/* ==========================================================================
   Axio Research Peptides — design system
   Clean scientific aesthetic: white/neutral backgrounds, navy/charcoal type,
   spacious layout, mobile-first, WCAG 2.2 AA contrast targets.
   ========================================================================== */

:root {
  --navy:        #0f2740;
  --navy-700:    #0b1d30;
  --charcoal:    #1f2933;
  --ink:         #16202b;   /* body text on white  ~ 14:1 */
  --muted:       #52627a;   /* secondary text on white ~ 5.4:1 */
  --bg:          #ffffff;
  --bg-soft:     #f5f7fa;
  --bg-panel:    #eef2f7;
  --border:      #d8e0ea;
  --border-strong:#b7c4d4;
  --accent:      #12557e;   /* links / primary  ~ 7:1 on white */
  --accent-700:  #0d3f5f;
  --accent-50:   #eaf2f8;
  --ok:          #1a7f5a;
  --ok-bg:       #e7f5ee;
  --warn:        #8a5a00;
  --warn-bg:     #fdf4e3;
  --stop:        #9a2530;
  --stop-bg:     #fbeced;
  --radius:      10px;
  --radius-sm:   6px;
  --shadow:      0 1px 2px rgba(16,32,48,.06), 0 6px 20px rgba(16,32,48,.06);
  --maxw:        1160px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial,
          "Apple Color Emoji", sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  font-size: 17px;
}
h1,h2,h3,h4 { color: var(--navy); line-height: 1.2; margin: 0 0 .5em; font-weight: 700; letter-spacing: -.01em; }
h1 { font-size: clamp(1.9rem, 1.2rem + 2.6vw, 3rem); }
h2 { font-size: clamp(1.5rem, 1.1rem + 1.4vw, 2.1rem); }
h3 { font-size: 1.25rem; }
p { margin: 0 0 1rem; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
img { max-width: 100%; display: block; }
hr { border: 0; border-top: 1px solid var(--border); margin: 2rem 0; }
code, kbd { font-family: var(--mono); font-size: .92em; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }
.section { padding: 56px 0; }
.section--soft { background: var(--bg-soft); }
.muted { color: var(--muted); }
.small { font-size: .875rem; }
.center { text-align: center; }
.stack > * + * { margin-top: 1rem; }
.lead { font-size: 1.15rem; color: var(--charcoal); }
.eyebrow { text-transform: uppercase; letter-spacing: .09em; font-size: .78rem; font-weight: 700;
           color: var(--accent); margin-bottom: .5rem; }
.visually-hidden { position:absolute; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden;
                   clip:rect(0 0 0 0); white-space:nowrap; border:0; }

/* --- Skip link ----------------------------------------------------------- */
.skip-link { position:absolute; left:-999px; top:0; background:var(--navy); color:#fff;
             padding:10px 16px; z-index:200; border-radius:0 0 6px 0; }
.skip-link:focus { left:0; }

/* --- Buttons ------------------------------------------------------------- */
.btn { display:inline-flex; align-items:center; gap:.5rem; justify-content:center;
       font: inherit; font-weight:600; padding:.7rem 1.15rem; border-radius:var(--radius-sm);
       border:1px solid transparent; cursor:pointer; text-decoration:none; line-height:1.2;
       transition: background .12s, border-color .12s, color .12s; }
.btn:hover { text-decoration:none; }
.btn--primary { background:var(--accent); color:#fff; }
.btn--primary:hover { background:var(--accent-700); }
.btn--secondary { background:#fff; color:var(--accent); border-color:var(--border-strong); }
.btn--secondary:hover { background:var(--accent-50); }
.btn--ghost { background:transparent; color:var(--navy); border-color:transparent; }
.btn--sm { padding:.45rem .8rem; font-size:.9rem; }
.btn--block { width:100%; }
.btn:disabled { opacity:.5; cursor:not-allowed; }

/* --- Top compliance banner ---------------------------------------------- */
.ruo-banner { background:var(--navy); color:#eaf1f8; font-size:.82rem; text-align:center;
              padding:.5rem 16px; letter-spacing:.02em; }
.ruo-banner strong { color:#fff; }

/* --- Header / nav -------------------------------------------------------- */
.site-header { position:sticky; top:0; z-index:100; background:rgba(255,255,255,.92);
               backdrop-filter:saturate(180%) blur(8px); border-bottom:1px solid var(--border); }
.nav { display:flex; align-items:center; gap:1rem; height:66px; }
.brand { display:flex; align-items:center; gap:.6rem; font-weight:800; color:var(--navy);
         font-size:1.12rem; letter-spacing:-.02em; }
.brand:hover { text-decoration:none; }
.brand .mark { width:30px; height:30px; }
.nav-links { display:flex; gap:.25rem; margin-left:auto; align-items:center; }
.nav-links a { color:var(--charcoal); font-weight:500; padding:.5rem .7rem; border-radius:6px; font-size:.96rem; }
.nav-links a:hover { background:var(--bg-panel); text-decoration:none; }
.nav-links a.active { color:var(--accent); }
.nav-cta { display:flex; gap:.5rem; align-items:center; margin-left:.5rem; }
.cart-link { position:relative; }
.cart-count { position:absolute; top:-6px; right:-8px; background:var(--accent); color:#fff;
              font-size:.68rem; font-weight:700; min-width:18px; height:18px; padding:0 4px;
              border-radius:9px; display:grid; place-items:center; }
.nav-toggle { display:none; margin-left:auto; background:none; border:1px solid var(--border-strong);
              border-radius:6px; padding:.4rem .55rem; cursor:pointer; }
.nav-toggle svg { display:block; }

@media (max-width: 900px) {
  .nav-links, .nav-cta { display:none; }
  .nav-toggle { display:inline-flex; }
  .nav-mobile { display:block; border-top:1px solid var(--border); background:#fff; padding:.5rem 0 1rem; }
  .nav-mobile a { display:block; padding:.7rem 20px; color:var(--charcoal); font-weight:500; }
  .nav-mobile a:hover { background:var(--bg-panel); text-decoration:none; }
  .nav-mobile .btn { margin:.5rem 20px 0; width:calc(100% - 40px); }
}

/* --- Hero ---------------------------------------------------------------- */
.hero { background:
   radial-gradient(1100px 460px at 82% -12%, #e9f0f7 0%, rgba(233,240,247,0) 60%),
   linear-gradient(180deg,#fff 0%, var(--bg-soft) 100%);
   border-bottom:1px solid var(--border); }
.hero-grid { display:grid; grid-template-columns: 1.15fr .85fr; gap:2.5rem; align-items:center;
             padding:64px 0; }
.hero h1 { margin-bottom:.4em; }
.hero .btns { display:flex; gap:.75rem; flex-wrap:wrap; margin-top:1.5rem; }
.hero-card { background:#fff; border:1px solid var(--border); border-radius:var(--radius);
             box-shadow:var(--shadow); padding:1.4rem; }
.hero-vials { display:grid; grid-template-columns:repeat(3,1fr); gap:1rem; }
@media (max-width: 820px){ .hero-grid { grid-template-columns:1fr; padding:40px 0; } }

/* --- Notices / disclaimers ---------------------------------------------- */
.notice { border:1px solid var(--border-strong); border-left-width:5px; border-radius:var(--radius-sm);
          padding:1rem 1.1rem; background:var(--bg-soft); }
.notice h3, .notice h4 { margin-top:0; }
.notice--ruo { border-left-color:var(--stop); background:var(--stop-bg); }
.notice--ruo .notice-title { color:var(--stop); font-weight:800; letter-spacing:.02em; }
.notice--warn { border-left-color:var(--warn); background:var(--warn-bg); }
.notice--info { border-left-color:var(--accent); background:var(--accent-50); }
.notice--legal { border-left-color:var(--muted); background:var(--bg-panel); font-size:.9rem; }
.ruo-inline { display:inline-block; font-weight:800; color:var(--stop); font-size:.8rem;
              letter-spacing:.03em; text-transform:uppercase; }

/* --- Cards / grids ------------------------------------------------------- */
.grid { display:grid; gap:1.25rem; }
.grid--3 { grid-template-columns:repeat(3,1fr); }
.grid--4 { grid-template-columns:repeat(4,1fr); }
.grid--2 { grid-template-columns:repeat(2,1fr); }
@media (max-width: 900px){ .grid--3,.grid--4 { grid-template-columns:repeat(2,1fr); } }
@media (max-width: 620px){ .grid--2,.grid--3,.grid--4 { grid-template-columns:1fr; } }

.card { background:#fff; border:1px solid var(--border); border-radius:var(--radius); padding:1.25rem;
        box-shadow:var(--shadow); }
.card--link { display:block; color:inherit; transition:border-color .12s, transform .12s; }
.card--link:hover { border-color:var(--border-strong); text-decoration:none; transform:translateY(-2px); }
.card .icon { color:var(--accent); margin-bottom:.6rem; }
.feature-cat { display:flex; flex-direction:column; gap:.35rem; }

/* --- Product card / catalog --------------------------------------------- */
.product-card { display:flex; flex-direction:column; height:100%; }
.product-card .vial { align-self:flex-start; margin-bottom:.5rem; }
.product-card .sku { font-family:var(--mono); font-size:.8rem; color:var(--muted); }
.product-card h3 { font-size:1.06rem; margin:.2rem 0 .35rem; }
.product-card .spec { font-size:.85rem; color:var(--muted); margin-bottom:.75rem; }
.product-card .foot { margin-top:auto; display:flex; align-items:center; justify-content:space-between; gap:.5rem; }
.price { font-weight:700; color:var(--navy); }

.badge { display:inline-flex; align-items:center; gap:.35rem; font-size:.75rem; font-weight:700;
         padding:.2rem .55rem; border-radius:100px; border:1px solid transparent; white-space:nowrap; }
.badge--in_stock { background:var(--ok-bg); color:var(--ok); }
.badge--backordered { background:var(--warn-bg); color:var(--warn); }
.badge--discontinued { background:var(--bg-panel); color:var(--muted); }
.badge .dot { width:7px; height:7px; border-radius:50%; background:currentColor; }

/* --- Catalog toolbar ----------------------------------------------------- */
.toolbar { display:grid; grid-template-columns: 260px 1fr; gap:1.5rem; align-items:start; }
@media (max-width: 820px){ .toolbar { grid-template-columns:1fr; } }
.filters { position:sticky; top:82px; background:#fff; border:1px solid var(--border);
           border-radius:var(--radius); padding:1.1rem; }
.filters h4 { font-size:.82rem; text-transform:uppercase; letter-spacing:.06em; color:var(--muted);
              margin:1rem 0 .5rem; }
.filters h4:first-child { margin-top:0; }
.filter-row { display:flex; align-items:center; gap:.5rem; padding:.15rem 0; font-size:.95rem; }
.results-head { display:flex; align-items:center; justify-content:space-between; gap:1rem;
                margin-bottom:1rem; flex-wrap:wrap; }

/* --- Forms --------------------------------------------------------------- */
label { font-weight:600; color:var(--charcoal); display:block; margin-bottom:.3rem; font-size:.95rem; }
input[type=text], input[type=email], input[type=search], input[type=tel], input[type=number],
select, textarea {
  width:100%; font:inherit; padding:.6rem .7rem; border:1px solid var(--border-strong);
  border-radius:var(--radius-sm); background:#fff; color:var(--ink); }
textarea { min-height:120px; resize:vertical; }
input:focus, select:focus, textarea:focus { border-color:var(--accent); outline:none;
  box-shadow:0 0 0 3px var(--accent-50); }
.field { margin-bottom:1rem; }
.field .hint { font-weight:400; color:var(--muted); font-size:.85rem; margin-top:.25rem; }
.checkbox { display:flex; gap:.6rem; align-items:flex-start; font-weight:500; color:var(--ink);
            margin-bottom:.65rem; cursor:pointer; }
.checkbox input { margin-top:.25rem; width:18px; height:18px; flex:none; accent-color:var(--accent); }
.searchbar { display:flex; gap:.5rem; }
.searchbar input { flex:1; }

/* --- Spec table ---------------------------------------------------------- */
.spec-table { width:100%; border-collapse:collapse; font-size:.95rem; }
.spec-table th, .spec-table td { text-align:left; padding:.6rem .5rem; border-bottom:1px solid var(--border);
                                 vertical-align:top; }
.spec-table th { width:42%; color:var(--muted); font-weight:600; }
.spec-table td { font-family:var(--mono); font-size:.9rem; color:var(--ink); }
.data-table { width:100%; border-collapse:collapse; font-size:.92rem; }
.data-table th { text-align:left; background:var(--bg-panel); color:var(--charcoal); padding:.6rem .7rem;
                 border-bottom:1px solid var(--border); }
.data-table td { padding:.55rem .7rem; border-bottom:1px solid var(--border); }
.data-table tr:hover td { background:var(--bg-soft); }

/* --- Product detail layout ---------------------------------------------- */
.pdp { display:grid; grid-template-columns: 1fr 1fr; gap:2.5rem; }
@media (max-width: 860px){ .pdp { grid-template-columns:1fr; gap:1.5rem; } }
.pdp-media { background:var(--bg-soft); border:1px solid var(--border); border-radius:var(--radius);
             display:grid; place-items:center; padding:2.5rem; min-height:280px; }
.buybox { border:1px solid var(--border); border-radius:var(--radius); padding:1.25rem; box-shadow:var(--shadow); }
.breadcrumbs { font-size:.85rem; color:var(--muted); margin:1.25rem 0 .5rem; }
.breadcrumbs a { color:var(--muted); }
.tag { display:inline-block; font-size:.75rem; background:var(--bg-panel); color:var(--charcoal);
       padding:.2rem .55rem; border-radius:100px; }

/* --- Footer -------------------------------------------------------------- */
.site-footer { background:var(--navy); color:#c6d4e3; margin-top:64px; }
.site-footer a { color:#dbe6f1; }
.footer-grid { display:grid; grid-template-columns:1.4fr 1fr 1fr 1fr; gap:2rem; padding:52px 0 32px; }
@media (max-width:820px){ .footer-grid { grid-template-columns:1fr 1fr; } }
@media (max-width:520px){ .footer-grid { grid-template-columns:1fr; } }
.site-footer h5 { color:#fff; font-size:.8rem; text-transform:uppercase; letter-spacing:.08em; margin:0 0 .8rem; }
.site-footer ul { list-style:none; margin:0; padding:0; }
.site-footer li { margin:.4rem 0; }
.footer-bottom { border-top:1px solid rgba(255,255,255,.14); padding:20px 0; font-size:.82rem; color:#9fb2c6; }
.footer-compliance { background:var(--navy-700); color:#b9c8d9; font-size:.83rem; padding:1.1rem 0; border-top:1px solid rgba(255,255,255,.08); }

/* --- Accordion (FAQ) ----------------------------------------------------- */
details.acc { border:1px solid var(--border); border-radius:var(--radius-sm); padding:.25rem 1rem;
              margin-bottom:.6rem; background:#fff; }
details.acc summary { cursor:pointer; font-weight:600; color:var(--navy); padding:.75rem 0; list-style:none; }
details.acc summary::-webkit-details-marker { display:none; }
details.acc summary::after { content:"+"; float:right; color:var(--accent); font-weight:700; }
details.acc[open] summary::after { content:"\2212"; }

/* --- Toast --------------------------------------------------------------- */
.toast-wrap { position:fixed; bottom:20px; left:50%; transform:translateX(-50%); z-index:300;
              display:flex; flex-direction:column; gap:.5rem; }
.toast { background:var(--navy); color:#fff; padding:.7rem 1.1rem; border-radius:8px; box-shadow:var(--shadow);
         font-size:.92rem; }

/* --- Misc ---------------------------------------------------------------- */
.kpis { display:grid; grid-template-columns:repeat(3,1fr); gap:1rem; }
@media (max-width:620px){ .kpis { grid-template-columns:1fr; } }
.kpi { border:1px solid var(--border); border-radius:var(--radius); padding:1.1rem; background:#fff; }
.kpi .n { font-size:1.7rem; font-weight:800; color:var(--navy); }
.steps { counter-reset:step; display:grid; gap:1rem; }
.step { display:flex; gap:1rem; }
.step .num { counter-increment:step; background:var(--accent); color:#fff; width:32px; height:32px;
             border-radius:50%; display:grid; place-items:center; font-weight:700; flex:none; }
.step .num::before { content:counter(step); }
.prose { max-width:760px; }
.prose h2 { margin-top:2rem; }
.prose ul { padding-left:1.2rem; }
.prose li { margin:.35rem 0; }
.legal-toc a { display:block; padding:.35rem 0; }
.empty { text-align:center; padding:3rem 1rem; color:var(--muted); }