/* ==========================================================
   XEROMIND LABS — design system
   Palette: fresh light mint · black · cream white
   ========================================================== */

:root {
  --mint-50:  #F4FCF8;
  --mint-100: #E4F7EE;
  --mint-200: #C6EFDD;
  --mint-300: #9FE5C7;
  --mint:     #7DDCB4;
  --mint-600: #3FBF8F;
  --mint-700: #2A9970;

  --cream:    #FBF8F1;
  --cream-2:  #F4EFE3;
  --cream-3:  #E8E1D2;

  --ink:      #0C0C0C;
  --ink-2:    #1A1C1B;
  --ink-60:   rgba(12,12,12,.62);
  --ink-40:   rgba(12,12,12,.42);
  --ink-12:   rgba(12,12,12,.12);
  --ink-08:   rgba(12,12,12,.08);

  --radius:   14px;
  --radius-lg:22px;
  --maxw:     1180px;

  --shadow-sm: 0 1px 2px rgba(12,12,12,.05), 0 4px 12px rgba(12,12,12,.04);
  --shadow-md: 0 2px 6px rgba(12,12,12,.06), 0 18px 40px rgba(12,12,12,.08);
  --shadow-lg: 0 30px 80px rgba(12,12,12,.16);

  --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  --serif: 'Instrument Serif', 'Iowan Old Style', Georgia, 'Times New Roman', serif;
  --mono: 'SF Mono', ui-monospace, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sans);
  background: var(--cream);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  font-size: 16px;
  line-height: 1.6;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

h1, h2, h3, h4 { margin: 0 0 .5em; line-height: 1.12; font-weight: 600; letter-spacing: -.02em; }
h1 { font-size: clamp(2.4rem, 6vw, 4.1rem); }
h2 { font-size: clamp(1.8rem, 3.6vw, 2.6rem); }
h3 { font-size: 1.15rem; }
p  { margin: 0 0 1em; }

.serif { font-family: var(--serif); font-weight: 400; letter-spacing: -.01em; }

.eyebrow {
  font-size: .72rem; font-weight: 600; letter-spacing: .16em;
  text-transform: uppercase; color: var(--mint-700);
  display: flex; align-items: center; gap: 10px; margin-bottom: 18px;
}
.eyebrow::before {
  content: ''; width: 26px; height: 1.5px; background: var(--mint-600); display: block;
}
.eyebrow.center { justify-content: center; }

.lede { font-size: 1.12rem; color: var(--ink-60); max-width: 58ch; }

/* ---------- Logo ---------- */
.logo { display: flex; align-items: center; gap: 11px; }
.logo svg { width: 34px; height: 34px; flex: none; }
.logo-text { display: flex; flex-direction: column; line-height: 1; }
.logo-name {
  font-family: var(--serif); font-size: 1.32rem; letter-spacing: .01em;
}
.logo-name b { font-weight: 400; }
.logo-sub {
  font-size: .56rem; letter-spacing: .3em; text-transform: uppercase;
  color: var(--ink-40); margin-top: 4px; font-weight: 600;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 60;
  background: rgba(251,248,241,.82);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--ink-08);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 74px; gap: 24px;
}
.nav { display: flex; align-items: center; gap: 30px; }
.nav a {
  font-size: .9rem; font-weight: 500; color: var(--ink-60);
  transition: color .18s; position: relative; padding: 4px 0;
}
.nav a:hover, .nav a.active { color: var(--ink); }
.nav a.active::after {
  content: ''; position: absolute; left: 0; right: 0; bottom: -2px;
  height: 2px; background: var(--mint-600); border-radius: 2px;
}
.header-actions { display: flex; align-items: center; gap: 12px; }

.cart-btn {
  display: inline-flex; align-items: center; gap: 9px;
  background: var(--ink); color: var(--cream);
  border: none; cursor: pointer; font-family: inherit;
  font-size: .87rem; font-weight: 500;
  padding: 11px 18px; border-radius: 999px;
  transition: transform .15s, background .18s;
}
.cart-btn:hover { transform: translateY(-1px); background: var(--ink-2); }
.cart-count {
  background: var(--mint); color: var(--ink);
  min-width: 20px; height: 20px; border-radius: 999px;
  display: grid; place-items: center;
  font-size: .72rem; font-weight: 700; padding: 0 6px;
}

.menu-toggle {
  display: none; background: none; border: none; cursor: pointer;
  padding: 8px; color: var(--ink);
}

/* ---------- Announcement bar ---------- */
.announce {
  background: var(--ink); color: var(--mint-200);
  font-size: .76rem; letter-spacing: .06em; text-transform: uppercase;
  font-weight: 500; text-align: center; padding: 9px 16px;
}
.announce b { color: var(--mint); font-weight: 700; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  font-family: inherit; font-size: .93rem; font-weight: 600;
  padding: 14px 26px; border-radius: 999px; border: 1.5px solid transparent;
  cursor: pointer; transition: transform .15s, background .18s, border-color .18s, color .18s;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--ink); color: var(--cream); }
.btn-primary:hover { background: var(--ink-2); }
.btn-mint { background: var(--mint); color: var(--ink); }
.btn-mint:hover { background: var(--mint-300); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--ink-12); }
.btn-ghost:hover { border-color: var(--ink); }
.btn-block { width: 100%; }
.btn:disabled { opacity: .45; cursor: not-allowed; transform: none; }

/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; padding: 88px 0 76px; }
.hero::before {
  content: ''; position: absolute; inset: 0;
  background:
    radial-gradient(900px 520px at 78% 8%,  var(--mint-100) 0%, transparent 62%),
    radial-gradient(700px 420px at 4% 92%, var(--mint-50) 0%, transparent 60%);
  pointer-events: none;
}
.hero .wrap { position: relative; }
.hero-grid {
  display: grid; grid-template-columns: 1.08fr .92fr; gap: 60px; align-items: center;
}
.hero h1 { margin-bottom: 22px; }
.hero h1 em { font-family: var(--serif); font-style: normal; color: var(--mint-700); }
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 32px; }

.hero-mark {
  position: relative; aspect-ratio: 1; display: grid; place-items: center;
}
.hero-mark svg { width: 78%; height: auto; }
.hero-mark::after {
  content: ''; position: absolute; inset: 8%;
  border-radius: 50%; border: 1px dashed var(--mint-300);
  animation: spin 60s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- Trust strip ---------- */
.trust {
  border-top: 1px solid var(--ink-08); border-bottom: 1px solid var(--ink-08);
  background: var(--cream-2);
}
.trust-grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
}
.trust-item {
  padding: 30px 22px; text-align: center;
  border-right: 1px solid var(--ink-08);
}
.trust-item:last-child { border-right: none; }
.trust-num {
  font-family: var(--serif); font-size: 2.1rem; line-height: 1;
  color: var(--ink); margin-bottom: 8px; display: block;
}
.trust-num span { color: var(--mint-600); }
.trust-label {
  font-size: .74rem; letter-spacing: .12em; text-transform: uppercase;
  color: var(--ink-40); font-weight: 600;
}

/* ---------- Sections ---------- */
.section { padding: 84px 0; }
.section-alt { background: var(--mint-50); }
.section-head { max-width: 62ch; margin-bottom: 44px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }

/* ---------- Cards ---------- */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.card {
  background: #fff; border: 1px solid var(--ink-08);
  border-radius: var(--radius-lg); padding: 30px;
  box-shadow: var(--shadow-sm);
}
.card-icon {
  width: 44px; height: 44px; border-radius: 12px;
  background: var(--mint-100); color: var(--mint-700);
  display: grid; place-items: center; margin-bottom: 18px;
}
.card p { color: var(--ink-60); font-size: .94rem; margin: 0; }

/* ---------- Shop toolbar ---------- */
.shop-head { padding: 52px 0 26px; }
.toolbar {
  display: flex; gap: 14px; align-items: center; flex-wrap: wrap;
  padding-bottom: 22px; margin-bottom: 30px;
  border-bottom: 1px solid var(--ink-08);
}
.search-box { position: relative; flex: 1; min-width: 220px; }
.search-box svg { position: absolute; left: 15px; top: 50%; transform: translateY(-50%); color: var(--ink-40); }
.search-box input {
  width: 100%; font-family: inherit; font-size: .93rem;
  padding: 13px 16px 13px 42px; border-radius: 999px;
  border: 1px solid var(--ink-12); background: #fff; color: var(--ink);
  outline: none; transition: border-color .18s, box-shadow .18s;
}
.search-box input:focus { border-color: var(--mint-600); box-shadow: 0 0 0 4px var(--mint-100); }

.chips { display: flex; gap: 8px; flex-wrap: wrap; }
.chip {
  font-family: inherit; font-size: .82rem; font-weight: 500;
  padding: 9px 15px; border-radius: 999px; cursor: pointer;
  border: 1px solid var(--ink-12); background: #fff; color: var(--ink-60);
  transition: all .16s; white-space: nowrap;
}
.chip:hover { border-color: var(--ink-40); color: var(--ink); }
.chip.active { background: var(--ink); border-color: var(--ink); color: var(--cream); }

/* ---------- Product grid ---------- */
.grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(288px, 1fr));
  gap: 20px; padding-bottom: 60px;
}
.product {
  background: #fff; border: 1px solid var(--ink-08);
  border-radius: var(--radius-lg); padding: 24px;
  display: flex; flex-direction: column;
  transition: transform .2s, box-shadow .2s, border-color .2s;
}
.product:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: var(--mint-300); }

.product-top { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; }
.product-cat {
  font-size: .66rem; letter-spacing: .13em; text-transform: uppercase;
  font-weight: 700; color: var(--mint-700);
}
.purity-tag {
  font-size: .66rem; font-weight: 700; letter-spacing: .04em;
  background: var(--mint-100); color: var(--mint-700);
  padding: 5px 9px; border-radius: 999px; white-space: nowrap;
}
.product h3 { margin: 12px 0 3px; font-size: 1.3rem; letter-spacing: -.025em; }
.product-dose {
  font-family: var(--mono); font-size: .78rem; color: var(--ink-40);
  letter-spacing: .04em; margin-bottom: 12px;
}
.product-blurb {
  font-size: .86rem; color: var(--ink-60); line-height: 1.55;
  margin: 0 0 20px; flex: 1;
}

/* Bulk price block — per-vial figure is the hero */
.price-block {
  display: flex; align-items: stretch; gap: 0;
  border: 1.5px solid var(--mint-200); border-radius: 14px;
  overflow: hidden; margin-bottom: 10px; background: var(--mint-50);
}
.price-per {
  flex: 1.25; padding: 14px 8px 13px; text-align: center;
  background: var(--mint-100);
  display: flex; flex-direction: column; justify-content: center;
}
.price-per-num {
  display: block; font-size: 1.72rem; font-weight: 700;
  letter-spacing: -.035em; color: var(--mint-700); line-height: 1.05;
}
.price-per-unit {
  display: block; font-size: .63rem; font-weight: 700;
  letter-spacing: .13em; text-transform: uppercase;
  color: var(--mint-700); opacity: .75; margin-top: 4px;
}
.price-pack {
  flex: 1; padding: 14px 8px 13px; text-align: center;
  border-left: 1.5px solid var(--mint-200);
  display: flex; flex-direction: column; justify-content: center;
}
.price-pack-total {
  display: block; font-size: 1.2rem; font-weight: 700;
  letter-spacing: -.03em; color: var(--ink); line-height: 1.05;
}
.price-pack-label {
  display: block; font-size: .63rem; font-weight: 700;
  letter-spacing: .11em; text-transform: uppercase;
  color: var(--ink-40); margin-top: 5px;
}
.price-save {
  font-size: .74rem; color: var(--ink-40);
  text-align: center; margin-bottom: 16px;
}
.price-save s { opacity: .8; }
.price-save b { color: var(--mint-700); font-weight: 700; }

.add-btn {
  background: var(--ink); color: var(--cream);
  border: none; font-family: inherit; font-size: .89rem; font-weight: 600;
  padding: 13px 20px; border-radius: 999px; cursor: pointer;
  transition: background .18s, transform .15s;
}
.add-btn.btn-block { width: 100%; display: block; }
.add-btn:hover { background: var(--mint-700); transform: translateY(-1px); }
.add-btn.added { background: var(--mint-600); }

.empty-state { text-align: center; padding: 70px 20px; color: var(--ink-40); }

/* ---------- Cart drawer ---------- */
.overlay {
  position: fixed; inset: 0; background: rgba(12,12,12,.42);
  opacity: 0; pointer-events: none; transition: opacity .28s; z-index: 90;
  backdrop-filter: blur(2px);
}
.overlay.open { opacity: 1; pointer-events: auto; }

.drawer {
  position: fixed; top: 0; right: 0; bottom: 0; width: min(430px, 100%);
  background: var(--cream); z-index: 100;
  transform: translateX(100%); transition: transform .32s cubic-bezier(.4,0,.2,1);
  display: flex; flex-direction: column; box-shadow: var(--shadow-lg);
}
.drawer.open { transform: translateX(0); }
.drawer-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 22px 24px; border-bottom: 1px solid var(--ink-08);
}
.drawer-head h3 { margin: 0; font-size: 1.1rem; letter-spacing: -.02em; }
.icon-btn {
  background: none; border: none; cursor: pointer; color: var(--ink-60);
  padding: 6px; border-radius: 8px; display: grid; place-items: center;
  transition: background .16s, color .16s;
}
.icon-btn:hover { background: var(--ink-08); color: var(--ink); }

.drawer-body { flex: 1; overflow-y: auto; padding: 16px 24px; }

.line {
  display: flex; gap: 14px; padding: 16px 0;
  border-bottom: 1px solid var(--ink-08);
}
.line:last-child { border-bottom: none; }
.line-thumb {
  width: 50px; height: 50px; flex: none; border-radius: 11px;
  background: var(--mint-100); color: var(--mint-700);
  display: grid; place-items: center; font-weight: 700; font-size: .82rem;
  font-family: var(--serif);
}
.line-main { flex: 1; min-width: 0; }
.line-name { font-weight: 600; font-size: .94rem; margin-bottom: 2px; }
.line-meta { font-size: .76rem; color: var(--ink-40); font-family: var(--mono); }
.line-row { display: flex; align-items: center; justify-content: space-between; margin-top: 10px; }
.qty {
  display: inline-flex; align-items: center; gap: 2px;
  border: 1px solid var(--ink-12); border-radius: 999px; background: #fff;
}
.qty button {
  width: 28px; height: 28px; border: none; background: none; cursor: pointer;
  font-size: 1rem; color: var(--ink-60); border-radius: 999px; line-height: 1;
}
.qty button:hover { background: var(--ink-08); color: var(--ink); }
.qty span { min-width: 24px; text-align: center; font-size: .86rem; font-weight: 600; }
.line-price { font-weight: 700; font-size: .96rem; }
.line-remove {
  background: none; border: none; cursor: pointer; color: var(--ink-40);
  font-size: .74rem; padding: 0; margin-top: 6px; text-decoration: underline;
}
.line-remove:hover { color: #c0392b; }

.drawer-foot {
  border-top: 1px solid var(--ink-08); padding: 20px 24px 24px;
  background: var(--cream-2);
}
.sum { display: flex; justify-content: space-between; font-size: .9rem; margin-bottom: 9px; color: var(--ink-60); }
.sum b { color: var(--ink); font-weight: 600; }
.sum.total {
  font-size: 1.22rem; margin: 14px 0 4px; padding-top: 14px;
  border-top: 1px solid var(--ink-12); color: var(--ink); font-weight: 700;
}
.sum.per-vial-summary {
  background: var(--mint-100); border-radius: 10px;
  padding: 9px 13px; margin: 10px 0 12px; font-size: .84rem;
  color: var(--mint-700);
}
.sum.per-vial-summary b { color: var(--mint-700); font-weight: 700; }
.fee-note { font-size: .72rem; color: var(--ink-40); margin: 0 0 16px; }

.cart-empty { text-align: center; padding: 70px 24px; color: var(--ink-40); }
.cart-empty svg { margin: 0 auto 16px; opacity: .35; }

/* ---------- Table (FAQ / terms body) ---------- */
.prose { max-width: 72ch; }
.prose h2 { margin-top: 48px; font-size: 1.55rem; }
.prose h3 { margin-top: 30px; }
.prose p, .prose li { color: var(--ink-60); }
.prose li { margin-bottom: 8px; }
.prose strong { color: var(--ink); }

.faq-item {
  border-bottom: 1px solid var(--ink-08); padding: 4px 0;
}
.faq-q {
  width: 100%; text-align: left; background: none; border: none; cursor: pointer;
  font-family: inherit; font-size: 1.02rem; font-weight: 600; color: var(--ink);
  padding: 20px 40px 20px 0; position: relative;
}
.faq-q::after {
  content: '+'; position: absolute; right: 6px; top: 50%; transform: translateY(-50%);
  font-size: 1.4rem; font-weight: 400; color: var(--mint-600); transition: transform .2s;
}
.faq-item.open .faq-q::after { transform: translateY(-50%) rotate(45deg); }
.faq-a { display: none; padding: 0 40px 22px 0; color: var(--ink-60); font-size: .95rem; }
.faq-item.open .faq-a { display: block; }

/* ---------- Banner / disclaimer ---------- */
.ruo-banner {
  background: var(--ink); color: var(--cream);
  border-radius: var(--radius-lg); padding: 36px 40px;
  display: flex; gap: 26px; align-items: flex-start;
}
.ruo-banner svg { flex: none; color: var(--mint); margin-top: 3px; }
.ruo-banner h3 { color: var(--cream); margin-bottom: 8px; }
.ruo-banner p { color: rgba(251,248,241,.66); font-size: .92rem; margin: 0; }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--ink); color: var(--cream);
  padding: 62px 0 30px; margin-top: 0;
}
.footer-grid {
  display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 40px;
  padding-bottom: 44px; border-bottom: 1px solid rgba(251,248,241,.1);
}
.site-footer .logo-name { color: var(--cream); }
.site-footer .logo-sub { color: rgba(251,248,241,.4); }
.footer-about { color: rgba(251,248,241,.55); font-size: .88rem; margin-top: 18px; max-width: 34ch; }
.footer-col h4 {
  font-size: .7rem; letter-spacing: .15em; text-transform: uppercase;
  color: var(--mint); margin-bottom: 16px; font-weight: 700;
}
.footer-col a, .footer-col li {
  display: block; color: rgba(251,248,241,.6); font-size: .88rem;
  margin-bottom: 10px; transition: color .16s;
}
.footer-col a:hover { color: var(--mint); }
.footer-col ul { list-style: none; padding: 0; margin: 0; }
.footer-bottom {
  padding-top: 22px; display: flex; justify-content: space-between;
  gap: 16px; flex-wrap: wrap; font-size: .78rem; color: rgba(251,248,241,.4);
}
.footer-legal {
  margin-top: 26px; font-size: .74rem; line-height: 1.6;
  color: rgba(251,248,241,.38); max-width: 90ch;
}

/* ---------- Age gate ---------- */
.agegate {
  position: fixed; inset: 0; z-index: 1000;
  background: var(--ink);
  display: grid; place-items: center; padding: 24px;
  overflow-y: auto;
}
.agegate::before {
  content: ''; position: absolute; inset: 0;
  background:
    radial-gradient(760px 460px at 82% 6%, rgba(125,220,180,.16) 0%, transparent 62%),
    radial-gradient(620px 400px at 6% 96%, rgba(125,220,180,.09) 0%, transparent 60%);
  pointer-events: none;
}
.agegate-card {
  position: relative; width: 100%; max-width: 520px;
  background: var(--cream); border-radius: var(--radius-lg);
  padding: 42px 40px 34px; text-align: center;
  box-shadow: 0 40px 100px rgba(0,0,0,.5);
  animation: gateIn .34s cubic-bezier(.2,.8,.3,1);
}
@keyframes gateIn {
  from { opacity: 0; transform: translateY(14px) scale(.985); }
  to   { opacity: 1; transform: none; }
}
.agegate-card .logo { justify-content: center; margin-bottom: 26px; }
.agegate-card .logo svg { width: 46px; height: 46px; }
.agegate-card .logo-name { font-size: 1.6rem; }
.agegate h2 {
  font-family: var(--serif); font-weight: 400;
  font-size: 1.85rem; margin-bottom: 12px; letter-spacing: -.015em;
}
.agegate p { font-size: .93rem; color: var(--ink-60); margin: 0 0 10px; }
.agegate .gate-cert {
  text-align: left; background: #fff; border: 1px solid var(--ink-08);
  border-radius: var(--radius); padding: 16px 18px; margin: 22px 0 24px;
}
.agegate .gate-cert li {
  font-size: .82rem; color: var(--ink-60); line-height: 1.5;
  margin-bottom: 9px; padding-left: 24px; position: relative; list-style: none;
}
.agegate .gate-cert li:last-child { margin-bottom: 0; }
.agegate .gate-cert li::before {
  content: ''; position: absolute; left: 6px; top: .55em;
  width: 6px; height: 6px; border-radius: 50%; background: var(--mint-600);
}
.agegate .gate-cert strong { color: var(--ink); }
.agegate-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.agegate-fine {
  font-size: .72rem; color: var(--ink-40); margin: 20px 0 0; line-height: 1.5;
}
.agegate-fine a { text-decoration: underline; }

.agegate.denied .agegate-card { text-align: center; }
.gate-deny-icon {
  width: 62px; height: 62px; border-radius: 50%; margin: 0 auto 20px;
  background: rgba(192,57,43,.09); color: #c0392b; display: grid; place-items: center;
}

@media (max-width: 560px) {
  .agegate-card { padding: 32px 24px 26px; }
  .agegate h2 { font-size: 1.5rem; }
  .agegate-actions { grid-template-columns: 1fr; }
}

/* ---------- Toast ---------- */
.toast {
  position: fixed; bottom: 26px; left: 50%; transform: translateX(-50%) translateY(120%);
  background: var(--ink); color: var(--cream);
  padding: 13px 22px; border-radius: 999px; font-size: .88rem; font-weight: 500;
  z-index: 120; transition: transform .3s cubic-bezier(.4,0,.2,1); box-shadow: var(--shadow-md);
  display: flex; align-items: center; gap: 9px;
}
.toast.show { transform: translateX(-50%) translateY(0); }
.toast svg { color: var(--mint); }

/* ---------- Responsive ---------- */
@media (max-width: 940px) {
  .hero-grid { grid-template-columns: 1fr; gap: 34px; }
  .hero-mark { max-width: 320px; margin: 0 auto; }
  .cards { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .trust-grid { grid-template-columns: 1fr 1fr; }
  .trust-item:nth-child(2) { border-right: none; }
  .trust-item:nth-child(1), .trust-item:nth-child(2) { border-bottom: 1px solid var(--ink-08); }
}
@media (max-width: 720px) {
  .nav {
    position: absolute; top: 74px; left: 0; right: 0;
    background: var(--cream); flex-direction: column; align-items: stretch;
    gap: 0; padding: 8px 24px 20px; border-bottom: 1px solid var(--ink-08);
    display: none; box-shadow: var(--shadow-md);
  }
  .nav.open { display: flex; }
  .nav a { padding: 13px 0; border-bottom: 1px solid var(--ink-08); }
  .nav a.active::after { display: none; }
  .menu-toggle { display: grid; }
  .site-header { position: relative; }
  .section { padding: 58px 0; }
  .hero { padding: 56px 0 48px; }
  .ruo-banner { flex-direction: column; padding: 28px 24px; gap: 16px; }
  .logo-sub { display: none; }
}