/* ── Design tokens ─────────────────────────────────────────────────── */
:root{
  --bg-0:#08090b;--bg-1:#0d0e11;--bg-2:#141519;--bg-3:#1b1c21;--bg-4:#232429;
  --border:rgba(255,255,255,0.08);--border-h:rgba(255,255,255,0.16);
  --accent:#e8a33d;--accent-dim:rgba(232,163,61,0.12);--accent-line:rgba(232,163,61,0.35);
  --text-0:#f4f4f5;--text-1:#a3a3ab;--text-2:#6b6c76;--text-3:#47484f;
  --red:#e5484d;--green:#3ecf8e;--blue:#5b9dfa;
  --font-ui:'Inter',system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --font-mono:'JetBrains Mono','SF Mono',ui-monospace,monospace;
  --r-sm:6px;--r-md:10px;--r-lg:14px;
}

/* ── Reset & base ──────────────────────────────────────────────────── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;font-family:var(--font-ui);
  -webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
body,html{width:100%;height:100%;overflow:hidden;background-color:var(--bg-0);color:var(--text-0);
  font-size:15px;line-height:1.5}

/* ── Canvas ────────────────────────────────────────────────────────── */
#canvas-container{position:absolute;top:0;left:0;width:100%;height:100%;z-index:1;touch-action:none}
#canvas-container canvas{touch-action:none}

/* ── UI overlay grid ───────────────────────────────────────────────── */
#ui-container{position:absolute;top:0;left:0;width:100%;height:100%;z-index:10;
  pointer-events:none; /* let clicks/touches pass through to the canvas by default */
  display:grid;grid-template-columns:296px 1fr 320px;grid-template-rows:60px 1fr 36px;
  grid-template-areas:"header header header" "left . right" "footer footer footer";
  padding:14px;gap:14px}

.panel{pointer-events:auto;background:var(--bg-1);border:1px solid var(--border);
  border-radius:var(--r-lg);box-shadow:0 12px 32px -8px rgba(0,0,0,0.5);
  transition:border-color .15s ease}

/* ── Header ────────────────────────────────────────────────────────── */
.main-header{grid-area:header;display:flex;justify-content:space-between;align-items:center;
  padding:0 18px;height:100%}
.logo{display:flex;align-items:center;gap:9px;font-weight:700;font-size:1rem;
  letter-spacing:-0.01em;color:var(--text-0)}
.logo-icon{color:var(--accent);flex-shrink:0}
.accent-text{color:var(--accent)}
.package-links{display:flex;gap:18px;align-items:center}
.nav-link{color:var(--text-1);text-decoration:none;font-weight:500;font-size:0.84rem;
  transition:color .15s ease}
.nav-link:hover{color:var(--text-0)}
.actions{display:flex;gap:10px}

/* ── Buttons ───────────────────────────────────────────────────────── */
.btn{display:inline-flex;align-items:center;gap:7px;padding:8px 16px;font-size:0.84rem;
  font-weight:600;border-radius:var(--r-sm);border:1px solid transparent;cursor:pointer;
  transition:all .15s ease;font-family:var(--font-ui)}
.btn-icon{flex-shrink:0}
.btn-primary{background:var(--accent);color:#1a1005}
.btn-primary:hover{filter:brightness(1.08)}
.btn-primary:active{filter:brightness(0.94)}
.btn-secondary{background:var(--bg-3);color:var(--text-0);border-color:var(--border)}
.btn-secondary:not(:disabled):hover{background:var(--bg-4);border-color:var(--border-h)}
.btn-secondary:disabled{opacity:.35;cursor:not-allowed}
.btn-icon-only{padding:8px;display:inline-flex;align-items:center;justify-content:center}

/* ── Sidebars ──────────────────────────────────────────────────────── */
.sidebar-left{grid-area:left;display:flex;flex-direction:column;overflow:hidden;
  max-height:calc(100vh - 124px)}
.sidebar-right{grid-area:right;display:flex;flex-direction:column;overflow:hidden;
  max-height:calc(100vh - 124px)}

.panel-header{padding:14px 18px;border-bottom:1px solid var(--border);
  display:flex;justify-content:space-between;align-items:center;flex-shrink:0;gap:10px}
.panel-header h3{font-size:0.78rem;font-weight:700;color:var(--text-1);
  letter-spacing:0.06em;text-transform:uppercase}
.panel-header-right{display:flex;align-items:center;gap:8px}
.panel-close{display:none;background:none;border:none;color:var(--text-2);cursor:pointer;
  padding:4px;line-height:0}

/* ── Export Dropdown ────────────────────────────────────────────────── */
.dropdown{position:relative;display:inline-block}
.dropdown-toggle{display:flex;align-items:center;gap:6px}
.btn-arrow{transition:transform 0.2s ease}
.dropdown.active .btn-arrow{transform:rotate(180deg)}

.dropdown-menu{position:absolute;top:calc(100% + 8px);right:0;width:310px;
  background:rgba(18,20,26,0.96);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  border:1px solid var(--border-h);border-radius:var(--r);padding:6px;
  box-shadow:0 12px 32px rgba(0,0,0,0.5);display:none;flex-direction:column;gap:3px;z-index:100;
  animation:dropdownFade 0.2s ease}
.dropdown.active .dropdown-menu{display:flex}

@keyframes dropdownFade {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

.dropdown-item{display:flex;align-items:center;gap:10px;padding:9px 12px;
  background:transparent;border:none;border-radius:var(--r-sm);color:var(--text-0);
  cursor:pointer;text-align:left;transition:all 0.15s ease;width:100%}
.dropdown-item:hover{background:var(--bg-3);border-color:var(--accent-line)}
.fmt-icon{font-size:1.1rem;flex-shrink:0}
.fmt-info{display:flex;flex-direction:column;gap:2px}
.fmt-title{font-size:0.83rem;font-weight:600;color:var(--text-0)}
.fmt-desc{font-size:0.7rem;color:var(--text-2)}

.badge{background:var(--accent-dim);color:var(--accent);font-size:0.72rem;font-weight:700;
  padding:2px 9px;border-radius:20px;border:1px solid var(--accent-line)}

.panel-content{flex-grow:1;padding:14px 18px}
.scrollable{overflow-y:auto;overflow-x:hidden}
.scrollable::-webkit-scrollbar{width:6px}
.scrollable::-webkit-scrollbar-track{background:transparent}
.scrollable::-webkit-scrollbar-thumb{background:var(--bg-4);border-radius:10px}
.scrollable::-webkit-scrollbar-thumb:hover{background:var(--border-h)}

/* ── Empty states ──────────────────────────────────────────────────── */
.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;
  text-align:center;height:100%;color:var(--text-2);gap:10px;padding:36px 0}
.empty-icon{stroke:var(--text-3)}

/* ── Layers list ───────────────────────────────────────────────────── */
#layers-list{list-style:none;display:flex;flex-direction:column;gap:6px}
.layer-item{display:flex;align-items:center;justify-content:space-between;padding:9px 11px;
  border-radius:var(--r-sm);background:var(--bg-2);border:1px solid transparent;transition:all .15s ease}
.layer-item:hover{border-color:var(--border)}
.layer-left{display:flex;align-items:center;gap:9px;flex-grow:1;min-width:0}
.layer-color-pill{width:11px;height:11px;border-radius:50%;flex-shrink:0;
  border:1px solid rgba(255,255,255,0.15)}
.layer-name{font-size:0.84rem;color:var(--text-0);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

.switch{position:relative;display:inline-block;width:30px;height:17px;flex-shrink:0}
.switch input{opacity:0;width:0;height:0}
.slider{position:absolute;cursor:pointer;top:0;left:0;right:0;bottom:0;
  background-color:var(--bg-4);transition:.2s;border-radius:34px}
.slider:before{position:absolute;content:"";height:13px;width:13px;left:2px;bottom:2px;
  background-color:#fff;transition:.2s;border-radius:50%}
input:checked + .slider{background-color:var(--accent)}
input:checked + .slider:before{transform:translateX(13px)}

/* ── Inspector ─────────────────────────────────────────────────────── */
.inspector-section{margin-bottom:20px}
.inspector-section h4{font-size:0.7rem;font-weight:700;letter-spacing:0.06em;text-transform:uppercase;
  color:var(--text-2);margin-bottom:10px}
.property-table{width:100%;border-collapse:collapse}
.property-table tr{border-bottom:1px solid var(--border)}
.property-table tr:last-child{border-bottom:none}
.property-table td{padding:7px 0;font-size:0.82rem}
.property-table td:first-child{color:var(--text-2);font-weight:500;width:38%}
.property-table td:last-child{color:var(--text-0);word-break:break-all}
.selectable-text{user-select:text;-webkit-user-select:text}

.coordinates-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.coordinates-grid > div{background:var(--bg-2);border:1px solid var(--border);border-radius:var(--r-sm);
  padding:8px 6px;display:flex;flex-direction:column;align-items:center;gap:3px}
.coord-label{font-size:0.66rem;font-weight:700;color:var(--text-2)}
.coord-value{font-size:0.82rem;font-weight:600;color:var(--text-0);font-family:var(--font-mono);
  user-select:text;-webkit-user-select:text}

/* ── Status bar ────────────────────────────────────────────────────── */
.status-bar{grid-area:footer;display:flex;justify-content:space-between;align-items:center;
  padding:0 16px;font-size:0.72rem;color:var(--text-2);height:100%}
.status-left{display:flex;align-items:center;gap:8px;min-width:0;overflow:hidden;
  text-overflow:ellipsis;white-space:nowrap}
.status-right{display:flex;gap:10px;flex-shrink:0}
.stat-item{background:var(--bg-2);padding:2px 8px;border-radius:4px;border:1px solid var(--border);
  font-family:var(--font-mono)}

/* ── Full-screen modal overlays (drop / loading / size-warning) ──────── */
#drop-overlay,#loading-overlay,#size-warning-overlay{
  position:absolute;top:0;left:0;width:100%;height:100%;
  background:rgba(4,5,6,0.88);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
  display:flex;align-items:center;justify-content:center;transition:opacity .2s ease}
#drop-overlay{z-index:100;opacity:0;pointer-events:none}
#drop-overlay.active{opacity:1;pointer-events:auto}
#loading-overlay{z-index:200}
#loading-overlay.hidden{opacity:0;pointer-events:none}
#size-warning-overlay{z-index:300}
#size-warning-overlay.hidden{opacity:0;pointer-events:none}

.drop-overlay-content{border:1px solid var(--border);background:var(--bg-1);border-radius:var(--r-lg);
  padding:52px 64px;display:flex;flex-direction:column;align-items:center;gap:14px;
  text-align:center;max-width:520px}
.drop-icon{color:var(--accent)}
#drop-overlay h2{font-size:1.3rem;font-weight:700;color:var(--text-0)}
#drop-overlay p{font-size:0.86rem;color:var(--text-2)}

.spinner-container{display:flex;flex-direction:column;align-items:center;gap:14px;color:var(--text-0)}
.spinner{width:40px;height:40px;border:3px solid var(--bg-4);border-radius:50%;
  border-top-color:var(--accent);animation:spin 0.9s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
#loading-text{font-size:0.86rem;font-weight:500;color:var(--text-1)}

.size-warning-content{border:1px solid rgba(229,72,77,0.3);background:var(--bg-1);border-radius:var(--r-lg);
  padding:40px 36px;display:flex;flex-direction:column;align-items:center;gap:11px;
  text-align:center;max-width:480px}
.size-warning-icon{color:var(--red)}
.size-warning-content h2{font-size:1.15rem;font-weight:700;color:var(--text-0)}
.size-warning-content p{font-size:0.86rem;color:var(--text-1);line-height:1.55}
.size-warning-note{color:var(--text-2)!important;font-size:0.8rem!important}
.size-warning-note a{color:var(--accent)}
.size-warning-actions{display:flex;gap:10px;margin-top:8px}

/* ── Mobile panel toggle buttons (hidden on desktop) ──────────────── */
.mobile-toggles{display:none}

/* ═══════════════════════════════════════════════════════════════════
   Responsive: tablet
   ═══════════════════════════════════════════════════════════════════ */
@media (max-width:1024px) and (min-width:769px){
  #ui-container{grid-template-columns:260px 1fr 280px}
}

/* ═══════════════════════════════════════════════════════════════════
   Responsive: phone — canvas stays full-screen & interactive at all
   times; Layers/Inspector become dismissible drawers instead of
   competing with the 3D view for space.
   ═══════════════════════════════════════════════════════════════════ */
@media (max-width:768px){
  body,html{font-size:16px}

  #ui-container{
    grid-template-columns:1fr;grid-template-rows:56px 1fr auto;
    grid-template-areas:"header" "." "footer";
    padding:10px;gap:10px;
    pointer-events:none; /* stays pass-through: only real panels opt in */
  }

  .main-header{padding:0 12px}
  .logo span:not(.accent-text){display:none}
  .package-links{display:none}
  .actions{gap:8px}
  .actions .btn span{display:none}
  .btn{padding:9px 11px}

  /* Sidebars become full-screen dismissible drawers, closed by default */
  .sidebar-left,.sidebar-right{
    grid-area:unset;position:fixed;left:10px;right:10px;bottom:64px;top:auto;
    max-height:70vh;z-index:50;
    transform:translateY(16px);opacity:0;pointer-events:none;
    transition:transform .2s ease,opacity .2s ease;
  }
  .sidebar-left.open,.sidebar-right.open{
    transform:translateY(0);opacity:1;pointer-events:auto;
  }
  .panel-close{display:inline-flex}

  .status-bar{grid-area:footer;font-size:0.7rem;padding:0 12px;
    background:var(--bg-1);border:1px solid var(--border);border-radius:var(--r-lg)}
  .status-right{display:none}

  .mobile-toggles{display:flex;position:fixed;left:10px;bottom:10px;z-index:40;
    gap:8px;pointer-events:auto}
  .mtoggle{display:flex;align-items:center;gap:6px;padding:9px 13px;border-radius:20px;
    background:var(--bg-1);border:1px solid var(--border);color:var(--text-1);
    font-size:0.78rem;font-weight:600;cursor:pointer}
  .mtoggle.active{color:var(--accent);border-color:var(--accent-line);background:var(--accent-dim)}
  .mtoggle .mcount{background:var(--bg-3);border-radius:20px;padding:1px 7px;font-size:0.7rem}

  .drop-overlay-content{padding:36px 28px;max-width:88vw}
  .size-warning-content{padding:30px 22px;max-width:90vw}
}