:root {
  --void: #090a0c;
  --ink: #111318;
  --ink-raised: #171a20;
  --paper: #e8e7df;
  --soft: #aaa9a4;
  --quiet: #737681;
  --line: rgba(215, 226, 255, .15);
  --cobalt: #6286ff;
  --acid: #c9ff5d;
  --rose: #ff8b76;
  --radius: 18px;
  --shadow: 0 24px 80px rgba(0, 0, 0, .24);
}

* { box-sizing: border-box; }
html { background: var(--void); overflow-x: hidden; }
body { min-width: 320px; margin: 0; overflow-x: hidden; color: var(--paper); background: radial-gradient(circle at 76% -15%, rgba(86, 112, 227, .18), transparent 34rem), var(--void); font-family: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", system-ui, sans-serif; }
button, input, textarea { font: inherit; }
button { cursor: pointer; }
button:focus-visible, input:focus-visible, textarea:focus-visible { outline: 2px solid var(--acid); outline-offset: 3px; }

.workbench { min-height: 100vh; }
.topbar { height: 68px; position: sticky; top: 0; z-index: 20; display: flex; align-items: center; gap: 26px; padding: 0 28px; border-bottom: 1px solid var(--line); background: rgba(9, 10, 12, .88); backdrop-filter: blur(18px); }
.brand { display: inline-flex; align-items: center; gap: 11px; color: var(--paper); text-decoration: none; min-width: 205px; }
.brand-mark { display: grid; place-items: center; width: 29px; height: 29px; color: var(--void); font: 800 17px/1 Georgia, serif; background: var(--acid); border-radius: 50% 50% 46% 50%; box-shadow: 0 0 22px rgba(201, 255, 93, .25); }
.brand strong { display: block; letter-spacing: .12em; font-size: 14px; }
.brand small { display: block; color: var(--quiet); margin-top: 2px; font-size: 8px; font-weight: 700; letter-spacing: .15em; }
.topbar-context { display: flex; align-items: center; gap: 9px; color: var(--soft); font-size: 11px; letter-spacing: .08em; }
.live-dot, .signal { display: inline-block; width: 7px; height: 7px; border-radius: 50%; background: var(--acid); box-shadow: 0 0 12px var(--acid); }
.context-divider { width: 1px; height: 16px; background: var(--line); margin: 0 3px; }
.status-chip { margin-left: auto; display: flex; align-items: center; gap: 11px; padding: 8px 10px 8px 13px; color: var(--soft); background: transparent; border: 1px solid var(--line); border-radius: 999px; font-size: 11px; }
.status-chip b { color: var(--void); padding: 3px 6px; background: var(--acid); border-radius: 99px; font-size: 9px; letter-spacing: .08em; }

.workbench-body { display: grid; grid-template-columns: 238px minmax(0, 1fr); min-height: calc(100vh - 68px); }
.tool-rail { display: flex; flex-direction: column; padding: 28px 16px 20px; border-right: 1px solid var(--line); background: rgba(15, 17, 21, .62); }
.rail-label, .eyebrow { margin: 0; color: var(--quiet); font-size: 10px; font-weight: 800; letter-spacing: .18em; }
.rail-label { padding: 0 12px 10px; }
.rail-label-secondary { padding-top: 29px; }
.tool-nav { display: grid; gap: 3px; }
.tool-link { width: 100%; display: grid; grid-template-columns: 30px minmax(0, 1fr) auto; align-items: center; gap: 5px; padding: 10px 12px; color: var(--soft); text-align: left; background: transparent; border: 0; border-radius: 9px; font-size: 13px; transition: .18s ease; }
.tool-link:hover { color: var(--paper); background: rgba(255, 255, 255, .04); }
.tool-link.is-active { color: var(--void); background: var(--paper); box-shadow: 0 4px 18px rgba(0, 0, 0, .15); }
.tool-index { color: var(--cobalt); font-size: 10px; font-weight: 800; letter-spacing: .04em; }
.tool-link.is-active .tool-index { color: #3b56c4; }
.tool-link i { color: var(--quiet); font-size: 9px; font-style: normal; border: 1px solid currentColor; border-radius: 999px; padding: 2px 5px; }
.tool-link.is-active i { color: #58604e; }
.rail-footer { display: flex; gap: 9px; margin-top: auto; padding: 16px 12px 0; border-top: 1px solid var(--line); color: var(--quiet); font-size: 10px; line-height: 1.55; }
.rail-footer b { color: var(--soft); font-size: 10px; letter-spacing: .04em; }
.rail-footer p { margin: 0; }

.workspace-stage { min-width: 0; padding: 44px clamp(22px, 5vw, 74px) 32px; }
#app-root { min-width: 0; max-width: 1260px; margin: 0 auto; animation: surface-in .42s both; }
@keyframes surface-in { from { opacity: 0; transform: translateY(9px); } to { opacity: 1; transform: translateY(0); } }
.mobile-tool-nav { display: none; }
.surface-header { display: flex; justify-content: space-between; align-items: flex-start; gap: 24px; padding-bottom: 31px; }
.surface-header h1 { max-width: 720px; margin: 9px 0 10px; color: var(--paper); font: 500 clamp(31px, 4vw, 54px)/.98 Georgia, "Noto Serif TC", serif; letter-spacing: -.055em; }
.surface-copy { max-width: 620px; margin: 0; color: var(--soft); font-size: 14px; line-height: 1.8; }
.surface-status { flex: 0 0 auto; color: var(--acid); border: 1px solid rgba(201, 255, 93, .5); padding: 6px 9px; margin-top: 3px; border-radius: 3px; font-size: 10px; font-weight: 800; letter-spacing: .12em; }

.work-grid { display: grid; grid-template-columns: minmax(290px, .88fr) minmax(0, 1.42fr); gap: 14px; }
.panel { border: 1px solid var(--line); border-radius: var(--radius); background: linear-gradient(145deg, rgba(30, 33, 41, .94), rgba(15, 17, 22, .96)); box-shadow: var(--shadow); }
.input-panel, .output-panel { min-height: 550px; padding: clamp(20px, 3vw, 34px); }
.panel-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; padding-bottom: 19px; border-bottom: 1px solid var(--line); }
.panel-head h2 { margin: 7px 0 0; color: var(--paper); font: 500 24px/1.15 Georgia, "Noto Serif TC", serif; letter-spacing: -.04em; }
.brief-form { display: grid; gap: 16px; padding-top: 21px; }
.brief-form label { display: grid; gap: 7px; color: var(--soft); font-size: 11px; font-weight: 700; letter-spacing: .04em; }
.brief-form input, .brief-form textarea { width: 100%; color: var(--paper); background: #0e1015; border: 1px solid rgba(216, 224, 255, .18); border-radius: 8px; padding: 10px 11px; font-size: 13px; line-height: 1.6; resize: vertical; }
.field-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 11px; }
.primary-action, .secondary-action { display: flex; justify-content: space-between; align-items: center; width: 100%; border: 0; border-radius: 8px; padding: 13px 15px; background: var(--acid); color: var(--void); font-size: 12px; font-weight: 900; letter-spacing: .04em; transition: transform .18s, box-shadow .18s; }
.primary-action:hover, .secondary-action:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(201,255,93,.14); }
.primary-action span { font-size: 18px; line-height: .5; }
.form-note, .muted { color: var(--quiet); font-size: 11px; line-height: 1.75; }
.ledger { margin: 22px 0 0; }
.ledger > div, .variable-list > div { display: grid; grid-template-columns: 110px minmax(0, 1fr) auto; gap: 12px; align-items: start; padding: 13px 0; border-bottom: 1px solid var(--line); }
.ledger dt, .variable-list dt { color: var(--quiet); font-size: 10px; font-weight: 800; letter-spacing: .08em; }
.ledger dd, .variable-list dd { margin: 0; color: var(--paper); font-size: 13px; line-height: 1.5; }
.ledger em, .variable-list em { color: var(--cobalt); font-size: 9px; font-style: normal; letter-spacing: .06em; }
.hashtag-block { margin-top: 23px; padding: 17px; border-radius: 10px; background: rgba(98, 134, 255, .09); border: 1px solid rgba(98, 134, 255, .23); }
.hashtag-block b { display: block; margin-top: 6px; color: var(--paper); font-size: 13px; }
.tag-list { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 15px; }
.tag-list span { display: inline-flex; align-items: center; gap: 6px; padding: 6px 8px; color: var(--acid); background: rgba(201,255,93,.07); border: 1px solid rgba(201,255,93,.22); border-radius: 3px; font-size: 11px; }
.tag-list small { color: var(--quiet); font-size: 9px; }
.tag-list.large { margin-top: 27px; }
.boundary-card, .formula-note { margin-top: 23px; padding: 15px 17px; border-left: 2px solid var(--rose); background: rgba(255, 139, 118, .06); }
.boundary-card b, .formula-note b { color: var(--rose); font-size: 11px; }
.boundary-card p, .formula-note p { margin: 7px 0 0; color: var(--soft); font-size: 11px; line-height: 1.75; }

.selection-note { margin-top: 30px; padding: 19px; border: 1px solid rgba(201,255,93,.4); border-radius: 9px; position: relative; overflow: hidden; }
.selection-note::after { content: ""; position: absolute; width: 120px; height: 120px; right: -45px; top: -68px; border: 1px solid rgba(201,255,93,.36); border-radius: 50%; }
.selection-note span, .formula-note > span { display: block; color: var(--acid); font-size: 9px; font-weight: 900; letter-spacing: .14em; }
.selection-note b { display: block; margin-top: 7px; font-size: 15px; }
.selection-note p { position: relative; z-index: 1; margin: 9px 0 0; color: var(--soft); font-size: 12px; line-height: 1.7; }
.case-stack { display: grid; gap: 10px; margin-top: 20px; }
.case-card { padding: 15px; border: 1px solid var(--line); border-radius: 9px; background: rgba(7, 8, 10, .22); }
.case-card.is-selected { border-color: rgba(201,255,93,.53); box-shadow: inset 3px 0 var(--acid); }
.case-card > div { display: flex; gap: 10px; align-items: center; }
.case-card span { color: var(--cobalt); font-size: 10px; font-weight: 800; }
.case-card b { color: var(--paper); font-size: 13px; }
.case-card p { margin: 9px 0; color: var(--soft); font-size: 12px; line-height: 1.65; }
.case-card small { color: var(--quiet); font-size: 10px; }

.script-grid .input-panel { min-height: 680px; }
.variable-list { margin: 15px 0 0; }
.variable-list > div { grid-template-columns: 105px minmax(0, 1fr) auto; }
.status-supplied { color: var(--acid) !important; }
.status-inferred { color: var(--cobalt) !important; }
.status-unresolved { color: var(--rose) !important; }
.formula-note { border-left-color: var(--cobalt); background: rgba(98, 134, 255, .06); }
.formula-note b { display: block; margin-top: 5px; color: var(--paper); font-size: 14px; }
.formula-note small { color: var(--rose); font-size: 10px; line-height: 1.6; }
.package-panel { min-height: 680px; }
.main-script { margin-top: 19px; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
.script-label { padding: 11px 14px; color: var(--cobalt); background: rgba(98,134,255,.1); border-bottom: 1px solid var(--line); font-size: 9px; font-weight: 900; letter-spacing: .12em; }
.main-script section { display: grid; grid-template-columns: 64px minmax(0, 1fr); gap: 12px; padding: 15px; border-bottom: 1px solid var(--line); }
.main-script section:last-child { border: 0; }
.main-script section > span { color: var(--acid); font-size: 10px; font-weight: 800; }
.main-script b { color: var(--paper); font-size: 12px; }
.main-script p { margin: 5px 0; color: var(--soft); font-size: 13px; line-height: 1.65; }
.main-script small { color: var(--quiet); font-size: 9px; letter-spacing: .06em; }
.variation-grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: 10px; margin-top: 13px; }
.variation-grid > div { padding: 14px; border: 1px solid var(--line); border-radius: 9px; }
.variation-grid > div:first-child { border-color: rgba(201,255,93,.22); }
.variation-grid p { display: grid; grid-template-columns: 22px 1fr; gap: 7px; margin: 10px 0 0; color: var(--soft); font-size: 11px; line-height: 1.6; }
.variation-grid p span { color: var(--acid); font-size: 9px; font-weight: 800; }
.caveat-line { display: grid; grid-template-columns: 140px minmax(0, 1fr); gap: 13px; margin-top: 14px; padding-top: 13px; border-top: 1px solid var(--line); color: var(--quiet); font-size: 10px; line-height: 1.65; }
.caveat-line b { color: var(--rose); font-size: 10px; }

.trace { counter-reset: trace; display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; margin: 30px 0 0; padding: 0; list-style: none; overflow: hidden; border: 1px solid var(--line); border-radius: 10px; background: rgba(17, 19, 24, .8); }
.trace li { min-height: 73px; position: relative; padding: 13px 15px 12px 39px; border-right: 1px solid var(--line); }
.trace li:last-child { border-right: 0; }
.trace li > span { position: absolute; left: 14px; top: 15px; color: var(--quiet); font-size: 9px; font-weight: 800; }
.trace li.is-resolved::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 3px; background: var(--acid); box-shadow: 0 0 14px rgba(201,255,93,.65); }
.trace b { display: block; color: var(--soft); font-size: 11px; }
.trace .is-resolved b { color: var(--paper); }
.trace small { display: block; margin-top: 5px; color: var(--quiet); font-size: 9px; line-height: 1.35; }

.placeholder { min-height: 480px; max-width: 850px; margin: 4vh auto 0; padding: clamp(31px, 6vw, 76px); position: relative; overflow: hidden; }
.placeholder-number { position: absolute; right: -22px; top: -57px; color: rgba(98, 134, 255, .13); font: 300 230px/.9 Georgia, serif; }
.placeholder h2 { margin: 12px 0; color: var(--paper); font: 500 54px/.95 Georgia, "Noto Serif TC", serif; letter-spacing: -.06em; }
.placeholder > p:not(.eyebrow) { max-width: 480px; color: var(--soft); font-size: 14px; line-height: 1.85; }
.placeholder > div:not(.placeholder-number) { display: flex; flex-wrap: wrap; gap: 8px; margin: 26px 0; }
.placeholder > div span { color: var(--quiet); padding: 6px 9px; border: 1px solid var(--line); border-radius: 99px; font-size: 10px; }
.secondary-action { width: auto; background: transparent; color: var(--paper); border: 1px solid var(--paper); }

@media (max-width: 860px) {
  .topbar { height: 58px; padding: 0 17px; gap: 10px; }
  .brand { min-width: auto; }
  .brand small, .topbar-context, .status-chip span { display: none; }
  .status-chip { padding: 7px; }
  .workbench-body { display: block; min-height: calc(100vh - 58px); }
  .tool-rail { display: none; }
  .workspace-stage { min-width: 0; padding: 17px 14px 28px; }
  .mobile-tool-nav { display: flex; gap: 7px; max-width: 100%; overflow-x: auto; overscroll-behavior-x: contain; padding: 0 0 19px; scrollbar-width: thin; }
  .mobile-tool-nav button { display: inline-flex; flex: 0 0 auto; align-items: center; gap: 5px; min-width: max-content; padding: 7px 10px; color: var(--quiet); background: transparent; border: 1px solid var(--line); border-radius: 99px; font-size: 11px; white-space: nowrap; }
  .mobile-tool-nav i { color: var(--rose); font-size: 9px; font-style: normal; letter-spacing: .03em; }
  .mobile-tool-nav button.is-active i { color: #526927; }
  .mobile-tool-nav button.is-active { color: var(--void); border-color: var(--acid); background: var(--acid); font-weight: 800; }
  .surface-header { gap: 12px; padding: 10px 4px 23px; }
  .surface-header h1 { margin-top: 7px; font-size: 37px; }
  .surface-copy { font-size: 12px; line-height: 1.7; }
  .surface-status { font-size: 8px; white-space: nowrap; }
  .work-grid { display: block; inline-size: 100%; max-inline-size: 100%; min-inline-size: 0; }
  .work-grid > .panel { display: block; inline-size: 100%; max-inline-size: 100%; min-inline-size: 0; }
  .work-grid > .panel + .panel { margin-top: 14px; }
  .variation-grid { grid-template-columns: 1fr; }
  .input-panel, .output-panel, .script-grid .input-panel, .package-panel { min-height: 0; padding: 20px; }
  .trace { grid-template-columns: 1fr; }
  .trace li { min-height: 0; border-right: 0; border-bottom: 1px solid var(--line); }
  .trace li:last-child { border-bottom: 0; }
  .field-pair { grid-template-columns: 1fr; }
  .ledger > div, .variable-list > div { grid-template-columns: 90px minmax(0, 1fr); }
  .ledger em, .variable-list em { grid-column: 2; }
  .main-script section { grid-template-columns: 52px minmax(0, 1fr); }
  .caveat-line { grid-template-columns: 1fr; gap: 5px; }
}

@media (max-width: 430px) {
  .topbar { padding: 0 14px; }
  .brand strong { font-size: 12px; }
  .surface-header { display: grid; grid-template-columns: minmax(0, 1fr); }
  .surface-status { justify-self: start; margin-top: 0; white-space: normal; }
  .surface-header h1, .panel-head h2, .placeholder h2 { overflow-wrap: anywhere; }
  .workspace-stage, #app-root, .work-grid, .work-grid > *, .brief-form, .field-pair, .ledger, .ledger > div, .variable-list, .variable-list > div, .main-script, .variation-grid, .trace { min-inline-size: 0; max-inline-size: 100%; }
  .panel-head { display: grid; grid-template-columns: minmax(0, 1fr); min-inline-size: 0; max-inline-size: 100%; }
  .panel-head > *, .panel-head h2, .panel-head .surface-status { min-inline-size: 0; max-inline-size: 100%; overflow-wrap: anywhere; }
  .input-panel, .output-panel, .script-grid .input-panel, .package-panel { min-inline-size: 0; max-inline-size: 100%; padding: 18px; }
  .brief-form input, .brief-form textarea { min-inline-size: 0; max-inline-size: 100%; }
  .ledger > div, .variable-list > div { grid-template-columns: minmax(0, 1fr); gap: 4px; }
  .ledger em, .variable-list em { grid-column: auto; }
  .main-script section { grid-template-columns: 1fr; gap: 5px; }
  .placeholder { padding: 28px 20px; }
  .placeholder-number { right: -38px; font-size: 180px; }
}