:root {
  --ink: #17202a;
  --ink-2: #4a5663;
  --ink-3: #7a8591;
  --line: #dde2e7;
  --line-2: #eef1f4;
  --bg: #f5f7f9;
  --card: #ffffff;
  --accent: #1f5fae;
  --accent-2: #e8f0fa;
  --pass: #1d7a46;
  --pass-bg: #e6f4ec;
  --fail: #b3261e;
  --fail-bg: #fbeaea;
  --warn: #8a5a00;
  --warn-bg: #fff4dc;
  --radius: 8px;
  font: 14px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); min-height: 100vh; display: flex; flex-direction: column; }
h1 { font-size: 22px; margin: 0; }
h2 { font-size: 16px; margin: 0 0 8px; }
h3 { font-size: 14px; margin: 12px 0 4px; }
a { color: var(--accent); }
i { font-style: normal; color: var(--ink-3); font-size: 12px; }
.hint { color: var(--ink-3); font-size: 12.5px; margin: 4px 0; }
.center { text-align: center; }
.num { text-align: right; font-variant-numeric: tabular-nums; }

.top { display: flex; align-items: center; gap: 28px; padding: 0 24px; height: 56px; background: var(--card); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 5; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; color: var(--ink); text-decoration: none; }
.mark { display: inline-grid; place-items: center; width: 28px; height: 28px; border-radius: 6px; background: var(--accent); color: #fff; font-size: 15px; }
.top nav { display: flex; gap: 4px; }
.top nav a { white-space: nowrap; padding: 6px 12px; border-radius: 6px; color: var(--ink-2); text-decoration: none; font-weight: 500; }
.top nav a.on { background: var(--accent-2); color: var(--accent); }
.version { margin-left: auto; color: var(--ink-3); font-size: 12px; }
.pill { display: inline-block; min-width: 18px; padding: 0 6px; border-radius: 9px; background: var(--accent); color: #fff; font-size: 11px; text-align: center; }

.view { flex: 1; width: 100%; max-width: 1240px; margin: 0 auto; padding: 24px; }
.foot { padding: 14px 24px; color: var(--ink-3); font-size: 12px; text-align: center; border-top: 1px solid var(--line); background: var(--card); }

.form-layout { display: grid; grid-template-columns: minmax(0, 1fr) 360px; gap: 24px; align-items: start; }
.form-head { display: flex; justify-content: space-between; align-items: end; gap: 12px; margin-bottom: 16px; flex-wrap: wrap; }
.preset { white-space: nowrap; flex-direction: row !important; align-items: center; gap: 8px !important; color: var(--ink-2); }
fieldset { min-width: 0; border: 1px solid var(--line); border-radius: var(--radius); background: var(--card); margin: 0 0 16px; padding: 14px 18px 16px; }
legend { font-weight: 600; padding: 0 6px; margin-left: -6px; }
.grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px 16px; }
.grid .wide { grid-column: span 2; }
label { min-width: 0; display: flex; flex-direction: column; gap: 4px; font-size: 13px; color: var(--ink-2); }
input[type=checkbox] { width: auto; }
label.check { flex-direction: row; align-items: center; gap: 8px; grid-column: span 2; }
input, select { width: 100%; max-width: 100%; font: inherit; color: var(--ink); padding: 7px 9px; border: 1px solid var(--line); border-radius: 6px; background: #fff; min-width: 0; }
input:focus, select:focus { outline: 2px solid var(--accent-2); border-color: var(--accent); }
input.bad { border-color: var(--fail); background: var(--fail-bg); }
[hidden] { display: none !important; }

.plan-box { display: grid; grid-template-columns: 320px minmax(0, 1fr); gap: 18px; margin-top: 14px; }
#plan { width: 100%; background: #fbfcfd; border: 1px solid var(--line-2); border-radius: 6px; }
.zone-row { display: grid; grid-template-columns: 1.4fr repeat(4, 1fr) auto; gap: 6px; margin-bottom: 6px; }
.zone-row input { padding: 5px 7px; }

button, .button { font: inherit; font-weight: 500; padding: 8px 14px; border-radius: 6px; border: 1px solid var(--line); background: var(--card); color: var(--ink); cursor: pointer; text-decoration: none; display: inline-block; }
button:hover, .button:hover { border-color: var(--ink-3); }
.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.primary:hover { background: #184d8f; }
.primary:disabled { opacity: .55; cursor: default; }
button.link { border: 0; background: none; color: var(--accent); padding: 4px 0; }
button.x { border: 0; background: none; color: var(--ink-3); padding: 2px 6px; font-size: 16px; }

.estimate { position: sticky; top: 76px; }
.estimate-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; }
.estimate .primary { width: 100%; padding: 11px; font-size: 15px; margin-top: 14px; }
.sys { border: 1px solid var(--line-2); border-radius: 6px; padding: 10px 12px; margin-top: 10px; }
.sys.best { border-color: var(--accent); background: #fafcff; }
.sys-head { display: flex; justify-content: space-between; align-items: baseline; font-weight: 600; }
.sys-head small { font-weight: 500; color: var(--ink-3); }
.sys dl { display: grid; grid-template-columns: auto 1fr; gap: 2px 10px; margin: 6px 0 0; font-size: 13px; }
.sys dt { color: var(--ink-3); }
.sys dd { margin: 0; text-align: right; font-variant-numeric: tabular-nums; }
.range { color: var(--ink-3); font-size: 11.5px; }
.tag { display: inline-block; padding: 1px 7px; border-radius: 10px; font-size: 11.5px; font-weight: 600; background: var(--accent-2); color: var(--accent); }
.warn { background: var(--warn-bg); color: var(--warn); border-radius: 6px; padding: 8px 10px; margin-top: 10px; font-size: 12.5px; }
details { margin-top: 12px; font-size: 12.5px; color: var(--ink-2); }
details ul { padding-left: 18px; margin: 6px 0; }
.error { color: var(--fail); }

.page-head { display: flex; justify-content: space-between; align-items: center; gap: 16px; margin-bottom: 18px; flex-wrap: wrap; }
.actions { display: flex; gap: 8px; }
.empty { padding: 40px; text-align: center; color: var(--ink-3); background: var(--card); border: 1px dashed var(--line); border-radius: var(--radius); }
table.list, table.data { width: 100%; border-collapse: collapse; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
table.list th, table.list td, table.data th, table.data td { padding: 9px 12px; border-bottom: 1px solid var(--line-2); text-align: left; }
table.list th, table.data th { font-size: 12px; font-weight: 600; color: var(--ink-3); background: #fafbfc; }
table.list tbody tr { cursor: pointer; }
table.list tbody tr:hover { background: #f8fafc; }
table.data td.num, table.data th.num, table.list td.num, table.list th.num { text-align: right; }
.state { display: inline-block; padding: 2px 9px; border-radius: 10px; font-size: 12px; font-weight: 600; }
.state.queued { background: var(--line-2); color: var(--ink-2); }
.state.running { background: var(--accent-2); color: var(--accent); }
.state.done.pass { background: var(--pass-bg); color: var(--pass); }
.state.done.fail, .state.failed { background: var(--fail-bg); color: var(--fail); }
.state.cancelled { background: var(--line-2); color: var(--ink-3); }

.progress-box { display: flex; gap: 16px; align-items: center; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px; }
.spinner { width: 28px; height: 28px; border: 3px solid var(--accent-2); border-top-color: var(--accent); border-radius: 50%; animation: spin 1s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.error-box { background: var(--fail-bg); border: 1px solid #f1c6c3; border-radius: var(--radius); padding: 16px 20px; }
.error-box pre { white-space: pre-wrap; font-size: 12px; max-height: 300px; overflow: auto; }

.verdict { border-radius: var(--radius); padding: 14px 18px; font-size: 15px; margin-bottom: 14px; }
.verdict.pass { background: var(--pass-bg); color: var(--pass); }
.verdict.fail { background: var(--fail-bg); color: var(--fail); }
.verdict .tip { color: var(--ink-2); font-size: 13px; }
.verdict li { margin-bottom: 6px; }
.verdict ul { margin: 6px 0 0; padding-left: 20px; font-size: 13.5px; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 12px; margin-bottom: 18px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px 14px; }
.card .k { color: var(--ink-3); font-size: 12px; }
.card .v { font-size: 20px; font-weight: 650; margin-top: 2px; font-variant-numeric: tabular-nums; }
.card .s { color: var(--ink-3); font-size: 12px; }

.tabs { display: flex; gap: 2px; border-bottom: 1px solid var(--line); margin-bottom: 16px; overflow-x: auto; }
.tabs button { border: 0; border-bottom: 2px solid transparent; border-radius: 0; background: none; color: var(--ink-2); padding: 9px 14px; white-space: nowrap; }
.tabs button.on { color: var(--accent); border-bottom-color: var(--accent); }
.tab section { margin-bottom: 22px; }
.tab h2 { margin-top: 4px; }
.report { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 8px 28px 24px; overflow-x: auto; }
.report table { border-collapse: collapse; margin: 10px 0; font-size: 12.5px; }
.report th, .report td { border: 1px solid var(--line); padding: 4px 8px; }
.report th { background: #fafbfc; }
.report code { background: var(--line-2); padding: 0 3px; border-radius: 3px; font-size: 12px; }
.report-tools { float: right; margin: 12px 0 0 12px; }
.report pre { background: var(--line-2); padding: 10px; overflow-x: auto; }
.sheet { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); margin-bottom: 18px; overflow: hidden; }
.sheet-head { display: flex; justify-content: space-between; padding: 10px 14px; border-bottom: 1px solid var(--line-2); }
.sheet img { width: 100%; display: block; background: #fff; }
iframe.viewer { width: 100%; height: max(640px, min(88vh, 940px)); border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
.files a { display: flex; justify-content: space-between; padding: 10px 14px; border-bottom: 1px solid var(--line-2); text-decoration: none; color: var(--ink); background: var(--card); }
.files a:hover { background: #f8fafc; }
.files { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }

@media (max-width: 960px) {
  .form-layout { grid-template-columns: minmax(0, 1fr); }
  .estimate { position: static; }
  .plan-box { grid-template-columns: 1fr; }
  .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 560px) {
  .view { padding: 16px; }
  .grid { grid-template-columns: minmax(0, 1fr); }
  .grid .wide, label.check { grid-column: span 1; }
  .form-head { align-items: stretch; flex-direction: column; } .preset select { flex: 1; min-width: 0; }
  .zone-row { grid-template-columns: 1fr 1fr 1fr; }
  .top nav a { padding: 6px 8px; }
  fieldset { padding: 12px; min-width: 0; }
  .top { gap: 12px; padding: 0 16px; }
  .version { display: none; }
}

.who { color: var(--ink-2); font-size: 13px; white-space: nowrap; }
.version + .who { margin-left: 12px; }
.login { max-width: 360px; margin: 60px auto; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; display: flex; flex-direction: column; gap: 14px; }
.login .primary { padding: 10px; }
@media (max-width: 640px) {
  .brand-name { display: none; }
  .top { gap: 10px; }
  .who #who-name { display: none; }
}

#plan .cell { cursor: pointer; }
#plan .cell:hover { stroke: var(--accent); stroke-width: 1.5; }
#paint-target { width: auto; max-width: 100%; padding: 3px 6px; font-size: 12.5px; }
.shape-row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin: 6px 0; font-size: 13px; color: var(--ink-2); }
.shape-row input { width: 80px; padding: 4px 6px; }
.shape-row input.name { width: 110px; }
.shape-row .swatch { width: 12px; height: 12px; border-radius: 3px; display: inline-block; }
.shape-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.plan-legend { display: flex; gap: 12px; flex-wrap: wrap; font-size: 11.5px; color: var(--ink-3); margin-top: 6px; }

#shed-sketch { width: 100%; max-width: 420px; margin-top: 10px; background: #fbfcfd; border: 1px solid var(--line-2); border-radius: 6px; }

/* where the geometry comes from: the grid typed in, or an uploaded plan */
.source-switch { display: inline-flex; border: 1px solid var(--line); border-radius: 8px; background: var(--card); padding: 3px; gap: 3px; margin: -4px 0 16px; }
.source-switch button { border: 0; background: none; padding: 7px 14px; border-radius: 6px; color: var(--ink-2); }
.source-switch button.on { background: var(--accent); color: #fff; }
.upload-row { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.upload-row .hint { flex: 1; min-width: 220px; }
label.upload { flex-direction: row; position: relative; overflow: hidden; color: var(--accent); border-color: var(--accent); font-weight: 600; font-size: 14px; white-space: nowrap; }
label.upload input { position: absolute; inset: 0; opacity: 0; cursor: pointer; }
#drawing-panel { margin-top: 14px; }
.drawing-summary { font-size: 13px; color: var(--ink-2); margin: 10px 0 8px; }
.review { border: 1px solid var(--line-2); border-radius: 6px; background: #fff; max-height: 560px; overflow: auto; }
.review svg { display: block; width: 100%; height: auto; }
.legend-line { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 6px; }
.legend-line .sw { display: inline-block; width: 12px; height: 12px; border-radius: 2px; margin-left: 8px; }
.legend-line .sw:first-child { margin-left: 0; }
.sw.built { background: #dbe7f5; } .sw.opening { background: #f3c77a; } .sw.column { background: #c0392b; }
.legend-line .ring { display: inline-block; width: 12px; height: 12px; border-radius: 50%; border: 2px solid; margin-left: 8px; }
.ring.free { border-color: #d35400; } .ring.edge { border-color: #8e44ad; }
.upper-row { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; font-size: 13px; color: var(--ink-2); margin: 8px 0; }
.upper-row input { width: 70px; } .upper-row select { width: auto; flex: 1; min-width: 200px; }
.note { background: var(--accent-2); color: var(--ink-2); border-radius: 6px; padding: 8px 10px; margin-top: 10px; font-size: 12.5px; }
#drawing-status.error { color: var(--fail); }
.estimate.updating #est-systems, .estimate.updating #est-area { opacity: .45; transition: opacity .2s; }

/* the design code: US (ASCE 7-22, USD) or Bangladesh (BNBC 2020, Taka) */
label.code-choice { flex-direction: row; align-items: center; gap: 10px; margin: -6px 0 14px; font-weight: 600; color: var(--ink); }
label.code-choice select { width: auto; flex: 1; max-width: 520px; font-weight: 500; border-color: var(--accent); }
@media (max-width: 560px) { label.code-choice { flex-direction: column; align-items: stretch; } }

/* Modify a finished design */
.modify-tools { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin: 12px 0; }
.modify-tools input[type=search] { max-width: 300px; }
.modify-tools .grow { flex: 1; min-width: 180px; margin: 0; }
.table-scroll { overflow-x: auto; }
table.modify td { padding: 6px 10px; vertical-align: middle; }
table.modify input.section { min-width: 190px; font-variant-numeric: tabular-nums; }
table.modify .was { margin: 2px 0 0; min-height: 0; }
table.modify tr.changed td { background: var(--warn-bg); }
table.modify .steps { white-space: nowrap; }
table.modify .steps button { padding: 4px 8px; font-size: 12.5px; margin-right: 4px; }
.util-high { color: var(--warn); font-weight: 600; }
.util-over { color: var(--fail); font-weight: 600; }
.modified-from { background: var(--accent-2); color: var(--ink); border-radius: 6px; padding: 10px 14px; margin-bottom: 10px; font-size: 13.5px; }
.modified-from ul { margin: 4px 0 0; }

/* free-form structures */
.freeform { padding: 20px 24px 40px; max-width: 1400px; margin: 0 auto; width: 100%; }
.freeform .form-head { margin-bottom: 10px; }
.ff-intro { max-width: 900px; margin: 10px 0 14px; }
.ff-layout { display: grid; grid-template-columns: minmax(0, 1fr) minmax(320px, 520px); gap: 18px; align-items: start; }
@media (max-width: 980px) { .ff-layout { grid-template-columns: minmax(0, 1fr); } }
.ff-modes { display: flex; flex-wrap: wrap; gap: 4px; border-bottom: 1px solid var(--line); margin-bottom: 14px; }
.ff-modes button { border: 0; border-bottom: 2px solid transparent; border-radius: 0; background: none; padding: 8px 14px; color: var(--ink-2); }
.ff-modes button.on { border-bottom-color: var(--accent); color: var(--accent); }
.ff-templates { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 10px; }
.ff-template { text-align: left; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px 14px; cursor: pointer; font-weight: 400; }
.ff-template:hover, .ff-template.on { border-color: var(--accent); background: var(--accent-2); }
.ff-template strong { display: block; margin-bottom: 2px; }
.ff-template span { color: var(--ink-2); font-size: 13px; }
.ff-words { display: block; }
.ff-words span { display: block; margin-bottom: 6px; color: var(--ink-2); }
.ff-words textarea, .ff-json textarea { width: 100%; font: inherit; padding: 9px; border: 1px solid var(--line); border-radius: 6px; resize: vertical; }
.ff-json textarea { font: 12px/1.45 ui-monospace, Menlo, monospace; }
.ff-examples { display: flex; flex-wrap: wrap; gap: 6px; margin: 8px 0; }
.ff-examples button { font-size: 12.5px; padding: 4px 10px; border-radius: 14px; font-weight: 400; color: var(--ink-2); }
.ff-row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin: 10px 0; }
.ff-units { display: flex; gap: 6px; align-items: center; }
.ff-units select { width: auto; }
.ff-part { border: 1px solid var(--line); border-radius: var(--radius); background: var(--card); margin: 0 0 14px; padding: 12px 16px 14px; }
.ff-part header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.ff-part header h3 { margin: 0; }
.ff-fields { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 8px 18px; }
.ff-field { display: grid; grid-template-columns: minmax(0, 1fr) 84px; gap: 4px 8px; align-items: center; }
.ff-field > span { grid-column: 1 / -1; font-size: 13px; color: var(--ink-2); }
.ff-field > span i { font-style: normal; color: var(--ink-3); }
.ff-field input[type=range] { padding: 0; accent-color: var(--accent); }
.ff-field input[type=number] { padding: 4px 6px; }
.ff-field.wide { grid-template-columns: 1fr; }
.ff-field .vec { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; }
.ff-field textarea { width: 100%; font: 12px ui-monospace, Menlo, monospace; padding: 6px; border: 1px solid var(--line); border-radius: 6px; }
.ff-loads, .ff-json { border: 1px solid var(--line); border-radius: var(--radius); background: var(--card); padding: 10px 16px; margin-bottom: 14px; }
.ff-loads summary, .ff-json summary { cursor: pointer; font-weight: 600; }
.ff-loads .grid { margin-top: 10px; }
.ff-right { position: sticky; top: 72px; }
.ff-preview { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 10px; }
#ff-canvas { width: 100%; height: 420px; display: block; background: #f3f5f8; border-radius: 6px; touch-action: none; cursor: grab; }
.ff-key { display: flex; flex-wrap: wrap; gap: 4px 12px; font-size: 12px; color: var(--ink-2); margin: 8px 2px 0; }
.ff-key i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin-right: 4px; vertical-align: -1px; }
.ff-key i.sup { background: none; width: 0; height: 0; border-left: 5px solid transparent; border-right: 5px solid transparent; border-bottom: 9px solid #15803d; border-radius: 0; }
.ff-notes { margin: 6px 0 0; padding-left: 18px; color: var(--warn); font-size: 13px; }
.ff-design { width: 100%; margin-top: 12px; padding: 11px; font-size: 15px; }
.ff-result { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px 16px; margin-top: 8px; }
.ff-result ul { margin: 4px 0; padding-left: 18px; }
.ff-unsupported { color: var(--warn); }

/* "Any structure": coming soon */
.soon-tag { font-size: 11px; font-weight: 600; letter-spacing: .02em; padding: 1px 6px; margin-left: 4px; border-radius: 999px; background: var(--line); color: var(--ink-2); vertical-align: 1px; }
.source-switch button.on .soon-tag { background: rgba(255, 255, 255, .25); color: #fff; }
.soon-card { max-width: 760px; background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 24px 28px; margin-top: 6px; }
.soon-card h2 { margin: 4px 0 10px; font-size: 20px; }
.soon-card p, .soon-card li { color: var(--ink-2); line-height: 1.55; }
.soon-card ul { padding-left: 20px; margin: 10px 0 0; }
.soon-label { margin: 0; font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: .06em; color: var(--accent); }
@media (max-width: 640px) { .source-switch { flex-wrap: wrap; } .soon-card { padding: 18px; } }