/*
Theme Name: DIYONE Corporate
Description: DIYONEコーポレートサイト専用テーマ
Version: 1.0.0
Author: DIYONE
*/

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

body {
    font-family: 'Helvetica Neue', Arial, 'Hiragino Sans', 'Yu Gothic', sans-serif;
    line-height: 1.6;
    color: #333;
    overflow-x: hidden;
}

/* ヘッダー */
.site-header {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 1rem 0;
    transition: all 0.3s ease;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.logo {
    display: flex;
    align-items: center;
    font-size: 1.8rem;
    font-weight: bold;
    color: #333;
    text-decoration: none;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: #333;
    margin-right: 10px;
    border-radius: 5px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-menu a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-menu a:hover {
    color: #FFD700;
}

.cta-button {
    background: linear-gradient(135deg, #FFD700, #FFA500);
    color: white !important;
    padding: 0.8rem 1.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: bold;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0 4px 15px rgba(255, 215, 0, 0.3);
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 215, 0, 0.4);
}

/* モバイルメニュー */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: #333;
    margin: 3px 0;
    transition: 0.3s;
}

.mobile-menu-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: rgba(0, 0, 0, 0.8);
    z-index: 9999;
}

.mobile-menu {
    position: absolute;
    top: 0;
    right: 0;
    width: 300px;
    height: 100vh;
    background: white;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    padding: 2rem;
    position: relative;
    padding-top: 4rem;
}

.mobile-menu-overlay.active .mobile-menu {
    transform: translateX(0);
}

.mobile-nav-menu {
    list-style: none;
    padding-top: 1rem;
}

.mobile-nav-menu li {
    margin-bottom: 1.5rem;
}

.mobile-nav-menu a {
    color: #333;
    text-decoration: none;
    font-weight: 500;
    font-size: 1.1rem;
}

.mobile-cta-button {
    background: linear-gradient(135deg, #FFD700, #FFA500);
    color: white !important;
    padding: 0.8rem 1.5rem;
    border-radius: 50px;
    display: inline-block;
    margin-top: 1rem;
}

.mobile-menu-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    padding: 0.5rem;
    line-height: 1;
    color: #333;
}

.mobile-menu-close:hover {
    color: #FFD700;
}

/* メインビジュアル */
.hero {
    height: 100vh;
    background: 
        linear-gradient(135deg, rgba(255, 215, 0, 0.1) 0%, rgba(255, 165, 0, 0.1) 100%),
        linear-gradient(45deg, #f8f9fa 0%, #ffffff 50%, #e9ecef 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: #333;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 200 200"><defs><pattern id="creative-pattern" width="40" height="40" patternUnits="userSpaceOnUse"><circle cx="10" cy="10" r="2" fill="%23FFD700" opacity="0.3"/><rect x="25" y="5" width="8" height="8" fill="%23FFA500" opacity="0.2" rx="2"/><polygon points="35,25 40,35 30,35" fill="%23FFD700" opacity="0.3"/></pattern></defs><rect width="200" height="200" fill="url(%23creative-pattern)"/></svg>');
    opacity: 0.6;
    animation: creativePulse 20s ease-in-out infinite;
}

@keyframes creativePulse {
    0%, 100% { transform: translate(0, 0) scale(1); opacity: 0.4; }
    50% { transform: translate(-10px, -10px) scale(1.05); opacity: 0.8; }
}

.hero-content {
    max-width: 800px;
    z-index: 2;
    position: relative;
    padding: 2rem;
}

.hero h1 {
    font-size: 3.8rem;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, #333 0%, #FFD700 50%, #FFA500 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 800;
    line-height: 1.2;
}

.hero p {
    font-size: 1.3rem;
    margin-bottom: 2.5rem;
    color: #666;
    font-weight: 400;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: #FFA500;
    margin-bottom: 1.5rem;
    font-weight: 600;
    letter-spacing: 1px;
}

/* セクション共通 */
.section {
    padding: 5rem 0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: #333;
}

.section-subtitle {
    text-align: center;
    font-size: 1.1rem;
    color: #666;
    margin-bottom: 3rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* サービス */
.services {
    background: #f8f9fa;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.service-card {
    background: white;
    border-radius: 15px;
    overflow: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    cursor: pointer;
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(255, 215, 0, 0.2);
}

.service-header {
    padding: 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
    border-bottom: 1px solid rgba(255, 215, 0, 0.1);
}

.service-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.service-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #FFD700, #FFA500);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.3rem;
}

.service-title {
    font-size: 1.3rem;
    font-weight: bold;
    color: #333;
}

.service-toggle {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: linear-gradient(135deg, #FFD700, #FFA500);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
    font-weight: bold;
    transition: transform 0.3s ease;
}

.service-card.active .service-toggle {
    transform: rotate(45deg);
}

.service-content {
    padding: 0 2rem;
    max-height: 0;
    overflow: hidden;
    transition: all 0.4s ease;
}

.service-card.active .service-content {
    max-height: 300px;
    padding: 2rem;
}

.service-description {
    color: #666;
    line-height: 1.6;
    margin-bottom: 1rem;
}

.service-features {
    list-style: none;
    padding: 0;
}

.service-features li {
    padding: 0.3rem 0;
    color: #666;
    position: relative;
    padding-left: 1.2rem;
}

.service-features li:before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #FFD700;
    font-weight: bold;
}

/* 制作フロー */
.workflow {
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 50%, #f1f3f4 100%);
    position: relative;
    overflow: hidden;
}

.workflow::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 30% 70%, rgba(255, 215, 0, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 70% 30%, rgba(255, 165, 0, 0.05) 0%, transparent 50%);
    animation: float 12s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 0.7; }
}

.workflow-container {
    position: relative;
    z-index: 2;
}

.workflow-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    margin-top: 4rem;
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
}

.workflow-item {
    background: rgba(255, 255, 255, 0.9);
    border: 2px solid rgba(255, 215, 0, 0.2);
    border-radius: 20px;
    padding: 2rem 1.5rem;
    text-align: center;
    position: relative;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.workflow-item:hover {
    transform: translateY(-8px);
    border-color: rgba(255, 215, 0, 0.5);
    box-shadow: 0 15px 35px rgba(255, 215, 0, 0.15);
}

.workflow-step {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 30px;
    height: 30px;
    background: linear-gradient(135deg, #FFD700, #FFA500);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    font-size: 0.9rem;
}

.workflow-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #FFD700, #FFA500);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 1rem auto;
    color: white;
    font-size: 1.5rem;
}

.workflow-item h4 {
    font-size: 1.2rem;
    margin-bottom: 0.8rem;
    color: #333;
    font-weight: bold;
}

.workflow-item p {
    color: #666;
    font-size: 0.9rem;
    line-height: 1.5;
}

.workflow-arrow {
    position: absolute;
    top: 50%;
    right: -1rem;
    transform: translateY(-50%);
    color: #FFD700;
    font-size: 1.5rem;
    z-index: 3;
}

.workflow-item:last-child .workflow-arrow {
    display: none;
}

/* 強み */
.strengths {
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 50%, #f1f3f4 100%);
    color: #333;
    position: relative;
    overflow: hidden;
}

.strengths::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(255, 215, 0, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 165, 0, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(255, 215, 0, 0.05) 0%, transparent 50%);
    animation: float 15s ease-in-out infinite;
}

.strengths-container {
    position: relative;
    z-index: 2;
}

.strengths .section-title {
    color: #333;
    font-weight: 700;
}

.strengths-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2.5rem;
    margin-top: 4rem;
}

.strength-item {
    background: rgba(255, 255, 255, 0.9);
    border: 2px solid rgba(255, 215, 0, 0.2);
    border-radius: 24px;
    padding: 3rem 2.5rem;
    text-align: center;
    position: relative;
    transition: all 0.4s ease;
    backdrop-filter: blur(20px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.strength-item:hover {
    transform: translateY(-12px) scale(1.02);
    border-color: rgba(255, 215, 0, 0.6);
    box-shadow: 0 20px 60px rgba(255, 215, 0, 0.2);
}

.strength-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 6px;
    background: linear-gradient(90deg, #FFD700, #FFA500, #FFD700);
    border-radius: 24px 24px 0 0;
    background-size: 200% 100%;
    animation: shimmer 3s ease-in-out infinite;
}

@keyframes shimmer {
    0%, 100% { background-position: 200% 0; }
    50% { background-position: -200% 0; }
}

.strength-number {
    font-size: 4.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, #FFD700 0%, #FFA500 50%, #FF8C00 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: block;
    margin-bottom: 1.5rem;
    filter: drop-shadow(0 4px 8px rgba(255, 215, 0, 0.3));
}

.strength-item h3 {
    font-size: 1.6rem;
    margin-bottom: 1.2rem;
    color: #333;
    font-weight: 600;
}

.strength-item p {
    color: #666;
    line-height: 1.8;
    font-size: 1rem;
}

/* お客様の声 */
.testimonials {
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 50%, #f1f3f4 100%);
    position: relative;
}

.testimonials::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 0 100 100"><defs><pattern id="quote-pattern" width="50" height="50" patternUnits="userSpaceOnUse"><text x="25" y="35" font-family="Arial" font-size="30" text-anchor="middle" fill="%23FFD700" opacity="0.1">"</text></pattern></defs><rect width="100" height="100" fill="url(%23quote-pattern)"/></svg>');
    opacity: 0.3;
}

.testimonials .container {
    position: relative;
    z-index: 2;
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 4rem;
}

.testimonial-item {
    background: white;
    padding: 2rem;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    position: relative;
}

.testimonial-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(255, 215, 0, 0.15);
}

.testimonial-content {
    margin-bottom: 2rem;
    position: relative;
}

.quote {
    font-size: 4rem;
    color: #FFD700;
    position: absolute;
    top: -1rem;
    left: -0.5rem;
    font-family: serif;
    opacity: 0.3;
}

.testimonial-content p {
    color: #333;
    line-height: 1.8;
    font-style: italic;
    margin-left: 2rem;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.author-avatar {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    overflow: hidden;
    flex-shrink: 0;
}

.author-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.author-info .author-name {
    font-weight: bold;
    color: #333;
    margin-bottom: 0.2rem;
}

.author-info .author-company {
    color: #666;
    font-size: 0.9rem;
    margin-bottom: 0.3rem;
}

.author-info .author-service {
    background: linear-gradient(135deg, #FFD700, #FFA500);
    color: white;
    padding: 0.2rem 0.8rem;
    border-radius: 12px;
    font-size: 0.8rem;
    display: inline-block;
}

/* Give & Take */
.give-take {
    background: #fafafa;
    position: relative;
}

.give-take-hero {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    color: #333;
    padding: 4rem 2rem;
    border-radius: 20px;
    text-align: center;
    position: relative;
    overflow: hidden;
    border: 2px solid rgba(255, 215, 0, 0.1);
}

.give-take-hero::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 0 100 100"><defs><pattern id="platform-pattern" width="30" height="30" patternUnits="userSpaceOnUse"><rect x="5" y="5" width="20" height="15" rx="2" fill="rgba(255,215,0,0.05)"/><circle cx="8" cy="8" r="1" fill="rgba(255,215,0,0.1)"/><circle cx="22" cy="22" r="1" fill="rgba(255,215,0,0.1)"/></pattern></defs><rect width="100" height="100" fill="url(%23platform-pattern)"/></svg>');
    opacity: 0.4;
}

.give-take-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    margin: 0 auto;
}

.give-take-hero h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    font-weight: 800;
    color: #333;
}

.give-take-hero .subtitle {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    color: #666;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

.coming-soon-badge {
    background: #FFD700;
    color: #333;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: bold;
}

.give-take-hero p {
    font-size: 1.1rem;
    margin-bottom: 3rem;
    color: #666;
    line-height: 1.7;
}

.give-take-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.feature-item {
    text-align: center;
}

.feature-icon {
    width: 50px;
    height: 50px;
    background: rgba(255, 215, 0, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    color: #333;
    font-size: 1.3rem;
}

.feature-title {
    font-weight: bold;
    margin-bottom: 0.5rem;
    color: #333;
}

.feature-desc {
    font-size: 0.9rem;
    color: #666;
}

.give-take-hero .cta-button {
    background: linear-gradient(135deg, #FFD700, #FFA500);
    color: white;
    padding: 1rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: bold;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(255, 215, 0, 0.3);
    display: inline-block;
}

.give-take-hero .cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 215, 0, 0.4);
}

/* お問い合わせ */
.contact {
    background: #f8f9fa;
}

.contact-form {
    max-width: 600px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: bold;
    color: #333;
}

.required {
    color: #FF6B6B;
    font-weight: bold;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 1rem;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: #FFD700;
}

.privacy-policy {
    margin-top: 2rem;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: white;
    border-radius: 10px;
    border: 1px solid #e0e0e0;
}

.privacy-policy h4 {
    margin-bottom: 1rem;
    color: #333;
}

.privacy-policy-content {
    max-height: 200px;
    overflow-y: auto;
    margin-bottom: 1rem;
    padding: 1rem;
    background: #f8f9fa;
    border-radius: 5px;
    font-size: 0.9rem;
    line-height: 1.6;
    color: #666;
}

.privacy-checkbox {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    margin-top: 1rem;
}

.privacy-checkbox input[type="checkbox"] {
    margin-top: 0.2rem;
    width: auto;
}

.privacy-checkbox label {
    font-weight: normal;
    font-size: 0.9rem;
    line-height: 1.5;
}

.form-submit {
    background: linear-gradient(135deg, #FFD700, #FFA500);
    color: white;
    padding: 1rem 2rem;
    border: none;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    transition: transform 0.3s ease;
    width: 100%;
}

.form-submit:hover {
    transform: translateY(-2px);
}

.form-submit:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* 会社概要 */
.company {
    background: white;
}

.company-info {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    padding: 3rem;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.company-table {
    width: 100%;
    border-collapse: collapse;
}

.company-table th,
.company-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid #e0e0e0;
}

.company-table th {
    background: #f8f9fa;
    font-weight: bold;
    color: #333;
    width: 30%;
}

/* フッター */
.site-footer {
    background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
    color: white;
    padding: 3rem 0 1rem;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-logo-link {
    display: flex;
    align-items: center;
    font-size: 1.8rem;
    font-weight: bold;
    color: white;
    text-decoration: none;
    margin-bottom: 1rem;
}

.footer-logo-icon {
    width: 40px;
    height: 40px;
    background: #FFD700;
    margin-right: 10px;
    border-radius: 5px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #333;
    font-weight: bold;
}

.footer-description {
    color: #ccc;
    line-height: 1.6;
}

.footer-nav {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.footer-nav-column h4 {
    color: #FFD700;
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.footer-nav-column ul {
    list-style: none;
}

.footer-nav-column li {
    margin-bottom: 0.5rem;
}

.footer-nav-column a {
    color: #ccc;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-nav-column a:hover {
    color: #FFD700;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #444;
    color: #ccc;
}

.footer-credit {
    margin-top: 0.5rem;
    font-size: 0.9rem;
    opacity: 0.8;
}

/* 上に戻るボタン */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #FFD700, #FFA500);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    text-decoration: none;
    font-size: 1.2rem;
    box-shadow: 0 4px 15px rgba(255, 215, 0, 0.3);
    transition: all 0.3s ease;
    opacity: 0;
    transform: translateY(20px);
    z-index: 1000;
}

.back-to-top.visible {
    opacity: 1;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 20px rgba(255, 215, 0, 0.4);
}

/* アニメーション */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* スクリーンリーダー用の非表示クラス */
.sr-only {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}

.sr-only-focusable:focus {
    position: static !important;
    width: auto !important;
    height: auto !important;
    padding: 0.5rem 1rem !important;
    margin: 0 !important;
    overflow: visible !important;
    clip: auto !important;
    white-space: normal !important;
    background: #000 !important;
    color: #fff !important;
    text-decoration: none !important;
    z-index: 100000 !important;
}

/* レスポンシブデザイン */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .mobile-menu-overlay {
        display: block;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .hero p {
        font-size: 1.1rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .services-grid {
        grid-template-columns: 1fr;
    }

    .workflow-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .workflow-arrow {
        top: auto;
        bottom: -1.5rem;
        right: 50%;
        transform: translateX(50%) rotate(90deg);
    }

    .workflow-item:last-child .workflow-arrow {
        display: none;
    }

    .testimonials-grid {
        grid-template-columns: 1fr;
    }

    .testimonial-content p {
        margin-left: 1rem;
    }

    .give-take-features {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .give-take-hero h2 {
        font-size: 2rem;
    }

    .give-take-hero .subtitle {
        flex-direction: column;
        gap: 0.5rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .footer-nav {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .container {
        padding: 0 1rem;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 2rem;
    }

    .workflow-grid {
        gap: 2rem;
    }

    .workflow-item {
        padding: 1.5rem 1rem;
    }
}