:root {
  --ink: #15241f;
  --green: #173f35;
  --green-2: #2c6655;
  --paper: #f4f0e6;
  --cream: #fffaf0;
  --yellow: #f2c14e;
  --orange: #ef7a4a;
  --blue: #77aab3;
  --muted: #6e7a73;
  --line: rgba(21, 36, 31, .15);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif; }
button, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button { color: inherit; }
a { color: inherit; text-decoration: none; }
.scenario-noise { position: fixed; inset: 0; z-index: 20; opacity: .24; pointer-events: none; background-image: radial-gradient(circle at 18% 27%, rgba(21,36,31,.08) 0 1px, transparent 1.5px), radial-gradient(circle at 74% 63%, rgba(21,36,31,.05) 0 1px, transparent 1.5px); background-size: 19px 23px, 29px 31px; }

.scenario-topbar { width: min(1400px, calc(100% - 48px)); height: 92px; margin: auto; display: flex; align-items: center; justify-content: space-between; }
.scenario-brand { display: flex; align-items: center; gap: 12px; }
.scenario-brand-mark { width: 52px; height: 52px; display: grid; place-items: center; color: var(--cream); border-radius: 16px 16px 16px 5px; background: var(--green); font-family: Georgia, serif; font-size: 22px; }
.scenario-brand-mark span { color: var(--yellow); font-size: 13px; }
.scenario-brand > span:last-child { display: flex; flex-direction: column; }
.scenario-brand strong { font-family: Georgia, "Songti SC", serif; font-size: 18px; }
.scenario-brand small { margin-top: 2px; color: var(--muted); font-size: 7px; letter-spacing: .18em; }
.scenario-topbar nav { display: flex; gap: 36px; font-size: 13px; }
.scenario-topbar nav a { position: relative; padding: 8px 0; }
.scenario-topbar nav a.active::after { content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 2px; background: var(--orange); }
.outline-button, .primary-button { border: 0; border-radius: 999px; cursor: pointer; }
.outline-button { padding: 10px 17px; border: 1px solid var(--ink); background: transparent; font-size: 12px; }
.outline-button:hover { color: var(--cream); background: var(--ink); }

main { overflow: hidden; }
.scenario-intro { width: min(1320px, calc(100% - 48px)); min-height: 490px; margin: auto; display: grid; grid-template-columns: 1.7fr .8fr; align-items: center; gap: 80px; }
.eyebrow { display: flex; align-items: center; gap: 10px; color: var(--green-2); font-size: 10px; font-weight: 800; letter-spacing: .18em; }
.eyebrow i { width: 28px; height: 2px; background: var(--orange); }
h1 { max-width: 900px; margin: 22px 0 0; font-family: Georgia, "Songti SC", serif; font-size: clamp(64px, 8vw, 126px); font-weight: 400; line-height: .98; letter-spacing: -.055em; }
h1 em { display: block; color: var(--orange); font-weight: 400; }
.scenario-intro > p { align-self: end; margin: 0 0 90px; padding-left: 24px; border-left: 1px solid var(--line); color: var(--muted); font-size: 17px; line-height: 1.8; }

.scenario-input { padding: 58px max(24px, calc((100vw - 1320px) / 2)); display: grid; grid-template-columns: 360px 1fr; gap: 60px; color: var(--cream); background: var(--green); }
.scenario-input-copy > span, .scenario-principle > span { color: #a9c2b8; font-size: 9px; letter-spacing: .2em; }
.scenario-input-copy h2 { margin: 15px 0 12px; font-family: Georgia, "Songti SC", serif; font-size: 36px; font-weight: 400; }
.scenario-input-copy p { margin: 0; color: #a9c2b8; font-size: 12px; line-height: 1.8; }
#scenarioForm { min-width: 0; }
.ocr-row { margin-bottom: 12px; }
.ocr-upload { min-height: 76px; padding: 13px 16px; display: grid; grid-template-columns: 48px 1fr auto; align-items: center; gap: 13px; color: var(--cream); border: 1px dashed rgba(242,193,78,.5); border-radius: 17px; background: rgba(242,193,78,.055); cursor: pointer; transition: border-color .2s, background .2s; }
.ocr-upload:hover { border-color: var(--yellow); background: rgba(242,193,78,.1); }
.ocr-upload-mark { width: 46px; height: 46px; display: grid; place-items: center; color: var(--ink); border-radius: 13px 13px 13px 4px; background: var(--yellow); font-size: 10px; font-weight: 900; letter-spacing: .08em; }
.ocr-upload > span:nth-child(2) { min-width: 0; display: flex; flex-direction: column; }
.ocr-upload strong { font-size: 13px; }
.ocr-upload small { margin-top: 5px; color: #9fb8ae; font-size: 9px; line-height: 1.5; }
.ocr-upload b { color: var(--yellow); font-size: 10px; white-space: nowrap; }
.ocr-preview { min-height: 76px; padding: 9px 12px; display: grid; grid-template-columns: 70px 1fr auto; align-items: center; gap: 13px; border: 1px solid rgba(255,255,255,.15); border-radius: 17px; background: rgba(255,255,255,.055); }
.ocr-preview[hidden] { display: none; }
.ocr-preview img { width: 70px; height: 56px; object-fit: cover; border-radius: 10px; background: var(--paper); }
.ocr-preview > span { min-width: 0; display: flex; flex-direction: column; }
.ocr-preview strong { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 11px; }
.ocr-preview small { margin-top: 6px; color: var(--yellow); font-size: 9px; }
.ocr-preview button { padding: 8px 10px; color: #bfd1c9; border: 1px solid rgba(255,255,255,.16); border-radius: 999px; background: transparent; cursor: pointer; font-size: 9px; }
#scenarioPrompt { width: 100%; min-height: 130px; padding: 20px; resize: vertical; color: var(--cream); border: 1px solid rgba(255,255,255,.2); outline: 0; border-radius: 18px; background: rgba(255,255,255,.06); font-size: 15px; line-height: 1.7; }
#scenarioPrompt:focus { border-color: var(--yellow); box-shadow: 0 0 0 3px rgba(242,193,78,.12); }
#scenarioPrompt::placeholder { color: #8fa89e; }
.input-actions { margin-top: 12px; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.sample-prompts { display: flex; flex-wrap: wrap; gap: 8px; }
.sample-prompts button { padding: 8px 11px; color: #bfd1c9; border: 1px solid rgba(255,255,255,.18); border-radius: 999px; background: transparent; cursor: pointer; font-size: 10px; }
.sample-prompts button:hover { color: var(--green); background: var(--cream); }
.sample-prompts button.active { color: var(--ink); border-color: var(--yellow); background: var(--yellow); }
.primary-button { flex: 0 0 auto; padding: 13px 19px; color: var(--ink); background: var(--yellow); font-weight: 800; font-size: 12px; }
.primary-button:disabled { opacity: .6; cursor: wait; }
.primary-button span { margin-left: 8px; }
.scenario-status { min-height: 18px; margin: 11px 2px 0; color: #a9c2b8; font-size: 10px; }

.scenario-lab { padding: 90px max(24px, calc((100vw - 1440px) / 2)) 110px; color: var(--cream); background: #102f28; }
.scenario-heading { margin-bottom: 32px; display: flex; align-items: end; justify-content: space-between; gap: 40px; }
.scenario-heading > div:first-child > span { color: var(--yellow); font-size: 9px; font-weight: 800; letter-spacing: .16em; }
.scenario-heading h2 { margin: 11px 0 8px; font-family: Georgia, "Songti SC", serif; font-size: clamp(42px, 5vw, 72px); font-weight: 400; }
.scenario-heading p { max-width: 720px; margin: 0; color: #aec2ba; line-height: 1.7; }
.scenario-question { max-width: 300px; padding: 16px 18px; color: var(--ink); border-radius: 16px 16px 16px 4px; background: var(--yellow); }
.scenario-question small { display: block; margin-bottom: 6px; font-size: 8px; letter-spacing: .12em; }
.scenario-question strong { font-family: Georgia, "Songti SC", serif; font-size: 15px; line-height: 1.5; }

.process-map { margin-bottom: 15px; display: grid; grid-template-columns: repeat(var(--stage-count, 2), minmax(145px, 1fr)); gap: 8px; overflow-x: auto; scrollbar-width: thin; }
.process-node { position: relative; min-height: 82px; padding: 14px 16px 12px; text-align: left; color: #9fb8ae; border: 1px solid rgba(255,255,255,.13); border-radius: 14px; background: rgba(255,255,255,.025); cursor: pointer; }
.process-node::after { content: ""; position: absolute; left: 15px; right: 100%; bottom: 0; height: 3px; border-radius: 3px; background: var(--yellow); transition: right .35s; }
.process-node.done::after, .process-node.active::after { right: 15px; }
.process-node.active { color: var(--cream); border-color: rgba(242,193,78,.8); background: rgba(242,193,78,.07); }
.process-node > span { display: block; color: var(--yellow); font-size: 8px; letter-spacing: .14em; }
.process-node strong { display: block; margin-top: 7px; font-size: 13px; }
.process-node small { display: block; margin-top: 4px; color: #7f9c91; font-size: 9px; }

.scenario-workspace { display: grid; grid-template-columns: minmax(0, 1fr) 340px; overflow: hidden; border: 1px solid rgba(255,255,255,.14); border-radius: 26px; background: var(--paper); box-shadow: 0 30px 80px rgba(0,0,0,.2); }
.scenario-stage { min-width: 0; overflow: hidden; }
.stage-toolbar { height: 50px; padding: 0 18px; display: flex; align-items: center; justify-content: space-between; color: var(--ink); border-bottom: 1px solid var(--line); font-size: 10px; }
.stage-toolbar > span:first-child { display: flex; align-items: center; gap: 8px; }
.stage-toolbar i { width: 7px; height: 7px; border-radius: 50%; background: #57a176; box-shadow: 0 0 0 4px rgba(87,161,118,.14); }
.scenario-canvas-wrap { position: relative; width: 100%; min-width: 0; aspect-ratio: 5 / 3; min-height: 420px; overflow: hidden; }
#scenarioCanvas { width: 100%; max-width: 100%; height: 100%; display: block; }
.stage-chip { position: absolute; top: 17px; left: 17px; padding: 8px 11px; color: var(--cream); border-radius: 999px; background: var(--green); font-size: 9px; letter-spacing: .06em; }
.handoff-card { position: absolute; right: 17px; top: 17px; max-width: 255px; padding: 13px 15px; color: var(--ink); border: 1px solid rgba(21,36,31,.12); border-radius: 13px 13px 13px 4px; background: rgba(255,250,240,.94); box-shadow: 0 8px 30px rgba(21,36,31,.12); }
.handoff-card span { display: block; color: var(--orange); font-size: 8px; font-weight: 900; letter-spacing: .14em; }
.handoff-card strong { display: block; margin-top: 5px; font-size: 11px; }
.handoff-card small { display: block; margin-top: 4px; color: var(--green-2); font-family: Georgia, serif; font-size: 13px; }
.transport-controls { min-height: 64px; padding: 10px 16px; display: flex; align-items: center; justify-content: center; gap: 8px; border-top: 1px solid var(--line); }
.transport-controls button { padding: 9px 13px; border: 1px solid var(--line); border-radius: 999px; background: transparent; cursor: pointer; font-size: 10px; }
.transport-controls button:hover { border-color: var(--green); }
.transport-controls .play-button { min-width: 72px; color: var(--cream); border-color: var(--green); background: var(--green); }
.transport-controls button:disabled { opacity: .35; cursor: not-allowed; }

.stage-notes { padding: 30px 26px; color: var(--cream); background: var(--green); }
.stage-index { color: #9bb4aa; font-size: 8px; letter-spacing: .18em; }
.stage-notes h3 { margin: 12px 0 11px; font-family: Georgia, "Songti SC", serif; font-size: 30px; font-weight: 400; line-height: 1.2; }
.stage-notes > p { min-height: 76px; margin: 0; color: #b3c7bf; font-size: 12px; line-height: 1.75; }
.formula-panel { margin-top: 22px; padding: 17px; color: var(--ink); border-radius: 16px; background: var(--yellow); }
.formula-panel small, .causal-note small { display: block; margin-bottom: 7px; font-size: 8px; letter-spacing: .12em; }
.formula-panel strong { font-family: Georgia, "Times New Roman", serif; font-size: 17px; font-weight: 400; line-height: 1.5; }
.value-grid { margin-top: 13px; display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.stage-value { padding: 12px; border: 1px solid rgba(255,255,255,.12); border-radius: 12px; }
.stage-value span { display: block; color: #8fa89e; font-size: 8px; }
.stage-value strong { display: block; margin-top: 6px; color: var(--yellow); font-family: Georgia, serif; font-size: 16px; font-weight: 400; }
.causal-note { margin-top: 20px; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.13); }
.causal-note small { color: #8fa89e; }
.causal-note p { margin: 0; color: #c8d8d2; font-size: 11px; line-height: 1.7; }
.scenario-warning { margin: 15px 0 0; padding: 12px 15px; color: #ffdfd2; border: 1px solid rgba(239,122,74,.3); border-radius: 12px; background: rgba(239,122,74,.08); font-size: 11px; }

.scenario-principle { padding: 110px max(24px, calc((100vw - 1320px) / 2)); display: grid; grid-template-columns: .65fr 1fr 1fr; gap: 60px; }
.scenario-principle > span { color: var(--green-2); }
.scenario-principle h2 { margin: 0; font-family: Georgia, "Songti SC", serif; font-size: clamp(44px, 5vw, 72px); font-weight: 400; line-height: 1.15; }
.scenario-principle > div { display: grid; gap: 18px; }
.scenario-principle p { margin: 0; display: grid; grid-template-columns: 32px 1fr; gap: 12px; color: var(--muted); line-height: 1.7; }
.scenario-principle b { color: var(--orange); font-size: 10px; }
.scenario-footer { min-height: 92px; padding: 24px max(24px, calc((100vw - 1320px) / 2)); display: flex; align-items: center; justify-content: space-between; gap: 20px; color: #9bb4aa; border-top: 1px solid rgba(255,255,255,.1); background: var(--green); font-size: 10px; letter-spacing: .08em; }
.scenario-footer a { color: inherit; text-decoration: none; }
.scenario-footer a:hover { color: var(--yellow); text-decoration: underline; }
.toast { position: fixed; z-index: 30; left: 50%; bottom: 28px; padding: 11px 16px; color: var(--cream); border-radius: 999px; background: var(--ink); box-shadow: 0 10px 30px rgba(0,0,0,.22); opacity: 0; transform: translate(-50%, 16px); pointer-events: none; transition: .25s; font-size: 11px; }
.toast.show { opacity: 1; transform: translate(-50%, 0); }

@media (max-width: 1180px) {
  .scenario-intro { grid-template-columns: 1fr .6fr; }
  .scenario-input { grid-template-columns: 280px 1fr; gap: 35px; }
  .scenario-workspace { grid-template-columns: 1fr; }
  .stage-notes { display: grid; grid-template-columns: 150px 1fr 1fr; gap: 18px; align-items: start; }
  .stage-index { grid-column: 1; }
  .stage-notes h3 { grid-column: 1; margin-top: -2px; }
  .stage-notes > p { grid-column: 2; grid-row: 1 / span 2; }
  .formula-panel { grid-column: 3; grid-row: 1 / span 2; margin-top: 0; }
  .value-grid, .causal-note { grid-column: 1 / -1; }
  .value-grid { grid-template-columns: repeat(4, 1fr); }
  .scenario-principle { grid-template-columns: 180px 1fr; }
  .scenario-principle > div { grid-column: 2; }
}

@media (max-width: 720px) {
  .scenario-topbar { width: calc(100% - 28px); height: 76px; }
  .scenario-topbar nav { display: none; }
  .scenario-brand-mark { width: 43px; height: 43px; border-radius: 13px 13px 13px 4px; }
  .outline-button { padding: 8px 11px; }
  .scenario-intro { width: calc(100% - 28px); min-height: 410px; display: block; padding-top: 74px; }
  h1 { font-size: clamp(58px, 18vw, 84px); }
  .scenario-intro > p { margin-top: 45px; }
  .scenario-input { padding: 42px 14px; display: block; }
  #scenarioForm { margin-top: 25px; }
  .ocr-upload { grid-template-columns: 44px 1fr; }
  .ocr-upload b { grid-column: 2; }
  .ocr-preview { grid-template-columns: 58px 1fr; }
  .ocr-preview img { width: 58px; height: 52px; }
  .ocr-preview button { grid-column: 2; justify-self: start; }
  .input-actions { align-items: stretch; flex-direction: column; }
  .primary-button { width: 100%; }
  .scenario-lab { padding: 60px 14px 80px; }
  .scenario-heading { align-items: stretch; flex-direction: column; }
  .scenario-question { max-width: none; }
  .process-map { display: flex; overflow-x: auto; padding-bottom: 5px; }
  .process-node { min-width: 180px; }
  .scenario-workspace { border-radius: 20px; }
  .scenario-canvas-wrap { min-height: 330px; aspect-ratio: auto; }
  .handoff-card { top: auto; bottom: 12px; left: 12px; right: 12px; max-width: none; }
  .transport-controls { flex-wrap: wrap; }
  .stage-notes { display: block; padding: 24px 20px; }
  .stage-notes h3 { margin-top: 10px; }
  .stage-notes > p { min-height: 0; }
  .formula-panel { margin-top: 18px; }
  .value-grid { grid-template-columns: 1fr 1fr; }
  .scenario-principle { padding: 80px 14px; display: block; }
  .scenario-principle h2 { margin-top: 18px; }
  .scenario-principle > div { margin-top: 48px; }
  .scenario-footer { flex-direction: column; justify-content: center; text-align: center; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; }
}