@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    --primary: #0052a3;
    --primary-dark: #003d7a;
    --primary-light: #0068d1;
    --primary-gradient: linear-gradient(135deg, #003d7a 0%, #0068d1 100%);
    --accent: #00b4d8;
    --accent-light: #48cae4;
    --bg: #f0f4f8;
    --bg-card: #ffffff;
    --text: #1a2332;
    --text-muted: #5a6776;
    --text-light: #8896a6;
    --border: #e2e8f0;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
    --radius: 12px;
    --radius-sm: 8px;
    --sidebar-width: 260px;
    --header-height: 64px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: 'Inter', -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.6;
}

/* ====== SIDEBAR ====== */
.sidebar {
    position: fixed;
    left: 0; top: 0; bottom: 0;
    width: var(--sidebar-width);
    background: var(--primary-gradient);
    color: #fff;
    z-index: 100;
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease;
    box-shadow: 4px 0 20px rgba(0,0,0,0.15);
}

.sidebar-brand {
    padding: 20px 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid rgba(255,255,255,0.12);
}

.sidebar-brand .brand-icon {
    width: 42px; height: 42px;
    background: rgba(255,255,255,0.15);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    backdrop-filter: blur(4px);
}

.sidebar-brand .brand-text {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.sidebar-brand .brand-sub {
    font-size: 11px;
    opacity: 0.7;
    font-weight: 400;
}

.sidebar-nav {
    flex: 1;
    padding: 16px 12px;
    overflow-y: auto;
}

.nav-section {
    margin-bottom: 8px;
}

.nav-section-title {
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    opacity: 0.5;
    padding: 12px 16px 6px;
    font-weight: 600;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 11px 16px;
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s ease;
    margin-bottom: 2px;
}

.nav-link:hover {
    background: rgba(255,255,255,0.12);
    color: #fff;
    transform: translateX(4px);
}

.nav-link.active {
    background: rgba(255,255,255,0.2);
    color: #fff;
    font-weight: 600;
    box-shadow: inset 3px 0 0 var(--accent);
}

.nav-link .nav-icon {
    font-size: 18px;
    width: 24px;
    text-align: center;
    opacity: 0.9;
}

.sidebar-footer {
    padding: 16px 20px;
    border-top: 1px solid rgba(255,255,255,0.12);
    font-size: 12px;
    opacity: 0.7;
}

.sidebar-footer .sync-status {
    display: flex;
    align-items: center;
    gap: 6px;
}

.sync-dot {
    width: 8px; height: 8px;
    border-radius: 50%;
    background: var(--success);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

/* ====== HEADER ====== */
.main-header {
    position: fixed;
    top: 0;
    left: var(--sidebar-width);
    right: 0;
    height: var(--header-height);
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 28px;
    z-index: 90;
    box-shadow: var(--shadow-sm);
}

.header-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.header-user {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 6px 14px;
    background: var(--bg);
    border-radius: 24px;
    font-size: 13px;
    font-weight: 500;
}

.header-user .user-avatar {
    width: 32px; height: 32px;
    background: var(--primary-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 14px;
    font-weight: 600;
}

.btn-logout {
    background: none;
    border: 1px solid var(--border);
    padding: 7px 16px;
    border-radius: 20px;
    font-size: 13px;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.btn-logout:hover {
    border-color: var(--danger);
    color: var(--danger);
}

/* ====== MAIN CONTENT ====== */
.main-content {
    margin-left: var(--sidebar-width);
    margin-top: var(--header-height);
    padding: 28px;
    min-height: calc(100vh - var(--header-height));
}

/* ====== CARDS ====== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-bottom: 28px;
}

.stat-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.stat-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 4px;
}

.stat-card.blue::before { background: var(--primary-gradient); }
.stat-card.green::before { background: linear-gradient(135deg, #059669, #10b981); }
.stat-card.orange::before { background: linear-gradient(135deg, #d97706, #f59e0b); }
.stat-card.cyan::before { background: linear-gradient(135deg, #0891b2, #06b6d4); }
.stat-card.purple::before { background: linear-gradient(135deg, #7c3aed, #a78bfa); }
.stat-card.red::before { background: linear-gradient(135deg, #dc2626, #ef4444); }

.stat-icon {
    width: 48px; height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    margin-bottom: 16px;
}

.stat-card.blue .stat-icon { background: rgba(0,82,163,0.1); color: var(--primary); }
.stat-card.green .stat-icon { background: rgba(16,185,129,0.1); color: var(--success); }
.stat-card.orange .stat-icon { background: rgba(245,158,11,0.1); color: var(--warning); }
.stat-card.cyan .stat-icon { background: rgba(0,180,216,0.1); color: var(--accent); }
.stat-card.purple .stat-icon { background: rgba(124,58,237,0.1); color: #7c3aed; }
.stat-card.red .stat-icon { background: rgba(239,68,68,0.1); color: var(--danger); }

.stat-label {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 4px;
    font-weight: 500;
}

.stat-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.5px;
}

.stat-sub {
    font-size: 12px;
    color: var(--text-light);
    margin-top: 4px;
}

/* ====== PANELS ====== */
.panel {
    background: var(--bg-card);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
    margin-bottom: 24px;
    overflow: hidden;
}

.panel-header {
    padding: 18px 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.panel-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 10px;
}

.panel-body {
    padding: 24px;
}

/* ====== TABLES ====== */
.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th {
    background: var(--bg);
    padding: 12px 16px;
    text-align: left;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 2px solid var(--border);
}

.data-table td {
    padding: 12px 16px;
    font-size: 14px;
    border-bottom: 1px solid var(--border);
    color: var(--text);
}

.data-table tbody tr {
    transition: background 0.15s;
}

.data-table tbody tr:hover {
    background: rgba(0,82,163,0.03);
}

.data-table .text-right { text-align: right; }
.data-table .text-center { text-align: center; }

.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
}

.badge-success { background: rgba(16,185,129,0.12); color: #059669; }
.badge-danger { background: rgba(239,68,68,0.12); color: #dc2626; }
.badge-warning { background: rgba(245,158,11,0.12); color: #d97706; }
.badge-info { background: rgba(0,180,216,0.12); color: #0891b2; }

/* ====== CHART CONTAINER ====== */
.chart-container {
    position: relative;
    height: 350px;
    width: 100%;
}

.charts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
    gap: 24px;
    margin-bottom: 24px;
}

/* ====== FILTERS ====== */
.filter-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.filter-input, .filter-select {
    padding: 9px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-family: inherit;
    background: var(--bg-card);
    color: var(--text);
    transition: border-color 0.2s;
}

.filter-input:focus, .filter-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0,82,163,0.1);
}

.btn {
    padding: 9px 20px;
    border-radius: var(--radius-sm);
    border: none;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-family: inherit;
}

.btn-primary {
    background: var(--primary-gradient);
    color: #fff;
}

.btn-primary:hover {
    box-shadow: 0 4px 12px rgba(0,82,163,0.3);
    transform: translateY(-1px);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-muted);
}

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
}

/* ====== LOGIN PAGE ====== */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-gradient);
    position: relative;
    overflow: hidden;
}

.login-page::before {
    content: '';
    position: absolute;
    width: 600px; height: 600px;
    background: rgba(255,255,255,0.05);
    border-radius: 50%;
    top: -200px; right: -200px;
}

.login-page::after {
    content: '';
    position: absolute;
    width: 400px; height: 400px;
    background: rgba(255,255,255,0.03);
    border-radius: 50%;
    bottom: -100px; left: -100px;
}

.login-card {
    background: var(--bg-card);
    border-radius: 20px;
    padding: 48px 40px;
    width: 420px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    z-index: 1;
    animation: slideUp 0.6s ease;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

.login-logo {
    text-align: center;
    margin-bottom: 32px;
}

.login-logo .logo-icon {
    width: 64px; height: 64px;
    background: var(--primary-gradient);
    border-radius: 16px;
    margin: 0 auto 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    color: #fff;
    box-shadow: 0 8px 24px rgba(0,82,163,0.3);
}

.login-logo h1 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text);
}

.login-logo p {
    color: var(--text-muted);
    font-size: 14px;
    margin-top: 4px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-family: inherit;
    transition: all 0.2s;
    background: var(--bg);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(0,82,163,0.1);
    background: #fff;
}

.btn-login {
    width: 100%;
    padding: 14px;
    background: var(--primary-gradient);
    color: #fff;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    font-family: inherit;
}

.btn-login:hover {
    box-shadow: 0 6px 20px rgba(0,82,163,0.4);
    transform: translateY(-2px);
}

.validation-error {
    color: var(--danger);
    font-size: 13px;
    margin-top: 8px;
}

/* ====== PAGINATION ====== */
.pagination {
    display: flex;
    gap: 4px;
    justify-content: center;
    margin-top: 20px;
}

.pagination a, .pagination span {
    padding: 8px 14px;
    border-radius: 6px;
    font-size: 13px;
    text-decoration: none;
    color: var(--text-muted);
    border: 1px solid var(--border);
    transition: all 0.2s;
}

.pagination a:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.pagination .active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

/* ====== EMPTY STATE ====== */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-light);
}

.empty-state .empty-icon {
    font-size: 48px;
    margin-bottom: 16px;
    opacity: 0.4;
}

.empty-state h3 {
    font-size: 18px;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.empty-state p {
    font-size: 14px;
}

/* ====== RESPONSIVE ====== */
.sidebar-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    color: var(--text);
    cursor: pointer;
    padding: 4px 8px;
}

@media (max-width: 992px) {
    .sidebar {
        transform: translateX(-100%);
    }
    .sidebar.open {
        transform: translateX(0);
    }
    .main-content {
        margin-left: 0;
    }
    .main-header {
        left: 0;
    }
    .sidebar-toggle {
        display: block;
    }
    .sidebar-overlay {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0,0,0,0.5);
        z-index: 99;
    }
    .sidebar-overlay.show {
        display: block;
    }
    .stats-grid {
        grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    }
    .charts-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 576px) {
    .login-card {
        width: 95%;
        padding: 32px 24px;
    }
    .main-content {
        padding: 16px;
    }
    .stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: 12px;
    }
    .stat-card {
        padding: 16px;
    }
    .stat-value {
        font-size: 22px;
    }
}