/* ============================================================
   British Ophthalmology Centre — precision-optics aesthetic
   ============================================================ */
:root {
  --ink:        #11242f;
  --ink-soft:   #3a5560;
  --navy:       #0a1c25;
  --navy-2:     #0e2a36;
  --teal:       #1c7d83;
  --teal-deep:  #16566a;
  --brass:      #b08642;
  --brass-lt:   #cda35a;
  --paper:      #f6f2e9;
  --paper-2:    #efe8d9;
  --cream:      #e7ddc7;
  --line:       rgba(17, 36, 47, 0.14);
  --line-lt:    rgba(231, 221, 199, 0.18);

  --serif: 'Fraunces', Georgia, 'Times New Roman', serif;
  --sans:  'Hanken Grotesk', system-ui, Arial, sans-serif;

  --maxw: 1240px;
  --pad: clamp(20px, 5vw, 88px);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3 { margin: 0; font-family: var(--serif); font-weight: 500; line-height: 1.04; }
::selection { background: var(--brass); color: var(--navy); }

/* film grain overlay */
.grain {
  position: fixed; inset: 0; z-index: 9999; pointer-events: none; opacity: 0.04;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ───────── Buttons ───────── */
.btn {
  --bg: var(--ink); --fg: var(--paper);
  display: inline-flex; align-items: center; justify-content: center; gap: .5em;
  font-family: var(--sans); font-weight: 600; font-size: 15px; letter-spacing: .02em;
  padding: 15px 30px; border-radius: 2px; border: 1px solid transparent;
  cursor: pointer; transition: transform .35s cubic-bezier(.2,.7,.2,1), background .3s, color .3s, box-shadow .3s;
  background: var(--bg); color: var(--fg);
}
.btn--solid { background: var(--brass); color: var(--navy); border-color: var(--brass); }
.btn--solid:hover { background: var(--brass-lt); transform: translateY(-2px); box-shadow: 0 14px 34px -14px rgba(176,134,66,.7); }
.btn--ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn--ghost:hover { border-color: var(--ink); }
.btn--text { background: transparent; color: var(--cream); padding: 15px 4px; }
.btn--text:hover { color: var(--brass-lt); }
.btn--full { width: 100%; }

/* ───────── Navigation ───────── */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; gap: 28px;
  padding: 16px var(--pad);
  transition: background .4s, box-shadow .4s, padding .4s;
}
.nav.is-stuck {
  background: rgba(246,242,233,.86);
  backdrop-filter: blur(14px) saturate(1.2);
  box-shadow: 0 1px 0 var(--line);
  padding-top: 12px; padding-bottom: 12px;
}
.nav__brand { position: relative; display: inline-flex; transition: transform .4s; }
.nav__brand:hover { transform: scale(1.03); }
.nav__logo--dark { position: absolute; left: 0; top: 0; opacity: 0; transition: opacity .35s; }
.nav.is-stuck .nav__logo--light { opacity: 0; }
.nav.is-stuck .nav__logo--dark { opacity: 1; }
.nav__links { margin-left: auto; display: flex; gap: 30px; font-size: 15px; font-weight: 500; }
.nav__links a { position: relative; padding: 4px 0; color: var(--cream); transition: color .3s; }
.nav.is-stuck .nav__links a { color: var(--ink-soft); }
.nav__links a::after {
  content: ""; position: absolute; left: 0; bottom: -2px; width: 0; height: 1.5px;
  background: var(--brass); transition: width .35s cubic-bezier(.2,.7,.2,1);
}
.nav__links a:hover { color: var(--brass); }
.nav__links a:hover::after { width: 100%; }
.nav.is-stuck .nav__links a:hover { color: var(--ink); }
.nav__cta { color: var(--cream); border-color: var(--line-lt); }
.nav.is-stuck .nav__cta { color: var(--ink); border-color: var(--line); }
.nav__burger { display: none; }

/* ───────── Hero ───────── */
.hero {
  position: relative; display: flex; flex-direction: column;
  justify-content: center; padding: 132px var(--pad) 84px;
  background:
    radial-gradient(120% 90% at 85% 20%, #123642 0%, var(--navy-2) 42%, var(--navy) 100%);
  color: var(--cream); overflow: hidden;
}
.hero__bg { position: absolute; inset: 0; pointer-events: none; }
.aperture {
  position: absolute; right: -6%; top: 50%; transform: translateY(-50%);
  width: min(520px, 56vw); height: auto; opacity: .65;
}
.aperture__rings { transform-origin: 300px 300px; animation: spin 60s linear infinite; }
.aperture__cross { transform-origin: 300px 300px; animation: spin 90s linear infinite reverse; }
.aperture__iris { transform-origin: 0 0; animation: breathe 7s ease-in-out infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes breathe {
  0%,100% { transform: translate(300px,300px) scale(1); }
  50%     { transform: translate(300px,300px) scale(.94); }
}

.hero__inner { position: relative; max-width: var(--maxw); width: 100%; margin: 0 auto; }
.eyebrow {
  font-size: 12px; font-weight: 600; letter-spacing: .3em; text-transform: uppercase;
  color: var(--brass-lt); margin: 0 0 20px;
  display: inline-flex; align-items: center; gap: 12px;
}
.eyebrow::before { content: ""; width: 32px; height: 1px; background: var(--brass); }
.hero__title {
  font-size: clamp(38px, 6vw, 72px); font-weight: 400; letter-spacing: -.02em;
  margin: 0 0 22px; max-width: 16ch;
}
.hero__title .accent { color: var(--brass-lt); font-style: italic; font-weight: 500; }
.hero__lead { max-width: 54ch; font-size: clamp(16px, 1.6vw, 18px); color: #c4d4d8; margin: 0 0 32px; }
.hero__actions { display: flex; align-items: center; gap: 22px; flex-wrap: wrap; }

/* ───────── Sections shared ───────── */
.section { max-width: var(--maxw); margin: 0 auto; padding: clamp(72px,11vw,150px) var(--pad); }
.section__head { display: flex; align-items: baseline; gap: 18px; margin-bottom: 56px; }
.section__no { font-family: var(--serif); font-size: 15px; color: var(--brass); font-feature-settings: "tnum"; }
.section__kicker { font-size: 13px; font-weight: 600; letter-spacing: .28em; text-transform: uppercase; color: var(--ink-soft); }
.section__head::after { content: ""; flex: 1; height: 1px; background: var(--line); align-self: center; }

/* ───────── About ───────── */
.about__grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: clamp(36px, 6vw, 88px); align-items: start; }
.about__statement { font-size: clamp(28px, 4vw, 46px); line-height: 1.12; letter-spacing: -.01em; }
.about__statement em { font-style: italic; color: var(--teal); }
.about__body p { margin: 0 0 18px; color: #2c4853; }
.about__pills { list-style: none; padding: 0; margin: 30px 0 0; display: flex; flex-wrap: wrap; gap: 10px; }
.about__pills li {
  font-size: 13px; font-weight: 600; letter-spacing: .02em; color: var(--teal-deep);
  border: 1px solid var(--line); border-radius: 999px; padding: 8px 16px;
}

/* ───────── Leadership ───────── */
.leadership { background: var(--paper-2); max-width: none; }
.leadership > .section__head, .leadership__grid { max-width: var(--maxw); margin-left: auto; margin-right: auto; }
.leadership__grid { display: grid; grid-template-columns: minmax(200px, 260px) 1fr; gap: clamp(36px, 6vw, 80px); align-items: center; }
.leadership__photo { margin: 0; position: relative; }
.leadership__photo::before {
  content: ""; position: absolute; inset: -14px -14px 18px 18px; border: 1px solid var(--brass); z-index: 0;
}
.leadership__photo img { position: relative; z-index: 1; border-radius: 4px; width: 100%; aspect-ratio: 1 / 1; object-fit: cover; object-position: center top; box-shadow: 0 30px 70px -40px rgba(10,28,37,.7); }
.leadership__name { font-size: clamp(34px, 5vw, 58px); }
.leadership__role { font-size: clamp(16px, 1.8vw, 19px); font-weight: 600; letter-spacing: .03em; color: var(--brass); margin: 12px 0 0; }

/* ───────── Partners ───────── */
.partners__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 26px; }
.partner {
  position: relative; background: #fff; border: 1px solid var(--line); border-radius: 4px;
  padding: 44px 40px; overflow: hidden; transition: transform .4s cubic-bezier(.2,.7,.2,1), box-shadow .4s, border-color .4s;
}
.partner::after {
  content: ""; position: absolute; left: 0; top: 0; width: 3px; height: 100%;
  background: linear-gradient(var(--teal), var(--brass)); transform: scaleY(0); transform-origin: top; transition: transform .45s cubic-bezier(.2,.7,.2,1);
}
.partner:hover { transform: translateY(-6px); box-shadow: 0 30px 60px -34px rgba(17,36,47,.4); border-color: transparent; }
.partner:hover::after { transform: scaleY(1); }
.partner__logo { display: flex; align-items: center; height: 46px; margin-bottom: 22px; }
.partner__logo img { height: 100%; width: auto; max-width: 210px; object-fit: contain; object-position: left center; }
.partner__name { display: none; }
.partner__desc { margin: 16px 0 22px; color: #2c4853; font-size: 16px; }
.partner__link { font-size: 14px; font-weight: 600; letter-spacing: .02em; color: var(--teal-deep); transition: color .3s, transform .3s; display: inline-block; }
.partner:hover .partner__link { color: var(--brass); transform: translateX(4px); }

/* ───────── Contacts ───────── */
.contacts { background: var(--navy); color: var(--cream); max-width: none; }
.contacts > .section__head, .contacts__grid { max-width: var(--maxw); margin-left: auto; margin-right: auto; }
.section__head--light .section__kicker { color: #8aa3ab; }
.section__head--light::after { background: var(--line-lt); }
.contacts__grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(40px, 7vw, 96px); align-items: start; }
.contacts__title { font-size: clamp(30px, 4vw, 48px); margin-bottom: 36px; }
.contacts__list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 24px; }
.contacts__list li { display: flex; gap: 16px; align-items: flex-start; }
.contacts__ic { font-size: 20px; line-height: 1.4; filter: saturate(.4); }
.contacts__list b { color: var(--brass-lt); font-weight: 600; font-size: 13px; letter-spacing: .14em; text-transform: uppercase; }
.contacts__list a:hover { color: var(--brass-lt); }

.contacts__form { background: rgba(231,221,199,.04); border: 1px solid var(--line-lt); border-radius: 6px; padding: clamp(26px, 4vw, 40px); }
.form__intro { margin: 0 0 24px; font-family: var(--serif); font-style: italic; font-size: 19px; color: var(--cream); }
.field { margin-bottom: 18px; }
.field label { display: block; font-size: 13px; font-weight: 600; letter-spacing: .1em; text-transform: uppercase; color: #9fb6bc; margin-bottom: 8px; }
.field input, .field textarea {
  width: 100%; font-family: var(--sans); font-size: 16px; color: var(--cream);
  background: rgba(10,28,37,.5); border: 1px solid var(--line-lt); border-radius: 3px;
  padding: 13px 14px; transition: border-color .3s, box-shadow .3s; resize: vertical;
}
.field input::placeholder, .field textarea::placeholder { color: #5e7780; }
.field input:focus, .field textarea:focus { outline: none; border-color: var(--brass); box-shadow: 0 0 0 3px rgba(176,134,66,.18); }
.field input[aria-invalid="true"] { border-color: #d98a6a; }
.field__err { margin: 6px 0 0; font-size: 13px; color: #e0a487; }
.form__ok { margin: 18px 0 0; font-size: 15px; color: var(--brass-lt); text-align: center; }

/* ───────── Footer ───────── */
.footer { background: var(--navy); color: #7a929a; padding: 40px var(--pad); border-top: 1px solid var(--line-lt); display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
.footer__logo { opacity: .9; }
.footer p { margin: 0; font-size: 14px; }

/* ───────── Reveal animation ───────── */
.reveal { opacity: 0; transform: translateY(26px); animation: reveal .9s cubic-bezier(.2,.7,.2,1) forwards; animation-delay: calc(var(--d, 0) * 120ms + 150ms); }
@keyframes reveal { to { opacity: 1; transform: none; } }
.in-view > * { opacity: 0; transform: translateY(28px); }
.in-view.is-visible > * { opacity: 1; transform: none; transition: opacity .8s cubic-bezier(.2,.7,.2,1), transform .8s cubic-bezier(.2,.7,.2,1); }
.in-view.is-visible > *:nth-child(2) { transition-delay: .08s; }
.in-view.is-visible > *:nth-child(3) { transition-delay: .16s; }

/* ───────── Responsive ───────── */
@media (max-width: 920px) {
  .nav__links, .nav__cta { display: none; }
  .nav__burger { display: inline-flex; flex-direction: column; gap: 5px; margin-left: auto; background: none; border: 0; padding: 8px; cursor: pointer; }
  .nav__burger span { width: 26px; height: 2px; background: var(--cream); transition: .3s; }
  .nav.is-stuck .nav__burger span { background: var(--ink); }
  .nav.is-open .nav__burger span:first-child { transform: translateY(7px) rotate(45deg); }
  .nav.is-open .nav__burger span:last-child { transform: translateY(-7px) rotate(-45deg); }
  .nav.is-open .nav__links {
    display: flex; position: fixed; inset: 64px 0 auto; flex-direction: column; gap: 0;
    background: rgba(10,28,37,.97); padding: 10px var(--pad) 26px;
  }
  .nav.is-open .nav__links a { color: var(--cream); padding: 16px 0; border-bottom: 1px solid var(--line-lt); }
  .about__grid, .leadership__grid, .partners__grid, .contacts__grid { grid-template-columns: 1fr; }
  .leadership__photo { max-width: 360px; }
  .aperture { right: -28%; opacity: .55; }
}
@media (max-width: 520px) {
  body { font-size: 16px; }
  .hero { padding-top: 120px; }
  .hero__actions { flex-direction: column; align-items: stretch; }
  .hero__actions .btn { width: 100%; }
  .hero__scroll { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal, .in-view > * { opacity: 1; transform: none; }
}