@layer reset, base, components, layout, responsive;

@layer reset {
  *, *::before, *::after { box-sizing: border-box; }
  html { scroll-behavior: smooth; }
  body, h1, h2, h3, p, figure, dl, dd, ol, ul { margin: 0; }
  ul, ol { padding: 0; }
  img { display: block; max-width: 100%; }
  button, input, textarea, select { font: inherit; }
  summary { list-style: none; }
  summary::-webkit-details-marker { display: none; }
}

@layer base {
  :root {
    --ivory: #faf8f5;
    --stone: #eeeae5;
    --stone-deep: #e1dbd3;
    --white: #fff;
    --ink: #151515;
    --graphite: #4b4b4b;
    --muted: #5e5a55;
    --aqua: #18afe5;
    --aqua-dark: #087ca7;
    --ice: #ddf4fa;
    --watermelon: #e95f63;
    --line: rgba(21, 21, 21, .14);
    --line-light: rgba(255, 255, 255, .22);
    --serif: "Iowan Old Style", "Baskerville", "Times New Roman", serif;
    --sans: Inter, "Helvetica Neue", Helvetica, Arial, sans-serif;
    --shell: 1200px;
    --reading: 700px;
    --shadow-soft: 0 24px 70px rgba(34, 30, 27, .08);
    --shadow-product: 0 28px 45px rgba(20, 48, 58, .19);
  }

  html { color-scheme: light; scroll-padding-top: 80px; }
  body {
    min-width: 320px;
    overflow-x: hidden;
    color: var(--ink);
    background: var(--ivory);
    font-family: var(--sans);
    font-size: 18px;
    line-height: 1.66;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
  }
  body::before {
    position: fixed;
    inset: 0;
    z-index: -1;
    pointer-events: none;
    content: "";
    opacity: .17;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.75' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.16'/%3E%3C/svg%3E");
  }
  h1, h2, h3 { text-wrap: balance; }
  h1, h2 {
    font-family: var(--serif);
    font-weight: 400;
    letter-spacing: -.045em;
  }
  h1 { font-size: clamp(3.35rem, 6.6vw, 6.4rem); line-height: .94; }
  h2 { font-size: clamp(2.55rem, 4.6vw, 4.85rem); line-height: .98; }
  h3 { font-size: 1.35rem; line-height: 1.18; }
  p { text-wrap: pretty; }
  a { color: inherit; }
  button { color: inherit; }
  :focus-visible { outline: 3px solid var(--aqua); outline-offset: 4px; }
  ::selection { color: var(--ink); background: var(--ice); }
  [id] { scroll-margin-top: 82px; }
  code { padding: 2px 5px; background: var(--stone); font-size: .85em; }
}

@layer components {
  .shell { width: min(calc(100% - 48px), var(--shell)); margin-inline: auto; }
  .narrow { max-width: 930px; }
  .section { position: relative; padding-block: 112px; }
  .skip-link {
    position: fixed; top: 8px; left: 8px; z-index: 200;
    transform: translateY(-150%); padding: 10px 16px; color: var(--white); background: var(--ink); text-decoration: none;
  }
  .skip-link:focus { transform: translateY(0); }
  .section-label, .section-index, .eyebrow, .card-kicker {
    font-size: .7rem; font-weight: 750; letter-spacing: .14em; line-height: 1.35; text-transform: uppercase;
  }
  .section-label, .section-index { margin-bottom: 20px; color: var(--aqua-dark); }
  .light { color: #aeeafb; }
  .eyebrow { display: flex; align-items: center; gap: 12px; margin-bottom: 24px; color: var(--aqua-dark); }
  .eyebrow span { width: 38px; height: 1px; background: currentColor; }
  .lede { color: var(--graphite); font-family: var(--serif); font-size: clamp(1.35rem, 2.2vw, 1.9rem); line-height: 1.35; }
  .text-link, .source-link, .policy-link { color: var(--ink); font-size: .82rem; font-weight: 700; text-underline-offset: 5px; }
  .text-link { text-decoration-color: var(--aqua); text-decoration-thickness: 2px; }
  .source-link { display: inline-flex; gap: 8px; margin-top: 24px; color: var(--aqua-dark); }
  .policy-link { margin-left: 20px; color: var(--graphite); }
  .button {
    display: inline-flex; min-height: 54px; align-items: center; justify-content: center; gap: 14px;
    padding: 16px 24px; border: 1px solid transparent; color: var(--ink); font-size: .88rem; font-weight: 750;
    line-height: 1.2; text-align: center; text-decoration: none; transition: transform .2s ease, box-shadow .2s ease, background-color .2s ease;
  }
  .button:hover { transform: translateY(-2px); }
  .button-primary { background: var(--aqua); box-shadow: 0 16px 34px rgba(24, 175, 229, .19); }
  .button-primary:hover { background: #43c0ec; box-shadow: 0 20px 42px rgba(24, 175, 229, .25); }
  .button-link { min-height: 54px; padding-inline: 10px; border-bottom-color: var(--ink); }
  .button-light { color: var(--ink); background: var(--white); }
  .button-note, .fine-print, .merchant-key { color: var(--muted); font-size: .72rem; line-height: 1.55; }
  .light-note { color: rgba(255,255,255,.64); }
  .brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; }
  .brand-mark {
    display: grid; width: 38px; height: 38px; flex: 0 0 38px; place-items: center; border: 1px solid var(--ink);
    border-radius: 50%; font-family: var(--serif); font-size: 1.35rem; font-style: italic;
  }
  .brand strong, .brand small { display: block; line-height: 1.1; }
  .brand strong { font-family: var(--serif); font-size: .98rem; font-weight: 600; letter-spacing: -.02em; }
  .brand small { margin-top: 4px; color: var(--muted); font-size: .68rem; }
  .reveal { opacity: 0; transform: translateY(18px); transition: opacity .72s ease, transform .72s ease; }
  .reveal.is-visible { opacity: 1; transform: none; }
  .hero .reveal { opacity: 1; transform: none; }
}

@layer layout {
  .site-header {
    position: sticky; top: 0; z-index: 50; border-bottom: 1px solid rgba(21,21,21,.1);
    background: rgba(250,248,245,.9); backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px);
  }
  .header-inner { display: flex; min-height: 76px; align-items: center; justify-content: space-between; gap: 24px; }
  .header-actions { display: flex; align-items: center; gap: 18px; }

  .hero { overflow: hidden; padding-top: 72px; padding-bottom: 38px; background: var(--ivory); }
  .hero::after { position: absolute; right: -12%; bottom: 3%; width: 48vw; height: 48vw; border: 1px solid rgba(24,175,229,.12); border-radius: 50%; content: ""; }
  .hero-grid { display: grid; grid-template-columns: 1.04fr .96fr; min-height: 660px; align-items: center; gap: 64px; }
  .hero-copy { position: relative; z-index: 2; }
  .hero h1 { max-width: 770px; }
  .hero h1 em { color: var(--aqua-dark); font-weight: 400; }
  .hero-deck { max-width: 670px; margin-top: 28px; color: var(--graphite); font-size: clamp(1.05rem, 1.5vw, 1.28rem); line-height: 1.58; }
  .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
  .hero-visual { position: relative; overflow: hidden; min-height: 620px; border-radius: 280px 280px 28px 28px; background: linear-gradient(160deg, #edf8f8 0%, #dcebed 58%, #d1dcda 100%); box-shadow: var(--shadow-soft); }
  .hero-visual::before { position: absolute; z-index: 4; inset: 24px; border: 1px solid rgba(255,255,255,.8); border-radius: inherit; pointer-events: none; content: ""; }
  .hero-media { position: absolute; z-index: 3; inset: 0; display: block; }
  .hero-product { width: 100%; height: 100%; max-width: none; object-fit: cover; object-position: center; }
  .hero-caption { position: absolute; z-index: 5; top: 38px; left: 50%; width: max-content; max-width: calc(100% - 180px); padding: 12px 16px; border-bottom: 1px solid var(--aqua-dark); background: rgba(250,248,245,.84); text-align: center; transform: translateX(-50%); backdrop-filter: blur(6px); }
  .hero-caption span, .hero-caption small { display: block; color: var(--muted); font-size: .66rem; letter-spacing: .1em; line-height: 1.4; text-transform: uppercase; }
  .hero-caption strong { display: block; margin-block: 7px; font-family: var(--serif); font-size: 1.08rem; font-weight: 500; line-height: 1.05; }
  .scroll-note { display: flex; justify-content: space-between; padding-top: 28px; border-top: 1px solid var(--line); color: var(--muted); font-size: .68rem; letter-spacing: .1em; text-transform: uppercase; }

  .quick { padding-block: 76px; background: var(--white); }
  .quick-card { display: grid; grid-template-columns: .8fr 1.2fr; gap: 70px; padding: 50px 0; border-top: 1px solid var(--ink); border-bottom: 1px solid var(--ink); }
  .quick-intro h2 { max-width: 500px; font-size: clamp(2.4rem, 3.6vw, 4rem); }
  .quick-intro > p:last-child { max-width: 550px; margin-top: 22px; color: var(--graphite); }
  .fact-grid { display: grid; grid-template-columns: repeat(3, 1fr); align-content: center; }
  .fact-grid > div { min-height: 122px; padding: 20px 22px; border-left: 1px solid var(--line); }
  .fact-grid > div:nth-child(n+4) { border-top: 1px solid var(--line); }
  .fact-grid dt { color: var(--muted); font-size: .64rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; }
  .fact-grid dd { margin-top: 18px; font-family: var(--serif); font-size: 1.2rem; line-height: 1.18; }
  .merchant-key { grid-column: 2; }

  .routine-problem { background: var(--ivory); }
  .routine-problem .narrow { text-align: center; }
  .routine-problem h2 { max-width: 850px; margin-inline: auto; }
  .routine-problem .lede { max-width: 780px; margin: 30px auto 0; }
  .shelf-comparison { margin-top: 68px; }
  .product-shelf { display: grid; grid-template-columns: repeat(9, auto); align-items: center; justify-content: center; gap: 14px; }
  .product-shelf span { display: grid; min-width: 130px; min-height: 160px; place-items: end center; padding: 22px 12px; border: 1px solid var(--line); border-radius: 70px 70px 8px 8px; background: linear-gradient(to bottom, var(--stone), var(--white)); font-size: .72rem; font-weight: 700; }
  .product-shelf b { color: var(--muted); font-family: var(--serif); font-size: 1.5rem; font-weight: 400; }
  .shelf-arrow { margin: 30px 0 18px; color: var(--aqua-dark); font-size: 1.7rem; text-align: center; }
  .one-cream { display: flex; width: min(100%, 450px); min-height: 210px; align-items: center; justify-content: center; gap: 22px; margin-inline: auto; border-bottom: 1px solid var(--ink); }
  .one-cream img { width: 180px; height: 180px; object-fit: contain; filter: drop-shadow(0 18px 18px rgba(25,45,50,.17)); }
  .one-cream small { display: block; color: var(--muted); font-size: .62rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; }
  .one-cream strong { display: block; margin-top: 4px; font-family: var(--serif); font-size: 2.1rem; font-weight: 400; }
  .consolidation-note { display: grid; grid-template-columns: .8fr 1.2fr; gap: 70px; margin-top: 72px; padding-top: 34px; border-top: 1px solid var(--line); }
  .pull-quote { font-family: var(--serif); font-size: clamp(2rem, 3vw, 3.4rem); line-height: 1.02; }
  .consolidation-note > p:last-child { max-width: 620px; color: var(--graphite); }

  .formula-intro { background: var(--white); }
  .formula-head { display: grid; grid-template-columns: 1fr 1fr; align-items: end; gap: 80px; }
  .formula-head .lede { max-width: 620px; }
  .inci-panel { margin-top: 58px; border-top: 1px solid var(--ink); border-bottom: 1px solid var(--ink); }
  .inci-panel summary { display: flex; min-height: 78px; align-items: center; justify-content: space-between; cursor: pointer; font-weight: 700; }
  .summary-icon { display: grid; width: 34px; height: 34px; place-items: center; border: 1px solid var(--line); border-radius: 50%; font-size: 1.2rem; transition: transform .2s ease; }
  .inci-panel[open] .summary-icon { transform: rotate(45deg); }
  .inci-content { padding: 28px 0 36px; border-top: 1px solid var(--line); }
  .inci-content > p:first-child { max-width: 940px; font-family: var(--serif); font-size: 1.25rem; line-height: 1.65; }
  .inci-content .fine-print { margin-top: 18px; }
  .ingredient-preview { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 64px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
  .ingredient-preview article { min-height: 280px; padding: 32px 26px; border-left: 1px solid var(--line); }
  .ingredient-preview article:first-child { border-left: 0; }
  .ingredient-preview span { color: var(--aqua-dark); font-family: var(--serif); font-size: 1.2rem; }
  .ingredient-preview small { display: block; margin-top: 66px; color: var(--muted); font-size: .75rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; }
  .ingredient-preview h3 { margin-top: 10px; font-family: var(--serif); font-size: 1.5rem; font-weight: 400; }
  .ingredient-preview p { margin-top: 8px; color: var(--graphite); font-size: .88rem; line-height: 1.55; }
  .ingredient-preview .ingredient-tag { margin-top: 14px; font-size: .78rem; font-style: italic; color: var(--muted); }

  .formula-research-wrap { margin-top: 48px; border-top: 1px solid var(--line); }
  .formula-research-wrap details { border-bottom: 1px solid var(--line); }
  .formula-research-wrap summary { display: flex; min-height: 56px; align-items: center; justify-content: space-between; gap: 16px; cursor: pointer; font-size: .88rem; font-weight: 700; color: var(--aqua-dark); }
  .formula-research-wrap summary .accordion-icon { font-size: 1.2rem; font-weight: 400; transition: transform .2s ease; }
  .formula-research-wrap details[open] summary .accordion-icon { transform: rotate(45deg); }
  .formula-research-content { padding: 16px 0 28px; font-size: .84rem; line-height: 1.65; color: var(--graphite); max-width: 840px; }
  .formula-research-content p + p { margin-top: 12px; }
  .formula-research-content a { color: inherit; text-decoration: underline; }
  .ingredient-stories { padding: 0; }
  .ingredient-story { padding-block: 120px; background: var(--ivory); }
  .ingredient-story + .ingredient-story { border-top: 1px solid var(--line); }
  .story-dark { color: var(--white); background: #18282c; }
  .story-ice { background: var(--ice); }
  .story-grid { display: grid; grid-template-columns: .92fr 1.08fr; align-items: center; gap: 100px; }
  .story-grid.reverse { grid-template-columns: 1.08fr .92fr; }
  .story-grid.reverse .story-art { order: 2; }
  .story-copy { max-width: 620px; }
  .story-copy h2 { margin-bottom: 32px; }
  .story-copy p:not(.section-index) { margin-top: 18px; color: var(--graphite); }
  .story-dark .story-copy p:not(.section-index) { color: rgba(255,255,255,.72); }
  .story-dark .source-link { color: #aeeafb; }
  .evidence-chip { width: fit-content; margin-top: 20px; padding: 6px 12px; border: 1px solid var(--line); color: var(--graphite); font-size: .72rem; }
  .story-accordion { margin-top: 24px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
  .story-dark .story-accordion { border-color: rgba(255, 255, 255, .2); }
  .story-accordion summary { display: flex; min-height: 48px; align-items: center; justify-content: space-between; gap: 14px; cursor: pointer; font-size: .82rem; font-weight: 700; color: var(--aqua-dark); }
  .story-accordion summary .accordion-icon { font-size: 1.1rem; font-weight: 400; transition: transform .2s ease; }
  .story-accordion[open] summary .accordion-icon { transform: rotate(45deg); }
  .story-accordion-content { padding: 12px 0 20px; font-size: .82rem; line-height: 1.6; color: var(--graphite); }
  .story-dark .story-accordion-content { color: rgba(255, 255, 255, .82); }
  .story-accordion-content a { color: inherit; text-decoration: underline; }
  .story-art { position: relative; overflow: hidden; min-height: 520px; border-radius: 260px 260px 18px 18px; background: var(--stone); }
  .story-art img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
  .story-art b { position: absolute; z-index: 2; right: 8%; bottom: 6%; padding: 7px 10px; color: var(--ink); background: rgba(255,255,255,.78); font-size: .62rem; letter-spacing: .22em; }
  .teprenone-art img { object-position: center 56%; }
  .peptide-art img { object-position: center; }
  .hydration-art img { object-position: center; }
  .glycerin-art img { object-position: center; }

  .formula-visual { color: var(--white); background: #12262c; }
  .formula-composition { display: grid; grid-template-columns: .8fr 1.2fr; min-height: 680px; align-items: stretch; }
  .composition-copy { display: flex; flex-direction: column; justify-content: center; padding: 64px 76px 64px 0; }
  .composition-copy p:not(.section-label) { max-width: 530px; margin-top: 24px; color: rgba(255,255,255,.7); }
  .formula-legend { display: grid; gap: 10px; margin-top: 32px; color: rgba(255,255,255,.72); font-size: .72rem; }
  .formula-legend span { display: flex; align-items: center; gap: 10px; }
  .dot { width: 8px; height: 8px; border-radius: 50%; }
  .dot.aqua { background: var(--aqua); }.dot.coral { background: var(--watermelon); }.dot.stone { background: var(--stone); }
  .composition-art { position: relative; overflow: hidden; min-height: 680px; background: linear-gradient(145deg, #dbeff2, #8bbfc8); }
  .composition-art img { position: absolute; z-index: 2; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: center 64%; }
  .ribbon { position: absolute; z-index: 3; width: 70%; height: 18%; border: 1px solid rgba(255,255,255,.32); border-radius: 50%; pointer-events: none; }
  .ribbon-one { top: 15%; right: -20%; transform: rotate(24deg); }.ribbon-two { bottom: 10%; left: -18%; transform: rotate(-18deg); }

  .routine { background: var(--stone); }
  .routine-grid { display: grid; grid-template-columns: .76fr 1.24fr; gap: 90px; }
  .routine-intro { position: sticky; top: 120px; align-self: start; }
  .routine-intro h2 { max-width: 520px; }
  .routine-intro > p:not(.section-index) { max-width: 510px; margin-top: 25px; color: var(--graphite); }
  .merchant-note { padding-top: 22px; border-top: 1px solid var(--line); font-size: .82rem; }
  .routine-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
  .routine-card { position: relative; overflow: hidden; min-height: 430px; padding: 32px; border: 1px solid var(--line); color: var(--white); background-position: center; background-size: cover; }
  .routine-card::before { position: absolute; inset: 0; background: linear-gradient(to bottom, rgba(10,24,28,.16), rgba(10,24,28,.88)); content: ""; }
  .routine-card > * { position: relative; z-index: 1; }
  .routine-card.morning { background-image: url("assets/idrotherapy-morning-routine.webp"); }
  .routine-card.evening { background-image: url("assets/idrotherapy-evening-routine.webp"); }
  .routine-time { display: flex; align-items: center; justify-content: space-between; }
  .routine-time span { font-family: var(--serif); font-size: 2rem; }.routine-time small { font-size: .68rem; font-weight: 700; letter-spacing: .12em; }
  .routine-card h3 { margin-top: 55px; font-family: var(--serif); font-size: 2.2rem; font-weight: 400; }
  .routine-card ol { margin-top: 38px; list-style: none; }
  .routine-card li { display: flex; align-items: center; gap: 14px; padding-block: 16px; border-top: 1px solid var(--line-light); }
  .routine-card li span { display: grid; width: 28px; height: 28px; place-items: center; border: 1px solid currentColor; border-radius: 50%; font-size: .66rem; }
  .dose-note { display: flex; grid-column: 1 / -1; align-items: center; gap: 20px; margin-top: 12px; padding: 26px 28px; border-top: 1px solid var(--ink); border-bottom: 1px solid var(--ink); }
  .pea { width: 28px; height: 28px; flex: 0 0 28px; border-radius: 50%; background: var(--aqua); box-shadow: inset 4px 5px 8px rgba(255,255,255,.45); }
  .dose-note p { font-size: .78rem; line-height: 1.5; }

  .use-cases { background: var(--white); }
  .use-head { display: grid; grid-template-columns: 1.2fr .8fr; align-items: end; gap: 80px; }
  .use-head h2 { max-width: 760px; }
  .use-head > p { max-width: 480px; padding-bottom: 8px; color: var(--graphite); }
  .use-grid { display: grid; grid-template-columns: repeat(4, 1fr); margin-top: 66px; }
  .use-card { position: relative; display: flex; overflow: hidden; min-height: 430px; flex-direction: column; justify-content: space-between; padding: 24px; border-left: 1px solid rgba(255,255,255,.3); color: var(--white); background-size: cover; background-position: center; }
  .use-card::before { position: absolute; inset: 0; background: linear-gradient(to bottom, rgba(12,26,31,.1), rgba(12,26,31,.8)); content: ""; }
  .use-card > * { position: relative; z-index: 1; }
  .use-card > span { font-family: var(--serif); font-size: 1.1rem; }
  .use-card h3 { font-family: var(--serif); font-size: 1.8rem; font-weight: 400; }
  .use-card p { margin-top: 6px; color: rgba(255,255,255,.73); font-size: .74rem; }
  .use-card.face { background-image: url("assets/idrotherapy-morning-routine.webp"); background-position: 58% center; }
  .use-card.eye { background-image: url("assets/mature-skin-texture.webp"); background-position: 38% center; }
  .use-card.neck { background-image: url("assets/idrotherapy-neck-application.webp"); background-position: center; }
  .use-card.hands { background-image: url("assets/idrotherapy-hand-application.webp"); background-position: center; }

  .balanced { background: var(--ivory); }
  .balanced-head { display: flex; align-items: end; justify-content: space-between; gap: 40px; padding-bottom: 34px; border-bottom: 1px solid var(--ink); }
  .balanced-head .section-label { margin-bottom: 10px; }
  .balance-grid { display: grid; grid-template-columns: 1fr 1fr; }
  .balance-card { padding: 44px 56px 50px; }
  .balance-card + .balance-card { border-left: 1px solid var(--line); }
  .balance-card ul, .fit-lists ul { margin-top: 28px; list-style: none; }
  .balance-card li, .fit-lists li { position: relative; padding: 13px 0 13px 28px; border-top: 1px solid var(--line); color: var(--graphite); }
  .balance-card li::before { position: absolute; top: 17px; left: 2px; color: var(--aqua-dark); content: "＋"; }
  .cautious li::before { color: var(--watermelon); content: "—"; }

  .fit { padding: 0; background: var(--white); }
  .fit-grid { width: 100%; max-width: none; display: grid; grid-template-columns: .84fr 1.16fr; }
  .fit-portrait { position: relative; min-height: 900px; }
  .fit-portrait::after { position: absolute; inset: 0; background: linear-gradient(to bottom, transparent 65%, rgba(11,25,29,.6)); content: ""; }
  .fit-portrait img { width: 100%; height: 100%; object-fit: cover; object-position: center; }
  .fit-portrait p { position: absolute; z-index: 1; bottom: 32px; left: 32px; color: var(--white); font-family: var(--serif); font-size: 1.5rem; }
  .fit-copy { display: flex; flex-direction: column; justify-content: center; padding: 90px max(5vw, 54px); }
  .fit-copy h2 { max-width: 700px; }
  .fit-lists { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; margin-top: 60px; }
  .fit-lists h3 { font-family: var(--serif); font-size: 1.55rem; font-weight: 400; }
  .fit-lists li { padding-left: 0; font-size: .82rem; }

  .verdict { background: var(--stone); }
  .verdict-card { max-width: 980px; padding: 74px 86px; border: 1px solid var(--ink); background: var(--ivory); box-shadow: 22px 22px 0 var(--ice); }
  .verdict-mark { float: right; height: 70px; color: var(--aqua); font-family: var(--serif); font-size: 7rem; line-height: 1; }
  .verdict-card h2 { margin-bottom: 34px; }
  .verdict-copy { font-family: var(--serif); font-size: clamp(1.45rem, 2.3vw, 2rem); line-height: 1.38; }
  .verdict-card > p:not(.section-label):not(.verdict-copy):not(.button-note) { margin-top: 22px; color: var(--graphite); }
  .verdict-card .button { margin-top: 34px; }.verdict-card .button-note { margin-top: 10px; }

  .offer { background: var(--white); }
  .offer-grid { display: grid; grid-template-columns: .82fr 1.18fr; align-items: center; gap: 90px; }
  .offer-intro h2 { max-width: 540px; }
  .offer-intro > p:not(.section-index) { max-width: 500px; margin-top: 26px; color: var(--graphite); }
  .offer-assurance { display: flex; align-items: center; gap: 15px; margin-top: 36px; padding-top: 24px; border-top: 1px solid var(--line); }
  .offer-assurance > span { display: grid; width: 34px; height: 34px; place-items: center; border-radius: 50%; background: var(--ice); color: var(--aqua-dark); }
  .offer-assurance p { margin: 0 !important; font-size: .75rem; }
  .offer-card { padding: 26px; border: 1px solid var(--line); background: var(--ivory); box-shadow: var(--shadow-soft); }
  .offer-row { position: relative; display: grid; grid-template-columns: 190px 1fr; min-height: 150px; align-items: center; gap: 22px; padding: 12px 20px; border-top: 1px solid var(--line); }
  .offer-row:first-child { border-top: 0; }
  .offer-row.featured { margin-inline: -12px; padding-inline: 32px; border: 1px solid var(--aqua); background: var(--white); }
  .offer-row img { width: 190px; height: 105px; object-fit: contain; }
  .offer-row small, .offer-row span { display: block; color: var(--muted); font-size: .66rem; letter-spacing: .04em; }
  .offer-row strong { display: block; font-family: var(--serif); font-size: 2rem; font-weight: 400; line-height: 1.05; }
  .offer-row .best-tag { position: absolute; top: 9px; right: 12px; color: var(--aqua-dark); font-size: .58rem; font-weight: 750; letter-spacing: .1em; text-transform: uppercase; }
  .offer-card .button { width: 100%; margin-top: 24px; }.offer-card .button-note { margin-top: 10px; text-align: center; }

  .guarantee { color: var(--white); background-color: #14272c; background-image: linear-gradient(90deg, #14272c 0%, #14272c 58%, rgba(20,39,44,.92) 78%, rgba(20,39,44,.72) 100%), url("assets/idrotherapy-guarantee-product.webp"); background-position: center, right center; background-size: cover, auto 100%; background-repeat: no-repeat; }
  .guarantee-card { display: grid; grid-template-columns: .42fr 1.58fr; align-items: center; gap: 70px; }
  .guarantee-number { border-right: 1px solid var(--line-light); color: var(--aqua); font-family: var(--serif); font-size: clamp(6rem, 11vw, 11rem); line-height: .8; }
  .guarantee-card h2 { max-width: 650px; }.guarantee-card p:not(.section-label) { max-width: 690px; margin: 26px 0; color: rgba(255,255,255,.7); }
  .guarantee .text-link { color: var(--white); }.guarantee .policy-link { color: rgba(255,255,255,.68); }

  .faq { background: var(--ivory); }
  .faq-grid { display: grid; grid-template-columns: .7fr 1.3fr; gap: 90px; }
  .faq-intro { position: sticky; top: 120px; align-self: start; }.faq-intro h2 { max-width: 480px; }.faq-intro > p:last-child { margin-top: 24px; color: var(--graphite); }
  .faq-list { border-top: 1px solid var(--ink); }
  .faq-list details { border-bottom: 1px solid var(--line); }
  .faq-list summary { display: flex; min-height: 74px; align-items: center; justify-content: space-between; gap: 20px; cursor: pointer; font-family: var(--serif); font-size: 1.28rem; }
  .faq-list summary span { font-family: var(--sans); font-size: 1.2rem; font-weight: 300; transition: transform .2s ease; }
  .faq-list details[open] summary span { transform: rotate(45deg); }
  .faq-list details p { max-width: 700px; padding: 2px 46px 28px 0; color: var(--graphite); font-size: .87rem; }

  .final-cta { padding-block: 90px; color: var(--ink); background: var(--ice); }
  .final-card { position: relative; overflow: hidden; display: block; min-height: 520px; padding: 72px; border-radius: 24px; background: var(--ivory); box-shadow: var(--shadow-soft); }
  .final-card::after { position: absolute; z-index: 1; inset: 0; background: linear-gradient(90deg, rgba(250,248,245,.98) 0%, rgba(250,248,245,.94) 38%, rgba(250,248,245,.25) 67%, transparent 100%); pointer-events: none; content: ""; }
  .final-card > img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: center; }
  .final-card > div { position: relative; z-index: 2; max-width: 540px; }
  .final-card h2 { max-width: 540px; }.final-card > div > p:not(.section-label):not(.button-note) { max-width: 500px; margin-top: 22px; color: var(--graphite); }
  .final-card .button { margin-top: 30px; }.final-card .button-note { margin-top: 10px; }

  .sources { padding-block: 80px; background: var(--stone); }
  .sources-grid { display: grid; grid-template-columns: .7fr 1.3fr; gap: 90px; }
  .sources h2 { font-size: clamp(2.3rem, 3.6vw, 3.7rem); }.sources-grid > div > p:last-child { max-width: 500px; margin-top: 24px; color: var(--graphite); }
  .sources ol { padding-left: 22px; }
  .sources li { padding: 12px 0 12px 8px; border-top: 1px solid var(--line); color: var(--graphite); font-size: .78rem; }
  .sources li:first-child { border-top-color: var(--ink); }.sources a { color: var(--ink); font-weight: 700; text-underline-offset: 4px; }

  .site-footer { padding-block: 60px 28px; color: var(--white); background: var(--ink); }
  .footer-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; }
  .footer-brand .brand-mark { border-color: var(--white); }.footer-brand small { color: rgba(255,255,255,.55); }
  .legal-line { margin-top: 48px; padding-top: 24px; border-top: 1px solid rgba(255,255,255,.15); }
  .legal-line p { max-width: 900px; margin-top: 8px; color: rgba(255,255,255,.48); font-size: .66rem; }

  .mobile-sticky { display: none; }
  .noscript { position: fixed; right: 10px; bottom: 10px; z-index: 100; max-width: 400px; padding: 12px; color: var(--white); background: var(--ink); font-size: .7rem; }
}

@layer responsive {
  @media (max-width: 1050px) {
    .hero-grid { gap: 30px; }
    .hero-visual { min-height: 560px; }
    .product-shelf span { min-width: 102px; }
    .story-grid, .story-grid.reverse { gap: 56px; }
    .offer-grid, .faq-grid, .routine-grid { gap: 55px; }
    .use-card { min-height: 350px; }
  }

  @media (max-width: 820px) {
    .section { padding-block: 82px; }
    .hero-grid, .quick-card, .formula-head, .story-grid, .story-grid.reverse, .formula-composition, .routine-grid, .use-head, .fit-grid, .offer-grid, .faq-grid, .sources-grid { grid-template-columns: 1fr; }
    .hero-grid { min-height: auto; }
    .hero-copy { max-width: 690px; }
    .hero-visual { width: min(100%, 620px); margin-inline: auto; }
    .merchant-key { grid-column: auto; }
    .quick-card { gap: 45px; }
    .formula-head { gap: 32px; }
    .story-grid.reverse .story-art { order: 0; }
    .story-art { min-height: 430px; }
    .composition-copy { padding: 70px 0; }
    .composition-art { min-height: 560px; }
    .routine-intro, .faq-intro { position: static; }
    .use-head { gap: 28px; }
    .use-grid { grid-template-columns: 1fr 1fr; }
    .use-card { min-height: 430px; }
    .fit-portrait { min-height: 680px; }
    .fit-copy { padding: 80px 44px; }
    .offer-intro { padding-bottom: 20px; }
    .guarantee-card { grid-template-columns: .5fr 1.5fr; gap: 40px; }
    .final-card { grid-template-columns: .6fr 1.4fr; gap: 35px; }
  }

  @media (max-width: 600px) {
    :root { --shadow-soft: 0 14px 38px rgba(34,30,27,.08); }
    body { font-size: 17px; line-height: 1.6; }
    h1 { font-size: clamp(2.55rem, 11.5vw, 3.2rem); line-height: .99; }
    h2 { font-size: clamp(2.35rem, 11.2vw, 3.15rem); line-height: 1; }
    .shell { width: min(calc(100% - 40px), var(--shell)); }
    .section { padding-block: 68px; }
    .site-header { position: relative; }
    .header-inner { min-height: 98px; flex-wrap: wrap; gap: 8px; padding-block: 11px; }
    .brand { gap: 9px; }
    .brand-mark { width: 34px; height: 34px; flex-basis: 34px; font-size: 1.15rem; }
    .brand strong { font-size: .88rem; }
    .brand small { display: none; }
    .header-actions { width: 100%; justify-content: space-between; gap: 14px; padding-top: 8px; border-top: 1px solid var(--line); }
    .header-actions .text-link { max-width: none; min-height: 28px; display: inline-flex; align-items: center; font-size: .72rem; line-height: 1.2; text-align: right; }

    .hero { padding-top: 36px; padding-bottom: 28px; }
    .hero-grid { gap: 18px; }
    .hero-copy { display: contents; }
    .hero-copy .eyebrow, .hero-copy h1, .hero-copy .hero-deck { order: 1; }
    .hero-visual { order: 2; }
    .hero-actions { order: 3; }
    .eyebrow { margin-bottom: 8px; }
    .hero-deck { margin-top: 4px; font-size: .96rem; line-height: 1.48; }
    .hero-actions { display: flex; align-items: center; margin-top: 6px; }
    .hero-actions .button { min-height: 52px; padding: 13px 16px; font-size: .78rem; }
    .hero-actions .button-primary { flex: 1 1 215px; }
    .hero-actions .button-link { flex: 0 1 auto; min-height: 44px; padding-inline: 4px; border-bottom-color: transparent; font-size: .72rem; text-decoration: underline; text-underline-offset: 5px; }
    .hero-visual { width: 100%; min-height: 340px; margin-top: 6px; border-radius: 150px 150px 14px 14px; }
    .hero-visual::before { inset: 11px; }
    .hero-product { object-position: center 58%; }
    .hero-caption { display: none; }
    .scroll-note { padding-top: 18px; font-size: .58rem; }

    .quick { padding-block: 48px; }
    .quick-card { gap: 35px; padding: 34px 0; }
    .quick-intro h2 { font-size: 2.55rem; }
    .quick-intro > p:last-child { margin-top: 18px; }
    .fact-grid { grid-template-columns: 1fr 1fr; }
    .fact-grid > div { min-height: 105px; padding: 16px; border-top: 1px solid var(--line); }
    .fact-grid > div:nth-child(odd) { border-left: 0; }
    .fact-grid dd { margin-top: 11px; font-size: 1.05rem; }

    .routine-problem .lede { margin-top: 22px; font-size: 1.2rem; }
    .shelf-comparison { margin-top: 44px; }
    .product-shelf { grid-template-columns: repeat(5, 1fr); gap: 6px; }
    .product-shelf b { display: none; }
    .product-shelf span { min-width: 0; min-height: 106px; padding: 14px 4px; border-radius: 45px 45px 6px 6px; font-size: .55rem; text-align: center; }
    .one-cream { min-height: 160px; }
    .one-cream img { width: 140px; height: 140px; }.one-cream strong { font-size: 1.7rem; }
    .consolidation-note { grid-template-columns: 1fr; gap: 24px; margin-top: 46px; }
    .pull-quote { font-size: 2.35rem; }

    .formula-head { gap: 24px; }
    .formula-head .lede { font-size: 1.2rem; }
    .inci-panel { margin-top: 40px; }
    .inci-panel summary { min-height: 68px; font-size: .9rem; }
    .inci-content > p:first-child { font-size: 1.03rem; line-height: 1.55; }
    .ingredient-preview { grid-template-columns: 1fr; margin-top: 44px; }
    .ingredient-preview article { min-height: auto; padding: 22px 18px; border-top: 1px solid var(--line); border-left: 0; }
    .ingredient-preview small { margin-top: 14px; }
    .ingredient-preview small { margin-top: 14px; font-size: .74rem; }

    .ingredient-story { padding-block: 70px; }
    .story-grid, .story-grid.reverse { gap: 42px; }
    .story-art { min-height: 350px; border-radius: 180px 180px 14px 14px; }
    .story-copy h2 { margin-bottom: 22px; }
    .story-copy p:not(.section-index) { margin-top: 14px; }

    .formula-visual { padding-block: 0; }
    .composition-copy { padding: 70px 0 48px; }
    .composition-art { min-height: 390px; margin-inline: -20px; }

    .routine-grid { gap: 38px; }
    .routine-cards { grid-template-columns: 1fr; }
    .routine-card { min-height: 360px; }
    .routine-card h3 { margin-top: 38px; }
    .dose-note { grid-column: auto; padding-inline: 10px; }

    .use-grid { margin-top: 42px; }
    .use-card { min-height: 310px; padding: 16px; }
    .use-card h3 { font-size: 1.3rem; }

    .balanced-head { display: block; }
    .balance-grid { grid-template-columns: 1fr; }
    .balance-card { padding: 34px 0; }
    .balance-card + .balance-card { border-top: 1px solid var(--line); border-left: 0; }

    .fit-portrait { min-height: 520px; }
    .fit-copy { padding: 68px 20px; }
    .fit-lists { grid-template-columns: 1fr; gap: 40px; margin-top: 44px; }

    .verdict-card { padding: 42px 24px; box-shadow: 10px 10px 0 var(--ice); }
    .verdict-mark { font-size: 5rem; }
    .verdict-copy { font-size: 1.25rem; }
    .verdict-card .button { width: 100%; padding-inline: 13px; font-size: .78rem; }

    .offer-grid { gap: 30px; }
    .offer-card { margin-inline: -8px; padding: 14px; }
    .offer-row { grid-template-columns: 126px 1fr; min-height: 132px; gap: 10px; padding-inline: 8px; }
    .offer-row img { width: 126px; height: 90px; }
    .offer-row.featured { margin-inline: -7px; padding-inline: 15px; }
    .offer-row strong { font-size: 1.65rem; }
    .offer-row .best-tag { top: 6px; right: 7px; font-size: .5rem; }

    .guarantee-card { grid-template-columns: 1fr; gap: 30px; }
    .guarantee-number { padding-bottom: 25px; border-right: 0; border-bottom: 1px solid var(--line-light); font-size: 7rem; }
    .guarantee .policy-link { display: inline-block; margin: 16px 0 0; }

    .faq-grid { gap: 36px; }
    .faq-list summary { min-height: 68px; font-size: 1.08rem; }
    .faq-list details p { padding-right: 0; }

    .final-cta { padding-bottom: 0; }
    .final-card { display: grid; min-height: 0; grid-template-columns: 1fr; gap: 16px; padding: 0; border-radius: 20px 20px 0 0; box-shadow: none; }
    .final-card::after { display: none; }
    .final-card > div { padding: 42px 22px 30px; }
    .final-card > img { position: static; order: 2; width: 100%; height: 300px; margin-inline: auto; object-position: center; border-radius: 170px 170px 0 0; }
    .final-card .button { width: 100%; }

    .sources-grid { gap: 38px; }
    .footer-grid { grid-template-columns: 1fr; gap: 38px; }

    .mobile-sticky {
      position: fixed; right: 12px; bottom: 12px; left: 12px; z-index: 60; display: flex; min-height: 62px;
      align-items: center; justify-content: space-between; gap: 14px; padding: 9px 10px 9px 16px; border: 1px solid rgba(255,255,255,.18);
      color: var(--white); background: rgba(21,21,21,.94); box-shadow: 0 16px 38px rgba(0,0,0,.25); opacity: 0; pointer-events: none; transform: translateY(120%); transition: opacity .25s ease, transform .25s ease;
    }
    .mobile-sticky.is-active { opacity: 1; pointer-events: auto; transform: none; }
    .mobile-sticky small, .mobile-sticky strong { display: block; line-height: 1.2; }
    .mobile-sticky small { color: rgba(255,255,255,.55); font-size: .58rem; letter-spacing: .09em; text-transform: uppercase; }
    .mobile-sticky strong { margin-top: 3px; font-size: .75rem; }
    .mobile-sticky a { display: grid; min-width: 92px; min-height: 44px; place-items: center; color: var(--ink); background: var(--aqua); font-size: .74rem; font-weight: 750; text-decoration: none; }
  }

  @media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
    .reveal { opacity: 1; transform: none; }
  }
}