@font-face{font-family:Saira;src:url('./vendor/fonts/saira-latin.woff2') format('woff2');font-weight:100 900;font-display:swap}
@font-face{font-family:'IBM Plex Sans';src:url('./vendor/fonts/ibm-plex-sans-latin.woff2') format('woff2');font-weight:100 900;font-display:swap}
@font-face{font-family:'IBM Plex Mono';src:url('./vendor/fonts/ibm-plex-mono-latin.woff2') format('woff2');font-weight:400;font-display:swap}

:root {
  --background: #f7f6f1;
  --foreground: #141824;
  --brand: #5b52e8;
  --brand-d: #4c43d6;
  --brand-tint: rgba(91, 82, 232, 0.075);
  --brand-tint-strong: rgba(91, 82, 232, 0.14);
  --live: #08a585;
  --live-hi: #0b8e74;
  --live-ink: #077a63;
  --scan: rgba(8, 165, 133, 0.12);
  --text-heading: #141824;
  --text-body: #5c6374;
  --text-muted: #666c80;
  --surface-a: #fbfaf6;
  --surface-b: #f1efe5;
  --card: #ffffff;
  --border: #e6e3d8;
  --border-strong: #d3cfc0;
  --amber: #b45309;
  --danger: #b3261e;
  --danger-tint: rgba(179, 38, 30, 0.07);
  --sh-md: 0 12px 34px rgba(30, 30, 50, 0.08);
  --display: Saira, system-ui, sans-serif;
  --sans: 'IBM Plex Sans', system-ui, sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, monospace;
  --radius: 10px;
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  background: var(--background);
  color: var(--text-body);
  font: 14px/1.45 var(--sans);
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3 { font-family: var(--display); color: var(--text-heading); margin: 0; letter-spacing: 0.01em; }
button, input, select { font: inherit; color: inherit; }
.mono { font-family: var(--mono); font-size: 12px; }
.muted { color: var(--text-muted); }
[hidden] { display: none !important; }

/* ---------- header ---------- */
.topbar {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; gap: 22px;
  height: 52px; padding: 0 24px;
  background: rgba(247, 246, 241, 0.86); backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 10px; font-family: var(--display); font-weight: 700; color: var(--text-heading); text-decoration: none; font-size: 16px; }
.brand-mark { width: 26px; height: 26px; border-radius: 7px; background: var(--brand); display: grid; place-items: center; }
.steps { display: flex; gap: 4px; margin-left: 8px; }
.step { padding: 5px 11px; border-radius: 7px; font-size: 13px; color: var(--text-muted); display: flex; gap: 7px; align-items: center; }
.step b { font-family: var(--mono); font-weight: 400; font-size: 11px; width: 18px; height: 18px; border-radius: 50%; display: grid; place-items: center; border: 1px solid var(--border-strong); }
.step.active { background: var(--scan); color: var(--live-ink); }
.step.active b { border-color: var(--live); background: var(--live); color: #fff; }
.step.done b { border-color: var(--live); color: var(--live-ink); }
.topbar .spacer { flex: 1; }
.save-state { font-size: 12px; color: var(--text-muted); }

/* ---------- buttons & inputs ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 7px; justify-content: center;
  height: 34px; padding: 0 14px; border-radius: 8px; cursor: pointer;
  border: 1px solid var(--border-strong); background: var(--card); color: var(--text-heading);
  font-weight: 600; font-size: 13px; white-space: nowrap;
  transition: background .15s, border-color .15s, box-shadow .15s;
}
.btn:hover { border-color: var(--brand); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn.primary { background: var(--live); border-color: var(--live); color: #fff; }
.btn.primary:hover { background: var(--live-hi); }
.btn.brand { background: var(--brand); border-color: var(--brand); color: #fff; }
.btn.brand:hover { background: var(--brand-d); }
.btn.ghost { background: transparent; border-color: transparent; color: var(--text-body); }
.btn.ghost:hover { background: var(--surface-b); }
.btn.danger { color: var(--danger); }
.btn.danger:hover { border-color: var(--danger); background: var(--danger-tint); }
.btn.sm { height: 28px; padding: 0 10px; font-size: 12px; }
.btn svg { width: 15px; height: 15px; }

.field { display: flex; flex-direction: column; gap: 5px; min-width: 0; }
.field > span { font-size: 12px; font-weight: 600; color: var(--text-heading); }
.field small { font-size: 11px; color: var(--text-muted); }
.input, select.input {
  height: 34px; padding: 0 10px; border-radius: 8px; width: 100%;
  border: 1px solid var(--border); background: var(--surface-a);
}
.input:focus { outline: 2px solid var(--brand-tint-strong); border-color: var(--brand); }
.check { display: inline-flex; gap: 8px; align-items: center; font-size: 13px; cursor: pointer; }
.check input { accent-color: var(--live); width: 15px; height: 15px; }

.card { background: var(--card); border: 1px solid var(--border); border-radius: 14px; box-shadow: 0 1px 0 rgba(20,24,36,.02); }

/* ---------- start screen ---------- */
.start { max-width: 1080px; margin: 0 auto; padding: 48px 24px 64px; }
.start h1 { font-size: 34px; line-height: 1.15; }
.start .lede { max-width: 640px; font-size: 16px; margin: 12px 0 28px; }
.drop {
  display: block; margin-top: 4px;
  border: 1.5px dashed var(--border-strong); border-radius: 16px; background: var(--card);
  padding: 44px 24px; text-align: center; cursor: pointer; transition: border-color .15s, background .15s;
}
.drop:hover, .drop.over { border-color: var(--live); background: #fcfffd; }
.drop h2 { font-size: 20px; margin: 10px 0 6px; }
.drop .icon { width: 46px; height: 46px; margin: 0 auto; border-radius: 12px; background: var(--scan); color: var(--live-ink); display: grid; place-items: center; }
.drop .icon svg { width: 24px; height: 24px; }
.upload-progress { height: 6px; border-radius: 4px; background: var(--surface-b); overflow: hidden; margin: 18px auto 0; max-width: 360px; }
.upload-progress div { height: 100%; width: 0; background: var(--live); transition: width .2s; }
.section-title { font-size: 15px; margin: 34px 0 12px; }
.presets { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.preset { text-align: left; padding: 14px; border-radius: 12px; border: 1px solid var(--border); background: var(--card); cursor: pointer; }
.preset:hover { border-color: var(--brand); }
.preset.selected { border-color: var(--live); background: var(--scan); }
.preset strong { display: block; color: var(--text-heading); font-size: 13px; margin-bottom: 4px; }
.preset span { font-size: 12px; }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.recent { display: grid; gap: 8px; }
.recent a { display: flex; justify-content: space-between; gap: 12px; padding: 10px 14px; border-radius: 10px; border: 1px solid var(--border); background: var(--card); text-decoration: none; color: var(--text-heading); }
.recent a:hover { border-color: var(--brand); }

/* ---------- workspace ---------- */
.workspace { max-width: 1680px; margin: 0 auto; padding: 18px 24px 28px; }
.ws-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 16px; margin-bottom: 14px; }
.ws-head h1 { font-size: 26px; word-break: break-all; }
.back { font-size: 12px; font-weight: 600; color: var(--text-body); text-decoration: none; display: inline-flex; gap: 5px; margin-top: 4px; }
.back:hover { color: var(--brand); }

.settings { padding: 14px 16px; margin-bottom: 10px; }
.settings-grid { display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 12px; }
.settings-foot { display: flex; align-items: center; gap: 10px; margin-top: 12px; flex-wrap: wrap; }
.settings-foot .summary { flex: 1; text-align: right; font-family: var(--mono); font-size: 12px; color: var(--text-body); }
.advanced { margin-top: 12px; border-top: 1px solid var(--border); padding-top: 12px; }
.advanced-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; }
.advanced h3 { font-size: 13px; margin-bottom: 8px; }
.advanced .group { display: grid; gap: 8px; align-content: start; }
.notes { margin: 0 0 12px; padding: 0 0 0 18px; font-size: 12.5px; }
.notes li { margin: 2px 0; }
.notes .warn { color: var(--amber); }
.notes .unit-warning { background: rgba(180, 83, 9, 0.07); border: 1px solid rgba(180, 83, 9, 0.25); border-radius: 9px; padding: 8px 12px; margin: 0 0 8px -18px; list-style: none; color: var(--text-heading); }
.notes .unit-warning strong { color: var(--amber); }

.panes { display: grid; grid-template-columns: 280px minmax(0, 1fr) 360px; gap: 12px; align-items: start; }
.pane { padding: 14px; }
.pane h2 { font-size: 15px; margin-bottom: 10px; display: flex; justify-content: space-between; align-items: center; }
.pane h2 .mono { font-family: var(--mono); font-weight: 400; color: var(--text-muted); }

.layers { display: grid; gap: 4px; }
.layer {
  display: grid; grid-template-columns: 12px 1fr auto auto; gap: 9px; align-items: center;
  padding: 7px 8px; border-radius: 8px; border: 1px solid transparent; cursor: pointer;
}
.layer:hover { background: var(--surface-a); }
.layer.active { background: var(--scan); border-color: rgba(8,165,133,.35); }
.layer .swatch { width: 12px; height: 12px; border-radius: 3px; }
.layer .name { font-size: 12.5px; font-weight: 600; color: var(--text-heading); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.layer .name small { display: block; font-weight: 400; color: var(--text-muted); font-size: 11px; }
.layer .count { font-family: var(--mono); font-size: 11px; color: var(--text-muted); }
.icon-btn { width: 26px; height: 26px; border-radius: 6px; border: 0; background: transparent; cursor: pointer; display: grid; place-items: center; color: var(--text-muted); }
.icon-btn:hover { background: var(--surface-b); color: var(--text-heading); }
.icon-btn.off { opacity: .45; }
.icon-btn svg { width: 15px; height: 15px; }

.entity-list { margin-top: 12px; border-top: 1px solid var(--border); padding-top: 10px; }
.entity-list .input { height: 30px; font-size: 12px; margin-bottom: 8px; }
.entities { max-height: 340px; overflow: auto; display: grid; gap: 2px; }
.entity { display: flex; justify-content: space-between; gap: 8px; padding: 6px 8px; border-radius: 7px; cursor: pointer; font-size: 12px; color: var(--text-heading); }
.entity:hover { background: var(--surface-a); }
.entity.selected { background: var(--brand-tint-strong); }
.entity .mono { color: var(--text-muted); font-size: 11px; }

.viewer-wrap { padding: 0; overflow: hidden; position: relative; }
.viewer { position: relative; height: calc(100vh - 400px); min-height: 460px; background: #0c1019; }
.viewer canvas { display: block; width: 100%; height: 100%; outline: none; }
.viewer.tool-measure canvas, .viewer.tool-draw canvas { cursor: crosshair; }
.toolbar {
  position: absolute; top: 12px; left: 12px; display: flex; gap: 6px; flex-wrap: wrap; z-index: 2;
}
.tool-group { display: flex; background: var(--card); border: 1px solid var(--border); border-radius: 9px; padding: 3px; gap: 2px; box-shadow: var(--sh-md); }
.tool {
  height: 30px; padding: 0 10px; display: inline-flex; gap: 6px; align-items: center; border-radius: 7px; border: 0;
  background: transparent; cursor: pointer; font-size: 12px; font-weight: 600; color: var(--text-body);
}
.tool:hover { background: var(--surface-b); color: var(--text-heading); }
.tool.active { background: var(--brand); color: #fff; }
.tool svg { width: 15px; height: 15px; }
.tool kbd { font-family: var(--mono); font-size: 10px; opacity: .6; }
.viewer-foot {
  display: flex; gap: 14px; align-items: center; padding: 8px 14px; border-top: 1px solid var(--border);
  font-size: 11.5px; color: var(--text-muted); background: var(--card);
}
.viewer-foot .dot { width: 8px; height: 8px; border-radius: 50%; display: inline-block; margin-right: 5px; }
.viewer-foot .spacer { flex: 1; }
.viewer-foot input[type=range] { width: 90px; accent-color: var(--brand); }
.measure-readout {
  position: absolute; left: 12px; bottom: 12px; z-index: 2; background: rgba(20,24,36,.86); color: #fff;
  font-family: var(--mono); font-size: 12px; padding: 8px 11px; border-radius: 8px; line-height: 1.6;
}
.hint {
  position: absolute; right: 12px; top: 12px; z-index: 2; max-width: 260px; font-size: 12px;
  background: var(--card); border: 1px solid var(--border); border-radius: 9px; padding: 8px 11px; box-shadow: var(--sh-md);
}

.overlay {
  position: absolute; inset: 0; z-index: 5; display: grid; place-items: center;
  background: rgba(247, 246, 241, 0.88); backdrop-filter: blur(3px);
}
.progress-card { width: min(420px, 90%); padding: 22px; }
.progress-card h3 { font-size: 17px; margin-bottom: 4px; }
.stages { list-style: none; padding: 0; margin: 16px 0 0; display: grid; gap: 8px; }
.stages li { display: flex; gap: 10px; align-items: center; font-size: 13px; color: var(--text-muted); }
.stages li .st { width: 18px; height: 18px; border-radius: 50%; border: 1.5px solid var(--border-strong); display: grid; place-items: center; flex: none; }
.stages li.done { color: var(--text-heading); }
.stages li.done .st { background: var(--live); border-color: var(--live); color: #fff; }
.stages li.active { color: var(--text-heading); font-weight: 600; }
.stages li.active .st { border-color: var(--brand); border-top-color: transparent; animation: spin .8s linear infinite; }
.stages li.skip { opacity: .45; }
@keyframes spin { to { transform: rotate(360deg); } }
.error-box { color: var(--danger); background: var(--danger-tint); border-radius: 8px; padding: 10px 12px; font-size: 13px; margin-top: 12px; word-break: break-word; }

.inspector .empty { font-size: 12.5px; padding: 6px 0; }
.kv { display: grid; grid-template-columns: auto 1fr; gap: 6px 12px; font-size: 12.5px; margin: 8px 0 14px; }
.kv dt { color: var(--text-muted); }
.kv dd { margin: 0; color: var(--text-heading); font-family: var(--mono); font-size: 12px; text-align: right; word-break: break-all; }
.inspector h3 { font-size: 13px; margin: 14px 0 8px; }
.xyz { display: grid; grid-template-columns: 14px 1fr 14px 1fr 14px 1fr; gap: 6px; align-items: center; font-family: var(--mono); font-size: 11px; color: var(--text-muted); margin-bottom: 8px; }
.xyz .input { height: 30px; padding: 0 4px; font-family: var(--mono); font-size: 11.5px; }
.inspector .actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 12px; }
.stat-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 8px; }
.stat { background: var(--surface-a); border: 1px solid var(--border); border-radius: 9px; padding: 8px 10px; }
.stat b { display: block; font-family: var(--display); font-size: 18px; color: var(--text-heading); }
.stat span { font-size: 11px; }
.under { font-size: 12px; color: var(--text-muted); margin-top: 8px; }

.toast {
  position: fixed; bottom: 22px; left: 50%; transform: translateX(-50%); z-index: 50;
  background: var(--foreground); color: #fff; padding: 10px 16px; border-radius: 9px; font-size: 13px; box-shadow: var(--sh-md);
}
.toast.error { background: var(--danger); }

@media (max-width: 1280px) {
  .settings-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .advanced-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .panes { grid-template-columns: 250px minmax(0, 1fr); }
  .inspector { grid-column: 1 / -1; }
}
@media (max-width: 860px) {
  .steps { display: none; }
  .presets { grid-template-columns: 1fr 1fr; }
  .settings-grid, .advanced-grid { grid-template-columns: 1fr 1fr; }
  .panes { grid-template-columns: 1fr; }
  .viewer { height: 60vh; min-height: 380px; }
  .ws-head { flex-direction: column; align-items: stretch; }
}

/* ===================== beginner layer: nav, help, learning center ===================== */
.main-nav { display: flex; gap: 2px; }
.main-nav a { padding: 6px 12px; border-radius: 7px; font-size: 13px; font-weight: 600; color: var(--text-body); text-decoration: none; }
.main-nav a:hover { background: var(--surface-b); color: var(--text-heading); }
.main-nav a.active { background: var(--brand-tint-strong); color: var(--brand-d); }
.help-wrap { position: relative; }
.help-menu { position: absolute; right: 0; top: 40px; min-width: 210px; padding: 6px; display: grid; z-index: 40; box-shadow: var(--sh-md); }
.help-menu a, .help-menu button { text-align: left; padding: 8px 10px; border-radius: 7px; border: 0; background: none; cursor: pointer; font-size: 13px; color: var(--text-heading); text-decoration: none; }
.help-menu a:hover, .help-menu button:hover { background: var(--surface-b); }

.beginner-banner { display: flex; align-items: center; gap: 14px; padding: 14px 16px; margin: 0 0 18px; text-decoration: none; color: var(--text-body); border-color: rgba(91, 82, 232, .3); background: linear-gradient(90deg, var(--brand-tint), var(--card)); }
.beginner-banner:hover { border-color: var(--brand); }
.beginner-banner strong { color: var(--text-heading); }
.beginner-banner > span:nth-child(2) { flex: 1; }
.bb-icon { width: 40px; height: 40px; border-radius: 10px; background: var(--brand); color: #fff; display: grid; place-items: center; flex: none; }

.eyebrow { display: block; font-family: var(--mono); font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: var(--live-ink); }
.badge { display: inline-flex; gap: 6px; align-items: center; font-size: 12px; font-weight: 600; padding: 4px 10px; border-radius: 99px; }
.badge.done { background: var(--scan); color: var(--live-ink); }

.learn { max-width: 1080px; margin: 0 auto; padding: 36px 24px 72px; }
.learn-hero { display: grid; grid-template-columns: 1fr 300px; gap: 28px; align-items: center; }
.learn-hero h1 { font-size: 34px; line-height: 1.15; margin-top: 6px; }
.learn-hero .lede { max-width: 620px; font-size: 16px; margin: 12px 0 20px; }
.hero-stats { padding: 16px; display: grid; gap: 6px; }
.hero-stats b { color: var(--text-heading); font-family: var(--display); }
.progress-line { display: flex; align-items: center; gap: 10px; }
.progress-track { flex: 1; height: 8px; border-radius: 6px; background: var(--surface-b); overflow: hidden; }
.progress-fill { height: 100%; background: var(--live); border-radius: 6px; transition: width .4s var(--ease, ease); }

.lesson-grid { display: grid; gap: 8px; }
.lesson-card { display: grid; grid-template-columns: 34px 1fr auto; gap: 14px; align-items: center; padding: 12px 16px; border-radius: 12px; border: 1px solid var(--border); background: var(--card); text-decoration: none; color: var(--text-body); }
.lesson-card:hover { border-color: var(--brand); }
.lesson-card strong { display: block; color: var(--text-heading); font-size: 14px; }
.lesson-card .muted { font-size: 12.5px; }
.lesson-num { width: 30px; height: 30px; border-radius: 50%; display: grid; place-items: center; border: 1.5px solid var(--border-strong); font-family: var(--mono); font-size: 12px; color: var(--text-heading); }
.lesson-card.done .lesson-num { background: var(--live); border-color: var(--live); color: #fff; }
.mission-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; }
.mission { padding: 14px; display: grid; gap: 6px; align-content: start; }
.mission strong { color: var(--text-heading); }
.mission .muted { font-size: 12.5px; }
.mission .btn { justify-self: start; margin-top: 4px; }
.mission.done { border-color: rgba(8,165,133,.4); }

.crumbs { font-size: 12.5px; margin-bottom: 14px; color: var(--text-muted); }
.crumbs a { color: var(--brand-d); text-decoration: none; font-weight: 600; }
.lesson { max-width: 760px; }
.lesson-head h1 { font-size: 32px; margin-bottom: 6px; }
.lesson-head { margin-bottom: 18px; }
.lesson-body { font-size: 15.5px; line-height: 1.65; color: #3f4555; }
.lesson-body h3 { font-size: 17px; margin: 24px 0 8px; }
.lesson-body li { margin: 4px 0; }
.lesson-body code { font-family: var(--mono); font-size: 13px; background: var(--surface-b); padding: 1px 5px; border-radius: 5px; }
.lesson-body .diagram { display: block; width: 100%; max-width: 620px; margin: 16px 0; background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 8px; color: var(--text-heading); font-family: var(--sans); }
.callout { border-left: 4px solid var(--live); background: var(--scan); padding: 10px 14px; border-radius: 0 10px 10px 0; margin: 16px 0; color: var(--text-heading); }
.callout.warn { border-color: var(--amber); background: rgba(180, 83, 9, .08); }
.lesson-table { border-collapse: collapse; width: 100%; font-size: 14px; margin: 12px 0; background: var(--card); border-radius: 10px; overflow: hidden; }
.lesson-table th, .lesson-table td { border: 1px solid var(--border); padding: 8px 10px; text-align: left; vertical-align: top; }
.lesson-table th { background: var(--surface-b); color: var(--text-heading); font-size: 13px; }
.sw { display: inline-block; width: 11px; height: 11px; border-radius: 3px; margin-right: 6px; vertical-align: -1px; }
.steps-list li { margin: 8px 0; }
.term { border-bottom: 1.5px dotted var(--brand); cursor: help; }
.term-pop { position: absolute; z-index: 60; background: var(--foreground); color: #fff; font-size: 13px; line-height: 1.45; padding: 9px 12px; border-radius: 9px; box-shadow: var(--sh-md); pointer-events: none; }
.help-dot { display: inline-grid; place-items: center; width: 16px; height: 16px; margin-left: 6px; border-radius: 50%; background: var(--brand-tint-strong); color: var(--brand-d); font-size: 10.5px; font-weight: 700; cursor: help; vertical-align: 1px; }

.try-it { display: flex; gap: 16px; align-items: center; justify-content: space-between; padding: 14px 16px; margin: 24px 0; border-color: rgba(8,165,133,.35); }
.quiz { padding: 18px 20px; margin: 24px 0; }
.quiz h2 { font-size: 17px; margin-bottom: 10px; }
.quiz-q { border: 1px solid var(--border); border-radius: 10px; padding: 10px 14px 12px; margin: 0 0 12px; }
.quiz-q legend { font-weight: 600; color: var(--text-heading); padding: 0 4px; font-size: 14px; }
.quiz-opt { display: flex; gap: 9px; align-items: center; padding: 6px 4px; cursor: pointer; font-size: 14px; }
.quiz-opt input { accent-color: var(--brand); }
.quiz-q.right { border-color: var(--live); background: #f6fdfa; }
.quiz-q.wrong { border-color: var(--amber); background: #fffaf3; }
.quiz-why { font-size: 13px; margin-top: 6px; color: var(--text-heading); }
.quiz-result { font-weight: 600; font-size: 13.5px; }
.quiz-result.ok { color: var(--live-ink); }
.quiz-result.warn { color: var(--amber); }
.lesson-nav { display: flex; justify-content: space-between; gap: 12px; margin-top: 8px; flex-wrap: wrap; }
.glossary { display: grid; grid-template-columns: 180px 1fr; gap: 10px 18px; margin-top: 18px; font-size: 14.5px; }
.glossary dt { font-weight: 700; color: var(--text-heading); }
.glossary dd { margin: 0; }

/* mission checklist */
.mission-card { position: fixed; right: 20px; bottom: 20px; width: 320px; z-index: 30; padding: 14px 16px; box-shadow: var(--sh-lg); display: grid; gap: 8px; border-color: rgba(91,82,232,.35); }
.mission-card.pulse { animation: pulse .6s var(--ease, ease); }
.mission-card.finished { border-color: var(--live); }
@keyframes pulse { 40% { transform: scale(1.03); } }
.mission-head { display: flex; justify-content: space-between; align-items: center; }
.mission-card strong { color: var(--text-heading); font-family: var(--display); }
.mission-steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 7px; }
.mission-steps li { display: grid; grid-template-columns: 22px 1fr; gap: 8px; font-size: 12.5px; color: var(--text-muted); }
.mission-steps li.current { color: var(--text-heading); font-weight: 600; }
.mission-steps li.done { color: var(--text-body); text-decoration: line-through; text-decoration-color: rgba(0,0,0,.25); }
.mission-steps .tick { width: 20px; height: 20px; border-radius: 50%; display: grid; place-items: center; font-size: 11px; border: 1.5px solid var(--border-strong); font-family: var(--mono); }
.mission-steps li.current .tick { border-color: var(--brand); color: var(--brand); }
.mission-steps li.done .tick { background: var(--live); border-color: var(--live); color: #fff; }

/* tour */
.tour-shade { position: fixed; inset: 0; z-index: 70; }
.tour-ring { position: fixed; z-index: 71; border-radius: 12px; box-shadow: 0 0 0 3px var(--brand), 0 0 0 9999px rgba(20, 24, 36, .45); pointer-events: none; transition: all .25s var(--ease, ease); }
.tour-bubble { position: fixed; z-index: 72; padding: 14px 16px; box-shadow: var(--sh-lg); }
.tour-bubble h3 { font-size: 16px; margin: 4px 0; }
.tour-bubble p { margin: 0 0 10px; font-size: 13.5px; }

.modal-shade { position: fixed; inset: 0; z-index: 80; background: rgba(20,24,36,.4); display: grid; place-items: center; }
.modal { width: min(460px, 92vw); padding: 16px 18px; }
.shortcuts dt { text-align: left; }
.shortcuts dd { text-align: left; font-family: var(--sans); font-size: 13px; }
kbd { font-family: var(--mono); font-size: 11.5px; background: var(--surface-b); border: 1px solid var(--border-strong); border-bottom-width: 2px; border-radius: 5px; padding: 1px 6px; }

.found { background: var(--surface-a); border: 1px solid var(--border); border-radius: 10px; padding: 10px 12px; margin-bottom: 10px; }
.found h3 { margin: 0 0 6px !important; }
.found ul { margin: 0; padding-left: 18px; font-size: 12.5px; color: var(--text-heading); }
.found p { margin: 8px 0 0; font-size: 12px; }

@media (max-width: 860px) {
  .learn-hero { grid-template-columns: 1fr; }
  .glossary { grid-template-columns: 1fr; }
  .mission-card { left: 12px; right: 12px; width: auto; bottom: 12px; }
  .main-nav a { padding: 6px 8px; }
  .save-state { display: none; }
}

a.btn { text-decoration: none; }
.settings-grid .field > span { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
@media (max-width: 1560px) { .tool kbd { display: none; } .tool { padding: 0 8px; } }

/* ===================== M1: build view ===================== */
.viewer .hint { background: rgba(20, 26, 40, .92); border-color: rgba(255,255,255,.12); color: #dfe4ee; }
.scale-bar { position: absolute; right: 14px; bottom: 12px; z-index: 2; display: flex; flex-direction: column; align-items: flex-end; gap: 3px; color: #c9d1e0; font-family: var(--mono); font-size: 11px; pointer-events: none; }
.scale-bar div { height: 6px; border: 1.5px solid #c9d1e0; border-top: 0; }
.viewer.building .toolbar .tool-group:not(.build-controls) { opacity: .35; pointer-events: none; }

.build-ui { position: absolute; inset: 0; pointer-events: none; z-index: 3; }
.build-ui > * { pointer-events: auto; }
.build-rail { position: absolute; left: 14px; top: 60px; list-style: none; margin: 0; padding: 10px; display: grid; gap: 4px;
  background: rgba(14, 19, 30, .78); border: 1px solid rgba(255,255,255,.08); border-radius: 12px; backdrop-filter: blur(6px); }
.build-rail li { display: grid; grid-template-columns: 24px 1fr; gap: 10px; align-items: center; padding: 6px 10px 6px 4px; border-radius: 8px; color: #7d879b; transition: background .3s, color .3s; }
.build-rail li b { display: block; font-size: 12.5px; font-family: var(--display); font-weight: 600; }
.build-rail li small { display: block; font-size: 11px; opacity: .8; }
.build-rail .dot { width: 22px; height: 22px; border-radius: 50%; display: grid; place-items: center; font-family: var(--mono); font-size: 11px; border: 1.5px solid #3a465c; }
.build-rail li.active { background: rgba(91, 82, 232, .22); color: #fff; }
.build-rail li.active .dot { border-color: #b4aeff; border-top-color: transparent; animation: spin .9s linear infinite; color: transparent; }
.build-rail li.done { color: #c9d1e0; }
.build-rail li.done .dot { background: var(--live); border-color: var(--live); color: transparent; position: relative; }
.build-rail li.done .dot::after { content: '✓'; color: #fff; position: absolute; font-size: 12px; }
.build-caption { position: absolute; left: 50%; bottom: 46px; transform: translateX(-50%); max-width: min(680px, 90%); text-align: center;
  background: rgba(14, 19, 30, .82); border: 1px solid rgba(255,255,255,.1); border-radius: 12px; padding: 12px 18px; color: #fff; backdrop-filter: blur(6px); }
.build-caption b { display: block; font-family: var(--display); font-size: 17px; font-weight: 600; letter-spacing: .01em; }
.build-caption .sub { display: block; font-size: 12.5px; color: #aab4c8; margin-top: 3px; }
.build-caption.flash { animation: capIn .45s var(--ease, ease); }
@keyframes capIn { from { opacity: 0; transform: translate(-50%, 8px); } to { opacity: 1; transform: translate(-50%, 0); } }
.build-controls { position: absolute; right: 12px; top: 12px; }
.build-live { position: absolute; left: 50%; top: 16px; transform: translateX(-50%); display: flex; gap: 8px; align-items: center;
  background: rgba(14,19,30,.85); color: #dfe4ee; border-radius: 99px; padding: 6px 14px; font-size: 12px; }
.build-live .bar { width: 90px; height: 5px; border-radius: 3px; background: rgba(255,255,255,.15); overflow: hidden; }
.build-live .bar i { display: block; height: 100%; width: 0; background: var(--live); transition: width .4s; }
.build-live .pulse { width: 9px; height: 9px; border-radius: 50%; background: var(--live); animation: livePulse 1.2s ease-in-out infinite; }
@keyframes livePulse { 50% { opacity: .25; transform: scale(.7); } }
.ready-card { position: absolute; left: 50%; bottom: 22px; transform: translateX(-50%); z-index: 4; width: min(560px, 92%); padding: 16px 18px;
  box-shadow: 0 24px 60px rgba(0,0,0,.45); animation: capIn .5s var(--ease, ease); }
.ready-card h3 { font-size: 19px; margin: 2px 0 4px; }
.ready-card p { margin: 0 0 12px; font-size: 13px; }
@media (max-width: 860px) {
  .build-rail { top: auto; bottom: 120px; left: 8px; padding: 6px; }
  .build-rail li small { display: none; }
  .build-caption { bottom: 12px; }
}

/* ===================== M2: batch ===================== */
.batch-card { padding: 16px; }
.batch-table { width: 100%; border-collapse: collapse; margin-top: 14px; font-size: 13.5px; }
.batch-table th { text-align: left; font-size: 12px; color: var(--text-muted); font-weight: 600; padding: 6px 10px; border-bottom: 1px solid var(--border); }
.batch-table td { padding: 10px; border-bottom: 1px solid var(--border); vertical-align: middle; }
.batch-table td strong { color: var(--text-heading); }
.pill { display: inline-block; padding: 3px 10px; border-radius: 99px; font-size: 12px; font-weight: 600; background: var(--surface-b); color: var(--text-body); white-space: nowrap; }
.pill.done { background: var(--scan); color: var(--live-ink); }
.pill.running { background: var(--brand-tint-strong); color: var(--brand-d); }
.pill.error { background: var(--danger-tint); color: var(--danger); }

/* ===================== M4: CAD-lite editor ===================== */
.viewer.tool-trim canvas, .viewer.tool-extend canvas, .viewer.tool-offset canvas, .viewer.tool-split canvas,
.viewer.tool-dim canvas, .viewer.tool-text canvas { cursor: crosshair; }
.tool-sep { width: 1px; margin: 4px 3px; background: var(--border); }
.hint .ask { display: grid; gap: 6px; }
.hint .ask label { font-weight: 600; }
.hint .ask .input { height: 30px; }
.hint .ask .row { display: flex; gap: 6px; }
.viewer .hint .ask .input { background: rgba(255,255,255,.08); border-color: rgba(255,255,255,.18); color: #fff; }

.labels { position: absolute; inset: 0; overflow: hidden; pointer-events: none; z-index: 1; }
.cad-label { position: absolute; left: 0; top: 0; white-space: nowrap; font-family: var(--mono); line-height: 1.1;
  transform-origin: 0 0; color: #ffc078; text-shadow: 0 0 3px #0c1019, 0 0 3px #0c1019; }
.cad-label.dimension { color: #f783ac; background: rgba(12, 16, 25, .78); padding: 0 .25em; border-radius: 3px; }
.cad-label.selected { color: #b4aeff; }

.snap-mark { position: absolute; left: 0; top: 0; z-index: 3; pointer-events: none; }
.snap-mark i { position: absolute; left: -7px; top: -7px; width: 14px; height: 14px; border: 2px solid #ffd43b; box-sizing: border-box; }
.snap-mark.mid i { border: 0; width: 0; height: 0; left: -8px; top: -9px; border-left: 8px solid transparent; border-right: 8px solid transparent; border-bottom: 14px solid #ffd43b; }
.snap-mark.int i { border: 0; }
.snap-mark.int i::before, .snap-mark.int i::after { content: ''; position: absolute; left: 6px; top: -2px; width: 2px; height: 18px; background: #ffd43b; transform: rotate(45deg); }
.snap-mark.int i::after { transform: rotate(-45deg); }
.snap-mark.perp i { border-width: 0 0 2px 2px; }
.snap-mark.near i { border-radius: 50% 0; }
.snap-mark.grid i, .snap-mark.ortho i { width: 8px; height: 8px; left: -4px; top: -4px; border-radius: 50%; border-color: #8ce99a; }
.snap-mark span { position: absolute; left: 12px; top: 8px; font: 600 11px var(--sans); color: #ffd43b; white-space: nowrap;
  background: rgba(12, 16, 25, .8); padding: 1px 5px; border-radius: 4px; }
.snap-mark.grid span, .snap-mark.ortho span { color: #8ce99a; }

.sel-box { position: absolute; z-index: 3; pointer-events: none; border: 1.5px solid #4dabf7; background: rgba(77, 171, 247, .12); }
.sel-box.crossing { border: 1.5px dashed #51cf66; background: rgba(81, 207, 102, .12); }

.cad-foot { gap: 6px; flex-wrap: wrap; border-top: 1px solid var(--border); }
.foot-label { font-weight: 600; color: var(--text-heading); margin-right: 2px; }
.snap-btn { height: 24px; padding: 0 8px; border-radius: 6px; border: 1px solid var(--border); background: var(--surface-a);
  font: 600 11px var(--sans); color: var(--text-muted); cursor: pointer; }
.snap-btn:hover:not(:disabled) { border-color: var(--border-strong); color: var(--text-heading); }
.snap-btn.on { background: var(--brand-tint-strong); border-color: var(--brand); color: var(--brand-d); }
.snap-btn:disabled { opacity: .45; cursor: default; }
.grid-step { display: inline-flex; align-items: center; gap: 3px; }
.grid-step .input { width: 52px; height: 24px; padding: 0 6px; font-size: 11px; }
.cad-foot input[type=range] { width: 70px; }

/* ===================== M6: hosted platform ===================== */
.login { max-width: 440px; margin: 64px auto; padding: 0 16px; }
.auth-card { padding: 28px; display: grid; gap: 12px; }
.auth-card h1 { font-size: 26px; }
.auth-card form { display: grid; gap: 12px; }
.auth-card .btn.primary { justify-content: center; height: 40px; }
.auth-error { color: var(--danger); background: var(--danger-tint); border-radius: 8px; padding: 8px 10px; font-size: 13px; }
.auth-switch { font-size: 13px; margin: 0; }
.account-btn { display: inline-flex; gap: 7px; align-items: center; }
.avatar { width: 20px; height: 20px; border-radius: 50%; background: var(--brand); color: #fff; display: grid; place-items: center; font-size: 11px; font-weight: 700; }
.account-menu { right: 0; min-width: 240px; }
.account-head { display: grid; padding: 6px 10px 4px; }
.account-usage { font-size: 11.5px; padding: 0 10px 8px; border-bottom: 1px solid var(--border); margin-bottom: 4px; }

.projects { margin-top: 26px; }
.projects-head { display: flex; justify-content: space-between; align-items: center; gap: 10px; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.chip { height: 30px; padding: 0 12px; border-radius: 999px; border: 1px solid var(--border); background: var(--card); cursor: pointer; font: 600 12.5px var(--sans); color: var(--text-body); }
.chip.active { background: var(--brand); border-color: var(--brand); color: #fff; }
.chip.add { border-style: dashed; color: var(--brand-d); }
.job-list { display: grid; gap: 8px; }
.job-row { display: grid; grid-template-columns: 1fr auto 170px auto auto; gap: 10px; align-items: center; padding: 10px 14px; border-radius: 10px; border: 1px solid var(--border); background: var(--card); }
.job-row .job-name { display: grid; text-decoration: none; color: var(--text-heading); min-width: 0; }
.job-row .job-name span { font-size: 12px; }
.job-row .input.sm { height: 30px; font-size: 12px; }
.badge { font: 600 11px var(--sans); padding: 3px 8px; border-radius: 999px; background: var(--surface-b); color: var(--text-body); }
.badge.done { background: var(--scan); color: var(--live-ink); }
.badge.error { background: var(--danger-tint); color: var(--danger); }
@media (max-width: 760px) { .job-row { grid-template-columns: 1fr auto; } }

.modal-wrap { position: fixed; inset: 0; z-index: 50; background: rgba(20, 24, 36, .45); display: grid; place-items: center; padding: 16px; }
.modal { width: min(520px, 100%); padding: 22px; display: grid; gap: 12px; }
.modal .row { display: flex; gap: 8px; }
.share-count { font-size: 12.5px; }

.view-only { display: inline-block; margin-left: 12px; font: 600 12px var(--sans); color: var(--amber); background: rgba(180, 83, 9, .08); padding: 3px 9px; border-radius: 999px; }
body.readonly #modifyTools, body.readonly [data-tool="draw"], body.readonly [data-tool="move"],
body.readonly #undo, body.readonly #redo, body.readonly section.settings, body.readonly #notes .unit-warning button { display: none; }
body.readonly .tool-group:has(#undo) { display: none; }