/* App shell — sidebar + topbar */

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

/* Sidebar */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--sidebar-expanded);
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  z-index: 100;
  transition: width var(--transition);
  overflow: hidden;
}

.sidebar.is-collapsed {
  width: var(--sidebar-collapsed);
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  height: var(--topbar-height);
  padding: 0 var(--space-3);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  overflow: hidden;
}

.sidebar.is-collapsed .sidebar-brand-logo .brand-logo {
  max-width: 40px;
}

.sidebar-brand-logo {
  flex-shrink: 0;
  display: flex;
  align-items: center;
}

.sidebar-brand-text {
  font-weight: 800;
  font-size: 1rem;
  letter-spacing: -0.03em;
  white-space: nowrap;
  opacity: 1;
  transition: opacity var(--transition);
}

.sidebar.is-collapsed .sidebar-brand-text,
.sidebar.is-collapsed .nav-label {
  opacity: 0;
  pointer-events: none;
}

.sidebar-nav {
  flex: 1;
  padding: var(--space-3);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  overflow-y: auto;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-3);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.9rem;
  transition: background var(--transition), color var(--transition);
  border-left: 2px solid transparent;
  white-space: nowrap;
}

.nav-item:hover {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-primary);
  text-decoration: none;
}

.nav-item.is-active {
  background: var(--accent-glow);
  color: var(--text-primary);
  border-left-color: var(--accent);
}

.nav-item svg {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
}

.sidebar-footer {
  padding: var(--space-3);
  border-top: 1px solid var(--border);
}

.sidebar-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: var(--space-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}

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

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

.sidebar.is-collapsed ~ .app-main,
.app-shell:has(.sidebar.is-collapsed) .app-main {
  margin-left: var(--sidebar-collapsed);
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--topbar-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-5);
  background: rgba(2, 6, 38, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

[data-theme='light'] .topbar {
  background: rgba(245, 246, 250, 0.92);
}

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

.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.breadcrumb strong {
  color: var(--text-primary);
  font-weight: 600;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.topbar-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}

.topbar-btn:hover {
  background: var(--surface-raised);
  color: var(--text-primary);
  border-color: var(--border-strong);
}

.user-menu {
  position: relative;
}

.user-avatar {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background: var(--accent);
  border: none;
  color: white;
  font-weight: 700;
  font-size: 0.8rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.user-dropdown {
  position: absolute;
  top: calc(100% + var(--space-2));
  right: 0;
  min-width: 180px;
  background: var(--surface-raised);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  padding: var(--space-2);
  box-shadow: var(--shadow-hover);
  display: none;
}

.user-dropdown.is-open {
  display: block;
}

.user-dropdown a,
.user-dropdown button {
  display: block;
  width: 100%;
  text-align: left;
  padding: var(--space-2) var(--space-3);
  border: none;
  background: none;
  color: var(--text-primary);
  font-size: 0.875rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-decoration: none;
}

.user-dropdown a:hover,
.user-dropdown button:hover {
  background: rgba(255, 255, 255, 0.05);
}

.page-content {
  flex: 1;
  padding: var(--space-5);
  max-width: var(--content-max);
  width: 100%;
  margin: 0 auto;
}

.page-header {
  margin-bottom: var(--space-5);
}

.page-header h1 {
  margin-bottom: var(--space-2);
}

.page-header .subtitle {
  color: var(--text-secondary);
  margin: 0;
}

/* Auth / landing layout */
.auth-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.mesh-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  background: var(--bg);
}

.mesh-bg::before {
  content: '';
  position: absolute;
  inset: -50%;
  background:
    radial-gradient(ellipse 55% 45% at 15% 25%, rgba(255, 102, 0, 0.18), transparent 60%),
    radial-gradient(ellipse 50% 40% at 85% 75%, rgba(2, 6, 38, 0.6), transparent 55%),
    radial-gradient(ellipse 40% 35% at 55% 15%, rgba(0, 120, 212, 0.1), transparent 50%);
  animation: mesh-drift 18s ease-in-out infinite alternate;
}

.mesh-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.03'/%3E%3C/svg%3E");
  opacity: 0.4;
  pointer-events: none;
}

.auth-nav {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-5);
}

.auth-nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: 800;
  font-size: 1.1rem;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  text-decoration: none;
}

.auth-nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.auth-body {
  position: relative;
  z-index: 1;
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-5);
}

.landing-body {
  position: relative;
  z-index: 1;
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-7);
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-6) var(--space-5);
  width: 100%;
}

.landing-hero h1 {
  font-size: clamp(2.25rem, 5vw, 3.25rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: var(--space-5);
}

.landing-hero .accent-text {
  color: var(--accent);
}

.landing-hero p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 480px;
  margin-bottom: var(--space-6);
}

.landing-cta {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.signature-deco {
  position: absolute;
  bottom: 10%;
  left: 5%;
  width: 200px;
  opacity: 0.15;
  pointer-events: none;
}

/* Mobile */
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
    width: var(--sidebar-expanded);
  }

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

  .sidebar.is-collapsed {
    width: var(--sidebar-expanded);
  }

  .app-main {
    margin-left: 0 !important;
  }

  .mobile-menu-btn {
    display: flex !important;
  }

  .landing-body {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .landing-hero p {
    margin-left: auto;
    margin-right: auto;
  }

  .landing-cta {
    justify-content: center;
  }
}

.mobile-menu-btn {
  display: none;
}