/* Verre Clair — optics-lab stylesheet. Hand-written, no framework. */
:root {
  --bg: #F1F7F8;
  --pane: #FFFFFF;
  --ink: #0D2A30;
  --ink-2: #33545B;
  --aqua: #0A7F8C;
  --aqua-deep: #075E68;
  --aqua-edge: #7FD6DE;
  --aqua-mist: #DDF1F3;
  --alert: #C8102E;
  --alert-mist: #FBEAED;
  --show: 'Jomhuria', 'Almarai', system-ui, sans-serif;
  --display: 'Almarai', 'Segoe UI', system-ui, sans-serif;
  --body: 'Almarai', 'Segoe UI', system-ui, sans-serif;
  --r: 18px;
  --edge: 1px solid rgba(10, 127, 140, .32);
  --lift: 0 1px 0 rgba(255,255,255,.9) inset, 0 18px 40px -24px rgba(13, 42, 48, .35);
  --wrap: 1180px;
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 400 1.125rem/1.85 var(--body);
  overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--aqua-deep); text-underline-offset: .18em; text-decoration-thickness: 1px; }
a:hover { color: var(--ink); }
:focus-visible { outline: 3px solid var(--aqua); outline-offset: 3px; border-radius: 6px; }
h1, h2, h3 { font-family: var(--display); color: var(--ink); line-height: 1.35; margin: 0 0 .6em; }
h1 { font-family: var(--show); font-weight: 400; font-size: clamp(3.2rem, 8.4vw, 6rem); line-height: .95; }
h2 { font-family: var(--show); font-weight: 400; font-size: clamp(2.4rem, 5vw, 3.6rem); line-height: 1; }
h3 { font-weight: 700; font-size: 1.2rem; }
p { margin: 0 0 1em; }
.wrap { width: min(var(--wrap), 100% - 2.5rem); margin-inline: auto; }
.skip { position: absolute; inset-inline-start: -999px; top: 0; background: var(--ink); color: #fff; padding: .6rem 1rem; z-index: 50; }
.skip:focus { inset-inline-start: 1rem; top: 1rem; color: #fff; }

/* Small lab labels (utility register) */
.tag {
  display: inline-flex; align-items: center; gap: .45rem;
  font: 600 .74rem/1 var(--display); color: var(--aqua-deep);
}
.tag::before { content: ""; width: 1.4rem; height: 1px; background: currentColor; }
.tag--alert { color: var(--alert); }

/* ---------- Header ---------- */
.top { position: sticky; top: 0; z-index: 30; background: rgba(241, 247, 248, .86); border-bottom: var(--edge); }
@supports (backdrop-filter: blur(1px)) { .top { backdrop-filter: blur(14px) saturate(1.3); background: rgba(241, 247, 248, .7); } }
.top .wrap { display: flex; align-items: center; justify-content: space-between; gap: 1rem; min-height: 64px; flex-wrap: wrap; }
.brand { display: inline-flex; align-items: center; gap: .6rem; text-decoration: none; color: var(--ink); }
.brand svg { width: 38px; height: 38px; flex: none; }
.brand span { font: 400 2.3rem/1 var(--show); }
.brand b { font-weight: 400; color: var(--aqua-deep); }
.menu-btn {
  display: none; font: 600 .85rem/1 var(--display);
  background: var(--pane); color: var(--ink); border: var(--edge); border-radius: 999px; padding: .65rem 1rem; cursor: pointer;
}
.nav ul { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: .25rem .4rem; }
.nav a {
  display: block; padding: .45rem .8rem; border-radius: 999px; text-decoration: none; color: var(--ink);
  font: 600 .92rem/1.2 var(--display);
}
.nav a:hover { background: var(--aqua-mist); }
.nav a[aria-current="page"] { background: var(--pane); box-shadow: inset 0 0 0 1px var(--aqua); }
@media (max-width: 880px) {
  .js .menu-btn { display: inline-block; }
  .js .nav { display: none; width: 100%; padding-bottom: .8rem; }
  .js .nav.is-open { display: block; }
  .js .nav ul { flex-direction: column; }
  .nav a { padding: .7rem .8rem; }
  .nav ul { width: 100%; }
}

/* ---------- Glass panes ---------- */
.pane {
  position: relative; background: rgba(255, 255, 255, .94); border: var(--edge); border-radius: var(--r);
  box-shadow: var(--lift); padding: clamp(1.4rem, 4vw, 3rem);
}
@supports (backdrop-filter: blur(1px)) {
  .pane { background: rgba(255, 255, 255, .8); backdrop-filter: blur(18px) saturate(1.2); }
}
.pane::after { /* bevelled aqua edge on the top-right (RTL start) */
  content: ""; position: absolute; inset: -1px; border-radius: inherit; pointer-events: none;
  background: linear-gradient(225deg, rgba(127, 214, 222, .55), transparent 22%, transparent 78%, rgba(127, 214, 222, .35));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0); -webkit-mask-composite: xor;
  mask: linear-gradient(#000 0 0) content-box exclude, linear-gradient(#000 0 0); padding: 2px;
}
.bench { background: var(--bg) url(../img/bg-caustics-1600.webp) center top / cover no-repeat; padding-top: 2.5rem; border-top: var(--edge); }
@media (max-width: 700px) { .bench { background-image: url(../img/bg-caustics-900.webp); } }
.stack { display: grid; gap: 0; padding-bottom: 3rem; }
.stack > .pane { margin-top: -2.2rem; padding-top: clamp(3.4rem, 6vw, 4.6rem); }
.stack > .pane:first-child { margin-top: 0; }
@media (min-width: 900px) {
  .stack > .pane:nth-child(odd) { margin-inline-end: 3.5rem; }
  .stack > .pane:nth-child(even) { margin-inline-start: 3.5rem; }
}
.depth-tag {
  position: absolute; top: 1.1rem; inset-inline-end: 1.3rem; font: 600 .72rem/1 var(--display); color: var(--ink-2);
}

/* ---------- Hero / paillasse ---------- */
.hero { padding: clamp(2rem, 5vw, 4rem) 0 4.5rem; }
.hero-grid { display: grid; gap: 2rem; align-items: center; }
@media (min-width: 980px) { .hero-grid { grid-template-columns: 1.02fr 1fr; gap: 3rem; } }
.hero h1 { margin-top: .9rem; }
.hero h1 em { font-style: normal; font-weight: 600; color: var(--aqua-deep); }
.lead { font-size: 1.15rem; color: var(--ink-2); max-width: 36em; }
.hero-figure { position: relative; margin: 0; border-radius: 26px; overflow: hidden; border: var(--edge); box-shadow: var(--lift); background: #fff; }
.hero-figure img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; }
.hero-figure figcaption {
  position: absolute; inset-inline: .9rem; bottom: .9rem; background: rgba(255,255,255,.93); border-radius: 12px;
  padding: .55rem .8rem; font-size: .85rem; color: var(--ink); border: var(--edge);
}
.answer {
  margin-top: 1.6rem; border-radius: 16px; padding: 1.1rem 1.25rem; max-width: 40em;
  background: linear-gradient(170deg, #fff 0%, rgba(255,255,255,.94) 55%, rgba(221,241,243,.95) 100%);
  box-shadow: inset 0 1px 0 #fff, inset 0 0 0 1px rgba(10,127,140,.3), 0 14px 30px -22px rgba(13,42,48,.45);
}
.answer p { margin: .4rem 0 0; }
.vials { list-style: none; padding: 0; margin: 2.4rem 0 0; display: grid; gap: 1rem; }
@media (min-width: 720px) { .vials { grid-template-columns: repeat(3, 1fr); } }
.vials li {
  background: rgba(255,255,255,.92); border: var(--edge); border-radius: 999px 999px 18px 18px; padding: 1.3rem 1.2rem 1.1rem; text-align: center;
}
.vials b { display: block; font: 400 3.6rem/.9 var(--show); color: var(--aqua-deep); margin: .3rem 0 .4rem; }
.vials span { font: 600 .78rem/1.2 var(--display); }
.vials small { display: block; color: var(--ink-2); font-size: .88rem; line-height: 1.45; }

/* ---------- Inspector ---------- */
.inspect-grid { display: grid; gap: 2rem; }
@media (min-width: 960px) { .inspect-grid { grid-template-columns: minmax(0, 420px) 1fr; align-items: start; } }
.specimen {
  position: relative; border-radius: 22px; padding: 1.4rem; aspect-ratio: 4 / 5; max-width: 420px; width: 100%;
  background: linear-gradient(160deg, #fff 0%, var(--aqua-mist) 100%); border: 1px solid var(--aqua-edge); box-shadow: var(--lift);
  display: grid; grid-template-rows: auto 1fr auto; overflow: hidden;
}
.specimen::before { /* glass glare */
  content: ""; position: absolute; inset: -30% -30% 40% 40%; background: linear-gradient(240deg, rgba(255,255,255,.9), transparent 60%);
  transform: rotate(-8deg); pointer-events: none;
}
.specimen-head { font: 600 .74rem/1 var(--display); color: var(--ink-2); }
.sticker { position: relative; margin: 1rem 0; display: grid; grid-template-rows: repeat(5, 1fr); border-radius: 14px; overflow: hidden; border: 1px dashed var(--aqua); }
.band { position: relative; display: flex; align-items: center; padding: 0 1rem; font: 600 .95rem/1.2 var(--display); color: var(--alert); background: #fff; }
.band + .band { border-top: 1px dashed rgba(200, 16, 46, .35); }
.band span::before { content: "▲"; font-size: .7em; vertical-align: .15em; margin-inline-end: .4em; }
.label-face {
  position: absolute; inset: 0; display: grid; place-content: center; text-align: center; padding: 1rem;
  background: linear-gradient(180deg, var(--aqua) 0%, var(--aqua-deep) 100%); color: #fff; pointer-events: none;
  clip-path: inset(var(--peel, 0%) 0 0 0); transition: clip-path .6s cubic-bezier(.2,.7,.2,1);
}
.label-face strong { font: 400 clamp(3.2rem, 9vw, 4.4rem)/1 var(--show); }
.label-face small { font: 600 .8rem/1.3 var(--display); }
.label-face em { font-style: normal; display: block; margin-top: .7rem; font-size: .9rem; }
.specimen-foot { font-size: .82rem; color: var(--ink-2); }
.no-js-note { font-size: .9rem; color: var(--ink-2); }
.js .no-js-note { display: none; }
.chips { display: flex; flex-wrap: wrap; gap: .55rem; margin: 0 0 1.2rem; padding: 0; list-style: none; }
.chip {
  font: 600 .95rem/1 var(--display); padding: .75rem 1.05rem; border-radius: 999px; cursor: pointer;
  background: var(--pane); color: var(--ink); border: 1px solid var(--aqua); transition: background .2s, color .2s;
}
.chip:hover { background: var(--aqua-mist); }
.chip[aria-pressed="true"] { background: var(--ink); color: #fff; border-color: var(--ink); }
.chip.is-seen::after { content: "✓"; margin-inline-start: .35em; }
.chips-wrap { display: none; }
.js .chips-wrap { display: block; }
.layer { border-top: 1px solid rgba(200, 16, 46, .3); padding: 1.1rem 0 .4rem; }
.layer h3 { margin: .5rem 0 .4rem; }
.layer .ask { background: var(--alert-mist); border-radius: 10px; padding: .7rem .9rem; color: var(--ink); }
.layer .ask b { color: var(--alert); }
.js .layer { display: none; }
.layer-empty { display: none; }
.js .layer-empty { display: block; border: 1px dashed var(--aqua); border-radius: 14px; padding: 1.2rem; color: var(--ink-2); background: rgba(255,255,255,.7); }
.js .layers.touched .layer-empty, .js .layers.all .layer-empty { display: none; }
.js .layer.is-current, .js .layers.all .layer { display: block; }
.js .layer.is-current { animation: rise .35s ease-out; }
@keyframes rise { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
.meter-row { display: flex; flex-wrap: wrap; align-items: center; gap: .8rem 1.2rem; margin-top: 1.2rem; }
.meter { display: flex; gap: 4px; }
.meter i { width: 26px; height: 8px; border-radius: 4px; background: var(--aqua-mist); border: 1px solid var(--aqua-edge); }
.meter i.on { background: var(--alert); border-color: var(--alert); }
.btn {
  display: inline-flex; align-items: center; gap: .5rem; font: 600 .95rem/1 var(--display);
  padding: .85rem 1.3rem; border-radius: 999px; border: 1px solid var(--ink); background: transparent; color: var(--ink); cursor: pointer; text-decoration: none;
}
.btn:hover { background: var(--ink); color: #fff; }

/* ---------- Five layers ---------- */
.layers-five { list-style: none; margin: 1.5rem 0 0; padding: 0; display: grid; gap: 0; }
.lens-row {
  display: grid; grid-template-columns: 1fr; gap: .2rem 1.6rem; padding: 1.1rem 0; border-top: 1px solid rgba(10,127,140,.22);
}
@media (min-width: 760px) { .lens-row { grid-template-columns: 11rem 1fr; } }
.lens-row h3 { font-weight: 700; font-size: 1.3rem; margin: 0; color: var(--alert); }
.lens-row p { margin: 0; }
.layer-art { display: grid; grid-template-columns: repeat(3, 1fr); gap: .8rem; margin-top: 1.8rem; }
.layer-art img { border-radius: 14px; border: var(--edge); background: #fff; }

/* ---------- Checklist ---------- */
.clear-list { list-style: none; padding: 0; margin: 0 0 1.2rem; display: grid; gap: .6rem; }
@media (min-width: 760px) { .clear-list { grid-template-columns: 1fr 1fr; } }
.clear-list li { position: relative; padding-block: .8rem; padding-inline: 3rem 1rem; background: rgba(241,247,248,.7); border-radius: 12px; border: var(--edge); }
.clear-list li::before {
  content: ""; position: absolute; inset-inline-start: 1rem; top: 1.25rem; width: 1.15rem; height: 1.15rem; border-radius: 50%;
  border: 2px solid var(--aqua); background: radial-gradient(circle at 35% 35%, #fff 0 30%, var(--aqua-edge) 31% 100%);
}
.note {
  border-radius: 14px; padding: 1rem 1.2rem; background: var(--aqua-mist); border: var(--edge); margin: 1rem 0;
}
.note h3, .note .note-title { font: 600 1rem/1.3 var(--display); margin: 0 0 .3rem; }
.note p { margin: 0; }

/* ---------- Prism diagram ---------- */
.prism { display: grid; gap: 1.2rem; margin: 1.2rem 0; align-items: center; }
@media (min-width: 860px) { .prism { grid-template-columns: 300px 1fr; } }
.prism svg { width: 100%; max-width: 300px; height: auto; }
.rays { list-style: none; margin: 0; padding: 0; display: grid; gap: .5rem; counter-reset: ray; }
.rays li { position: relative; padding-block: .55rem; padding-inline: 2.4rem .8rem; border: var(--edge); background: linear-gradient(270deg, var(--aqua-mist), #fff 38%); border-radius: 10px; }
.rays li::before { counter-increment: ray; content: counter(ray); position: absolute; inset-inline-start: .8rem; top: .55rem; font: 700 .95rem/1.85 var(--display); color: var(--alert); }
.sample {
  margin: 1.2rem 0; padding: 1.1rem 1.25rem; border-radius: 14px; border: 1px dashed var(--aqua); background: #fff;
}
.sample .tag { margin-bottom: .5rem; }
.sample h3 { font-size: 1.05rem; margin: .2rem 0 .4rem; }
.sample p { margin: 0; }

/* ---------- Promo: etched glass plate ---------- */
.plaque { margin: 1.6rem 0; position: relative; border-radius: 22px; overflow: hidden; border: 1px solid var(--aqua-edge); background: #EAF6F7; box-shadow: var(--lift); }
.plaque-art { position: absolute; inset: 0; }
.plaque-art img { width: 100%; height: 100%; object-fit: cover; }
.plaque-body { position: relative; padding: clamp(1.2rem, 4vw, 2.4rem); display: grid; gap: 1rem; }
.plaque-kicker { justify-self: start; background: rgba(255,255,255,.94); border-radius: 999px; padding: .45rem .8rem; }
.etch {
  background: rgba(255,255,255,.9); border-top: 2px solid #fff; border-bottom: 2px solid var(--aqua-edge);
  border-radius: 6px; padding: 1.1rem 1.2rem; text-align: center;
}
@supports (backdrop-filter: blur(1px)) { .etch { background: rgba(255,255,255,.82); backdrop-filter: blur(10px); } }
.etch p { margin: 0; }
.etch .code {
  font: 400 clamp(2.4rem, 6vw, 3.4rem)/1 var(--show); color: var(--aqua-deep);
  text-shadow: 0 1px 0 #fff, 0 -1px 0 rgba(13,42,48,.15);
}
.etch .sub { margin-top: .5rem; color: var(--ink); font-size: .95rem; }
.plaque-foot { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: .8rem; background: rgba(255,255,255,.94); border-radius: 14px; padding: .8rem 1rem; }
.under { margin: 0; font-size: .9rem; color: var(--ink); }
.under b { color: var(--alert); font-family: var(--display); font-size: .85rem; margin-inline-end: .5rem; }
.pill {
  display: inline-flex; align-items: center; gap: .5rem; text-decoration: none; color: var(--ink); font: 600 .95rem/1 var(--display);
  padding: .8rem 1.25rem; border-radius: 999px; border: 1px solid var(--aqua); background: linear-gradient(180deg, #fff, var(--aqua-mist));
  box-shadow: 0 1px 0 #fff inset, 0 6px 16px -8px rgba(10,127,140,.6);
}
.pill:hover { color: var(--ink); background: #fff; }

/* ---------- Protocol cards ---------- */
.protocols { display: grid; gap: 1.1rem; margin-top: 1.5rem; }
@media (min-width: 860px) { .protocols { grid-template-columns: repeat(3, 1fr); } }
.protocol { display: flex; flex-direction: column; text-decoration: none; color: var(--ink); background: #fff; border: var(--edge); border-radius: 18px; overflow: hidden; transition: transform .25s, box-shadow .25s; }
.protocol:hover { transform: translateY(-3px); box-shadow: var(--lift); color: var(--ink); }
.protocol .crop { display: block; overflow: hidden; aspect-ratio: 4 / 3; }
.protocol .crop img { width: 100%; height: 100%; object-fit: cover; transform: scale(2.6); }
.protocol div { padding: 1rem 1.1rem 1.2rem; }
.protocol h3 { font-weight: 700; font-size: 1.1rem; line-height: 1.6; margin: .5rem 0 0; }

/* ---------- FAQ tubes ---------- */
.tubes { display: grid; gap: .7rem; }
.tube { border: var(--edge); border-start-start-radius: 999px; border-end-start-radius: 999px; border-start-end-radius: 18px; border-end-end-radius: 18px; background: #fff; overflow: hidden; }
.tube[open] { border-start-start-radius: 26px; border-end-start-radius: 26px; }
.tube summary {
  list-style: none; cursor: pointer; padding-block: .95rem; padding-inline: 3.2rem 1.2rem; position: relative; font: 700 1.02rem/1.6 var(--display);
}
.tube summary::-webkit-details-marker { display: none; }
.tube summary::before {
  content: ""; position: absolute; inset-inline-start: 1.1rem; top: 50%; width: 1.3rem; height: .55rem; margin-top: -.28rem; border-radius: 999px;
  border: 1.5px solid var(--aqua); background: linear-gradient(270deg, var(--aqua-edge) 0 30%, transparent 30%); transition: background .3s;
}
.tube[open] summary::before { background: linear-gradient(270deg, var(--aqua-edge) 0 100%, transparent 100%); }
.tube > div { padding-block: 0 1.1rem; padding-inline: 3.2rem 1.4rem; color: var(--ink-2); }
.tube > div p { margin: 0; color: var(--ink); }

/* ---------- Depth indicator (home) ---------- */
.depth { position: fixed; left: 14px; top: 50%; transform: translateY(-50%); z-index: 20; display: none; }
@media (min-width: 1300px) { .depth { display: block; } }
.depth ol { list-style: none; margin: 0; padding: .6rem .5rem; display: grid; gap: .35rem; background: rgba(255,255,255,.9); border: var(--edge); border-radius: 999px; }
.depth a { display: block; width: 26px; height: 26px; border-radius: 50%; text-decoration: none; position: relative; }
.depth a::before { content: ""; position: absolute; inset: 9px; border-radius: 50%; border: 1.5px solid var(--aqua); background: #fff; transition: inset .2s, background .2s; }
.depth a.is-here::before { inset: 5px; background: var(--aqua); }
.depth a span { position: absolute; left: 34px; top: 50%; transform: translateY(-50%); white-space: nowrap; font: 600 .78rem/1 var(--display); background: var(--ink); color: #fff; padding: .35rem .55rem; border-radius: 6px; opacity: 0; pointer-events: none; transition: opacity .2s; }
.depth a:hover span, .depth a:focus-visible span { opacity: 1; }

/* ---------- Guides: lame layout ---------- */
.guide-head { padding: clamp(1.6rem, 4vw, 3rem) 0 2rem; display: grid; gap: 2rem; align-items: end; }
@media (min-width: 980px) { .guide-head { grid-template-columns: 1.15fr .85fr; } }
.guide-head h1 { font-size: clamp(2.8rem, 6vw, 4.6rem); margin-top: .8rem; }
.vessel { margin: 0; border-radius: 22px; overflow: hidden; border: var(--edge); background: #fff; }
.vessel img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; transform: scale(2.6); }
.toc { display: flex; flex-wrap: wrap; gap: .4rem; list-style: none; padding: 0; margin: 1.2rem 0 0; }
.toc a { display: block; font: 600 .85rem/1.2 var(--display); padding: .45rem .75rem; border-radius: 999px; border: var(--edge); background: #fff; text-decoration: none; color: var(--ink); }
.toc a:hover { border-color: var(--aqua); }
.lames { padding-bottom: 2rem; }
.lame { display: grid; gap: 1rem 0; padding: 2.4rem 0; border-top: 1px solid rgba(10,127,140,.2); position: relative; }
@media (min-width: 900px) {
  .lame { grid-template-columns: 1fr 2.2fr; }
  .lame-claim { padding-inline-end: 3rem; position: relative; }
  .lame-claim::after { /* refraction line joining claim and condition */
    content: ""; position: absolute; top: 2.2rem; inset-inline-end: 0; width: 2.4rem; height: 1px;
    background: linear-gradient(270deg, var(--aqua-edge), var(--aqua));
  }
  .lame-body { border-inline-start: 1px solid var(--aqua-edge); padding-inline-start: 2rem; }
}
.lame-claim h2 { font-size: clamp(2.1rem, 3.6vw, 2.8rem); margin-top: .6rem; }
.lame-body > :last-child { margin-bottom: 0; }
.lame-body ul, .lame-body ol { padding-inline-start: 1.4rem; }
.lame-body li { margin-bottom: .45rem; }
.lame-body li::marker { color: var(--aqua); }
.sheet-wrap { overflow-x: auto; margin: 1rem 0 1.4rem; border-radius: 14px; border: var(--edge); background: #fff; }
.sheet { border-collapse: collapse; width: 100%; font-size: .94rem; min-width: 520px; }
.sheet caption { text-align: start; padding: .8rem 1rem; font: 600 .82rem/1.3 var(--display); color: var(--ink-2); caption-side: top; }
.sheet th, .sheet td { padding: .7rem 1rem; text-align: start; vertical-align: top; text-align: start; border-top: 1px solid rgba(10,127,140,.18); }
.sheet thead th { font: 600 .82rem/1.3 var(--display); background: var(--aqua-mist); }
.sheet tbody th { font-weight: 700; }
.protocol-steps { list-style: none; padding: 0 !important; margin: 1rem 0; display: grid; gap: .7rem; counter-reset: st; }
.protocol-steps li { counter-increment: st; display: grid; grid-template-columns: 2.6rem 1fr; gap: .2rem .9rem; background: #fff; border: var(--edge); border-radius: 14px; padding: .9rem 1rem; margin: 0 !important; }
.protocol-steps li::before { content: counter(st); grid-row: span 2; width: 2.4rem; height: 2.4rem; border-radius: 50%; display: grid; place-items: center; border: 1.5px solid var(--aqua); font: 300 1.2rem/1 var(--display); color: var(--aqua-deep); }
.protocol-steps b { font-family: var(--display); font-weight: 600; }
.protocol-steps span { color: var(--ink-2); }
.others { display: grid; gap: 1rem; padding: 1rem 0 3rem; }
@media (min-width: 760px) { .others { grid-template-columns: 1fr 1fr; } }

/* ---------- Simple pages ---------- */
.page-head { padding: clamp(1.6rem, 4vw, 3rem) 0 1.6rem; max-width: 52rem; }
.page-head h1 { font-size: clamp(2.9rem, 6.6vw, 4.8rem); margin-top: .8rem; }
.page-body { padding-bottom: 3.5rem; }
.page-body .pane h2 { font-size: clamp(2.1rem, 3.8vw, 2.8rem); }
.page-body ul { padding-inline-start: 1.4rem; }
.page-body li { margin-bottom: .45rem; }
.page-body li::marker { color: var(--aqua); }
.empty-pane { min-height: 46vh; display: grid; place-content: center; text-align: center; }
.empty-pane .ghost { font: 400 clamp(6rem, 20vw, 12rem)/1 var(--show); color: transparent; -webkit-text-stroke: 1.5px var(--aqua); }

/* ---------- Footer ---------- */
.foot { background: var(--ink); color: #E3EEF0; padding: 3rem 0 2.2rem; margin-top: 2rem; }
.foot a { color: #9FE3EA; }
.foot a:hover { color: #fff; }
.foot-grid { display: grid; gap: 1.8rem; }
@media (min-width: 860px) { .foot-grid { grid-template-columns: 1.4fr 1fr 1fr; } }
.foot h2 { color: #fff; font: 600 .8rem/1 var(--display); margin-bottom: .9rem; }
.foot ul { list-style: none; padding: 0; margin: 0; display: grid; gap: .4rem; }
.age { direction: ltr; display: inline-grid; place-items: center; width: 3.2rem; height: 3.2rem; border-radius: 50%; border: 1.5px solid #9FE3EA; font: 600 1rem/1 var(--display); color: #fff; margin-bottom: .8rem; }
.foot p { font-size: .93rem; }
.foot .fine { border-top: 1px solid rgba(159, 227, 234, .25); margin-top: 2rem; padding-top: 1.2rem; font-size: .85rem; color: #C5D9DC; }

section[id], h2[id] { scroll-margin-top: 84px; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}
@media (max-width: 420px) {
  body { font-size: 1rem; }
  .pane { border-radius: 14px; }
  .layer-art { grid-template-columns: 1fr 1fr 1fr; gap: .4rem; }
}
@media (max-width: 719px) {
  .hero-figure figcaption { position: static; border: 0; border-top: var(--edge); border-radius: 0; }
  .vials li { border-radius: 60px 60px 16px 16px; padding: 1rem 1rem .9rem; }
  .vials b { font-size: 2.1rem; }
}
.lame > *, .hero-grid > *, .inspect-grid > *, .prism > *, .guide-head > * { min-width: 0; }
.chip, .btn, .pill, .menu-btn { min-height: 44px; }
.nav a { min-height: 40px; display: flex; align-items: center; }
.toc a { padding: .6rem .8rem; }
.tube summary { min-height: 48px; }

/* ---------- RTL / Arabic adjustments ---------- */
.tag { font-size: .82rem; line-height: 1.4; }
.lead { font-size: 1.2rem; line-height: 1.85; }
.hero h1 em { font-weight: 400; }
.depth-tag, .specimen-head, .vials span, .foot h2, .label-face small { font-size: .8rem; line-height: 1.4; }
.nav a, .chip, .btn, .pill, .menu-btn, .toc a { line-height: 1.4; }
.sheet thead th, .sheet caption { font-size: .88rem; line-height: 1.5; }
bdi { unicode-bidi: isolate; }