:root {
  --d3-bg: #100d0b;
  --d3-panel: #1b1512;
  --d3-panel-2: #231b17;
  --d3-paper: #eee2cf;
  --d3-gold: #d2ad61;
  --d3-wine: #6a2d32;
  --d3-text: #f7efe4;
  --d3-muted: #b6a695;
  --d3-line: rgba(226, 199, 151, 0.2);
}

* { box-sizing: border-box; }

html { background: var(--d3-bg); }

body {
  margin: 0;
  color: var(--d3-text);
  background:
    radial-gradient(circle at 78% 8%, rgba(106, 45, 50, 0.28), transparent 32rem),
    linear-gradient(180deg, #100d0b, #15100d 60%, #100d0b);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

a { color: inherit; }

.d3-header {
  position: sticky;
  z-index: 30;
  top: 0;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 24px;
  align-items: center;
  width: min(100% - 32px, 1440px);
  min-height: 74px;
  margin: 0 auto;
  border-bottom: 1px solid var(--d3-line);
  background: rgba(16, 13, 11, 0.8);
  backdrop-filter: blur(18px);
}

.d3-back,
.d3-lang a {
  color: #cabbab;
  text-decoration: none;
  font-size: 12px;
  font-weight: 760;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.d3-back:hover,
.d3-lang a:hover,
.d3-lang a:focus-visible {
  color: var(--d3-gold);
}

.d3-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
}

.d3-brand img {
  width: 94px;
  max-height: 54px;
  object-fit: contain;
}

.d3-brand span {
  color: #8f8071;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.d3-lang {
  display: flex;
  gap: 12px;
}

.d3-lang a[aria-current="page"] { color: var(--d3-gold); }

.d3-shell {
  width: min(100% - 32px, 1440px);
  margin: 0 auto;
  padding: clamp(42px, 6vw, 88px) 0 80px;
}

.d3-hero {
  display: grid;
  grid-template-columns: minmax(300px, 0.72fr) minmax(520px, 1.28fr);
  gap: clamp(36px, 6vw, 90px);
  align-items: center;
  min-height: calc(100svh - 150px);
}

.d3-kicker {
  margin: 0 0 13px;
  color: var(--d3-gold);
  font-size: 10px;
  font-weight: 850;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.d3-copy h1,
.d3-section-head h2 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 500;
  letter-spacing: -0.025em;
}

.d3-copy h1 {
  max-width: 650px;
  font-size: clamp(54px, 7.8vw, 108px);
  line-height: 0.88;
}

.d3-copy h1 span {
  display: block;
  color: var(--d3-gold);
  font-style: italic;
}

.d3-lead {
  max-width: 620px;
  margin: 26px 0 0;
  color: #d9ccbc;
  font: 20px/1.55 Georgia, "Times New Roman", serif;
}

.d3-note {
  max-width: 590px;
  margin: 20px 0 0;
  color: #8f8174;
  font-size: 13px;
  line-height: 1.6;
}

.d3-stage-wrap {
  position: relative;
  min-width: 0;
}

.d3-stage {
  position: relative;
  min-height: min(72vh, 720px);
  overflow: hidden;
  border: 1px solid var(--d3-line);
  background:
    radial-gradient(circle at 50% 42%, rgba(210, 173, 97, 0.11), transparent 38%),
    linear-gradient(160deg, #241b17, #14100d 72%);
}

#d3-model {
  width: 100%;
  height: min(72vh, 720px);
  min-height: 540px;
  background: transparent;
  --poster-color: transparent;
}

.d3-ar-button {
  margin: 0 0 24px 24px;
  min-height: 44px;
  padding: 10px 15px;
  border: 1px solid var(--d3-gold);
  color: #1e1712;
  background: var(--d3-gold);
  font: inherit;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.04em;
  cursor: pointer;
}

.d3-stage-meta {
  position: absolute;
  z-index: 4;
  right: 22px;
  bottom: 20px;
  left: 22px;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  pointer-events: none;
}

.d3-stage-meta > div {
  padding: 14px 16px;
  background: rgba(16, 13, 11, 0.78);
  backdrop-filter: blur(12px);
}

.d3-stage-meta span {
  display: block;
  margin-bottom: 5px;
  color: var(--d3-gold);
  font-size: 9px;
  font-weight: 850;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.d3-stage-meta strong {
  display: block;
  max-width: 440px;
  color: #fff5e9;
  font: 500 clamp(21px, 2vw, 30px)/1.08 Georgia, serif;
}

.d3-controls {
  display: flex;
  gap: 8px;
  pointer-events: auto;
}

.d3-controls button {
  min-height: 40px;
  padding: 8px 12px;
  border: 1px solid rgba(210, 173, 97, 0.44);
  color: #eadfce;
  background: rgba(16, 13, 11, 0.83);
  font: inherit;
  font-size: 11px;
  font-weight: 760;
  cursor: pointer;
}

.d3-controls button:hover,
.d3-controls button:focus-visible {
  border-color: var(--d3-gold);
}

.d3-section {
  padding: clamp(72px, 8vw, 118px) 0 0;
}

.d3-section-head {
  display: grid;
  grid-template-columns: minmax(0, 0.78fr) minmax(320px, 1fr);
  gap: 48px;
  align-items: end;
  margin-bottom: 34px;
}

.d3-section-head h2 {
  font-size: clamp(40px, 5.8vw, 70px);
  line-height: 0.98;
}

.d3-section-head p:last-child {
  max-width: 650px;
  margin: 0;
  color: var(--d3-muted);
  font-size: 16px;
  line-height: 1.65;
}

.d3-group {
  margin-top: 44px;
}

.d3-group-head {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: baseline;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--d3-line);
}

.d3-group-head h3 {
  margin: 0;
  color: #eadfce;
  font: 500 26px/1 Georgia, serif;
}

.d3-group-head span {
  color: #7f7165;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.d3-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-left: 1px solid var(--d3-line);
}

.d3-model-choice {
  position: relative;
  min-height: 176px;
  padding: 24px;
  border: 0;
  border-right: 1px solid var(--d3-line);
  border-bottom: 1px solid var(--d3-line);
  color: #e9dece;
  background: rgba(255, 255, 255, 0.018);
  text-align: left;
  cursor: pointer;
  transition: background 180ms ease, transform 180ms ease;
}

.d3-model-choice:hover,
.d3-model-choice:focus-visible {
  z-index: 2;
  background: rgba(210, 173, 97, 0.07);
  transform: translateY(-2px);
}

.d3-model-choice[aria-current="true"] {
  background:
    radial-gradient(circle at 100% 0%, rgba(210, 173, 97, 0.16), transparent 50%),
    rgba(106, 45, 50, 0.13);
}

.d3-model-choice span {
  display: block;
  margin-bottom: 34px;
  color: #8e7f70;
  font-size: 9px;
  font-weight: 850;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.d3-model-choice strong {
  display: block;
  max-width: 260px;
  color: #fff1e0;
  font: 500 23px/1.08 Georgia, serif;
}

.d3-model-choice small {
  display: block;
  margin-top: 10px;
  color: #9f9183;
  font-size: 11px;
  line-height: 1.45;
}

.d3-model-choice::after {
  position: absolute;
  top: 20px;
  right: 21px;
  content: "↗";
  color: var(--d3-gold);
  font-size: 18px;
}

.d3-footer {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  margin-top: 90px;
  padding: 30px 0 10px;
  border-top: 1px solid var(--d3-line);
  color: #7f7165;
  font-size: 11px;
}

.d3-footer a {
  color: #bbaa98;
  text-decoration: none;
}

.d3-footer a:hover { color: var(--d3-gold); }

.d3-loading {
  position: absolute;
  z-index: 3;
  top: 20px;
  left: 20px;
  padding: 9px 12px;
  color: #d8c8b7;
  background: rgba(16, 13, 11, 0.72);
  font-size: 10px;
  font-weight: 780;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.d3-loading[hidden] { display: none; }

@media (max-width: 1050px) {
  .d3-hero {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .d3-copy { max-width: 780px; }

  .d3-stage { min-height: 620px; }
  #d3-model { height: 620px; min-height: 620px; }

  .d3-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 760px) {
  .d3-header,
  .d3-shell {
    width: min(100% - 24px, 1440px);
  }

  .d3-header {
    grid-template-columns: auto 1fr;
  }

  .d3-lang { display: none; }

  .d3-brand {
    justify-content: flex-end;
  }

  .d3-brand span { display: none; }

  .d3-shell { padding-top: 40px; }

  .d3-copy h1 { font-size: clamp(52px, 16vw, 84px); }

  .d3-stage,
  #d3-model {
    min-height: 500px;
    height: 500px;
  }

  .d3-stage-meta {
    align-items: stretch;
    flex-direction: column;
  }

  .d3-controls {
    align-self: flex-start;
  }

  .d3-section-head {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .d3-grid { grid-template-columns: 1fr; }

  .d3-model-choice { min-height: 150px; }

  .d3-footer { flex-direction: column; }
}

@media (max-width: 520px) {
  .d3-stage,
  #d3-model {
    min-height: 430px;
    height: 430px;
  }

  .d3-stage-meta {
    right: 12px;
    bottom: 12px;
    left: 12px;
  }

  .d3-controls {
    width: 100%;
  }

  .d3-controls button {
    flex: 1;
  }
}


html[dir="rtl"] body {
  font-family: Tahoma, "Segoe UI", Arial, sans-serif;
}

html[dir="rtl"] .d3-copy h1,
html[dir="rtl"] .d3-section-head h2,
html[dir="rtl"] .d3-group-head h3,
html[dir="rtl"] .d3-model-choice strong,
html[dir="rtl"] .d3-stage-meta strong,
html[dir="rtl"] .d3-lead {
  font-family: Tahoma, "Segoe UI", Arial, sans-serif;
  letter-spacing: 0;
}

html[dir="rtl"] .d3-model-choice {
  text-align: right;
}

html[dir="rtl"] .d3-model-choice::after {
  right: auto;
  left: 21px;
  content: "↖";
}