:root {
  --bg: #090d0d;
  --panel: #111716;
  --panel-2: #0c1111;
  --line: #2a3432;
  --line-strong: #46524f;
  --text: #f4f7f3;
  --muted: #a5b0ac;
  --dim: #74807c;
  --amber: #f3b85b;
  --cyan: #64d8cf;
  --green: #9cdd75;
  --red: #ff786e;
  --mono: "Cascadia Code", Consolas, monospace;
  --sans: "Microsoft YaHei UI", "PingFang SC", sans-serif;
}

* { box-sizing: border-box; }
body { margin: 0; color: var(--text); background: var(--bg); font: 17px/1.7 var(--sans); }
button, input { font: inherit; }
a { color: inherit; }

.site-header {
  min-height: 68px; padding: 0 clamp(20px, 5vw, 72px); display: flex; align-items: center;
  justify-content: space-between; gap: 24px; border-bottom: 1px solid var(--line); background: rgba(9,13,13,.95);
}
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; font: 700 13px var(--mono); letter-spacing: .1em; }
.brand-mark { width: 30px; height: 30px; display: grid; place-items: center; color: var(--bg); background: var(--amber); }
nav { display: flex; gap: 24px; }
nav a { color: var(--muted); text-decoration: none; font-size: 15px; }
nav a:hover { color: var(--text); }
main { width: min(1600px, 100%); margin: auto; }

.hero {
  min-height: 430px; padding: clamp(70px, 9vw, 135px) clamp(22px, 6vw, 96px) 70px;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(circle at 78% 38%, rgba(100,216,207,.1), transparent 26%),
    linear-gradient(120deg, transparent 67%, rgba(243,184,91,.04) 67% 68%, transparent 68%);
}
.eyebrow, .panel-label { margin: 0; color: var(--amber); font: 700 12px var(--mono); letter-spacing: .14em; }
.hero h1 { margin: 18px 0 24px; font-size: clamp(52px, 7vw, 104px); line-height: .98; letter-spacing: -.06em; }
.hero h1 em { color: var(--cyan); font-style: normal; }
.hero > p:last-child { max-width: 780px; margin: 0; color: var(--muted); font-size: clamp(18px, 2vw, 23px); }

.lab { margin: 54px clamp(14px, 3vw, 48px); border: 1px solid var(--line-strong); background: var(--panel); }
.toolbar { display: grid; grid-template-columns: auto 1fr auto; border-bottom: 1px solid var(--line); }
.shape-tabs, .scenario-tabs { display: flex; }
.shape-tab, .scenario-tab {
  min-height: 68px; padding: 13px 20px; color: var(--muted); border: 0; border-right: 1px solid var(--line);
  background: transparent; cursor: pointer;
}
.shape-tab:hover, .scenario-tab:hover { color: var(--text); background: #171e1d; }
.shape-tab.is-active { color: var(--cyan); box-shadow: inset 0 -3px var(--cyan); }
.scenario-tabs { justify-content: flex-end; }
.scenario-tab.is-active { color: var(--amber); box-shadow: inset 0 -3px var(--amber); }
.step-readout { min-width: 130px; padding: 12px 20px; display: grid; place-content: center; border-left: 1px solid var(--line); text-align: right; }
.step-readout span { color: var(--dim); font: 700 12px var(--mono); }
.step-readout strong { font: 700 18px var(--mono); }

.lab-grid { display: grid; grid-template-columns: minmax(480px, 1.45fr) minmax(280px, .75fr) minmax(340px, .95fr); }
.stage-panel, .explain-panel, .inspect-panel { min-width: 0; padding: clamp(20px, 2.5vw, 34px); }
.stage-panel, .explain-panel { border-right: 1px solid var(--line); }
.panel-head { display: flex; align-items: start; justify-content: space-between; gap: 20px; }
.panel-head h2 { margin: 5px 0 0; font-size: 23px; }
.panel-head > p { max-width: 245px; margin: 0; color: var(--amber); font: 12px/1.5 var(--mono); text-align: right; }
#world-stage { display: block; width: 100%; margin-top: 22px; border: 1px solid var(--line); background: #0b1010; touch-action: none; }
.drag-handle { cursor: grab; }
.drag-handle:active { cursor: grabbing; }
.caster-body { fill: var(--amber); stroke: #2a2114; stroke-width: 3; }
.caster-forward { stroke: var(--amber); stroke-width: 4; }
.target-body { fill: #24302e; stroke: var(--muted); stroke-width: 3; transition: fill .2s, stroke .2s; }
.target-group.is-candidate .target-body { fill: rgba(243,184,91,.23); stroke: var(--amber); }
.target-group.is-hit .target-body { fill: rgba(156,221,117,.28); stroke: var(--green); }
.target-group.is-rejected .target-body { fill: rgba(255,120,110,.2); stroke: var(--red); }
.target-group.is-selected .target-body { stroke-width: 6; }
.target-label { fill: var(--text); font: 700 17px var(--mono); pointer-events: none; text-anchor: middle; dominant-baseline: central; }
.exact-shape { fill: rgba(100,216,207,.08); stroke: var(--cyan); stroke-width: 3; }
.broad-shape { fill: none; stroke: var(--amber); stroke-width: 2; stroke-dasharray: 10 9; opacity: .8; }
.legend { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 15px; color: var(--muted); font-size: 13px; }
.legend i { display: inline-block; width: 9px; height: 9px; margin-right: 7px; border-radius: 50%; }
.caster-dot { background: var(--amber); }.candidate-dot { background: var(--amber); }
.hit-dot { background: var(--green); }.reject-dot { background: var(--red); }

.explain-panel { display: flex; flex-direction: column; gap: 18px; }
.phase { margin: 12px 0 -10px; color: var(--cyan); font: 700 12px var(--mono); letter-spacing: .1em; }
.explain-panel h2 { margin: 0; font-size: 29px; line-height: 1.2; }
.explain-panel > p:not(.panel-label):not(.phase) { color: var(--muted); }
.change-box, .why-box { padding: 15px 17px; border: 1px solid var(--line); background: var(--panel-2); }
.change-box { border-left: 3px solid var(--cyan); }.why-box { border-left: 3px solid var(--amber); }
.change-box span, .why-box span, .reason-card > span { color: var(--dim); font: 700 12px var(--mono); letter-spacing: .1em; }
.change-box p, .why-box p { margin: 6px 0 0; color: var(--muted); }
.reason-card { margin-top: auto; padding: 18px; border: 1px solid var(--line-strong); background: #0a0f0f; }
.reason-card strong { display: block; margin: 8px 0 13px; font-size: 21px; }
.reason-card dl { margin: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: var(--line); }
.reason-card dl div { padding: 10px; background: var(--panel-2); }
.reason-card dt { color: var(--dim); font-size: 12px; }.reason-card dd { margin: 3px 0 0; font: 700 13px var(--mono); }
#target-reason { margin: 14px 0 0; color: var(--amber); font-weight: 700; }

.inspect-panel { display: flex; flex-direction: column; gap: 20px; }
.counter-grid { display: grid; grid-template-columns: repeat(3, 1fr); border: 1px solid var(--line); }
.counter-grid div { padding: 12px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.counter-grid div:nth-child(3n) { border-right: 0; }
.counter-grid span { color: var(--dim); font: 700 12px var(--mono); }
.counter-grid strong { display: block; color: var(--cyan); font: 700 23px var(--mono); }
.counter-grid small { color: var(--muted); font-size: 12px; }
.counter-grid .final-count { grid-column: span 2; border-bottom: 0; }
.counter-grid .final-count strong { color: var(--green); }
.target-list { border: 1px solid var(--line); }
.list-head { padding: 10px 12px; display: flex; justify-content: space-between; color: var(--dim); font: 700 12px var(--mono); }
.target-list ol { margin: 0; padding: 0; list-style: none; }
.target-list button { width: 100%; padding: 10px 12px; display: grid; grid-template-columns: 28px 1fr auto; gap: 8px; color: var(--muted); border: 0; border-top: 1px solid var(--line); background: var(--panel-2); text-align: left; cursor: pointer; }
.target-list button:hover, .target-list button.is-selected { color: var(--text); background: #17201f; }
.target-list button b { color: var(--text); }.target-list button em { color: var(--dim); font-style: normal; font-size: 12px; }
.target-list button[data-result="hit"] em { color: var(--green); }
.target-list button[data-result="rejected"] em { color: var(--red); }
.code-panel { margin-top: auto; }
.code-head { padding: 9px 12px; display: flex; justify-content: space-between; border: 1px solid var(--line); border-bottom: 0; color: var(--dim); font: 700 12px var(--mono); }
.code-head strong { color: var(--amber); }
#code-lines { margin: 0; padding: 14px 0 14px 44px; overflow-x: auto; border: 1px solid var(--line); background: #080c0c; font: 12px/1.7 var(--mono); }
#code-lines li { padding: 0 10px; color: #939e9a; white-space: pre; }
#code-lines li.is-active { color: var(--text); background: rgba(243,184,91,.12); box-shadow: inset 3px 0 var(--amber); }

.controls { padding: 17px 22px; display: flex; align-items: center; justify-content: space-between; gap: 20px; border-top: 1px solid var(--line); }
.progress { display: flex; align-items: center; flex-wrap: wrap; gap: 12px; color: var(--muted); font-size: 13px; }
.step-dots { display: flex; gap: 7px; }
.step-dots button { width: 9px; height: 9px; padding: 0; border: 0; border-radius: 50%; background: #46514e; }
.step-dots button.is-past { background: var(--cyan); }.step-dots button.is-active { background: var(--amber); box-shadow: 0 0 0 4px rgba(243,184,91,.14); }
.progress input { width: 60px; padding: 3px 6px; color: var(--text); border: 1px solid var(--line-strong); background: var(--panel-2); font-family: var(--mono); }
#speed-message { color: var(--dim); }
.control-buttons { display: flex; flex-wrap: wrap; gap: 8px; }
.control-buttons button { min-height: 43px; padding: 8px 14px; color: var(--text); border: 1px solid var(--line-strong); background: #111817; cursor: pointer; }
.control-buttons button:disabled { color: #59635f; cursor: not-allowed; }
.control-buttons button:hover:not(:disabled) { border-color: var(--amber); }
.control-buttons button.is-playing { color: var(--cyan); border-color: var(--cyan); }
.control-buttons .primary { color: var(--bg); background: var(--amber); border-color: var(--amber); font-weight: 800; }

.notes { padding: 36px clamp(20px, 5vw, 72px) 100px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.notes article { padding: 22px; border-top: 2px solid var(--line-strong); }
.notes span { color: var(--amber); font: 700 12px var(--mono); }
.notes h3 { margin: 13px 0 7px; }.notes p { margin: 0; color: var(--muted); }

@media (max-width: 1200px) {
  .lab-grid { grid-template-columns: 1.4fr 1fr; }
  .inspect-panel { grid-column: 1 / -1; border-top: 1px solid var(--line); }
  .notes { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 820px) {
  body { font-size: 16px; }
  .site-header { align-items: flex-start; padding-block: 15px; }
  nav { gap: 12px; flex-wrap: wrap; justify-content: flex-end; }
  nav a { font-size: 13px; }
  .toolbar { grid-template-columns: 1fr; }
  .shape-tabs, .scenario-tabs { display: grid; grid-template-columns: repeat(3, 1fr); }
  .step-readout { border-top: 1px solid var(--line); border-left: 0; text-align: left; }
  .lab-grid { grid-template-columns: 1fr; }
  .stage-panel, .explain-panel { border-right: 0; border-bottom: 1px solid var(--line); }
  .controls { align-items: stretch; flex-direction: column; }
  .control-buttons button { flex: 1 1 120px; }
  .notes { grid-template-columns: 1fr; }
}
@media (max-width: 520px) {
  .brand span:last-child { display: none; }
  .hero { padding-inline: 18px; }
  .lab { margin-inline: 8px; }
  .shape-tab, .scenario-tab { padding-inline: 8px; }
  .panel-head { display: block; }
  .panel-head > p { max-width: none; margin-top: 10px; text-align: left; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; }
}