/* スマートフォン - 小 */
@media (max-width: 576px) {
    :root {
        --font-xl: 2rem;
        --font-lg: 1.6rem;
        --font-md: 1.4rem;
        --spacing-section: 60px;
    }
    
    .container {
        padding: 0 15px;
    }
    
    .hero {
        padding: 120px 0 60px;
    }
    
    .hero p {
        font-size: 0.9rem;
    }
    
    .btn {
        padding: 10px 20px;
    }
    
    .case-studies-grid {
        grid-template-columns: 1fr;
    }
    
    .logo img {
        height: 45px;
    }
    
    .cta-buttons {
        flex-direction: column;
        gap: 15px;
        align-items: center;
    }
    
    .cta-buttons .btn {
        width: 100%;
        max-width: 300px;
    }
    
    .contact-form {
        padding: 20px 15px;
    }
}

/* スマートフォン - 中~大、タブレット - 小 */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        height: 100%;
        background-color: var(--primary-color);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        transition: 0.3s;
        z-index: 999;
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .nav-menu li {
        margin: var(--spacing-lg) 0;
    }
    
    .nav-menu a {
        color: white;
    }
    
    .nav-menu a:hover {
        color: white;
        opacity: 0.8;
    }
    
    .nav-menu .contact-link a {
        background-color: white;
        color: var(--primary-color);
        padding: 10px 25px;
    }
    
    .nav-menu .contact-link a:hover {
        background-color: rgba(255, 255, 255, 0.9);
        color: var(--primary-dark);
    }
    
    .nav-toggle {
        display: block;
        z-index: 1000;
    }
    
    .nav-toggle span {
        display: block;
        width: 25px;
        height: 3px;
        background-color: var(--primary-color);
        margin: 5px 0;
        transition: var(--transition);
    }
    
    .problems-grid, 
    .features, 
    .use-cases-grid, 
    .case-studies-grid, 
    .process-grid, 
    .pricing-cards {
        grid-template-columns: 1fr;
    }
    
    .pricing-card {
        max-width: 400px;
        margin: 0 auto;
    }
    
    h1 br, p br {
        display: none;
    }
    
    .text-center {
        margin-top: var(--spacing-lg);
    }
    
    .process-table-container::before {
        display: none;
    }
    
    .process-table {
        display: block;
        border-spacing: 0;
    }
    
    .process-table tr {
        display: flex;
        flex-direction: column;
    }
    
    .process-table td {
        width: 100%;
        margin-bottom: 20px;
    }
    
    .process-step {
        min-height: auto;
    }
    
    .process-step:after {
        display: none;
    }
    
    .step-number {
        margin-bottom: 10px;
    }
    
    .cta-title {
        font-size: 1.8rem;
    }
    
    .cta-text {
        font-size: 1rem;
    }
    
    .form-row {
        grid-template-columns: 1fr;
        gap: 0;
    }
}

/* タブレット - 中~大、デスクトップ - 小 */
@media (min-width: 769px) and (max-width: 992px) {
    .problems-grid, 
    .features, 
    .use-cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .pricing-cards {
        grid-template-columns: repeat(2, 1fr);
        max-width: 800px;
        margin: 50px auto 0;
    }
}

/* デスクトップ - 中~大 */
@media (min-width: 993px) {
    .pricing-cards {
        grid-template-columns: repeat(2, 1fr);
        max-width: 900px;
        margin: 50px auto 0;
    }
}

/* プロセステーブルのレスポンシブ対応 */
@media (max-width: 992px) {
    .process-table-container {
        padding: 20px 0;
    }
    
    .process-table {
        border-spacing: 10px 0;
    }
    
    .process-step {
        min-height: 280px;
        padding: 15px;
    }
    
    .step-number {
        width: 40px;
        height: 40px;
        font-size: 1.3rem;
    }
    
    .process-step h3 {
        font-size: 1.1rem;
    }
    
    .process-step p {
        font-size: 0.9rem;
    }
    
    .cta-title {
        font-size: 2.2rem;
    }
    
    .cta-text {
        font-size: 1.1rem;
    }
    
    .contact-container {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .contact-info {
        max-width: 600px;
        margin: 0 auto;
    }
}

/* CTAセクションとお問い合わせフォームのレスポンシブ対応 */
@media (max-width: 992px) {
    .cta-title {
        font-size: 2.2rem;
    }
    
    .cta-text {
        font-size: 1.1rem;
    }
    
    .contact-container {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .contact-info {
        max-width: 600px;
        margin: 0 auto;
    }
}

@media (max-width: 768px) {
    .cta-title {
        font-size: 1.8rem;
    }
    
    .cta-text {
        font-size: 1rem;
    }
    
    .form-row {
        grid-template-columns: 1fr;
        gap: 0;
    }
}

@media (max-width: 576px) {
    .cta-buttons {
        flex-direction: column;
        gap: 15px;
        align-items: center;
    }
    
    .cta-buttons .btn {
        width: 100%;
        max-width: 300px;
    }
    
    .contact-form {
        padding: 20px 15px;
    }
}