body {
    font-family: Arial, sans-serif;
    background: linear-gradient(135deg, #0f172a, #0b7a75);
    margin: 0;
    padding: 0;
    color: #0f172a;
}

.navbar {
    background: linear-gradient(90deg, #0b7a75, #2563eb);
    color: #f9fafb;
    padding: 10px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
}

.navbar-brand {
    display: flex;
    align-items: center;
}

.navbar-logo {
    height: 32px;
    margin-right: 10px;
}

.navbar-title {
    font-weight: 700;
    letter-spacing: 0.04em;
}

.navbar a {
    color: #e5f3ff;
    margin-left: 15px;
    text-decoration: none;
    font-weight: 500;
}

.navbar a:hover {
    text-decoration: underline;
}

.container {
    max-width: 900px;
    margin: 30px auto;
    padding: 0 15px;
}

.card {
    background: #ffffff;
    padding: 24px;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.18);
}

.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 5px;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"],
.form-group input[type="number"] {
    width: 100%;
    padding: 8px 10px;
    border-radius: 6px;
    border: 1px solid #d1d5db;
    box-sizing: border-box;
}

button {
    background: linear-gradient(90deg, #0b7a75, #2563eb);
    border: none;
    color: white;
    padding: 10px 18px;
    border-radius: 999px;
    cursor: pointer;
    font-weight: 600;
}

button:hover {
    background: linear-gradient(90deg, #0a5e5a, #1d4ed8);
}

.alert {
    padding: 10px 12px;
    border-radius: 6px;
    margin-bottom: 15px;
}

.alert-danger {
    background-color: #fee2e2;
    color: #b91c1c;
}

.alert-success {
    background-color: #dcfce7;
    color: #166534;
}

.nav-user {
    margin-right: 10px;
    opacity: 0.9;
}