:root {
  color-scheme: dark;
  --ink: #f3f0e8;
  --muted: #a9aaa4;
  --panel: rgba(255, 255, 255, 0.045);
  --line: rgba(255, 255, 255, 0.12);
  --cyan: #5ee4d0;
  --amber: #f7b955;
  --coral: #ff6f61;
  --bg: #0b1013;
  --bg2: #121b1f;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  overflow-x: hidden;
  color: var(--ink);
  background:
    radial-gradient(circle at 80% 10%, rgba(94, 228, 208, 0.09), transparent 32rem),
    linear-gradient(145deg, var(--bg), var(--bg2));
}

button, input { font: inherit; }

.app-shell { width: min(1420px, 100%); margin: 0 auto; padding: 20px clamp(18px, 4vw, 64px) 16px; }
.simulation-navigator { position: relative; z-index: 10; display: flex; align-items: center; justify-content: flex-start; gap: 2px; min-height: 40px; margin-bottom: 12px; }
.navigator-picker { position: relative; }
.navigator-trigger { display: flex; align-items: center; gap: 8px; padding: 8px 10px; border: 0; border-radius: 9px; color: var(--ink); background: transparent; font-size: .86rem; font-weight: 700; cursor: pointer; }
.navigator-picker:first-child .navigator-trigger { padding-left: 0; }
.navigator-trigger::after { width: 6px; height: 6px; margin-top: -3px; border-right: 1.5px solid currentColor; border-bottom: 1.5px solid currentColor; transform: rotate(45deg); content: ""; }
.navigator-trigger:hover, .navigator-trigger[aria-expanded="true"] { background: rgba(255, 255, 255, .06); }
.navigator-divider { color: var(--muted); }
.navigator-menu { position: absolute; top: calc(100% + 5px); left: 0; display: grid; gap: 2px; min-width: 170px; padding: 6px; border: 1px solid var(--line); border-radius: 13px; background: #11191d; box-shadow: 0 18px 45px rgba(0, 0, 0, .38); }
.navigator-menu[hidden] { display: none; }
.navigator-option { padding: 9px 10px; border-radius: 8px; color: var(--ink); font-size: .84rem; text-decoration: none; white-space: nowrap; }
.navigator-option:hover { background: rgba(255, 255, 255, .07); }
.navigator-option[aria-current="page"] { color: #071311; background: var(--cyan); }
.simulation-page { transform: translateX(0); opacity: 1; touch-action: pan-y; }
.simulation-page.is-animating { transition: transform .18s ease-out, opacity .14s ease-out; }
.simulation-page.is-leaving-left { transform: translateX(-32px); opacity: 0; transition: transform .18s ease-out, opacity .14s ease-out; }
.simulation-page.is-leaving-right { transform: translateX(32px); opacity: 0; transition: transform .18s ease-out, opacity .14s ease-out; }
.simulation-page.is-entering-left { transform: translateX(-32px); opacity: 0; }
.simulation-page.is-entering-right { transform: translateX(32px); opacity: 0; }
.simulation-dots { display: flex; align-items: center; justify-content: center; gap: 9px; min-height: 28px; margin-left: auto; }
.simulation-dot { width: 8px; height: 8px; border: 1px solid var(--line); border-radius: 50%; background: rgba(255, 255, 255, .16); transition: transform .18s ease, background .18s ease; }
.simulation-dot:hover { background: var(--muted); transform: scale(1.15); }
.simulation-dot[aria-current="page"] { border-color: var(--cyan); background: var(--cyan); transform: scale(1.25); }
.masthead, .stage-heading, .control > span, footer { display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.masthead { margin-bottom: 16px; }
.eyebrow { margin: 0 0 7px; color: var(--cyan); font-size: .72rem; font-weight: 700; letter-spacing: .16em; text-transform: uppercase; }
h1 { margin: 0; font-family: Georgia, "Times New Roman", serif; font-size: clamp(2.5rem, 5vw, 4rem); font-weight: 400; line-height: .9; letter-spacing: -.045em; }
.lede { margin: 8px 0 0; color: var(--muted); font-size: clamp(.95rem, 2vw, 1.12rem); }
.button { border: 1px solid var(--line); border-radius: 999px; padding: 10px 18px; cursor: pointer; color: var(--ink); background: transparent; transition: transform .15s, background .15s; }
.button:hover { transform: translateY(-1px); background: rgba(255,255,255,.06); }
.button:focus-visible, input:focus-visible, .navigator-trigger:focus-visible, .navigator-option:focus-visible, .simulation-dot:focus-visible { outline: 3px solid rgba(94,228,208,.35); outline-offset: 3px; }
.button-primary { color: #071311; border-color: var(--cyan); background: var(--cyan); min-width: 86px; }
.button-primary:hover { background: #7be9d8; }
.request-button { white-space: nowrap; }

.request-dialog { width: min(540px, calc(100% - 32px)); padding: 0; border: 1px solid var(--line); border-radius: 20px; color: var(--ink); background: var(--bg2); box-shadow: 0 30px 80px rgba(0,0,0,.5); }
.request-dialog::backdrop { background: rgba(3, 7, 9, .72); }
.request-form { display: grid; gap: 16px; padding: 24px; }
.request-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; }
.request-heading h2 { margin: 0; font-family: Georgia, "Times New Roman", serif; font-size: 1.8rem; font-weight: 400; }
.request-label { display: grid; gap: 8px; font-weight: 700; }
.request-label textarea { min-height: 126px; resize: vertical; padding: 12px; border: 1px solid var(--line); border-radius: 10px; color: var(--ink); background: rgba(255,255,255,.04); font: inherit; line-height: 1.4; }
.request-label textarea:focus-visible { outline: 3px solid rgba(94,228,208,.35); outline-offset: 3px; }
.request-note, .request-status { min-height: 1.4em; margin: 0; color: var(--muted); font-size: .82rem; line-height: 1.4; }

.workspace { display: grid; grid-template-columns: minmax(0, 1fr) 310px; width: 100%; min-width: 0; border: 1px solid var(--line); border-radius: 24px; overflow: hidden; background: rgba(4, 8, 10, .35); box-shadow: 0 30px 80px rgba(0,0,0,.24); }
.stage-panel { min-width: 0; padding: clamp(16px, 2vw, 24px); }
.controls-panel { padding: 24px 26px; border-left: 1px solid var(--line); background: var(--panel); }
.stage-heading { min-height: 52px; }
.stage-heading p { height: 4.2em; margin: 7px 0 0; color: var(--muted); font-size: .88rem; line-height: 1.4; }
.phase-label { color: var(--ink); font-family: Georgia, "Times New Roman", serif; font-size: 1.55rem; }
.canvas-wrap { position: relative; height: clamp(320px, 38vw, 430px); min-height: 320px; }
canvas { display: block; width: 100%; height: 100%; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

.transport { display: grid; grid-template-columns: auto minmax(100px, 1fr) auto; align-items: center; gap: 16px; padding: 13px 0; border-top: 1px solid var(--line); }
.transport-buttons { display: flex; gap: 8px; }
.transport .button { padding: 8px 14px; }
.scrubber { display: flex; min-width: 0; }
.scrubber input { width: 100%; margin: 0; }
.transport-time { display: flex; align-items: baseline; gap: 4px; min-width: 9.5ch; color: var(--muted); font-size: .78rem; font-variant-numeric: tabular-nums; justify-content: flex-end; }
.transport-time span:first-child { color: var(--ink); }

.readouts { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-top: 1px solid var(--line); }
.readout { display: grid; grid-template-columns: minmax(0, 1fr) auto; min-width: 0; align-items: baseline; gap: 2px 8px; padding: 17px 18px 0 0; overflow: hidden; }
.readout + .readout { padding-left: 18px; border-left: 1px solid var(--line); }
.readout span { grid-column: 1 / -1; color: var(--muted); font-size: .72rem; letter-spacing: .06em; text-transform: uppercase; }
.readout strong { font-family: Georgia, "Times New Roman", serif; font-size: clamp(1.5rem, 3vw, 2.15rem); font-weight: 400; font-variant-numeric: tabular-nums; }
.readout small { color: var(--muted); }

.controls-heading { min-height: 70px; border-bottom: 1px solid var(--line); }
.prediction { margin: 0 0 12px; color: var(--ink); font-family: Georgia, "Times New Roman", serif; font-size: 1.05rem; line-height: 1.3; }
.control { display: block; padding: 8px 0; border-bottom: 1px solid var(--line); }
.control strong { font-size: .85rem; font-weight: 600; }
.control output { color: var(--cyan); font-variant-numeric: tabular-nums; }
.control small { display: block; color: var(--muted); font-size: .72rem; }
input[type="range"] { width: 100%; margin: 8px 0 5px; accent-color: var(--cyan); cursor: pointer; }
.critical-marks { position: relative; height: 31px; margin: -5px 8px 1px; }
.critical-mark { position: absolute; top: 0; width: max-content; max-width: 42px; color: var(--muted); font-size: .58rem; line-height: 1.1; text-align: center; transform: translateX(-50%); pointer-events: none; }
.critical-mark::before { display: block; width: 1px; height: 7px; margin: 0 auto 2px; background: var(--amber); content: ""; }
.critical-mark strong { display: block; color: var(--amber); font-size: .62rem; font-weight: 600; }
.critical-mark span { display: block; white-space: nowrap; }
.critical-mark.is-offset strong, .critical-mark.is-offset span { transform: translateY(-8px); }
.critical-mark.is-left { text-align: left; transform: none; }
.critical-mark.is-left::before { margin-left: 0; }
.critical-mark.is-right { text-align: right; transform: translateX(-100%); }
.critical-mark.is-right::before { margin-right: 0; }
.model-note { display: flex; align-items: baseline; gap: 8px; margin-top: 9px; padding-left: 10px; border-left: 2px solid var(--amber); }
.model-note span { color: var(--amber); font-size: .72rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; }
.model-note p { margin: 0; color: var(--muted); font-size: .68rem; line-height: 1.3; }
footer { padding: 18px 4px 0; color: var(--muted); font-size: .74rem; }
footer p { margin: 0; }
.legend-dot { display: inline-block; width: 7px; height: 7px; margin: 0 6px 0 14px; border-radius: 50%; }
.legend-dot:first-child { margin-left: 0; }
.dot-path { background: var(--cyan); }
.dot-force { background: var(--coral); }

@media (max-width: 850px) {
  .workspace { grid-template-columns: 1fr; }
  .controls-panel { border-top: 1px solid var(--line); border-left: 0; }
  .controls-heading { min-height: 0; }
  .canvas-wrap { height: min(60vw, 420px); }
}

@media (max-width: 540px) {
  .app-shell { padding: 20px 12px; }
  .masthead { align-items: flex-end; }
  .lede { display: none; }
  .button { padding: 9px 13px; }
  .request-button { padding: 9px 12px; font-size: .78rem; }
  .stage-panel { padding: 16px 12px; }
  .canvas-wrap { height: 340px; }
  .stage-heading p { max-width: 230px; }
  .transport { grid-template-columns: 1fr auto; gap: 10px; }
  .transport-buttons { grid-column: 1 / -1; }
  .transport .button { flex: 1; }
  .readout { padding-right: 8px; }
  .readout + .readout { padding-left: 8px; }
  footer { display: block; }
  footer p + p { margin-top: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  .button, .simulation-page, .simulation-dot { transition: none; }
}