/* css/layout.css — Grid shell & responsive nav */

:root {
  --sidebar-w: 260px;
  --header-h: 64px;
  --bnav-h: 64px;
}

body {
  display: flex;
  min-height: 100vh;
  background: var(--bg);
  color: var(--tx);
  overflow-x: hidden;
}

/* Sidebar (Desktop) */
.sidebar {
  width: var(--sidebar-w);
  height: 100vh;
  position: fixed;
  left: 0;
  top: 0;
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  z-index: 100;
  padding: var(--s6) var(--s4);
  transition: transform 0.3s var(--ease);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--s3);
  padding: 0 var(--s2) var(--s8);
}

.brand-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  box-shadow: 0 4px 12px rgba(124, 92, 252, 0.3);
}

.brand span {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 18px;
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  flex-direction: column;
  gap: var(--s1);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--s3);
  padding: var(--s3) var(--s4);
  border-radius: 12px;
  color: var(--tx-2);
  text-decoration: none;
  font-weight: 500;
  transition: all 0.2s;
}

.nav-item:hover {
  background: var(--surface-2);
  color: var(--tx);
}

.nav-item.active {
  background: var(--primary-dim);
  color: var(--primary);
  font-weight: 600;
}

.nav-icon {
  font-size: 18px;
  opacity: 0.8;
}

/* Main Content */
.main-content {
  flex: 1;
  margin-left: var(--sidebar-w);
  padding: var(--s8) var(--s12);
  min-height: 100vh;
  max-width: 1400px;
  margin-right: auto;
}

/* Mobile Header & Bottom Nav (Hidden on Desktop) */
.mobile-header, .bottom-nav {
  display: none;
}

/* Responsive */
@media (max-width: 1024px) {
  .sidebar {
    display: none;
  }
  
  .main-content {
    margin-left: 0;
    padding: calc(var(--header-h) + var(--s6)) var(--s4) calc(var(--bnav-h) + var(--s8));
  }

  .mobile-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-h);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--border);
    padding: 0 var(--s4);
    z-index: 90;
  }

  .profile-pill {
    background: var(--surface-2);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    color: var(--primary);
    border: 1px solid var(--border);
  }

  .bottom-nav {
    display: flex;
    justify-content: space-around;
    align-items: center;
    height: var(--bnav-h);
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border-top: 1px solid var(--border);
    padding: 0 var(--s2);
    z-index: 90;
    padding-bottom: env(safe-area-inset-bottom);
  }

  .bnav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    color: var(--tx-3);
    text-decoration: none;
    font-size: 10px;
    font-weight: 500;
    flex: 1;
  }

  .bnav-item.active {
    color: var(--primary);
  }

  .bnav-icon {
    font-size: 20px;
  }
}

/* Utility Containers */
.container-narrow {
  max-width: 800px;
  margin: 0 auto;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--s6);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--s6);
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--s5);
}

@media (max-width: 1200px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }
}