:root { --ink:#171816; --paper:#f3efe6; --panel:#faf8f2; --line:#d7d1c5; --muted:#716e67; --coral:#ff6b4a; --cyan:#9de3e0; --olive:#c9d4a7; }
* { box-sizing:border-box; }
html { scroll-behavior:smooth; }
body { margin:0; background:var(--paper); color:var(--ink); font-family:"Geist",Arial,sans-serif; }
button,input,select { font:inherit; } button { cursor:pointer; }
.topbar { height:72px; padding:0 4.5vw; display:flex; align-items:center; justify-content:space-between; border-bottom:1px solid var(--line); position:sticky; top:0; z-index:20; background:color-mix(in srgb,var(--paper) 92%,transparent); backdrop-filter:blur(16px); }
.brand { display:flex; align-items:center; gap:11px; color:inherit; text-decoration:none; font-size:20px; font-weight:720; letter-spacing:-.04em; }
.brand-mark { width:30px; height:30px; border-radius:50%; display:inline-grid; place-items:center; background:var(--ink); color:var(--cyan); font:italic 19px Georgia,serif; }
.nav-actions { display:flex; align-items:center; gap:12px; }
.portal-back { display:inline-flex; align-items:center; gap:7px; padding:9px 12px; border:1px solid var(--line); border-radius:30px; color:inherit; background:var(--panel); text-decoration:none; font-size:11px; font-weight:650; }
.portal-back span { color:var(--coral); font-size:15px; }
.system-badge { border:1px solid var(--line); padding:8px 13px; border-radius:30px; font:600 11px "Geist Mono",monospace; text-transform:uppercase; letter-spacing:.08em; }
.system-badge i { display:inline-block; width:7px; height:7px; border-radius:50%; background:#7ca274; margin-right:7px; box-shadow:0 0 0 3px #dce5ce; }
.text-button,.example-button { border:0; background:transparent; color:var(--ink); padding:9px 10px; font-weight:600; }
.text-button:hover,.example-button:hover { color:var(--coral); }
.print-button { border:0; border-radius:7px; background:var(--ink); color:white; padding:10px 17px; font-weight:650; }
.page-shell { width:min(1420px,91vw); margin:0 auto; }
.hero { display:grid; grid-template-columns:1.6fr .7fr; align-items:center; gap:7vw; padding:34px 0 30px; }
.kicker,.eyebrow { display:block; color:var(--muted); font:650 10px/1.2 "Geist Mono",monospace; text-transform:uppercase; letter-spacing:.12em; }
.hero-note { border-top:1px solid var(--ink); padding-top:14px; display:grid; grid-template-columns:35px 1fr; gap:16px; }
.hero-note>span { font:600 11px "Geist Mono",monospace; }.hero-note p { margin:0; color:var(--muted); font-size:14px; line-height:1.55; }
.workspace { display:grid; grid-template-columns:minmax(0,1.08fr) minmax(400px,.92fr); border:1px solid var(--ink); border-radius:12px; overflow:hidden; box-shadow:0 20px 70px rgba(48,43,34,.08); }
.inputs-panel { padding:28px; background:var(--panel); }
.section-title { display:flex; align-items:center; justify-content:space-between; gap:18px; }
.section-title>div,.result-header,.method>div,.options-heading { display:flex; align-items:center; gap:13px; }
.section-index { width:28px; height:28px; border:1px solid var(--ink); border-radius:50%; display:inline-grid; place-items:center; flex:0 0 auto; font:600 9px "Geist Mono",monospace; }
.section-index.light { border-color:rgba(255,255,255,.4); color:var(--cyan); }
.section-title h1,.result-header h2,.method h2,.options-heading h2 { margin:0; font-size:17px; letter-spacing:-.025em; }
.example-button { border-bottom:1px solid var(--ink); padding:5px 0; font-size:12px; }
.section-intro { margin:15px 0 22px 41px; color:var(--muted); font-size:12px; line-height:1.5; }
.rx-card,.distance-card,.formula-card { border:1px solid var(--line); border-radius:9px; padding:18px; background:#fffdfa; margin-top:12px; }
.rx-heading,.distance-topline { display:flex; align-items:center; justify-content:space-between; padding-bottom:13px; border-bottom:1px solid var(--line); }
.rx-badge { width:28px; height:22px; display:grid; place-items:center; border-radius:20px; background:var(--cyan); font:700 9px "Geist Mono",monospace; }
.rx-grid { display:grid; grid-template-columns:1fr 1fr .8fr; gap:9px; margin-top:14px; }
.rx-grid label { position:relative; color:var(--muted); font:600 9px "Geist Mono",monospace; text-transform:uppercase; letter-spacing:.07em; }
.rx-grid label>span { float:right; }
.rx-grid input { width:100%; margin-top:7px; border:1px solid var(--line); border-radius:6px; background:var(--paper); padding:10px; outline:0; font-size:18px; font-weight:650; color:var(--ink); }
.rx-grid input:focus { border-color:var(--coral); box-shadow:0 0 0 3px rgba(255,107,74,.12); }
.distance-topline strong { color:var(--coral); font-size:13px; }
.range { appearance:none; width:100%; height:5px; margin:25px 0 8px; border-radius:5px; background:linear-gradient(90deg,var(--coral),#ffd6cc); }
.range::-webkit-slider-thumb { appearance:none; width:20px; height:20px; border:5px solid var(--ink); border-radius:50%; background:white; box-shadow:0 0 0 2px white; }
.range-labels { display:flex; justify-content:space-between; color:var(--muted); font:500 8px "Geist Mono",monospace; }
.distance-card>p { margin:14px 0 0; color:var(--muted); font-size:9px; line-height:1.5; }
.formula-card { display:flex; align-items:center; gap:9px; min-height:67px; background:var(--paper); }
.formula-card>span { font:italic 20px Georgia,serif; }.formula-card>b,.formula-card>i { color:var(--coral); }.formula-card>i { font:italic 18px Georgia,serif; }
.formula-card p { margin:0 0 0 auto; max-width:190px; color:var(--muted); font-size:9px; line-height:1.5; text-align:right; }
.result-panel { position:relative; overflow:hidden; padding:28px; background:var(--ink); color:white; }
.result-panel::after { content:""; position:absolute; width:300px; height:300px; border:1px solid rgba(157,227,224,.08); border-radius:50%; right:-150px; top:-140px; }
.result-panel>p { margin:15px 0 5px 41px; color:#aaa9a4; font-size:12px; }
.error { margin:30px 0; padding:15px; border:1px solid var(--coral); color:#ffd4ca; font-size:12px; }
.lens-visual { height:205px; position:relative; display:grid; place-items:center; }
.lens-profile { width:190px; height:142px; position:relative; display:grid; place-items:center; }
.lens-profile>span { position:absolute; width:45px; height:138px; border:2px solid var(--cyan); border-top:0; border-bottom:0; border-radius:50%; transition:transform .25s ease; }
.lens-profile>span:last-of-type { width:29px; border-color:rgba(255,255,255,.35); }
.lens-profile>i { width:7px; height:7px; border-radius:50%; background:var(--coral); position:relative; z-index:2; }
.lens-label { position:absolute; right:8%; bottom:17px; padding:7px 10px; border-radius:30px; background:var(--cyan); color:var(--ink); font:650 9px "Geist Mono",monospace; }
.distance-axis { position:absolute; left:7%; top:50%; display:flex; align-items:center; gap:5px; color:#8c8d87; font:italic 13px Georgia,serif; }
.distance-axis i { width:22px; height:1px; background:#555650; }.distance-axis i:last-child { width:8px; }
.main-result { border-top:1px solid #393a36; border-bottom:1px solid #393a36; padding:18px 0; }
.main-result>span,.exact-result span { display:block; color:#aaa9a4; font-size:10px; margin-bottom:7px; }
.main-result>strong { display:block; font-size:clamp(28px,3.2vw,44px); letter-spacing:-.06em; white-space:nowrap; }
.main-result>small { display:block; margin-top:5px; color:#858680; font:500 8px "Geist Mono",monospace; text-transform:uppercase; letter-spacing:.08em; }
.exact-result { display:flex; align-items:center; justify-content:space-between; gap:18px; padding:17px 0; border-bottom:1px solid #393a36; }
.exact-result span { margin:0; }.exact-result strong { font-size:13px; }
.metric-grid { display:grid; grid-template-columns:1fr 1fr 1.15fr; margin-top:18px; }
.metric-grid>div { padding-right:10px; }.metric-grid>div+div { padding-left:10px; border-left:1px solid #393a36; }
.metric-grid span,.metric-grid strong { display:block; }.metric-grid span { min-height:25px; color:#858680; font-size:8px; text-transform:uppercase; letter-spacing:.06em; }
.metric-grid strong { display:inline-block; margin-top:5px; font-size:14px; }.metric-grid small { margin-left:4px; color:#858680; font-size:8px; }
.clinical-note { display:grid; grid-template-columns:27px 1fr; gap:13px; margin-top:21px; align-items:start; }
.clinical-note>span { width:27px; height:27px; display:grid; place-items:center; border-radius:50%; background:var(--olive); color:var(--ink); }
.clinical-note p { margin:3px 0 0; color:#b8b9b3; font-size:10px; line-height:1.5; }
.rounding-options { display:flex; align-items:center; justify-content:space-between; gap:35px; padding:25px 28px; border:1px solid var(--ink); border-top:0; border-radius:0 0 12px 12px; background:var(--panel); }
.options-heading>div h2 { margin-bottom:3px; }.options-heading p { margin:0; color:var(--muted); font-size:10px; }
.options-controls { display:flex; align-items:end; gap:10px; }.options-controls label { color:var(--muted); font-size:9px; }
.options-controls select { display:block; min-width:105px; margin-top:5px; padding:9px; border:1px solid var(--line); border-radius:5px; background:white; }
.options-controls button { height:37px; border:0; border-radius:6px; padding:0 14px; background:var(--coral); font-weight:700; }.options-controls button span { margin-left:18px; }
.method { padding:48px 0; display:grid; grid-template-columns:.4fr 1fr; align-items:center; border-bottom:1px solid var(--line); }
.method-flow { display:grid; grid-template-columns:auto 1fr auto 1fr auto; align-items:center; gap:13px; }.method-flow span { color:var(--muted); font-size:10px; line-height:1.45; }
.method-flow b { display:block; color:var(--coral); font:600 9px "Geist Mono",monospace; margin-bottom:5px; }.method-flow i { height:1px; position:relative; background:var(--line); }
.method-flow i::after { content:""; position:absolute; right:0; top:-2px; width:5px; height:5px; border-radius:50%; background:var(--coral); }
footer { min-height:116px; display:grid; grid-template-columns:.5fr 1fr auto; align-items:center; gap:6vw; }.footer-brand { display:flex; align-items:center; gap:10px; }.footer-brand strong { letter-spacing:-.03em; }
footer p { max-width:650px; margin:0; color:var(--muted); font-size:10px; line-height:1.5; } footer>span { color:var(--muted); font:600 9px "Geist Mono",monospace; }
@media(max-width:980px){.hero{grid-template-columns:1fr;gap:22px}.workspace{grid-template-columns:1fr}.result-panel{min-height:620px}.rounding-options{align-items:flex-start;flex-direction:column}.method{grid-template-columns:1fr;gap:25px}}
@media(max-width:650px){.topbar{height:68px;padding:0 18px}.system-badge,.text-button{display:none}.portal-back{font-size:0;padding:9px}.portal-back span{font-size:16px}.page-shell{width:calc(100% - 28px)}.hero{padding:24px 0}.inputs-panel,.result-panel{padding:21px 17px}.section-intro{margin-left:0}.rx-grid{grid-template-columns:1fr 1fr}.rx-grid label:last-child{grid-column:1/-1}.formula-card{flex-wrap:wrap}.formula-card p{max-width:none;width:100%;text-align:left;margin:4px 0 0}.main-result>strong{font-size:27px}.metric-grid{grid-template-columns:1fr;gap:12px}.metric-grid>div+div{padding:12px 0 0;border-left:0;border-top:1px solid #393a36}.metric-grid span{min-height:0}.options-controls{width:100%;display:grid;grid-template-columns:1fr auto}.options-controls select{width:100%}.method-flow{grid-template-columns:1fr}.method-flow i{display:none}footer{grid-template-columns:1fr;gap:12px;padding:28px 0}}
@media print{.topbar,.hero,.example-button,.rounding-options button,.method{display:none!important}.page-shell{width:100%}.workspace{border-radius:0}.rounding-options{border-radius:0}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}