/* Glacier / teal / iris / copper — Catenary's daylight engineering palette. */
:root{color-scheme:light;--bg:#f1f7fa;--panel:#fff;--line:#c5d9e2;--muted:#425d70;--blue:#554591;--mint:#006674;--ink:#183d50;--copper:#a64c25}
body{color:var(--ink);background-color:var(--bg);background-image:radial-gradient(ellipse at 92% 5%,#e6defc88,transparent 48%),linear-gradient(#759daf18 1px,transparent 1px),linear-gradient(90deg,#759daf18 1px,transparent 1px);background-size:auto,44px 44px,44px 44px}
header{background:linear-gradient(115deg,#075c70,#217589);border-bottom:3px solid #eeb279;box-shadow:0 6px 24px #153e5012}
.brand{color:#fff}.brand b{color:#fff;border-color:#9bdfef;background:#ffffff12}.brand small{color:#d7eff6}
.actions button{color:#fff;border-color:#9bd5e4;background:#ffffff0b}.actions #connection{color:#e3f4f8}
nav{background:#e8edf8;border-bottom:1px solid #c8d3e8}nav a{color:#3e4779}nav a.active{color:#006674;font-weight:700}
button,.button{color:#fff;background:#006674;border-color:#006674;box-shadow:0 3px 8px #07596a14}
button:hover,.button:hover{filter:brightness(.94)}button:disabled{background:#e4ebf2;color:#415e72;border-color:#a6bacb;opacity:1;box-shadow:none}
.hero .button+.button{background:#655298;border-color:#655298}.hero h1{color:#164b60}.hero h1 em{color:#655298}
.eyebrow{color:#8e4527}.hero .art{background:linear-gradient(145deg,#e6f4f8,#f1edfc);border-color:#adccd9;border-radius:14px;box-shadow:0 15px 36px #385f7d12}
.card{border-radius:12px;box-shadow:0 8px 28px #2648610b;border-top:3px solid #5ca0b3}.grid>.card:nth-child(2){background:#f1eefb;border-top-color:#9b89c2}.grid>.card:nth-child(3){background:#fff2e9;border-top-color:#d39a70}
.stats{border-color:#bbd2de;background:#e5f1f6;border-radius:10px;padding:22px}.stats strong{color:#005e70}
.tools button{background:#ffffffb8;color:#415a70;border-color:#becfdb;box-shadow:none}.tools button.selected{background:#006674;color:#fff;border-color:#006674}
input,select{background:#f6fafc;color:#193e50;border-color:#b6cbd9}.formula{background:#ece8f7;border-left-color:#7561a5;color:#3f346b;border-radius:0 7px 7px 0}
.result{color:#006674}.result small{color:#425d70}.error,.warning{color:#9e4020;background:#fff0e5;padding:12px;border-radius:6px}
.engineering-svg{color:#327c96}.engineering-svg text{fill:#39546c}.part-fill{fill:#d4eaf3;stroke:#397e98}.core{fill:#fff;stroke:#397e98}.fine,.dimension{stroke:#5976a6}.belt-running{stroke:#007e85}.material-fill{fill:#e5caad;stroke:#ad7846}.roller{fill:none;stroke:#537f95;stroke-width:5}
footer{background:#e2edf5;border-color:#bed2df;color:#3c576e}footer a{color:#514280}
#splash{background:radial-gradient(ellipse at 10% 10%,#c6eaf4,transparent 65%),radial-gradient(ellipse at 90% 95%,#ded5f6,transparent 65%),#f1f7fa;color:#164b60}
#splash .eyebrow{color:#78502f}#splash h1{color:#164b60}.splash-c{color:#006674;border-color:#5b9cad;background:#ffffff70;border-radius:18px;box-shadow:0 12px 40px #24667d16}
button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline-color:#a74b24}main:focus{outline:none}main:focus-visible{outline:2px solid #7561a5;outline-offset:4px}