:root {
  --bg: #f4f5f3;
  --surface: #ffffff;
  --surface-2: #f7f8f6;
  --line: #d9dedb;
  --line-strong: #b8c2bd;
  --ink: #17201c;
  --muted: #67716c;
  --mint: #176f86;
  --mint-2: #176f86;
  --amber: #9a5a12;
  --red: #a23a34;
  --shadow: none;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  color: var(--ink);
  background: var(--bg);
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.5;
}

button, input { font: inherit; }

button, label, input[type="range"] { -webkit-tap-highlight-color: transparent; }

button:focus-visible, input:focus-visible, a:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  z-index: 20;
  top: 8px;
  left: 8px;
  transform: translateY(-160%);
  padding: 9px 13px;
  color: #06110e;
  background: var(--mint);
  border-radius: 8px;
}

.skip-link:focus { transform: none; }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 62px;
  padding: 12px clamp(20px, 4vw, 64px);
  border-bottom: 1px solid var(--line);
  background: #fff;
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand {
  display: inline-flex;
  gap: 12px;
  align-items: center;
  color: inherit;
  text-decoration: none;
}

.brand strong { display: block; letter-spacing: 0.06em; }
.brand strong { font-size: 0.85rem; }

.backend-chip {
  display: flex;
  align-items: center;
  gap: 9px;
  color: var(--muted);
  font-size: 0.75rem;
  letter-spacing: 0.02em;
}

.status-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--red); }
.status-dot.pending { color: var(--amber); background: currentColor; }
.status-dot.online { color: var(--mint); background: currentColor; }
.status-dot.offline { color: var(--red); background: currentColor; }

.shell { width: min(1380px, calc(100% - 40px)); margin: 0 auto; padding: 32px 0 64px; }

.hero {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 2px 28px;
}

.hero h1 {
  margin: 0;
  font-size: clamp(1.7rem, 3vw, 2.6rem);
  line-height: 1.15;
  letter-spacing: -0.035em;
  font-weight: 650;
}

.mode-switch { display: inline-flex; padding: 3px; border: 1px solid var(--line); border-radius: 7px; background: #fff; }
.mode-switch button { padding: 7px 11px; border: 0; border-radius: 5px; color: var(--muted); background: transparent; cursor: pointer; font-size: 0.7rem; }
.mode-switch button.active { color: #fff; background: var(--mint); }

.view-switch { display: inline-flex; margin-bottom: 24px; padding: 3px; border: 1px solid var(--line); border-radius: 8px; background: #fff; }
.view-switch button { padding: 8px 16px; border: 0; border-radius: 6px; color: var(--muted); background: transparent; cursor: pointer; font-size: 0.76rem; letter-spacing: 0.03em; }
.view-switch button.active { color: #fff; background: var(--mint); }

.demo-panel .hint { margin: 6px 0 0; }
.demo-frame { margin-top: 20px; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; background: #000; }
.demo-frame video { display: block; width: 100%; height: auto; }
.demo-caption { margin: 16px 0 0; max-width: 70ch; color: var(--muted); font-size: 0.9rem; }

.vla-condition-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 9px; }
.condition-card { position: relative; display: block; cursor: pointer; }
.condition-card > input { position: absolute; opacity: 0; pointer-events: none; }
.condition-card > span { display: block; min-height: 68px; padding: 12px 14px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface-2); transition: border-color 160ms, background 160ms; }
.condition-card strong, .condition-card small { display: block; }
.condition-card strong { font-size: 0.75rem; }
.condition-card small { margin-top: 3px; color: var(--muted); font-size: 0.63rem; }
.condition-card > input:checked + span { border-color: var(--mint); background: #edf6f8; }
.condition-card > input:focus-visible + span { outline: 2px solid var(--mint); outline-offset: 2px; }
.condition-card > input:disabled + span { opacity: 0.48; cursor: not-allowed; }
.vla-parameter-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px 28px; margin-top: 18px; }
.vla-fault-model-heading { margin-top: 20px; }
.vla-fault-model-heading h3 { margin: 0 0 4px; font-size: 0.8rem; }
.vla-joint-controls { margin: 18px 0 0; padding: 0; border: 0; }
.vla-joint-controls legend { margin-bottom: 8px; color: var(--muted); font-size: 0.66rem; }
.joint-choice-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 7px; }
.joint-choice-grid label { position: relative; cursor: pointer; }
.joint-choice-grid input { position: absolute; opacity: 0; }
.joint-choice-grid span { display: block; padding: 8px 4px; border: 1px solid var(--line); border-radius: 6px; background: var(--surface-2); text-align: center; font-size: 0.68rem; }
.joint-choice-grid input:checked + span { border-color: var(--mint); background: #edf6f8; }
.joint-choice-grid input:focus-visible + span { outline: 2px solid var(--mint); outline-offset: 2px; }
.vla-limit-note { margin-top: 12px; }

.workspace { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(340px, 0.65fr); gap: 20px; align-items: start; }
.control-column, .results-column { display: grid; gap: 20px; }
.results-column { position: sticky; top: 92px; }

.panel {
  padding: clamp(20px, 2.4vw, 32px);
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--surface);
  overflow: hidden;
}

.panel-heading, .monitor-header { display: flex; justify-content: space-between; gap: 20px; align-items: start; }
.panel h2 { margin: 0; font-size: 1.25rem; letter-spacing: -0.025em; }
.hint { margin: 12px 0 22px; color: var(--muted); font-size: 0.76rem; }

.text-button {
  padding: 5px;
  border: 0;
  color: var(--muted);
  background: none;
  cursor: pointer;
  font-size: 0.72rem;
}
.text-button:hover { color: var(--mint); }

.fault-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.loading-copy, .muted { color: var(--muted); font-size: 0.78rem; }

.fault-card { position: relative; }
.fault-card > input { position: absolute; opacity: 0; pointer-events: none; }
.fault-card-body {
  min-height: 112px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
  cursor: pointer;
  transition: border-color 160ms, background 160ms, transform 160ms;
}
.fault-card-body:hover { border-color: var(--line-strong); }
.fault-card > input:checked + .fault-card-body { border-color: var(--mint); background: #edf6f8; }
.fault-card > input:focus-visible + .fault-card-body { outline: 2px solid var(--mint); outline-offset: 2px; }
.fault-title { display: flex; align-items: center; gap: 9px; }
.fault-code { display: grid; place-items: center; width: 24px; height: 24px; border: 1px solid var(--line-strong); border-radius: 6px; color: var(--mint); font-family: Arial, Helvetica, sans-serif; font-size: 0.74rem; }
.fault-title strong { font-size: 0.76rem; line-height: 1.2; }
.fault-severity { display: none; margin-top: 15px; }
.fault-card > input:checked + .fault-card-body .fault-severity { display: block; }
.fault-severity label { display: flex; justify-content: space-between; color: var(--muted); font-size: 0.62rem; }
.fault-severity output { color: var(--ink); font-family: Arial, Helvetica, sans-serif; }
.fault-range-bounds { display: flex; justify-content: space-between; color: var(--muted); font: 0.54rem Arial, Helvetica, sans-serif; }

input[type="range"] {
  width: 100%;
  height: 4px;
  margin: 10px 0 4px;
  border-radius: 4px;
  appearance: none;
  background: linear-gradient(90deg, var(--mint-2) var(--range-progress, 25%), #dfe4e1 var(--range-progress, 25%));
  cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb { appearance: none; width: 15px; height: 15px; border: 2px solid #fff; border-radius: 50%; background: var(--mint); box-shadow: 0 0 0 1px var(--mint); }
input[type="range"]::-moz-range-thumb { width: 10px; height: 10px; border: 2px solid #fff; border-radius: 50%; background: var(--mint); }

.inline-warning { margin: 14px 0 0; padding: 10px 12px; color: #ffd3a4; background: rgba(205, 111, 26, 0.13); border: 1px solid rgba(255, 182, 99, 0.23); border-radius: 8px; font-size: 0.72rem; }

.slider-list { margin-top: 20px; display: grid; grid-template-columns: 1fr 1fr; gap: 25px 36px; }
.slider-label { display: flex; justify-content: space-between; gap: 12px; color: var(--muted); font-size: 0.72rem; }
.slider-label output { color: var(--ink); font-family: Arial, Helvetica, sans-serif; font-size: 0.7rem; }
.range-ends { display: flex; justify-content: space-between; color: var(--muted); font-size: 0.55rem; }

.experiment-list { display: grid; gap: 8px; margin-top: 20px; }
.check-card { display: flex; gap: 10px; align-items: center; padding: 10px 12px; border: 1px solid var(--line); border-radius: 5px; background: #fff; cursor: pointer; }
.check-card:hover { border-color: var(--line-strong); }
.check-card input { width: 17px; height: 17px; accent-color: var(--mint-2); }
.check-card strong { font-size: 0.77rem; }

.recommendation { display: flex; align-items: center; gap: 12px; margin-top: 14px; padding: 12px 14px; border-left: 2px solid var(--mint); background: #f1f6f7; }
.recommendation > span { color: var(--mint); font-size: 1.2rem; }
.recommendation p { margin: 0; color: var(--muted); font-size: 0.69rem; }
.recommendation strong { color: var(--ink); }

.seed-field { display: flex; gap: 8px; align-items: center; color: var(--muted); font-size: 0.6rem; letter-spacing: 0.12em; }
.seed-field input { width: 82px; padding: 7px 8px; border: 1px solid var(--line); border-radius: 5px; color: var(--ink); background: #fff; font-family: Arial, Helvetica, sans-serif; }
.option-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin: 20px 0; }
.switch-row { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 12px; min-height: 62px; padding: 11px 13px; border: 1px solid var(--line); border-radius: 7px; background: #fff; cursor: pointer; }
.switch-row span { min-width: 0; }
.switch-row strong, .switch-row small { display: block; }
.switch-row strong { font-size: 0.71rem; }
.switch-row small { color: var(--muted); font-size: 0.59rem; }
.switch-row input { position: absolute; opacity: 0; }
.switch-row i { position: relative; width: 31px; height: 17px; border-radius: 12px; background: #31423e; transition: background 160ms; }
.switch-row i::after { content: ""; position: absolute; top: 3px; left: 3px; width: 11px; height: 11px; border-radius: 50%; background: #a5b6b0; transition: transform 160ms; }
.switch-row input:checked + i { background: var(--mint-2); }
.switch-row input:checked + i::after { transform: translateX(14px); background: #fff; }
.switch-row:has(input:disabled) { cursor: not-allowed; opacity: 0.5; }
.switch-row:has(input:focus-visible) { outline: 2px solid var(--mint); outline-offset: 2px; }

.run-button { display: flex; justify-content: space-between; align-items: center; width: 100%; padding: 15px 18px; border: 0; border-radius: 7px; color: #fff; background: var(--mint); font-weight: 700; cursor: pointer; }
.run-button:hover:not(:disabled) { background: #115c70; }
.run-button:disabled { cursor: not-allowed; color: #7c8580; background: #dfe4e1; }
.run-button b { font-size: 1.1rem; }
.run-note { margin: 9px 0 0; color: var(--muted); text-align: center; font-size: 0.62rem; }

.run-state { padding: 5px 8px; border: 1px solid var(--line); border-radius: 6px; color: var(--muted); font: 0.58rem Arial, Helvetica, sans-serif; letter-spacing: 0.1em; }
.run-state.running { color: var(--mint); border-color: rgba(23, 111, 134, 0.35); }
.run-state.completed { color: var(--mint); }
.run-state.failed { color: var(--red); border-color: rgba(255, 125, 116, 0.35); }
.monitor-stage { display: flex; align-items: center; gap: 10px; min-height: 92px; }
.monitor-stage > p { margin: 0; color: var(--muted); font-size: 0.72rem; }
.monitor-indicator { width: 9px; height: 9px; border-radius: 50%; background: var(--line-strong); }
.monitor-panel.is-running .monitor-indicator { background: var(--mint); }
.progress-meta { display: flex; justify-content: space-between; color: var(--muted); font-size: 0.64rem; }
.progress-meta strong { color: var(--ink); font-family: Arial, Helvetica, sans-serif; }
.progress-track { height: 5px; margin-top: 7px; overflow: hidden; border-radius: 6px; background: rgba(180, 210, 202, 0.12); }
.progress-track span { display: block; width: 0%; height: 100%; background: var(--mint); transition: width 250ms ease; }

.empty-state { display: flex; align-items: center; gap: 16px; min-height: 110px; color: var(--muted); }
.empty-state > span { display: grid; place-items: center; width: 48px; height: 48px; border: 1px solid var(--line); border-radius: 50%; color: var(--mint); font-size: 1.25rem; }
.empty-state p { font-size: 0.74rem; }
.empty-state small { font-size: 0.62rem; }
.diagnosis-hero { display: flex; align-items: center; gap: 14px; margin-top: 20px; padding: 15px; border: 1px solid var(--line); border-radius: 7px; background: #f1f6f7; }
.diagnosis-code { display: grid; place-items: center; width: 52px; height: 52px; border-radius: 6px; color: #fff; background: var(--mint); font: 1.55rem Arial, Helvetica, sans-serif; }
.diagnosis-hero small, .diagnosis-hero strong, .diagnosis-hero div > span { display: block; }
.diagnosis-hero small { color: var(--muted); font-size: 0.52rem; letter-spacing: 0.13em; }
.diagnosis-hero strong { margin: 2px 0; font-size: 0.8rem; }
.diagnosis-hero div > span { color: var(--muted); font-size: 0.62rem; }
.metric-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; margin: 16px 0; overflow: hidden; border: 1px solid var(--line); border-radius: 10px; background: var(--line); }
.metric-grid div { padding: 12px; background: #fff; }
.metric-grid dt { color: var(--muted); font-size: 0.56rem; text-transform: uppercase; letter-spacing: 0.1em; }
.metric-grid dd { margin: 4px 0 0; font: 0.85rem Arial, Helvetica, sans-serif; }
.result-block { padding: 13px 0; border-top: 1px solid var(--line); }
.result-block h3 { margin: 0 0 5px; font-size: 0.68rem; }
.result-block p { margin: 0; color: var(--muted); font-size: 0.68rem; }

.artifact-list { display: grid; gap: 8px; margin-top: 18px; }
.artifact-link { display: flex; justify-content: space-between; align-items: center; padding: 11px 12px; border: 1px solid var(--line); border-radius: 9px; color: var(--ink); text-decoration: none; font-size: 0.68rem; }
.artifact-link:hover { border-color: var(--mint); }
.artifact-link span { color: var(--mint); }
.video-shell { margin-top: 14px; }
.video-shell video { width: 100%; border-radius: 6px; background: #111; }

.toast { position: fixed; z-index: 30; right: 24px; bottom: 24px; width: min(390px, calc(100% - 48px)); padding: 13px 15px; border: 1px solid rgba(255, 125, 116, 0.35); border-radius: 10px; color: #ffe8e5; background: rgba(73, 25, 24, 0.97); box-shadow: var(--shadow); font-size: 0.75rem; }
.hidden { display: none !important; }

noscript { display: block; padding: 20px; color: #fff; background: #712b27; text-align: center; }

@media (max-width: 1040px) {
  .workspace { grid-template-columns: 1fr; }
  .results-column { position: static; grid-template-columns: 1fr 1fr; }
  .monitor-panel { grid-column: 1 / -1; }
}

@media (max-width: 760px) {
  .shell { width: min(100% - 24px, 680px); padding-top: 34px; }
  .hero { display: block; padding-bottom: 34px; }
  .mode-switch { margin-top: 16px; flex-wrap: wrap; }
  .backend-chip span:last-child { display: none; }
  .fault-grid { grid-template-columns: 1fr 1fr; }
  .slider-list, .option-grid, .results-column, .vla-condition-grid, .vla-parameter-grid { grid-template-columns: 1fr; }
  .monitor-panel { grid-column: auto; }
}

@media (max-width: 430px) {
  .topbar { min-height: 62px; padding-inline: 14px; }
  .brand strong { font-size: 0.76rem; }
  .panel { padding: 18px; border-radius: 14px; }
  .fault-grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation: none !important; transition: none !important; }
}