:root {
    --bg: #f7f7fb;
    --card: #ffffff;
    --ink: #111827;
    --muted: #6b7280;
    --line: #e5e7eb;
    --accent: #2563eb;
    --accent-2: #7c3aed;
    --accent-soft: #eff6ff;
    --danger: #b91c1c;
    --success: #047857;
    --shadow: 0 18px 50px rgba(15, 23, 42, .08);
   
  }

  * { box-sizing: border-box; }
  body {
    margin: 0;
    background:
      radial-gradient(circle at 12% 0%, rgba(37, 99, 235, .16), transparent 28rem),
      radial-gradient(circle at 95% 8%, rgba(124, 58, 237, .10), transparent 24rem),
      var(--bg);
    color: var(--ink);
  }
  button, input, select { font: inherit; }
  .page { width: min(1240px, calc(100% - 28px)); margin: 0 auto; padding: 28px 0 60px; }
  .hero {
    background: rgba(255,255,255,.9);
    border: 1px solid rgba(229,231,235,.9);
    border-radius: 24px;
    padding: clamp(22px, 4vw, 42px);
    box-shadow: var(--shadow);
    margin-bottom: 12px;
    position: relative;
    overflow: hidden;
    animation: floatIn .55s ease both;
  }
  .hero::after {
    content: "";
    position: absolute;
    width: 220px;
    height: 220px;
    right: -80px;
    top: -90px;
    background: conic-gradient(from 180deg, rgba(37,99,235,.0), rgba(37,99,235,.18), rgba(124,58,237,.13), rgba(37,99,235,.0));
    border-radius: 999px;
    animation: slowSpin 13s linear infinite;
  }
  .eyebrow { margin: 0 0 10px; color: var(--accent); font-size: .78rem; font-weight: 900; letter-spacing: .14em; text-transform: uppercase; }
  h1 { margin: 0 0 10px; font-size: clamp(2rem, 5vw, 4rem); line-height: .98; letter-spacing: -.055em; }
  .hero p:not(.eyebrow) { margin: 0; color: var(--muted); font-size: 1.02rem; max-width: 70ch; line-height: 1.55; }

  .calculator-shell {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(440px, 560px);
    gap: 12px;
    align-items: start;
  }
  .left-flow {
    display: grid;
    gap: 12px;
  }
  
  
  .right-flow { position: sticky; top: 18px; }
  .result-measure-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
    align-items: start;
  }
  #resultPanel { width: 100%; }
  .result-card { width: 100%; }

  .panel {
    background: rgba(255,255,255,.92);
    border: 1px solid rgba(229,231,235,.95);
    border-radius: 24px;
    padding: 20px;
    box-shadow: var(--shadow);
    animation: floatIn .45s ease both;
  }
  .calculator-shell .panel,
.calculator-shell .result-measure-grid {
  padding-top: 20px;
  padding-bottom: 20px;
  margin: 0;
}

.calculator-shell .result-measure-grid {
  padding: 0;
}
  .panel:nth-child(2) { animation-delay: .06s; }
  .panel:nth-child(3) { animation-delay: .1s; }
  .step-header { display: flex; justify-content: space-between; gap: 12px; align-items: start; margin-bottom: 14px; }
  .step-kicker { color: var(--accent); font-weight: 900; text-transform: uppercase; letter-spacing: .12em; font-size: .72rem; margin-bottom: 5px; }
  h2 { margin: 0; font-size: 1.16rem; letter-spacing: -.02em; }
  .helper { margin: 4px 0 0; color: var(--muted); line-height: 1.45; font-size: .9rem; }

  .field-grid { display: grid; gap: 14px; }
  .field { display: grid; gap: 7px; }
  label { font-size: .86rem; font-weight: 800; color: #374151; }
  select, input { width: 100%; border-radius: 14px; border: 1px solid var(--line); background: #fff; color: var(--ink); padding: 12px 13px; transition: border-color .16s ease, box-shadow .16s ease, transform .16s ease; }
  input:focus, select:focus { outline: 0; border-color: rgba(37,99,235,.65); box-shadow: 0 0 0 4px rgba(37,99,235,.12); transform: translateY(-1px); }
  .inline-row { display: grid; grid-template-columns: 1fr 145px; gap: 10px; align-items: end; }
  .check-row { display: flex; align-items: center; gap: 10px; font-size: .88rem; color: #374151; font-weight: 700; }
  .check-row input { width: auto; }

  .shape-panel { overflow: hidden; }
  .shape-toggle { display: none; }
  .shape-drawer-body { display: block; }
  .shape-controls { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 10px; margin-bottom: 14px; }
  .shape-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(138px, 1fr)); gap: 14px; max-height: 760px; overflow: auto; padding: 2px 4px 2px 2px; scroll-behavior: smooth; }
  .shape-card { border: 1px solid var(--line); background: rgba(255,255,255,.94); border-radius: 22px; padding: 18px 12px 14px; min-height: 168px; cursor: pointer; display: grid; justify-items: center; align-content: space-between; gap: 10px; text-align: center; transition: transform .16s ease, box-shadow .16s ease, border-color .16s ease, background .16s ease; animation: cardPop .35s ease both; }
  .shape-card:hover { transform: translateY(-2px); box-shadow: 0 12px 30px rgba(15,23,42,.08); }
  .shape-card.is-selected { border-color: rgba(37,99,235,.95); background: linear-gradient(180deg, #eff6ff, #fff); box-shadow: 0 0 0 3px rgba(37,99,235,.12); }
  .shape-card.is-selected .gem-shape { animation: gemPulse 1.6s ease-in-out infinite; }
  .shape-card .gem-shape { --gem-icon-size: clamp(72px, 6vw, 108px); }
  .shape-label { font-size: .9rem; font-weight: 900; line-height: 1.15; }

  .selected-preview { border: 1px solid var(--line); background: #f9fafb; border-radius: 20px; padding: 16px; display: grid; grid-template-columns: 88px 1fr; gap: 16px; align-items: center; margin-bottom: 16px; }
  .selected-preview .gem-shape { --gem-icon-size: 78px; animation: gemPulse 2.1s ease-in-out infinite; }
  .selected-title { font-weight: 950; letter-spacing: -.02em; }
  .selected-meta { color: var(--muted); line-height: 1.45; font-size: .88rem; margin-top: 4px; }
  .formula-box { font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace; background: #0f172a; color: #dbeafe; border-radius: 16px; padding: 12px; overflow-wrap: anywhere; font-size: .82rem; margin-top: 10px; }
  .dimension-grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 12px; }
  .button-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 14px; }
  .primary-btn, .secondary-btn, .shape-toggle { width: 100%; border-radius: 14px; border: 1px solid var(--line); padding: 12px 13px; cursor: pointer; font-weight: 900; transition: transform .16s ease, box-shadow .16s ease, background .16s ease; }
  .primary-btn { background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #fff; border-color: transparent; box-shadow: 0 10px 24px rgba(37,99,235,.18); }
  .secondary-btn, .shape-toggle { background: #fff; color: var(--ink); }
  .primary-btn:hover, .secondary-btn:hover, .shape-toggle:hover { transform: translateY(-1px); box-shadow: 0 12px 24px rgba(15,23,42,.08); }

  .result-card { margin-top: 16px; border-radius: 22px; border: 1px solid var(--line); background: linear-gradient(180deg, #ffffff, #f8fbff); padding: 22px; animation: resultReveal .45s ease both; }
  .result-label { color: var(--muted); font-size: .9rem; line-height: 1.4; }
  .result-number { font-size: clamp(2.1rem, 5.2vw, 4.4rem); letter-spacing: -.055em; font-weight: 950; line-height: 1; margin: 10px 0 0; background: linear-gradient(135deg, #111827, #2563eb); -webkit-background-clip: text; background-clip: text; color: transparent; white-space: nowrap; max-width: 100%; overflow-x: auto; overflow-y: hidden; padding-bottom: 4px; font-variant-numeric: tabular-nums; }
  .range { font-size: clamp(1.45rem, 3.6vw, 3.2rem); letter-spacing: -.045em; }
  .result-note { color: var(--muted); line-height: 1.45; font-size: .9rem; }
  .warning { color: var(--danger); font-weight: 800; }
  .lead-gate { margin-top: 14px; padding: 16px; background: #fff7ed; border: 1px solid #fed7aa; border-radius: 18px; }
  .is-hidden { display: none !important; }
  .asset-help { display: none; margin: 16px 0; padding: 14px; border-radius: 16px; border: 1px solid #fecaca; background: #fff1f2; color: #7f1d1d; line-height: 1.45; font-size: .9rem; }

  @keyframes floatIn { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }
  @keyframes cardPop { from { opacity: 0; transform: scale(.97); } to { opacity: 1; transform: scale(1); } }
  @keyframes gemPulse { 0%, 100% { filter: drop-shadow(0 0 0 rgba(37,99,235,0)); transform: scale(1); } 50% { filter: drop-shadow(0 10px 18px rgba(37,99,235,.20)); transform: scale(1.035); } }
  @keyframes resultReveal { from { opacity: 0; transform: translateY(10px) scale(.98); } to { opacity: 1; transform: translateY(0) scale(1); } }
  @keyframes slowSpin { to { transform: rotate(360deg); } }

  @media (max-width: 1080px) {
    .calculator-shell { grid-template-columns: 1fr; }
    .right-flow { position: static; order: 2; }
    .left-flow { order: 1; }
    .shape-grid { max-height: none; grid-template-columns: repeat(auto-fill, minmax(112px, 1fr)); }
  }

  @media (min-width: 1081px) {
    .right-flow { order: 2; }
    .left-flow { order: 1; }
  }

  @media (max-width: 760px) {
    .page { width: min(100% - 18px, 1240px); padding-top: 14px; }
    .hero, .panel { border-radius: 18px; padding: 16px; }
    .calculator-shell,
.left-flow,
.result-measure-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  align-items: start;
  padding: 0;
  margin: 0;
}
    .right-flow { order: 2; }
    .left-flow { display: contents; }
    #stonePanel { order: 1; }
    #shapePanel { order: 2; }
    .result-measure-grid { order: 3; }
    .step-header { display: block; }
    .inline-row, .shape-controls, .dimension-grid, .button-row { grid-template-columns: 1fr; }
    .shape-toggle { display: block; margin-top: 12px; }
    .shape-drawer-body { overflow: hidden; max-height: 1050px; transition: max-height .32s ease, opacity .22s ease, margin-top .22s ease; }
    .shape-drawer-body.is-collapsed { max-height: 0; opacity: 0; margin-top: 0; pointer-events: none; }
    .shape-controls { margin-top: 14px; }
    .shape-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; max-height: 430px; }
    .shape-card { min-height: 122px; border-radius: 16px; padding: 12px 8px 10px; }
    .shape-card .gem-shape { --gem-icon-size: 56px; }
    .shape-label { font-size: .82rem; }
    .selected-preview { grid-template-columns: 1fr; justify-items: center; text-align: center; }
    .result-card { padding: 18px; }
    .result-number { font-size: clamp(2rem, 11vw, 3rem); }
    .result-number.range { font-size: clamp(1.45rem, 8vw, 2.3rem); }
  }

  @media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
  }

  .result-cta {
    margin-top: 24px;
    padding-top: 22px;
    border-top: 1px solid var(--line);
  }
  
  .result-cta h3 {
    margin: 0 0 10px;
    font-size: 1.05rem;
    letter-spacing: -.02em;
  }
  
  .result-cta p {
    margin: 0;
    color: var(--muted);
    line-height: 1.55;
    font-size: .95rem;
  }
  
  .result-cta-buttons {
    display: flex;
    gap: 10px;
    margin-top: 18px;
    flex-wrap: wrap;
  }
  
  .result-cta-buttons a {
    text-decoration: none;
  }
  
  @media (max-width: 760px) {
    .result-cta-buttons {
      display: grid;
      grid-template-columns: 1fr;
    }
  }