:root {
    --primary: #00796b;
    --primary-dark: #004d40;
    --primary-light: #48a999;
    --secondary: #2196f3;
    --accent: #ff9800;
    --success: #4caf50;
    --danger: #f44336;
    --warning: #ffc107;
    --info: #00bcd4;
    --background: #f4f7f6;
    --surface: #ffffff;
    --text-main: #2c3e50;
    --text-muted: #7f8c8d;
    --border: #dcdde1;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --radius: 8px;
    --transition: all 0.3s ease;
}

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

body {
    background-color: var(--background);
    color: var(--text-main);
    line-height: 1.6;
    min-height: 100vh;
}

/* Authentication Screen */
.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
}

.auth-card {
    background: var(--surface);
    padding: 40px;
    border-radius: var(--radius);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
    width: 100%;
    max-width: 400px;
    text-align: center;
}

.auth-logo {
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.auth-logo i {
    font-size: 2.5rem;
}

.auth-subtitle {
    color: var(--text-muted);
    margin-bottom: 30px;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    font-size: 0.9rem;
}

.form-control {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    outline: none;
    transition: var(--transition);
}

.form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0, 121, 107, 0.1);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    width: 100%;
}

.btn-primary {
    background-color: var(--primary);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-dark);
}

/* Dashboard Layout */
.dashboard-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    min-height: 100vh;
}

.sidebar {
    background: var(--primary-dark);
    color: white;
    padding: 20px;
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    padding: 20px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    margin-bottom: 20px;
}

.sidebar-menu {
    list-style: none;
    flex-grow: 1;
}

.sidebar-item {
    margin-bottom: 5px;
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 15px;
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    border-radius: var(--radius);
    transition: var(--transition);
}

.sidebar-link:hover,
.sidebar-link.active {
    background: rgba(255, 255, 255, 0.1);
    color: white;
}

.main-content {
    padding: 30px;
    overflow-y: auto;
}

.top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.page-title {
    font-size: 1.5rem;
    font-weight: 700;
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 10px;
}

/* Cards & Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: var(--surface);
    padding: 20px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 15px;
}

.stat-icon {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.stat-info .stat-value {
    font-size: 1.5rem;
    font-weight: 700;
}

.stat-info .stat-label {
    color: var(--text-muted);
    font-size: 0.9rem;
}

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

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

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
}

th {
    text-align: left;
    padding: 12px;
    border-bottom: 2px solid var(--background);
    color: var(--text-muted);
    font-weight: 600;
}

td {
    padding: 12px;
    border-bottom: 1px solid var(--background);
}

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

.badge {
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 600;
}

.badge-success {
    background: rgba(76, 175, 80, 0.1);
    color: var(--success);
}

.badge-danger {
    background: rgba(244, 67, 54, 0.1);
    color: var(--danger);
}

.badge-warning {
    background: rgba(255, 193, 7, 0.1);
    color: var(--warning);
}

/* Utilities */
.text-right {
    text-align: right;
}

.mt-20 {
    margin-top: 20px;
}

.mb-20 {
    margin-bottom: 20px;
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: none;
    /* Controlled by JS */
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-content {
    background: var(--surface);
    padding: 30px;
    border-radius: var(--radius);
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
}

@media (max-width: 768px) {
    .dashboard-layout {
        grid-template-columns: 1fr;
    }

    .sidebar {
        display: none;
        /* Simple PWA mobile approach later */
    }
}