:root {
  color-scheme: light;
  --ink: #172d4a;
  --muted: #5f7390;
  --accent: #2d73c8;
  --accent-strong: #175da9;
  --accent-soft: #dcecff;
  --surface: rgba(255, 255, 255, 0.72);
  --surface-solid: #f8fbff;
  --line: rgba(58, 104, 163, 0.18);
  --shadow: 0 24px 70px rgba(36, 83, 140, 0.16);
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  min-width: 320px;
  height: 100%;
  margin: 0;
}

body {
  position: relative;
  overflow: hidden;
  color: var(--ink);
  background:
    radial-gradient(circle at 50% 42%, rgba(255, 255, 255, 0.92) 0 18%, rgba(235, 245, 255, 0.78) 54%, rgba(216, 233, 252, 0.86) 100%),
    #eaf4ff;
}

button,
a {
  font: inherit;
  -webkit-tap-highlight-color: transparent;
}

button {
  color: inherit;
}

button:focus-visible,
a:focus-visible {
  outline: 3px solid rgba(45, 115, 200, 0.35);
  outline-offset: 3px;
}

.ambient,
.grid {
  position: fixed;
  inset: 0;
  pointer-events: none;
}

.grid {
  opacity: 0.46;
  background-image:
    linear-gradient(rgba(61, 116, 181, 0.065) 1px, transparent 1px),
    linear-gradient(90deg, rgba(61, 116, 181, 0.065) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.8), transparent 82%);
}

.ambient {
  border-radius: 999px;
  filter: blur(3px);
  opacity: 0.64;
}

.ambient-one {
  width: 34rem;
  height: 34rem;
  inset: auto auto -18rem -12rem;
  background: rgba(85, 175, 255, 0.25);
}

.ambient-two {
  width: 26rem;
  height: 26rem;
  inset: -14rem -8rem auto auto;
  background: rgba(130, 199, 255, 0.25);
}

.app-header {
  position: fixed;
  z-index: 40;
  top: 0;
  left: 0;
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  padding: calc(1rem + var(--safe-top)) clamp(1rem, 3vw, 2.25rem) 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--ink);
  text-decoration: none;
}

.brand-cluster {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 0.65rem;
}

.brand-mark {
  display: grid;
  width: 2.65rem;
  height: 2.65rem;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: 0.85rem;
  color: white;
  background: linear-gradient(145deg, #1e3b61, #2f75c5);
  box-shadow: 0 12px 26px rgba(31, 78, 132, 0.22);
  font-size: 0.78rem;
  font-weight: 750;
  letter-spacing: 0.06em;
}

.brand-name {
  font-size: clamp(1rem, 2vw, 1.28rem);
  font-weight: 720;
  letter-spacing: -0.035em;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.platform-badge {
  padding: 0.62rem 0.8rem;
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: 999px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.56);
  box-shadow: 0 8px 24px rgba(37, 81, 132, 0.08);
  backdrop-filter: blur(18px);
  font-size: 0.78rem;
  font-weight: 650;
}

.icon-button {
  display: grid;
  width: 2.7rem;
  height: 2.7rem;
  padding: 0;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.78);
  border-radius: 0.85rem;
  background: rgba(255, 255, 255, 0.62);
  box-shadow: 0 10px 28px rgba(37, 81, 132, 0.11);
  cursor: pointer;
  backdrop-filter: blur(18px);
  transition: transform 180ms ease, background-color 180ms ease;
}

.icon-button:hover {
  background: rgba(255, 255, 255, 0.88);
  transform: translateY(-1px);
}

.icon-button:active {
  transform: translateY(1px) scale(0.97);
}

.menu-button span {
  width: 0.24rem;
  height: 0.24rem;
  border-radius: 50%;
  background: currentColor;
}

.menu-button {
  gap: 0.19rem;
}

.viewer-shell {
  position: relative;
  width: 100%;
  height: 100dvh;
  min-height: 32rem;
  overflow: hidden;
}

.carousel-viewport,
.carousel-track,
.carousel-slide {
  width: 100%;
  height: 100%;
}

.viewer-stage,
.carousel-viewport {
  position: absolute;
  inset: 0;
}

.viewer-stage {
  z-index: 1;
}

.carousel-viewport {
  z-index: 2;
  overflow: hidden;
  pointer-events: none;
}

.carousel-track {
  display: flex;
  will-change: transform;
  transition: transform 680ms cubic-bezier(0.22, 1, 0.36, 1);
}

.carousel-track.is-dragging {
  transition: none;
}

.carousel-slide {
  position: relative;
  flex: 0 0 100%;
  overflow: hidden;
}

.model-slide::after,
.empty-slide::after {
  position: absolute;
  inset: 0;
  content: "";
  pointer-events: none;
  background: linear-gradient(to bottom, rgba(235, 245, 255, 0.42), transparent 20%);
}

.three-viewer {
  width: 100%;
  height: 100%;
  background: transparent;
  touch-action: none;
  transition: opacity 220ms ease, filter 220ms ease, transform 320ms ease;
}

.viewer-stage.is-switching .three-viewer {
  opacity: 0.48;
  filter: saturate(0.72);
  transform: scale(0.995);
}

.three-viewer canvas {
  display: block;
  width: 100%;
  height: 100%;
  cursor: grab;
}

.three-viewer canvas:active {
  cursor: grabbing;
}

.model-progress {
  position: absolute;
  right: 12%;
  bottom: 1.5rem;
  left: 12%;
  z-index: 9;
  height: 0.2rem;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(45, 115, 200, 0.13);
  transition: opacity 220ms ease;
}

.model-progress span {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: var(--accent);
  transition: width 160ms ease;
}

.model-progress.is-complete {
  opacity: 0;
}

.loading-card {
  position: absolute;
  z-index: 6;
  top: 50%;
  left: 50%;
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.78rem 1rem;
  border: 1px solid rgba(255, 255, 255, 0.82);
  border-radius: 999px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.72);
  box-shadow: 0 12px 32px rgba(39, 83, 134, 0.12);
  backdrop-filter: blur(16px);
  transform: translate(-50%, -50%);
  transition: opacity 240ms ease, visibility 240ms ease;
  font-size: 0.86rem;
  font-weight: 650;
}

.loading-card.is-hidden {
  visibility: hidden;
  opacity: 0;
}

.loading-ring {
  width: 1rem;
  height: 1rem;
  border: 2px solid rgba(45, 115, 200, 0.2);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 850ms linear infinite;
}

.empty-slide {
  background: transparent;
}

.model-index {
  position: fixed;
  z-index: 12;
  top: calc(5.75rem + var(--safe-top));
  right: clamp(1rem, 3vw, 2.25rem);
  display: inline-flex;
  gap: 0.35rem;
  align-items: baseline;
  color: #71839c;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

#currentIndex {
  color: var(--ink);
  font-size: 1rem;
}

.index-divider {
  opacity: 0.45;
}

.carousel-arrow {
  position: fixed;
  z-index: 12;
  top: 50%;
  display: grid;
  width: 2.75rem;
  height: 4rem;
  padding: 0;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.7);
  border-radius: 1rem;
  background: rgba(255, 255, 255, 0.42);
  box-shadow: 0 12px 30px rgba(38, 80, 130, 0.1);
  cursor: pointer;
  backdrop-filter: blur(14px);
  transform: translateY(-50%);
  transition: opacity 180ms ease, transform 180ms ease, background-color 180ms ease;
}

.carousel-arrow:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.78);
  transform: translateY(-50%) scale(1.04);
}

.carousel-arrow:disabled {
  opacity: 0.2;
  cursor: default;
}

.carousel-arrow svg {
  width: 1.4rem;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

.arrow-previous {
  left: clamp(0.75rem, 2vw, 1.5rem);
}

.arrow-next {
  right: clamp(0.75rem, 2vw, 1.5rem);
}

.model-details {
  position: fixed;
  z-index: 14;
  left: clamp(1rem, 4vw, 3.25rem);
  bottom: calc(2rem + var(--safe-bottom));
  width: min(34rem, calc(100vw - 8rem));
  transition: opacity 240ms ease, transform 240ms ease, visibility 240ms ease;
}

.model-details.is-empty {
  visibility: hidden;
  opacity: 0;
  transform: translateY(1rem);
}

.eyebrow {
  margin: 0 0 0.45rem;
  color: var(--accent-strong);
  font-size: 0.72rem;
  font-weight: 760;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.model-details h1,
.control-panel h2,
.control-panel h3 {
  margin: 0;
  letter-spacing: -0.045em;
}

.model-details h1 {
  font-size: clamp(1.7rem, 4vw, 3.25rem);
  font-weight: 735;
}

.variant-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.variant-button {
  min-height: 2.45rem;
  padding: 0.55rem 0.85rem;
  border: 1px solid rgba(46, 103, 170, 0.22);
  border-radius: 0.72rem;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.64);
  box-shadow: 0 6px 18px rgba(34, 77, 128, 0.07);
  cursor: pointer;
  backdrop-filter: blur(12px);
  transition: color 170ms ease, background-color 170ms ease, border-color 170ms ease, transform 170ms ease;
  font-size: 0.82rem;
  font-weight: 680;
}

.variant-button:hover {
  transform: translateY(-1px);
}

.variant-button.is-active {
  border-color: transparent;
  color: white;
  background: var(--accent);
}

.variant-button[data-available="false"] {
  border-style: dashed;
  color: #6d8099;
}

.viewer-action-stack {
  position: absolute;
  z-index: 50;
  top: calc(0.8rem + var(--safe-top));
  left: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.65rem;
  transform: translateX(-50%);
}

.environment-controls {
  display: flex;
  gap: 0.4rem;
  padding: 0.3rem;
  border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.42);
  box-shadow: 0 10px 28px rgba(37, 81, 132, 0.09);
  backdrop-filter: blur(14px);
}

.environment-button {
  min-width: 4.8rem;
  border-radius: 999px;
}

.environment-button:disabled,
.doors-button:disabled {
  cursor: wait;
  opacity: 0.48;
}

.doors-button {
  min-width: 5.75rem;
  border-radius: 999px;
}

.carousel-footer {
  position: fixed;
  z-index: 15;
  bottom: calc(1.45rem + var(--safe-bottom));
  left: 50%;
  display: flex;
  min-width: 9.5rem;
  flex-direction: column;
  align-items: center;
  gap: 0.42rem;
  padding: 0.45rem 0.8rem 0.35rem;
  border-radius: 1rem;
  cursor: grab;
  transform: translateX(-50%);
  user-select: none;
  touch-action: pan-y;
}

.carousel-footer:active {
  cursor: grabbing;
}

.swipe-handle {
  width: 2.4rem;
  height: 0.2rem;
  border-radius: 999px;
  background: rgba(66, 101, 145, 0.22);
}

.navigation-dots {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.navigation-dot {
  width: 0.48rem;
  height: 0.48rem;
  padding: 0;
  border: 0;
  border-radius: 999px;
  background: rgba(49, 100, 160, 0.25);
  cursor: pointer;
  transition: width 220ms ease, background-color 220ms ease;
}

.navigation-dot.is-active {
  width: 1.5rem;
  background: var(--accent);
}

.swipe-label {
  color: #7688a0;
  font-size: 0.68rem;
  font-weight: 620;
  letter-spacing: 0.03em;
}

.panel-backdrop {
  position: fixed;
  z-index: 70;
  inset: 0;
  background: rgba(21, 45, 76, 0.18);
  backdrop-filter: blur(3px);
  opacity: 0;
  transition: opacity 260ms ease;
}

.panel-backdrop.is-visible {
  opacity: 1;
}

.control-panel {
  position: fixed;
  z-index: 80;
  top: 0;
  right: 0;
  width: min(25rem, 92vw);
  height: 100dvh;
  padding: calc(1.25rem + var(--safe-top)) 1.25rem calc(1.25rem + var(--safe-bottom));
  overflow-y: auto;
  border-left: 1px solid rgba(255, 255, 255, 0.76);
  color: var(--ink);
  background: rgba(247, 251, 255, 0.88);
  box-shadow: -24px 0 70px rgba(28, 66, 112, 0.16);
  backdrop-filter: blur(28px);
  transform: translateX(105%);
  transition: transform 420ms cubic-bezier(0.22, 1, 0.36, 1);
}

.control-panel.is-open {
  transform: translateX(0);
}

.panel-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 1.25rem;
}

.control-panel h2 {
  font-size: 1.55rem;
}

.close-button svg,
.panel-action svg {
  width: 1.25rem;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

.panel-section {
  padding: 1.15rem 0;
  border-top: 1px solid var(--line);
}

.setting-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.setting-row strong,
.setting-row span {
  display: block;
}

.setting-row strong {
  font-size: 0.95rem;
}

.setting-row div > span {
  margin-top: 0.22rem;
  color: var(--muted);
  font-size: 0.78rem;
}

.switch {
  position: relative;
  width: 3rem;
  height: 1.75rem;
  flex: 0 0 auto;
  padding: 0;
  border: 0;
  border-radius: 999px;
  background: #cbd8e7;
  cursor: pointer;
  transition: background-color 180ms ease;
}

.switch span {
  position: absolute;
  top: 0.2rem;
  left: 0.2rem;
  width: 1.35rem;
  height: 1.35rem;
  border-radius: 50%;
  background: white;
  box-shadow: 0 3px 8px rgba(27, 61, 102, 0.2);
  transition: transform 180ms ease;
}

.switch.is-on {
  background: var(--accent);
}

.switch.is-on span {
  transform: translateX(1.25rem);
}

.panel-action {
  display: inline-flex;
  width: 100%;
  min-height: 2.85rem;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  margin-top: 1rem;
  border: 1px solid var(--line);
  border-radius: 0.8rem;
  background: rgba(255, 255, 255, 0.65);
  cursor: pointer;
  font-size: 0.86rem;
  font-weight: 680;
}

.control-guide h3 {
  margin-bottom: 0.8rem;
  font-size: 1rem;
}

.control-guide p {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin: 0.55rem 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.control-guide p span {
  color: var(--ink);
  font-weight: 650;
}

.panel-note {
  margin: 1rem 0 0;
  color: #71839a;
  font-size: 0.78rem;
  line-height: 1.55;
}

.toast {
  position: fixed;
  z-index: 100;
  top: calc(5.25rem + var(--safe-top));
  left: 50%;
  max-width: calc(100vw - 2rem);
  padding: 0.72rem 0.95rem;
  border: 1px solid rgba(255, 255, 255, 0.78);
  border-radius: 999px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.88);
  box-shadow: 0 16px 36px rgba(28, 69, 116, 0.16);
  opacity: 0;
  pointer-events: none;
  backdrop-filter: blur(16px);
  transform: translate(-50%, -0.8rem);
  transition: opacity 220ms ease, transform 220ms ease;
  font-size: 0.82rem;
  font-weight: 650;
  text-align: center;
}

.toast.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

@media (max-width: 760px) {
  .app-header {
    padding-right: 0.85rem;
    padding-left: 0.85rem;
  }

  .platform-badge,
  .carousel-arrow,
  .swipe-label {
    display: none;
  }

  .brand-name {
    font-size: 1rem;
  }

  .model-index {
    top: calc(4.9rem + var(--safe-top));
    right: 1rem;
  }

  .viewer-action-stack {
    top: calc(4.8rem + var(--safe-top));
  }

  .environment-button {
    min-width: 4.3rem;
    padding-right: 0.7rem;
    padding-left: 0.7rem;
  }

  .model-details {
    right: 1rem;
    bottom: calc(5.25rem + var(--safe-bottom));
    left: 1rem;
    width: auto;
  }

  .model-details h1 {
    font-size: clamp(1.55rem, 8vw, 2.25rem);
  }

  .variant-controls {
    flex-wrap: nowrap;
    max-width: 100%;
    overflow-x: auto;
    padding: 0.15rem 0 0.35rem;
    scrollbar-width: none;
  }

  .variant-controls::-webkit-scrollbar {
    display: none;
  }

  .variant-button {
    flex: 0 0 auto;
  }

  .carousel-footer {
    bottom: calc(1.05rem + var(--safe-bottom));
    min-width: 12rem;
    padding: 0.8rem 1rem;
  }

}

@media (max-height: 610px) and (orientation: landscape) {
  .model-details {
    bottom: 1rem;
    max-width: 28rem;
  }

  .eyebrow,
  .carousel-footer {
    display: none;
  }

  .variant-controls {
    margin-top: 0.55rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}