:root {
    --primary: #25D366;
    --primary-dark: #128C7E;
    --sidebar-bg: #1a202c;
    --sidebar-text: #a0aec0;
    --sidebar-active: #25D366;
    --sidebar-width: 250px;
    --topbar-height: 60px;
    --bg: #f7fafc;
    --card-bg: #ffffff;
    --text: #2d3748;
    --text-muted: #718096;
    --border: #e2e8f0;
    --danger: #e53e3e;
    --warning: #dd6b20;
    --success: #25D366;
    --info: #3182ce;
    --radius: 8px;
    --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
}

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

body {
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
}

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

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 100;
    transition: transform 0.3s;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

.sidebar-logo {
    width: 180px;
    height: auto;
    filter: brightness(0) invert(1);
}

.sidebar-nav {
    list-style: none;
    padding: 12px 0;
    flex: 1;
}

.sidebar-nav li a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    color: var(--sidebar-text);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.15s;
    border-left: 3px solid transparent;
}

.sidebar-nav li a:hover {
    background: rgba(255,255,255,0.05);
    color: #fff;
}

.sidebar-nav li.active a {
    color: var(--sidebar-active);
    background: rgba(37,211,102,0.08);
    border-left-color: var(--sidebar-active);
}

.sidebar-nav li.active a svg {
    stroke: var(--sidebar-active);
}

.sidebar-footer {
    padding: 16px 20px;
    border-top: 1px solid rgba(255,255,255,0.08);
    font-size: 12px;
    color: rgba(255,255,255,0.3);
}

/* Main content */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-height: 100vh;
}

.topbar {
    height: var(--topbar-height);
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    padding: 0 24px;
    gap: 16px;
    position: sticky;
    top: 0;
    z-index: 50;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text);
}

.page-title {
    font-size: 18px;
    font-weight: 600;
}

.content-area {
    padding: 24px;
}

/* Cards */
.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 24px;
    margin-bottom: 20px;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.card-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
}

/* Stats grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 16px;
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.stat-icon.green { background: rgba(37,211,102,0.1); color: var(--primary); }
.stat-icon.blue { background: rgba(49,130,206,0.1); color: var(--info); }
.stat-icon.orange { background: rgba(221,107,32,0.1); color: var(--warning); }
.stat-icon.red { background: rgba(229,62,62,0.1); color: var(--danger); }

.stat-info h3 {
    font-size: 28px;
    font-weight: 700;
    line-height: 1.1;
}

.stat-info p {
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 2px;
}

/* Tables */
.table-container {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

thead th {
    text-align: left;
    padding: 12px 16px;
    font-weight: 600;
    color: var(--text-muted);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 2px solid var(--border);
    white-space: nowrap;
}

tbody td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
    vertical-align: middle;
}

tbody tr:hover {
    background: rgba(0,0,0,0.02);
}

/* Badges */
.badge {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}

.badge-green { background: rgba(37,211,102,0.1); color: #22543d; }
.badge-red { background: rgba(229,62,62,0.1); color: #9b2c2c; }
.badge-blue { background: rgba(49,130,206,0.1); color: #2a4365; }
.badge-orange { background: rgba(221,107,32,0.1); color: #7b341e; }
.badge-gray { background: rgba(160,174,192,0.1); color: #4a5568; }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    border: 1px solid var(--border);
    background: var(--card-bg);
    color: var(--text);
    text-decoration: none;
    transition: all 0.15s;
}

.btn:hover { background: var(--bg); }
.btn-primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-primary:hover { background: var(--primary-dark); }
.btn-danger { background: var(--danger); color: #fff; border-color: var(--danger); }
.btn-danger:hover { opacity: 0.9; }
.btn-sm { padding: 4px 10px; font-size: 13px; }

/* Forms */
.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--text);
}

.form-control {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 14px;
    font-family: inherit;
    color: var(--text);
    background: var(--card-bg);
    transition: border-color 0.15s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37,211,102,0.15);
}

select.form-control {
    appearance: auto;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

/* Modal */
.modal-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 200;
    align-items: center;
    justify-content: center;
}

.modal-backdrop.show {
    display: flex;
}

.modal {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    padding: 24px;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.modal-title {
    font-size: 18px;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-muted);
    line-height: 1;
}

/* Filters bar */
.filters {
    display: flex;
    gap: 12px;
    align-items: center;
    flex-wrap: wrap;
    margin-bottom: 16px;
}

.filters .form-control {
    width: auto;
    min-width: 160px;
}

/* Empty state */
.empty-state {
    text-align: center;
    padding: 48px 24px;
    color: var(--text-muted);
}

.empty-state svg { margin-bottom: 12px; opacity: 0.4; }
.empty-state p { font-size: 15px; }

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }
    .sidebar.open {
        transform: translateX(0);
    }
    .main-content {
        margin-left: 0;
    }
    .menu-toggle {
        display: block;
    }
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .form-row {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
    .content-area {
        padding: 16px;
    }
}

/* Utilities */
.text-muted { color: var(--text-muted); }
.text-right { text-align: right; }
.text-center { text-align: center; }
.mt-2 { margin-top: 8px; }
.mt-4 { margin-top: 16px; }
.mb-4 { margin-bottom: 16px; }
.flex { display: flex; }
.gap-2 { gap: 8px; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }