cw-text); font-size: clamp(28px, 4vw, 40px); line-height: 1.15; letter-spacing: -.02em; }
.rt-intro h1 span { color: #ff3b3b; }
.rt-intro .lede { margin: 0; color: var(--cw-muted); font-size: 16px; line-height: 1.6; }

.rt-tool {
  --bg: #0f1115;
  --panel: #171a21;
  --line: #2a2f3a;
  --text: #e8eaef;
  --muted: #9aa1ad;
  --accent: #ff3b3b;
  --curve: #4ea1ff;
  --ref: #5c6370;
  --good: #3ecf8e;
  --warn: #ffb547;
  --bad: #ff5d5d;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 20px;
}
.rt-tool *, .rt-tool *::before, .rt-tool *::after { box-sizing: border-box; }
.rt-tool h2 { font-size: 1.15rem; margin: 0 0 10px; color: var(--text); }
.rt-tool .grid { display: grid; grid-template-columns: 1fr 340px; gap: 20px; }
@media (max-width: 880px) { .rt-tool .grid { grid-template-columns: 1fr; } }
.rt-tool .card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px;
}
.rt-tool .chart-wrap { position: relative; }
.rt-tool svg#chart { width: 100%; height: auto; display: block; touch-action: none; user-select: none; }
.rt-tool .axis text { fill: var(--muted); font-size: 11px; }
.rt-tool .gridline { stroke: var(--line); stroke-width: 1; }
.rt-tool .zone-label { fill: var(--muted); font-size: 10px; letter-spacing: 0.06em; text-transform: uppercase; }
.rt-tool #handle { cursor: grab; outline: none; }
.rt-tool #handle:active { cursor: grabbing; }
.rt-tool #handle:focus-visible circle.ring { stroke: #fff; stroke-width: 2; }
.rt-tool .hint { color: var(--muted); font-size: 0.85rem; margin-top: 8px; }
.rt-tool .controls { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; align-items: center; }
.rt-tool .controls label { color: var(--muted); font-size: 0.85rem; }
.rt-tool select, .rt-tool button {
  background: #222733; color: var(--text); border: 1px solid var(--line);
  border-radius: 8px; padding: 6px 10px; font: inherit; font-size: 0.85rem; cursor: pointer;
}
.rt-tool button:hover, .rt-tool select:hover { border-color: #3d4452; }
.rt-tool .stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-bottom: 16px; }
.rt-tool .stat { background: #1e222b; border-radius: 8px; padding: 10px; }
.rt-tool .stat .k { color: var(--muted); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.05em; }
.rt-tool .stat .v { font-size: 1.25rem; font-weight: 650; font-variant-numeric: tabular-nums; }
.rt-tool .badge {
  display: inline-block; font-size: 0.72rem; font-weight: 650; text-transform: uppercase;
  letter-spacing: 0.05em; padding: 3px 8px; border-radius: 999px; margin-bottom: 8px;
}
.rt-tool #diagTitle { font-size: 1.2rem; margin: 0 0 6px; }
.rt-tool #diagBody p { margin: 0 0 10px; color: #cfd3da; }
.rt-tool #diagBody ul { margin: 0; padding-left: 18px; color: #cfd3da; }
.rt-tool #diagBody li { margin-bottom: 4px; }
.rt-tool .section { margin-top: 28px; }
.rt-tool .shapes { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 14px; }
.rt-tool .shape svg { width: 100%; height: 70px; display: block; margin-bottom: 8px; }
.rt-tool .shape h3 { margin: 0 0 4px; font-size: 0.98rem; color: var(--text); }
.rt-tool .shape p { margin: 0; color: var(--muted); font-size: 0.88rem; }
.rt-tool .basics { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; }
.rt-tool .basics p { margin: 0; color: var(--muted); font-size: 0.9rem; }
.rt-tool .basics strong { color: var(--text); }
.rt-tool .rt-note { color: var(--muted); font-size: 0.8rem; margin: 30px 0 0; }

.rt-cta { margin-top: 40px; padding: 28px; border: 1px solid var(--cw-border-soft); border-radius: 16px; }
.rt-cta h2 { margin: 0 0 10px; color: var(--cw-text); font-size: 22px; line-height: 1.3; }
.rt-cta p { margin: 0 0 18px; max-width: 680px; color: var(--cw-muted); font-size: 15px; line-height: 1.7; }
.rt-cta__actions { display: flex; flex-wrap: wrap; gap: 10px; }

@media (max-width: 600px) {
  /* Same phone header fit as the landing page (landing.css), so the nav
     stays inside the viewport. */
  .rt-page .marketing-nav { gap: 12px; }
  .rt-page .marketing-nav__actions .button--light { min-height: 36px; padding: 0 12px; white-space: nowrap; }
  .rt-main { padding: 32px 16px 56px; }
  .rt-tool { padding: 12px; border-radius: 12px; }
  .rt-tool .card { padding: 14px; }
  .rt-cta { padding: 20px; }
}
@media (max-width: 420px) {
  .rt-page .marketing-nav .status-badge { display: none; }
}