:root {
  --bg: #f5f7fb;
  --bg-deep: #eef2f9;
  --surface: #ffffff;
  --surface-2: #f8fafc;
  --border: #e3e8f0;
  --border-strong: #cdd5e3;
  --text: #1a2238;
  --text-muted: #6c7691;
  --text-soft: #9aa3bd;
  --accent: #2549a8;
  --accent-strong: #173585;
  --accent-soft: #e9eefa;
  --accent-tint: #d2dbf3;
  --success: #16a34a;
  --success-soft: #dcfce7;
  --danger: #dc2626;
  --danger-soft: #fee2e2;
  --warning: #d97706;
  --warning-soft: #fff4e0;
  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 16px;
  --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-sm: 0 2px 6px rgba(15, 23, 42, 0.05);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.07);
  --shadow-lg: 0 12px 32px rgba(15, 23, 42, 0.10);
  --transition: 0.18s cubic-bezier(.4, 0, .2, 1);
}

* { box-sizing: border-box; }

html, body {
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", "Segoe UI", system-ui, -apple-system, "Helvetica Neue", sans-serif;
  font-size: 14px;
  line-height: 1.55;
  letter-spacing: -0.005em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-strong); }

h1, h2, h3, h4 { letter-spacing: -0.015em; color: var(--text); }

/* Layout */
.app-shell { min-height: 100vh; }
.app-layout { display: grid; grid-template-columns: 260px 1fr; min-height: 100vh; }

/* Sidebar */
.app-sidebar {
  background: linear-gradient(168deg, #0f1d40 0%, #1a3170 50%, #2549a8 100%);
  color: rgba(255, 255, 255, 0.92);
  display: flex;
  flex-direction: column;
  padding: 22px 14px 16px;
  position: sticky;
  top: 0;
  height: 100vh;
  box-shadow: 4px 0 24px rgba(15, 23, 42, 0.08);
}
.sidebar-brand {
  display: flex; align-items: center; gap: 12px;
  padding: 4px 8px 18px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  margin-bottom: 14px;
}
.brand-mark {
  width: 40px; height: 40px;
  border-radius: 10px;
  background: linear-gradient(135deg, rgba(255,255,255,0.18) 0%, rgba(255,255,255,0.06) 100%);
  display: grid; place-items: center;
  font-weight: 700; font-size: 18px;
  border: 1px solid rgba(255,255,255,0.12);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.15);
}
.brand-title { font-weight: 700; font-size: 15px; line-height: 1.1; }
.brand-sub { font-size: 11px; color: rgba(255,255,255,0.55); margin-top: 2px; }

.sidebar-nav { display: flex; flex-direction: column; gap: 2px; flex: 1; overflow-y: auto; padding-right: 4px; }
.sidebar-nav::-webkit-scrollbar { width: 4px; }
.sidebar-nav::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.12); border-radius: 4px; }

.sidebar-nav .nav-link {
  color: rgba(255, 255, 255, 0.75);
  display: flex; align-items: center; gap: 10px;
  padding: 9px 12px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 500;
  transition: background var(--transition), color var(--transition), transform var(--transition);
  position: relative;
}
.sidebar-nav .nav-link:hover {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
}
.sidebar-nav .nav-link.active {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.08);
}
.sidebar-nav .nav-link i { font-size: 16px; opacity: 0.85; width: 18px; text-align: center; }

.sidebar-foot { margin-top: 14px; }

.storage-card {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.10);
  border-radius: 12px;
  padding: 12px;
  backdrop-filter: blur(8px);
}
.storage-head { display: flex; align-items: center; gap: 8px; font-size: 12px; color: rgba(255,255,255,0.85); margin-bottom: 8px; font-weight: 600; }
.storage-bar { height: 6px; background: rgba(255,255,255,0.15); border-radius: 999px; overflow: hidden; }
.storage-bar-fill { height: 100%; background: linear-gradient(90deg, #7dd3fc 0%, #38bdf8 100%); border-radius: 999px; transition: width 0.4s ease; }
.storage-meta { display: flex; justify-content: space-between; font-size: 12px; margin-top: 6px; color: rgba(255,255,255,0.85); }
.storage-pct { font-size: 11px; color: rgba(255,255,255,0.55); margin-top: 2px; }

/* Main */
.app-main { display: flex; flex-direction: column; min-width: 0; }

.app-topbar {
  display: flex; justify-content: space-between; align-items: center;
  padding: 14px 28px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 10;
  backdrop-filter: saturate(180%) blur(8px);
  background: rgba(255, 255, 255, 0.92);
}
.topbar-title { font-weight: 600; font-size: 15px; color: var(--text); }
.topbar-actions { display: flex; align-items: center; gap: 12px; }
.role-pill {
  background: var(--accent-soft);
  color: var(--accent-strong);
  padding: 5px 12px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  border: 1px solid var(--accent-tint);
}
.user-chip {
  display: flex; align-items: center; gap: 8px;
  font-size: 13px; color: var(--text); font-weight: 500;
}
.user-chip i { font-size: 18px; color: var(--text-muted); }

.app-content { padding: 28px 32px 64px; max-width: 1440px; width: 100%; }

.messages-stack { display: flex; flex-direction: column; gap: 8px; margin-bottom: 18px; }

.alert {
  border-radius: var(--radius);
  border: 1px solid;
  font-size: 13.5px;
  padding: 12px 16px;
}
.alert-success { background: var(--success-soft); border-color: #bbf7d0; color: #166534; }
.alert-error, .alert-danger { background: var(--danger-soft); border-color: #fecaca; color: #991b1b; }
.alert-warning { background: var(--warning-soft); border-color: #fed7aa; color: #9a3412; }
.alert-info { background: var(--accent-soft); border-color: var(--accent-tint); color: var(--accent-strong); }
.alert-light { background: var(--surface-2); }

/* KPI Cards */
.kpi-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.kpi-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  box-shadow: var(--shadow-xs);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
}
.kpi-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent-tint);
}
.kpi-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent) 0%, #5b7fd6 100%);
  opacity: 0;
  transition: opacity var(--transition);
}
.kpi-card:hover::before { opacity: 1; }
.kpi-card .kpi-label { color: var(--text-muted); font-size: 11.5px; text-transform: uppercase; letter-spacing: 0.06em; font-weight: 600; }
.kpi-card .kpi-value { font-size: 28px; font-weight: 700; margin-top: 6px; letter-spacing: -0.02em; color: var(--text); }
.kpi-card .kpi-icon {
  float: right;
  color: var(--accent);
  opacity: 0.5;
  font-size: 22px;
  background: var(--accent-soft);
  width: 38px; height: 38px;
  border-radius: 10px;
  display: grid; place-items: center;
  margin-left: 12px;
}

/* Panel */
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-xs);
  padding: 20px 22px;
  transition: box-shadow var(--transition);
}
.panel:hover { box-shadow: var(--shadow-sm); }
.panel + .panel { margin-top: 16px; }
.panel-head {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}
.panel-head h2 {
  font-size: 15px; margin: 0;
  font-weight: 600;
  display: flex; align-items: center; gap: 8px;
  color: var(--text);
}
.panel-head h2 i { color: var(--accent); font-size: 17px; }
.panel.p-0 .panel-head { padding: 16px 20px; margin-bottom: 0; }

/* Tables */
.table {
  background: transparent;
  margin-bottom: 0;
  font-size: 13.5px;
}
.table thead th {
  background: var(--surface-2);
  color: var(--text-muted);
  font-weight: 600;
  border-bottom: 1px solid var(--border);
  font-size: 11.5px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 12px 14px;
  white-space: nowrap;
}
.table tbody td {
  vertical-align: middle;
  border-bottom: 1px solid var(--border);
  padding: 12px 14px;
}
.table tbody tr:hover td { background: var(--surface-2); }
.table tbody tr:last-child td { border-bottom: 0; }

/* Buttons */
.btn {
  border-radius: 8px;
  font-weight: 500;
  font-size: 13.5px;
  padding: 7px 14px;
  transition: all var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border-width: 1px;
}
.btn-sm { padding: 4px 10px; font-size: 12.5px; border-radius: 6px; }
.btn-lg { padding: 10px 18px; font-size: 15px; }

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 1px 0 rgba(255,255,255,0.15) inset, 0 2px 6px rgba(37, 73, 168, 0.18);
}
.btn-primary:hover, .btn-primary:focus {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
  box-shadow: 0 1px 0 rgba(255,255,255,0.15) inset, 0 4px 14px rgba(37, 73, 168, 0.30);
  transform: translateY(-1px);
}
.btn-primary:active { transform: translateY(0); }

.btn-outline-primary { color: var(--accent); border-color: var(--border-strong); background: var(--surface); }
.btn-outline-primary:hover { background: var(--accent-soft); border-color: var(--accent); color: var(--accent-strong); }

.btn-outline-secondary { color: var(--text-muted); border-color: var(--border-strong); background: var(--surface); }
.btn-outline-secondary:hover { background: var(--surface-2); border-color: var(--border-strong); color: var(--text); }

.btn-outline-danger { color: var(--danger); border-color: #fecaca; background: var(--surface); }
.btn-outline-danger:hover { background: var(--danger-soft); border-color: var(--danger); color: #991b1b; }

.btn-link { color: var(--text-muted); padding: 7px 10px; }
.btn-link:hover { color: var(--text); text-decoration: none; }

/* Forms */
.form-control, .form-select {
  border-radius: 8px;
  border-color: var(--border-strong);
  font-size: 13.5px;
  padding: 8px 12px;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.form-control:focus, .form-select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37, 73, 168, 0.12);
}
.form-label { font-size: 13px; font-weight: 600; color: var(--text); margin-bottom: 5px; }
.form-check-input { border-color: var(--border-strong); cursor: pointer; }
.form-check-input:checked { background-color: var(--accent); border-color: var(--accent); }
.form-check-label { cursor: pointer; user-select: none; }

/* Breadcrumb */
.breadcrumb-bar {
  display: flex; align-items: center; gap: 6px;
  flex-wrap: wrap;
  font-size: 13.5px;
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 8px 14px;
  border-radius: 999px;
  box-shadow: var(--shadow-xs);
}
.breadcrumb-bar a {
  color: var(--text-muted);
  display: inline-flex; align-items: center; gap: 4px;
  padding: 2px 6px;
  border-radius: 6px;
  transition: background var(--transition), color var(--transition);
}
.breadcrumb-bar a:hover { background: var(--surface-2); color: var(--accent); }
.breadcrumb-sep { color: var(--text-soft); }

/* File / Folder rows */
.file-row, .folder-row {
  display: grid;
  grid-template-columns: 36px minmax(220px, 2fr) 100px 160px 150px minmax(140px, 1fr);
  align-items: center;
  padding: 12px 18px;
  border-bottom: 1px solid var(--border);
  gap: 12px;
  transition: background var(--transition);
}
.file-row:hover, .folder-row:hover { background: var(--surface-2); }
.file-row:last-child, .folder-row:last-child { border-bottom: 0; }
.file-icon, .folder-icon { font-size: 22px; color: var(--accent); }
.folder-icon { color: #f59e0b; }
.file-row a, .folder-row a { color: var(--text); }
.file-row a:hover, .folder-row a:hover { color: var(--accent); }

/* Auth */
.auth-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, #eef2f9 0%, #d2dbf3 100%);
  padding: 24px;
  position: relative;
}
.auth-shell::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(at 25% 30%, rgba(37, 73, 168, 0.08) 0, transparent 45%),
    radial-gradient(at 75% 70%, rgba(125, 211, 252, 0.10) 0, transparent 45%);
  pointer-events: none;
}
.auth-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 36px;
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow-lg);
  position: relative;
  z-index: 1;
}
.auth-card h1 { font-size: 22px; margin-bottom: 6px; font-weight: 700; }
.auth-card .auth-sub { color: var(--text-muted); font-size: 13.5px; margin-bottom: 24px; }
.auth-card .form-label { font-size: 13px; font-weight: 600; }

/* Errors */
.error-shell { min-height: 100vh; display: grid; place-items: center; padding: 24px; background: var(--bg); }
.error-card { background: #fff; border: 1px solid var(--border); border-radius: 18px; padding: 48px; max-width: 520px; text-align: center; box-shadow: var(--shadow-md); }
.error-card h1 { font-size: 64px; margin: 0; color: var(--accent); font-weight: 800; letter-spacing: -0.04em; }
.error-card p { color: var(--text-muted); }

/* Badges */
.badge-soft {
  background: var(--accent-soft);
  color: var(--accent-strong);
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 11.5px;
  font-weight: 600;
  border: 1px solid var(--accent-tint);
  display: inline-flex; align-items: center; gap: 4px;
}
.badge-soft.warn { background: var(--warning-soft); color: #b45309; border-color: #fed7aa; }
.badge-soft.danger { background: var(--danger-soft); color: #b91c1c; border-color: #fecaca; }
.badge-soft.success { background: var(--success-soft); color: #15803d; border-color: #bbf7d0; }

/* Divider */
.hr-soft { border: none; border-top: 1px solid var(--border); margin: 18px 0; }

/* Empty State */
.empty-state {
  text-align: center;
  padding: 48px 20px;
  color: var(--text-muted);
}
.empty-state i { font-size: 40px; opacity: 0.5; }
.empty-state p { margin: 12px 0 0; }
.empty-state h3 { font-size: 16px; color: var(--text); font-weight: 600; margin: 12px 0 4px; }

/* Modals */
.modal-content {
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
}
.modal-header {
  padding: 18px 22px;
  border-bottom: 1px solid var(--border);
}
.modal-title { font-size: 16px; font-weight: 600; color: var(--text); letter-spacing: -0.01em; }
.modal-body { padding: 20px 22px; }
.modal-footer { padding: 14px 22px; border-top: 1px solid var(--border); background: var(--surface-2); border-bottom-left-radius: var(--radius-lg); border-bottom-right-radius: var(--radius-lg); }
.modal-dialog { margin-top: 4rem; }

/* Cards */
.card-staff {
  display: flex; align-items: center; gap: 12px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}
.card-staff:hover {
  border-color: var(--accent-tint);
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}
.card-staff .avatar {
  width: 44px; height: 44px;
  border-radius: 11px;
  background: linear-gradient(135deg, var(--accent-soft) 0%, var(--accent-tint) 100%);
  display: grid; place-items: center;
  flex-shrink: 0;
  color: var(--accent-strong);
  font-weight: 700; font-size: 15px;
  border: 1px solid var(--accent-tint);
}
.card-staff .meta { flex-grow: 1; min-width: 0; }
.card-staff .meta .name { font-weight: 600; color: var(--text); font-size: 14px; text-overflow: ellipsis; overflow: hidden; white-space: nowrap; }
.card-staff .meta .email { color: var(--text-muted); font-size: 12.5px; text-overflow: ellipsis; overflow: hidden; white-space: nowrap; }

/* Pagination */
.pagination .page-link { color: var(--text-muted); border-color: var(--border); }
.pagination .page-item.active .page-link { background: var(--accent); border-color: var(--accent); }

/* Premium scrollbar */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-soft); }

/* Responsive */
@media (max-width: 992px) {
  .app-layout { grid-template-columns: 80px 1fr; }
  .sidebar-brand .brand-title, .sidebar-brand .brand-sub, .sidebar-nav .nav-link span, .sidebar-foot { display: none; }
  .sidebar-nav .nav-link { justify-content: center; }
  .kpi-grid { grid-template-columns: repeat(2, 1fr); }
  .file-row, .folder-row { grid-template-columns: 32px 1fr 80px 100px minmax(120px, 1fr); }
  .file-row > div:nth-child(5), .folder-row > div:nth-child(5) { display: none; }
}
@media (max-width: 600px) {
  .app-layout { grid-template-columns: 1fr; }
  .app-sidebar { position: relative; height: auto; padding: 12px; flex-direction: row; align-items: center; gap: 8px; }
  .sidebar-nav { flex-direction: row; overflow-x: auto; }
  .kpi-grid { grid-template-columns: 1fr; }
  .app-content { padding: 16px; }
  .file-row, .folder-row { grid-template-columns: 28px 1fr auto; }
  .file-row > div:nth-child(3), .file-row > div:nth-child(4), .file-row > div:nth-child(5),
  .folder-row > div:nth-child(3), .folder-row > div:nth-child(4), .folder-row > div:nth-child(5) { display: none; }
}