:root {
    --primary-color: #004a99;
    --accent-color: #e60012;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-color: #1e293b;
    --border-color: #e2e8f0;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', 'Noto Sans JP', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

header {
    text-align: center;
    margin-bottom: 2rem;
}

h1 {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.subtitle {
    font-weight: 600;
    color: #64748b;
}

.update-info {
    font-size: 0.85rem;
    color: #94a3b8;
    margin-top: 0.25rem;
}

.input-card,
.result-card,
.info-section {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
}

h2 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-color);
    color: var(--primary-color);
}

.form-group {
    margin-bottom: 1.25rem;
}

label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

select,
input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    background-color: #fff;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

@media (max-width: 600px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}

.button-group {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 1rem;
}

.primary-btn {
    padding: 1rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: background-color 0.2s;
}

.primary-btn:hover {
    background-color: #003366;
}

.setting-group-bottom {
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    color: #64748b;
}

.setting-group-bottom .checkbox-wrapper {
    background: transparent;
    border: none;
    padding: 0;
    justify-content: flex-end;
}

.secondary-btn {
    padding: 1rem;
    background-color: #e2e8f0;
    color: #475569;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
}

.secondary-btn:hover {
    background-color: #cbd5e1;
}

.result-card {
    background-color: #f0f7ff;
    border-left: 6px solid var(--primary-color);
}

.result-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    text-align: center;
}

.result-item span {
    display: block;
    font-size: 0.85rem;
    color: #64748b;
}

.result-item strong {
    font-size: 1.2rem;
    color: var(--text-color);
}

.result-item.highlight strong {
    color: var(--accent-color);
    font-size: 1.5rem;
}

.info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.info-item h3 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    color: #475569;
}

.info-item p {
    font-size: 0.9rem;
    background: #f1f5f9;
    padding: 0.5rem;
    border-radius: 4px;
}

.checkbox-wrapper {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: #fff;
    font-size: 0.9rem;
}

.checkbox-wrapper input {
    width: auto;
}

.hidden {
    display: none;
}

.placeholder-text {
    grid-column: span 2;
    text-align: center;
    color: #94a3b8;
    font-style: italic;
}

footer {
    text-align: center;
    font-size: 0.8rem;
    color: #94a3b8;
    margin-top: 2rem;
}