:root {
    --pa-primary: #1d4ed8;
    --pa-primary-dark: #1e3a8a;
    --pa-accent: #3b82f6;
    --pa-sidebar-bg: #0b1220;
    --pa-sidebar-bg2: #111c30;
    --pa-sidebar-hover: rgba(255, 255, 255, .06);
    --pa-content-bg: #f4f6fb;
    --pa-border: #e6eaf1;
    --pa-text: #1f2937;
    --pa-muted: #6b7280;
    --pa-sidebar-width: 258px;
    --pa-radius: 12px;
    --pa-shadow: 0 1px 2px rgba(16, 24, 40, .05), 0 1px 3px rgba(16, 24, 40, .06);
    --pa-shadow-md: 0 4px 12px rgba(16, 24, 40, .08);
}

html { font-size: 14.5px; }
body {
    background: var(--pa-content-bg);
    color: var(--pa-text);
    font-family: 'Inter', 'Segoe UI', Roboto, -apple-system, BlinkMacSystemFont, Arial, sans-serif;
    -webkit-font-smoothing: antialiased;
    letter-spacing: .1px;
}

h1, h2, h3, h4, h5, h6 { color: #0f172a; font-weight: 600; }
a { text-decoration: none; }

/* ---------- Auth pages ---------- */
.auth-body {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(1200px 600px at 20% -10%, #1e3a8a 0%, transparent 60%),
                linear-gradient(135deg, #0b1220, #1e3a8a);
    padding: 1rem;
}
.auth-wrapper { width: 100%; max-width: 460px; }
.auth-card { background: #fff; border-radius: 16px; padding: 2.25rem; box-shadow: 0 20px 50px rgba(2, 6, 23, .35); }
.auth-brand h4 { color: var(--pa-primary-dark); font-weight: 700; }

/* ---------- Admin layout ---------- */
.admin-layout { display: flex; min-height: 100vh; }

.admin-sidebar {
    width: var(--pa-sidebar-width);
    background: linear-gradient(180deg, var(--pa-sidebar-bg2) 0%, var(--pa-sidebar-bg) 100%);
    color: #cbd5e1;
    position: fixed;
    top: 0; left: 0; bottom: 0;
    overflow-y: auto;
    transition: transform .22s ease;
    z-index: 1030;
    box-shadow: inset -1px 0 0 rgba(255,255,255,.04);
}
.admin-sidebar::-webkit-scrollbar { width: 6px; }
.admin-sidebar::-webkit-scrollbar-thumb { background: rgba(255,255,255,.12); border-radius: 3px; }

.sidebar-brand {
    display: flex; align-items: center; gap: .7rem;
    padding: 1.3rem 1.35rem 1.15rem;
    font-size: 1.08rem; font-weight: 700; color: #fff;
    border-bottom: 1px solid rgba(255,255,255,.07);
}
.sidebar-brand i {
    color: #fff;
    background: linear-gradient(135deg, var(--pa-accent), var(--pa-primary-dark));
    width: 34px; height: 34px; border-radius: 9px;
    display: inline-flex; align-items: center; justify-content: center;
    font-size: 1rem; box-shadow: 0 4px 10px rgba(59,130,246,.35);
}
.sidebar-brand span { letter-spacing: .2px; }

.sidebar-nav { padding: .6rem .6rem 1.5rem; }
.sidebar-heading {
    padding: 1rem 1rem .4rem; font-size: .68rem; font-weight: 600;
    text-transform: uppercase; letter-spacing: .09em; color: #64748b;
}
.sidebar-nav .nav-link {
    display: flex; align-items: center; gap: .8rem;
    padding: .62rem .85rem; margin: .12rem 0; color: #aab4c5; font-size: .9rem; font-weight: 500;
    border-radius: 9px; border-left: none; transition: background .15s ease, color .15s ease;
}
.sidebar-nav .nav-link i { width: 20px; text-align: center; font-size: .95rem; opacity: .9; }
.sidebar-nav .nav-link:hover { background: var(--pa-sidebar-hover); color: #fff; }
.sidebar-nav .nav-link.active {
    background: linear-gradient(135deg, var(--pa-primary), var(--pa-primary-dark));
    color: #fff; box-shadow: 0 6px 14px rgba(29,78,216,.35);
}
.sidebar-nav .nav-link.active i { opacity: 1; }

.admin-main { flex: 1; margin-left: var(--pa-sidebar-width); display: flex; flex-direction: column; min-width: 0; }

.admin-navbar {
    display: flex; align-items: center; gap: 1rem;
    background: rgba(255,255,255,.85); backdrop-filter: saturate(180%) blur(8px);
    padding: .7rem 1.5rem;
    border-bottom: 1px solid var(--pa-border); position: sticky; top: 0; z-index: 1020;
}
.navbar-title { font-weight: 600; font-size: 1.05rem; color: #0f172a; }
.navbar-right { margin-left: auto; }
.sidebar-toggle { color: #334155; font-size: 1.15rem; }
.admin-navbar .fa-bell { color: #64748b; transition: color .15s; }
.admin-navbar .fa-bell:hover { color: var(--pa-primary); }

.user-menu { display: flex; align-items: center; gap: .6rem; text-decoration: none; color: #1e293b; }
.avatar {
    width: 38px; height: 38px; border-radius: 50%;
    background: linear-gradient(135deg, var(--pa-accent), var(--pa-primary-dark)); color: #fff;
    display: inline-flex; align-items: center; justify-content: center; font-weight: 600;
    box-shadow: 0 4px 10px rgba(29,78,216,.3);
}
.user-name { font-weight: 600; font-size: .88rem; line-height: 1.1; }
.user-role { font-size: .72rem; color: var(--pa-muted); }

.admin-content { padding: 1.6rem 1.75rem; flex: 1; }
.admin-footer { padding: 1rem 1.75rem; border-top: 1px solid var(--pa-border); background: #fff; color: var(--pa-muted); }

/* ---------- Cards ---------- */
.card { border: 1px solid var(--pa-border); border-radius: var(--pa-radius); box-shadow: var(--pa-shadow); transition: box-shadow .18s ease, transform .18s ease; }
.card:hover { box-shadow: var(--pa-shadow-md); }
.card-header {
    background: #fff; font-weight: 600; color: #0f172a;
    border-bottom: 1px solid var(--pa-border); padding: .85rem 1.1rem; border-radius: var(--pa-radius) var(--pa-radius) 0 0 !important;
}
.card-body { padding: 1.15rem; }

/* ---------- Stat tiles ---------- */
.stat-tile {
    border-radius: var(--pa-radius); padding: 1.25rem 1.35rem; color: #fff;
    display: flex; align-items: center; justify-content: space-between;
    box-shadow: var(--pa-shadow-md); position: relative; overflow: hidden;
    transition: transform .18s ease, box-shadow .18s ease;
}
.stat-tile:hover { transform: translateY(-3px); box-shadow: 0 12px 22px rgba(16,24,40,.16); }
.stat-tile::after {
    content: ''; position: absolute; right: -30px; top: -30px;
    width: 120px; height: 120px; border-radius: 50%; background: rgba(255,255,255,.08);
}
.stat-tile .stat-value { font-size: 1.85rem; font-weight: 700; line-height: 1; }
.stat-tile .stat-label { opacity: .92; font-size: .82rem; margin-top: .25rem; }
.stat-tile .stat-icon { font-size: 2.1rem; opacity: .38; position: relative; z-index: 1; }
.bg-grad-blue   { background: linear-gradient(135deg, #3b82f6, #1e3a8a); }
.bg-grad-green  { background: linear-gradient(135deg, #10b981, #065f46); }
.bg-grad-orange { background: linear-gradient(135deg, #f59e0b, #b45309); }
.bg-grad-purple { background: linear-gradient(135deg, #8b5cf6, #4c1d95); }
.bg-grad-teal   { background: linear-gradient(135deg, #14b8a6, #134e4a); }
.bg-grad-red    { background: linear-gradient(135deg, #ef4444, #991b1b); }

/* ---------- Buttons ---------- */
.btn { border-radius: 9px; font-weight: 500; }
.btn-sm { border-radius: 8px; }
.btn-primary { background-color: var(--pa-primary); border-color: var(--pa-primary); }
.btn-primary:hover { background-color: var(--pa-primary-dark); border-color: var(--pa-primary-dark); }
.btn-outline-primary { color: var(--pa-primary); border-color: var(--pa-primary); }
.btn-outline-primary:hover { background-color: var(--pa-primary); border-color: var(--pa-primary); }

/* ---------- Forms ---------- */
.form-control, .form-select { border-radius: 9px; border-color: #d7dce5; }
.form-control:focus, .form-select:focus { border-color: var(--pa-accent); box-shadow: 0 0 0 .2rem rgba(59,130,246,.15); }
.form-label { font-weight: 500; font-size: .86rem; color: #374151; margin-bottom: .3rem; }

/* ---------- Tables ---------- */
.table { color: var(--pa-text); }
.table > thead th {
    font-size: .74rem; text-transform: uppercase; letter-spacing: .04em;
    color: #64748b; font-weight: 600; border-bottom: 1px solid var(--pa-border); background: #fbfcfe;
}
.table > tbody td { vertical-align: middle; }
.table-hover > tbody > tr:hover { background: #f5f8ff; }
.table-responsive { border-radius: 10px; }

/* ---------- Misc ---------- */
.badge { font-weight: 500; }
.badge-status { font-size: .72rem; padding: .38em .65em; border-radius: 6px; }
.alert { border: none; border-radius: 10px; }
.nav-tabs .nav-link { color: var(--pa-muted); font-weight: 500; border: none; border-bottom: 2px solid transparent; }
.nav-tabs .nav-link.active { color: var(--pa-primary); background: transparent; border-bottom-color: var(--pa-primary); }
.dropdown-menu { border: 1px solid var(--pa-border); border-radius: 12px; box-shadow: var(--pa-shadow-md); }

/* ---------- Responsive ---------- */
@media (max-width: 992px) {
    .admin-sidebar { transform: translateX(-100%); }
    .admin-sidebar.show { transform: translateX(0); }
    .admin-main { margin-left: 0; }
    .admin-content { padding: 1.1rem; }
}