:root {
  --bg: #06080b;
  --panel: #0e1116;
  --panel-2: #161b23;
  --panel-3: #1d2430;
  --ink: #f4f1ea;
  --muted: #98a2b3;
  --line: #272f3b;
  --accent: #ff7a59;
  --accent-2: #6ec8ff;
  --glow: rgba(255, 122, 89, 0.35);
  --shadow: 0 18px 54px rgba(0, 0, 0, 0.68);
  --radius: 18px;
  --safe-b: env(safe-area-inset-bottom, 0px);
  --safe-t: env(safe-area-inset-top, 0px);
  --font: "Segoe UI", system-ui, -apple-system, Roboto, "Helvetica Neue", sans-serif;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

html, body { height: 100%; margin: 0; }
body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  overflow: hidden;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); border: 0;
}

#app {
  display: grid;
  grid-template-rows: auto 1fr;
  height: 100%;
  height: 100vh;
  height: 100dvh;
}

.topbar {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: calc(10px + var(--safe-t)) 14px 10px;
  background: linear-gradient(180deg, rgba(6,8,11,0.96), rgba(6,8,11,0.78));
  border-bottom: 1px solid rgba(255,255,255,0.06);
  z-index: 30;
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

.brand { display: flex; flex-direction: column; min-width: 0; flex: 1; }
.logo {
  font-weight: 700;
  letter-spacing: 0.03em;
  font-size: 1.02rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.tag {
  font-size: 0.66rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.13em;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.model-picker {
  position: relative;
  display: flex;
  align-items: center;
  min-width: 0;
}

.model-trigger {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--line);
  background: var(--panel-2);
  padding: 6px 12px 6px 8px;
  border-radius: 999px;
  font: inherit;
  font-size: 0.82rem;
  max-width: min(56vw, 390px);
  color: var(--ink);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.model-trigger:hover,
.model-trigger[aria-expanded="true"] {
  border-color: rgba(255, 122, 89, 0.55);
  background: var(--panel-3);
}
.model-trigger-folder {
  flex-shrink: 0;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: 999px;
  background: rgba(255, 122, 89, 0.16);
  color: #ffb49f;
  border: 1px solid rgba(255, 122, 89, 0.32);
}
.model-trigger-folder.custom {
  background: rgba(110, 200, 255, 0.15);
  color: #9edaff;
  border-color: rgba(110, 200, 255, 0.34);
}
.model-trigger-name {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-weight: 600;
}
.model-trigger-caret {
  flex-shrink: 0;
  color: var(--muted);
  font-size: 0.78rem;
}

@media (max-width: 520px) {
  .model-trigger-folder {
    display: none;
  }
  .model-trigger {
    padding-left: 12px;
    max-width: 50vw;
  }
}

.model-menu {
  position: fixed;
  top: calc(58px + var(--safe-t));
  right: 10px;
  left: 10px;
  max-width: 440px;
  margin-left: auto;
  max-height: min(76vh, 620px);
  display: flex;
  flex-direction: column;
  background: rgba(13, 16, 22, 0.98);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 18px;
  box-shadow: var(--shadow);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  z-index: 50;
  overflow: hidden;
}

.model-menu-head {
  padding: 12px 12px 10px;
  border-bottom: 1px solid var(--line);
  background: rgba(18, 23, 31, 0.72);
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.model-search-wrap {
  position: relative;
}
.model-search {
  width: 100%;
  border: 1px solid var(--line);
  background: #0b0e13;
  color: var(--ink);
  border-radius: 11px;
  padding: 8px 12px;
  font: inherit;
  font-size: 0.84rem;
  outline: none;
}
.model-search:focus {
  border-color: rgba(255, 122, 89, 0.6);
}
.model-search::placeholder {
  color: #6b7586;
}

.folder-tabs {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: none;
}
.folder-tabs::-webkit-scrollbar { display: none; }
.folder-tab {
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--muted);
  border-radius: 999px;
  padding: 5px 11px;
  font: inherit;
  font-size: 0.74rem;
  font-weight: 600;
  white-space: nowrap;
  cursor: pointer;
}
.folder-tab.active {
  background: rgba(255, 122, 89, 0.18);
  border-color: rgba(255, 122, 89, 0.5);
  color: #ffb49f;
}

.model-menu-body {
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: 8px 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.folder-group {
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 13px;
  background: rgba(255, 255, 255, 0.015);
  overflow: hidden;
}
.folder-header {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  border: 0;
  background: rgba(255, 255, 255, 0.035);
  color: var(--ink);
  padding: 9px 12px;
  font: inherit;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  cursor: pointer;
  text-align: left;
}
.folder-header:hover {
  background: rgba(255, 255, 255, 0.06);
}
.folder-header-left {
  display: flex;
  align-items: center;
  gap: 7px;
}
.folder-icon {
  font-size: 0.9rem;
}
.folder-count {
  font-size: 0.7rem;
  color: var(--muted);
  font-weight: 600;
  background: rgba(255, 255, 255, 0.06);
  padding: 2px 7px;
  border-radius: 999px;
}
.folder-items {
  padding: 4px 6px 6px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.cat-subhead {
  font-size: 0.66rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
  font-weight: 700;
  padding: 7px 8px 3px;
}
.model-option {
  width: 100%;
  border: 1px solid transparent;
  background: transparent;
  color: var(--ink);
  border-radius: 10px;
  padding: 7px 9px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  font: inherit;
  font-size: 0.82rem;
  text-align: left;
  cursor: pointer;
}
.model-option:hover {
  background: rgba(255, 255, 255, 0.05);
}
.model-option.active {
  background: rgba(255, 122, 89, 0.14);
  border-color: rgba(255, 122, 89, 0.42);
  color: #fff;
}
.model-option-main {
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
}
.model-dots {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}
.model-dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  border: 1px solid rgba(0, 0, 0, 0.55);
  margin-left: -3px;
}
.model-dot:first-child {
  margin-left: 0;
}
.model-option-title {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.model-option-meta {
  flex-shrink: 0;
  font-size: 0.69rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}
.menu-empty {
  padding: 18px 12px;
  text-align: center;
  color: var(--muted);
  font-size: 0.82rem;
}

.icon-btn {
  width: 40px; height: 40px; border-radius: 12px;
  border: 1px solid var(--line); background: var(--panel-2);
  color: var(--ink); font-size: 1.05rem; cursor: pointer;
  flex-shrink: 0;
}

#viewport {
  position: relative;
  min-height: 0;
  background:
    radial-gradient(ellipse at 50% 45%, #111620 0%, #080a0e 52%, #030406 100%);
}
#c { width: 100%; height: 100%; display: block; touch-action: none; }

.labels { position: absolute; inset: 0; pointer-events: none; overflow: hidden; }
.float-label {
  position: absolute;
  transform: translate(-50%, -120%);
  background: rgba(12, 15, 20, 0.88);
  border: 1px solid rgba(255,255,255,0.12);
  color: var(--ink);
  font-size: 0.68rem;
  padding: 4px 8px;
  border-radius: 999px;
  white-space: nowrap;
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  opacity: 0;
  transition: opacity 0.15s;
  pointer-events: none;
  box-shadow: 0 4px 16px rgba(0,0,0,0.55);
}
.float-label.show { opacity: 1; }
.float-label.hot {
  border-color: rgba(255,122,89,0.65);
  box-shadow: 0 0 0 1px rgba(255,122,89,0.28), 0 6px 18px rgba(0,0,0,0.6);
}

.part-card {
  position: absolute;
  left: 12px; right: 12px; top: 12px;
  max-width: 340px;
  display: flex; gap: 12px; align-items: flex-start;
  background: rgba(14,17,22,0.92);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 16px;
  padding: 12px 14px;
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow);
  z-index: 4;
}
.part-card[hidden] { display: none !important; }
.part-card-swatch {
  width: 36px; height: 36px; border-radius: 10px; flex-shrink: 0;
  border: 1px solid rgba(255,255,255,0.14);
}
.part-card-body { min-width: 0; flex: 1; }
.part-card h3 { margin: 0 0 6px; font-size: 1rem; padding-right: 16px; }
.part-card dl { margin: 0; display: grid; gap: 2px; }
.part-card dl > div { display: grid; grid-template-columns: 64px 1fr; gap: 6px; font-size: 0.78rem; }
.part-card dt { color: var(--muted); }
.part-card dd { margin: 0; font-variant-numeric: tabular-nums; }
.part-card-close {
  position: absolute; top: 6px; right: 8px;
  border: 0; background: transparent; color: var(--muted);
  font-size: 1.2rem; cursor: pointer; line-height: 1;
}

.fab-bar {
  position: absolute;
  left: 50%; bottom: calc(84px + var(--safe-b));
  transform: translateX(-50%);
  display: flex; gap: 8px;
  z-index: 4;
  padding: 6px;
  background: rgba(14,17,22,0.82);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 999px;
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}
.fab {
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--ink);
  border-radius: 999px;
  padding: 10px 14px;
  font: inherit;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
}
.fab.primary {
  background: linear-gradient(135deg, #ff8a68, #ff5d6c);
  border-color: transparent;
  color: #1a0b08;
  box-shadow: 0 6px 20px var(--glow);
}
.fab:disabled {
  opacity: 0.42;
  cursor: default;
}
.fab:active:not(:disabled) { transform: scale(0.98); }

.hud {
  position: absolute; left: 0; right: 0; bottom: calc(138px + var(--safe-b));
  pointer-events: none; text-align: center; z-index: 3;
}
.hint {
  display: inline-block;
  background: rgba(0,0,0,0.58);
  color: #d7dde8;
  font-size: 0.7rem;
  padding: 6px 12px;
  border-radius: 999px;
  opacity: 0.85;
  transition: opacity 0.6s;
}
.hint.hide { opacity: 0; }

.loading {
  position: absolute; inset: 0;
  display: grid; place-content: center; gap: 12px;
  background: rgba(6,8,11,0.72);
  -webkit-backdrop-filter: blur(3px);
  backdrop-filter: blur(3px);
  z-index: 6;
}
.loading[hidden] { display: none !important; }
.spinner {
  width: 36px; height: 36px; margin: 0 auto;
  border: 3px solid #272f3b; border-top-color: var(--accent);
  border-radius: 50%; animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading-text { text-align: center; color: var(--muted); font-size: 0.9rem; padding: 0 18px; }

.error-banner {
  position: absolute; inset: 0;
  display: grid; place-items: center;
  padding: 20px;
  background: rgba(6,8,11,0.82);
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
  z-index: 7;
}
.error-banner[hidden] { display: none !important; }
.error-card {
  max-width: 380px;
  width: 100%;
  background: #141820;
  border: 1px solid rgba(255, 122, 89, 0.45);
  border-radius: 18px;
  padding: 18px 20px;
  text-align: center;
  box-shadow: var(--shadow);
}
.error-card strong {
  display: block;
  font-size: 0.98rem;
  margin-bottom: 8px;
  color: #ffb49f;
}
.error-card p {
  margin: 0 0 14px;
  font-size: 0.84rem;
  line-height: 1.45;
  color: var(--ink);
  word-break: break-word;
}

.drawer {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  max-height: min(58vh, 520px);
  background: rgba(14,17,22,0.97);
  border-radius: var(--radius) var(--radius) 0 0;
  border-top: 1px solid var(--line);
  box-shadow: var(--shadow);
  padding: 0 16px calc(16px + var(--safe-b));
  transform: translateY(calc(100% - 68px));
  transition: transform 0.28s ease;
  z-index: 10;
  overflow: auto;
  -webkit-overflow-scrolling: touch;
}
.drawer.open { transform: translateY(0); }
.drawer-handle {
  width: 42px; height: 5px; border-radius: 999px;
  background: #3a4352; margin: 10px auto 8px;
  cursor: pointer;
}

.panel { margin: 10px 0 14px; }
.panel h2 {
  margin: 0 0 8px; font-size: 0.72rem; text-transform: uppercase;
  letter-spacing: 0.08em; color: var(--muted); font-weight: 600;
}
.parts-count {
  color: #6b7586;
  font-weight: 500;
}
.slider-row { display: flex; align-items: center; gap: 10px; }
.slider-row input[type="range"] {
  flex: 1; accent-color: var(--accent); height: 28px;
}
.val { font-variant-numeric: tabular-nums; font-size: 0.85rem; color: var(--muted); min-width: 2.6em; text-align: right; }
.step-meta { margin: 8px 0 0; font-size: 0.75rem; color: var(--muted); }

.tools { display: flex; flex-wrap: wrap; gap: 8px; }
.tools button, .parts-list button.toggle {
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--ink);
  border-radius: 999px;
  padding: 8px 14px;
  font: inherit;
  font-size: 0.82rem;
  cursor: pointer;
}
.tools button[aria-pressed="true"] {
  background: rgba(255,122,89,0.16);
  border-color: rgba(255,122,89,0.45);
  color: #ffb49f;
}
.tools button:disabled { opacity: 0.4; cursor: default; }

.parts-head { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; }
.parts-actions { display: flex; gap: 10px; }
.linkish {
  border: 0; background: none; color: var(--accent-2);
  font: inherit; font-size: 0.78rem; cursor: pointer; padding: 0;
}

.parts-list {
  list-style: none; margin: 0; padding: 0;
  display: flex; flex-direction: column; gap: 4px;
}
.parts-list li {
  display: grid;
  grid-template-columns: 28px 1fr auto;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border-radius: 12px;
  border: 1px solid transparent;
  cursor: pointer;
}
.parts-list li:hover { background: rgba(255,255,255,0.04); }
.parts-list li.active {
  background: rgba(255,122,89,0.12);
  border-color: rgba(255,122,89,0.35);
}
.parts-list li.dim { opacity: 0.4; }
.parts-list li.removed { opacity: 0.28; text-decoration: line-through; }
.swatch {
  width: 18px; height: 18px; border-radius: 6px;
  border: 1px solid rgba(255,255,255,0.16);
}
.part-label { font-size: 0.86rem; }
.parts-list .toggle { padding: 4px 10px; font-size: 0.72rem; }

.footnote {
  font-size: 0.72rem; color: var(--muted); line-height: 1.35;
  margin: 4px 0 8px;
}

@media (min-width: 860px) {
  #app {
    grid-template-columns: 1fr 360px;
    grid-template-rows: auto 1fr;
  }
  .topbar { grid-column: 1 / -1; }
  #viewport { grid-column: 1; }
  .drawer {
    position: relative;
    grid-column: 2;
    grid-row: 2;
    max-height: none;
    height: 100%;
    transform: none !important;
    border-radius: 0;
    border-left: 1px solid var(--line);
    border-top: 0;
    box-shadow: none;
    padding: 16px 18px calc(16px + var(--safe-b));
    background: #0c0f14;
  }
  .drawer-handle, #partsToggle { display: none; }
  .fab-bar { bottom: 28px; }
  .hud { bottom: 88px; }
  .part-card { left: 20px; right: auto; }
  .model-menu {
    right: 14px;
    left: auto;
    width: 420px;
  }
}