/* LAYOUT - IMPROVED */
.app { display: flex; min-height: 100vh; }

/* Sidebar */
.sidebar {
  width: 260px;
  background: var(--nb-black);
  border-right: var(--border);
  position: fixed;
  height: 100vh;
  display: flex;
  flex-direction: column;
  z-index: 100;
}

.sidebar-header {
  padding: 2rem 1.5rem;
  border-bottom: 3px solid var(--nb-yellow);
  background: var(--nb-black);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--nb-white);
  text-decoration: none;
}

.brand-emoji { font-size: 2.5rem; }
.brand-text { 
  font-size: 1.75rem; 
  font-weight: 700; 
  font-family: 'Space Grotesk', sans-serif;
}

.brand-subtitle {
  font-size: 0.75rem;
  color: var(--nb-yellow);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-top: 0.25rem;
  font-weight: 600;
}

.nav {
  flex: 1;
  padding: 1.5rem 1rem;
  overflow-y: auto;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  margin-bottom: 0.5rem;
  text-decoration: none;
  color: var(--nb-white);
  font-weight: 600;
  border: 3px solid transparent;
  transition: all 0.15s ease;
  border-radius: 4px;
  font-size: 1rem;
}

.nav-link:hover {
  background: rgba(255, 255, 255, 0.1);
  border: 3px solid var(--nb-yellow);
  transform: translateX(4px);
}

.nav-link.active {
  background: var(--nb-yellow);
  color: var(--nb-black);
  border: var(--border-thin);
  box-shadow: 4px 0 0 var(--nb-cyan);
}

.nav-icon {
  font-size: 1.5rem;
  width: 28px;
  text-align: center;
}

/* Main Content */
.main-content {
  flex: 1;
  margin-left: 260px;
  padding: 2rem;
  min-height: 100vh;
  background: var(--nb-bg);
}

.section {
  max-width: 1400px;
  margin: 0 auto;
}

.section-title {
  font-size: 3rem;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: var(--border);
  background: var(--nb-yellow);
  padding: 1.5rem 2rem;
  box-shadow: var(--shadow);
  margin-bottom: 2rem;
}

/* Grid Layouts */
.grid {
  display: grid;
  gap: 1.5rem;
}

.grid-2 { grid-template-columns: repeat(auto-fit, minmax(350px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }

/* Mobile */
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
    transition: transform 0.3s ease;
  }
  
  .sidebar.active {
    transform: translateX(0);
  }
  
  .main-content {
    margin-left: 0;
    padding: 1rem;
    padding-top: 80px;
  }
  
  .section-title {
    font-size: 2rem;
    padding: 1rem;
  }
  
  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }
  
  .mobile-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    padding: 0 1rem;
    background: var(--nb-black);
    border-bottom: var(--border);
    z-index: 99;
  }
  
  .mobile-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--nb-white);
  }
  
  .hamburger {
    width: 44px;
    height: 44px;
    background: var(--nb-yellow);
    border: var(--border-thin);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 6px;
  }
  
  .hamburger span {
    width: 24px;
    height: 3px;
    background: var(--nb-black);
    transition: all 0.3s ease;
  }
}