* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Segoe UI", Arial;
}

body {
    background: #0f172a;
    color: #e2e8f0;
}

/* NAV */
nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    padding: 12px;
    background: #020617;
    border-bottom: 1px solid #1e293b;
}

nav a {
    color: #94a3b8;
    text-decoration: none;
    padding: 8px 12px;
    border-radius: 8px;
}

nav a:hover {
    background: #1e293b;
    color: white;
}

nav a.active {
    background: #2563eb;
    color: white;
}

/* CONTAINER */
.container {
    max-width: 900px;
    margin: auto;
    padding: 20px;
}

/* CARD */
.card {
    background: #1e293b;
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 15px;
}

/* BUTTON */
button {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 8px;
    background: #2563eb;
    color: white;
    cursor: pointer;
}

button:hover {
    background: #1d4ed8;
}

/* TEST */
.question {
    background: #0f172a;
    padding: 15px;
    border-radius: 12px;
    margin-bottom: 15px;
}

.option {
    display: flex;
    justify-content: space-between;
    padding: 12px;
    margin-top: 8px;
    background: #1e293b;
    border-radius: 10px;
    cursor: pointer;
}

.option input {
    display: none;
}

.box {
    width: 18px;
    height: 18px;
    border: 2px solid #94a3b8;
    border-radius: 4px;
}

.option input:checked + .box {
    background: #22c55e;
    border-color: #22c55e;
}

/* STATS */
.bar {
    width: 100%;
    height: 18px;
    background: #1e293b;
    border-radius: 8px;
    overflow: hidden;
    margin: 10px 0;
}

#fill {
    height: 100%;
    width: 0%;
    background: #22c55e;
}