.calc-tabs { display:flex; gap:4px; margin-bottom:18px; background:var(--surface-2); border-radius:var(--radius-sm); padding:4px; }
.calc-tab { flex:1; padding:10px; border:none; background:none; border-radius:10px; font-size:15px; font-weight:600; color:var(--text-3); cursor:pointer; transition:.15s; font-family:var(--font); }
.calc-tab:hover:not(.active) { color:var(--text); }
.calc-tab.active { background:var(--surface); color:var(--text); box-shadow:var(--shadow); }

.calc-panel { display:none; }
.calc-panel.active { display:block; }

/* Fields flow into as many columns as fit — 4 estimate fields sit on one row
   on desktop, the 9 manual fields wrap into 2 rows instead of 5. */
.calc-grid { display:grid; grid-template-columns:repeat(auto-fill, minmax(150px, 1fr)); gap:12px 14px; }
@media(max-width:640px){ .calc-grid { grid-template-columns:1fr 1fr; } }

.calc-field { display:flex; flex-direction:column; gap:5px; }
.calc-field label { font-size:13px; font-weight:600; color:var(--text-2); line-height:1.3; }
.calc-field input { background:var(--surface-2); border:1px solid var(--border); border-radius:var(--radius-sm);
  padding:9px 12px; font-size:16px; color:var(--text); font-family:var(--font);
  transition:border-color .15s, box-shadow .15s; }
.calc-field input:hover:not(:focus) { border-color:var(--text-3); }
.calc-field input:focus { outline:none; border-color:var(--accent); box-shadow:0 0 0 3px rgba(0,122,255,.15); }
.calc-field input::-webkit-outer-spin-button,
.calc-field input::-webkit-inner-spin-button { -webkit-appearance:none; margin:0; }
.calc-field input[type=number] { -moz-appearance:textfield; appearance:textfield; }
.calc-field .hint { font-size:11px; color:var(--text-3); line-height:1.35; }
/* Manual tab: every field carries the same "Optional" hint — the intro already
   says blanks are fine, so hide the repetition to keep the block tight. */
#tab-manual .calc-field .hint { display:none; }

.projector-block { background:var(--surface); border-radius:var(--radius); box-shadow:var(--shadow);
  padding:16px 18px 18px; margin-bottom:12px; border-left:4px solid var(--accent); position:relative;
  transition:box-shadow .2s; }
.projector-block:focus-within { box-shadow:var(--shadow-lg); }
.projector-block .color-swatch { width:16px; height:16px; border-radius:50%; display:inline-block; margin-right:8px; vertical-align:middle; }
.projector-block .remove-btn { position:absolute; top:6px; right:6px; background:none; border:none;
  color:var(--text-3); font-size:20px; cursor:pointer; line-height:1; padding:12px 14px; border-radius:6px; }
.projector-block .remove-btn:hover { background:var(--surface-2); color:var(--red); }
.proj-name-row { display:flex; align-items:center; gap:10px; margin-bottom:12px; }
.proj-name-row input { flex:1; max-width:340px; background:var(--surface-2); border:1px solid var(--border); border-radius:var(--radius-sm);
  padding:7px 12px; font-size:15px; font-weight:600; color:var(--text); font-family:var(--font); }
.proj-name-row input:hover:not(:focus) { border-color:var(--text-3); }
.proj-name-row input:focus { outline:none; border-color:var(--accent); box-shadow:0 0 0 3px rgba(0,122,255,.15); }

.add-btn { display:flex; align-items:center; gap:8px; background:none; border:2px dashed var(--border);
  border-radius:var(--radius); padding:10px 20px; color:var(--text-3); font-size:14px; font-weight:600;
  cursor:pointer; width:100%; justify-content:center; transition:.15s; margin-bottom:16px; }
.add-btn:hover { border-color:var(--accent); color:var(--accent); background:rgba(0,122,255,.04); }
[data-theme="dark"] .add-btn:hover { background:rgba(10,132,255,.10); }
.add-btn:active { transform:scale(.99); }

.chart-wrap { background:var(--surface); border-radius:var(--radius); box-shadow:var(--shadow); padding:24px; margin-top:8px; }
[data-theme="dark"] .chart-wrap { background:#000000; border:1px solid var(--border); }
.chart-toolbar { display:flex; justify-content:space-between; align-items:center; gap:10px; flex-wrap:wrap; margin-bottom:16px; }
.chart-title-mini { font-size:14px; font-weight:700; color:var(--text-3); text-transform:uppercase; letter-spacing:.05em; }
.chart-tools { display:flex; gap:8px; flex-wrap:wrap; }
.chart-tool { background:var(--surface-2); border:1px solid var(--border); border-radius:999px;
  padding:7px 14px; font-size:13px; font-weight:600; color:var(--text-2); cursor:pointer; font-family:var(--font); transition:.15s; white-space:nowrap; }
.chart-tool:hover { background:var(--border); color:var(--text); }
.chart-tool:active { transform:scale(.97); }
.chart-tool.active { background:var(--accent); color:#fff; border-color:var(--accent); }
.chart-canvas-box { position:relative; width:100%; height:440px; }
.chart-canvas-box canvas { position:absolute; inset:0; width:100% !important; height:100% !important; }
.chart-wrap.expanded {
  position:fixed; inset:0; z-index:300; margin:0; border-radius:0; padding:20px 24px;
  display:flex; flex-direction:column;
}
.chart-wrap.expanded .chart-canvas-box { flex:1; height:auto; }
body.no-scroll { overflow:hidden; }
@media (max-width:760px){
  .chart-wrap { padding:16px; }
  .chart-canvas-box { height:320px; }
  .chart-title-mini { display:none; }
  .chart-tools { width:100%; justify-content:space-between; }
  .chart-tool { padding:8px 12px; flex:1; text-align:center; }
}

.calc-actions { display:flex; gap:12px; flex-wrap:wrap; margin:16px 0 8px; }
.btn-secondary { display:inline-flex; align-items:center; gap:6px; background:var(--surface);
  color:var(--text-2); border:1px solid var(--border); padding:11px 22px; border-radius:999px;
  font-size:15px; font-weight:600; cursor:pointer; transition:.15s; font-family:var(--font); }
.btn-secondary:hover { background:var(--surface-2); color:var(--text); }
.btn-secondary:active { transform:scale(.98); }

.section-label { font-size:13px; font-weight:700; color:var(--text-3); text-transform:uppercase;
  letter-spacing:.05em; margin:16px 0 10px; }

.calc-field input.input-invalid { border-color:var(--red); box-shadow:0 0 0 3px rgba(255,59,48,.12); }
.calc-warn { color:var(--red); font-size:13px; font-weight:600; margin-top:12px; }

/* Page-level tightening — this stylesheet loads only on the calculator pages.
   `main` prefix keeps these winning over style.css regardless of load order. */
main .article-hero { padding:32px 0 6px; }
main .article-hero h1 { font-size:30px; letter-spacing:-.02em; }
main .article-hero p { font-size:15px !important; max-width:640px; }