:root {
  --bg: #f4f5f7; --surface: #fff; --surface-2: #f8f9fb; --line: #e2e5ea; --line-2: #cfd4dc;
  --text: #1b1f24; --muted: #5f6873; --faint: #8a939e;
  --accent: #1d4ed8; --accent-2: #e8eefc; --accent-text: #fff;
  --ok: #15803d; --ok-bg: #e7f6ec; --warn: #b45309; --warn-bg: #fdf3e2; --bad: #b91c1c; --bad-bg: #fdecec;
  --member: #27303b; --node: #27303b; --load: #c2410c; --load-2: #0e7490; --support: #4b5563;
  --grid: #e9ecf0; --grid-major: #d6dbe2; --sel: #1d4ed8;
  --diag-pos: rgba(29, 78, 216, .16); --diag-pos-line: #1d4ed8; --diag-neg: rgba(185, 28, 28, .14); --diag-neg-line: #b91c1c;
  --radius: 8px; --shadow: 0 1px 2px rgba(16, 24, 40, .06), 0 1px 3px rgba(16, 24, 40, .08);
  --font: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, "Cascadia Mono", Consolas, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #15181c; --surface: #1d2126; --surface-2: #23282e; --line: #2f353c; --line-2: #3c434b;
    --text: #e6e9ed; --muted: #a2abb5; --faint: #77818c;
    --accent: #6d95ff; --accent-2: #233150; --accent-text: #0b1220;
    --ok: #4ade80; --ok-bg: #173323; --warn: #fbbf24; --warn-bg: #3a2c12; --bad: #f87171; --bad-bg: #3d1b1b;
    --member: #d6dbe1; --node: #d6dbe1; --load: #fb923c; --load-2: #22d3ee; --support: #9aa3ad;
    --grid: #22272d; --grid-major: #2d333a; --sel: #6d95ff;
    --diag-pos: rgba(109, 149, 255, .2); --diag-pos-line: #6d95ff; --diag-neg: rgba(248, 113, 113, .18); --diag-neg-line: #f87171;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body { background: var(--bg); color: var(--text); font: 14px/1.45 var(--font); display: flex; flex-direction: column; }
button, input, select, textarea { font: inherit; color: inherit; }
[hidden] { display: none !important; }

/* Zaglavlje */
.top { display: flex; align-items: center; gap: 12px; padding: 8px 14px; background: var(--surface); border-bottom: 1px solid var(--line); flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 16px; color: var(--accent); text-decoration: none; }
.proj-name { border: 1px solid transparent; background: transparent; padding: 5px 8px; border-radius: 6px; min-width: 120px; max-width: 280px; font-weight: 600; }
.proj-name:hover, .proj-name:focus { border-color: var(--line-2); background: var(--surface-2); outline: none; }
.tabs { display: flex; gap: 2px; background: var(--surface-2); padding: 3px; border-radius: 8px; border: 1px solid var(--line); }
.tabs button { border: 0; background: transparent; padding: 5px 12px; border-radius: 6px; cursor: pointer; color: var(--muted); font-weight: 500; }
.tabs button:hover { color: var(--text); }
.tabs button.on { background: var(--surface); color: var(--text); box-shadow: var(--shadow); }
.tabs button .dot { display: inline-block; width: 7px; height: 7px; border-radius: 50%; margin-left: 6px; vertical-align: 1px; }
.top-actions { margin-left: auto; display: flex; gap: 4px; flex-wrap: wrap; }

.btn { border: 1px solid var(--line-2); background: var(--surface); padding: 6px 12px; border-radius: 6px; cursor: pointer; white-space: nowrap; }
.btn:hover { background: var(--surface-2); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); font-weight: 600; }
.btn.primary:hover { filter: brightness(1.08); }
.btn.ghost { border-color: transparent; background: transparent; }
.btn.ghost:hover { background: var(--surface-2); }
.btn.small { padding: 3px 8px; font-size: 12.5px; }
.btn.danger { color: var(--bad); }
.btn:disabled { opacity: .5; cursor: default; }
.btn-row { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; }
.norm-badge small { color: var(--faint); margin-left: 4px; }
.norm-badge.update::after { content: ""; display: inline-block; width: 7px; height: 7px; background: var(--warn); border-radius: 50%; margin-left: 6px; }

main { flex: 1; min-height: 0; position: relative; }
.view { position: absolute; inset: 0; display: none; }
.view.on { display: flex; }

/* Početna */
#view-home { overflow: auto; justify-content: center; }
.home { max-width: 1060px; width: 100%; padding: 28px 16px 60px; }
.home h1 { font-size: 24px; margin: 0 0 4px; }
.home .lead { color: var(--muted); margin: 0 0 22px; max-width: 70ch; }
.home h2 { font-size: 13px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin: 26px 0 10px; }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 14px; cursor: pointer; text-align: left; display: flex; flex-direction: column; gap: 6px; transition: border-color .12s, box-shadow .12s; }
.card:hover { border-color: var(--accent); box-shadow: var(--shadow); }
.card svg { width: 100%; height: 78px; color: var(--member); }
.card b { font-size: 14.5px; }
.card span { color: var(--muted); font-size: 12.5px; }
.notice { background: var(--warn-bg); border: 1px solid color-mix(in srgb, var(--warn) 30%, transparent); color: var(--text); padding: 10px 14px; border-radius: 8px; font-size: 13px; margin-top: 26px; }
.notice b { color: var(--warn); }

/* Konstrukcija */
#view-frame { flex-direction: row; }
.toolbar { width: 52px; background: var(--surface); border-right: 1px solid var(--line); display: flex; flex-direction: column; gap: 2px; padding: 6px; flex: none; }
.toolbar button { width: 40px; height: 40px; border: 0; border-radius: 8px; background: transparent; cursor: pointer; display: grid; place-items: center; color: var(--muted); }
.toolbar button:hover { background: var(--surface-2); color: var(--text); }
.toolbar button.on { background: var(--accent-2); color: var(--accent); }
.toolbar svg { width: 22px; height: 22px; }
.toolbar hr { width: 28px; border: 0; border-top: 1px solid var(--line); margin: 4px auto; }
.canvas-wrap { flex: 1; min-width: 0; display: flex; flex-direction: column; position: relative; }
.optbar { display: flex; gap: 10px; align-items: center; padding: 6px 10px; background: var(--surface); border-bottom: 1px solid var(--line); flex-wrap: wrap; min-height: 44px; }
.optbar label { display: flex; align-items: center; gap: 5px; color: var(--muted); font-size: 12.5px; }
.optbar input, .optbar select { padding: 4px 6px; border: 1px solid var(--line-2); border-radius: 5px; background: var(--surface); font-size: 13px; }
.optbar input[type=number] { width: 72px; }
.optbar .sep { width: 1px; align-self: stretch; background: var(--line); }
.optbar .grow { flex: 1; }
.seg { display: inline-flex; border: 1px solid var(--line-2); border-radius: 6px; overflow: hidden; }
.seg button { border: 0; background: var(--surface); padding: 4px 10px; cursor: pointer; font-size: 13px; color: var(--muted); border-right: 1px solid var(--line); }
.seg button:last-child { border-right: 0; }
.seg button.on { background: var(--accent); color: var(--accent-text); }
#canvas { flex: 1; width: 100%; min-height: 0; display: block; background: var(--surface-2); touch-action: none; user-select: none; outline: none; }
.statusbar { display: flex; justify-content: space-between; gap: 12px; padding: 3px 10px; font-size: 12px; color: var(--muted); background: var(--surface); border-top: 1px solid var(--line); font-family: var(--mono); }
#hint { font-family: var(--font); }

/* Desni panel */
.panel { width: 360px; flex: none; background: var(--surface); border-left: 1px solid var(--line); overflow: auto; }
.pane { padding: 12px 14px; border-bottom: 1px solid var(--line); }
.pane h3 { margin: 0 0 10px; font-size: 13px; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); display: flex; align-items: center; gap: 8px; }
.pane h3 .grow { flex: 1; }
.pane p { margin: 6px 0; }
.fields { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 10px; }
.fields.one { grid-template-columns: 1fr; }
.field { display: flex; flex-direction: column; gap: 3px; min-width: 0; }
.field.span2 { grid-column: span 2; }
.field > span { font-size: 12px; color: var(--muted); }
.field input, .field select, .field textarea { width: 100%; padding: 6px 8px; border: 1px solid var(--line-2); border-radius: 6px; background: var(--surface); min-width: 0; }
.field input:focus, .field select:focus, .optbar input:focus, .optbar select:focus { outline: 2px solid var(--accent-2); border-color: var(--accent); }
.field small { color: var(--faint); font-size: 11.5px; }
.check { display: flex; align-items: center; gap: 6px; font-size: 13px; }
.muted { color: var(--muted); }
.faint { color: var(--faint); font-size: 12px; }
.mono { font-family: var(--mono); }

table.t { width: 100%; border-collapse: collapse; font-size: 12.5px; }
table.t th, table.t td { text-align: left; padding: 5px 6px; border-bottom: 1px solid var(--line); vertical-align: top; }
table.t th { color: var(--muted); font-weight: 500; font-size: 12px; }
table.t td.num, table.t th.num { text-align: right; font-variant-numeric: tabular-nums; }
table.t tr.click { cursor: pointer; }
table.t tr.click:hover td { background: var(--surface-2); }
table.t tr.sel td { background: var(--accent-2); }
table.t input, table.t select { width: 100%; padding: 3px 5px; border: 1px solid var(--line-2); border-radius: 4px; background: var(--surface); font-size: 12.5px; min-width: 0; }

.util { display: inline-flex; align-items: center; gap: 6px; font-variant-numeric: tabular-nums; font-weight: 600; }
.util .bar { width: 46px; height: 6px; border-radius: 3px; background: var(--line); overflow: hidden; }
.util .bar i { display: block; height: 100%; }
.u-ok { color: var(--ok); } .u-ok .bar i { background: var(--ok); }
.u-warn { color: var(--warn); } .u-warn .bar i { background: var(--warn); }
.u-bad { color: var(--bad); } .u-bad .bar i { background: var(--bad); }
.pill { display: inline-block; padding: 1px 8px; border-radius: 99px; font-size: 12px; font-weight: 600; }
.pill.ok { background: var(--ok-bg); color: var(--ok); } .pill.bad { background: var(--bad-bg); color: var(--bad); } .pill.warn { background: var(--warn-bg); color: var(--warn); }

/* Koraci proračuna */
.steps { font-size: 13px; }
.steps .st-h { font-weight: 600; margin: 12px 0 4px; padding-top: 8px; border-top: 1px solid var(--line); }
.steps .st-h:first-child { border-top: 0; margin-top: 0; padding-top: 0; }
.steps .st { display: grid; grid-template-columns: 1fr auto; gap: 2px 10px; padding: 4px 0; }
.steps .st .l { color: var(--muted); }
.steps .st .fx { grid-column: 1 / -1; font-family: var(--mono); font-size: 11.5px; color: var(--faint); }
.steps .st .v { text-align: right; font-variant-numeric: tabular-nums; }
.steps .st.bad .v, .steps .st.bad .l { color: var(--bad); }
.steps .st.rebar { background: var(--accent-2); border-radius: 6px; padding: 6px 8px; margin: 3px 0; }
.steps .st.rebar .l { color: var(--accent); font-weight: 600; }
.steps .st.rebar .v { text-align: left; grid-column: 1 / -1; font-weight: 600; }

.sizer { display: flex; align-items: center; gap: 6px; }
.sizer .name { flex: 1; text-align: center; font-weight: 600; padding: 5px; border: 1px solid var(--line-2); border-radius: 6px; background: var(--surface-2); }

/* Ploča i temelj — dvostupčani radni prostor */
.work { display: grid; grid-template-columns: 360px 1fr; width: 100%; min-height: 0; }
.work > .side { overflow: auto; background: var(--surface); border-right: 1px solid var(--line); }
.work > .main { overflow: auto; padding: 14px; display: flex; flex-direction: column; gap: 14px; min-width: 0; }
.box { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px 14px; }
.box h3 { margin: 0 0 10px; font-size: 13px; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); display: flex; gap: 8px; align-items: center; }
.box h3 .grow { flex: 1; }
.plan svg { width: 100%; height: auto; max-height: 62vh; display: block; }
.legend { display: flex; align-items: center; gap: 8px; font-size: 12px; color: var(--muted); margin-top: 6px; flex-wrap: wrap; }
.legend .ramp { width: 160px; height: 8px; border-radius: 4px; }
.summary { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 10px; }
.summary .k { background: var(--surface-2); border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px; }
.summary .k span { display: block; font-size: 11.5px; color: var(--muted); }
.summary .k b { font-size: 15px; font-variant-numeric: tabular-nums; }

/* Presjek grede */
.xsec svg { width: 100%; max-width: 320px; display: block; margin: 0 auto; cursor: crosshair; }

/* Dijalog */
dialog { border: 1px solid var(--line); border-radius: 12px; padding: 0; background: var(--surface); color: var(--text); width: min(640px, calc(100vw - 32px)); max-height: calc(100vh - 48px); box-shadow: 0 20px 50px rgba(0,0,0,.25); }
dialog::backdrop { background: rgba(15, 18, 22, .45); }
.dlg-h { display: flex; align-items: center; gap: 10px; padding: 14px 18px; border-bottom: 1px solid var(--line); }
.dlg-h h2 { margin: 0; font-size: 16px; flex: 1; }
.dlg-b { padding: 16px 18px; overflow: auto; max-height: calc(100vh - 190px); }
.dlg-f { display: flex; justify-content: flex-end; gap: 8px; padding: 12px 18px; border-top: 1px solid var(--line); }

#toast { position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%) translateY(20px); background: var(--text); color: var(--bg); padding: 8px 16px; border-radius: 8px; opacity: 0; pointer-events: none; transition: .2s; z-index: 50; font-size: 13.5px; max-width: calc(100vw - 32px); }
#toast.on { opacity: 1; transform: translateX(-50%); }

/* Ispis — elaborat */
.report .paper .cover { min-height: 980px; display: flex; flex-direction: column; gap: 28px; padding-bottom: 20px; }
.report .paper .cover-head { display: flex; gap: 14px; align-items: center; border-bottom: 2px solid #111; padding-bottom: 12px; font-size: 12px; }
.report .paper .cover-head .logo { font-size: 26px; font-weight: 800; letter-spacing: .04em; border: 3px solid #111; padding: 4px 10px; }
.report .paper .cover-title { font-size: 30px; font-weight: 800; text-align: center; letter-spacing: .04em; margin-top: 40px; }
.report .paper .cover-sub { font-size: 16px; text-align: center; color: #333; margin-top: -16px; }
.report .paper .cover-t { border: 0; }
.report .paper .cover-t th, .report .paper .cover-t td { border: 0; border-bottom: 1px solid #ddd; background: none; padding: 7px 4px; font-size: 13px; }
.report .paper .cover-t th { width: 32%; color: #555; font-weight: 500; }
.report .paper .sign { margin-top: 26px; border-top: 1px dotted #888; width: 220px; font-size: 10.5px; color: #777; padding-top: 2px; }
.report .paper .page { border-top: 1px dashed #ccc; padding-top: 18px; margin-top: 18px; }
.report .paper .toc, .report .paper .toc ol { padding-left: 20px; }
.report .paper .toc > li { font-weight: 600; margin: 6px 0; }
.report .paper .toc ol li { font-weight: 400; list-style: none; }
.report .paper h4 { font-size: 12.5px; margin: 14px 0 4px; }
.report .paper p { margin: 6px 0; }
.report .paper .doc-foot { margin-top: 30px; border-top: 1px solid #ccc; padding-top: 6px; font-size: 10.5px; color: #777; }
#view-report .side textarea { resize: vertical; font-size: 13px; line-height: 1.4; }

/* Ispis */
#view-report { overflow: auto; justify-content: center; background: var(--bg); }
.report { width: 100%; max-width: 900px; padding: 20px 16px 60px; }
.report .paper { background: #fff; color: #111; padding: 32px 40px; border-radius: 6px; box-shadow: var(--shadow); font-size: 12.5px; }
.report .paper h1 { font-size: 20px; margin: 0 0 4px; }
.report .paper h2 { font-size: 15px; margin: 24px 0 8px; border-bottom: 2px solid #111; padding-bottom: 3px; }
.report .paper h3 { font-size: 13px; margin: 16px 0 6px; }
.report .paper table { width: 100%; border-collapse: collapse; margin: 6px 0; }
.report .paper th, .report .paper td { border: 1px solid #ccc; padding: 3px 6px; text-align: left; vertical-align: top; }
.report .paper th { background: #f2f2f2; font-weight: 600; }
.report .paper td.num { text-align: right; font-variant-numeric: tabular-nums; }
.report .paper .fig { border: 1px solid #ddd; margin: 8px 0; }
.report .paper .fig svg { width: 100%; height: auto; display: block; }
.report .paper .disc { border: 1px solid #c9a227; background: #fdf8e6; padding: 8px 12px; font-size: 11.5px; margin: 12px 0; }
.report .paper .ok { color: #15803d; font-weight: 600; } .report .paper .bad { color: #b91c1c; font-weight: 600; }
.report .paper .steps .st .fx { color: #555; }
.report .paper .steps .st .l { color: #333; }
.report .paper .steps .st.rebar { background: #eef3ff; }
.report .paper .steps .st.rebar .l { color: #1d4ed8; }
.report-bar { display: flex; gap: 8px; margin-bottom: 12px; align-items: center; flex-wrap: wrap; }

@media print {
  body { background: #fff; }
  .top, .report-bar { display: none !important; }
  main { position: static; }
  .view { position: static; }
  .view:not(#view-report) { display: none !important; }
  #view-report { display: block !important; overflow: visible; }
  .report { max-width: none; padding: 0; }
  .report .paper { box-shadow: none; padding: 0; }
  #view-report .work { display: block; }
  #view-report .side { display: none !important; }
  #view-report .main { padding: 0; overflow: visible; }
  .report .paper .cover { min-height: 0; height: 26cm; break-after: page; }
  .report .paper .page { border: 0; margin: 0; padding: 0; break-before: page; }
  @page { size: A4; margin: 18mm 16mm; }
  h2, h3 { break-after: avoid; }
  .fig, table, .steps .st { break-inside: avoid; }
}

@media (max-width: 980px) {
  .panel { width: 300px; }
  .work { grid-template-columns: 300px 1fr; }
}
@media (max-width: 760px) {
  .top { gap: 8px; }
  .tabs { order: 5; width: 100%; overflow-x: auto; }
  #view-frame { flex-direction: column; }
  .toolbar { width: 100%; flex-direction: row; overflow-x: auto; border-right: 0; border-bottom: 1px solid var(--line); }
  .toolbar hr { display: none; }
  .canvas-wrap { min-height: 55vh; }
  .panel { width: 100%; border-left: 0; border-top: 1px solid var(--line); max-height: none; }
  .view.on { overflow: auto; }
  .work { grid-template-columns: 1fr; }
  .work > .side { border-right: 0; border-bottom: 1px solid var(--line); }
  .report .paper { padding: 18px 16px; }
}