/* ── Layout ────────────────────────────────────────────────────────
   Reset, body background, nav bar, grid systems for dashboard/chat.
   ────────────────────────────────────────────────────────────────── */

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  color: var(--text-primary);
  background: var(--bg-void);
  /* Subtle radial gradient accents */
  background-image:
    radial-gradient(ellipse 80% 60% at 20% 10%, rgba(59, 130, 246, 0.06) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 80% 90%, rgba(139, 92, 246, 0.05) 0%, transparent 60%);
  min-height: 100vh;
  overflow-x: hidden;
}

/* ── Nav Bar ─────────────────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 100;
  display: flex;
  align-items: center;
  padding: 0 var(--sp-6);
  gap: var(--sp-4);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--glass-highlight);
}

.nav__brand {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text-accent);
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.nav__tabs {
  display: flex;
  gap: var(--sp-1);
  margin-left: var(--sp-4);
}

.nav__tab {
  padding: var(--sp-2) var(--sp-4);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.nav__tab:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.04);
}

.nav__tab--active {
  color: var(--text-accent);
  background: rgba(59, 130, 246, 0.1);
  border-color: rgba(59, 130, 246, 0.25);
}

.nav__spacer {
  flex: 1;
}

/* ── Main Content ────────────────────────────────────────────────── */
.main {
  padding-top: var(--nav-height);
  min-height: 100vh;
}

.view {
  display: none;
  padding: var(--sp-6);
  animation: fadeIn 200ms ease;
}

.view--active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── Dashboard Grid ──────────────────────────────────────────────── */
.dashboard-grid {
  display: grid;
  grid-template-columns: minmax(280px, 1fr) minmax(420px, 1.4fr);
  grid-template-rows: auto auto 1fr;
  gap: var(--sp-4);
  height: calc(100vh - var(--nav-height) - var(--sp-6) * 2);
}

.dashboard-grid__controls {
  grid-column: 1 / -1;
}

.dashboard-grid__narrative {
  grid-column: 1 / -1;
}

.dashboard-grid__graph {
  grid-column: 1;
  grid-row: 3;
  min-height: 0;
}

.dashboard-grid__sidebar {
  grid-column: 2;
  grid-row: 3;
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
  min-height: 0;
}

/* ── Chat Grid ───────────────────────────────────────────────────── */
.chat-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 0;
  height: calc(100vh - var(--nav-height));
}

/* ── Responsive ──────────────────────────────────────────────────── */
@media (max-width: 1200px) {
  .dashboard-grid {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto auto auto;
    height: auto;
  }
  .dashboard-grid__sidebar {
    grid-column: 1;
    grid-row: 4;
  }
}

@media (max-width: 768px) {
  .chat-layout {
    grid-template-columns: 1fr;
  }
  .chat-sidebar {
    display: none;
  }
  .nav {
    padding: 0 var(--sp-3);
    gap: var(--sp-2);
  }
  .nav__brand {
    font-size: var(--text-base);
  }
  .nav__tabs {
    overflow-x: auto;
    flex-wrap: nowrap;
    -ms-overflow-style: none;
    scrollbar-width: none;
    margin-left: var(--sp-2);
  }
  .nav__tabs::-webkit-scrollbar { display: none; }
  .nav__tab {
    white-space: nowrap;
    flex-shrink: 0;
  }
  #roleSelect {
    flex-shrink: 1;
    min-width: 80px;
  }
  .controls {
    flex-wrap: wrap;
    gap: var(--sp-2);
  }
}