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

body {
    background: #f0f2f5;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    background: #2c3e50;
    color: white;
    padding: 15px 20px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

header .logo-container {
    display: flex;
    align-items: center;
}

header img {
    height: 40px;
    margin-right: 10px;
}

header h1 {
    font-size: 24px;
}

header .admin-link {
    margin-left: auto;
}

header .admin-link a {
    background: #3498db;
    color: white;
    padding: 8px 15px;
    border-radius: 4px;
    text-decoration: none;
    transition: background 0.3s;
}

header .admin-link a:hover {
    background: #2980b9;
}

.login-box, .admin-box, .upload-box {
    background: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    max-width: 400px;
    margin: 50px auto;
}

form input, form select {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    border: 1px solid #ddd;
    border-radius: 4px;
}

form input[type="submit"] {
    background: #3498db;
    color: white;
    border: none;
    cursor: pointer;
    transition: background 0.3s;
}

form input[type="submit"]:hover {
    background: #2980b9;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

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

th {
    background: #34495e;
    color: white;
}

tr:hover {
    background: #f8f9fa;
}

a {
    color: #3498db;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.button {
    display: inline-block;
    padding: 8px 15px;
    background: #e74c3c;
    color: white;
    border-radius: 4px;
    margin: 5px;
}

.button:hover {
    background: #c0392b;
    text-decoration: none;
}

.success {
    color: #27ae60;
    margin: 10px 0;
}

.error {
    color: #e74c3c;
    margin: 10px 0;
}