:root {
  color-scheme: dark;
  --ink: #050b09;
  --panel: #0d1b17;
  --panel-2: #12241e;
  --line: #274138;
  --text: #f5f7f2;
  --muted: #a4b4ac;
  --lime: #c9ff52;
  --mint: #67e6b4;
  --danger: #ff8e86;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; }
html:not(.intro-complete) { overflow: hidden; }
body {
  margin: 0;
  color: var(--text);
  background: radial-gradient(circle at 75% 34%, #17392d 0, var(--ink) 34rem);
  min-height: 100vh;
}
button, input { font: inherit; }
button, a, label { -webkit-tap-highlight-color: transparent; }
button:focus-visible, a:focus-visible, input:focus-visible, .drop-zone:focus-within {
  outline: 3px solid var(--mint);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  top: .75rem;
  left: .75rem;
  transform: translateY(-160%);
  visibility: hidden;
  opacity: 0;
  background: var(--lime);
  color: var(--ink);
  padding: .7rem 1rem;
  z-index: 100;
}
.skip-link:focus { transform: none; visibility: visible; opacity: 1; }

footer {
  width: min(1180px, calc(100% - 2rem));
  margin-inline: auto;
}

main { width: 100%; }
.hero {
  position: relative;
  min-height: max(650px, 100svh);
  overflow: hidden;
  isolation: isolate;
  background: #020605;
}
.hero-film {
  position: absolute;
  z-index: 10;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  filter: brightness(.94) saturate(.9) contrast(1.04);
  transform: scale(1.02);
  animation: film-in 5s cubic-bezier(.2, .65, .25, 1) both;
}
.hero-surface {
  position: absolute;
  z-index: 0;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 50% 42%;
  opacity: 0;
  transform: scale(1.065);
  filter: brightness(.76) saturate(.82) contrast(1.08);
}
.hero-shade {
  position: absolute;
  z-index: 1;
  inset: 0;
  opacity: 0;
  background:
    linear-gradient(90deg, #020504e8 0%, #020504a3 35%, transparent 70%),
    linear-gradient(180deg, #0205048f 0%, transparent 28%, transparent 52%, #020504e8 100%);
}
.analysis-overlay {
  position: absolute;
  z-index: 2;
  inset: 0;
  overflow: hidden;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}
.analysis-geometry {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  fill: none;
  stroke: var(--lime);
  stroke-width: .75;
  opacity: .72;
  vector-effect: non-scaling-stroke;
}
.analysis-axis {
  opacity: .24;
  stroke: #d7e0dc;
  stroke-dasharray: 3 8;
  stroke-dashoffset: 80;
}
.analysis-orbit,
.analysis-callout {
  stroke-dasharray: 1800;
  stroke-dashoffset: 1800;
}
.analysis-orbit--swing { opacity: .75; }
.analysis-orbit--echo { opacity: .45; }
.analysis-callout {
  stroke: #e8eee9;
  stroke-width: .6;
  opacity: .52;
}
.tracking-node {
  position: absolute;
  width: 1.15rem;
  height: 1.15rem;
  display: grid;
  place-items: center;
  border: 1px solid #d6ff7870;
  border-radius: 50%;
  background: #c9ff5217;
  box-shadow: 0 0 0 0 #c9ff5238;
  opacity: 0;
  transform: translate(-50%, -50%) scale(.35);
}
.tracking-node::before {
  content: "";
  width: .4rem;
  height: .4rem;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 1.1rem #c9ff52;
}
.tracking-node i {
  position: absolute;
  width: 2.5rem;
  height: 1px;
  left: 50%;
  top: 50%;
  background: linear-gradient(90deg, #c9ff5290, transparent);
  transform-origin: left;
  transform: rotate(32deg);
}
.tracking-node--shoulder { left: 51%; top: 39%; }
.tracking-node--hip { left: 48%; top: 68%; }
.tracking-node--contact {
  left: 75%;
  top: 55%;
  width: 2rem;
  height: 2rem;
}
.metric {
  position: absolute;
  display: flex;
  align-items: stretch;
  gap: .7rem;
  color: #f6faf7;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: .61rem;
  line-height: 1.35;
  letter-spacing: .09em;
  text-transform: uppercase;
  text-shadow: 0 2px 9px #000;
  opacity: 0;
  transform: translateY(.65rem);
}
.metric > i {
  width: 1px;
  min-height: 2.25rem;
  background: var(--lime);
  box-shadow: 0 0 .75rem #c9ff5270;
}
.metric b,
.metric strong { display: block; }
.metric b { font-size: .56rem; font-weight: 560; color: #d7dfda; }
.metric strong { margin-top: .18rem; color: var(--lime); font-size: .72rem; font-weight: 700; }
.metric--shoulder { left: 4%; top: 22%; }
.metric--contact { left: 62%; top: 57%; }
.metric--path { right: 4%; bottom: 13%; }
.hero-grain {
  position: absolute;
  z-index: 3;
  inset: 0;
  opacity: 0;
  mix-blend-mode: soft-light;
  pointer-events: none;
  background-image:
    repeating-radial-gradient(circle at 20% 30%, #fff 0, #fff .55px, transparent .75px, transparent 3px);
  background-size: 5px 5px;
}
.hero-content {
  position: relative;
  z-index: 4;
  width: min(1180px, calc(100% - 2rem));
  min-height: max(650px, 100svh);
  margin-inline: auto;
  padding: 9rem 0 clamp(7.5rem, 13vh, 10rem);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  align-items: flex-start;
  visibility: hidden;
}
.eyebrow, .step-label {
  color: var(--lime);
  text-transform: uppercase;
  letter-spacing: .16em;
  font-size: .72rem;
  font-weight: 760;
}
.hero-eyebrow {
  display: flex;
  align-items: center;
  gap: .7rem;
  margin: 0 0 1.25rem;
  opacity: 0;
  transform: translateY(1rem);
}
.hero-eyebrow span {
  width: 2.8rem;
  height: 1px;
  background: var(--lime);
  transform-origin: left;
  transform: scaleX(0);
}
h1 {
  max-width: 930px;
  font-family: Georgia, Cambria, "Times New Roman", Times, serif;
  font-size: clamp(4.2rem, 7.5vw, 7.15rem);
  letter-spacing: -.058em;
  line-height: .88;
  margin: 0;
  font-weight: 400;
  text-wrap: balance;
  text-shadow: 0 4px 35px #0009;
}
h1 em { color: var(--lime); font-style: italic; font-weight: 400; }
.hero-line {
  display: block;
  overflow: hidden;
  padding: 0 .08em .08em 0;
}
.hero-line > span {
  display: block;
  transform: translateY(115%);
}
.lede {
  max-width: 680px;
  color: var(--muted);
  font-size: clamp(1rem, 2vw, 1.25rem);
  line-height: 1.65;
}
.hero-lede {
  max-width: 450px;
  margin: 1.45rem 0 1.65rem;
  color: #d2dad5;
  font-size: clamp(.95rem, 1.4vw, 1.08rem);
  line-height: 1.55;
  opacity: 0;
  transform: translateY(1rem);
}
.hero-cta {
  min-width: 205px;
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: .45rem 0 .55rem;
  border: 0;
  border-bottom: 1px solid #ffffff61;
  border-radius: 0;
  color: var(--text);
  text-decoration: none;
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  background: transparent;
  transition: color .25s, background .25s, border-color .25s, transform .25s;
  opacity: 0;
}
.hero-cta span {
  width: 2rem;
  height: 2rem;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: var(--ink);
  background: var(--lime);
  font-size: 1.1rem;
  transition: transform .25s;
}
.hero-cta:hover {
  color: var(--lime);
  background: transparent;
  border-color: var(--lime);
  transform: translateX(.25rem);
}
.hero-cta:hover span { transform: rotate(-45deg); }
.hero-meta {
  position: absolute;
  z-index: 4;
  left: 50%;
  bottom: 2rem;
  width: min(1180px, calc(100% - 2rem));
  display: grid;
  grid-template-columns: auto minmax(100px, 220px) auto;
  align-items: center;
  justify-content: start;
  gap: 1.25rem;
  color: #d4dcd7;
  text-transform: uppercase;
  letter-spacing: .13em;
  font-size: .62rem;
  opacity: 0;
  transform: translate(-50%, 1rem);
}
.hero-timeline {
  height: 1px;
  overflow: hidden;
  background: #ffffff42;
}
.hero-timeline i {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--lime);
  transform: translateX(-100%);
}
.intro-complete .hero-film {
  animation: film-settle 1.8s .05s ease forwards;
  pointer-events: none;
}
.intro-complete .hero-surface {
  animation: surface-in 2.2s .05s cubic-bezier(.2, .72, .2, 1) both;
}
.intro-complete .hero-shade {
  animation: shade-in 1.8s .05s ease forwards;
}
.intro-complete .hero-grain {
  animation: grain-in 1.8s .35s ease forwards;
}
.intro-complete .analysis-overlay {
  visibility: visible;
  animation: overlay-in 1.4s .65s ease both;
}
.intro-complete .analysis-axis {
  animation: axis-scan 2s .75s cubic-bezier(.2, .75, .25, 1) both;
}
.intro-complete .analysis-orbit,
.intro-complete .analysis-callout {
  animation: trace-draw 2.4s .85s cubic-bezier(.2, .72, .2, 1) forwards;
}
.intro-complete .analysis-orbit--swing { animation-delay: 1.05s; }
.intro-complete .analysis-orbit--echo { animation-delay: 1.25s; }
.intro-complete .analysis-callout--contact { animation-delay: 1.45s; }
.intro-complete .analysis-callout--shoulder { animation-delay: 1.1s; }
.intro-complete .tracking-node {
  animation: tracker-in .8s 1.15s cubic-bezier(.18, .9, .25, 1.3) both,
    tracker-pulse 1.8s 1.95s ease-out 2;
}
.intro-complete .tracking-node--hip { animation-delay: 1.4s, 2.2s; }
.intro-complete .tracking-node--contact { animation-delay: 1.65s, 2.45s; }
.intro-complete .metric {
  animation: metric-in .9s 1.35s cubic-bezier(.2, .75, .25, 1) both;
}
.intro-complete .metric--contact { animation-delay: 1.7s; }
.intro-complete .metric--path { animation-delay: 2.05s; }
.intro-complete .hero-content { visibility: visible; }
.intro-complete .hero-eyebrow {
  animation: fade-up 1s .45s cubic-bezier(.2, .75, .25, 1) both;
}
.intro-complete .hero-eyebrow span {
  animation: line-grow 1.2s .5s cubic-bezier(.2, .75, .25, 1) both;
}
.intro-complete .hero-line > span {
  animation: title-rise 1.4s .8s cubic-bezier(.16, 1, .3, 1) forwards;
}
.intro-complete .hero-line + .hero-line > span { animation-delay: 1.08s; }
.intro-complete .hero-lede {
  animation: fade-up 1.2s 1.65s cubic-bezier(.2, .75, .25, 1) both;
}
.intro-complete .hero-cta {
  animation: fade-in 1.2s 2.05s ease both;
}
.intro-complete .hero-meta {
  animation: meta-in 1s 2.35s cubic-bezier(.2, .75, .25, 1) both;
}
.intro-complete .hero-timeline i {
  animation: timeline 2s 2.65s cubic-bezier(.2, .75, .25, 1) forwards;
}

.racket-story {
  position: relative;
  height: 550svh;
  background: #020504;
}
.racket-story__stage {
  position: sticky;
  top: 0;
  height: 100svh;
  min-height: 620px;
  overflow: hidden;
  isolation: isolate;
  background: #020504;
}
.racket-story__canvas {
  position: absolute;
  z-index: 0;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  filter: brightness(.82) saturate(.76) contrast(1.14);
  transform: scale(1.01);
}
.racket-story__shade {
  position: absolute;
  z-index: 1;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(90deg, #020504a8 0%, transparent 30%, transparent 70%, #0205048f 100%),
    linear-gradient(180deg, #020504b8 0%, transparent 24%, transparent 72%, #020504d9 100%);
}
.racket-story__grain {
  position: absolute;
  z-index: 2;
  inset: 0;
  opacity: .09;
  pointer-events: none;
  mix-blend-mode: soft-light;
  background-image: repeating-radial-gradient(circle at 65% 25%, #fff 0, #fff .55px, transparent .8px, transparent 3px);
  background-size: 5px 5px;
}
.racket-story__meta {
  position: absolute;
  z-index: 4;
  top: clamp(1.25rem, 3vw, 2.5rem);
  left: 50%;
  width: min(1180px, calc(100% - 2rem));
  display: grid;
  grid-template-columns: auto minmax(100px, 240px) auto;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  color: #c8d1cc;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: .61rem;
  line-height: 1;
  letter-spacing: .14em;
  text-transform: uppercase;
  transform: translateX(-50%);
}
.racket-story__progress {
  display: block;
  width: min(18vw, 240px);
  height: 1px;
  overflow: hidden;
  background: #ffffff42;
}
.racket-story__progress i {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--lime);
  box-shadow: 0 0 .75rem #c9ff5290;
  transform: scaleX(0);
  transform-origin: left;
}
.racket-story__copy {
  position: absolute;
  z-index: 3;
  inset: 0;
  pointer-events: none;
}
.story-copy {
  position: absolute;
  width: min(34rem, calc(100% - 2rem));
  opacity: 0;
  visibility: hidden;
  transform: translateY(1.5rem);
  transition: opacity .35s ease, transform .55s cubic-bezier(.2, .75, .2, 1), visibility .35s;
  will-change: opacity, transform;
}
.story-copy.is-active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.story-copy--left {
  top: clamp(9rem, 25vh, 15rem);
  left: max(1rem, calc((100vw - 1180px) / 2));
}
.story-copy--center {
  top: 47%;
  left: 50%;
  width: min(31rem, calc(100% - 2rem));
  text-align: center;
  translate: -50% -50%;
}
.story-copy--right {
  top: clamp(9rem, 28vh, 17rem);
  right: max(1rem, calc((100vw - 1180px) / 2));
  width: min(31rem, calc(100% - 2rem));
}
.story-copy__index {
  display: flex;
  align-items: center;
  gap: .7rem;
  margin: 0 0 1.1rem;
  color: var(--lime) !important;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: .65rem !important;
  font-weight: 700;
  line-height: 1 !important;
  letter-spacing: .15em;
  text-transform: uppercase;
}
.story-copy__index::before {
  content: "";
  width: 2.5rem;
  height: 1px;
  background: var(--lime);
  box-shadow: 0 0 .65rem #c9ff527a;
}
.story-copy--center .story-copy__index { justify-content: center; }
.story-copy h2 {
  max-width: 100%;
  margin: 0;
  color: #f1f5f2;
  font-family: Georgia, Cambria, "Times New Roman", Times, serif;
  font-size: clamp(3rem, 5.25vw, 5.2rem);
  font-weight: 400;
  line-height: .94;
  letter-spacing: -.055em;
  text-wrap: balance;
  text-shadow: 0 4px 32px #000, 0 1px 8px #000;
}
.story-copy p:not(.story-copy__index) {
  max-width: 28rem;
  margin: 1.25rem 0 0;
  color: #c9d2cd;
  font-size: clamp(.92rem, 1.4vw, 1.08rem);
  line-height: 1.6;
  text-shadow: 0 2px 15px #000;
}
.story-copy--center p:not(.story-copy__index) { margin-inline: auto; }
.story-copy a {
  width: fit-content;
  margin-top: 1.5rem;
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  padding-bottom: .45rem;
  border-bottom: 1px solid #ffffff63;
  color: #f1f5f2;
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-decoration: none;
  text-transform: uppercase;
  pointer-events: auto;
  transition: color .25s, border-color .25s;
}
.story-copy a span { color: var(--lime); font-size: 1rem; }
.story-copy a:hover { color: var(--lime); border-color: var(--lime); }
.racket-story__hint {
  position: absolute;
  z-index: 4;
  left: 50%;
  bottom: 1.35rem;
  margin: 0;
  display: flex;
  align-items: center;
  gap: .65rem;
  color: #aeb8b2;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: .58rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  transform: translateX(-50%);
}
.racket-story__hint span {
  display: block;
  width: 1.8rem;
  height: 1px;
  overflow: hidden;
  background: linear-gradient(90deg, var(--lime) 50%, #ffffff32 50%);
  background-size: 200% 100%;
  animation: scroll-hint 1.8s ease-in-out infinite;
}
.racket-story.frames-unavailable .racket-story__canvas { opacity: 0; }

.racket-story.is-static {
  height: auto;
}
.racket-story.is-static .racket-story__stage {
  position: relative;
  height: auto;
  min-height: 100svh;
}
.racket-story.is-static .racket-story__canvas { filter: brightness(.33) saturate(.65); }
.racket-story.is-static .racket-story__copy {
  position: relative;
  width: min(1180px, calc(100% - 2rem));
  margin-inline: auto;
  padding: 8rem 0 5rem;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 3rem clamp(2rem, 7vw, 7rem);
}
.racket-story.is-static .story-copy {
  position: relative;
  inset: auto;
  width: auto;
  padding-top: 1.3rem;
  border-top: 1px solid #ffffff2b;
  opacity: 1 !important;
  visibility: visible !important;
  text-align: left;
  translate: none;
  transform: none !important;
}
.racket-story.is-static .story-copy__index { justify-content: flex-start; }
.racket-story.is-static .story-copy h2 { font-size: clamp(2.3rem, 4vw, 4rem); }
.racket-story.is-static .story-copy--center p:not(.story-copy__index) { margin-inline: 0; }
.racket-story.is-static .racket-story__hint,
.racket-story.is-static .racket-story__progress { display: none; }

.availability {
  width: min(1180px, calc(100% - 2rem));
  margin-inline: auto;
  padding: clamp(5rem, 10vw, 8rem) clamp(1.3rem, 3vw, 2.2rem);
  scroll-margin-top: 1rem;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.availability__content {
  margin-top: 1.5rem;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(17rem, .85fr);
  align-items: end;
  gap: clamp(2rem, 7vw, 7rem);
}
.availability h2 {
  max-width: 13ch;
  margin: 0;
  font-size: clamp(3rem, 7vw, 6.5rem);
  line-height: .9;
  letter-spacing: -.07em;
}
.availability__content > div { max-width: 34rem; }
.availability__content p {
  margin: 0;
  color: var(--muted);
  font-size: clamp(1rem, 1.5vw, 1.15rem);
  line-height: 1.7;
}
.availability__status {
  display: inline-flex;
  align-items: center;
  gap: .65rem;
  margin-top: 1.75rem;
  color: var(--lime);
  font-family: var(--mono);
  font-size: .76rem;
  letter-spacing: .09em;
  text-transform: uppercase;
}
.availability__status i {
  width: .55rem;
  height: .55rem;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 1rem color-mix(in srgb, var(--lime) 70%, transparent);
}

.analysis-access {
  width: min(1180px, calc(100% - 2rem));
  margin-inline: auto;
  padding: clamp(5rem, 10vw, 8rem) 0 0;
  scroll-margin-top: 1rem;
}
.analysis-access__heading {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(17rem, .85fr);
  align-items: end;
  gap: clamp(2rem, 7vw, 7rem);
  padding-bottom: clamp(2rem, 5vw, 4rem);
  border-bottom: 1px solid var(--line);
}
.analysis-access__heading h2 {
  max-width: 12ch;
  margin: .45rem 0 0;
  font-size: clamp(3rem, 7vw, 6.5rem);
  line-height: .9;
  letter-spacing: -.07em;
}
.analysis-access__heading > p {
  margin: 0;
  color: var(--muted);
  font-size: clamp(1rem, 1.5vw, 1.15rem);
  line-height: 1.7;
}
.configuration-panel {
  margin-top: 1rem;
  padding: 1rem 1.2rem;
  border: 1px solid #796b32;
  border-radius: .9rem;
  background: #211e0c;
}
.configuration-panel p { margin: .35rem 0 0; color: #ddd09a; }
.auth-card {
  margin: clamp(2rem, 5vw, 4rem) auto 0;
  max-width: 760px;
  display: grid;
  grid-template-columns: .8fr 1.2fr;
  gap: clamp(1.5rem, 5vw, 4rem);
  padding: clamp(1.4rem, 4vw, 2.5rem);
  background: color-mix(in srgb, var(--panel) 94%, transparent);
  border: 1px solid var(--line);
  border-radius: 1.35rem;
  box-shadow: 0 25px 80px #0005;
}
.auth-card h3 { margin: 0; font-size: clamp(1.8rem, 4vw, 2.6rem); letter-spacing: -.045em; }
.auth-card > div > p:last-child { color: var(--muted); line-height: 1.55; }
.auth-card form { display: grid; gap: .55rem; }
.auth-card label { margin-top: .35rem; color: var(--muted); font-size: .82rem; }
.auth-card input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: .75rem;
  padding: .85rem .9rem;
  color: var(--text);
  background: #09130f;
}
.auth-actions {
  margin-top: .75rem;
}
#auth-submit {
  width: 100%;
  border-radius: .8rem;
  padding: .9rem 1.1rem;
  font-weight: 800;
  cursor: pointer;
}
#auth-submit {
  border: 0;
  display: flex;
  justify-content: space-between;
  color: var(--ink);
  background: var(--lime);
}
#auth-submit:disabled { opacity: .55; cursor: wait; }
.form-message { min-height: 1.25rem; margin: .2rem 0 0; color: var(--danger); font-size: .8rem; }
.session-bar {
  margin-top: 1rem;
  padding: .8rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  border: 1px solid var(--line);
  border-radius: .9rem;
  color: var(--muted);
  background: #09130f;
}
.session-bar > div { display: flex; align-items: center; gap: .45rem; min-width: 0; }
.session-bar strong { overflow: hidden; color: var(--text); text-overflow: ellipsis; white-space: nowrap; }
.session-dot {
  width: .55rem;
  height: .55rem;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 .85rem color-mix(in srgb, var(--lime) 70%, transparent);
}

.workspace, .progress-panel, .error-panel, .results {
  width: min(1180px, calc(100% - 2rem));
  margin-inline: auto;
}
.workspace {
  padding-top: clamp(2rem, 5vw, 4rem);
  display: grid;
  grid-template-columns: 1.25fr .75fr;
  gap: 1rem;
  scroll-margin-top: 1rem;
}
.upload-card, .capture-card, .score-card, .feedback-card, .replay-card, .progress-panel, .error-panel {
  background: color-mix(in srgb, var(--panel) 94%, transparent);
  border: 1px solid var(--line);
  border-radius: 1.35rem;
  padding: clamp(1.3rem, 3vw, 2.2rem);
  box-shadow: 0 25px 80px #0005;
}
.step-label { display: flex; align-items: center; gap: .6rem; margin-bottom: 1.5rem; }
.step-label span {
  border: 1px solid var(--line);
  color: var(--muted);
  border-radius: 50%;
  width: 1.8rem;
  height: 1.8rem;
  display: grid;
  place-items: center;
  font-size: .65rem;
}
.drop-zone {
  min-height: 220px;
  border: 1px dashed #557267;
  border-radius: 1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  cursor: pointer;
  text-align: center;
  background: #0a1713;
  transition: border-color .2s, background .2s, transform .2s;
}
.drop-zone:hover, .drop-zone.dragging {
  border-color: var(--lime);
  background: #12241b;
  transform: translateY(-2px);
}
.drop-zone input { position: absolute; opacity: 0; pointer-events: none; }
.upload-icon {
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  background: var(--lime);
  color: var(--ink);
  display: grid;
  place-items: center;
  font-size: 1.7rem;
  margin-bottom: .35rem;
}
.drop-zone span:last-child { color: var(--muted); font-size: .86rem; }
fieldset { border: 0; margin: 1.6rem 0; padding: 0; }
legend { font-weight: 700; margin-bottom: .65rem; }
.segmented {
  display: flex;
  background: #09130f;
  padding: .25rem;
  border: 1px solid var(--line);
  border-radius: .8rem;
}
.segmented label { flex: 1; cursor: pointer; }
.segmented input { position: absolute; opacity: 0; }
.segmented span {
  display: block;
  text-align: center;
  border-radius: .6rem;
  padding: .65rem;
  color: var(--muted);
}
.segmented input:checked + span {
  background: var(--panel-2);
  color: var(--text);
  box-shadow: 0 0 0 1px var(--line);
}
#submit-button, #retry-button {
  width: 100%;
  border: 0;
  border-radius: .8rem;
  padding: .95rem 1.2rem;
  background: var(--lime);
  color: var(--ink);
  font-weight: 800;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
#submit-button:disabled { opacity: .55; cursor: wait; }
.fine-print { color: var(--muted); font-size: .76rem; text-align: center; margin: .8rem 0 0; }
.capture-card h2 { font-size: 2rem; letter-spacing: -.04em; }
.capture-card ul { list-style: none; margin: 1.5rem 0 0; padding: 0; }
.capture-card li {
  display: grid;
  gap: .25rem;
  padding: 1rem 0;
  border-top: 1px solid var(--line);
}
.capture-card li span { color: var(--muted); line-height: 1.5; }
.progress-panel, .error-panel, .results { margin-top: 1rem; }
.progress-panel { display: flex; align-items: center; gap: 1.5rem; }
.progress-panel[hidden], .error-panel[hidden], .results[hidden] { display: none; }
.spinner {
  width: 3.2rem;
  height: 3.2rem;
  border: 4px solid var(--line);
  border-top-color: var(--lime);
  border-radius: 50%;
  animation: spin .8s linear infinite;
  flex: 0 0 auto;
}
.error-panel { border-color: #6c3834; }
.error-panel p { color: var(--danger); }
.results { padding-top: 4rem; }
.results-heading {
  display: flex;
  justify-content: space-between;
  align-items: end;
  margin-bottom: 1rem;
}
.results h2 {
  font-size: clamp(2.2rem, 5vw, 4rem);
  letter-spacing: -.06em;
  margin: .35rem 0;
}
.quiet-button {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--muted);
  padding: .65rem .9rem;
  border-radius: .7rem;
  cursor: pointer;
}
.result-grid { display: grid; grid-template-columns: .65fr 1.35fr; gap: 1rem; }
.score-card h3, .feedback-card h3, .replay-card h3 { margin-top: 0; }
.score-ring {
  --score: 0deg;
  width: min(240px, 70vw);
  aspect-ratio: 1;
  margin: 1.6rem auto;
  border-radius: 50%;
  display: grid;
  place-content: center;
  text-align: center;
  background: radial-gradient(circle, var(--panel) 61%, transparent 62%), conic-gradient(var(--lime) var(--score), #24382f 0);
}
.score-ring strong { font-size: 4rem; letter-spacing: -.07em; line-height: .9; }
.score-ring span { color: var(--muted); }
.score-card > p { color: var(--muted); line-height: 1.5; }
.feedback-card ol { list-style: none; padding: 0; margin: 0; counter-reset: cue; }
.feedback-card li {
  counter-increment: cue;
  padding: 1.15rem 0 1.15rem 3rem;
  border-top: 1px solid var(--line);
  position: relative;
}
.feedback-card li::before {
  content: "0" counter(cue);
  position: absolute;
  left: 0;
  color: var(--lime);
  font: 700 .72rem ui-monospace, monospace;
}
.feedback-card li strong { display: block; margin-bottom: .45rem; }
.feedback-card li p { color: var(--muted); margin: 0; line-height: 1.55; }
.replay-card { margin-top: 1rem; }
.replay-card video {
  width: 100%;
  max-height: 70vh;
  border-radius: .8rem;
  background: #000;
  margin: 1rem 0;
}
.download-link { color: var(--lime); font-weight: 700; }
footer {
  border-top: 1px solid var(--line);
  margin-top: 6rem;
  padding: 2rem 0 3rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  color: var(--muted);
  font-size: .8rem;
}

@keyframes film-in {
  from { transform: scale(1.075); }
  to { transform: scale(1.02); }
}
@keyframes film-settle {
  from { opacity: 1; transform: scale(1.02); }
  to { opacity: 0; transform: scale(1.045); }
}
@keyframes surface-in {
  from { opacity: 0; transform: scale(1.065); filter: brightness(.58) saturate(.7) contrast(1.08); }
  to { opacity: 1; transform: scale(1); filter: brightness(.76) saturate(.82) contrast(1.08); }
}
@keyframes shade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes grain-in {
  from { opacity: 0; }
  to { opacity: .08; }
}
@keyframes overlay-in {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes axis-scan {
  from { opacity: 0; stroke-dashoffset: 80; }
  to { opacity: .24; stroke-dashoffset: 0; }
}
@keyframes trace-draw { to { stroke-dashoffset: 0; } }
@keyframes tracker-in {
  from { opacity: 0; transform: translate(-50%, -50%) scale(.35); }
  to { opacity: 1; transform: translate(-50%, -50%) scale(1); }
}
@keyframes tracker-pulse {
  0% { box-shadow: 0 0 0 0 #c9ff5250; }
  70% { box-shadow: 0 0 0 1rem #c9ff5200; }
  100% { box-shadow: 0 0 0 0 #c9ff5200; }
}
@keyframes metric-in {
  from { opacity: 0; transform: translateY(.65rem); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fade-up {
  from { opacity: 0; transform: translateY(1rem); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes title-rise { to { transform: translateY(0); } }
@keyframes line-grow {
  from { transform: scaleX(0); }
  to { transform: scaleX(1); }
}
@keyframes meta-in {
  from { opacity: 0; transform: translate(-50%, 1rem); }
  to { opacity: 1; transform: translate(-50%, 0); }
}
@keyframes timeline { to { transform: translateX(-36%); } }
@keyframes scroll-hint {
  0%, 100% { background-position: 100% 0; }
  50% { background-position: 0 0; }
}
@keyframes spin { to { transform: rotate(360deg); } }

@media (max-width: 760px) {
  .hero {
    min-height: max(620px, 100svh);
    background-position: 52% center;
  }
  .hero-film { object-position: 45% center; }
  .hero-surface { object-position: 50% center; }
  .hero-shade {
    background:
      linear-gradient(90deg, #020504a6 0%, transparent 85%),
      linear-gradient(180deg, #020504ad 0%, transparent 26%, transparent 45%, #020504ef 92%);
  }
  .hero-content {
    min-height: max(620px, 100svh);
    padding: 7rem 0 7.4rem;
  }
  h1 {
    max-width: 100%;
    font-size: clamp(3.15rem, 13.5vw, 4.4rem);
    line-height: .9;
  }
  .hero-lede { max-width: 25rem; margin-top: 1rem; font-size: .95rem; }
  .hero-cta { min-width: 190px; }
  .analysis-geometry {
    width: 126%;
    left: -13%;
  }
  .tracking-node--shoulder { left: 48%; top: 43%; }
  .tracking-node--hip { left: 43%; top: 61%; }
  .tracking-node--contact { left: 84%; top: 52%; }
  .metric--shoulder { left: 1rem; top: 17%; }
  .metric--contact { left: auto; right: 1rem; top: 47%; }
  .metric--path { display: none; }
  .hero-meta {
    bottom: 1.35rem;
    grid-template-columns: auto 1fr;
  }
  .hero-meta > span:last-child { display: none; }
  .racket-story { height: 500svh; }
  .racket-story__stage { min-height: 600px; }
  .racket-story__canvas {
    height: 64%;
    bottom: auto;
  }
  .racket-story__shade {
    background:
      linear-gradient(180deg, #02050494 0%, transparent 16%, transparent 44%, #020504 68%, #020504 100%),
      linear-gradient(90deg, #02050475 0%, transparent 50%, #02050475 100%);
  }
  .racket-story__meta {
    grid-template-columns: auto minmax(80px, 1fr);
    gap: .8rem;
  }
  .racket-story__meta > span:last-child { display: none; }
  .racket-story__progress { width: 100%; }
  .story-copy,
  .story-copy--left,
  .story-copy--center,
  .story-copy--right {
    top: auto;
    right: 1rem;
    bottom: 4.5rem;
    left: 1rem;
    width: auto;
    text-align: left;
    translate: none;
  }
  .story-copy--center .story-copy__index { justify-content: flex-start; }
  .story-copy h2 { font-size: clamp(2.7rem, 12vw, 4rem); }
  .story-copy p:not(.story-copy__index) { max-width: 24rem; font-size: .91rem; }
  .story-copy--center p:not(.story-copy__index) { margin-inline: 0; }
  .racket-story__hint { left: 1rem; transform: none; }
  .racket-story.is-static .racket-story__copy { grid-template-columns: 1fr; }
  .workspace, .result-grid, .availability__content, .analysis-access__heading, .auth-card { grid-template-columns: 1fr; }
  .session-bar { align-items: flex-start; flex-direction: column; }
  .results-heading, footer { align-items: flex-start; flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    animation-duration: .01ms !important;
    animation-delay: 0ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
  .hero-line > span { transform: none; }
  .hero-timeline i { transform: none; }
  .racket-story { height: auto; }
  .racket-story__stage { position: relative; height: auto; min-height: 100svh; }
  .racket-story__hint,
  .racket-story__progress { display: none; }
  .racket-story__copy {
    position: relative;
    width: min(1180px, calc(100% - 2rem));
    margin-inline: auto;
    padding: 8rem 0 5rem;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 3rem;
  }
  .story-copy,
  .story-copy--left,
  .story-copy--center,
  .story-copy--right {
    position: relative;
    inset: auto;
    width: auto;
    padding-top: 1.3rem;
    border-top: 1px solid #ffffff2b;
    opacity: 1;
    visibility: visible;
    text-align: left;
    translate: none;
    transform: none;
  }
  .story-copy--center .story-copy__index { justify-content: flex-start; }
  .story-copy--center p:not(.story-copy__index) { margin-inline: 0; }
}

@media (max-width: 760px) and (prefers-reduced-motion: reduce) {
  .racket-story__copy { grid-template-columns: 1fr; }
}