/* Olympex · GHK-Cu Topical landing page
   Black / silver / white, one steel-blue accent taken from the bottle label. */

:root {
  --bg: #09090a;
  --panel: #101012;
  --panel-2: #15151a;
  --line: rgba(255, 255, 255, .09);
  --line-2: rgba(255, 255, 255, .18);
  --text: #f5f5f3;
  --muted: #a9a9af;
  --dim: #85858c;
  --accent: #8aabc8;
  --accent-deep: #4f7290;
  --display: "Inter Tight", Inter, system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  --body: Inter, system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  --gutter: 20px;
  --ease: cubic-bezier(.2, .7, .2, 1);
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 400 16px/1.6 var(--body);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
img { height: auto; }
a { color: inherit; }
h1, h2, h3, p, ul, ol, dl, dd, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }

.wrap { width: 100%; max-width: 1160px; margin: 0 auto; padding: 0 var(--gutter); }

/* ---------- type ---------- */
h1, h2, h3 { font-family: var(--display); letter-spacing: -.025em; line-height: 1.04; }
h1 { font-size: clamp(42px, 11.5vw, 84px); font-weight: 800; letter-spacing: -.035em; }
h2 { font-size: clamp(30px, 7vw, 52px); font-weight: 700; }
h3 { font-size: 19px; font-weight: 700; letter-spacing: -.01em; line-height: 1.25; }

.eyebrow {
  display: flex; align-items: center; gap: 12px;
  font-size: 11.5px; font-weight: 600; letter-spacing: .2em; text-transform: uppercase;
  color: var(--accent);
}
/* the label's rule-and-plus motif */
.eyebrow::after {
  content: "+"; flex: 0 0 auto;
  font: 400 15px/1 var(--body); letter-spacing: 0; color: var(--accent);
  padding-left: 44px;
  background: linear-gradient(var(--accent-deep), var(--accent-deep)) left center / 36px 1px no-repeat;
}

.body { color: var(--muted); font-size: 16.5px; max-width: 46ch; }
.body + .body { margin-top: 14px; }
.fine { color: var(--dim); font-size: 13px; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 12px;
  min-height: 54px; padding: 0 26px;
  border-radius: 999px; border: 1px solid transparent;
  font: 600 16px/1 var(--body); letter-spacing: -.005em; text-decoration: none; white-space: nowrap;
  transition: transform .2s var(--ease), background-color .2s, border-color .2s, box-shadow .2s;
}
.btn:active { transform: scale(.98); }
.btn-primary {
  background: linear-gradient(180deg, #fff 0%, #dcdde0 100%);
  color: #0a0a0b;
  box-shadow: 0 1px 0 rgba(255, 255, 255, .6) inset, 0 12px 34px -12px rgba(190, 205, 220, .45);
}
.btn-primary:hover { background: #fff; box-shadow: 0 1px 0 rgba(255, 255, 255, .6) inset, 0 16px 40px -12px rgba(190, 205, 220, .65); }
.btn-ghost { min-height: 40px; padding: 0 18px; font-size: 14px; border-color: var(--line-2); color: var(--text); }
.btn-ghost:hover { border-color: rgba(255, 255, 255, .5); background: rgba(255, 255, 255, .05); }
.btn-sep { width: 1px; height: 16px; background: rgba(10, 10, 11, .28); }

/* ---------- strip + header ---------- */
.strip {
  display: flex; justify-content: center; gap: 12px;
  padding: 9px var(--gutter);
  background: #000; border-bottom: 1px solid var(--line);
  font-size: 11px; font-weight: 500; letter-spacing: .16em; text-transform: uppercase; color: var(--muted);
  text-align: center; white-space: nowrap;
}
.strip span[aria-hidden], .strip-more { display: none; }
.strip span[aria-hidden] { color: var(--accent); }

.top {
  position: relative; z-index: 30;
  background: rgba(9, 9, 10, .74);
  -webkit-backdrop-filter: saturate(140%) blur(16px); backdrop-filter: saturate(140%) blur(16px);
  border-bottom: 1px solid var(--line);
}
.top-in { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.logo img { width: 128px; height: 28px; }
.top-buy span { color: var(--muted); font-weight: 500; }

/* ---------- hero ---------- */
.hero {
  position: relative;
  padding: 26px 0 44px;
  background:
    radial-gradient(90% 46% at 50% 34%, rgba(126, 150, 176, .13), transparent 70%),
    var(--bg);
}
.hero-grid { display: grid; gap: 0; }
.hero-head .eyebrow { margin-bottom: 12px; }

/* The photo is 4:5 with empty studio above and below the product, so phones
   show a squarer crop of it. Keep the ratio no wider than this or the bottle is cut. */
.shot {
  margin: 6px calc(var(--gutter) * -1) 0;
  aspect-ratio: 1 / .94;
  overflow: hidden;
  -webkit-mask-image: linear-gradient(to right, transparent, #000 12%, #000 88%, transparent), linear-gradient(to bottom, transparent, #000 3%, #000 88%, transparent);
  -webkit-mask-composite: source-in;
  mask-image: linear-gradient(to right, transparent, #000 12%, #000 88%, transparent), linear-gradient(to bottom, transparent, #000 3%, #000 88%, transparent);
  mask-composite: intersect;
}
.shot img { width: 100%; height: 100%; object-fit: cover; object-position: 50% 60%; }

.lead { color: var(--muted); font-size: 16.5px; line-height: 1.55; max-width: 44ch; }

.price-row { display: flex; align-items: center; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.price { font: 700 34px/1 var(--display); letter-spacing: -.03em; margin-right: 4px; }
.pill {
  display: inline-flex; align-items: center; gap: 7px;
  height: 28px; padding: 0 12px;
  border: 1px solid var(--line-2); border-radius: 999px;
  font-size: 12.5px; font-weight: 500; color: var(--muted);
}
.dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 3px rgba(138, 171, 200, .18); }

.buy { display: flex; gap: 10px; margin-top: 20px; }
.buy .btn { flex: 1 1 auto; min-width: 0; }
.hero-buy > .fine { margin-top: 12px; text-align: center; }

.assure { margin-top: 24px; border-top: 1px solid var(--line); }
.assure li {
  display: flex; align-items: center; gap: 12px;
  padding: 13px 0; border-bottom: 1px solid var(--line);
  font-size: 14.5px; color: #d7d7d9;
}
.assure svg, .card svg {
  flex: 0 0 auto; width: 20px; height: 20px;
  fill: none; stroke: var(--accent); stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round;
}
.ruo { margin-top: 16px; font-size: 12px; letter-spacing: .04em; color: var(--dim); }

/* ---------- facts ---------- */
.facts { border-block: 1px solid var(--line); background: #060607; }
.facts-grid { display: grid; grid-template-columns: 1fr 1fr; padding: 0; }
.facts-grid > div { padding: 22px var(--gutter); border-bottom: 1px solid var(--line); }
.facts-grid > div:nth-child(odd) { border-right: 1px solid var(--line); }
.facts-grid > div:nth-last-child(-n+2) { border-bottom: 0; }
.facts b {
  display: block; font: 700 24px/1.1 var(--display); letter-spacing: -.02em;
  background: linear-gradient(180deg, #fff 20%, #a9adb4 100%); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.facts span { display: block; margin-top: 6px; font-size: 13px; color: var(--muted); }

/* ---------- sections ---------- */
.sec { padding: 72px 0; }
.sec-alt { background: var(--panel); border-block: 1px solid var(--line); }
.sec-head { margin-bottom: 34px; }
.sec .eyebrow { margin-bottom: 16px; }
.sec h2 + .body { margin-top: 20px; }

.split { display: grid; gap: 40px; }

.chain { display: flex; align-items: center; margin-top: 30px; }
.chain .res, .chain .cu {
  display: grid; place-items: center; height: 46px; border-radius: 999px;
  font: 600 14px/1 var(--body); letter-spacing: .02em;
}
.chain .res { width: 62px; border: 1px solid var(--line-2); color: var(--text); }
.chain i { width: 18px; height: 1px; background: var(--line-2); }
.chain .cu {
  margin-left: 14px; padding: 0 16px;
  background: rgba(138, 171, 200, .12); border: 1px solid rgba(138, 171, 200, .45); color: var(--accent);
}
.chain sup { font-size: .68em; margin-left: 1px; }

.spec { border-top: 1px solid var(--line-2); }
.spec > div { display: flex; justify-content: space-between; gap: 20px; padding: 15px 0; border-bottom: 1px solid var(--line); }
.spec dt { flex: 0 0 auto; color: var(--dim); font-size: 13.5px; }
.spec dd { text-align: right; font-size: 14.5px; font-weight: 500; }
.spec sup { font-size: .68em; }

.cards { display: grid; gap: 12px; }
.card {
  padding: 26px 24px 28px; border: 1px solid var(--line); border-radius: 18px;
  background: linear-gradient(180deg, var(--panel-2), rgba(21, 21, 26, .35));
}
.card svg { width: 26px; height: 26px; margin-bottom: 22px; }
.card p { margin-top: 10px; color: var(--muted); font-size: 15px; }

.steps { display: grid; gap: 0; counter-reset: none; }
.steps li { padding: 24px 0; border-top: 1px solid var(--line); }
.steps li:last-child { border-bottom: 1px solid var(--line); }
.steps span { display: block; margin-bottom: 14px; font: 600 12px/1 var(--body); letter-spacing: .18em; color: var(--accent); }
.steps p { margin-top: 8px; color: var(--muted); font-size: 15px; max-width: 40ch; }

.faq { border-top: 1px solid var(--line-2); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary {
  display: flex; align-items: center; justify-content: space-between; gap: 18px;
  padding: 20px 0; cursor: pointer; list-style: none;
  font: 600 17px/1.3 var(--display); letter-spacing: -.01em;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: ""; flex: 0 0 auto; width: 12px; height: 12px;
  background:
    linear-gradient(var(--muted), var(--muted)) center / 12px 1.5px no-repeat,
    linear-gradient(var(--muted), var(--muted)) center / 1.5px 12px no-repeat;
  transition: transform .25s var(--ease);
}
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p { padding: 0 30px 22px 0; color: var(--muted); font-size: 15px; }
.faq a { color: var(--text); text-underline-offset: 3px; text-decoration-color: var(--line-2); }
.faq a:hover { text-decoration-color: var(--text); }

/* ---------- closing band ---------- */
.close {
  padding: 56px 0 64px;
  background: radial-gradient(80% 70% at 50% 0%, rgba(126, 150, 176, .14), transparent 70%), var(--bg);
}
.close-in { display: grid; gap: 4px; text-align: center; justify-items: center; }
.close-in img {
  width: 210px;
  -webkit-mask-image: radial-gradient(closest-side, #000 66%, transparent);
  mask-image: radial-gradient(closest-side, #000 66%, transparent);
}
.close .eyebrow { justify-content: center; margin-bottom: 14px; }
.close .eyebrow::after { display: none; }
.close h2 { font-size: clamp(28px, 6.4vw, 46px); max-width: 16ch; margin-inline: auto; }
.close-cta { display: grid; gap: 12px; justify-items: center; margin-top: 26px; }
.close-cta .btn { min-width: 240px; }

/* ---------- footer ---------- */
.foot { padding: 40px 0 34px; border-top: 1px solid var(--line); background: #060607; }
.foot-top { display: grid; gap: 22px; }
.foot-top img { width: 128px; height: 28px; }
.foot nav { display: flex; flex-wrap: wrap; gap: 10px 22px; }
.foot nav a, .foot-contact a { color: var(--muted); font-size: 14px; text-decoration: none; }
.foot nav a:hover, .foot-contact a:hover { color: var(--text); }
.foot-contact { display: flex; flex-wrap: wrap; gap: 8px 22px; }
.notice { margin-top: 28px; padding-top: 24px; border-top: 1px solid var(--line); color: var(--dim); font-size: 12px; line-height: 1.7; }
.copy { margin-top: 16px; color: var(--dim); font-size: 12px; }

/* ---------- phone buy bar ---------- */
.buybar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 40;
  display: flex; align-items: center; justify-content: space-between; gap: 14px;
  padding: 10px var(--gutter) calc(10px + env(safe-area-inset-bottom));
  background: rgba(12, 12, 14, .9);
  -webkit-backdrop-filter: saturate(140%) blur(18px); backdrop-filter: saturate(140%) blur(18px);
  border-top: 1px solid var(--line-2);
  transform: translateY(105%); visibility: hidden;
  transition: transform .32s var(--ease), visibility 0s .32s;
}
.buybar.is-on { transform: none; visibility: visible; transition: transform .32s var(--ease); }
.buybar b { display: block; font: 700 15px/1.2 var(--display); }
.buybar div span { font-size: 13px; color: var(--muted); }
.buybar .btn { min-height: 46px; padding: 0 24px; font-size: 15px; }
.foot { padding-bottom: calc(34px + 72px + env(safe-area-inset-bottom)); }

/* ---------- reveal ---------- */
.js .reveal { opacity: 0; transform: translateY(10px); transition: opacity .5s var(--ease), transform .5s var(--ease); }
.js .reveal.in { opacity: 1; transform: none; }
.js .cards .reveal:nth-child(2), .js .steps .reveal:nth-child(2) { transition-delay: .06s; }
.js .cards .reveal:nth-child(3), .js .steps .reveal:nth-child(3) { transition-delay: .12s; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .reveal { opacity: 1; transform: none; transition: none; }
  .btn, .buybar { transition: none; }
}

/* ---------- small phones ---------- */
@media (max-width: 359px) {
  .top-buy span { display: none; }
}

/* ---------- tablet ---------- */
@media (min-width: 640px) {
  :root { --gutter: 32px; }
  .strip span[aria-hidden], .strip-more { display: inline; }
  .facts-grid { grid-template-columns: repeat(4, 1fr); padding: 0 var(--gutter); }
  .facts-grid > div { border-bottom: 0; border-right: 1px solid var(--line); padding: 28px 24px; }
  .facts-grid > div:first-child { padding-left: 0; }
  .facts-grid > div:last-child { border-right: 0; }
  .cards { grid-template-columns: repeat(3, 1fr); gap: 16px; }
  .steps { grid-template-columns: repeat(3, 1fr); gap: 28px; }
  .steps li, .steps li:last-child { border-bottom: 0; padding: 26px 0 0; }
  .hero-buy > .fine { text-align: left; }
  .shot { width: 540px; max-width: 100%; margin: 10px auto 0; }
}

/* ---------- desktop ---------- */
@media (min-width: 900px) {
  .top { position: sticky; top: 0; }
  .hero { padding: 36px 0 72px; background: radial-gradient(46% 62% at 27% 50%, rgba(126, 150, 176, .15), transparent 70%), var(--bg); }
  .hero-grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    grid-template-areas: "shot head" "shot buy";
    grid-template-rows: auto 1fr;
    column-gap: 56px; align-items: start;
  }
  .hero-head { grid-area: head; padding-top: clamp(40px, 9vh, 110px); }
  .hero-head .eyebrow { margin-bottom: 18px; }
  .hero-buy { grid-area: buy; padding-top: 22px; max-width: 480px; }
  .shot {
    grid-area: shot; margin: 0;
    aspect-ratio: 4 / 5; max-height: min(82vh, 760px); justify-self: center; width: 100%;
    -webkit-mask-image: linear-gradient(to right, transparent, #000 14%, #000 86%, transparent), linear-gradient(to bottom, transparent, #000 9%, #000 86%, transparent);
    mask-image: linear-gradient(to right, transparent, #000 14%, #000 86%, transparent), linear-gradient(to bottom, transparent, #000 9%, #000 86%, transparent);
  }
  .shot img { object-position: 50% 50%; }
  h1 { font-size: clamp(56px, 6.2vw, 84px); }
  .lead { font-size: 18px; }
  .price { font-size: 40px; }
  .price-row { margin-top: 26px; }
  .buy { margin-top: 24px; }

  .sec { padding: 112px 0; }
  .sec-head { margin-bottom: 48px; }
  .split { grid-template-columns: 1fr 1fr; gap: 88px; align-items: center; }
  .body { font-size: 17.5px; }
  .card { padding: 32px 30px 34px; }
  .faq-wrap { display: grid; grid-template-columns: .8fr 1.2fr; gap: 88px; align-items: start; }
  .faq-wrap .sec-head { margin: 0; position: sticky; top: 100px; }

  .close { padding: 96px 0 104px; }
  .close-in { grid-template-columns: auto 1fr; gap: 56px; text-align: left; justify-items: start; align-items: center; max-width: 900px; }
  .close-in img { width: 300px; }
  .close .eyebrow { justify-content: flex-start; }
  .close h2 { margin-inline: 0; }
  .close-cta { display: flex; align-items: center; gap: 18px; margin-top: 30px; }

  .foot-top { grid-template-columns: auto 1fr auto; align-items: center; gap: 40px; }
  .foot nav { justify-content: center; }
  .foot { padding-bottom: 34px; }
  .buybar { display: none; }
}