:root{color-scheme:dark;--bg:#090f1c;--panel:#111c2d;--panel2:#152339;--panel3:#1b2b42;--text:#f2f6ff;--muted:#a4b5c9;--quiet:#7890ac;--line:#2b3b53;--accent:#66e4ba;--accent2:#82a4ff;--warm:#f3bf75;--shadow:0 20px 55px rgba(0,0,0,.22);font-synthesis:none}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:radial-gradient(ellipse 950px 540px at 87% -2%,rgba(72,109,194,.14),transparent 70%),radial-gradient(ellipse 800px 550px at 0% 21%,rgba(29,154,128,.08),transparent 70%),var(--bg);font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.55;color:var(--text);min-height:100vh}a{color:inherit;text-decoration:none}a:hover{color:var(--accent)}button,input,select{font:inherit}button{cursor:pointer}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:2px solid var(--accent);outline-offset:3px}::selection{background:#3d806f;color:white}.shell{width:min(1130px,calc(100% - 44px));margin-inline:auto}.topbar{border-bottom:1px solid rgba(130,159,199,.15);background:rgba(9,15,28,.76);backdrop-filter:blur(16px);position:sticky;top:0;z-index:20}.nav-inner{height:76px;display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{display:inline-flex;align-items:center;gap:12px;font-weight:850;font-size:22px;letter-spacing:-.85px}.brand-icon{width:38px;height:38px;display:block}.brand span span{color:var(--accent)}.navlinks{display:flex;gap:26px;align-items:center;font-size:14px;color:var(--muted);font-weight:600}.navlinks a:hover,.navlinks a.active{color:var(--text)}.lang{border:1px solid var(--line);border-radius:12px;padding:8px 11px;display:inline-flex;align-items:center;gap:9px;font-size:12px;font-weight:750;letter-spacing:.03em}.lang a.active{color:var(--accent)}.lang .sep{color:#536883}.hero{padding:76px 0 44px}.eyebrow{display:inline-flex;align-items:center;gap:8px;border:1px solid rgba(102,228,186,.23);border-radius:999px;color:var(--accent);background:rgba(102,228,186,.075);padding:7px 12px;font-size:11px;text-transform:uppercase;font-weight:800;letter-spacing:.13em}.eyebrow:before{content:"";width:7px;height:7px;background:var(--accent);border-radius:50%;box-shadow:0 0 0 4px rgba(102,228,186,.08)}h1{font-weight:850;font-size:clamp(39px,5.2vw,66px);line-height:1.09;letter-spacing:-.055em;margin:23px 0 18px;max-width:850px}h1 .gradient{background:linear-gradient(105deg,#73e8be,#86b1ff);-webkit-background-clip:text;background-clip:text;color:transparent}.lead{font-size:17px;color:var(--muted);max-width:660px;line-height:1.8;margin:0 0 26px}.hero-actions{display:flex;gap:12px;flex-wrap:wrap}.btn{background:var(--accent);color:#0c2522;display:inline-flex;align-items:center;justify-content:center;gap:9px;border-radius:12px;padding:12px 18px;border:1px solid transparent;font-size:14px;font-weight:800;transition:transform .15s,background .15s;min-height:45px}.btn:hover{color:#0c2522;background:#8bf0d1;transform:translateY(-1px)}.btn.ghost{background:transparent;border-color:var(--line);color:var(--text)}.btn.ghost:hover{color:var(--accent);border-color:#518c89}.stats{display:flex;gap:28px;color:var(--muted);font-size:13px;margin-top:43px}.stats b{color:white;font-size:17px}.stats>div{display:flex;gap:8px;align-items:baseline}.section{padding:34px 0 55px}.section-title{font-size:28px;letter-spacing:-.04em;margin:0 0 8px}.section-desc{color:var(--muted);font-size:15px;max-width:740px;margin:0 0 25px}.category-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:17px}.category{background:linear-gradient(145deg,rgba(24,39,62,.9),rgba(16,28,46,.95));border:1px solid var(--line);border-radius:20px;padding:26px;position:relative;overflow:hidden;min-height:165px}.category:after{content:"";width:130px;height:130px;border:1px solid rgba(130,160,230,.08);border-radius:50%;position:absolute;right:-36px;bottom:-49px}.category .sym{font-size:28px;line-height:1}.category h3{font-size:18px;margin:16px 0 4px;letter-spacing:-.015em}.category p{font-size:13px;color:var(--muted);margin:0}.tools{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:17px}.tool-card{min-height:248px;border:1px solid var(--line);border-radius:20px;background:rgba(17,28,45,.95);padding:24px;display:flex;flex-direction:column;gap:11px;transition:transform .16s,border-color .16s,background .16s}.tool-card:hover{transform:translateY(-4px);border-color:#4f827f;background:#152438;color:var(--text)}.tool-card .icon-box{height:43px;width:43px;display:flex;align-items:center;justify-content:center;font-size:22px;border-radius:12px;background:rgba(104,177,255,.1)}.tag{display:inline-block;color:#9ab6d1;font-size:11px;text-transform:uppercase;letter-spacing:.09em;font-weight:800}.tool-card h3{font-size:19px;line-height:1.25;margin:0;letter-spacing:-.02em}.tool-card p{font-size:13px;color:var(--muted);margin:0;flex:1}.tool-footer{color:var(--accent);font-size:12px;font-weight:800}.info-band{margin:10px 0 65px;padding:27px 30px;border:1px solid rgba(102,228,186,.18);background:linear-gradient(100deg,rgba(102,228,186,.08),rgba(110,132,213,.045));border-radius:20px;display:flex;align-items:center;justify-content:space-between;gap:24px}.info-band h3{font-size:19px;margin:0 0 3px}.info-band p{margin:0;color:var(--muted);font-size:13px;max-width:630px}.footer{border-top:1px solid var(--line);padding:31px 0 50px;color:var(--quiet);font-size:12px}.footer-inner{display:flex;justify-content:space-between;gap:24px;align-items:center;flex-wrap:wrap}.footer a{color:var(--muted)}.footer a:hover{color:var(--accent)}.breadcrumbs{padding:28px 0 0;color:var(--quiet);font-size:12px}.breadcrumbs a:hover{color:var(--accent)}.calc-top{padding:33px 0 27px}.calc-top h1{font-size:clamp(34px,4.4vw,50px);max-width:920px;margin:17px 0 14px}.calc-top .lead{max-width:775px;font-size:16px;margin-bottom:0}.calc-layout{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(320px,.9fr);gap:20px;align-items:start;padding:8px 0 44px}.card{background:rgba(17,28,45,.96);border:1px solid var(--line);border-radius:20px;padding:27px}.card h2{font-size:20px;letter-spacing:-.025em;margin:0 0 5px}.card .sub{color:var(--muted);font-size:13px;margin:0 0 22px}.fields{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:17px 16px}.field{display:flex;flex-direction:column;gap:8px}.field.wide{grid-column:1/-1}.field label{font-size:13px;font-weight:750;color:#d6e4f3}.field .hint{font-size:11px;color:var(--quiet);margin-top:-2px;line-height:1.5}.field input,.field select{width:100%;height:46px;background:#0c1728;border:1px solid #34455d;color:var(--text);border-radius:10px;padding:0 13px;outline:none}.field input:focus,.field select:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(102,228,186,.1)}.field input::placeholder{color:#627794}.field input[aria-invalid="true"]{border-color:#ef9d94}.result-card{background:radial-gradient(circle at 100% 0%,rgba(102,228,186,.09),transparent 54%),var(--panel);border:1px solid #35665f;border-radius:20px;padding:28px;position:sticky;top:98px}.result-card h2{font-size:18px;margin:0;color:#dbe8f6}.result-eyebrow{font-size:11px;text-transform:uppercase;letter-spacing:.1em;font-weight:850;color:var(--accent);margin:24px 0 6px}.big-number{font-size:clamp(36px,4.6vw,51px);font-weight:850;letter-spacing:-.05em;line-height:1.15;color:#92f2d3;overflow-wrap:anywhere}.result-caption{color:var(--muted);font-size:12px;margin:7px 0 22px}.breakdown{border-top:1px solid #37556a;padding-top:17px;display:grid;gap:13px}.result-line{display:flex;justify-content:space-between;gap:12px;color:var(--muted);font-size:13px}.result-line b{color:#e6f1fa;font-variant-numeric:tabular-nums;white-space:nowrap}.result-actions{display:flex;flex-wrap:wrap;gap:9px;margin-top:25px}.result-actions button{flex:1;white-space:nowrap}.note{color:var(--quiet);font-size:11px;line-height:1.65;margin:19px 0 0}.preset{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:20px}.preset button{background:#192b43;color:#bdd0e4;border:1px solid #36506c;padding:8px 11px;border-radius:9px;font-size:12px;font-weight:650}.preset button:hover{border-color:var(--accent);color:var(--accent)}.explain{margin:12px 0 66px;display:grid;grid-template-columns:1.4fr .6fr;gap:20px}.explain .card{padding:26px 29px}.explain h2{font-size:22px;letter-spacing:-.025em;margin:0 0 13px}.explain h3{font-size:16px;margin:24px 0 10px}.explain p,.explain li{font-size:14px;color:var(--muted);line-height:1.8}.explain ol,.explain ul{padding-left:19px}.tip{background:#16293c;border-left:3px solid var(--accent);padding:13px 16px;border-radius:7px;color:#c4d8eb;font-size:13px;margin-top:20px}.related{display:flex;flex-direction:column;gap:10px}.related a{border:1px solid var(--line);border-radius:10px;padding:13px;display:flex;justify-content:space-between;align-items:center;font-size:13px;font-weight:700}.related a:hover{border-color:var(--accent)}.notice{border:1px solid #3a5670;color:#c3d7ec;border-radius:11px;padding:12px 15px;font-size:12px;line-height:1.6;margin-top:18px;background:#152337}.intro-grid{margin:17px 0 30px;display:flex;gap:9px;flex-wrap:wrap}.intro-grid span{color:#bcd0e3;background:#142338;border:1px solid #2d455f;border-radius:999px;padding:5px 10px;font-size:11px;font-weight:650}.screenreader{position:absolute;width:1px;height:1px;clip:rect(0,0,0,0);overflow:hidden}.no-js{padding:14px;background:#5c332a;color:white;text-align:center}.disclaimer{font-size:12px;color:var(--quiet);padding:12px 0 0}.tool-card .soon{color:#9aadc5}.mobile-nav{display:none}.toast{font-size:12px;color:var(--accent);min-height:20px;margin:9px 0 0}@media(max-width:900px){.tools,.category-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.calc-layout{grid-template-columns:1fr}.result-card{position:static}.explain{grid-template-columns:1fr}.navlinks{gap:14px}}@media(max-width:620px){.shell{width:min(100% - 30px,1130px)}.nav-inner{height:67px}.brand{font-size:20px}.brand-icon{width:34px;height:34px}.navlinks{display:none}.mobile-nav{display:flex;font-size:12px;gap:14px;color:var(--muted)}.hero{padding:52px 0 31px}h1{font-size:42px}.lead{font-size:15px}.section{padding:23px 0 37px}.category-grid,.tools{grid-template-columns:1fr}.category{min-height:145px}.tool-card{min-height:190px}.stats{gap:11px;flex-wrap:wrap;font-size:11px;margin-top:28px}.stats b{font-size:14px}.info-band{display:block;margin-bottom:44px}.info-band .btn{margin-top:14px}.fields{grid-template-columns:1fr}.card,.result-card{padding:20px}.calc-top{padding:20px 0}.calc-top h1{font-size:36px}.breadcrumbs{padding-top:20px}.footer-inner{align-items:flex-start;flex-direction:column}}
@media print{.topbar,.footer,.result-actions,.related,.info-band,.breadcrumbs,.preset,.hero-actions{display:none!important}body{background:white;color:black}.shell{width:100%}.card,.result-card{background:white;color:black;border:1px solid #bbb}.calc-layout{grid-template-columns:1fr 1fr}.result-line b,.result-card h2,.big-number{color:black}.field input,.field select{color:black;background:white;border:1px solid #ddd}.explain{display:none}}

/* TechCalc 2.0 enhancements */
.tool-controls{margin:0 0 25px;display:flex;flex-wrap:wrap;gap:12px;align-items:center}
#tool-search{height:45px;min-width:230px;flex:1;background:#0d1a2a;color:var(--text);border:1px solid #34455d;border-radius:12px;padding:0 15px;font-size:14px}
.filters{display:flex;flex-wrap:wrap;gap:6px}.filter{background:#18283d;color:var(--muted);border:1px solid var(--line);border-radius:999px;padding:9px 12px;font-size:12px;font-weight:700}.filter:hover,.filter.active{border-color:var(--accent);color:var(--accent)}.filter-feedback{width:100%;font-size:13px;margin:0;color:var(--muted)}
.tool-card[hidden]{display:none!important}.batch-result{color:var(--accent);font-size:13px;font-weight:750;margin:2px 0 16px;line-height:1.65}
.faq{margin-top:12px}.faq details{border-top:1px solid var(--line);padding:14px 0}.faq summary{color:#dbe8f6;cursor:pointer;font-weight:750;font-size:14px}.faq p{margin:10px 0 0}.skip-link{position:absolute;left:-9999px;top:8px;background:var(--accent);color:#0c2522;padding:9px 15px;border-radius:8px;z-index:100}.skip-link:focus{left:12px}
@media(max-width:620px){.tool-controls{display:block}.filters{margin-top:10px}#tool-search{width:100%}.filter{font-size:11px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important}}
@media print{.batch-result{color:black}.tool-controls{display:none!important}}

/* SEO FAQ — accessible and crawlable without client-side JavaScript */
.seo-faq { margin: 2.5rem auto 4rem; max-width: 980px; }
.seo-faq h2 { margin: 0 0 1rem; font-size: clamp(1.3rem, 2vw, 1.7rem); }
.faq-entry { background:#111d30; border:1px solid #263650; border-radius:12px; margin-bottom:10px; padding:16px 20px; }
.faq-entry summary { cursor:pointer; font-weight:700; }
.faq-entry p { margin:.8rem 0 0; line-height:1.65; color:#b4c7e3; }