/* CSS for layout and styling */
:root {
    --primary-color: #005ab3;
    --secondary-color: #e9f2fa;
    --border-color: #b0c4de;
    --text-color: #333;
    --header-bg: #f8f9fa;
}
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
    line-height: 1.6;
    background-color: #f4f7f9;
    color: var(--text-color);
    margin: 0;
    padding: 15px;
}
.container {
    max-width: 800px;
    margin: 15px auto;
    padding: 20px;
    background-color: #fff;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    border: 1px solid var(--border-color);
}
h1 {
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 10px;
    font-size: 24px;
}
.description {
    text-align: center;
    margin-bottom: 25px;
    color: #666;
    font-size: 14px;
}
.input-form {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    margin-bottom: 25px;
    padding: 20px;
    background-color: var(--secondary-color);
    border-radius: 8px;
}
.input-mode-selector {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px 20px;
}
.mode-label {
    display: flex;
    align-items: center;
    gap: 5px;
    cursor: pointer;
}
.input-group-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 15px;
    min-height: 50px;
}
.input-group {
    display: flex;
    flex-wrap: nowrap;
    align-items: center;
    gap: 8px;
}
.input-form label {
    font-weight: bold;
    flex-shrink: 0;
}
.input-form select,
.input-form input[type="number"],
.input-form input[type="date"] {
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-size: 16px;
    font-family: inherit;
    text-align: center;
}
.input-form .year-input {
    width: 80px;
}
.input-form .month-day-input {
    width: 50px;
}
.input-form input[type="date"] {
    min-width: 200px;
    text-align: left;
}

.calc-button {
    width: 100%;
    max-width: 400px;
    padding: 10px 25px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    font-weight: bold;
    transition: background-color 0.3s ease;
}
.calc-button:hover {
    background-color: #004488;
}
#result-area {
    margin-top: 20px;
}
#result-area h2 {
    color: var(--primary-color);
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 5px;
    text-align: center;
    margin-bottom: 20px;
}
.table-wrapper {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}
.result-table {
    width: 100%;
    min-width: 500px;
    border-collapse: collapse;
    text-align: center;
}
.result-table th, .result-table td {
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    white-space: nowrap;
}
.result-table thead th {
    background-color: var(--header-bg);
    font-weight: bold;
    position: sticky;
    top: 0;
}
.result-table tbody tr:nth-child(even) {
    background-color: var(--secondary-color);
}
.result-table .school-col {
    text-align: left;
    font-weight: bold;
}
.year-jp {
    font-size: 0.9em;
    color: #555;
    margin-left: 5px;
}
.error-message {
    color: #d9534f;
    text-align: center;
    margin-top: 15px;
    font-weight: bold;
}

@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    h1 {
        font-size: 22px;
    }
    .input-group-container {
        flex-direction: column;
        gap: 15px;
    }
    .result-table th, .result-table td {
        padding: 10px 12px;
    }
}

/* ===== NEW: Footer Styles ===== */
footer {
    text-align: center;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid #ddd;
    font-size: 14px;
    color: #666;
}

footer a {
    color: var(--primary-color);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}