/* Layout concept: a quiet clinical reading column with one anatomical "atlas plate" as the signature element; figures carry captions like a surgical atlas. */
:root {
  --paper: #FAFBFA;      /* page ground, a cool sclera white */
  --wash: #EEF3F1;       /* quiet surfaces: plate background, notes */
  --ink: #15201E;        /* main text */
  --ink-soft: #4B5956;   /* secondary text */
  --rule: #D3DCD9;       /* hairlines and borders */
  --iris: #336B6A;       /* the one accent: links, plate lines, focus */
  --iris-wash: #DDE9E6;  /* accent tint */
  --warn-wash: #F1F0E8;  /* disclaimer box */
  --logo-bg: transparent;
  --font-serif: "Newsreader", "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  --font-sans: "Hanken Grotesk", "Segoe UI", system-ui, -apple-system, sans-serif;
  --step--1: 0.875rem;
  --step-0: 1.0625rem;
  --step-1: 1.3125rem;
  --step-2: 1.75rem;
  --step-3: 2.375rem;
  --step-4: clamp(2.5rem, 5.2vw, 3.75rem);
  --measure: 68ch;
  --gutter: clamp(1rem, 4vw, 2.5rem);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #101614; --wash: #17201E; --ink: #E4EBE9; --ink-soft: #A2B1AD;
    --rule: #2B3735; --iris: #8FC3BA; --iris-wash: #1C2D2A; --warn-wash: #1E1F1A; --logo-bg: #E8EEEC;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #101614; --wash: #17201E; --ink: #E4EBE9; --ink-soft: #A2B1AD;
  --rule: #2B3735; --iris: #8FC3BA; --iris-wash: #1C2D2A; --warn-wash: #1E1F1A; --logo-bg: #E8EEEC;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-serif);
  font-size: var(--step-0);
  line-height: 1.65;
  font-optical-sizing: auto;
}
img, svg { max-width: 100%; height: auto; }
a { color: var(--iris); text-underline-offset: 0.18em; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--iris); outline-offset: 3px; border-radius: 2px; }
h1, h2, h3 { font-weight: 500; line-height: 1.15; text-wrap: balance; margin: 0; letter-spacing: -0.01em; }
h1 { font-size: var(--step-4); font-weight: 400; letter-spacing: -0.02em; }
h2 { font-size: var(--step-2); }
h3 { font-size: var(--step-1); }
p { margin: 0; }

.wrap { width: 100%; max-width: 72rem; margin-inline: auto; padding-inline: var(--gutter); }
.skip { position: absolute; left: -999px; top: 0; }
.skip:focus { left: 1rem; top: 1rem; background: var(--paper); padding: .5rem 1rem; z-index: 10; }

/* Header */
.site-head { border-bottom: 1px solid var(--rule); background: var(--paper); }
.site-head .wrap { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: .75rem 2rem; padding-block: 1.1rem; }
.mark { display: grid; gap: .1rem; text-decoration: none; color: var(--ink); }
.mark-name { font-size: 1.35rem; letter-spacing: -0.01em; }
.mark-role { font-family: var(--font-sans); font-size: var(--step--1); color: var(--ink-soft); }
.nav { display: flex; flex-wrap: wrap; gap: .4rem 1.4rem; font-family: var(--font-sans); font-size: .95rem; }
.nav a { color: var(--ink); text-decoration: none; padding-block: .25rem; border-bottom: 1px solid transparent; }
.nav a:hover, .nav a[aria-current="page"] { border-bottom-color: var(--iris); }
.nav .lang { color: var(--ink-soft); }

/* Hero with the anatomical plate */
.hero .wrap { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: clamp(2rem, 5vw, 4.5rem); align-items: center; padding-block: clamp(2.5rem, 7vw, 5.5rem); }
.hero-text { display: grid; gap: 1.25rem; min-width: 0; }
.hero-role { font-family: var(--font-sans); font-size: 1rem; color: var(--ink-soft); }
.hero-lead { font-size: var(--step-1); line-height: 1.5; max-width: 34ch; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .75rem 1.5rem; font-family: var(--font-sans); font-size: .98rem; padding-top: .5rem; }
.btn { display: inline-block; background: var(--iris); color: var(--paper); text-decoration: none; padding: .7rem 1.2rem; border-radius: 3px; }
.btn:hover { filter: brightness(1.08); }

.plate { margin: 0; background: var(--wash); border: 1px solid var(--rule); padding: clamp(1rem, 3vw, 1.75rem); min-width: 0; }
.plate svg { display: block; width: 100%; }
.plate .ln { fill: none; stroke: var(--ink); stroke-width: 1.4; stroke-linecap: round; stroke-linejoin: round; }
.plate .ln-soft { fill: none; stroke: var(--ink-soft); stroke-width: 1; stroke-dasharray: 3 5; }
.plate .ln-iris { fill: none; stroke: var(--iris); stroke-width: 1.4; }
.plate .pupil { fill: var(--ink); }
.plate .lead { stroke: var(--iris); stroke-width: 1; fill: none; }
.plate .dot { fill: var(--iris); }
.plate .lbl { font-family: var(--font-sans); font-size: 17px; fill: var(--ink); }
.plate figcaption { font-size: var(--step--1); color: var(--ink-soft); padding-top: .9rem; line-height: 1.5; border-top: 1px solid var(--rule); margin-top: .9rem; }
.plate figcaption b { font-weight: 600; color: var(--ink); }

/* Sections */
.band { border-top: 1px solid var(--rule); }
.band > .wrap { padding-block: clamp(2.5rem, 6vw, 4.5rem); display: grid; gap: 2rem; }
.band-head { display: grid; gap: .6rem; max-width: var(--measure); }
.band-head p { color: var(--ink-soft); }

/* Procedure index: a definition list, not cards */
.index { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--rule); }
.index li { border-bottom: 1px solid var(--rule); }
.index a { display: grid; grid-template-columns: minmax(0, 18rem) minmax(0, 1fr); gap: .35rem 2rem; padding-block: 1.15rem; text-decoration: none; color: var(--ink); }
.index a:hover .ix-name { color: var(--iris); text-decoration: underline; text-underline-offset: .18em; }
.ix-name { font-size: var(--step-1); }
.ix-desc { color: var(--ink-soft); }

/* Exam checklist */
.checks { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr)); gap: 1.25rem 2.5rem; }
.checks li { display: grid; gap: .25rem; padding-top: .9rem; border-top: 2px solid var(--iris); }
.checks b { font-weight: 600; }
.checks span { color: var(--ink-soft); font-size: .98rem; }

/* Timeline (real chronology) */
.timeline { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; max-width: var(--measure); }
.timeline li { display: grid; grid-template-columns: 6.5rem minmax(0, 1fr); gap: 1.25rem; padding-block: .75rem; border-bottom: 1px solid var(--rule); }
.timeline time { font-family: var(--font-sans); font-variant-numeric: tabular-nums; color: var(--iris); font-size: .95rem; padding-top: .15rem; }

/* Article pages */
.crumbs { font-family: var(--font-sans); font-size: var(--step--1); color: var(--ink-soft); padding-top: 1.75rem; }
.crumbs ol { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: .35rem; }
.crumbs li + li::before { content: "/"; margin-right: .35rem; color: var(--rule); }
.crumbs a { color: var(--ink-soft); }
.article { display: grid; grid-template-columns: minmax(0, var(--measure)) minmax(0, 16rem); gap: clamp(2rem, 5vw, 4rem); padding-block: 1.5rem 4rem; align-items: start; }
.article-main { display: grid; gap: 1.5rem; min-width: 0; }
.article-main h1 { font-size: var(--step-3); }
.answer { font-size: var(--step-1); line-height: 1.55; }
.byline { font-family: var(--font-sans); font-size: var(--step--1); color: var(--ink-soft); display: flex; flex-wrap: wrap; gap: .25rem 1.5rem; padding-block: .8rem; border-block: 1px solid var(--rule); }
.byline b { color: var(--ink); font-weight: 600; }
.article-main h2 { padding-top: 1rem; }
.article-main ul, .article-main ol { margin: 0; padding-left: 1.25rem; display: grid; gap: .45rem; }
.article-main li::marker { color: var(--iris); }
.note { background: var(--iris-wash); padding: 1rem 1.25rem; border-left: 3px solid var(--iris); }
.aside { position: sticky; top: calc(env(safe-area-inset-top, 0px) + 1.5rem); display: grid; gap: 1.25rem; font-family: var(--font-sans); font-size: .95rem; min-width: 0; }
.aside h2 { font-family: var(--font-sans); font-size: .95rem; font-weight: 600; padding: 0; }
.toc { list-style: none; margin: 0; padding: 0; display: grid; gap: .4rem; border-left: 1px solid var(--rule); }
.toc a { display: block; padding-left: .9rem; color: var(--ink-soft); text-decoration: none; }
.toc a:hover { color: var(--iris); }
.related { display: grid; gap: .4rem; }

.faq { display: grid; gap: 0; border-top: 1px solid var(--rule); }
.faq details { border-bottom: 1px solid var(--rule); padding-block: .9rem; }
.faq summary { cursor: pointer; font-size: var(--step-1); list-style: none; display: flex; justify-content: space-between; gap: 1rem; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-family: var(--font-sans); color: var(--iris); }
.faq details[open] summary::after { content: "–"; }
.faq details p { padding-top: .6rem; color: var(--ink-soft); }

.refs { font-family: var(--font-sans); font-size: var(--step--1); color: var(--ink-soft); }
.refs ol { padding-left: 1.25rem; }

.disclaimer { background: var(--warn-wash); border: 1px solid var(--rule); padding: 1rem 1.25rem; font-family: var(--font-sans); font-size: var(--step--1); color: var(--ink-soft); }

/* Contact */
.contact { display: grid; grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); gap: 1.5rem 2.5rem; }
.contact dt { font-family: var(--font-sans); font-size: var(--step--1); color: var(--ink-soft); }
.contact dd { margin: .2rem 0 0; font-variant-numeric: tabular-nums; }

/* Footer */
.site-foot { border-top: 1px solid var(--rule); font-family: var(--font-sans); font-size: var(--step--1); color: var(--ink-soft); }
.site-foot .wrap { display: grid; grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr)); gap: 1.5rem 2rem; padding-block: 2.5rem; }
.site-foot a { color: var(--ink-soft); }
.site-foot p + p { margin-top: .4rem; }

.draft-flag { background: var(--iris); color: var(--paper); font-family: var(--font-sans); font-size: var(--step--1); text-align: center; padding: .45rem 1rem; }

@media (max-width: 52rem) {
  .hero .wrap { grid-template-columns: minmax(0, 1fr); }
  .article { grid-template-columns: minmax(0, 1fr); }
  .aside { position: static; order: -1; }
  .aside .toc-box { display: none; }
  .index a { grid-template-columns: minmax(0, 1fr); }
  .timeline li { grid-template-columns: 5rem minmax(0, 1fr); gap: .75rem; }
}
@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; transition: none !important; } }

/* Portrait and logo */
.mark { grid-auto-flow: column; align-items: center; gap: .8rem; }
.mark-text { display: grid; gap: .1rem; }
.mark-logo { width: 52px; height: auto; background: var(--logo-bg); border-radius: 6px; padding: 2px; }
.portrait img { object-position: 50% 20%; }
.about-grid { grid-template-columns: minmax(0, 18rem) minmax(0, 1fr); align-items: start; column-gap: clamp(2rem, 5vw, 4rem); }
.about-body { display: grid; gap: 2rem; min-width: 0; }
.portrait { margin: 0; aspect-ratio: 4 / 5; max-width: 100%; background: var(--wash); border: 1px solid var(--rule); overflow: hidden; }
.portrait img { width: 100%; height: 100%; object-fit: cover; display: block; }
.portrait-empty { display: grid; place-items: center; text-align: center; padding: 1.5rem; font-family: var(--font-sans); font-size: var(--step--1); color: var(--ink-soft); border-style: dashed; }
.aside .portrait { max-width: 16rem; }
@media (max-width: 52rem) {
  .about-grid { grid-template-columns: minmax(0, 1fr); }
  .about-grid .portrait { max-width: 18rem; }
  .aside .portrait { display: none; }
}

/* Photos and video */
.photo { margin: 0; max-width: 26rem; }
.photo img { display: block; width: 100%; height: auto; border: 1px solid var(--rule); }
.photo figcaption, .video figcaption { font-family: var(--font-sans); font-size: var(--step--1); color: var(--ink-soft); padding-top: .6rem; }
.visit-grid { grid-template-columns: minmax(0, 20rem) minmax(0, 1fr); align-items: start; column-gap: clamp(2rem, 5vw, 4rem); }
.video { margin: 0; max-width: 100%; }
.video video { display: block; width: 100%; height: auto; aspect-ratio: 9 / 16; background: var(--wash); border: 1px solid var(--rule); }
.steps { list-style: none; counter-reset: step; margin: 0; padding: 0; display: grid; gap: 0; max-width: var(--measure); }
.steps li { counter-increment: step; display: grid; grid-template-columns: 2.25rem minmax(0, 1fr); column-gap: 1rem; row-gap: .2rem; padding-block: .85rem; border-bottom: 1px solid var(--rule); }
.steps li::before { content: counter(step); grid-row: span 2; font-family: var(--font-sans); font-variant-numeric: tabular-nums; color: var(--iris); font-weight: 600; }
.steps span { color: var(--ink-soft); }
@media (max-width: 52rem) { .visit-grid { grid-template-columns: minmax(0, 1fr); } .video { max-width: 20rem; } }