/* Reset & Base */
* {
    box_sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    background-color: #f4f4f4;
    color: #333;
}

a {
    text-decoration: none;
    color: #333;
}

ul {
    list-style: none;
}

/* Navbar */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: #333;
    color: #fff;
    padding: 1rem 2rem;
}

.navbar .brand {
    font-size: 1.5rem;
    font-weight: bold;
}

.navbar ul {
    display: flex;
}

.navbar ul li {
    margin-left: 20px;
}

.navbar ul li a {
    color: #fff;
    padding: 8px 12px;
    border-radius: 4px;
    transition: background 0.3s;
}

.navbar ul li a:hover {
    background-color: #555;
}

/* Forms */
.form-container {
    max-width: 500px;
    margin: 2rem auto;
    padding: 2rem;
    background: #fff;
    border-radius: 5px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
}

.form-control {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
}

.invalid-feedback {
    display: block;
    color: #dc3545;
    font-size: 0.9em;
    margin-top: 5px;
}

.btn {
    display: inline-block;
    background: #333;
    color: #fff;
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
}

.btn-block {
    display: block;
    width: 100%;
}

.btn:hover {
    background: #555;
    color: #fff;
}