:root {
  --bg: #0a0e0f;
  --panel: #111718;
  --panel-2: #161e1f;
  --line: #2c383a;
  --text: #f2f5f5;
  --muted: #adb9ba;
  --green: #63d69a;
  --amber: #f3b85b;
  --red: #ff7d73;
  --blue: #78b9ff;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  color: var(--text);
  background: radial-gradient(circle at 12% 8%, rgba(99,214,154,.08), transparent 25rem), var(--bg);
  font: 16px/1.7 Inter, "PingFang SC", "Microsoft YaHei", sans-serif;
}
button, input { font: inherit; }
button { min-height: 42px; }

.site-header { display: flex; justify-content: space-between; align-items: center; gap: 24px; padding: 18px clamp(20px,4vw,64px); border-bottom: 1px solid var(--line); }
.site-header a { color: var(--text); text-decoration: none; font-size: 14px; }
.site-header nav { display: flex; gap: 22px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 12px; letter-spacing: .08em; }
.brand-mark { display: grid; place-items: center; width: 34px; height: 34px; color: #07110c; background: var(--green); font-weight: 900; }

main { width: min(1500px, calc(100% - 32px)); margin: 0 auto 80px; }
.hero { padding: clamp(56px,8vw,112px) clamp(4px,3vw,42px) 52px; }
.eyebrow, .panel-label, .phase { margin: 0; color: var(--green); font-size: 13px; font-weight: 800; letter-spacing: .16em; }
.hero h1 { margin: 14px 0 18px; max-width: 1050px; font-size: clamp(43px,7vw,92px); line-height: .98; letter-spacing: -.055em; }
.hero h1 em { color: var(--green); font-style: normal; }
.hero > p:last-child { max-width: 780px; margin: 0; color: var(--muted); font-size: clamp(17px,2vw,21px); }

.lab { border: 1px solid var(--line); background: var(--panel); box-shadow: 0 28px 70px rgba(0,0,0,.3); }
.toolbar { display: flex; align-items: center; gap: 18px; padding: 16px; border-bottom: 1px solid var(--line); flex-wrap: wrap; }
.scenario-tabs, .fault-controls { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.scenario-tab, #apply-faults, #query-button, .control-buttons button {
  color: var(--text); background: #172021; border: 1px solid #354345; padding: 8px 14px; cursor: pointer;
}
.scenario-tab:hover, .scenario-tab:focus-visible, #apply-faults:hover, #query-button:hover, .control-buttons button:hover { border-color: var(--green); }
.scenario-tab.is-active { color: #07110c; background: var(--green); border-color: var(--green); font-weight: 800; }
.fault-controls { margin-left: auto; }
.fault-controls label { display: flex; align-items: center; gap: 6px; color: var(--muted); font-size: 13px; }
.fault-controls input { width: 18px; height: 18px; accent-color: var(--red); }
.step-readout { display: flex; flex-direction: column; min-width: 72px; color: var(--muted); font-size: 12px; }
.step-readout strong { color: var(--text); font-size: 17px; }

.pipeline { display: flex; align-items: stretch; gap: 6px; padding: 14px 16px; overflow-x: auto; border-bottom: 1px solid var(--line); background: #0d1213; }
.pipeline button { min-width: 132px; padding: 9px 12px; color: var(--muted); background: #131a1b; border: 1px solid var(--line); text-align: left; cursor: pointer; }
.pipeline button span { display: block; color: #778486; font-size: 12px; }
.pipeline button.is-active { color: #07110c; background: var(--green); border-color: var(--green); font-weight: 800; }
.pipeline button.is-pass { color: var(--green); border-color: #3d775c; }
.pipeline button.is-fail { color: var(--red); border-color: #8c4644; background: #211414; }
.pipeline button.is-blocked { opacity: .38; text-decoration: line-through; }
.pipeline > i { align-self: center; color: #63706f; font-size: 18px; font-style: normal; }

.lab-grid { display: grid; grid-template-columns: minmax(0,1.3fr) minmax(280px,.72fr) minmax(310px,.85fr); }
.data-panel, .explain-panel, .inspect-panel { min-width: 0; padding: 22px; }
.data-panel, .explain-panel { border-right: 1px solid var(--line); }
.panel-head { display: flex; justify-content: space-between; gap: 18px; align-items: end; margin-bottom: 15px; }
.panel-head h2, .explain-panel h2 { margin: 4px 0 0; font-size: 22px; }
.panel-head > p { margin: 0; color: var(--muted); font-size: 13px; text-align: right; }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); }
table { width: 100%; min-width: 580px; border-collapse: collapse; font: 13px/1.5 "Cascadia Code", Consolas, monospace; }
th, td { padding: 10px 12px; border-bottom: 1px solid var(--line); text-align: left; }
th { color: var(--muted); background: #0d1213; font-size: 12px; letter-spacing: .08em; }
tbody tr:last-child td { border-bottom: 0; }
tbody tr.is-current { background: rgba(120,185,255,.08); }
tbody tr.has-error { background: rgba(255,125,115,.08); }
.row-status { color: var(--muted); }
.row-status.pass { color: var(--green); }
.row-status.fail { color: var(--red); }
.schema-strip { display: flex; gap: 8px; margin: 12px 0; flex-wrap: wrap; }
.schema-strip span { padding: 5px 8px; color: var(--muted); border: 1px solid var(--line); background: #0e1415; font-size: 12px; }
.artifact-panel { border: 1px solid var(--line); background: #090d0e; }
.artifact-head, .error-head, .code-head { display: flex; justify-content: space-between; gap: 12px; padding: 10px 12px; border-bottom: 1px solid var(--line); color: var(--muted); font-size: 12px; letter-spacing: .1em; }
.artifact-head strong { color: var(--amber); }
#artifact-view { min-height: 142px; margin: 0; padding: 14px; overflow-x: auto; color: #c3cfcd; font: 13px/1.65 "Cascadia Code", Consolas, monospace; white-space: pre; }

.explain-panel > p:not(.panel-label):not(.phase) { color: var(--muted); }
.change-box, .why-box, .query-card { margin-top: 18px; padding: 15px; border: 1px solid var(--line); background: var(--panel-2); }
.change-box > span, .why-box > span, .query-card > span { color: var(--amber); font-size: 12px; font-weight: 800; letter-spacing: .12em; }
.why-box > span { color: var(--green); }
.change-box p, .why-box p, .query-card p { margin: 7px 0 0; font-size: 14px; }
.query-card label { display: block; margin: 10px 0; color: var(--muted); font-size: 13px; }
.query-card input, .progress input { width: 76px; min-height: 38px; margin-left: 6px; padding: 4px 7px; color: var(--text); background: #0c1112; border: 1px solid #3b494b; }

.counter-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 9px; }
.counter-grid > div { padding: 12px; border: 1px solid var(--line); background: #0e1415; }
.counter-grid span, .counter-grid small { display: block; color: var(--muted); font-size: 12px; }
.counter-grid strong { display: block; margin: 4px 0; color: var(--text); font-size: 23px; }
.error-panel { margin: 14px 0; border: 1px solid var(--line); background: #0b1011; }
.error-head strong { color: var(--green); }
.error-head strong.failed { color: var(--red); }
#error-list { min-height: 92px; max-height: 190px; margin: 0; padding: 10px 12px 10px 36px; overflow-y: auto; font-size: 12px; }
#error-list li { padding: 4px 0; color: var(--red); }
#error-list li.no-error { color: var(--green); }
.code-panel { border: 1px solid var(--line); background: #090d0e; }
.code-head strong { color: var(--green); }
#code-lines { margin: 0; padding: 12px 12px 12px 46px; overflow-x: auto; font: 13px/1.65 "Cascadia Code", Consolas, monospace; white-space: pre; }
#code-lines li { padding-left: 8px; color: #b8c6c4; }
#code-lines li.is-active { color: #fff; background: rgba(99,214,154,.12); }

.controls { display: flex; justify-content: space-between; gap: 18px; padding: 16px; border-top: 1px solid var(--line); flex-wrap: wrap; }
.progress { display: flex; align-items: center; gap: 15px; flex-wrap: wrap; }
.progress label { color: var(--muted); font-size: 13px; }
.step-dots { display: flex; gap: 6px; }
.step-dots button { width: 12px; height: 12px; min-height: 12px; padding: 0; border: 1px solid #5c6c6d; border-radius: 50%; background: transparent; cursor: pointer; }
.step-dots button.is-active { background: var(--green); border-color: var(--green); }
#speed-message, .keyboard-hint { color: var(--muted); font-size: 12px; }
.control-buttons { display: flex; gap: 8px; flex-wrap: wrap; }
.control-buttons .primary-button { color: #06100b; background: var(--green); border-color: var(--green); font-weight: 800; }
.keyboard-hint { margin: 0; padding: 0 16px 16px; }

.concept-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 1px; margin-top: 32px; background: var(--line); border: 1px solid var(--line); }
.concept-grid article { padding: 24px; background: var(--panel); }
.concept-grid span { color: var(--green); font-size: 12px; }
.concept-grid h2 { margin: 7px 0; font-size: 19px; }
.concept-grid p { margin: 0; color: var(--muted); font-size: 14px; }

@media (max-width: 1120px) {
  .lab-grid { grid-template-columns: 1fr 1fr; }
  .data-panel { grid-column: 1 / -1; border-right: 0; border-bottom: 1px solid var(--line); }
}
@media (max-width: 720px) {
  main { width: min(100% - 20px,1500px); }
  .site-header, .panel-head { align-items: flex-start; }
  .site-header { flex-direction: column; }
  .hero h1 { font-size: 45px; }
  .fault-controls { margin-left: 0; }
  .lab-grid { display: block; }
  .data-panel, .explain-panel { border-right: 0; border-bottom: 1px solid var(--line); }
  .concept-grid { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; transition: none !important; }
}