:root {
  --bg-a: #eff4ef;
  --bg-b: #dce6e8;
  --ink: #102224;
  --panel: #102527;
  --panel-alt: #183437;
  --panel-ink: #ecf6f4;
  --line: rgba(236, 246, 244, 0.22);
  --brand: #f97316;
  --brand-soft: rgba(249, 115, 22, 0.2);
  --card: #f7f3e9;
  --shadow: 0 20px 40px rgba(12, 32, 35, 0.2);
}

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
}

body {
  font-family: "Trebuchet MS", "Gill Sans", "Segoe Print", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 20% 10%, rgba(255, 245, 214, 0.9), transparent 40%),
    radial-gradient(circle at 80% 90%, rgba(142, 205, 211, 0.5), transparent 45%),
    linear-gradient(160deg, var(--bg-a), var(--bg-b));
  overflow: hidden;
  overscroll-behavior: none;
}

.app-shell {
  height: 100dvh;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  overflow: hidden;
}

.top-bar {
  padding: calc(0.65rem + env(safe-area-inset-top)) 0.95rem 0.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(16, 34, 36, 0.15);
  backdrop-filter: blur(8px);
}

.top-bar h1 {
  margin: 0;
  font-size: clamp(0.92rem, 3.4vw, 1.35rem);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.reset-btn {
  border: 1px solid rgba(16, 34, 36, 0.3);
  background: #fff9ec;
  color: var(--ink);
  border-radius: 999px;
  padding: 0.45rem 0.95rem;
  font-weight: 700;
  cursor: pointer;
}

.reset-btn:active {
  transform: translateY(1px);
}

.scene-wrap {
  position: relative;
  min-height: 0;
  padding: 0.5rem 0.55rem;
}

.scene-canvas {
  height: 100%;
  width: 100%;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow);
  background:
    radial-gradient(circle at 25% 20%, rgba(226, 245, 246, 0.24), rgba(19, 35, 35, 0.88));
}

.scene-canvas canvas {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
}

.scene-hint {
  position: absolute;
  left: 1.05rem;
  bottom: 1.05rem;
  color: #f4ffff;
  font-size: 0.74rem;
  padding: 0.28rem 0.58rem;
  border-radius: 999px;
  background: rgba(10, 28, 30, 0.54);
  pointer-events: none;
}

.materials-panel {
  background: linear-gradient(180deg, var(--panel-alt), var(--panel));
  border-top: 1px solid var(--line);
  color: var(--panel-ink);
  padding: 0.7rem 0.75rem calc(0.82rem + env(safe-area-inset-bottom));
  max-height: 38dvh;
  min-height: 170px;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.zone-switch {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.55rem;
  position: sticky;
  top: 0;
}

.zone-btn {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.52rem 0.7rem;
  color: var(--panel-ink);
  background: transparent;
  font-weight: 700;
  letter-spacing: 0.03em;
  cursor: pointer;
}

.zone-btn.active {
  background: var(--brand-soft);
  border-color: rgba(249, 115, 22, 0.65);
  color: #fff8ef;
}

.wall-picker-wrap {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.wall-picker-label {
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: #dce9e7;
  text-transform: uppercase;
}

.wall-picker {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.45rem;
}

.wall-btn {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: transparent;
  color: var(--panel-ink);
  font-weight: 700;
  padding: 0.38rem 0.2rem;
  cursor: pointer;
}

.wall-btn.active {
  border-color: rgba(249, 115, 22, 0.86);
  background: rgba(249, 115, 22, 0.22);
  color: #fff6eb;
}

.wall-map {
  font-size: 0.66rem;
  color: #b7caca;
  letter-spacing: 0.02em;
}

.materials-list {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(96px, 96px);
  gap: 0.6rem;
  overflow-x: auto;
  overflow-y: hidden;
  padding-bottom: 0.24rem;
  min-height: 0;
}

.materials-list::-webkit-scrollbar {
  height: 8px;
}

.materials-list::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.24);
  border-radius: 999px;
}

.material-card {
  border: 1px solid rgba(255, 255, 255, 0.28);
  background: rgba(247, 243, 233, 0.12);
  border-radius: 12px;
  overflow: hidden;
  cursor: pointer;
  color: #f3faf9;
  padding: 0;
  display: grid;
  grid-template-rows: 1fr auto;
  min-width: 96px;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.18);
}

.material-card.active {
  border-color: rgba(249, 115, 22, 0.9);
  box-shadow: 0 0 0 2px rgba(249, 115, 22, 0.38);
}

.material-preview {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  display: block;
  background: var(--card);
}

.material-label {
  display: block;
  text-align: center;
  font-size: 0.68rem;
  line-height: 1.15;
  padding: 0.35rem 0.15rem 0.45rem;
  letter-spacing: 0.02em;
}

@media (min-width: 980px) {
  .app-shell {
    grid-template-columns: 320px 1fr;
    grid-template-rows: auto 1fr;
    grid-template-areas:
      "top top"
      "panel scene";
  }

  .top-bar {
    grid-area: top;
    padding: 1rem 1.2rem;
  }

  .materials-panel {
    grid-area: panel;
    border-top: none;
    border-right: 1px solid var(--line);
    padding: 1rem;
    max-height: none;
    min-height: 0;
  }

  .materials-list {
    grid-auto-flow: row;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    grid-auto-columns: unset;
    overflow-y: auto;
    overflow-x: hidden;
    padding-right: 0.25rem;
    padding-bottom: 1rem;
  }

  .scene-wrap {
    grid-area: scene;
    padding: 1rem;
  }

  .scene-hint {
    font-size: 0.82rem;
  }
}