body {
    margin: 0;
    font-family: 'Segoe UI', sans-serif;
    background: #f4f6f8;
}

/* HEADER */
header {
    background: #2e7d32;
    color: white;
    padding: 15px;
    text-align: center;
    position: sticky;
    top: 0;
    z-index: 1000;
}

/* NAVBAR */
nav {
    margin-top: 10px;
}

nav a {
    color: white;
    margin: 0 10px;
    text-decoration: none;
    font-weight: bold;
    transition: 0.3s;
}

nav a:hover {
    color: #c8e6c9;
}

/* CONTAINER */
.container {
    max-width: 600px;
    margin: 25px auto;
    background: white;
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.center {
    text-align: center;
}

/* TEXT */
.container p {
    line-height: 1.6;
    color: #555;
}

/* BUTTON */
.btn, button {
    display: inline-block;
    padding: 12px;
    background: #2e7d32;
    color: white;
    border-radius: 8px;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: 0.3s;
}

button {
    width: 100%;
    margin-top: 15px;
}

.btn:hover, button:hover {
    background: #1b5e20;
}

/* GEJALA */
.gejala {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.gejala label {
    padding: 12px;
    background: #f9f9f9;
    border-radius: 8px;
    cursor: pointer;
    transition: 0.2s;
}

.gejala label:hover {
    background: #e8f5e9;
}

/* HASIL */
#hasil {
    margin-top: 20px;
    padding: 15px;
    background: #e8f5e9;
    border-radius: 10px;
}

/* KONTAK */
.kontak-box {
    background: #f9f9f9;
    padding: 15px;
    border-radius: 10px;
    margin-top: 10px;
}

/* MOBILE */
@media (max-width: 600px) {
    .container {
        margin: 10px;
        padding: 15px;
    }

    nav a {
        display: inline-block;
        margin: 5px;
    }
}