/* ============================================================================
   bpc-system.css — Shared design system for Buried Pipe Calc tools.
   One source of truth for tokens + components. Modelled on the AS2566
   calculator's visual language (that file stays untouched). See
   TOOLS-ARCHITECTURE.md §4. Fonts degrade to system stacks so tools work offline.
   ============================================================================ */

/* ── Design tokens ──────────────────────────────────────────────────────── */
:root{
  --bg:#F1F4F8; --surface:#FFFFFF; --surface2:#E8EDF5; --surface3:#DDE4EF;
  --border:#D0D8E8; --border2:#A8B8CC;
  --accent:#1E60C8; --accent2:#1450A8;
  --pass:#1A7A3A; --warn:#8A6000; --fail:#A01818; --info:#0D7A60; --prefer:#0E5FA6;
  --text:#0D2035; --text2:#3A5068; --text3:#7A90A8;
  --font-ui:'DM Sans',system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  --font-mono:'Space Mono',ui-monospace,'Courier New',monospace;
  --r:5px; --r2:8px;
  --sidebar-w:340px; --results-w:300px;
  /* chart metric palette (shared across charting tools).
     Multi-series sets are validated (dataviz six-checks) per surface. */
  --c-shear:#7A3FB0; --c-depth:#1E60C8; --c-vel:#D97706; --c-froude:#D43030;
  --c-capd:#0E9488; --c-capmax:#0B5F58; --c-capfull:#7C3AED; --c-allow:#7A6000;
  --band-pref:rgba(26,122,58,.16); --band-mand:rgba(180,130,0,.14); --band-fail:rgba(200,40,40,.10);
  /* shared tooltip (bpc-tooltip.js) — dark panel in both themes for contrast */
  --tip-bg:#0D2035; --tip-text:#FFFFFF; --tip-text2:#C8D4E4;
}
html[data-theme="dark"]{
  --bg:#0A1220; --surface:#0F1A2E; --surface2:#162438; --surface3:#1D2E44;
  --border:#253A54; --border2:#304A68;
  --accent:#4A8AE8; --accent2:#6AA4F0;
  --pass:#2AAA50; --warn:#C48000; --fail:#D43030; --info:#20A880; --prefer:#5AA0E8;
  --text:#E8EDF5; --text2:#A8B8CC; --text3:#607080;
  --c-shear:#B78BE0; --c-depth:#3F86E0; --c-vel:#F0A030; --c-froude:#F06060;
  --c-capd:#17A493; --c-capmax:#68D8C8; --c-capfull:#8A6CE8; --c-allow:#B08618;
  --band-pref:rgba(42,170,80,.18); --band-mand:rgba(196,128,0,.16); --band-fail:rgba(212,48,48,.14);
  --tip-bg:#1D2E44; --tip-text:#E8EDF5; --tip-text2:#A8B8CC;
}

/* ── Reset + base ───────────────────────────────────────────────────────── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:14px;background:var(--bg);color:var(--text)}
body{font-family:var(--font-ui);min-height:100vh;display:flex;flex-direction:column;
  -webkit-font-smoothing:antialiased;line-height:1.45}
a{color:var(--accent)}
.mono{font-family:var(--font-mono)}
.muted{color:var(--text3)}
sub{font-size:.72em}
.label{font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.07em;color:var(--text3)}
h1,h2,h3,h4{font-weight:600}

/* ── Header ─────────────────────────────────────────────────────────────── */
#header{display:flex;align-items:center;gap:12px;padding:0 16px;height:48px;flex-shrink:0;
  background:rgba(241,244,248,.97);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);
  position:sticky;top:0;z-index:100}
html[data-theme="dark"] #header{background:rgba(10,18,32,.97)}
.wordmark{display:flex;align-items:center;gap:9px;text-decoration:none;flex-shrink:0}
.wordmark-icon{width:30px;height:30px;background:var(--text);border-radius:6px;
  display:flex;align-items:center;justify-content:center;flex-shrink:0}
.wordmark-text{font-family:var(--font-mono);font-size:14px;font-weight:700;color:var(--text);letter-spacing:-.02em}
.wordmark-sub{font-size:10px;color:var(--text3);font-family:var(--font-mono);letter-spacing:.04em;white-space:nowrap}
.back-link{display:inline-flex;align-items:center;gap:5px;font-size:11px;color:var(--text3);
  text-decoration:none;font-family:var(--font-mono);letter-spacing:.04em;padding:4px 9px;
  border:1px solid var(--border);border-radius:var(--r);white-space:nowrap;transition:all .12s}
.back-link:hover{color:var(--text2);border-color:var(--border2);background:var(--surface2)}
.pipe-badge{font-family:var(--font-mono);font-size:11px;color:var(--text3);background:var(--surface2);
  border:1px solid var(--border);border-radius:var(--r);padding:3px 10px;white-space:nowrap;
  overflow:hidden;text-overflow:ellipsis;max-width:340px}
.spacer{flex:1;min-width:8px}
.status-pill{display:flex;align-items:center;gap:6px;padding:4px 10px;border-radius:20px;
  font-size:11px;font-weight:600;letter-spacing:.04em;background:var(--surface2);border:1px solid var(--border);white-space:nowrap}
.status-dot{width:7px;height:7px;border-radius:50%;background:var(--text3);flex-shrink:0}
.status-dot.pass{background:var(--pass)} .status-dot.warn{background:var(--warn)} .status-dot.fail{background:var(--fail)}
#ver-tag{font-size:10px;color:var(--text3);font-family:var(--font-mono);flex-shrink:0}
.draft-tag{font-size:10px;font-weight:700;letter-spacing:.06em;color:var(--warn);
  border:1px solid color-mix(in srgb,var(--warn) 45%,transparent);border-radius:var(--r);padding:3px 7px;white-space:nowrap}
.hdr-actions{display:flex;gap:5px;flex-shrink:0}
.hdr-btn{height:30px;padding:0 10px;border-radius:var(--r);border:1px solid var(--border);
  background:transparent;font-size:12px;font-family:var(--font-ui);font-weight:500;color:var(--text2);
  cursor:pointer;transition:all .12s;display:flex;align-items:center;gap:5px}
.hdr-btn:hover{background:var(--surface2);color:var(--text);border-color:var(--border2)}
.hdr-btn:active{transform:scale(.97)}

/* ── Three-zone layout ──────────────────────────────────────────────────── */
#layout{display:grid;grid-template-columns:var(--sidebar-w) 1fr var(--results-w);
  flex:1;min-height:0;height:calc(100vh - 48px)}
#sidebar{background:var(--surface2);border-right:1px solid var(--border);overflow-y:auto;
  padding:10px 10px 80px;display:flex;flex-direction:column;gap:8px}
#main{background:var(--bg);overflow-y:auto;display:flex;flex-direction:column}
#results{background:var(--surface);border-left:1px solid var(--border);overflow-y:auto;
  padding:14px 12px;display:flex;flex-direction:column;gap:10px}
#sidebar::-webkit-scrollbar,#results::-webkit-scrollbar{width:3px}
#main::-webkit-scrollbar{width:5px}
#sidebar::-webkit-scrollbar-thumb,#results::-webkit-scrollbar-thumb,#main::-webkit-scrollbar-thumb{background:var(--border2);border-radius:3px}
@media(max-width:980px){
  /* Stack the three zones and reorder so the verdict/results surface first,
     then the inputs, then the charts/detail. min-width:0 stops any child from
     forcing the document wider than the viewport. */
  #layout{grid-template-columns:1fr;height:auto;display:flex;flex-direction:column}
  #sidebar,#main,#results{border:none;max-height:none;min-width:0;width:100%}
  #results{order:1;border-bottom:1px solid var(--border)}
  #sidebar{order:2;border-bottom:1px solid var(--border)}
  #main{order:3}
  #result-cards{display:grid;grid-template-columns:1fr 1fr;gap:8px}
}

/* Phone: trim the header so it fits and the action buttons stay reachable.
   The header must not force the document wider than the viewport. */
@media(max-width:560px){
  #header{gap:8px;padding:0 10px;overflow:hidden}
  .wordmark{min-width:0}
  .wordmark-text{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
  .wordmark-sub,.back-link,.pipe-badge,#ver-tag,.status-pill{display:none}
  .hdr-actions{gap:3px}
  .hdr-btn{padding:0 8px;font-size:12px;gap:3px}
  .hdr-lbl{display:none}
  .hide-narrow{display:none}
  .draft-tag{padding:2px 5px}
  /* Flow-scenario matrix: fixed layout + no spinners so 4 columns fit. */
  .flow-tbl{table-layout:fixed}
  .flow-tbl th:first-child,.flow-tbl td:first-child{width:30%}
  .flow-tbl input{padding:0 5px;font-size:12px;height:36px!important}
  .flow-tbl input::-webkit-inner-spin-button,.flow-tbl input::-webkit-outer-spin-button{display:none}
  /* Larger tap targets for the criteria + flow rows on touch screens. */
  .crit-row{grid-template-columns:18px 1fr 84px 28px}
  .crit-row input[type=number]{height:34px}
  input[type=number],input[type=text],select{height:38px}
}

/* ── Sidebar cards ──────────────────────────────────────────────────────── */
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r2);overflow:hidden}
.card-head{display:flex;align-items:center;gap:8px;padding:9px 12px;cursor:pointer;user-select:none;
  border-bottom:1px solid transparent;transition:background .12s}
.card-head:hover{background:var(--surface2)}
.card-head.open{border-bottom-color:var(--border)}
.card-icon{font-size:14px;flex-shrink:0;width:20px;text-align:center}
.card-title{font-size:13px;font-weight:600;flex:1;color:var(--text)}
.card-badge{font-size:10px;font-family:var(--font-mono);color:var(--text3);background:var(--surface2);
  border:1px solid var(--border);border-radius:4px;padding:1px 6px}
.card-chevron{color:var(--text3);font-size:9px;transition:transform .2s}
.card-head.open .card-chevron{transform:rotate(90deg)}
.card-body{padding:11px 12px;display:flex;flex-direction:column;gap:8px}
.card-body.hidden{display:none}

/* ── Form inputs ────────────────────────────────────────────────────────── */
.field{display:flex;flex-direction:column;gap:3px}
.field label{font-size:11px;font-weight:500;color:var(--text2);display:flex;align-items:center;gap:4px}
.unit{font-size:10px;color:var(--text3);font-family:var(--font-mono)}
.hint{font-size:11px;color:var(--text3);line-height:1.4}
.hint.warn{color:var(--warn)}
.field-row{display:grid;grid-template-columns:1fr 1fr;gap:7px}
.field-row3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:7px}
input[type=number],input[type=text],select{width:100%;height:32px;background:var(--bg);
  border:1px solid var(--border2);border-radius:var(--r);color:var(--text);font-size:13px;
  font-family:var(--font-mono);padding:0 9px;outline:none;transition:border-color .12s,box-shadow .12s;
  appearance:none;-webkit-appearance:none}
input:focus,select:focus{border-color:var(--accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 15%,transparent)}
input[type=number]::-webkit-inner-spin-button{opacity:.3}
select{background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%23808080'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 9px center;padding-right:26px;cursor:pointer}
html[data-theme="dark"] input[type=number],html[data-theme="dark"] input[type=text],html[data-theme="dark"] select{background:var(--surface3)}
input.warnfield{border-color:var(--warn);background:color-mix(in srgb,var(--warn) 8%,var(--surface))}
input.errfield{border-color:var(--fail);background:color-mix(in srgb,var(--fail) 8%,var(--surface))}
.chk{display:flex;align-items:center;gap:6px;font-size:12px;color:var(--text2);cursor:pointer}
.chk input{width:auto;height:auto}

/* ── Toggle groups ──────────────────────────────────────────────────────── */
.toggle-group{display:flex;gap:1px;background:var(--border);border-radius:var(--r);padding:1px}
.toggle-group label{flex:1;text-align:center;padding:5px 6px;border-radius:5px;font-size:12px;
  font-weight:500;cursor:pointer;color:var(--text2);transition:all .12s}
.toggle-group input[type=radio]{display:none}
.toggle-group input[type=radio]:checked+label{background:var(--surface);color:var(--text);font-weight:600;box-shadow:0 1px 2px rgba(0,0,0,.08)}
html[data-theme="dark"] .toggle-group input[type=radio]:checked+label{background:var(--surface2)}

/* ── Buttons ────────────────────────────────────────────────────────────── */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:6px 14px;
  border-radius:var(--r);border:1px solid;font-size:12px;font-weight:500;cursor:pointer;
  transition:all .12s;font-family:var(--font-ui)}
.btn-primary{background:var(--accent);border-color:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent2);border-color:var(--accent2)}
.btn-ghost{background:transparent;border-color:var(--border2);color:var(--text2)}
.btn-ghost:hover{background:var(--surface2);border-color:var(--border);color:var(--text)}
.btn-sm{padding:4px 10px;font-size:11px}
.btn-full{width:100%}

/* ── Page intro (SEO H1 + plain-answer summary above the tool tabs) ─────── */
#page-intro{padding:14px 18px 12px;border-bottom:1px solid var(--border);background:var(--surface)}
#page-intro h1{font-size:15px;font-weight:600;color:var(--text);margin-bottom:4px}
#page-intro p{font-size:11.5px;line-height:1.55;color:var(--text2);max-width:920px}
@media print{#page-intro{display:none}}

/* ── Main tabs ──────────────────────────────────────────────────────────── */
#main-tabs{display:flex;border-bottom:1px solid var(--border);background:var(--surface);flex-wrap:wrap}
.mtab{padding:0 18px;height:44px;line-height:44px;font-size:13px;font-weight:500;cursor:pointer;
  border-bottom:2px solid transparent;color:var(--text3);transition:all .12s;white-space:nowrap;
  user-select:none;background:none;border-top:none;border-left:none;border-right:none;font-family:var(--font-ui)}
.mtab:hover{color:var(--text2);background:var(--surface2)}
.mtab.active{color:var(--accent);border-bottom-color:var(--accent);font-weight:600}
.tab-panel{padding:18px;display:none;flex:1}
.tab-panel.active{display:block}

/* ── Calc blocks (workings chain) ───────────────────────────────────────── */
.calc-block{background:var(--surface);border:1px solid var(--border);border-radius:var(--r2);
  overflow:hidden;border-left:3px solid var(--border);margin-bottom:10px}
.calc-block.pass{border-left-color:var(--pass)} .calc-block.warn{border-left-color:var(--warn)}
.calc-block.fail{border-left-color:var(--fail)} .calc-block.neutral{border-left-color:var(--accent)}
.cb-title{display:flex;align-items:center;gap:8px;padding:9px 14px;border-bottom:1px solid var(--border);background:var(--surface2)}
.cb-title-text{font-size:12px;font-weight:600;color:var(--text);flex:1}
.cb-clause{font-size:10px;font-family:var(--font-mono);color:var(--text3)}
.cb-status{font-size:10px;font-weight:700;letter-spacing:.06em;padding:2px 8px;border-radius:20px;white-space:nowrap}
.cb-status.pass{background:color-mix(in srgb,var(--pass) 12%,transparent);color:var(--pass)}
.cb-status.warn{background:color-mix(in srgb,var(--warn) 12%,transparent);color:var(--warn)}
.cb-status.fail{background:color-mix(in srgb,var(--fail) 12%,transparent);color:var(--fail)}
.cb-status.neutral{background:color-mix(in srgb,var(--accent) 12%,transparent);color:var(--accent)}
.calc-eq{font-family:var(--font-mono);font-size:12px;line-height:1.8;padding:10px 14px;color:var(--text2);
  background:var(--surface);white-space:pre-wrap;overflow-x:auto}
html[data-theme="light"] .calc-eq{color:#3A3028;background:#FDFCF9}

/* ── Result cards (results rail) ────────────────────────────────────────── */
.result-card{background:var(--surface2);border:1px solid var(--border);border-radius:var(--r2);
  padding:10px 12px;border-left:3px solid var(--border)}
.result-card.pass{border-left-color:var(--pass);background:color-mix(in srgb,var(--pass) 4%,var(--surface))}
.result-card.warn{border-left-color:var(--warn);background:color-mix(in srgb,var(--warn) 4%,var(--surface))}
.result-card.fail{border-left-color:var(--fail);background:color-mix(in srgb,var(--fail) 4%,var(--surface))}
.result-card.na{border-left-color:var(--border);opacity:.65}
.rc-head{display:flex;align-items:flex-start;justify-content:space-between;gap:8px;margin-bottom:4px}
.rc-label{font-size:10px;font-weight:600;text-transform:uppercase;letter-spacing:.06em;color:var(--text3)}
.rc-value{font-size:17px;font-weight:700;font-family:var(--font-mono);color:var(--text)}
.rc-value small{font-size:10px;font-weight:400;color:var(--text3)}
.rc-status{font-size:9px;font-weight:700;padding:2px 7px;border-radius:20px;letter-spacing:.05em}
.rc-status.pass{background:color-mix(in srgb,var(--pass) 14%,transparent);color:var(--pass)}
.rc-status.warn{background:color-mix(in srgb,var(--warn) 16%,transparent);color:var(--warn)}
.rc-status.fail{background:color-mix(in srgb,var(--fail) 14%,transparent);color:var(--fail)}
.rc-status.prefer{background:color-mix(in srgb,var(--pass) 22%,transparent);color:var(--pass)}

/* ── Tags / status chips ────────────────────────────────────────────────── */
.tag{font-size:9px;font-weight:700;padding:1px 6px;border-radius:8px;text-transform:uppercase;letter-spacing:.04em;white-space:nowrap}
.tag.pass{background:color-mix(in srgb,var(--pass) 16%,transparent);color:var(--pass)}
.tag.prefer{background:color-mix(in srgb,var(--pass) 24%,transparent);color:var(--pass)}
.tag.warn{background:color-mix(in srgb,var(--warn) 18%,transparent);color:var(--warn)}
.tag.fail{background:color-mix(in srgb,var(--fail) 16%,transparent);color:var(--fail)}
.tag.na{background:var(--surface3);color:var(--text3)}
.tag.review{background:color-mix(in srgb,var(--fail) 12%,transparent);color:var(--fail)}
.status-chip{font-size:9px;font-weight:700;letter-spacing:.05em;text-transform:uppercase;padding:2px 6px;border-radius:10px}
.st-published{background:color-mix(in srgb,var(--pass) 18%,transparent);color:var(--pass)}
.st-partial{background:color-mix(in srgb,var(--prefer) 18%,transparent);color:var(--prefer)}
.st-advisory{background:color-mix(in srgb,var(--warn) 18%,transparent);color:var(--warn)}
.st-licensed{background:color-mix(in srgb,var(--fail) 15%,transparent);color:var(--fail)}
.st-custom{background:var(--surface3);color:var(--text2)}
.st-modified{background:color-mix(in srgb,var(--warn) 22%,transparent);color:var(--warn)}

/* ── Tables ─────────────────────────────────────────────────────────────── */
table.data{width:100%;border-collapse:collapse;font-size:11px}
table.data th,table.data td{border:1px solid var(--border);padding:5px 7px;text-align:left;vertical-align:top}
table.data th{background:var(--surface2);font-weight:600;font-size:10px;text-transform:uppercase;letter-spacing:.04em;color:var(--text2)}
table.data td.num{font-family:var(--font-mono);text-align:right}
.scroller{overflow-x:auto;border:1px solid var(--border);border-radius:var(--r)}

/* ── Panels / disclaimers / warnings ────────────────────────────────────── */
.panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--r2);padding:16px;margin-bottom:14px}
.panel h3{font-size:12px;color:var(--text);margin-bottom:8px}
.disclaimer{background:var(--surface);border:1px solid var(--border);border-left:3px solid var(--warn);
  border-radius:var(--r);padding:10px 14px;font-size:12px;color:var(--text2);margin-bottom:12px}
.disclaimer strong{color:var(--text)}
.callout{background:color-mix(in srgb,var(--accent) 8%,var(--surface));
  border:1px solid color-mix(in srgb,var(--accent) 30%,var(--border));border-radius:var(--r);
  padding:8px 12px;font-size:12px;color:var(--text);margin-bottom:12px}
.warnbox{background:color-mix(in srgb,var(--fail) 8%,var(--surface));
  border:1px solid color-mix(in srgb,var(--fail) 35%,transparent);border-radius:var(--r);
  padding:10px 12px;font-size:12px;margin-bottom:10px}
.warnbox h4{color:var(--fail);font-size:11px;text-transform:uppercase;letter-spacing:.05em;margin-bottom:4px}
.warnbox.o{background:color-mix(in srgb,var(--warn) 8%,var(--surface));border-color:color-mix(in srgb,var(--warn) 35%,transparent)}
.warnbox.o h4{color:var(--warn)}
.warnbox ul{margin-left:16px}
.subst{font-family:var(--font-mono);font-size:11px;background:var(--surface2);border:1px solid var(--border);
  border-radius:var(--r);padding:8px 10px;margin:4px 0;white-space:pre-wrap;line-height:1.6;overflow-x:auto}

/* ── Criteria rows ──────────────────────────────────────────────────────── */
.crit-row{display:grid;grid-template-columns:16px 1fr 76px 34px;gap:6px;align-items:center;margin-bottom:5px;font-size:11px}
.crit-row .cmp{color:var(--text3);text-align:center;font-family:var(--font-mono)}
.crit-row input[type=number]{height:26px;padding:0 6px;font-size:12px}
.crit-row.disabled{opacity:.4}

/* ── Charts ─────────────────────────────────────────────────────────────── */
.chartcard{background:var(--surface);border:1px solid var(--border);border-radius:var(--r2);padding:0;margin-bottom:14px;overflow:hidden}
.chartcard h3{font-size:12px;color:var(--text);margin-bottom:2px}
.chartcard .chsub{font-size:11px;color:var(--text3);margin-bottom:8px}
/* Collapsible chart-card header (same interaction as sidebar cards) */
.cc-head{display:flex;align-items:center;gap:8px;padding:10px 14px;cursor:pointer;user-select:none;transition:background .12s}
.cc-head:hover{background:var(--surface2)}
.cc-head h3{flex:1;margin:0}
.cc-head.open{border-bottom:1px solid var(--border)}
.cc-body{padding:10px 14px 12px}
.cc-body.hidden{display:none}
/* Answer row: grade-window strip + pipe cross-section, always visible */
#answer-row{display:grid;grid-template-columns:1fr 240px;gap:14px;margin-bottom:14px;align-items:stretch}
#answer-row .panel{margin-bottom:0}
@media(max-width:760px){#answer-row{grid-template-columns:1fr}}
#strip-note{margin-top:6px}
#xsec-panel svg{display:block;margin:0 auto;max-width:220px;width:100%;height:auto}
/* Metric small multiples: 2×2, single column on phones */
#mini-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media(max-width:620px){#mini-grid{grid-template-columns:1fr}}
.mini h4{font-size:11px;font-weight:600;color:var(--text);margin:0 0 2px}
.mini .hint{margin-bottom:2px}
/* Band key (grade-band shading legend) */
.bandkey{display:flex;flex-wrap:wrap;gap:12px;font-size:10px;color:var(--text2);margin:0 0 6px}
.bandkey .bk{width:12px;height:10px;border-radius:2px;display:inline-block;margin-right:4px;vertical-align:-1px;border:1px solid var(--border)}
.chartwrap{position:relative;width:100%;overflow-x:auto}
svg.chart{width:100%;height:auto;display:block;touch-action:pan-y}
.legend{display:flex;flex-wrap:wrap;gap:10px;margin-top:8px;font-size:11px}
.legend .li{display:flex;align-items:center;gap:5px;cursor:pointer;user-select:none;padding:2px 4px;border-radius:3px}
.legend .li:hover{background:var(--surface2)}
.legend .li.off{opacity:.35;text-decoration:line-through}
.legend .sw{width:14px;height:3px;border-radius:2px;flex-shrink:0}
.legend .sw.dash{background-image:repeating-linear-gradient(90deg,currentColor 0 4px,transparent 4px 7px)}
.metric-toggles{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:8px}
.mtoggle{font-size:10px;padding:3px 8px;border:1px solid var(--border);border-radius:12px;cursor:pointer;color:var(--text2);background:var(--surface)}
.mtoggle.on{border-color:var(--accent);color:var(--accent);font-weight:600}
#chart-tooltip{position:fixed;pointer-events:none;background:var(--surface);border:1px solid var(--border2);
  border-radius:var(--r);padding:8px 10px;font-size:11px;box-shadow:0 4px 16px rgba(0,0,0,.18);z-index:200;
  display:none;font-family:var(--font-mono);min-width:180px}
#chart-tooltip .tt-grade{font-weight:700;margin-bottom:4px;border-bottom:1px solid var(--border);padding-bottom:3px}
#chart-tooltip .tt-row{display:flex;justify-content:space-between;gap:12px}

/* ── Worked-example box (profile card) ──────────────────────────────────── */
#example-box{border:1px solid var(--border);border-radius:var(--r);padding:8px 10px;
  background:var(--surface2);display:flex;flex-direction:column;gap:5px}
#example-box .ex-head{font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--text3)}
#example-box .ex-head .muted{text-transform:none;letter-spacing:0;font-weight:600;color:var(--text2);font-size:11px}
#example-box .ex-actions{display:flex;gap:6px;flex-wrap:wrap;margin-top:2px}

/* ── Preset banner / modified banner ────────────────────────────────────── */
#preset-banner{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
#modified-banner{display:none;background:color-mix(in srgb,var(--warn) 12%,var(--surface));
  border:1px solid color-mix(in srgb,var(--warn) 40%,transparent);border-radius:var(--r);
  padding:8px 10px;font-size:11px;color:var(--text)}
#modified-banner.show{display:block}
#modified-banner ul{margin:4px 0 6px 16px}

/* ── Subscribe strip (email capture above the footer) ───────────────────── */
#subscribe-bar{display:flex;align-items:center;justify-content:center;gap:10px;flex-wrap:wrap;
  padding:12px 16px;border-top:1px solid var(--border);background:var(--surface2);font-size:12px;color:var(--text2)}
#subscribe-bar form{display:flex;gap:6px;flex-wrap:wrap}
#subscribe-bar input[type=email]{width:220px;height:30px}
#subscribe-bar button{height:30px}
@media print{#subscribe-bar{display:none!important}}

/* ── Footer ─────────────────────────────────────────────────────────────── */
#footer-bar{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:8px;
  padding:10px 16px;border-top:1px solid var(--border);font-size:11px;color:var(--text2);background:var(--surface)}
#footer-bar a{color:var(--accent);text-decoration:none;margin-left:12px}
#footer-bar .footer-reading{flex-basis:100%;color:var(--text3)}

/* ── Readout grid (stat tiles) ──────────────────────────────────────────── */
.readout{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:8px;margin-bottom:14px}
.stat{background:var(--surface2);border:1px solid var(--border);border-radius:var(--r);padding:8px 10px}
.stat .k{font-size:10px;color:var(--text3);text-transform:uppercase;letter-spacing:.05em}
.stat .v{font-size:16px;font-weight:700;font-family:var(--font-mono);margin-top:2px}
.stat .v small{font-size:10px;font-weight:400;color:var(--text3)}
.stat.pass{border-left:3px solid var(--pass)} .stat.prefer{border-left:3px solid var(--pass)}
.stat.warn{border-left:3px solid var(--warn)} .stat.fail{border-left:3px solid var(--fail)}

/* ── Print ──────────────────────────────────────────────────────────────── */
@media print{
  #header,.back-link,.draft-tag,.hdr-actions,#main-tabs,.mtoggle,.legend .li,#chart-tooltip,button{display:none!important}
  .cc-body.hidden{display:block!important}
  #layout{display:block;height:auto}
  #sidebar,#main,#results{overflow:visible;border:none}
  #sidebar{border-bottom:1px solid #ccc}
  .tab-panel{display:block!important;page-break-inside:avoid}
  body{background:#fff;color:#000}
  .card,.panel,.chartcard,.calc-block,.result-card{box-shadow:none}
}

/* ── Tools dropdown (tool-page headers; theme-aware via tokens) ─────────── */
.nav-tools{position:relative;display:inline-flex}
.nav-tools::after{content:'';position:absolute;top:100%;left:-8px;right:-8px;height:12px}
.nav-tools .nt-car{font-size:9px;transition:transform .15s}
.nav-tools:hover .nt-car,.nav-tools.open .nt-car{transform:rotate(180deg)}
.nav-tools-menu{position:absolute;top:calc(100% + 10px);left:0;background:var(--surface);border:1px solid var(--border);border-radius:10px;box-shadow:0 14px 40px rgba(13,32,53,.18);list-style:none;padding:8px;margin:0;width:308px;display:none;z-index:400}
.nav-tools:hover .nav-tools-menu,.nav-tools.open .nav-tools-menu,.nav-tools:focus-within .nav-tools-menu{display:block}
.nav-tools-menu li{margin:0}
.nt-head{font-family:var(--font-mono,monospace);font-size:9px;letter-spacing:.12em;text-transform:uppercase;color:var(--text3);padding:4px 10px 8px}
.nav-tools-menu a{display:flex;align-items:flex-start;gap:10px;padding:9px 10px;border-radius:7px;text-decoration:none;margin-left:0}
.nav-tools-menu a:hover{background:var(--surface2)}
.nt-ico{flex:none;width:28px;height:28px;border-radius:7px;background:var(--surface2);color:var(--accent);display:flex;align-items:center;justify-content:center;margin-top:1px}
.nav-tools-menu a:hover .nt-ico{background:var(--surface)}
.nt-t{display:block;font-size:13px;font-weight:600;color:var(--text);line-height:1.3}
.nt-d{display:block;font-size:11px;font-weight:400;color:var(--text3);line-height:1.45;margin-top:2px}
.nav-tools-menu a[aria-current="page"]{opacity:.55;pointer-events:none}