/* Shared look of the optics tools (transposition and vertex, visual acuity): the refraction room plan's design —
   theme colours, a showroom page header with our own instruments, numbered white question cards with tiles and
   +/- steppers on a tinted panel, the result in white cards. Owner, 26 Sep 2026 night: tools that bring professionals. */
.optt{--b:var(--brand,#1e2fa0);--ink2:var(--ink,#0e1330);--mu:var(--muted,#59627d);--ru:var(--rule,#dce0ea);--ti:var(--tint,#eef0f8);--mo:var(--mono,monospace);
	--ok:#1f7a4d;--warn:#c77700;--bad:#a12622;
	color:var(--ink2);margin:8px 0 40px;width:min(1080px,calc(100vw - 32px));max-width:none;scroll-margin-top:90px}
.optt button:not(.btn){font:inherit;color:inherit;background:none;border:0;cursor:pointer;padding:0}
.optt__pos{font-family:var(--mo);font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--mu);margin:0 0 12px}

/* page header = showroom */
.optt-band{background:radial-gradient(900px 420px at 85% 10%,#fff 0%,var(--tint,#eef0f8) 75%)!important;border-bottom:0!important;padding:52px 0 44px!important}
.optt-band.has-stage .wrap{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:28px 56px;align-items:center}
@media (max-width:900px){.optt-band.has-stage .wrap{grid-template-columns:1fr}.optt-band{padding:32px 0 28px!important}}
.optt-hero__text .band__title{margin:0 0 16px;font-size:clamp(32px,3.5vw,50px);line-height:1.06}
.optt-hero__lead{margin:0 0 28px;max-width:540px;font-size:20px;line-height:1.5;color:var(--muted,#59627d)}
.optt-hero__lead strong{color:var(--ink,#0e1330);font-weight:600}
.optt-hero__cta{display:flex;flex-wrap:wrap;align-items:center;gap:12px 18px;margin:0}
.optt-hero__cta .btn{min-height:52px;padding-left:28px;padding-right:28px}
.optt-hero__cta span{font-size:14px;color:var(--muted,#59627d)}
.optt-hero__stage{background:#fff;border-radius:24px;padding:30px 26px 24px;box-shadow:0 1px 3px rgba(14,19,48,.06),0 22px 60px rgba(14,19,48,.10)}
.optt-hero__row{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px 18px;align-items:end}
.optt-hero__shot{margin:0;text-align:center;animation:opttRise .7s cubic-bezier(.2,.7,.2,1) both;animation-delay:calc(var(--i) * 90ms)}
.optt-hero__shot img{display:block;width:100%;height:150px;object-fit:contain;mix-blend-mode:multiply;transition:transform .25s}
.optt-hero__shot:hover img{transform:translateY(-5px)}
.optt-hero__shot figcaption{margin-top:10px;padding-top:9px;border-top:1px solid var(--rule,#dce0ea);font:600 11.5px var(--mono,monospace);letter-spacing:.08em;text-transform:uppercase;color:var(--muted,#59627d)}
@media (max-width:600px){.optt-hero__shot img{height:90px}.optt-hero__stage{padding:20px 14px 16px}.optt-hero__row{gap:16px 10px}.optt-hero__shot figcaption{font-size:10px}}
@keyframes opttRise{from{opacity:0;transform:translateY(26px)}}
@media (prefers-reduced-motion:reduce){.optt-hero__shot{animation:none}}

/* questions */
.optt__q{display:grid;grid-template-columns:1fr 1fr;gap:16px;background:var(--ti);border-radius:20px;padding:20px}
@media (max-width:760px){.optt__q{grid-template-columns:1fr;padding:12px;gap:12px}}
.optt__qcard{background:#fff;border-radius:16px;padding:20px 22px 22px;box-shadow:0 1px 3px rgba(14,19,48,.06),0 8px 24px rgba(14,19,48,.05)}
.optt__qcard--wide{grid-column:1/-1}
.optt__qhead{display:flex;align-items:center;gap:12px;margin:0 0 16px;font-weight:700;font-size:17px;line-height:1.3}
.optt__qhead span{display:grid;place-items:center;flex:none;width:28px;height:28px;border-radius:50%;background:var(--b);color:#fff;font-size:14px}
.optt__qsub{margin:-10px 0 14px 40px;font-size:13.5px;color:var(--mu)}
.optt__nums{display:flex;flex-wrap:wrap;gap:16px 28px}
.optt__num{display:flex;flex-direction:column;gap:6px}
.optt__num>small{font-size:13px;color:var(--mu);font-weight:600}
.optt__num div{display:flex;align-items:center;border:1.5px solid var(--ru);border-radius:12px;overflow:hidden;width:max-content}
.optt .optt__num button{width:44px;height:50px;font-size:22px;color:var(--b);background:var(--ti)}
.optt .optt__num button:hover{background:#dfe3f3}
.optt__num input{width:96px;height:50px;border:0;padding:0;text-align:center;font:700 20px var(--mo);color:var(--ink2);background:#fff}
.optt__num input:focus{outline:0;background:#f4f6ff}
.optt__tiles{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px}
.optt button.optt__tile{position:relative;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;min-height:58px;padding:12px 30px;border:1.5px solid var(--ru);border-radius:14px;background:#fff;text-align:center;transition:border-color .15s,box-shadow .15s,transform .15s}
.optt button.optt__tile:hover{border-color:var(--b);transform:translateY(-1px);box-shadow:0 4px 14px rgba(30,47,160,.12)}
.optt button.optt__tile.is-on{border-color:var(--b);background:#f4f6ff;box-shadow:inset 0 0 0 1px var(--b)}
.optt button.optt__tile.is-on::after{content:"\2713";position:absolute;top:6px;right:6px;width:20px;height:20px;border-radius:50%;background:var(--b);color:#fff;font-size:12px;line-height:20px;font-weight:700}
.optt__tile strong{font-size:15px;line-height:1.25}
.optt__tile small{font-size:13px;color:var(--mu)}
@media (max-width:520px){.optt__tiles{grid-template-columns:1fr;gap:8px}.optt button.optt__tile{min-height:48px}}

/* result */
.optt__res{margin-top:24px;background:var(--ti);border-radius:20px;padding:24px 20px 20px}
@media (max-width:760px){.optt__res{padding:18px 12px 12px}}
.optt__head{padding:0 4px 4px}
.optt__head .optt__pos{margin-bottom:6px}
.optt .optt__head h3{margin:0;font-size:clamp(24px,2.6vw,32px);line-height:1.15}
.optt__big{font-family:var(--mo);color:var(--b);white-space:nowrap}
.optt__card{background:#fff;border-radius:16px;padding:20px 22px;margin-top:16px;box-shadow:0 1px 3px rgba(14,19,48,.06),0 8px 24px rgba(14,19,48,.05)}
@media (max-width:760px){.optt__card{padding:16px}}
.optt__grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.optt__grid>.optt__card{margin-top:16px}
@media (max-width:760px){.optt__grid{grid-template-columns:1fr;gap:0}}
.optt__stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px}
.optt__stat{padding:14px 16px;border-radius:14px;background:var(--ti)}
.optt__stat b{display:block;font:700 22px/1.2 var(--mo);color:var(--b);white-space:nowrap}
.optt__stat span{display:block;color:var(--mu);font-size:13.5px;margin-top:4px}
.optt__stat.is-in{background:#f4f6ff;box-shadow:inset 0 0 0 1.5px var(--b)}
.optt__line{display:flex;flex-wrap:wrap;justify-content:space-between;gap:4px 16px;padding:10px 0;border-bottom:1px solid var(--ru);align-items:baseline}
.optt__line:last-child{border-bottom:0}
.optt__line span{color:var(--mu);flex:1 1 150px}
.optt__line b{font:700 17px var(--mo);white-space:nowrap;margin-left:auto}
.optt__fine{margin:12px 0 0;font-size:14px;line-height:1.5;color:var(--mu)}
.optt__warn{margin:12px 0 0;padding:10px 14px;border-radius:10px;background:#fdf2e2;color:#8a5200;font-size:14px;line-height:1.45}
.optt__err{margin:0;padding:12px 14px;border-radius:10px;background:#fdecec;color:var(--bad)}
.optt__table{width:100%;border-collapse:collapse;font-size:14.5px}
.optt__table th{font:600 11.5px var(--mo);letter-spacing:.06em;text-transform:uppercase;color:var(--mu);text-align:left;padding:8px 10px;border-bottom:1.5px solid var(--ru)}
.optt__table td{padding:8px 10px;border-bottom:1px solid var(--ru);font-family:var(--mo);white-space:nowrap}
.optt__table tr.is-on td{background:#f4f6ff;color:var(--b);font-weight:700}
.optt__scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}

/* instruments + end */
.optt__cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px}
.optt__prod{display:flex;align-items:center;gap:12px;padding:10px 14px 10px 10px;border:1.5px solid var(--ru);border-radius:14px;background:#fff;color:inherit;text-decoration:none;transition:border-color .15s,box-shadow .15s}
.optt__prod:hover{border-color:var(--b);box-shadow:0 4px 14px rgba(30,47,160,.10)}
.optt__prod img{flex:none;width:72px;height:72px;object-fit:contain;mix-blend-mode:multiply}
.optt__prod em{display:block;font:600 11px var(--mo);font-style:normal;letter-spacing:.08em;text-transform:uppercase;color:var(--b)}
.optt__prod strong{display:block;font-size:14.5px;line-height:1.25;margin-top:2px}
.optt__prod small{display:block;font-size:13px;line-height:1.35;color:var(--mu);margin-top:3px}
.optt__end{display:grid;grid-template-columns:1fr auto;gap:12px 28px;align-items:center;margin-top:16px;padding-top:16px;border-top:1px solid var(--ru)}
@media (max-width:760px){.optt__end{grid-template-columns:1fr}.optt__end .btn{width:100%}}
.optt__end p{margin:0;line-height:1.5}
.optt__end .btn{min-height:52px}
.optt__note{font-size:13.5px;color:var(--mu);margin:14px 4px 0;line-height:1.5}

/* power cross (transposition and vertex) */
.optt__crosses{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media (max-width:520px){.optt__crosses{grid-template-columns:1fr}}
.optt__cross{text-align:center}
.optt__cross svg{display:block;width:100%;max-width:300px;height:auto;margin:0 auto}
.optt__cross figcaption{font:600 11.5px var(--mo);letter-spacing:.08em;text-transform:uppercase;color:var(--mu);margin-top:6px}
.optt button.optt__use{margin-left:6px;padding:4px 12px;border:1.5px solid var(--b);border-radius:999px;color:var(--b);font-size:13px;font-weight:600;background:#fff}
.optt button.optt__use:hover{background:#f4f6ff}

/* The tools as one set (0.17.0): overview cards in groups + "More tools" under each tool page. Outside .optt, so the
   theme's own colour tokens are used directly. */
.optt-hub__group{margin:44px 0 0}
.optt-hub__group:first-child{margin-top:0}
.optt-hub__group h2{margin:0 0 4px}
.optt-hub__sub{margin:0 0 18px;color:var(--muted,#59627d)}
.optt-hub__grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:16px}
.optt-hubc{display:flex;flex-direction:column;gap:14px;padding:22px;border:1.5px solid var(--rule,#dce0ea);border-radius:16px;background:#fff;color:var(--ink,#0e1330);text-decoration:none;box-shadow:0 1px 3px rgba(14,19,48,.06),0 8px 24px rgba(14,19,48,.05);transition:border-color .15s,transform .15s,box-shadow .15s}
.optt-hubc:hover{border-color:var(--brand,#1e2fa0);transform:translateY(-2px);box-shadow:0 10px 28px rgba(30,47,160,.12)}
.optt-hubc__icon{display:grid;place-items:center;width:52px;height:52px;border-radius:14px;background:var(--tint,#eef0f8);color:var(--brand,#1e2fa0)}
.optt-hubc__icon svg{width:28px;height:28px;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.optt-hubc__text{display:flex;flex-direction:column;gap:6px;flex:1}
.optt-hubc strong{font-size:18px;line-height:1.25}
.optt-hubc small{font-size:14.5px;line-height:1.45;color:var(--muted,#59627d)}
.optt-hubc em{margin-top:auto;padding-top:6px;font:600 12.5px var(--mono,monospace);font-style:normal;letter-spacing:.06em;text-transform:uppercase;color:var(--brand,#1e2fa0)}
.optt-hubc__draft{display:inline-block;margin-left:8px;padding:2px 8px;border-radius:999px;background:#fdf2e2;color:#8a5200;font:600 11px var(--mono,monospace);text-transform:uppercase;vertical-align:middle}
.optt-hubc--small{flex-direction:row;align-items:center;gap:12px;padding:14px 16px}
.optt-hubc--small .optt-hubc__icon{flex:none;width:42px;height:42px;border-radius:12px}
.optt-hubc--small .optt-hubc__icon svg{width:24px;height:24px}
.optt-hubc--small strong{font-size:15.5px}
.optt-hubc--small em{padding-top:0;font-size:11.5px}
.optt-more{margin:56px 0 0;padding-top:28px;border-top:1px solid var(--rule,#dce0ea)}
.optt-more h2{margin:0 0 16px}
.optt-more__grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px}
.optt-more__all{margin:16px 0 0}
.optt-more__all a{font-weight:600}

/* Retinoscopy calculator (0.18.0): meridian rows, patient details, result bar, share row, browser printout. */
.optt__mer{align-items:flex-end;margin-top:14px}
.optt__mer:first-of-type{margin-top:0}
.optt__merlab{flex:1 0 100%;font-weight:600;font-size:14.5px;margin-bottom:-6px}
.optt__patient summary{cursor:pointer;font-weight:700;font-size:16px}
.optt__patient summary small{font-weight:400;color:var(--mu)}
.optt__pgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:14px}
@media (max-width:760px){.optt__pgrid{grid-template-columns:1fr}}
.optt__pgrid label{display:flex;flex-direction:column;gap:6px;font-size:13px;font-weight:600;color:var(--mu)}
.optt__pgrid input,.optt__pgrid textarea{padding:10px 12px;border:1.5px solid var(--ru);border-radius:10px;font:inherit;font-size:15px;color:var(--ink2)}
.optt__pnotes{grid-column:1/-1}
.optt__bar{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px}
.optt__tiles--inline{display:flex;flex-wrap:wrap;gap:10px}
.optt__tiles--inline .optt__tile{min-height:46px;padding:10px 34px 10px 18px}
.optt__acts{display:flex;align-items:center;gap:12px}
.optt__acts .btn[disabled]{opacity:.5;cursor:default}
.optt__share{display:flex;flex-wrap:wrap;align-items:center;gap:10px 16px;margin-top:16px;padding-top:14px;border-top:1px solid var(--ru);font-size:14px}
.optt__share span{color:var(--mu);font-family:var(--mo);font-size:12px;letter-spacing:.08em;text-transform:uppercase}
.optt__share a{font-weight:600}
.optt-print{display:none}
@media print{
	body *{visibility:hidden!important}
	.optt-print,.optt-print *{visibility:visible!important}
	.optt-print{display:block!important;position:absolute;left:0;top:0;width:100%;padding:24px;color:#000;font:14px/1.5 sans-serif}
	.optt-print h2{margin:0 0 10px;font-size:20px}
	.optt-print table{width:100%;border-collapse:collapse;margin:12px 0}
	.optt-print th,.optt-print td{border:1px solid #999;padding:6px 8px;text-align:left}
	.optt-print__foot{margin-top:24px;font-size:12px;color:#444}
}