:root {
    --primary: #2c3e50;
    --secondary: #3498db;
    --bg: #f4f7f6;
    --text: #333;
    --error: #e74c3c;
    --success: #2ecc71;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    margin: 0;
    padding: 0;
}

.auth-body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.login-container {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    width: 300px;
}

input, select, button {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
}

button {
    background-color: var(--secondary);
    color: white;
    border: none;
    cursor: pointer;
    font-weight: bold;
}

button:hover {
    background-color: #2980b9;
}

header {
    background-color: var(--primary);
    color: white;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header button {
    width: auto;
    background-color: var(--error);
}

main {
    padding: 2rem;
    max-width: 1000px;
    margin: 0 auto;
}

.controls {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

th, td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

th {
    background-color: #f8f9fa;
}

.positive { color: var(--success); }
.negative { color: var(--error); }
.hidden { display: none; }
.error { color: var(--error); background: #fadbd8; padding: 10px; border-radius: 4px; text-align: center; }
.loading { text-align: center; padding: 20px; font-style: italic; }