/* 認証ページ専用スタイル */
.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 40px 20px;
    position: relative;
}

.auth-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"><path fill="%23ffffff" fill-opacity="0.1" d="M0,96L48,112C96,128,192,160,288,160C384,160,480,128,576,122.7C672,117,768,139,864,144C960,149,1056,139,1152,122.7C1248,107,1344,85,1392,74.7L1440,64L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"></path></svg>') bottom center no-repeat;
    background-size: cover;
    opacity: 0.3;
}

.auth-box {
    background: white;
    border-radius: 24px;
    padding: 48px;
    max-width: 480px;
    width: 100%;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    position: relative;
    z-index: 1;
}

.auth-header {
    text-align: center;
    margin-bottom: 32px;
}

.auth-logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 28px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 24px;
}

.auth-logo i {
    font-size: 32px;
}

.auth-header h1 {
    font-size: 32px;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.auth-header p {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.form-group label i {
    font-size: 14px;
    color: var(--primary-color);
}

.form-group input,
.form-group select {
    padding: 14px 16px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 15px;
    font-family: inherit;
    transition: var(--transition);
    background: var(--bg-white);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.1);
}

.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 14px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    user-select: none;
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.checkbox-label span {
    color: var(--text-secondary);
}

.checkbox-label a {
    color: var(--primary-color);
    text-decoration: none;
}

.checkbox-label a:hover {
    text-decoration: underline;
}

.forgot-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.forgot-link:hover {
    text-decoration: underline;
}

.divider {
    position: relative;
    text-align: center;
    margin: 8px 0;
}

.divider::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--border-color);
}

.divider span {
    position: relative;
    background: white;
    padding: 0 16px;
    font-size: 14px;
    color: var(--text-secondary);
}

.social-login {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.btn-social {
    padding: 14px 20px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    background: white;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.btn-social:hover {
    border-color: var(--text-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-google {
    color: #DB4437;
}

.btn-google:hover {
    background: #DB4437;
    color: white;
    border-color: #DB4437;
}

.btn-facebook {
    color: #1877F2;
}

.btn-facebook:hover {
    background: #1877F2;
    color: white;
    border-color: #1877F2;
}

.auth-footer {
    text-align: center;
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
}

.auth-footer p {
    font-size: 14px;
    color: var(--text-secondary);
}

.auth-footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
}

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

.auth-back {
    position: absolute;
    top: 30px;
    left: 30px;
    z-index: 2;
}

.auth-back a {
    color: white;
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    border-radius: 10px;
    transition: var(--transition);
}

.auth-back a:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateX(-4px);
}

/* レスポンシブ */
@media (max-width: 768px) {
    .auth-box {
        padding: 32px 24px;
    }

    .auth-header h1 {
        font-size: 28px;
    }

    .auth-header p {
        font-size: 14px;
    }

    .auth-back {
        top: 20px;
        left: 20px;
    }

    .form-options {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }
}