/* ─────────────────────────────────────────────
   VARIABLES & RESET
───────────────────────────────────────────── */
:root {
  --bg:          #0a0d14;
  --surface:     #111520;
  --surface-2:   #161c2e;
  --border:      rgba(255,255,255,0.07);
  --border-hi:   rgba(255,255,255,0.14);
  --text:        #e2e8f0;
  --text-muted:  #64748b;
  --text-dim:    #94a3b8;
  --accent:      #38bdf8;
  --accent-dim:  rgba(56,189,248,0.15);
  --accent-glow: rgba(56,189,248,0.3);
  --green:       #22c55e;
  --sidebar-w:   270px;
  --topbar-h:    54px;
  --radius:      10px;
  --font-mono:   'Space Mono', monospace;
  --font-body:   'DM Sans', sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
}

button { font-family: inherit; cursor: pointer; }

/* ─────────────────────────────────────────────
   LAYOUT ROOT — desktop: sidebar + main side by side
───────────────────────────────────────────── */
body {
  display: flex;
  height: 100dvh; /* dynamic viewport height — fixes mobile browser chrome */
}

/* ─────────────────────────────────────────────
   SIDEBAR
───────────────────────────────────────────── */
.sidebar {
  width: var(--sidebar-w);
  min-width: var(--sidebar-w);
  height: 100dvh;
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
  transition: transform 0.28s cubic-bezier(.4,0,.2,1);
  z-index: 200;
  flex-shrink: 0;
}

.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-thumb { background: var(--border-hi); border-radius: 4px; }

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 20px 18px 16px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.sidebar-brand {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.12em;
  color: var(--text);
}

.dot { color: var(--accent); }

.sidebar-section {
  padding: 18px 16px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.sidebar-label {
  font-family: var(--font-mono);
  font-size: 0.67rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 12px;
}

/* ── Animation Controls ── */
.anim-controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 7px;
  margin-bottom: 14px;
}

.ctrl-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  padding: 10px 8px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-dim);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  transition: all 0.18s;
  -webkit-tap-highlight-color: transparent;
}

.ctrl-btn:hover, .ctrl-btn:active {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
}

/* ── Step Nav ── */
.step-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 8px 10px;
}

.nav-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  min-width: 32px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 7px;
  color: var(--text-dim);
  transition: all 0.18s;
  flex-shrink: 0;
  -webkit-tap-highlight-color: transparent;
}

.nav-btn:hover, .nav-btn:active {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
}

.step-info {
  flex: 1;
  text-align: center;
  overflow: hidden;
}

.step-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  color: var(--accent);
  letter-spacing: 0.1em;
  margin-bottom: 2px;
}

.step-name {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.step-desc {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.45;
  margin-bottom: 14px;
  min-height: 2.2em;
}

.play-row {
  display: flex;
  gap: 7px;
}

.play-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 12px;
  background: var(--accent);
  border: none;
  border-radius: var(--radius);
  color: #0a0d14;
  font-weight: 700;
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  transition: all 0.18s;
  -webkit-tap-highlight-color: transparent;
}

.play-btn:hover { filter: brightness(1.12); }
.play-btn:active { transform: scale(0.97); }

.play-btn.ghost {
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text-dim);
  filter: none;
}

.play-btn.ghost:hover, .play-btn.ghost:active {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
  filter: none;
}

/* ── Mode Group ── */
.mode-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.mode-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-dim);
  font-size: 0.82rem;
  font-weight: 500;
  text-align: left;
  transition: all 0.18s;
  -webkit-tap-highlight-color: transparent;
}

.mode-btn:hover { border-color: var(--border-hi); color: var(--text); }
.mode-btn.active { border-color: var(--accent); background: var(--accent-dim); color: var(--accent); }

.mode-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,0.15);
  flex-shrink: 0;
}

/* ── Parts ── */
.sidebar-parts {
  flex: 1;
  border-bottom: none;
  min-height: 0;
}

.parts-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.parts-toggle { display: flex; gap: 5px; }

.toggle-btn {
  padding: 4px 9px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-dim);
  font-size: 0.7rem;
  font-weight: 600;
  transition: all 0.15s;
  -webkit-tap-highlight-color: transparent;
}

.toggle-btn:hover, .toggle-btn:active {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
}

.parts-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  overflow-y: auto;
  max-height: 280px;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.part-row {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 8px 8px;
  border-radius: 8px;
  transition: background 0.15s;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.part-row:hover { background: var(--surface-2); }

.part-row input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
  cursor: pointer;
  flex-shrink: 0;
}

.swatch {
  width: 12px;
  height: 12px;
  border-radius: 3px;
  flex-shrink: 0;
  border: 1px solid rgba(255,255,255,0.15);
}

.part-name {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 400;
  flex: 1;
}

.part-row:has(input:checked) .part-name { color: var(--text); }

/* ─────────────────────────────────────────────
   MAIN AREA
───────────────────────────────────────────── */
.main-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
}

/* ── Top Bar ── */
.topbar {
  height: var(--topbar-h);
  min-height: var(--topbar-h);
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 0 18px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  z-index: 10;
}

.sidebar-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-dim);
  transition: all 0.18s;
  flex-shrink: 0;
  -webkit-tap-highlight-color: transparent;
}

.sidebar-toggle:hover, .sidebar-toggle:active {
  border-color: var(--accent);
  color: var(--accent);
}

.topbar-title { flex: 1; min-width: 0; }

.topbar-project {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--text-muted);
  margin-bottom: 1px;
}

.topbar-title h1 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.status-badge {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 5px 11px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.72rem;
  color: var(--text-dim);
  white-space: nowrap;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
  flex-shrink: 0;
}

.status-dot.loading {
  background: #f59e0b;
  animation: pulse-dot 1.2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.view-controls { display: flex; gap: 4px; }

.view-btn {
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 7px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  transition: all 0.15s;
  -webkit-tap-highlight-color: transparent;
}

.view-btn:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-dim); }
.view-btn.active { background: var(--accent); border-color: var(--accent); color: #0a0d14; }

/* ─────────────────────────────────────────────
   VIEWER
───────────────────────────────────────────── */
.viewer-wrap {
  flex: 1;
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(ellipse 80% 60% at 60% 40%, rgba(56,189,248,0.05), transparent 65%),
    radial-gradient(ellipse 50% 50% at 20% 80%, rgba(99,102,241,0.04), transparent 55%),
    var(--bg);
}

#viewer {
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none; /* important for Three.js touch events */
}

.hud-bottom-left {
  position: absolute;
  bottom: 16px;
  left: 16px;
  display: flex;
  gap: 7px;
  flex-wrap: wrap;
  pointer-events: none;
}

.hud-pill {
  padding: 5px 10px;
  background: rgba(10,13,20,0.75);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.68rem;
  color: var(--text-muted);
  backdrop-filter: blur(8px);
  font-family: var(--font-mono);
}

.hud-bottom-right {
  position: absolute;
  bottom: 16px;
  right: 16px;
  pointer-events: none;
}

.axis-indicator {
  display: flex;
  gap: 8px;
  padding: 6px 10px;
  background: rgba(10,13,20,0.75);
  border: 1px solid var(--border);
  border-radius: 8px;
  backdrop-filter: blur(8px);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.72rem;
  letter-spacing: 0.06em;
}

/* ─────────────────────────────────────────────
   LOADING
───────────────────────────────────────────── */
.loading-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  background: var(--bg);
  z-index: 50;
  transition: opacity 0.6s ease, visibility 0.6s ease;
  padding: 20px;
  text-align: center;
}

.loading-overlay.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.loading-text {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--accent);
  letter-spacing: 0.06em;
}

.loading-sub {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.6;
  max-width: 340px;
}

.loading-sub code {
  display: inline-block;
  margin-top: 6px;
  padding: 4px 10px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
}

/* ─────────────────────────────────────────────
   PROGRESS BAR
───────────────────────────────────────────── */
.progress-bar {
  position: fixed;
  top: 0; left: 0;
  height: 2px;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent-glow);
  transition: width 0.3s ease;
  z-index: 999;
}

/* ─────────────────────────────────────────────
   MOBILE BOTTOM CONTROLS — aparece solo en móvil
───────────────────────────────────────────── */
.mobile-controls {
  display: none;
}

/* ─────────────────────────────────────────────
   SIDEBAR OVERLAY (móvil)
───────────────────────────────────────────── */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  z-index: 190;
  backdrop-filter: blur(2px);
}

.sidebar-overlay.active { display: block; }

/* ─────────────────────────────────────────────
   RESPONSIVE — TABLET (≤900px)
───────────────────────────────────────────── */
@media (max-width: 900px) {
  .sidebar {
    position: fixed;
    top: 0; left: 0;
    height: 100dvh;
    transform: translateX(-100%);
    box-shadow: 4px 0 40px rgba(0,0,0,0.6);
  }

  .sidebar.open { transform: translateX(0); }

  .sidebar-toggle { display: flex; }

  .view-controls { display: none; }

  .hud-bottom-left { display: none; }
}

/* ─────────────────────────────────────────────
   RESPONSIVE — MOBILE (≤600px)
───────────────────────────────────────────── */
@media (max-width: 600px) {

  :root { --topbar-h: 50px; }

  /* Ocultar status badge en topbar */
  .topbar-right .status-badge { display: none; }

  /* El viewer ocupa casi toda la pantalla menos topbar y controles bottom */
  body { flex-direction: column; overflow: hidden; }

  .main-area { height: 100dvh; }

  .viewer-wrap {
    flex: 1;
    min-height: 0;
  }

  /* Controles inferiores móvil */
  .mobile-controls {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    background: var(--surface);
    border-top: 1px solid var(--border);
    flex-shrink: 0;
    overflow-x: auto;
    scrollbar-width: none;
  }

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

  .mob-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    padding: 8px 12px;
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--text-dim);
    font-size: 0.65rem;
    font-weight: 600;
    white-space: nowrap;
    flex-shrink: 0;
    -webkit-tap-highlight-color: transparent;
    transition: all 0.15s;
  }

  .mob-btn:active, .mob-btn.primary {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-dim);
  }

  .mob-btn.primary {
    background: var(--accent);
    color: #0a0d14;
    border-color: var(--accent);
  }

  .mob-btn svg { width: 18px; height: 18px; }

  .mob-divider {
    width: 1px;
    height: 28px;
    background: var(--border);
    flex-shrink: 0;
  }

  /* Step info en topbar móvil */
  .topbar-title h1 { font-size: 0.82rem; }
  .topbar-project { display: none; }

  /* Ocultar HUD */
  .hud-bottom-right { display: none; }
}

/* ── Mobile color toggle button ── */
.mob-color-toggle {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 8px 14px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text-muted);
  font-size: 0.65rem;
  font-weight: 700;
  white-space: nowrap;
  flex-shrink: 0;
  -webkit-tap-highlight-color: transparent;
  transition: all 0.15s;
  letter-spacing: 0.04em;
}

.mob-color-toggle.active {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
}

.mob-color-pip {
  width: 22px;
  height: 10px;
  border-radius: 5px;
  border: 1px solid rgba(255,255,255,0.15);
  display: block;
}