/* Carat & Co.: ink navy, ice blue and champagne on cool white.
   Change the colours and fonts here; base.css reads these variables. */
:root {
  --bg: #F5F6F8;
  --surface: #FFFFFF;
  --soft: #EAF1F6;
  --ink: #0D1B2A;
  --muted: #5A6675;
  --line: #DDE2E8;
  --line-strong: #C3CBD5;
  --ice: #DCEBF5;
  --champagne: #B8916A;
  --brand: #0D1B2A;
  --brand-hover: #1D3047;
  --brand-ink: #FFFFFF;
  --brand-text: #0D1B2A;
  --eyebrow: #8A6643;
  --head: "Instrument Serif", Georgia, serif;
  --body: "Inter Tight", system-ui, sans-serif;
  --radius: 999px;
  --radius-lg: 20px;
  --btn-radius: 999px;
  --wrap: 1200px;
  --gap: 18px;
  --art-bg: radial-gradient(circle at 50% 35%, #FFFFFF 0, #EAF1F6 75%);
  --bar-bg: #0D1B2A;
  --bar-ink: #F5F6F8;
  --wish: #B8456A;
}
h1, h2, h3 { font-weight: 400; letter-spacing: -.01em; }
h1 em, h2 em, .f-statement em { font-style: italic; color: var(--champagne); }
.eyebrow { letter-spacing: .18em; }
.btn { font-weight: 600; }
.btn svg { width: 18px; height: 18px; }
.text-link { color: var(--ink); font-weight: 600; text-underline-offset: 5px; }
.input { border-radius: 12px; }
.pc-body h3 { font-family: var(--body); font-weight: 600; }

/* ---------- header ---------- */
.header { background: rgba(245,246,248,.9); backdrop-filter: blur(12px); border-bottom: 1px solid var(--line); }
.logo { display: flex; align-items: baseline; gap: 4px; text-decoration: none; font: 400 1.9rem var(--head); white-space: nowrap; }
.logo b { font-weight: 400; }
.logo i { color: var(--champagne); }
.nav a { color: var(--muted); font-weight: 500; border-radius: 999px; }
.nav a:hover { color: var(--ink); background: var(--soft); }
.nav a[aria-current="page"] { color: var(--ink); background: var(--ice); }

/* ---------- hero ---------- */
.hero { padding-block: clamp(32px, 5vw, 72px); background: radial-gradient(circle at 75% 45%, #FFFFFF 0, var(--ice) 30%, transparent 60%), var(--bg); overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr); gap: clamp(28px, 5vw, 64px); align-items: center; }
@media (max-width: 900px) { .hero-grid { grid-template-columns: minmax(0, 1fr); } .hero-ring { max-width: 420px; } }
.hero h1 { font-size: clamp(3rem, 7vw, 6.2rem); line-height: .95; margin: 16px 0 22px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.hero-facts { display: flex; flex-wrap: wrap; gap: 14px 32px; margin: 32px 0 0; }
.hero-facts dt { font-size: .78rem; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); }
.hero-facts dd { margin: 2px 0 0; font: 400 1.4rem var(--head); }
.ring-art { display: block; width: 100%; height: auto; }
.hero-ring { position: relative; }
.hero-tag { position: absolute; left: 50%; bottom: 0; transform: translateX(-50%); padding: 6px 14px; border-radius: 999px; background: var(--surface); border: 1px solid var(--line); font-size: .86rem; font-weight: 600; white-space: nowrap; }

/* ---------- sections ---------- */
.sec-head { display: flex; justify-content: space-between; align-items: end; gap: 12px 32px; flex-wrap: wrap; margin-bottom: 26px; }
.sec-head h2, .sec-title { font-size: clamp(2.2rem, 4.6vw, 3.6rem); }
.shape-row { list-style: none; display: grid; grid-template-columns: repeat(6, 1fr); gap: 12px; }
@media (max-width: 900px) { .shape-row { grid-template-columns: repeat(3, 1fr); } }
.shape-row a { display: grid; gap: 4px; justify-items: center; padding: 10px 10px 16px; border-radius: var(--radius-lg); background: var(--surface); border: 1px solid var(--line); text-decoration: none; font-weight: 600; transition: border-color .2s, transform .2s; }
.shape-row a:hover { border-color: var(--ink); transform: translateY(-3px); }
.compare-band { background: var(--ink); color: #C9D3DE; }
.compare-band .sec-title { color: #fff; margin-bottom: 24px; }
.compare { width: 100%; border-collapse: collapse; font-size: 1rem; }
.compare th, .compare td { padding: 16px 14px; text-align: left; border-bottom: 1px solid rgba(255,255,255,.12); font-weight: 400; }
.compare thead th { font: 400 1.4rem var(--head); color: #fff; }
.compare tbody th { color: #8FA0B3; }
.compare td:nth-child(2) { color: #fff; font-weight: 600; }

/* ---------- ring builder (signature) ---------- */
.rb { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); grid-template-areas: "stage controls" "sum controls"; gap: clamp(18px, 3vw, 32px); align-items: start; }
@media (max-width: 900px) { .rb { grid-template-columns: minmax(0, 1fr); grid-template-areas: "stage" "controls" "sum"; } }
.rb-stage-wrap { grid-area: stage; display: grid; gap: 10px; }
.rb-stage { padding: 20px; border-radius: var(--radius-lg); background: radial-gradient(circle at 50% 40%, #FFFFFF 0, var(--ice) 80%); border: 1px solid var(--line); }
.rb-spec { text-align: center; color: var(--muted); font-weight: 500; }
.rb-controls { grid-area: controls; display: grid; gap: 20px; padding: clamp(18px, 2.6vw, 26px); border-radius: var(--radius-lg); background: var(--surface); border: 1px solid var(--line); }
.rq { border: 0; padding: 0; margin: 0; min-width: 0; display: grid; gap: 8px; }
.rq legend, .rq-label { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; font: 400 1.4rem var(--head); padding: 0; margin-bottom: 4px; }
.rq-label .text-link { font: 600 .86rem var(--body); }
.rq output { font: 600 1rem var(--body); font-variant-numeric: tabular-nums; }
.rq input[type="range"] { width: 100%; height: 30px; accent-color: var(--ink); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chips label { position: relative; cursor: pointer; }
.chips input { position: absolute; opacity: 0; inset: 0; cursor: pointer; }
.chips span { display: inline-grid; place-items: center; min-height: 44px; padding: 8px 16px; border: 1.5px solid var(--line-strong); border-radius: 999px; font-weight: 500; font-size: .92rem; }
.chips input:checked + span { background: var(--ink); border-color: var(--ink); color: #fff; }
.chips input:focus-visible + span { outline: 3px solid var(--champagne); outline-offset: 2px; }
.rb-sum { grid-area: sum; display: grid; gap: 12px; padding: clamp(18px, 2.6vw, 26px); border-radius: var(--radius-lg); background: var(--ink); color: #C9D3DE; }
.rb-total { display: flex; justify-content: space-between; align-items: baseline; }
.rb-total b { font: 400 clamp(2.4rem, 5vw, 3.2rem) var(--head); color: #fff; font-variant-numeric: tabular-nums; }
.rb-sum .breakup th, .rb-sum .breakup td { border-color: rgba(255,255,255,.12); }
.rb-sum .breakup td { color: #fff; }
.rb-mined s { color: #8FA0B3; }
.rb-sum .btn-primary { background: #fff; color: var(--ink); }
.rb-sum .btn-ghost { color: #fff; border-color: rgba(255,255,255,.4); }
.rb-sum .form-note { color: #8FA0B3; }

/* ---------- 4Cs ---------- */
.cs { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--gap); }
@media (max-width: 860px) { .cs { grid-template-columns: minmax(0, 1fr); } }
.c-card { display: grid; gap: 12px; align-content: start; padding: clamp(20px, 3vw, 30px); border-radius: var(--radius-lg); background: var(--surface); border: 1px solid var(--line); }
.c-card h2 { font-size: 2.4rem; }
.c-card p { color: var(--muted); }
.carat-demo { display: grid; grid-template-columns: 140px 1fr; gap: 6px 20px; align-items: center; }
.carat-demo svg { grid-row: 1 / span 3; width: 140px; }
.carat-demo label { font-weight: 600; }
.carat-demo input { width: 100%; accent-color: var(--ink); }
.carat-demo p { color: var(--ink); font-weight: 600; font-variant-numeric: tabular-nums; }
.cut-row, .clarity-row { list-style: none; display: grid; grid-template-columns: repeat(auto-fit, minmax(80px, 1fr)); gap: 10px; text-align: center; font-size: .88rem; font-weight: 600; }
.cut-row svg, .clarity-row svg { width: 100%; max-width: 110px; margin: 0 auto 6px; }
.colour-strip { list-style: none; display: grid; grid-template-columns: repeat(8, 1fr); gap: 4px; text-align: center; font-weight: 600; font-size: .9rem; }
.colour-strip span { display: block; aspect-ratio: 1; border-radius: 50%; margin-bottom: 4px; background: color-mix(in srgb, #FFF4C8 calc(var(--t) * 100%), #F4FAFF); border: 1px solid var(--line-strong); }

/* ---------- ring size ---------- */
.size-out { padding: 16px 18px; border-radius: 14px; background: var(--ice); font: 400 1.5rem var(--head); }

/* ---------- inner pages ---------- */
.page-head h1 { font-size: clamp(2.8rem, 6vw, 4.8rem); }
.cat-filters button[aria-pressed="true"] { background: var(--ink); border-color: var(--ink); }

/* ---------- CTA + footer ---------- */
.cta-band { padding-block: clamp(56px, 8vw, 104px); text-align: center; background: radial-gradient(circle at 50% 100%, var(--ice), var(--bg) 70%); }
.cta-band h2 { font-size: clamp(2.4rem, 5.4vw, 4.4rem); line-height: 1; }
.cta-band p { margin: 14px auto 0; max-width: 52ch; color: var(--muted); }
.cta-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin-top: 26px; }
.footer { background: var(--ink); color: #A9B5C3; --footer-line: rgba(255,255,255,.12); }
.f-statement { font: 400 clamp(2.2rem, 5vw, 3.8rem)/1 var(--head); color: #fff; margin-bottom: 48px; }
.footer .logo { color: #fff; }
.footer h2 { color: var(--champagne); opacity: 1; }
.f-about { margin: 14px 0 10px; max-width: 34ch; }
.footer .credit a { color: #fff; }