body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #f4f4f4;
}

.layout {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.header, .footer {
    background: #333;
    color: #fff;
    padding: 20px;
    text-align: center;
}

.main {
    display: flex;
    flex: 1;
}

.sidebar {
    width: 220px;
    background: #444;
    color: #fff;
    padding: 20px;
    overflow-y: auto;
}

.sidebar nav ul {
    list-style: none;
    padding-left: 0;
}

.sidebar nav ul li {
    margin-bottom: 10px;
}

.sidebar nav ul li a {
    color: #fff;
    text-decoration: none;
}

.sidebar nav ul li a:hover {
    text-decoration: underline;
}

.sidebar details summary {
    cursor: pointer;
    font-weight: bold;
    margin-top: 10px;
}

.sidebar ul {
    list-style: none;
    padding-left: 15px;
}

.sidebar li {
    margin: 5px 0;
}

.sidebar a.file-link {
    color: #fff;
    text-decoration: none;
}

.sidebar a.file-link:hover {
    text-decoration: underline;
}

.content {
    flex: 1;
    background: #fff;
    padding: 20px;
}

#file-viewer {
    padding: 20px;
    background: #fafafa;
    border: 1px solid #ddd;
    min-height: 400px;
}

/* Upload / admin form stilləri */
.admin-form {
    max-width: 600px;
    margin: 0 auto;
}

.admin-form input[type="file"],
.admin-form select {
    width: 100%;
    padding: 8px;
    margin-bottom: 10px;
}

.admin-form button {
    padding: 10px 20px;
    font-size: 16px;
}