/* Layout — sidebar + topbar + page content. Apple-style: glass surfaces,
   light borders, generous spacing. The sidebar is a vertical glass panel
   that lets the app background bleed through; topbar mirrors the same
   blur on a thinner surface. */

.app { display: flex; min-height: 100vh; }

/* === Sidebar === */
.sidebar {
  position: fixed; top: 0; left: 0; bottom: 0;
  width: var(--sidebar-width);
  background: var(--bg-sidebar);
  -webkit-backdrop-filter: var(--glass-blur-lg);
  backdrop-filter: var(--glass-blur-lg);
  border-right: 1px solid var(--border-subtle);
  display: flex; flex-direction: column;
  z-index: var(--z-sidebar);
  transition: transform var(--duration-slow) var(--ease-emph),
              background var(--duration-base) var(--ease-standard);
}

.sidebar-header {
  padding: var(--space-5) var(--space-5) var(--space-4);
  display: flex; align-items: center; gap: 10px;
}

/* Logo: smaller (28px instead of 36) and without the accent glow shadow.
   The brand is the wordmark next to it; the logo is supporting, not loud. */
.sidebar-logo {
  width: 28px; height: 28px;
  background: var(--accent);
  border-radius: 7px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  color: white;
}
.sidebar-logo svg { width: 16px; height: 16px; stroke-width: 1.7; }

.sidebar-brand { display: flex; flex-direction: column; gap: 1px; min-width: 0; }
.sidebar-title {
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  color: var(--text-primary);
  letter-spacing: -0.01em;
  line-height: 1.2;
}
.sidebar-subtitle {
  font-size: 11px; color: var(--text-tertiary);
  font-weight: var(--weight-medium);
  line-height: 1.2;
}

.sidebar-nav {
  flex: 1;
  padding: var(--space-2) 10px var(--space-4);
  display: flex; flex-direction: column; gap: 1px;
  overflow-y: auto;
}

.nav-section-title {
  font-size: 10px;
  font-weight: var(--weight-semibold);
  color: var(--text-tertiary);
  text-transform: uppercase; letter-spacing: 0.08em;
  padding: var(--space-4) 10px 6px;
}

/* Nav items: active state uses an accent left bar + bg, not a fully tinted
   bg — this matches macOS source-list selection. */
.nav-item {
  display: flex; align-items: center; gap: 10px;
  padding: 7px 10px;
  border-radius: 7px;
  color: var(--text-secondary);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  letter-spacing: -0.01em;
  transition: background var(--duration-fast),
              color      var(--duration-fast);
  cursor: pointer; text-decoration: none;
  position: relative;
}
.nav-item:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}
.nav-item.active {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: var(--weight-semibold);
}
.nav-item svg {
  width: 16px; height: 16px;
  flex-shrink: 0;
  stroke-width: 1.7;
  opacity: 0.85;
}
.nav-item.active svg { opacity: 1; }

.nav-item .badge {
  margin-left: auto;
  background: var(--accent); color: var(--text-on-accent);
  font-size: 10px; font-weight: var(--weight-semibold);
  padding: 2px 7px; border-radius: var(--radius-pill);
  min-width: 18px; text-align: center; line-height: 1.4;
}
.nav-item .coming-soon {
  margin-left: auto; font-size: 10px;
  color: var(--text-tertiary);
  background: var(--bg-input);
  padding: 2px 8px; border-radius: var(--radius-pill);
  letter-spacing: 0.02em;
}

.sidebar-footer {
  padding: var(--space-4) var(--space-5);
  border-top: 1px solid var(--border-subtle);
  display: flex; flex-direction: column; gap: var(--space-2);
}

.server-status {
  display: flex; align-items: center; gap: var(--space-2);
  font-size: var(--text-xs); color: var(--text-tertiary);
}
.status-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--text-tertiary);
}
.status-dot.online {
  background: var(--status-success);
  box-shadow: 0 0 0 3px rgba(52,199,89,0.16);
}

.cost-meter {
  display: flex; align-items: center; gap: var(--space-2);
  font-size: var(--text-xs); color: var(--text-tertiary);
  font-family: var(--font-mono);
  letter-spacing: -0.01em;
}
.cost-meter:empty { display: none; }
.cost-tokens { color: var(--text-secondary); }
.cost-usd {
  margin-left: auto;
  color: var(--text-primary);
  font-weight: var(--weight-medium);
}

/* === Main area === */
.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  display: flex; flex-direction: column; min-height: 100vh;
}

.topbar {
  height: var(--topbar-height);
  background: var(--bg-topbar);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--border-subtle);
  display: flex; align-items: center;
  padding: 0 var(--space-8);
  position: sticky; top: 0;
  z-index: var(--z-topbar);
  transition: background var(--duration-base);
}

.topbar-left { display: flex; align-items: center; gap: var(--space-4); }

.sidebar-toggle {
  display: none; align-items: center; justify-content: center;
  width: 36px; height: 36px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  transition: background var(--duration-fast);
}
.sidebar-toggle:hover { background: var(--bg-hover); color: var(--text-primary); }
.sidebar-toggle svg { width: 18px; height: 18px; stroke-width: 1.6; }

.page-title {
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  letter-spacing: -0.005em;
  color: var(--text-primary);
}

.topbar-right {
  margin-left: auto;
  display: flex; align-items: center; gap: var(--space-3);
}

.theme-toggle {
  display: inline-flex; align-items: center; justify-content: center;
  width: 36px; height: 36px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  transition: background var(--duration-fast),
              color      var(--duration-fast),
              transform  var(--duration-fast);
}
.theme-toggle:hover { background: var(--bg-hover); color: var(--text-primary); }
.theme-toggle:active { transform: scale(0.94); }
.theme-toggle svg { width: 18px; height: 18px; stroke-width: 1.6; }
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }
[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

.version-tag {
  font-size: 10px; font-weight: var(--weight-semibold);
  color: var(--text-tertiary);
  letter-spacing: 0.08em;
  padding: 3px 9px; border-radius: var(--radius-pill);
  background: transparent;
  border: 1px solid var(--border-subtle);
}

.page-content {
  flex: 1;
  padding: var(--space-8);
  width: 100%;
  max-width: calc(var(--content-max-width) + var(--space-8) * 2);
  margin: 0 auto;
}

/* === Responsive === */
.sidebar-backdrop {
  display: none; position: fixed; inset: 0;
  background: var(--bg-overlay);
  -webkit-backdrop-filter: blur(2px);
  backdrop-filter: blur(2px);
  z-index: calc(var(--z-sidebar) - 1);
  transition: opacity var(--duration-base);
}

@media (max-width: 1024px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .sidebar-backdrop.visible { display: block; }
  .main-content { margin-left: 0; }
  .sidebar-toggle { display: inline-flex; }
  .page-content { padding: var(--space-6) var(--space-5); }
}

@media (max-width: 640px) {
  .topbar { padding: 0 var(--space-5); }
  .page-content { padding: var(--space-5) var(--space-4); }
}