* {
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: #f4f5f7;
    color: #1f2933;
    margin: 0;
    padding: 0;
}

.container {
    max-width: 720px;
    margin: 0 auto;
    padding: 40px 20px;
}

header h1 {
    margin-bottom: 4px;
}

.subtitle {
    color: #52606d;
    margin-top: 0;
}

.card {
    background: #fff;
    border-radius: 8px;
    padding: 24px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
    display: flex;
    flex-direction: column;
    gap: 12px;
}

label {
    font-weight: 600;
    margin-top: 8px;
}

input[type="file"],
input[type="number"] {
    padding: 10px;
    border: 1px solid #cbd2d9;
    border-radius: 6px;
    font-size: 1rem;
}

button,
.button {
    background: #2563eb;
    color: #fff;
    border: none;
    border-radius: 6px;
    padding: 12px 18px;
    font-size: 1rem;
    cursor: pointer;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    margin-top: 8px;
}

button:hover,
.button:hover {
    background: #1d4ed8;
}

.link {
    text-align: center;
    margin-top: 8px;
    color: #2563eb;
}

.hint {
    color: #52606d;
    font-size: 0.9rem;
    margin-top: 16px;
}

.alert {
    background: #fef2f2;
    border: 1px solid #fca5a5;
    color: #b91c1c;
    border-radius: 6px;
    padding: 12px 16px;
    margin-bottom: 16px;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 8px;
}

th, td {
    text-align: left;
    padding: 8px;
    border-bottom: 1px solid #e4e7eb;
    font-size: 0.9rem;
}

code {
    background: #e4e7eb;
    padding: 2px 5px;
    border-radius: 4px;
}