/* ExactUtility light/dark theme layer — Stage 3 v7 */
:root{color-scheme:light}
.theme-toggle{height:36px;display:inline-flex;align-items:center;justify-content:center;gap:7px;border:1px solid var(--border);border-radius:10px;background:var(--surface);color:var(--ink);padding:0 11px;font:700 12px Inter,sans-serif;cursor:pointer;white-space:nowrap;transition:background .16s ease,border-color .16s ease,color .16s ease,transform .16s ease}
.theme-toggle:hover{border-color:#aec5c3;transform:translateY(-1px)}
.theme-icon{font-size:15px;line-height:1}.hero-brand-line{font-weight:800;color:var(--brand);margin-right:.25em}

html[data-theme="dark"]{
  color-scheme:dark;
  --brand:#63d6ab;--brand-strong:#75dfb8;--brand-deep:#46bd94;--brand-soft:#123b35;
  --ink:#f1f7f5;--muted:#a9b9bc;--canvas:#07141c;--surface:#0d1c25;--border:#263a43;
  --blue-soft:#11293a;--grey-soft:#101e27;--success:#72d7b4;--warning:#efb56e;--danger:#ff8f8f;
  --shadow:0 12px 34px rgba(0,0,0,.25)
}
html[data-theme="dark"] body{background:var(--canvas);color:var(--ink)}
html[data-theme="dark"] .site-header{background:rgba(6,18,26,.94);border-bottom-color:#263741}
html[data-theme="dark"] .brand-mark{background:#113237;color:#63d6ab}
html[data-theme="dark"] .nav-links a:hover,html[data-theme="dark"] .link{color:#69dcb3}
html[data-theme="dark"] .nav-search input,html[data-theme="dark"] .hero-search input,html[data-theme="dark"] .field input,html[data-theme="dark"] .field select,html[data-theme="dark"] .input-wrap input,html[data-theme="dark"] .input-wrap select{background:#0d1b24;color:#eef7f5;border-color:#31434c}
html[data-theme="dark"] input::placeholder{color:#7f9197}
html[data-theme="dark"] .nav-search span{color:#9fb0b4}
html[data-theme="dark"] .theme-toggle{background:#10212a;border-color:#31434c;color:#e8f3f1}
html[data-theme="dark"] .theme-toggle:hover{border-color:#4a625f;background:#132831}

html[data-theme="dark"] .hero{background:radial-gradient(circle at 58% 20%,rgba(12,83,77,.26) 0,rgba(7,42,47,.22) 27%,transparent 58%),linear-gradient(180deg,#07151e,#081821)}
html[data-theme="dark"] .hero p{color:#c5d2d3}
html[data-theme="dark"] .hero-brand-line{color:#7ce0b9}
html[data-theme="dark"] .hero-search input{box-shadow:0 8px 28px rgba(0,0,0,.22)}
html[data-theme="dark"] .chip{background:#0d1b24;border-color:#2b3f49;color:#c0ced0}
html[data-theme="dark"] .chip:hover{border-color:#4d756b;color:#73deb6}
html[data-theme="dark"] .visual-card{background:#10212a;border-color:#33464f;box-shadow:0 14px 34px rgba(0,0,0,.3)}
html[data-theme="dark"] .calc-screen{background:#283a3d}
html[data-theme="dark"] .calc-grid span{background:#10191e;border:1px solid #34464d}
html[data-theme="dark"] .print-visual{background:linear-gradient(135deg,#132d3a,#163b3a 48%,#163149)}
html[data-theme="dark"] .print-visual:after{background:#0c1d24;color:#78dfb7;box-shadow:0 8px 24px rgba(0,0,0,.3)}
html[data-theme="dark"] .ruler{border-color:#677a7f;background:repeating-linear-gradient(90deg,transparent 0 9px,#71858a 10px 11px)}

html[data-theme="dark"] .section{background:#081821}
html[data-theme="dark"] .home-page .section.alt{background:#0a1720}
html[data-theme="dark"] .section-head p{color:var(--muted)}
html[data-theme="dark"] .tool-card,html[data-theme="dark"] .category-card,html[data-theme="dark"] .intent-card,html[data-theme="dark"] .intent-guide-card,html[data-theme="dark"] .info-card,html[data-theme="dark"] .related-card,html[data-theme="dark"] .cluster-link,html[data-theme="dark"] .answer-stat{background:#0f2029;border-color:#2a3d47;color:var(--ink)}
html[data-theme="dark"] .tool-card:hover,html[data-theme="dark"] .category-card:hover,html[data-theme="dark"] .intent-guide-card:hover{border-color:#46625d;box-shadow:0 12px 32px rgba(0,0,0,.28)}
html[data-theme="dark"] .tool-card p,html[data-theme="dark"] .category-card p,html[data-theme="dark"] .intent-guide-card p,html[data-theme="dark"] .info-card p{color:var(--muted)}
html[data-theme="dark"] .tool-icon{background:#163b35;color:#79deb8}
html[data-theme="dark"] .category-card{background:linear-gradient(180deg,#102029,#0d1d25)}
html[data-theme="dark"] .category-card:nth-child(1){background:linear-gradient(145deg,#292615,#171f23)}
html[data-theme="dark"] .category-card:nth-child(2){background:linear-gradient(145deg,#153125,#112128)}
html[data-theme="dark"] .category-card:nth-child(3){background:linear-gradient(145deg,#142a3f,#111f2a)}
html[data-theme="dark"] .category-card:nth-child(4){background:linear-gradient(145deg,#103036,#102029)}
html[data-theme="dark"] .category-card:nth-child(5){background:linear-gradient(145deg,#142a3c,#111f29)}
html[data-theme="dark"] .category-card:nth-child(6){background:linear-gradient(145deg,#2b2033,#15202a)}
html[data-theme="dark"] .requirement-banner{background:linear-gradient(135deg,#092f34,#0a4b51);border:1px solid #24575a}
html[data-theme="dark"] .req-pill{background:rgba(255,255,255,.04);border-color:#335c5e}

html[data-theme="dark"] .breadcrumb,html[data-theme="dark"] .lede{color:var(--muted)}
html[data-theme="dark"] .calc-panel{background:#0d1b24;border-color:#293d47;box-shadow:0 12px 36px rgba(0,0,0,.24)}
html[data-theme="dark"] .input-pane{background:#0d1b24}
html[data-theme="dark"] .result-pane{background:linear-gradient(145deg,#102c2c,#0d2028)}
html[data-theme="dark"] .input-wrap .unit{background:#13242c;color:#b5c5c8;border-color:#31434c}
html[data-theme="dark"] .secondary-btn{background:#10212a;color:#76ddb6;border-color:#36514e}
html[data-theme="dark"] .result-main .label,html[data-theme="dark"] .formula{color:#b8c7ca}
html[data-theme="dark"] .result-grid{border-color:#35504e}
html[data-theme="dark"] .result-item:nth-child(odd),html[data-theme="dark"] .result-item:nth-child(-n+2){border-color:#35504e}
html[data-theme="dark"] .result-item small{color:#a9b9bc}
html[data-theme="dark"] .smart-strip{background:#102c2b;border-color:#28524d}
html[data-theme="dark"] .preset{background:#10212a;border-color:#31434c;color:#d7e4e2}
html[data-theme="dark"] .preset.active{background:#153d36;border-color:#41776a;color:#86e2bd}
html[data-theme="dark"] .data-table th{background:#10212a;color:#aebfc1}
html[data-theme="dark"] .data-table td{border-color:#263941}
html[data-theme="dark"] .data-table tr.highlight td{background:#11322f;color:#8ce4c1}
html[data-theme="dark"] .upload-box{background:#0d1d25;border-color:#30434c}
html[data-theme="dark"] .privacy-note{background:#102927;border-color:#28504c;color:#b4c4c5}
html[data-theme="dark"] .quick-answer{background:linear-gradient(145deg,#102d2c,#0d2028);border-color:#2c4d49}
html[data-theme="dark"] .trust-note{background:#102826;color:#b6c6c7}
html[data-theme="dark"] .source-list{color:#b4c4c6}
html[data-theme="dark"] .guide-filter a{background:#10212a;border-color:#31434c}
html[data-theme="dark"] .stage3-badge{background:#152d3d;color:#9ccbea}
html[data-theme="dark"] .ad-slot-stage3{background:#0c1a22;border-color:#314149;color:#84959a}
html[data-theme="dark"] .compare-pane{background:#0d1b24!important;border-color:#2c4049!important}
html[data-theme="dark"] .compare-stage{background:linear-gradient(180deg,#0a151c,#102029)!important}

html[data-theme="dark"] .footer{background:#061119;border-top:1px solid #20343c}
html[data-theme="dark"] .footer-bottom{border-color:#22343c}
html[data-theme="dark"] .skip-link{background:#10212a;color:#8ae3c0;border-color:#63d6ab}

@media(max-width:980px){.theme-toggle{margin-left:auto}.menu-btn{margin-left:0}}
@media(max-width:640px){.theme-label{display:none}.theme-toggle{width:38px;padding:0}.theme-toggle{height:36px}.hero-brand-line{display:block;margin:0 0 3px}}

/* Preserve the homepage icon color language in dark mode. */
html[data-theme="dark"] .popular-card .icon-clock{background:#12382f;color:#6fddb2}
html[data-theme="dark"] .popular-card .icon-percent{background:#172a4a;color:#80a8ff}
html[data-theme="dark"] .popular-card .icon-pay{background:#113638;color:#70d8cf}
html[data-theme="dark"] .popular-card .icon-dpi{background:#172d43;color:#82b7ec}
html[data-theme="dark"] .popular-card .icon-calendar{background:#2a2042;color:#b99af0}
html[data-theme="dark"] .popular-card .icon-image{background:#16372f;color:#78d9bc}
html[data-theme="dark"] .popular-card .icon-area{background:#3a281b;color:#efaa65}
html[data-theme="dark"] .popular-card .icon-growth{background:#182d4a;color:#89aef5}
html[data-theme="dark"] .home-category-grid .icon-date{background:#372e18;color:#e7be61}
html[data-theme="dark"] .home-category-grid .icon-finance{background:#17372a;color:#81d9a4}
html[data-theme="dark"] .home-category-grid .icon-health{background:#182f4a;color:#8cb8f0}
html[data-theme="dark"] .home-category-grid .icon-math{background:#12363b;color:#74d1d8}
html[data-theme="dark"] .home-category-grid .icon-measure{background:#172f45;color:#8bb9e4}
html[data-theme="dark"] .home-category-grid .icon-print{background:#2b2341;color:#bca1e8}

/* Stage 3 v8 — theme-specific rich hero art */
html[data-theme="dark"] .home-page .hero-utility-art-light{display:none}
html[data-theme="dark"] .home-page .hero-utility-art-dark{display:block;filter:drop-shadow(0 12px 24px rgba(0,0,0,.32))}

/* v15 responsive menu contrast hardening */
@media(max-width:980px){
  html[data-theme="dark"] .nav-links{background:var(--surface)!important;color:var(--ink)!important;border-color:var(--border)!important}
  html[data-theme="dark"] .nav-links a{color:var(--ink)!important}
  html[data-theme="dark"] .nav-links a:hover,html[data-theme="dark"] .nav-links a:focus-visible{color:var(--brand)!important}
}