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

:root {
    --primary-dark: #0a3a5c;
    --primary-medium: #1456a8;
    --primary-light: #2b7ec9;
    --accent-light: #d4e8f7;
    --text-dark: #1a2a3a;
    --text-light: #6b7a8a;
    --border-color: #c0d4e4;
    --success: #2ecc71;
    --error: #e74c3c;
    --warning: #f39c12;
}

body {
    font-family: 'Noto Sans JP', sans-serif;
    background: linear-gradient(135deg, #0a3a5c 0%, #1456a8 50%, #2b7ec9 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    color: var(--text-dark);
}

.container {
    width: 100%;
    max-width: 500px;
}

.card {
    background: white;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(10, 58, 92, 0.3);
    padding: 50px 40px;
    animation: slideUp 0.6s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.logo {
    font-family: 'Playfair Display', serif;
    font-size: 32px;
    font-weight: 700;
    background: linear-gradient(135deg, #0a3a5c 0%, #1456a8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 12px;
}

.subtitle {
    color: var(--text-light);
    font-size: 14px;
    margin-bottom: 30px;
    line-height: 1.6;
}

.form-group {
    margin-bottom: 24px;
}

label {
    display: block;
    font-weight: 500;
    color: var(--text-dark);
    margin-bottom: 8px;
    font-size: 14px;
    letter-spacing: 0.5px;
}

.required {
    color: var(--error);
    margin-left: 4px;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="date"] {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 14px;
    transition: all 0.3s ease;
    background: #f8fbfe;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus,
input[type="date"]:focus {
    outline: none;
    border-color: var(--primary-light);
    background: white;
    box-shadow: 0 0 0 3px rgba(43, 126, 201, 0.1);
}

.info-text {
    display: block;
    font-size: 12px;
    color: var(--text-light);
    margin-top: 6px;
    line-height: 1.5;
}

.password-requirements {
    background: #f0f5fa;
    border-left: 3px solid var(--primary-light);
    padding: 12px 16px;
    border-radius: 4px;
    font-size: 12px;
    color: var(--text-dark);
    margin-top: 8px;
    line-height: 1.6;
}

.password-requirements strong {
    color: var(--primary-dark);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.checkbox-group {
    background: #f8fbfe;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 24px;
}

.checkbox-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 12px;
}

.checkbox-item:last-child {
    margin-bottom: 0;
}

input[type="checkbox"] {
    width: 20px;
    height: 20px;
    min-width: 20px;
    margin-top: 2px;
    margin-right: 12px;
    cursor: pointer;
    accent-color: var(--primary-light);
    border-radius: 4px;
}

.checkbox-label {
    display: flex;
    flex-direction: column;
    cursor: pointer;
    flex: 1;
}

.checkbox-label span {
    font-size: 14px;
    color: var(--text-dark);
    margin-bottom: 2px;
    font-weight: 500;
}

.checkbox-label a {
    color: var(--primary-light);
    text-decoration: none;
    font-size: 13px;
    transition: color 0.3s ease;
}

.checkbox-label a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

.info-box {
    background: #fef5e7;
    border-left: 4px solid var(--warning);
    padding: 12px 16px;
    border-radius: 4px;
    font-size: 12px;
    color: #8b6914;
    margin-bottom: 24px;
    line-height: 1.6;
}

.info-box strong {
    color: #5d4a0a;
}

.button-group {
    display: flex;
    gap: 12px;
    margin-top: 32px;
}

button {
    flex: 1;
    padding: 14px 24px;
    border: none;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    font-family: 'Noto Sans JP', sans-serif;
    cursor: pointer;
    transition: all 0.3s ease;
    letter-spacing: 0.5px;
}

.btn-submit {
    background: linear-gradient(135deg, var(--primary-medium) 0%, var(--primary-light) 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(20, 86, 168, 0.3);
}

.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(20, 86, 168, 0.4);
}

.btn-submit:active {
    transform: translateY(0);
}

.btn-cancel {
    background: white;
    color: var(--text-dark);
    border: 2px solid var(--border-color);
}

.btn-cancel:hover {
    border-color: var(--primary-light);
    color: var(--primary-light);
    background: #f0f5fa;
}

.footer-text {
    text-align: center;
    margin-top: 28px;
    font-size: 13px;
    color: var(--text-light);
}

.footer-text a {
    color: var(--primary-light);
    text-decoration: none;
    font-weight: 500;
}

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

.error-message {
    color: var(--error);
    font-size: 12px;
    margin-top: 6px;
    display: none;
}

.form-group.error input {
    border-color: var(--error);
    background: #fff5f5;
}

.form-group.error .error-message {
    display: block;
}

/* スマートフォン対応 */
@media (max-width: 600px) {
    .card {
        padding: 32px 24px;
        border-radius: 12px;
    }

    .logo {
        font-size: 28px;
    }

    .form-row {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    label {
        font-size: 13px;
    }

    input[type="text"],
    input[type="email"],
    input[type="password"],
    input[type="date"] {
        padding: 11px 14px;
        font-size: 16px;
    }

    .button-group {
        flex-direction: column-reverse;
        gap: 10px;
        margin-top: 24px;
    }

    button {
        padding: 12px 20px;
        font-size: 14px;
    }

    .checkbox-group {
        padding: 14px;
    }

    .checkbox-item {
        margin-bottom: 14px;
    }

    .info-box {
        font-size: 11px;
        padding: 10px 14px;
    }

    .password-requirements {
        font-size: 11px;
        padding: 10px 14px;
    }

    .subtitle {
        font-size: 13px;
    }

    .footer-text {
        font-size: 12px;
        margin-top: 24px;
    }
}

.success-message {
    display: none;
    background: #d4edda;
    border: 2px solid var(--success);
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 24px;
    color: #155724;
    font-size: 14px;
    text-align: center;
    font-weight: 500;
}

.success-message.show {
    display: block;
    animation: slideDown 0.4s ease-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}