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

:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --bg-color: #f3f4f6;
    --sidebar-bg: #111827;
    --sidebar-text: #9ca3af;
    --sidebar-text-hover: #f3f4f6;
    --card-bg: #ffffff;
    --text-main: #1f2937;
    --text-muted: #6b7280;
    --border-color: #e5e7eb;
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --warning: #f59e0b;
    --warning-hover: #d97706;
    --success: #10b981;
    --success-hover: #059669;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background-color: var(--sidebar-bg);
    color: var(--sidebar-text);
    display: flex;
    flex-direction: column;
    transition: all 0.3s ease;
}

.sidebar-header {
    padding: 24px 20px;
    font-size: 1.5rem;
    font-weight: 700;
    color: #fff;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    letter-spacing: 1px;
}

.sidebar-menu {
    list-style: none;
    padding: 20px 0;
    flex: 1;
}

.sidebar-menu li {
    margin-bottom: 5px;
}

.sidebar-menu a {
    display: flex;
    align-items: center;
    padding: 12px 20px;
    color: var(--sidebar-text);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.2s;
}

.sidebar-menu a:hover, .sidebar-menu a.active {
    background-color: rgba(255,255,255,0.05);
    color: var(--sidebar-text-hover);
    border-left: 4px solid var(--primary);
}

.sidebar-menu a svg {
    margin-right: 12px;
    width: 20px;
    height: 20px;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* Topbar */
.topbar {
    height: 70px;
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 30px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.topbar-user {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logout-btn {
    color: var(--danger);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
}

/* Page Content */
.content-area {
    padding: 30px;
    overflow-y: auto;
    flex: 1;
}

.page-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 24px;
    color: var(--text-main);
}

/* Cards & Tables */
.card {
    background-color: var(--card-bg);
    border-radius: 8px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    padding: 24px;
    margin-bottom: 24px;
}

.table-responsive {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th {
    background-color: #f9fafb;
    color: var(--text-muted);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 12px 24px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

td {
    padding: 16px 24px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-main);
    font-size: 0.875rem;
}

tr:hover td {
    background-color: #f9fafb;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 16px;
    border-radius: 6px;
    font-weight: 500;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    border: none;
}

.btn-primary { background-color: var(--primary); color: white; }
.btn-primary:hover { background-color: var(--primary-hover); transform: translateY(-1px); }

.btn-danger { background-color: var(--danger); color: white; }
.btn-danger:hover { background-color: var(--danger-hover); transform: translateY(-1px); }

.btn-warning { background-color: var(--warning); color: white; }
.btn-warning:hover { background-color: var(--warning-hover); transform: translateY(-1px); }

.btn-success { background-color: var(--success); color: white; }
.btn-success:hover { background-color: var(--success-hover); transform: translateY(-1px); }

.btn-secondary { background-color: var(--text-muted); color: white; }
.btn-secondary:hover { background-color: #4b5563; transform: translateY(-1px); }

.btn-sm { padding: 6px 12px; font-size: 0.75rem; }

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-main);
    font-size: 0.875rem;
}

.form-control {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.875rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

textarea.form-control {
    resize: vertical;
    min-height: 100px;
}

/* Alerts */
.alert {
    padding: 12px 16px;
    border-radius: 6px;
    margin-bottom: 20px;
    font-size: 0.875rem;
}

.alert-success { background-color: #d1fae5; color: #065f46; border: 1px solid #a7f3d0; }
.alert-danger { background-color: #fee2e2; color: #991b1b; border: 1px solid #fecaca; }

/* Login Page specific */
.login-body {
    background-color: var(--sidebar-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
}

.login-card {
    background-color: var(--card-bg);
    width: 100%;
    max-width: 400px;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.5);
}

.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.login-header h1 {
    font-size: 1.75rem;
    color: var(--text-main);
    margin-bottom: 8px;
}

/* Mobile Responsive */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-main);
}
.mobile-menu-btn svg {
    width: 28px;
    height: 28px;
}

@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: -260px;
        top: 0;
        bottom: 0;
        z-index: 9999;
    }
    .sidebar.active {
        left: 0;
        box-shadow: 5px 0 15px rgba(0,0,0,0.5);
    }
    .mobile-menu-btn {
        display: block;
    }
    .d-flex {
        flex-direction: column !important;
    }
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .sidebar-overlay {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0,0,0,0.5);
        z-index: 9998;
        display: none;
    }
    .sidebar-overlay.active {
        display: block;
    }
    
    .topbar {
        padding: 0 15px;
    }
    
    .content-area {
        padding: 15px;
    }
    
    .card {
        padding: 15px;
    }
}