:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #dbeafe;
    --bg: #f8fafc;
    --bg-elevated: #ffffff;
    --text: #0f172a;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --shadow: 0 1px 3px rgba(15, 23, 42, 0.06), 0 8px 24px rgba(15, 23, 42, 0.04);
    --shadow-lg: 0 10px 40px rgba(15, 23, 42, 0.08);
    --radius: 14px;
    --radius-sm: 10px;
    --sidebar-width: 280px;
    --sidebar-collapsed: 84px;
    --header-height: 72px;
    --success: #16a34a;
    --danger: #ef4444;
    --warning: #f59e0b;
    --transition: 0.2s ease;
}

[data-theme="dark"] {
    --bg: #0b1220;
    --bg-elevated: #111827;
    --text: #f8fafc;
    --text-muted: #94a3b8;
    --border: #1f2937;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.2);
    --primary-light: rgba(37, 99, 235, 0.15);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }
img, svg { display: block; max-width: 100%; }

.app-body { min-height: 100vh; }
.app-shell {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-elevated);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 100;
    transition: width var(--transition), transform var(--transition);
}
.sidebar.collapsed { width: var(--sidebar-collapsed); }
.sidebar.collapsed .brand-text,
.sidebar.collapsed .nav-item span,
.sidebar.collapsed .nav-badge,
.sidebar.collapsed .nav-label,
.sidebar.collapsed .user-info { display: none; }
.sidebar.collapsed .nav-item { justify-content: center; }

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 1rem;
    border-bottom: 1px solid var(--border);
}
.brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    min-width: 0;
}
.brand-icon {
    width: 42px;
    height: 42px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--primary), #60a5fa);
    color: #fff;
    display: grid;
    place-items: center;
    flex-shrink: 0;
}
.brand-icon.lg { width: 56px; height: 56px; border-radius: 16px; }
.brand-icon-logo {
    background: var(--bg);
    border: 1px solid var(--border);
    overflow: hidden;
    padding: 0;
}
.brand-icon-logo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.brand-text { display: flex; flex-direction: column; min-width: 0; }
.brand-text strong { font-size: 1rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.brand-text small { color: var(--text-muted); font-size: 0.75rem; }

.sidebar-toggle, .icon-btn {
    width: 40px;
    height: 40px;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text-muted);
    border-radius: 10px;
    display: grid;
    place-items: center;
    cursor: pointer;
    transition: var(--transition);
}
.sidebar-toggle:hover, .icon-btn:hover {
    color: var(--primary);
    border-color: var(--primary-light);
    background: var(--primary-light);
}

.sidebar-nav {
    flex: 1;
    padding: 1rem 0.75rem;
    overflow-y: auto;
}
.nav-empty {
    padding: 0.75rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}
.nav-label {
    display: block;
    padding: 0.5rem 0.75rem;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    font-weight: 600;
}
.nav-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    margin-bottom: 0.25rem;
    transition: var(--transition);
    position: relative;
}
.nav-item:hover { background: var(--bg); color: var(--text); }
.nav-item.active {
    background: var(--primary-light);
    color: var(--primary);
    font-weight: 600;
}
.nav-badge {
    margin-left: auto;
    font-size: 0.65rem;
    padding: 0.15rem 0.45rem;
    border-radius: 999px;
    background: var(--bg);
    color: var(--text-muted);
    border: 1px solid var(--border);
}

.sidebar-footer {
    padding: 1rem 0.75rem;
    border-top: 1px solid var(--border);
}
.user-card {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    margin-bottom: 0.5rem;
}
.user-card-link {
    border-radius: 12px;
    color: inherit;
    text-decoration: none;
    transition: background 0.15s;
}
.user-card-link:hover { background: var(--bg); }
.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    background: linear-gradient(135deg, #6366f1, var(--primary));
    color: #fff;
    display: grid;
    place-items: center;
    font-weight: 700;
    font-size: 0.85rem;
    flex-shrink: 0;
}
.user-avatar.sm { width: 36px; height: 36px; font-size: 0.75rem; }
.user-info { min-width: 0; }
.user-info strong, .user-info small { display: block; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.user-info small { color: var(--text-muted); }

.sidebar-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.45);
    z-index: 90;
}
.sidebar-backdrop.show { display: block; }

/* Main */
.app-main {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-width: 0;
    transition: margin-left var(--transition);
}
.sidebar.collapsed ~ .app-main,
.app-shell:has(.sidebar.collapsed) .app-main {
    margin-left: var(--sidebar-collapsed);
}

.app-header {
    height: var(--header-height);
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    background: rgba(248, 250, 252, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 50;
}
[data-theme="dark"] .app-header { background: rgba(17, 24, 39, 0.85); }

.header-left { display: flex; align-items: center; gap: 1rem; min-width: 0; }
.mobile-menu { display: none; }
.page-heading h1 { margin: 0; font-size: 1.25rem; }
.page-heading p { margin: 0.15rem 0 0; color: var(--text-muted); font-size: 0.875rem; }

.header-right { display: flex; align-items: center; gap: 0.75rem; }
.search-box {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 0.5rem 1rem;
    min-width: 220px;
}
.search-box input {
    border: 0;
    background: transparent;
    outline: none;
    width: 100%;
    color: var(--text);
}
.icon-btn { position: relative; }
.icon-btn .dot {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--danger);
    border: 2px solid var(--bg-elevated);
}

.notifications-wrap { position: relative; }
.notif-badge {
    position: absolute;
    top: 4px;
    right: 4px;
    min-width: 16px;
    height: 16px;
    padding: 0 4px;
    border-radius: 999px;
    background: var(--danger);
    color: #fff;
    font-size: 0.625rem;
    font-weight: 700;
    line-height: 16px;
    text-align: center;
    border: 2px solid var(--bg-elevated);
    pointer-events: none;
}
.notifications-panel {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    width: min(360px, calc(100vw - 2rem));
    max-height: min(420px, calc(100vh - var(--header-height) - 2rem));
    display: flex;
    flex-direction: column;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 14px;
    box-shadow: var(--shadow-lg);
    z-index: 120;
    overflow: hidden;
}
.notifications-panel[hidden] { display: none !important; }
.notifications-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    padding: 0.875rem 1rem;
    border-bottom: 1px solid var(--border);
    background: var(--bg);
}
.notifications-head strong { font-size: 0.9rem; }
.link-btn {
    border: 0;
    background: transparent;
    color: var(--primary);
    font-size: 0.78rem;
    font-weight: 600;
    cursor: pointer;
    padding: 0.15rem 0.25rem;
}
.link-btn:hover { text-decoration: underline; }
.notifications-list {
    overflow-y: auto;
    padding: 0.35rem;
}
.notifications-empty {
    margin: 0;
    padding: 1.25rem 1rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
}
.notification-item {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 0.65rem;
    width: 100%;
    padding: 0.75rem;
    border: 0;
    border-radius: 10px;
    background: transparent;
    text-align: left;
    cursor: pointer;
    color: inherit;
    transition: background 0.15s;
}
.notification-item:hover { background: var(--bg); }
.notification-icon {
    width: 34px;
    height: 34px;
    border-radius: 10px;
    display: grid;
    place-items: center;
    flex-shrink: 0;
}
.notification-icon i { width: 16px; height: 16px; }
.notification-item.severity-critical .notification-icon {
    background: rgba(239, 68, 68, 0.12);
    color: #ef4444;
}
.notification-item.severity-warning .notification-icon {
    background: rgba(245, 158, 11, 0.14);
    color: #d97706;
}
.notification-item.severity-info .notification-icon {
    background: var(--primary-light);
    color: var(--primary);
}
.notification-body strong {
    display: block;
    font-size: 0.82rem;
    line-height: 1.25;
    margin-bottom: 0.15rem;
}
.notification-body p {
    margin: 0;
    font-size: 0.76rem;
    line-height: 1.35;
    color: var(--text-muted);
}

.app-content { padding: 1.5rem; }

/* Cards & panels */
.panel {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.25rem;
}
.panel-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: 1rem;
}
.panel-header h2 { margin: 0; font-size: 1rem; }
.panel-header p { margin: 0.25rem 0 0; color: var(--text-muted); font-size: 0.875rem; }

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}
.stat-card {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    display: flex;
    gap: 1rem;
    box-shadow: var(--shadow);
    transition: transform var(--transition), box-shadow var(--transition);
}
.stat-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.stat-card span { color: var(--text-muted); font-size: 0.875rem; }
.stat-card strong { display: block; font-size: 1.5rem; margin: 0.25rem 0; }
.stat-card small { color: var(--text-muted); font-size: 0.8rem; }
.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 14px;
    display: grid;
    place-items: center;
    flex-shrink: 0;
}
.stat-icon.blue { background: #dbeafe; color: #2563eb; }
.stat-icon.indigo { background: #e0e7ff; color: #4f46e5; }
.stat-icon.purple { background: #ede9fe; color: #7c3aed; }
.stat-icon.amber { background: #fef3c7; color: #d97706; }

.dashboard-toolbar {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 1.25rem;
}
.dashboard-period-info h2 { margin: 0 0 0.25rem; font-size: 1.25rem; }
.dashboard-period-info p { margin: 0; color: var(--text-muted); font-size: 0.9rem; }
.dashboard-filter {
    display: flex;
    align-items: flex-end;
    gap: 0.75rem;
    flex-wrap: wrap;
}
.dashboard-filter .filter-field { display: grid; gap: 0.35rem; }
.dashboard-filter label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}
.dashboard-filter select {
    min-width: 130px;
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 0.55rem 0.75rem;
    background: var(--bg-elevated);
    color: var(--text);
}
.btn-sm { padding: 0.55rem 0.9rem; font-size: 0.85rem; display: inline-flex; align-items: center; gap: 0.35rem; }

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
}
.chart-wrap { position: relative; height: 280px; }
.chart-wrap.doughnut { height: 240px; max-width: 280px; margin: 0 auto; }

.summary-list { display: grid; gap: 0.75rem; }
.summary-item {
    display: flex;
    align-items: center;
    gap: 0.875rem;
    padding: 0.875rem;
    border-radius: var(--radius-sm);
    background: var(--bg);
}
.summary-icon {
    width: 42px;
    height: 42px;
    border-radius: 12px;
    display: grid;
    place-items: center;
}
.summary-icon.success { background: #dcfce7; color: var(--success); }
.summary-icon.danger { background: #fee2e2; color: var(--danger); }
.summary-item span { display: block; color: var(--text-muted); font-size: 0.875rem; }

.ranking-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.75rem; }
.ranking-list li {
    display: flex;
    align-items: center;
    gap: 0.875rem;
    padding: 0.75rem;
    border-radius: var(--radius-sm);
    background: var(--bg);
}
.rank {
    width: 28px;
    height: 28px;
    border-radius: 8px;
    background: var(--primary-light);
    color: var(--primary);
    display: grid;
    place-items: center;
    font-weight: 700;
    font-size: 0.8rem;
}
.rank-info strong { display: block; }
.rank-info small { color: var(--text-muted); }

.shortcuts-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.75rem;
}
.shortcut-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1.25rem;
    border-radius: var(--radius-sm);
    background: var(--bg);
    border: 1px dashed var(--border);
    transition: var(--transition);
}
.shortcut-card:not(.disabled):hover {
    border-color: var(--primary);
    background: var(--primary-light);
    color: var(--primary);
}
.shortcut-card.disabled { opacity: 0.6; cursor: not-allowed; }

.empty-state {
    text-align: center;
    padding: 2rem 1rem;
    color: var(--text-muted);
}
.empty-state i { margin: 0 auto 0.75rem; }

/* Buttons & forms */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-sm);
    border: 0;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
}
.btn-primary {
    background: var(--primary);
    color: #fff;
}
.btn-primary:hover { background: var(--primary-hover); }
.btn-ghost {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text);
}
.btn-ghost:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-light);
}
.btn-lg {
    padding: 0.95rem 1.35rem;
    font-size: 1rem;
}
a.btn { text-decoration: none; }
.btn-block { width: 100%; }

.form-group { margin-bottom: 1rem; }
.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
}
.input-icon {
    position: relative;
    display: flex;
    align-items: center;
}
.input-icon > i:first-child {
    position: absolute;
    left: 1rem;
    color: var(--text-muted);
    pointer-events: none;
}
.input-icon input {
    width: 100%;
    padding: 0.875rem 1rem 0.875rem 2.75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-elevated);
    color: var(--text);
    transition: var(--transition);
}
.input-icon input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}
.input-action {
    position: absolute;
    right: 0.5rem;
    width: 36px;
    height: 36px;
    border: 0;
    background: transparent;
    color: var(--text-muted);
    border-radius: 8px;
    cursor: pointer;
}

/* Toast */
.toast-container {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    max-width: 360px;
}
.toast {
    padding: 1rem 1.125rem;
    border-radius: var(--radius-sm);
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    animation: slideIn 0.25s ease;
    display: flex;
    gap: 0.75rem;
    align-items: flex-start;
}
.toast.success { border-left: 4px solid var(--success); }
.toast.error { border-left: 4px solid var(--danger); }
.toast.info { border-left: 4px solid var(--primary); }
@keyframes slideIn {
    from { opacity: 0; transform: translateX(12px); }
    to { opacity: 1; transform: translateX(0); }
}

/* Loading */
.loading-overlay {
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.35);
    display: grid;
    place-items: center;
    z-index: 9998;
}
.loading-overlay[hidden] { display: none !important; }
.loading-spinner {
    width: 44px;
    height: 44px;
    border: 3px solid rgba(255,255,255,0.35);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Error page */
.error-page {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 2rem;
}
.error-card {
    text-align: center;
    max-width: 420px;
}
.error-code {
    font-size: 4rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1;
}

/* Responsive */
@media (max-width: 1200px) {
    .stats-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 900px) {
    .dashboard-grid { grid-template-columns: 1fr; }
    .dashboard-toolbar { align-items: stretch; }
    .dashboard-filter { width: 100%; }
    .search-box { display: none; }
}
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        box-shadow: var(--shadow-lg);
    }
    .sidebar.open { transform: translateX(0); }
    .app-main { margin-left: 0 !important; }
    .mobile-menu { display: grid; }
    .sidebar-toggle { display: none; }
    .stats-grid { grid-template-columns: 1fr; }
    .app-content { padding: 1rem; }
}