/* Lab Anillo ACT250005 — banco de ensayo, no ficha de producto */
:root {
  --bench: #e6e4de;
  --sheet: #f6f5f1;
  --ink: #1a2330;
  --mute: #3e4956;
  --line: #c5c2b8;
  --copper: #9a4524;
  --well: #1a2330;
  --well-ink: #f3f1ea;
  --serif: "Newsreader", "Iowan Old Style", Palatino, serif;
  --sans: "Source Sans 3", "Segoe UI", sans-serif;
  --max: 1080px;
  --header: 64px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

html, body { margin: 0; }

body {
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.5;
  color: var(--ink);
  background: var(--bench);
  -webkit-font-smoothing: antialiased;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

a { color: inherit; }

:focus-visible {
  outline: 2px solid var(--copper);
  outline-offset: 3px;
}

.skip {
  position: absolute;
  left: 1rem;
  top: 0;
  transform: translateY(-120%);
  background: var(--sheet);
  color: var(--ink);
  padding: 0.6rem 0.8rem;
  z-index: 50;
}

.skip:focus { transform: none; }

.wrap {
  width: min(var(--max), calc(100% - 2.5rem));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--bench);
  border-bottom: 1px solid var(--line);
}

.bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: var(--header);
}

.brand {
  font-family: var(--serif);
  font-size: 1.45rem;
  font-weight: 600;
  text-decoration: none;
  letter-spacing: -0.02em;
}

.brand span {
  font-family: var(--sans);
  font-size: 0.92rem;
  font-weight: 600;
  margin-left: 0.35rem;
  color: var(--mute);
}

.nav-links {
  display: flex;
  gap: 0.25rem;
}

.nav-links a {
  text-decoration: none;
  padding: 0.45rem 0.7rem;
  color: var(--mute);
}

.nav-links a:hover,
.nav-links a.is-current {
  color: var(--ink);
}

.lab-mark {
  margin: 0;
  text-align: right;
  line-height: 1.25;
}

.lab-mark-kicker {
  margin: 0;
  color: var(--mute);
  font-size: 0.88rem;
}

.lab-mark-credit {
  margin: 0.15rem 0 0;
  font-family: var(--serif);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--ink);
}

.hero-credit {
  display: none;
  margin: 1.25rem 0 0;
  color: var(--mute);
  font-size: 0.95rem;
}

.hero {
  padding: clamp(2.2rem, 5vw, 4rem) 0 1rem;
  scroll-margin-top: var(--header);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(280px, 1.08fr);
  gap: clamp(1.5rem, 4vw, 3.5rem);
  align-items: start;
}

.hero-copy {
  border-left: 4px solid var(--copper);
  padding-left: 1.15rem;
  padding-bottom: 0.4rem;
}

.affiliation {
  margin: 0 0 0.9rem;
  color: var(--mute);
  max-width: 36ch;
}

h1, h2 {
  font-family: var(--serif);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.12;
}

h1 {
  margin: 0 0 1rem;
  font-size: clamp(2.35rem, 4.6vw, 3.55rem);
  max-width: 16ch;
}

.lede {
  margin: 0;
  max-width: 38ch;
  color: var(--ink);
}

.bay { min-width: 0; }

.well {
  background: var(--well);
  aspect-ratio: 1;
  max-height: 540px;
  margin-left: auto;
}

#rotor-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.nameplate {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 0.85rem;
  padding-top: 0.85rem;
  border-top: 1px solid var(--line);
}

.nameplate dl {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, auto));
  gap: 0.75rem 1.25rem;
  margin: 0;
}

.nameplate dt {
  color: var(--mute);
  font-size: 0.92rem;
}

.nameplate dd {
  margin: 0.1rem 0 0;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

#bench-toggle {
  font: inherit;
  font-weight: 600;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--ink);
  padding: 0.55rem 0.9rem;
  min-height: 44px;
  cursor: pointer;
}

#bench-toggle:hover { background: var(--sheet); }

.caption {
  margin: 0.7rem 0 0;
  color: var(--mute);
  max-width: 52ch;
  font-size: 0.98rem;
}

.sheet {
  background: var(--sheet);
  padding: clamp(2.5rem, 6vw, 4.25rem) 0;
  scroll-margin-top: var(--header);
}

.sheet-last { padding-bottom: clamp(3rem, 7vw, 5rem); }

h2 {
  margin: 0 0 0.8rem;
  font-size: clamp(1.8rem, 3vw, 2.35rem);
}

.sheet p {
  margin: 0;
  max-width: 62ch;
}

.aims {
  margin: 1.75rem 0 0;
  border-top: 1px solid var(--line);
}

.aims div {
  display: grid;
  grid-template-columns: 13.5rem 1fr;
  gap: 1rem 1.5rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--line);
}

.aims dt { font-weight: 600; }

.aims dd {
  margin: 0;
  color: var(--mute);
}

.note {
  margin-top: 1.4rem !important;
  color: var(--mute);
}

.infographic {
  margin: 2.25rem 0 0;
  padding: 0;
  border: 0;
}

.infographic-title {
  margin: 0 0 1rem;
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 500;
  color: var(--ink);
}

.infographic-svg {
  width: 100%;
  height: auto;
  display: block;
  background: var(--bench);
  border: 1px solid var(--line);
}

.infographic-svg .info-label {
  font-family: "Source Sans 3", sans-serif;
  font-size: 14px;
  font-weight: 600;
  fill: var(--ink);
}

.infographic-svg .info-sub,
.infographic-svg .info-foot {
  font-family: "Source Sans 3", sans-serif;
  font-size: 12px;
  fill: var(--mute);
}

.infographic-svg .info-metric {
  font-family: "Newsreader", serif;
  font-size: 18px;
  font-weight: 600;
  fill: var(--copper);
}

.physics-lede {
  max-width: 62ch;
}

.physics-lede code {
  font-weight: 600;
  color: var(--copper);
}

.physics-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem 1.25rem;
  margin: 1rem 0 0;
  padding: 0;
  list-style: none;
  color: var(--mute);
  font-size: 0.95rem;
}

.physics-legend li {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.swatch {
  width: 0.85rem;
  height: 0.85rem;
  border: 1px solid var(--ink);
  flex-shrink: 0;
}

.swatch-ball { background: #c4622d; }
.swatch-motor { background: #8d939c; }
.swatch-coil { background: #e0884a; }
.swatch-heatsink { background: #6e5436; }
.swatch-shaft { background: #2a3544; }

.matter-fail {
  margin: 0;
  padding: 2rem 1.25rem;
  color: var(--copper);
  font-weight: 600;
}

.physics-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(240px, 0.65fr);
  gap: 1.5rem;
  margin-top: 1.5rem;
  align-items: start;
}

.physics-main {
  min-width: 0;
}

.physics-start-inline {
  display: block;
  width: 100%;
  margin-bottom: 0.65rem;
  font: inherit;
  font-weight: 600;
  padding: 0.75rem 1.1rem;
  min-height: 48px;
  border: 1px solid var(--ink);
  background: var(--sheet);
  color: var(--ink);
  cursor: pointer;
}

.physics-start-inline:hover {
  background: #fff;
}

.physics-stage {
  width: 100%;
  max-width: none;
  margin-inline: 0;
  border: 1px solid var(--line);
  background: #e6e4de;
  overflow: hidden;
  line-height: 0;
  aspect-ratio: 720 / 460;
  contain: layout paint;
}

.physics-canvas {
  display: block;
  width: 100%;
  height: 100%;
  vertical-align: top;
}

.physics-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.85rem;
}

.physics-controls button {
  font: inherit;
  font-weight: 600;
  padding: 0.55rem 0.85rem;
  min-height: 44px;
  border: 1px solid var(--ink);
  background: transparent;
  color: var(--ink);
  cursor: pointer;
}

.physics-controls button:hover:not(:disabled) {
  background: var(--sheet);
}

.physics-controls button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.physics-controls #btn-pause {
  background: var(--ink);
  color: var(--well-ink);
}

.physics-controls #btn-pause:hover:not(:disabled) {
  background: #2a3544;
}

.motion-note {
  margin: 0.75rem 0 0;
  color: var(--mute);
  font-size: 0.95rem;
}

.physics-ficha {
  border: 1px solid var(--line);
  background: var(--bench);
  padding: 1.15rem 1.2rem;
  transition: box-shadow 0.25s ease;
}

.physics-ficha.ficha-hit {
  box-shadow: inset 0 0 0 3px var(--copper);
}

.physics-ficha h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 500;
}

.physics-ficha > p {
  margin: 0.5rem 0 0;
  color: var(--mute);
  font-size: 0.95rem;
}

.physics-ficha dl {
  margin: 1.1rem 0 0;
  border-top: 1px solid var(--line);
}

.physics-ficha dl div {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--line);
}

.physics-ficha dt {
  font-weight: 600;
}

.physics-ficha dd {
  margin: 0;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.hit-log {
  margin: 1rem 0 0;
  padding-left: 1.1rem;
  color: var(--mute);
  font-size: 0.92rem;
}

.hit-log li {
  margin-bottom: 0.35rem;
}

.empty-bench {
  margin-top: 1.5rem;
  display: grid;
  gap: 0.35rem;
  padding-top: 1.15rem;
  border-top: 1px solid var(--line);
}

.empty-bench p { margin: 0; }

.empty-bench code {
  font-family: var(--sans);
  font-weight: 600;
  color: var(--copper);
}

#rive-canvas {
  width: 100%;
  height: 320px;
  display: none;
  margin-top: 1.5rem;
  background: var(--well);
}

.site-footer {
  padding: 1.4rem 0 2.2rem;
  color: var(--mute);
  font-size: 0.95rem;
}

.site-footer .wrap {
  display: flex;
  justify-content: space-between;
  gap: 1rem 2rem;
  flex-wrap: wrap;
}

.site-footer p { margin: 0; max-width: 46ch; }

.infographic-steps {
  display: none;
  margin: 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--line);
  background: var(--bench);
}

.infographic-steps li {
  display: grid;
  grid-template-columns: 2rem 1fr;
  gap: 0.75rem 1rem;
  align-items: start;
  padding: 1rem 1.1rem;
  border-bottom: 1px solid var(--line);
}

.infographic-steps li:last-child {
  border-bottom: 0;
}

.step-num {
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--copper);
  line-height: 1;
}

.infographic-steps strong {
  display: block;
  margin-bottom: 0.15rem;
}

.infographic-foot {
  display: none;
  margin: 0.85rem 0 0;
  color: var(--mute);
  font-size: 0.95rem;
}

@media (max-width: 860px) {
  :root {
    --header: 56px;
  }

  .wrap {
    width: min(var(--max), calc(100% - 1.5rem));
  }

  .hero-grid { grid-template-columns: 1fr; }
  .well { margin-left: 0; max-height: none; }
  .lab-mark { display: none; }
  .hero-credit { display: block; }
  .aims div { grid-template-columns: 1fr; gap: 0.25rem; }
  .physics-grid { grid-template-columns: 1fr; }

  .infographic-svg { display: none; }
  .infographic-steps { display: block; }
  .infographic-foot { display: block; }
}

@media (max-width: 640px) {
  body {
    font-size: 1rem;
  }

  .wrap {
    width: min(var(--max), calc(100% - 1.15rem));
  }

  .site-header {
    padding-left: env(safe-area-inset-left);
    padding-right: env(safe-area-inset-right);
  }

  .bar {
    flex-wrap: wrap;
    align-items: flex-start;
    gap: 0.65rem;
    padding: 0.65rem 0;
    min-height: auto;
  }

  .brand {
    font-size: 1.25rem;
    flex: 1 1 auto;
    min-width: 0;
  }

  .brand span {
    display: block;
    margin: 0.1rem 0 0;
    font-size: 0.82rem;
  }

  .nav-links {
    flex: 1 1 100%;
    order: 3;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    gap: 0.15rem;
    padding-bottom: 0.15rem;
    mask-image: linear-gradient(to right, transparent, #000 8px, #000 calc(100% - 8px), transparent);
  }

  .nav-links::-webkit-scrollbar {
    display: none;
  }

  .nav-links a {
    flex-shrink: 0;
    font-size: 0.92rem;
    padding: 0.5rem 0.65rem;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
  }

  .hero {
    padding-top: 1.75rem;
  }

  .hero-copy {
    padding-left: 0.85rem;
    border-left-width: 3px;
  }

  h1 {
    max-width: none;
    font-size: clamp(1.85rem, 8.5vw, 2.5rem);
  }

  .lede,
  .affiliation,
  .sheet p,
  .physics-lede,
  .caption {
    max-width: none;
  }

  .nameplate {
    flex-direction: column;
    align-items: stretch;
  }

  .nameplate dl {
    grid-template-columns: 1fr 1fr;
    gap: 0.65rem 0.75rem;
  }

  #bench-toggle {
    width: 100%;
  }

  .physics-legend {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem 0.75rem;
    font-size: 0.88rem;
  }

  .physics-controls {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
  }

  .physics-controls button {
    width: 100%;
    min-height: 48px;
    font-size: 0.92rem;
    padding: 0.65rem 0.5rem;
  }

  .physics-start-inline {
    min-height: 48px;
  }

  .site-footer {
    padding-bottom: calc(1.5rem + env(safe-area-inset-bottom));
  }

  .site-footer .wrap {
    flex-direction: column;
    gap: 0.65rem;
  }

  .site-footer p {
    max-width: none;
  }

  #rive-canvas {
    height: min(52vw, 280px);
  }
}