body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: #f4f7f9;
    color: #333;
    margin: 0;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: auto;
    background: white;
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 2px solid #eee;
    padding-bottom: 15px;
    margin-bottom: 25px;
}

.header h1 { color: #0056b3; margin: 0; }
.header h1 a, .home-link {
    text-decoration: none;
    color: inherit;
}

.logout-btn {
    background-color: #dc3545;
    color: white;
    padding: 8px 15px;
    border-radius: 4px;
    text-decoration: none;
    font-weight: bold;
    transition: background-color 0.2s;
}
.logout-btn:hover { background-color: #c82333; }

/* --- Login Form --- */
.login-container {
    max-width: 400px;
    margin: 50px auto;
    padding: 30px;
    border: 1px solid #ddd;
    border-radius: 8px;
}
.login-container h2 { text-align: center; margin-top: 0; }

/* --- Forms & Inputs --- */
.input-group { margin-bottom: 15px; }
.input-group label { display: block; margin-bottom: 5px; font-weight: bold; }
.input-group input, .input-group select, .input-group textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
    font-family: inherit;
    font-size: 1rem;
}
.input-group textarea { font-family: monospace; }

button {
    padding: 12px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.2s;
}
button:hover { background-color: #0056b3; }

/* --- Feedback Messages --- */
.feedback {
    padding: 15px;
    margin-bottom: 20px;
    border-radius: 5px;
    background-color: #e2e3e5;
    color: #383d41;
    border: 1px solid #d6d8db;
}
.feedback.error {
    background-color: #f8d7da;
    color: #721c24;
    border-color: #f5c6cb;
}

/* --- Admin Panel Layout --- */
.grid-container {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 30px;
}

.product-lines, .unit-management, .editor-container {
    border: 1px solid #e0e0e0;
    padding: 20px;
    border-radius: 5px;
}

h3, h4 {
    margin-top: 0;
    border-bottom: 1px solid #eee;
    padding-bottom: 10px;
}

hr {
    border: none;
    border-top: 1px solid #eee;
    margin: 20px 0;
}

/* --- Item Lists (Lines & Units) --- */
.item-list {
    list-style: none;
    padding: 0;
    margin: 0;
}
.item-list li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
    border-radius: 4px;
    transition: background-color 0.2s;
    margin-bottom: 5px;
}
.item-list li:hover { background-color: #f8f9fa; }
.item-list li.active {
    background-color: #e9f2fa;
    font-weight: bold;
}
.item-list li.active a { color: #0056b3; }

.item-list a {
    text-decoration: none;
    color: #007bff;
    cursor: pointer;
    flex-grow: 1;
}

/* --- Action Buttons --- */
.actions { display: flex; align-items: center; gap: 10px; }
.actions form { margin: 0; }

.delete-btn, .edit-btn {
    text-decoration: none;
    cursor: pointer;
    background: none;
    border: none;
    padding: 5px;
    font-size: 1rem;
}
.delete-btn { color: #dc3545; }
.edit-btn { color: #ffc107; }
.cancel-btn {
    display: inline-block;
    margin-top: 10px;
    color: #6c757d;
    text-decoration: none;
}
.cancel-btn:hover { text-decoration: underline; }