/* Inter (variable, latin subset), self-hosted so the page makes no request to a third party. SIL OFL 1.1: fonts/Inter-OFL-LICENSE.txt */
@font-face{font-family:'Inter';font-style:normal;font-weight:100 900;font-display:swap;src:url(fonts/inter-latin-wght-normal.woff2) format('woff2-variations'),url(fonts/inter-latin-wght-normal.woff2) format('woff2')}
/* Flowstead web (D108): the portfolio's look (hazemmancy.github.io), so the two read as one site.
   SPDX-License-Identifier: GPL-3.0-or-later */
:root{--radius:.5rem;--font:'Inter',system-ui,-apple-system,sans-serif;--mono:ui-monospace,SFMono-Regular,Menlo,monospace;--nav-h:3.5rem}
[data-theme="dark"]{--bg:hsl(222,47%,7%);--bg-card:hsl(222,41%,11%);--bg-input:hsl(222,41%,16%);--border:hsl(222,30%,20%);--fg:hsl(210,40%,98%);--muted:hsl(215,20%,65%);--primary:hsl(217,91%,66%);--primary-fill:hsl(217,91%,50%);--primary-bg:hsl(217,91%,60%,.12);--ok:hsl(142,71%,55%);--warn:hsl(38,92%,60%);--err:hsl(0,84%,72%);--vap:hsl(38,92%,60%);--liq:hsl(174,62%,55%);color-scheme:dark}
[data-theme="light"]{--bg:hsl(0,0%,100%);--bg-card:hsl(0,0%,98%);--bg-input:hsl(210,40%,96%);--border:hsl(214,32%,86%);--fg:hsl(222,47%,11%);--muted:hsl(215,19%,35%);--primary:hsl(217,91%,45%);--primary-fill:hsl(217,91%,45%);--primary-bg:hsl(217,91%,50%,.08);--ok:hsl(142,76%,24%);--warn:hsl(30,95%,30%);--err:hsl(0,72%,40%);--vap:hsl(30,95%,35%);--liq:hsl(174,80%,24%);color-scheme:light}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{font-family:var(--font);background:var(--bg);color:var(--fg);line-height:1.6;min-height:100vh;display:flex;flex-direction:column}
a{color:var(--primary)} button,input,select{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--primary);outline-offset:2px}
.skip-link{position:absolute;left:.5rem;top:-3rem;z-index:100;padding:.5rem .9rem;border-radius:var(--radius);background:var(--primary-fill);color:#fff;font-weight:600;text-decoration:none}
.skip-link:focus{top:.5rem}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}
.wrap{max-width:72rem;margin:0 auto;padding:0 1rem}
/* nav */
header{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--bg) 94%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}
.nav{height:var(--nav-h);display:flex;align-items:center;justify-content:space-between;gap:1rem}
.logo{font-weight:700;font-size:1.2rem;text-decoration:none;color:var(--fg);letter-spacing:-.02em}.logo b{color:var(--primary)}
.nav-links{display:flex;align-items:center;gap:.25rem;flex-wrap:wrap}
.nav-links a{font-size:.7rem;font-weight:500;letter-spacing:.08em;color:var(--muted);text-decoration:none;padding:.375rem .6rem;border-radius:var(--radius)}
.nav-links a:hover{color:var(--fg);background:var(--bg-input)} .nav-links a[aria-current]{color:var(--fg)}
.icon-btn{width:2.25rem;height:2.25rem;display:inline-flex;align-items:center;justify-content:center;border-radius:var(--radius);border:none;background:none;color:var(--muted);cursor:pointer}
.icon-btn:hover{background:var(--bg-input);color:var(--fg)} .icon-btn svg{width:16px;height:16px}
@media(max-width:640px){.nav-links a.opt{display:none}}
/* hero */
.hero{padding:2.5rem 0 1.5rem;text-align:center}
.label{font-size:.7rem;font-weight:600;letter-spacing:.15em;color:var(--primary);text-transform:uppercase}
h1{font-size:clamp(1.9rem,5vw,2.8rem);font-weight:800;letter-spacing:-.03em;line-height:1.15;margin:.35rem 0 .6rem}
.lead{color:var(--muted);max-width:42rem;margin:0 auto;font-size:.95rem}
/* engine status */
.status{display:flex;align-items:center;gap:.6rem;justify-content:center;margin:1.25rem auto 0;font-size:.8rem;color:var(--muted);max-width:40rem}
.status .dot{width:8px;height:8px;border-radius:50%;background:var(--warn);flex-shrink:0}
.status.ready .dot{background:var(--ok)} .status.failed .dot{background:var(--err)}
.bar{height:3px;background:var(--bg-input);border-radius:2px;overflow:hidden;max-width:24rem;margin:.6rem auto 0}
.bar i{display:block;height:100%;width:0;background:var(--primary);transition:width .2s}
/* layout */
main{flex:1;padding-bottom:3rem}
.grid{display:grid;gap:1rem;align-items:start;grid-template-columns:minmax(0,1fr)} @media(min-width:960px){.grid{grid-template-columns:minmax(0,26rem) minmax(0,1fr)}}
.card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:1.1rem 1.2rem}
.card+.card{margin-top:1rem}
h2{font-size:.95rem;font-weight:600;margin-bottom:.75rem;display:flex;align-items:center;gap:.5rem}
h2 .n{width:1.4rem;height:1.4rem;border-radius:50%;background:var(--primary-bg);color:var(--primary);font-size:.7rem;display:inline-flex;align-items:center;justify-content:center}
h3{font-size:.8rem;font-weight:600;margin:1rem 0 .5rem;color:var(--muted);letter-spacing:.04em;text-transform:uppercase}
label,.flabel{display:block;font-size:.72rem;font-weight:500;color:var(--muted);margin-bottom:.25rem}
input[type=number],input[type=search],input[type=text],select{width:100%;min-width:0;background:var(--bg-input);border:1px solid var(--border);border-radius:calc(var(--radius) - 2px);padding:.45rem .6rem;font-size:.85rem}
input:focus,select:focus{border-color:var(--primary);outline:none}
.row{display:grid;grid-template-columns:minmax(0,1fr) 7rem;gap:.4rem}
.field+.field{margin-top:.65rem}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.4rem;padding:.5rem 1rem;border-radius:var(--radius);font-size:.85rem;font-weight:500;cursor:pointer;border:1px solid var(--border);background:transparent;color:var(--fg);text-decoration:none}
.btn:hover{background:var(--bg-input)} .btn[disabled]{opacity:.5;cursor:not-allowed}
.btn-primary{background:var(--primary-fill);border-color:var(--primary-fill);color:#fff} .btn-primary:hover{background:var(--primary-fill);opacity:.9}
.btn-sm{padding:.3rem .6rem;font-size:.75rem}
.actions{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:1rem}
/* compound search */
.search-results{list-style:none;margin-top:.35rem;max-height:13rem;overflow:auto;border:1px solid var(--border);border-radius:calc(var(--radius) - 2px)}
.search-results:empty{display:none}
.search-results button{width:100%;text-align:left;display:flex;justify-content:space-between;gap:.5rem;padding:.4rem .6rem;background:none;border:none;border-bottom:1px solid var(--border);cursor:pointer;font-size:.8rem}
.search-results li:last-child button{border-bottom:none} .search-results button:hover,.search-results button:focus-visible{background:var(--primary-bg)}
.search-results small{color:var(--muted);font-family:var(--mono);font-size:.7rem}
/* composition */
.comp{width:100%;border-collapse:collapse;margin-top:.5rem;font-size:.82rem}
.comp td{padding:.25rem 0;vertical-align:middle} .comp td:first-child{width:100%;padding-right:.5rem;overflow-wrap:anywhere}
.comp input{width:6.5rem;text-align:right;font-family:var(--mono)}
.comp .rm{margin-left:.25rem}
.total{display:flex;justify-content:space-between;align-items:center;font-size:.78rem;color:var(--muted);margin-top:.5rem;gap:.5rem;flex-wrap:wrap}
.total.bad b{color:var(--warn)} .empty{font-size:.8rem;color:var(--muted);padding:.5rem 0}
/* results */
.msgs{list-style:none;display:flex;flex-direction:column;gap:.4rem;margin-bottom:.75rem}
.msgs li{font-size:.8rem;padding:.5rem .7rem;border-radius:calc(var(--radius) - 2px);border:1px solid var(--border)}
.msgs .error{border-color:color-mix(in srgb,var(--err) 50%,transparent);color:var(--err)}
.msgs .warning{border-color:color-mix(in srgb,var(--warn) 50%,transparent);color:var(--warn)}
.kpis{display:grid;grid-template-columns:repeat(auto-fit,minmax(9.5rem,1fr));gap:.6rem}
.kpi{background:var(--bg-input);border-radius:calc(var(--radius) - 2px);padding:.6rem .7rem}
.kpi span{display:block;font-size:.68rem;color:var(--muted)} .kpi b{font-family:var(--mono);font-size:1rem;font-weight:600}
.kpi small{color:var(--muted);font-size:.7rem;margin-left:.2rem}
.table-wrap{overflow-x:auto;margin-top:.5rem;border:1px solid var(--border);border-radius:calc(var(--radius) - 2px)}
table.props{width:100%;border-collapse:collapse;font-size:.78rem}
table.props th,table.props td{padding:.4rem .6rem;border-bottom:1px solid var(--border);white-space:nowrap}
table.props thead th{position:sticky;top:0;background:var(--bg-card);font-weight:600;text-align:right}
table.props thead th:first-child,table.props tbody th{text-align:left;font-weight:500;color:var(--muted)}
table.props td{text-align:right;font-family:var(--mono)} table.props tr:last-child>*{border-bottom:none}
table.props .unit{color:var(--muted);font-family:var(--font);font-weight:400}
.ph-vapour{color:var(--vap)} .ph-liquid{color:var(--liq)}
.placeholder{color:var(--muted);font-size:.85rem;text-align:center;padding:2.5rem 1rem}
.meta{font-size:.72rem;color:var(--muted);margin-top:.75rem}
/* plot */
.plot svg{width:100%;height:auto;display:block;font-family:var(--font)}
.plot .axis{stroke:var(--border)} .plot .grid line{stroke:var(--border);stroke-dasharray:2 3}
.plot text{fill:var(--muted);font-size:11px}
.legend{display:flex;flex-wrap:wrap;gap:.9rem;font-size:.74rem;color:var(--muted);margin-top:.4rem}
.legend i{display:inline-block;width:14px;height:3px;vertical-align:middle;margin-right:.35rem;border-radius:2px}
/* footer */
.disclaimer{display:flex;gap:.6rem;font-size:.75rem;color:var(--muted);border:1px solid color-mix(in srgb,var(--warn) 35%,transparent);background:color-mix(in srgb,var(--warn) 6%,transparent);border-radius:var(--radius);padding:.8rem 1rem;margin-top:1.5rem}
footer{border-top:1px solid var(--border);padding:1.25rem 0;font-size:.75rem;color:var(--muted)}
footer .wrap{display:flex;flex-wrap:wrap;gap:.75rem;justify-content:space-between}