/* NEURAVID — design tokens */
:root {
  /* Brand */
  --neon:  #00D9FF;
  --jade:  #10B981;
  --pulse: #9333EA;
  --gold:  #FBBF24;
  --solar: #F97316;
  --rose:  #F43F5E;

  /* Neutrals */
  --void-bg:    #0F0F0F;
  --obsidian:   #1A1A2E;
  --slate:      #1E293B;
  --gray-400:   #9CA3AF;
  --gray-500:   #6B7280;
  --gray-700:   #374151;
  --white:      #FFFFFF;

  /* Gradients */
  --neon-glow-gradient:    linear-gradient(135deg, #00D9FF, #9333EA);
  --gold-premium-gradient: linear-gradient(135deg, #FBBF24, #F97316);

  /* Radii & fonts */
  --radius: 12px;
  --font: -apple-system, "Segoe UI", Roboto, Inter, sans-serif;

  /* Layout */
  --topbar-h: 60px;
  --sidebar-w: 260px;
}

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

html, body {
  height: 100%;
  background: var(--void-bg);
  color: var(--white);
  font-family: var(--font);
  overflow: hidden;
}

/* ── Topbar ──────────────────────────── */
#topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--topbar-h);
  background: var(--obsidian);
  border-bottom: 1px solid rgba(0,217,255,0.15);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  z-index: 1000;
}

#topbar .brand {
  font-size: 1.25rem;
  font-weight: 800;
  background: var(--neon-glow-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 0.5px;
}

#topbar .module-title {
  margin-left: 12px;
  font-size: 0.95rem;
  color: var(--gray-400);
  font-weight: 500;
}

#topbar .topbar-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

#topbar .actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

#topbar .hvs-readout {
  font-size: 0.8rem;
  color: var(--gray-400);
  background: var(--slate);
  padding: 4px 10px;
  border-radius: 20px;
  border: 1px solid rgba(0,217,255,0.1);
}

#topbar .hvs-readout span { color: var(--neon); font-weight: 600; }

#topbar button.icon-btn {
  width: 36px; height: 36px;
  border-radius: 8px;
  border: 1px solid rgba(0,217,255,0.2);
  background: var(--slate);
  color: var(--gray-400);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}

#topbar button.icon-btn:hover {
  border-color: var(--neon);
  color: var(--neon);
}

#hamburger { display: none; }

/* ── Sidebar ─────────────────────────── */
#sidebar {
  position: fixed;
  top: var(--topbar-h); left: 0; bottom: 0;
  width: var(--sidebar-w);
  background: var(--obsidian);
  border-right: 1px solid rgba(0,217,255,0.1);
  display: flex;
  flex-direction: column;
  z-index: 900;
  transition: transform 0.3s ease;
}

#sidebar .sidebar-header {
  background: var(--neon-glow-gradient);
  padding: 16px;
  flex-shrink: 0;
}

#sidebar .sidebar-header .logo {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--white);
}

#sidebar .sidebar-header .subtitle {
  font-size: 0.75rem;
  color: rgba(255,255,255,0.8);
  margin-top: 2px;
}

#sidebar .sidebar-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px 0;
}

#sidebar .category-label {
  padding: 8px 16px 4px;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--gray-500);
  font-weight: 600;
}

#sidebar a.module-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 16px;
  color: var(--gray-400);
  text-decoration: none;
  font-size: 0.85rem;
  transition: all 0.15s;
  border-left: 3px solid transparent;
  position: relative;
}

#sidebar a.module-link:hover {
  background: rgba(255,255,255,0.04);
  color: var(--white);
}

#sidebar a.module-link.active {
  border-left-color: var(--link-color, var(--neon));
  background: rgba(0,217,255,0.08);
  color: var(--white);
}

#sidebar a.module-link .icon-badge {
  width: 28px; height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  flex-shrink: 0;
}

#sidebar a.module-link .chevron {
  margin-left: auto;
  opacity: 0.3;
  font-size: 0.7rem;
}

#sidebar .sidebar-footer {
  padding: 10px 16px;
  font-size: 0.7rem;
  color: var(--gray-500);
  border-top: 1px solid rgba(0,217,255,0.08);
  flex-shrink: 0;
}

/* ── Content / iframe ────────────────── */
#content {
  position: fixed;
  top: var(--topbar-h);
  left: var(--sidebar-w);
  right: 0; bottom: 0;
  background: var(--void-bg);
}

#moduleFrame {
  width: 100%; height: 100%;
  border: none;
  display: block;
}

/* ── Loading spinner ─────────────────── */
#loader {
  position: fixed;
  top: var(--topbar-h); left: var(--sidebar-w); right: 0; bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--void-bg);
  z-index: 800;
  transition: opacity 0.3s;
}

#loader.hidden { opacity: 0; pointer-events: none; }

.spinner {
  width: 40px; height: 40px;
  border-radius: 50%;
  border: 3px solid rgba(0,217,255,0.2);
  border-top-color: var(--neon);
  animation: spin 0.8s linear infinite;
}

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

/* ── Placeholder (missing module) ────── */
#placeholder {
  display: none;
  position: fixed;
  top: var(--topbar-h); left: var(--sidebar-w); right: 0; bottom: 0;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 12px;
  color: var(--gray-500);
  background: var(--void-bg);
  z-index: 700;
}

#placeholder.visible { display: flex; }

#placeholder .icon { font-size: 3rem; }
#placeholder h2 { font-size: 1.1rem; color: var(--gray-400); }
#placeholder p { font-size: 0.85rem; }

/* ── Overlay (mobile) ────────────────── */
#sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 850;
}

/* ── Responsive ───────────────────────── */
@media (max-width: 900px) {
  #sidebar {
    transform: translateX(-100%);
    box-shadow: 4px 0 20px rgba(0,0,0,0.5);
  }
  #sidebar.open { transform: translateX(0); }
  #sidebar-overlay.visible { display: block; }
  #content { left: 0; }
  #hamburger { display: flex; }
  #loader { left: 0; }
}

/* ── Scrollbar ────────────────────────── */
#sidebar .sidebar-list::-webkit-scrollbar { width: 6px; }
#sidebar .sidebar-list::-webkit-scrollbar-thumb {
  background: rgba(0,217,255,0.15);
  border-radius: 3px;
}