/* ═══════════════════════════════════════════════════════════════════
   f1predict.css — F1Predict (debate world: ember, standing in for F1 red)
   Race control at night. A circuit traced once over the flow field,
   a pipeline that reads top to bottom like a telemetry stack, a timing
   tower of real probabilities, and the what-if lab on the bench.
   ═════════════════════════════════════════════════════════════════ */

.chapter-body > .body-text, .chapter-body > .body-quote { max-width: 66ch; }
.chapter-body .body-text em { font-family: var(--f-serif); font-style: italic; color: var(--accent); }

/* ── hero: the circuit draws itself once ──────────────────────────── */
.hero-circuit-svg {
  position: absolute; right: 4vw; top: 44%; z-index: -1; transform: translateY(-50%);
  width: min(46vw, 660px); height: auto; overflow: visible; pointer-events: none;

}
.hero-circuit-svg .track {
  fill: none; stroke: var(--accent); stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round;
  stroke-dasharray: 1; stroke-dashoffset: 1; opacity: 0.5;
  animation: f1-trace 3.6s var(--ease) 0.6s forwards;
}
.hero-circuit-svg .node { fill: var(--accent); opacity: 0; animation: f1-node 0.6s ease 3.4s forwards; }
@keyframes f1-trace { to { stroke-dashoffset: 0; } }
@keyframes f1-node { to { opacity: 0.85; } }
@media (max-width: 860px) { .hero-circuit-svg { right: -10vw; top: 30%; width: 78vw; opacity: 0.5; } }

/* the hero readout that carries its own tiny distribution */
.mc-line { display: flex; align-items: center; gap: 12px; }
#mcMini { flex: none; animation: mc-in 0.9s var(--ease) 1.2s both; }
@keyframes mc-in { from { opacity: 0; transform: translateY(4px); } }
.hstat-range .hstat-num { font-size: clamp(26px, 0.9rem + 1.8vw, 48px); }
@media (max-width: 420px) { #mcMini { width: 54px !important; height: auto !important; } .mc-line { gap: 8px; } }

/* ── chapter two: three layers ────────────────────────────────────── */
.layers .card { border-radius: 0; }
.policy-tag { align-self: flex-start; white-space: normal; line-height: 1.35; padding-block: 5px; }
.policy-card.highlight {
  border-color: color-mix(in srgb, var(--accent) 48%, var(--line));
  background: radial-gradient(90% 70% at 100% 0%, color-mix(in srgb, var(--accent) 12%, transparent), transparent 70%), var(--bg-raise);
  box-shadow: 0 34px 90px -46px color-mix(in srgb, var(--accent) 70%, transparent);
}
.policy-card.highlight::after {
  content: 'F1Predict'; position: absolute; top: 18px; right: 18px;
  padding: 6px 10px; border-radius: var(--r-pill);
  font: 600 10.5px/1 var(--f-sans); font-stretch: var(--wd-label); letter-spacing: 0.005em; 
  color: var(--accent); border: 1px solid color-mix(in srgb, var(--accent) 42%, transparent);
}

/* the pipeline beside the tools that run it */
.pipe-grid {
  display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: clamp(32px, 4vw, 72px);
  align-items: start; margin-top: clamp(72px, 9vw, 128px);
}
.pipe-col { display: grid; gap: 22px; position: sticky; top: calc(var(--nav-h) + 32px); }
@media (max-height: 780px) { .pipe-col { position: static; } }
.pipe-diagram {
  position: relative; isolation: isolate;
  padding: clamp(44px, 4vw, 54px) clamp(18px, 2.4vw, 30px) clamp(22px, 2.6vw, 30px);
  border: 1px solid var(--line-2); border-radius: 0;
  background: radial-gradient(80% 60% at 0% 0%, color-mix(in srgb, var(--accent) 10%, transparent), transparent 70%), var(--bg-raise);
  box-shadow: var(--shadow);
}
.pipe-diagram::before {
  content: 'MODEL PIPELINE'; position: absolute; top: 20px; right: 22px;
  font: 500 11px/1 var(--f-mono); letter-spacing: 0.2em; color: var(--text-3);
}
.pipe-list { display: grid; gap: 14px; }
.pipe-row {
  position: relative; display: grid; grid-template-columns: 48px minmax(0, 1fr); gap: 16px; align-items: start;
  transition: opacity 0.8s var(--ease), transform 0.9s var(--ease);
}
/* the line data travels down, node to node */
.pipe-row:not(:last-child)::after {
  content: ''; position: absolute; left: 23px; top: 48px; bottom: -14px; width: 2px;
  background: linear-gradient(color-mix(in srgb, var(--accent) 85%, transparent), color-mix(in srgb, var(--accent) 25%, transparent));

  transform-origin: top; transition: transform 0.7s var(--ease);
}
.pipe-row:nth-child(2) { transition-delay: 0.12s; } .pipe-row:nth-child(2)::after { transition-delay: 0.3s; }
.pipe-row:nth-child(3) { transition-delay: 0.24s; } .pipe-row:nth-child(3)::after { transition-delay: 0.42s; }
.pipe-row:nth-child(4) { transition-delay: 0.36s; } .pipe-row:nth-child(4)::after { transition-delay: 0.54s; }
.pipe-row:nth-child(5) { transition-delay: 0.48s; }
.pipe-row:nth-child(1)::after { transition-delay: 0.18s; }
.can-reveal .pipe-diagram:not(.is-in) .pipe-row { opacity: 0; transform: translateY(12px); }
.can-reveal .pipe-diagram:not(.is-in) .pipe-row::after { transform: scaleY(0); }
.pipe-step {
  position: relative; z-index: 1; width: 48px; height: 48px; display: grid; place-items: center; border-radius: 50%;
  font: 600 13px/1 var(--f-mono); color: var(--accent); background: var(--bg-raise);
  border: 1px solid color-mix(in srgb, var(--accent) 55%, transparent);

}
.pipe-out .pipe-step { color: var(--on-accent); background: var(--accent); }
.pipe-card {
  padding: 12px 16px 14px; border-radius: 0; border: 1px solid var(--line);
  background: color-mix(in srgb, var(--text) 2.5%, transparent); transition: border-color 0.4s var(--ease);
}
.pipe-row:hover .pipe-card { border-color: color-mix(in srgb, var(--accent) 40%, var(--line)); }
.pipe-name { font: 700 clamp(16px, 0.9rem + 0.4vw, 19px)/1.25 var(--f-disp); letter-spacing: -0.015em; color: var(--text); }
.pipe-sub { margin-top: 6px; font: 500 12.5px/1.5 var(--f-mono); color: var(--text-3); }
html[lang="zh-CN"] .pipe-name { letter-spacing: 0; }

.spec-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
@media (max-width: 560px) { .spec-2 { grid-template-columns: minmax(0, 1fr); } }
.tech-card { min-height: 230px; }
.tech-icon { width: 38px; height: 38px; display: grid; place-items: center; margin-bottom: 14px; border-radius: 0; color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, transparent); }
.tech-icon svg { width: 20px; height: 20px; }
@media (max-width: 1000px) { .pipe-grid { grid-template-columns: minmax(0, 1fr); } .pipe-col { position: static; } }

/* ── chapter three: the timing tower + the form arcs ──────────────── */
.podium-elo-grid { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: clamp(20px, 2.4vw, 32px); align-items: start; }
.viz { display: grid; gap: 14px; min-width: 0; }
.viz-label { font: 500 11.5px/1.3 var(--f-sans); font-stretch: var(--wd-label); letter-spacing: 0.005em;  color: var(--accent); }
html[lang="zh-CN"] .viz-label { letter-spacing: 0.04em; }
.prob-chart, .elo-box {
  padding: clamp(18px, 2.4vw, 30px); border: 1px solid var(--line-2); border-radius: 0;
  background: linear-gradient(180deg, color-mix(in srgb, var(--accent) 5%, transparent), transparent 40%), var(--bg-raise);
  box-shadow: var(--shadow);
}
.prob-legend { display: flex; justify-content: flex-end; gap: 8px; padding-bottom: 12px; margin-bottom: 6px; border-bottom: 1px solid var(--line); font: 500 11px/1 var(--f-sans); font-stretch: var(--wd-label); letter-spacing: 0.005em;  color: var(--text-3); }
.prob-legend span:first-child { color: var(--accent); }
.prob-row { display: grid; grid-template-columns: 8.2rem minmax(0, 1fr); align-items: center; gap: 16px; padding: 10px 0; }
.prob-row + .prob-row { border-top: 1px solid var(--line); }
.prob-name { display: flex; align-items: center; gap: 10px; font: 600 15px/1 var(--f-disp); letter-spacing: -0.01em; color: var(--text); }
.prob-dot { width: 4px; height: 18px; flex-shrink: 0; border-radius: 2px; }   /* the team stripe */
.prob-bar-wrap { height: 10px; border-radius: 0; background: color-mix(in srgb, var(--text) 6%, transparent); overflow: hidden; }
.prob-bar { height: 100%; border-radius: inherit; transform-origin: left; transform: scaleX(var(--w, 0)); transition: transform 1.1s var(--ease) calc(var(--i, 0) * 0.07s); }
.can-reveal .prob-chart:not(.is-in) .prob-bar { transform: scaleX(0); }
.prob-row.top3 .prob-bar { background: linear-gradient(90deg, color-mix(in srgb, var(--accent) 45%, transparent), var(--accent)); }
.prob-row:not(.top3) .prob-bar { background: linear-gradient(90deg, color-mix(in srgb, var(--text) 12%, transparent), color-mix(in srgb, var(--text) 32%, transparent)); }
.prob-stat { margin-top: 7px; font: 500 12.5px/1.2 var(--f-mono); color: var(--text-3); }
.prob-stat b { font-weight: 700; color: var(--text); }
.prob-row.top3 .prob-stat b { color: var(--accent); }
.elo-row { display: flex; align-items: center; gap: 16px; padding: 12px 0; }
.elo-row + .elo-row { border-top: 1px solid var(--line); }
.elo-name { width: 7.4rem; flex-shrink: 0; display: flex; align-items: center; gap: 10px; font: 600 15px/1 var(--f-disp); color: var(--text); }
.elo-spark {
  flex: 1; min-width: 0; height: 40px; overflow: visible;
  background: linear-gradient(transparent calc(50% - 0.5px), var(--line) calc(50% - 0.5px) calc(50% + 0.5px), transparent calc(50% + 0.5px));
}
.elo-spark polyline { fill: none; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.elo-note { margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--line); font: 500 12.5px/1.6 var(--f-mono); color: var(--text-3); }

.metric-4 { margin-top: clamp(56px, 7vw, 96px); }   /* four across comes from .readouts; phones take its 2 x 2 */
.metric-4 .ro-n { font-size: clamp(26px, 1rem + 1.6vw, 46px); white-space: normal; overflow-wrap: anywhere; }
.metric-4 .metric-cell:first-child .ro-n { color: var(--accent); }
.gh-cta {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 18px 32px;
  margin-top: clamp(40px, 5vw, 64px); padding: clamp(22px, 2.6vw, 32px);
  border: 1px solid var(--line-2); border-radius: 0;
  background: radial-gradient(80% 140% at 100% 50%, color-mix(in srgb, var(--accent) 10%, transparent), transparent 70%), var(--bg-raise);
}
.github-cta .gh-ico { width: 18px; height: 18px; }
.github-cta:hover .gh-ico { transform: none; }
.insights .card { border-radius: 0; }

/* ── the what-if lab ──────────────────────────────────────────────── */
.whatif { background: radial-gradient(55% 45% at 85% 20%, color-mix(in srgb, var(--accent) 8%, transparent), transparent 70%); }
.f1wi-shell .bench-bar { flex-wrap: wrap; gap: 12px 16px; padding-block: 8px; }
.f1wi-tabs { display: flex; flex-wrap: wrap; gap: 6px; margin-left: auto; }
.f1wi-tab {
  min-width: 54px; min-height: 44px; padding: 0 14px; border-radius: var(--r-pill); border: 1px solid var(--line-2);
  font: 600 12.5px/1 var(--f-mono); letter-spacing: 0.1em; color: var(--text-2);
  transition: color 0.3s, border-color 0.3s, background-color 0.3s, box-shadow 0.3s;
}
.f1wi-tab:hover { color: var(--text); border-color: var(--text-3); }
.f1wi-tab.active { color: var(--on-accent); background: var(--accent); border-color: var(--accent); }
.f1wi-controls { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-bottom: 1px solid var(--line); }
.sim-ctrl-grp { padding: clamp(16px, 2vw, 24px) clamp(18px, 2.4vw, 30px); }
.sim-ctrl-grp + .sim-ctrl-grp { border-left: 1px solid var(--line); }
.sim-ctrl-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; }
.sim-ctrl-label { font: 500 11.5px/1.3 var(--f-mono); letter-spacing: 0.14em; text-transform: uppercase; color: var(--text-2); }
html[lang="zh-CN"] .sim-ctrl-label { letter-spacing: 0.04em; }
.sim-ctrl-val { font: 700 20px/1 var(--f-disp); letter-spacing: -0.02em; color: var(--accent); font-variant-numeric: tabular-nums; }
.f1wi-shell .sim-slider { -webkit-appearance: none; appearance: none; display: block; width: 100%; height: 44px; margin-top: 4px; background: transparent; cursor: pointer; }
.f1wi-shell .sim-slider::-webkit-slider-runnable-track { height: 4px; border-radius: 0; background: linear-gradient(90deg, color-mix(in srgb, var(--accent) 70%, transparent), color-mix(in srgb, var(--accent) 16%, transparent)); }
.f1wi-shell .sim-slider::-moz-range-track { height: 4px; border-radius: 0; background: linear-gradient(90deg, color-mix(in srgb, var(--accent) 70%, transparent), color-mix(in srgb, var(--accent) 16%, transparent)); }
.f1wi-shell .sim-slider::-webkit-slider-thumb { -webkit-appearance: none; width: 20px; height: 20px; margin-top: -8px; border-radius: 50%; background: var(--accent); border: 3px solid var(--bg-raise); box-shadow: 0 0 0 1px var(--accent), 0 0 18px var(--accent); transition: transform 0.25s var(--ease); }
.f1wi-shell .sim-slider::-moz-range-thumb { width: 14px; height: 14px; border-radius: 50%; background: var(--accent); border: 3px solid var(--bg-raise); box-shadow: 0 0 0 1px var(--accent), 0 0 18px var(--accent); }
.f1wi-shell .sim-slider:active::-webkit-slider-thumb { transform: scale(1.18); }
.f1wi-shell .sim-slider:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 0; }
.f1wi-stage { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr); }
/* 24px padding each side: the ported canvas sizes itself to (wrap width - 48) */
.f1wi-canvas-wrap {
  display: flex; align-items: center; justify-content: center; min-width: 0; overflow: hidden; padding: 24px;
  border-right: 1px solid var(--line);
  background: radial-gradient(70% 60% at 50% 0%, color-mix(in srgb, var(--accent) 7%, transparent), transparent 70%), color-mix(in srgb, var(--bg-deep) 45%, transparent);
}
#f1wiCanvas { display: block; max-width: 100%; }
.f1wi-readout { display: flex; flex-direction: column; }
.f1wi-rcell { position: relative; flex: 1; display: flex; flex-direction: column; justify-content: center; padding: clamp(18px, 2.2vw, 28px) clamp(18px, 2.4vw, 32px); }
.f1wi-rcell + .f1wi-rcell { border-top: 1px solid var(--line); }
.f1wi-rcell::before { content: ''; position: absolute; top: clamp(18px, 2.2vw, 28px); left: 0; width: 2px; height: 28px; background: var(--accent); }
.f1wi-rnum { font: 700 clamp(34px, 1.2rem + 2.2vw, 56px)/1 var(--f-disp); letter-spacing: -0.04em; color: var(--text); font-variant-numeric: tabular-nums; }
.f1wi-rcell:first-child .f1wi-rnum { color: var(--accent); }
.f1wi-rlbl { margin-top: 10px; font: 500 11.5px/1.3 var(--f-sans); font-stretch: var(--wd-label); letter-spacing: 0.005em;  color: var(--text-3); }
.sim-footnote { padding: 16px clamp(18px, 2.4vw, 30px) 20px; border-top: 1px solid var(--line); font: 500 12.5px/1.65 var(--f-mono); color: var(--text-3); }

@media (max-width: 960px) {
  .podium-elo-grid { grid-template-columns: minmax(0, 1fr); }
  .f1wi-stage { grid-template-columns: minmax(0, 1fr); }
  .f1wi-canvas-wrap { border-right: 0; border-bottom: 1px solid var(--line); }
  .f1wi-readout { flex-direction: row; }
  .f1wi-rcell + .f1wi-rcell { border-top: 0; border-left: 1px solid var(--line); }
}
@media (max-width: 640px) {
  .f1wi-tabs { margin-left: 0; }
  .f1wi-controls { grid-template-columns: minmax(0, 1fr); }
  .sim-ctrl-grp + .sim-ctrl-grp { border-left: 0; border-top: 1px solid var(--line); }
  .f1wi-readout { flex-direction: column; }
  .f1wi-rcell + .f1wi-rcell { border-left: 0; border-top: 1px solid var(--line); }
  .prob-row { grid-template-columns: 6.6rem minmax(0, 1fr); gap: 12px; }
  .elo-name { width: 6.4rem; }
}