/* ============================================================
   CAMPUSLINK — Layout System
   App shell, sidebar, topbar, page grid, responsive breakpoints.
   ============================================================ */

/* ---------- App Shell ---------- */
.app-layout {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  min-height: 100vh;
  background: var(--bg-primary);
  position: relative;
}

.app-layout::before {
  content: '';
  position: fixed;
  inset: 0;
  background: var(--gradient-mesh);
  pointer-events: none;
  z-index: 0;
}

/* ---------- Sidebar ---------- */
.sidebar {
  grid-column: 1;
  grid-row: 1;
  position: sticky;
  top: 0;
  height: 100vh;
  width: 260px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  padding: var(--space-6) var(--space-4);
  z-index: var(--z-sticky);
  overflow-y: auto;
  transition: width var(--duration-normal) var(--ease-out);
}

.sidebar-backdrop {
  display: none;
}

/* Brand */
.sidebar-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 0 var(--space-3);
  margin-bottom: var(--space-8);
  text-decoration: none;
  cursor: pointer;
}

.sidebar-brand-icon {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  background: var(--gradient-accent);
  display: grid;
  place-items: center;
  color: #fff;
  font-weight: 800;
  font-size: 15px;
  flex-shrink: 0;
  box-shadow: var(--accent-glow);
  transition: transform var(--duration-fast) var(--ease-spring);
}

.sidebar-brand:hover .sidebar-brand-icon {
  transform: scale(1.05);
}

.sidebar-brand-text {
  font-size: 17px;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--text-primary);
}

/* Navigation sections */
.sidebar-section {
  margin-bottom: var(--space-6);
}

.sidebar-section-label {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-muted);
  padding: 0 var(--space-3);
  margin-bottom: var(--space-2);
}

/* Nav items */
.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-3);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 13.5px;
  font-weight: 500;
  cursor: pointer;
  border: none;
  background: transparent;
  width: 100%;
  text-align: left;
  font-family: var(--font-sans);
  transition: all var(--duration-fast) var(--ease-out);
  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: 600;
}

.nav-item.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 20px;
  background: var(--accent);
  border-radius: 0 var(--radius-full) var(--radius-full) 0;
}

.nav-item-icon {
  font-size: 18px;
  width: 22px;
  text-align: center;
  flex-shrink: 0;
  line-height: 1;
}

.nav-item-label {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.nav-item-badge {
  margin-left: auto;
  font-size: 10px;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: var(--radius-full);
  background: var(--danger-soft);
  color: var(--danger);
  line-height: 1.4;
}

/* Sidebar footer */
.sidebar-footer {
  margin-top: auto;
  padding: var(--space-4) var(--space-3);
  border-top: 1px solid var(--border-subtle);
}

.sidebar-privacy {
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.5;
  padding: var(--space-3);
  background: var(--bg-elevated);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
}

.sidebar-privacy strong {
  color: var(--text-secondary);
  display: block;
  margin-bottom: var(--space-1);
}

/* ---------- Main Content Area ---------- */
.main-content {
  grid-column: 2;
  grid-row: 1;
  min-width: 0;
  width: 100%;
  position: relative;
  z-index: var(--z-base);
  display: flex;
  flex-direction: column;
}

/* ---------- Topbar ---------- */
.topbar {
  position: sticky;
  top: 0;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-8);
  background: hsla(228, 18%, 8%, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  z-index: var(--z-sticky);
}

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

.topbar-breadcrumb {
  font-size: 13px;
  color: var(--text-muted);
}

.topbar-breadcrumb span {
  color: var(--text-secondary);
}

.topbar-mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 22px;
  cursor: pointer;
  padding: var(--space-2);
}

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

.topbar-search {
  position: relative;
}

.topbar-search input {
  width: 220px;
  padding: var(--space-2) var(--space-3) var(--space-2) var(--space-8);
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 13px;
  font-family: var(--font-sans);
  transition: all var(--duration-fast) var(--ease-out);
}

.topbar-search input::placeholder {
  color: var(--text-muted);
}

.topbar-search input:focus {
  outline: none;
  border-color: var(--accent);
  width: 280px;
  background: var(--bg-surface);
}

.topbar-search-icon {
  position: absolute;
  left: var(--space-3);
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 14px;
  pointer-events: none;
}

.topbar-notification {
  position: relative;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 19px;
  cursor: pointer;
  padding: var(--space-2);
  border-radius: var(--radius-md);
  transition: all var(--duration-fast) var(--ease-out);
}

.topbar-notification:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.topbar-notification-dot {
  position: absolute;
  top: 6px;
  right: 6px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--danger);
  animation: dotPulse 2s ease-in-out infinite;
}

.topbar-role-badge {
  font-size: 11.5px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.role-selector {
  padding: var(--space-2) var(--space-3);
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 13px;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: border-color var(--duration-fast) var(--ease-out);
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%236b7280' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  padding-right: 30px;
}

.role-selector:hover {
  border-color: var(--border-strong);
}

.role-selector:focus {
  outline: none;
  border-color: var(--accent);
}

.topbar-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--gradient-accent);
  display: grid;
  place-items: center;
  color: #fff;
  font-weight: 700;
  font-size: 13px;
  cursor: pointer;
  transition: transform var(--duration-fast) var(--ease-spring);
  border: 2px solid transparent;
}

.topbar-avatar:hover {
  transform: scale(1.08);
  border-color: var(--accent);
}

/* ---------- Page Container ---------- */
.page {
  flex: 1;
  max-width: 1280px;
  width: 100%;
  margin: 0 auto;
  padding: var(--space-8);
  animation: fadeIn var(--duration-normal) var(--ease-out);
}

/* ---------- Page Header ---------- */
.page-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: var(--space-6);
  margin-bottom: var(--space-8);
  animation: fadeInUp var(--duration-slow) var(--ease-out);
}

.page-header-content {
  flex: 1;
}

.page-eyebrow {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--accent);
  margin-bottom: var(--space-2);
}

.page-title {
  font-size: 30px;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-2);
}

.page-subtitle {
  font-size: 14px;
  color: var(--text-secondary);
  max-width: 520px;
}

.page-actions {
  display: flex;
  gap: var(--space-3);
  flex-shrink: 0;
}

/* ---------- Grid Layouts ---------- */
.grid {
  display: grid;
  gap: var(--space-5);
}

.grid-kpis {
  grid-template-columns: repeat(4, 1fr);
  margin-bottom: var(--space-5);
}

.grid-main {
  grid-template-columns: 1.3fr 0.7fr;
}

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

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

.stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

/* ---------- Auth Layout (no sidebar) ---------- */
.auth-layout {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr 1fr;
  background: var(--bg-primary);
  position: relative;
}

.auth-layout::before {
  content: '';
  position: fixed;
  inset: 0;
  background: var(--gradient-mesh);
  pointer-events: none;
}

.auth-showcase {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: var(--space-16);
  position: relative;
  z-index: 1;
}

.auth-form-container {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-8);
  position: relative;
  z-index: 1;
}

/* ---------- Landing Layout (no sidebar) ---------- */
.landing-layout {
  min-height: 100vh;
  background: var(--bg-primary);
  position: relative;
}

.landing-layout::before {
  content: '';
  position: fixed;
  inset: 0;
  background: var(--gradient-mesh);
  pointer-events: none;
}

.landing-nav {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  padding: var(--space-4) var(--space-8);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: hsla(228, 18%, 8%, 0.75);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
}

.landing-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-16) var(--space-8);
  position: relative;
  z-index: 1;
}

/* ---------- Responsive ---------- */
@media (max-width: 1080px) {
  .grid-kpis {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-main {
    grid-template-columns: 1fr;
  }

  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 860px) {
  .app-layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    grid-column: auto;
    grid-row: auto;
    position: fixed;
    left: -280px;
    width: 260px;
    z-index: var(--z-modal);
    transition: left var(--duration-normal) var(--ease-out);
    box-shadow: var(--shadow-xl);
  }

  .sidebar.open {
    left: 0;
  }

  .sidebar-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: hsla(0, 0%, 0%, 0.5);
    z-index: calc(var(--z-modal) - 1);
  }

  .sidebar.open ~ .sidebar-backdrop {
    display: block;
  }

  .main-content {
    grid-column: 1;
    grid-row: 1;
    width: 100%;
    min-width: 0;
  }

  .topbar-mobile-toggle {
    display: block;
  }

  .topbar {
    padding: 0 var(--space-4);
  }

  .page {
    padding: var(--space-5) var(--space-4);
  }

  .page-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .page-actions {
    width: 100%;
  }

  .auth-layout {
    grid-template-columns: 1fr;
  }

  .auth-showcase {
    display: none;
  }
}

@media (max-width: 640px) {
  .app-layout, .main-content {
    overflow-x: hidden;
    max-width: 100vw;
  }

  .grid-kpis {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-3);
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }

  .card {
    padding: var(--space-4);
    border-radius: var(--radius-md);
  }

  .card-header {
    margin-bottom: var(--space-3);
    flex-wrap: wrap;
    gap: var(--space-2);
  }

  .table-container {
    max-width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin-bottom: var(--space-3);
  }

  .topbar-search,
  .topbar-breadcrumb {
    display: none;
  }

  .page {
    padding: var(--space-4) var(--space-3);
    max-width: 100vw;
    box-sizing: border-box;
  }

  .page-header {
    margin-bottom: var(--space-4);
    gap: var(--space-3);
  }

  .page-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    width: 100%;
  }

  .page-actions .btn {
    flex: 1 1 auto;
    min-width: 110px;
    justify-content: center;
  }

  .page-title {
    font-size: 22px;
  }

  h1 { font-size: 24px; }
  h2 { font-size: 19px; }

  /* Input fields: prevent iOS auto-zoom on focus */
  input[type="text"],
  input[type="email"],
  input[type="password"],
  input[type="number"],
  select,
  textarea {
    font-size: 16px !important;
  }
}

@media (max-width: 480px) {
  .grid-kpis {
    grid-template-columns: 1fr;
    gap: var(--space-3);
  }

  .topbar {
    padding: 0 var(--space-3);
    height: 56px;
    gap: 6px;
  }

  .topbar-right {
    gap: 6px;
  }

  .role-selector {
    max-width: 110px;
    font-size: 11px;
    padding: 4px 18px 4px 6px;
    background-position: right 4px center;
  }

  .topbar-role-badge {
    font-size: 10px;
    padding: 2px 6px;
    max-width: 75px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .topbar-logout-btn .logout-text {
    display: none;
  }

  .topbar-logout-btn .logout-icon {
    display: inline !important;
    font-size: 14px;
  }

  .topbar-avatar {
    width: 32px;
    height: 32px;
    font-size: 11.5px;
    flex-shrink: 0;
  }

  .topbar-notification {
    padding: var(--space-1);
    font-size: 15px;
    flex-shrink: 0;
  }

  .page {
    padding: var(--space-3) var(--space-2);
  }

  .page-title {
    font-size: 20px;
  }

  .page-actions .btn {
    width: 100%;
  }

  h1 { font-size: 21px; }
  h2 { font-size: 18px; }
}

@media (max-width: 360px) {
  .topbar-role-badge {
    display: none;
  }
}