:root {
    --bg-color: #f4f7f6;
    --card-bg: #fff;
    --text-color: #333;
    --text-secondary: #666;
    --border-color: #ddd;
    --primary-color: #00695c;
    --primary-hover: #004d40;
    --th-bg: #f8f9fa;
    --tr-hover: #f1f1f1;
}

[data-theme="dark"] {
    --bg-color: #121212;
    --card-bg: #1e1e1e;
    --text-color: #e0e0e0;
    --text-secondary: #aaaaaa;
    --border-color: #333;
    --primary-color: #00897b;
    --primary-hover: #00695c;
    --th-bg: #2c2c2c;
    --tr-hover: #2a2a2a;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
}

.top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 30px;
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.logo {
    color: var(--primary-color);
    font-size: 20px;
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 8px 16px;
    border-radius: 20px;
    cursor: pointer;
    font-weight: 600;
    transition: 0.2s;
}

.btn-outline:hover {
    background: var(--tr-hover);
}

.container {
    max-width: 1000px;
    margin: 40px auto;
    padding: 20px;
    width: 100%;
}

.hidden {
    display: none !important;
}

.card {
    background: var(--card-bg);
    border-radius: 8px;
    padding: 30px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    border: 1px solid var(--border-color);
}

#login-container {
    max-width: 400px;
    margin-top: 60px;
}

h2 {
    margin-bottom: 20px;
    color: var(--primary-color);
}

.input-group {
    margin-bottom: 15px;
}

.input-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
}

.input-group input {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-color);
    color: var(--text-color);
    border-radius: 4px;
}

.btn {
    width: 100%;
    padding: 10px;
    background-color: var(--primary-color);
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
}

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

.btn-secondary {
    background-color: #d32f2f;
    width: auto;
    padding: 8px 16px;
}

.btn-secondary:hover {
    background-color: #b71c1c;
}

.error {
    color: #d32f2f;
    margin-top: 10px;
    font-size: 14px;
}

.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

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

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

th, td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    background-color: var(--th-bg);
    font-weight: 600;
}

tr:hover {
    background-color: var(--tr-hover);
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    .container {
        margin: 20px auto;
        padding: 15px;
    }
    .top-bar {
        padding: 15px 20px;
    }
    .card {
        padding: 20px;
    }
    th, td {
        padding: 10px;
        font-size: 14px;
    }
}