* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #f5f7fa;
    color: #1f2937;
}

.container {
    max-width: 900px;
    margin: 60px auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 40px;
}

header h1 {
    font-size: 42px;
    margin-bottom: 10px;
}

header p {
    color: #6b7280;
}

.review-box {
    background: white;
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.06);
}

label {
    display: block;
    margin-bottom: 10px;
    font-weight: bold;
}

.input-row {
    display: flex;
    gap: 10px;
}

input {
    flex: 1;
    padding: 14px;
    border: 1px solid #d1d5db;
    border-radius: 8px;
    font-size: 15px;
}

button {
    padding: 14px 22px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: bold;
    background: #111827;
    color: white;
}

button:hover {
    background: #374151;
}

.error {
    color: #dc2626;
    margin-top: 10px;
}

.result {
    margin-top: 25px;
}

.score-card {
    display: flex;
    gap: 20px;
}

.score-card > div {
    flex: 1;
    background: white;
    padding: 25px;
    border-radius: 12px;
    text-align: center;
}

.score-card span {
    display: block;
    color: #6b7280;
    margin-bottom: 10px;
}

.score-card strong {
    font-size: 32px;
}

.section {
    background: white;
    margin-top: 20px;
    padding: 25px;
    border-radius: 12px;
}

.signal {
    padding: 15px;
    margin-bottom: 10px;
    border-left: 4px solid #f59e0b;
    background: #fffbeb;
    border-radius: 5px;
}

.signal strong {
    display: block;
    margin-bottom: 5px;
}

.signal small {
    color: #6b7280;
}

.loading {
    text-align: center;
    margin-top: 25px;
    color: #6b7280;
}

.hidden {
    display: none;
}

@media (max-width: 700px) {

    .input-row {
        flex-direction: column;
    }

    .score-card {
        flex-direction: column;
    }
}