/* shop.mathphysics.academy — follows business/SITE-LOOK.md and BRAND.md */
:root {
  --ruby: #7D1922; --ink: #14171C; --slate: #3A414B; --grey: #8B929C;
  --cream: #F2EBDD; --line: #d9d9d9;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: #fff; color: var(--ink);
  font: 17px/1.55 Roboto, "Helvetica Neue", Arial, sans-serif;
}
a { color: var(--ruby); }
h1, h2, h3 { font-weight: 700; line-height: 1.15; margin: 0 0 .5rem; }
.wrap { max-width: 1100px; margin: 0 auto; padding: 0 20px; }

/* header */
.top { display: flex; align-items: center; justify-content: space-between; gap: 1.5rem;
       padding-top: 1.4rem; padding-bottom: 1.4rem; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 1.2rem; text-decoration: none; color: inherit; }
.brand img { height: 56px; width: auto; }
.brand .word { color: var(--ruby); font-weight: 700; letter-spacing: .12em; font-size: 1.15rem; }
.brand .shop { color: var(--slate); font-weight: 700; font-size: 1.3rem; letter-spacing: .06em; }
.nav { display: flex; gap: 1.4rem; font-weight: 700; font-size: .95rem; }
.nav a { color: var(--ink); text-decoration: none; padding-bottom: .3rem; border-bottom: 3px solid transparent; }
.nav a.here { color: var(--ruby); border-color: var(--ruby); }

/* black band */
.band { background: #000; color: #fff; text-align: center; padding: 3.2rem 20px; }
.band h2 { font-size: 2.2rem; }
.band p { margin: 0; color: #ddd; }

/* product */
.product { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: start;
           padding: 3.5rem 0; }
.gallery img { width: 100%; height: auto; display: block; background: var(--ink); }
.thumbs { display: flex; gap: .6rem; margin-top: .6rem; }
.thumb { width: 72px; padding: 0; margin: 0; border: 2px solid transparent; border-radius: 4px;
         background: none; cursor: pointer; line-height: 0; }
.thumb.on { border-color: var(--ruby); }
.product h1 { font-size: 2.1rem; color: var(--ruby); }
.price { font-size: 1.5rem; font-weight: 700; margin: .2rem 0 1.2rem; }
.product ul { padding-left: 1.2rem; margin: 1rem 0; }
.product li { margin: .25rem 0; }
.note { color: var(--slate); font-size: .9rem; }
.eyebrow { text-transform: uppercase; letter-spacing: .14em; font-weight: 700;
           color: var(--slate); font-size: .85rem; margin: 0 0 .4rem; }

/* order form */
fieldset { border: 0; padding: 0; margin: 1.2rem 0; }
legend { padding: 0; font-weight: 700; margin-bottom: .5rem; }
.sizes { display: grid; grid-template-columns: repeat(4, 1fr); gap: .6rem; }
.sizes label { display: flex; flex-direction: column; align-items: center; gap: .3rem;
               border: 1px solid var(--line); padding: .6rem .4rem; font-weight: 700; }
.sizes input { width: 3.2rem; text-align: center; }
label { display: block; margin: .6rem 0 .2rem; }
input, select { width: 100%; padding: .55rem; font: inherit; border: 1px solid var(--grey); border-radius: 4px; }
.row { display: flex; gap: .5rem; } .row > * { flex: 1; }
.ack { display: flex; gap: .6rem; align-items: flex-start; margin: 1rem 0; font-size: .92rem; }
.ack input, .ship input { width: auto; margin-top: .25rem; }
button { background: var(--ruby); color: #fff; border: 0; border-radius: 999px;
         padding: .85rem 1.8rem; font: inherit; font-weight: 700; cursor: pointer; margin-top: .6rem; }
button[disabled] { opacity: .5; cursor: default; }
#error { color: #b3261e; font-weight: 700; min-height: 1.4em; }
#busy { border: 1px solid var(--grey); padding: .6rem .8rem; margin: 1rem 0; }
#step2 { display: none; }
.ship label { display: flex; gap: .5rem; align-items: baseline; margin: .3rem 0; }
#summary { width: 100%; border-collapse: collapse; margin: 1rem 0; }
#summary td { padding: .25rem 0; }
#summary td:last-child { text-align: right; font-variant-numeric: tabular-nums; }
#summary tr.total td { border-top: 1px solid var(--ink); font-weight: 700; padding-top: .5rem; }
.divider { display: flex; align-items: center; gap: .75rem; color: var(--slate);
           font-size: .85rem; margin: 1.2rem 0; }
.divider::before, .divider::after { content: ""; flex: 1; border-top: 1px solid var(--line); }

/* policy pages */
.policy { max-width: 720px; padding-top: 2.5rem; padding-bottom: 3rem; }
.policy h1 { color: var(--ruby); font-size: 2rem; }
.policy h2 { font-size: 1.2rem; margin-top: 1.8rem; }
.policy table { border-collapse: collapse; width: 100%; font-size: .92rem; margin: 1rem 0; }
.policy th, .policy td { text-align: left; vertical-align: top; padding: .4rem .5rem .4rem 0; border-bottom: 1px solid var(--line); }

/* legal + footer */
.legal { border-top: 1px solid var(--line); padding: 2rem 0; font-size: .9rem; color: var(--slate); }
.legal p { margin: .3rem 0; }
footer { background: #000; color: #fff; }
footer .tag { text-align: center; padding: 2.4rem 20px; margin: 0; }
footer .bar { background: #0b0b0b; padding: 2rem 0 2.6rem; }
footer .bar .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 1rem; }
footer a { color: #fff; text-decoration: none; }
footer .social { display: flex; justify-content: center; gap: 1.6rem; margin-top: 1.6rem; width: 100%; }
footer .social a { color: var(--ruby); display: inline-flex; }

@media (max-width: 760px) {
  .product { grid-template-columns: 1fr; gap: 1.6rem; padding: 2rem 0; }
  .top { flex-direction: column; align-items: stretch; gap: 1rem; padding-top: 1.1rem; padding-bottom: .9rem; }
  .brand { gap: .8rem; }
  .brand img { height: 44px; }
  .brand .word { font-size: .95rem; letter-spacing: .08em; }
  .brand .shop { font-size: 1.1rem; }
  .nav { width: 100%; justify-content: space-between; gap: .5rem; font-size: .9rem; }
}