*{box-sizing:border-box}
:root{
 --bg:#eef5f7;--panel:#fff;--text:#18323b;--muted:#607780;--brand:#167c83;--brand2:#0d5e64;
 --accent:#ef5b5b;--blue:#2b78a6;--gold:#d99a2b;--green:#2f8f63;--purple:#7658a8;
 --line:#d7e4e8;--soft:#f5fafb;--shadow:0 12px 30px rgba(31,72,83,.10);--radius:18px
}
html{scroll-behavior:smooth}
body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:linear-gradient(180deg,#f7fbfc,var(--bg));color:var(--text);min-height:100vh}
button,input,select,textarea{font:inherit} button{cursor:pointer}
a{color:inherit}
.site-header{max-width:1240px;margin:auto;padding:22px 24px 8px;display:flex;justify-content:space-between;align-items:center;gap:16px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;font-weight:900;color:var(--brand2);font-size:1.35rem}
.brand-badge{display:grid;place-items:center;width:38px;height:38px;border-radius:11px;background:var(--brand);color:#fff;font-size:.9rem}
.home-link{text-decoration:none;color:var(--brand2);font-weight:800;font-size:.92rem}
.page{max-width:1240px;margin:auto;padding:18px 24px 42px}
.panel{background:rgba(255,255,255,.97);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.hero{padding:28px 32px;display:flex;justify-content:space-between;align-items:center;gap:28px}
.hero h1{font-size:clamp(2rem,4vw,3.2rem);line-height:1.02;letter-spacing:-.04em;margin:.15rem 0 .65rem}
.hero p{margin:0;color:var(--muted);line-height:1.6;max-width:780px}
.eyebrow{text-transform:uppercase!important;letter-spacing:.09em;font-weight:900!important;font-size:.75rem!important;color:var(--brand)!important}
.badge-stack{display:flex;flex-wrap:wrap;gap:8px;justify-content:flex-end}
.badge{padding:8px 11px;border-radius:999px;background:#e9f6f6;color:var(--brand2);font-size:.8rem;font-weight:850;border:1px solid #cfe6e7}
.grid{display:grid;grid-template-columns:minmax(290px,.8fr) minmax(480px,1.55fr);gap:22px;margin-top:22px}
.controls,.workspace,.data-panel{padding:24px}
.section-title{display:flex;align-items:flex-start;gap:11px;margin-bottom:16px}
.step{width:31px;height:31px;border-radius:9px;background:var(--brand);color:#fff;display:grid;place-items:center;font-weight:900;flex:0 0 auto}
.section-title h2,.section-title h3{margin:0 0 3px}.section-title p{margin:0;color:var(--muted);font-size:.9rem}
label.control-label{display:block;font-weight:800;margin:14px 0 7px}
select,input[type=number],input[type=text]{width:100%;padding:11px 12px;border:1px solid #c8d8dc;border-radius:10px;background:#fff;color:var(--text)}
input[type=range]{width:100%;accent-color:var(--brand)}
.row{display:flex;gap:10px;align-items:center}.row>*{min-width:0}.row.wrap{flex-wrap:wrap}
.btn{border:0;border-radius:10px;padding:11px 14px;font-weight:850;background:var(--brand);color:white;box-shadow:0 6px 13px rgba(22,124,131,.16)}
.btn.secondary{background:#e9f6f6;color:var(--brand2);box-shadow:none}.btn.ghost{background:#f1f5f6;color:#536970;box-shadow:none}.btn.danger{background:#a94b53}.btn:disabled{opacity:.45;cursor:not-allowed}
.callout{border-left:4px solid var(--brand);padding:12px 14px;background:#f0f9f9;border-radius:9px;color:#526b73;line-height:1.5;font-size:.9rem}
.stat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.stat{padding:12px;border:1px solid var(--line);border-radius:12px;background:var(--soft)}
.stat span{display:block;color:var(--muted);font-size:.74rem;text-transform:uppercase;letter-spacing:.05em;font-weight:850}.stat strong{display:block;font-size:1.16rem;margin-top:3px}
.table-wrap{overflow:auto;border:1px solid var(--line);border-radius:12px}
table{width:100%;border-collapse:collapse;background:#fff}th,td{padding:10px 11px;border-bottom:1px solid #e2eaec;text-align:left;font-size:.88rem}th{background:#eef7f7;color:var(--brand2);font-size:.76rem;text-transform:uppercase;letter-spacing:.05em}
canvas{display:block;max-width:100%;width:100%;height:auto}
.graph-card{border:1px solid var(--line);background:#fbfdfd;border-radius:14px;padding:14px}
.graph-card h3{margin:0}.graph-card p{color:var(--muted);font-size:.85rem;margin:.25rem 0 .6rem}
.status{padding:11px 13px;border-radius:10px;background:#f3f7f8;color:#50666e;font-weight:750;line-height:1.4}
.status.good{background:#ecf8f1;color:#276b4b;border:1px solid #cce6d6}.status.warn{background:#fff7e7;color:#805c1c;border:1px solid #efdcb5}.status.bad{background:#fff0f0;color:#84434a;border:1px solid #f0cfd2}
footer{max-width:1240px;margin:auto;padding:0 24px 34px;color:#6d8087;font-size:.82rem;display:flex;justify-content:space-between;gap:12px}
.small{font-size:.82rem;color:var(--muted);line-height:1.5}
.muted{color:var(--muted)}
code.formula{font-family:"Segoe UI",Arial,sans-serif;font-weight:800}
@media(max-width:900px){.grid{grid-template-columns:1fr}.hero{flex-direction:column;align-items:flex-start}.badge-stack{justify-content:flex-start}.stat-grid{grid-template-columns:1fr 1fr}}
@media(max-width:600px){.site-header,.page,footer{padding-left:14px;padding-right:14px}.hero,.controls,.workspace,.data-panel{padding:18px}.site-header{align-items:flex-start;flex-direction:column}.stat-grid{grid-template-columns:1fr}.row{flex-wrap:wrap}}

.slider-block{margin:14px 0;padding:11px 12px;border:1px solid var(--line);border-radius:11px;background:#fafcfd}.slider-top{display:flex;justify-content:space-between;gap:10px;align-items:center}.slider-top label{font-weight:850}.slider-top strong{color:var(--brand2)}
.slider-block.locked{opacity:.6;background:#f0f3f4}.choice-btn{border:1px solid #bfd2d6;background:#fff;padding:10px 12px;border-radius:10px;font-weight:850;color:var(--text)}
.chamber-shell{position:relative;border:1px solid var(--line);border-radius:15px;background:linear-gradient(180deg,#f4fafc,#e3f0f3);padding:10px;overflow:hidden}.gauge{position:absolute;right:20px;top:18px;z-index:2;background:rgba(255,255,255,.93);border:1px solid #cfdee2;border-radius:12px;padding:10px 13px;text-align:center;box-shadow:0 5px 12px rgba(31,72,83,.08)}.gauge span,.gauge small{display:block;color:var(--muted);font-size:.68rem;text-transform:uppercase;font-weight:850}.gauge strong{font-size:1.25rem}.piston-label{position:absolute;left:20px;top:18px;background:rgba(255,255,255,.92);border-radius:10px;padding:8px 10px;font-weight:900;color:var(--brand2)}
.equation-strip{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:12px}.equation-strip>div{border:1px solid var(--line);border-radius:11px;padding:11px;background:#f8fbfc}.equation-strip span{display:block;font-size:.68rem;color:var(--muted);text-transform:uppercase;font-weight:850}.equation-strip strong{display:block;margin-top:3px}
.data-layout{display:grid;grid-template-columns:minmax(320px,.85fr) minmax(460px,1.3fr);gap:18px}.calc-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.calc-grid label{font-weight:800;font-size:.85rem}.calc-grid input{margin-top:6px}
@media(max-width:900px){.data-layout{grid-template-columns:1fr}.calc-grid{grid-template-columns:1fr 1fr}}@media(max-width:520px){.equation-strip,.calc-grid{grid-template-columns:1fr}}

.calc-grid input:disabled{background:#eef3f4;color:#47616a;border-style:dashed;font-weight:900;cursor:not-allowed}.calc-grid input:disabled::placeholder{color:#47616a;opacity:1}
/* Let the data table scroll inside its column on narrow screens. */
.data-layout>*{min-width:0}
@media(max-width:900px){.data-layout{grid-template-columns:minmax(0,1fr)}}