/* リセット & ベーススタイル */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2c3e50;
    --primary-dark: #1a252f;
    --accent-color: #3498db;
    --text-color: #2c3e50;
    --text-light: #7f8c8d;
    --bg-color: #ffffff;
    --bg-light: #fafbfc;
    --bg-dark: #1a252f;
    --border-color: #e1e8ed;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.12);
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

/* パフォーマンス最適化 */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, 'Noto Sans JP', sans-serif;
    line-height: 1.7;
    color: var(--text-color);
    background-color: var(--bg-color);
    font-weight: 400;
    letter-spacing: 0.01em;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ナビゲーション */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo a {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-color);
    text-decoration: none;
    letter-spacing: 0.05em;
    transition: color 0.2s ease;
}

.logo a:hover {
    color: var(--primary-color);
}

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

.nav-link {
    color: var(--text-light);
    text-decoration: none;
    font-weight: 400;
    font-size: 0.95rem;
    transition: color 0.2s ease;
    position: relative;
}

.nav-link:hover {
    color: var(--text-color);
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--text-color);
    transition: all 0.3s ease;
}

/* ヒーローセクション */
.hero {
    position: relative;
    min-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: left;
    padding: 140px 20px 100px;
    background: var(--bg-color);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('images/hero-background.jpg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    opacity: 0.4;
    z-index: 0;
}

.hero-background::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(255, 255, 255, 0.05);
    z-index: 1;
}

.hero-background::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.85) 0%, rgba(255, 255, 255, 0.75) 100%);
    z-index: 2;
}

.hero-wrapper {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    width: 100%;
    max-width: 800px;
    position: relative;
    z-index: 2;
}

.hero-content {
    width: 100%;
}


.photo-placeholder-small {
    width: 100%;
    height: 180px;
    background-color: var(--bg-light);
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    font-size: 0.875rem;
    margin-bottom: 1.5rem;
}

.reason-photo-1 .photo-placeholder-small {
    background-image: url('images/reason-1.jpg?v=20241204');
    background-size: cover;
    background-position: center;
    border: none;
}

.reason-photo-1 .photo-placeholder-small span {
    display: none;
}

.reason-photo-2 .photo-placeholder-small {
    background-image: url('images/reason-2.jpg?v=20241204');
    background-size: cover;
    background-position: center;
    border: none;
}

.reason-photo-2 .photo-placeholder-small span {
    display: none;
}

.reason-photo-3 .photo-placeholder-small {
    background-image: url('images/reason-3.jpg?v=20241204');
    background-size: cover;
    background-position: center;
    border: none;
}

.reason-photo-3 .photo-placeholder-small span {
    display: none;
}

.reason-photo-4 .photo-placeholder-small {
    background-image: url('images/reason-4.jpg?v=20241204');
    background-size: cover;
    background-position: center;
    border: none;
}

.reason-photo-4 .photo-placeholder-small span {
    display: none;
}

.photo-placeholder-medium {
    width: 100%;
    height: 200px;
    background-color: var(--bg-light);
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    font-size: 0.875rem;
    text-align: center;
    margin-bottom: 1.5rem;
}

.testimonial-photo-1 .photo-placeholder-medium {
    background-image: url('images/testimonial-1.jpg?v=20241204');
    background-size: cover;
    background-position: center;
    border: none;
}

.testimonial-photo-1 .photo-placeholder-medium span {
    display: none;
}

.testimonial-photo-2 .photo-placeholder-medium {
    background-image: url('images/testimonial-2.jpg?v=20241204');
    background-size: cover;
    background-position: center;
    border: none;
}

.testimonial-photo-2 .photo-placeholder-medium span {
    display: none;
}

.testimonial-photo-3 .photo-placeholder-medium {
    background-image: url('images/testimonial-3.jpg?v=20241204');
    background-size: cover;
    background-position: center;
    border: none;
}

.testimonial-photo-3 .photo-placeholder-medium span {
    display: none;
}

.photo-placeholder-large {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--bg-light);
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    font-size: 0.875rem;
    text-align: center;
    padding: 2rem;
}

.photo-placeholder-large p {
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.photo-placeholder-large span {
    font-size: 0.75rem;
}


.reason-photo {
    margin-bottom: 1rem;
}

.testimonial-photo {
    margin-bottom: 1.5rem;
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 2rem;
    line-height: 1.4;
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.125rem);
    color: var(--text-light);
    margin-bottom: 3rem;
    line-height: 1.8;
    font-weight: 400;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

/* ボタン */
.btn {
    display: inline-block;
    padding: 0.875rem 2.25rem;
    border-radius: 4px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.2s ease;
    border: none;
    cursor: pointer;
    font-size: 0.95rem;
    letter-spacing: 0.02em;
}

.btn-primary {
    background-color: var(--text-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-dark);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--bg-light);
    border-color: var(--text-color);
}

.btn-large {
    padding: 1.125rem 2.5rem;
    font-size: 1rem;
}

/* セクション共通スタイル */
section {
    padding: 100px 0;
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.25rem);
    font-weight: 600;
    text-align: center;
    margin-bottom: 1.5rem;
    color: var(--text-color);
    letter-spacing: -0.02em;
    line-height: 1.3;
}

.section-subtitle {
    text-align: center;
    color: var(--text-light);
    font-size: 1rem;
    margin-bottom: 4rem;
    line-height: 1.8;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* 導入実績セクション */
.stats-section {
    background-color: var(--bg-light);
    padding: 80px 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 3rem;
    text-align: center;
}

.stat-box {
    padding: 2rem 1rem;
}

.stat-number-large {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 0.75rem;
    letter-spacing: -0.03em;
    line-height: 1;
    white-space: nowrap;
}

.stat-label-large {
    font-size: 1rem;
    color: var(--text-light);
    font-weight: 400;
}

/* 選ばれる理由セクション */
.reasons-section {
    background-color: var(--bg-color);
    padding: 100px 0;
}

.reasons-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2.5rem;
    margin-top: 0;
}

.reason-card {
    padding: 2.5rem;
    background-color: var(--bg-light);
    border-radius: 8px;
    transition: all 0.2s ease;
}

.reason-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    transition: all 0.3s ease;
}

.reason-photo {
    margin-bottom: 1.5rem;
}

.reason-icon {
    font-size: 2rem;
    color: var(--text-color);
    margin-bottom: 1.5rem;
    font-weight: 700;
}

.reason-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-color);
    font-weight: 600;
    letter-spacing: -0.01em;
}

.reason-card p {
    color: var(--text-light);
    line-height: 1.8;
    font-size: 0.95rem;
}

/* お客様の声セクション */
.testimonials-section {
    background-color: var(--bg-light);
    padding: 100px 0;
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2.5rem;
    margin-top: 0;
}

.testimonial-card {
    background-color: white;
    padding: 2.5rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
    transition: all 0.2s ease;
}

.testimonial-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    transition: all 0.3s ease;
}

.testimonial-header {
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.testimonial-company {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

.testimonial-service {
    font-size: 0.875rem;
    color: var(--text-light);
}

.testimonial-text {
    color: var(--text-light);
    line-height: 1.8;
    font-size: 0.95rem;
}

/* 導入事例セクション */
.cases-section {
    background-color: var(--bg-color);
    padding: 100px 0;
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2.5rem;
    margin-top: 0;
}

.case-card {
    background-color: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.case-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.case-photo {
    width: 100%;
    height: 200px;
    overflow: hidden;
    background-color: var(--bg-light);
}

.photo-placeholder-case {
    width: 100%;
    height: 100%;
    background-color: var(--bg-light);
    border: 2px dashed var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    font-size: 0.875rem;
}

.case-photo-1 .photo-placeholder-case {
    background-image: url('images/case-1.jpg?v=20241204');
    background-size: cover;
    background-position: center;
    border: none;
}

.case-photo-1 .photo-placeholder-case span {
    display: none;
}

.case-photo-2 .photo-placeholder-case {
    background-image: url('images/case-2.jpg?v=20241204');
    background-size: cover;
    background-position: center;
    border: none;
}

.case-photo-2 .photo-placeholder-case span {
    display: none;
}

.case-photo-3 .photo-placeholder-case {
    background-image: url('images/case-3.jpg?v=20241204');
    background-size: cover;
    background-position: center;
    border: none;
}

.case-photo-3 .photo-placeholder-case span {
    display: none;
}

.case-content {
    padding: 2rem;
}

.case-category {
    font-size: 0.875rem;
    color: var(--text-light);
    margin-bottom: 0.75rem;
    font-weight: 500;
}

.case-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 1rem;
    letter-spacing: -0.01em;
}

.case-content p {
    color: var(--text-light);
    line-height: 1.8;
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
}

.case-link {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.2s ease;
}

.case-link:hover {
    color: var(--accent-color);
}

/* サービスセクション */
.services {
    background-color: var(--bg-color);
}

.services .container {
    max-width: 900px;
}

.services-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0;
    margin-top: 0;
}

.service-card {
    background-color: transparent;
    padding: 2rem 0;
    border-bottom: 1px solid var(--border-color);
    transition: all 0.2s ease;
    text-align: left;
}

.service-card:last-child {
    border-bottom: none;
}

.service-card:hover {
    border-bottom-color: var(--text-color);
    padding-left: 1rem;
    transition: all 0.3s ease;
}

.service-card-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.service-icon-img {
    width: 64px;
    height: 64px;
    flex-shrink: 0;
    transition: transform 0.3s ease, opacity 0.3s ease;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

.service-card:hover .service-icon-img {
    transform: scale(1.1);
    opacity: 0.9;
}

.service-icon {
    display: none;
}

.service-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0;
    color: var(--text-color);
    font-weight: 600;
    letter-spacing: -0.01em;
}

.service-card-header h3 {
    flex: 1;
}

.service-card p {
    color: var(--text-light);
    line-height: 1.8;
    font-size: 0.95rem;
}

/* 会社概要セクション */
.about {
    background-color: var(--bg-light);
}

.about-content {
    display: flex;
    flex-direction: column;
    max-width: 800px;
    margin: 3rem auto 0;
}

.company-info {
    background-color: white;
    padding: 2.5rem;
    border-radius: 8px;
    margin-bottom: 3rem;
    box-shadow: var(--shadow);
}

.info-row {
    display: grid;
    grid-template-columns: 150px 1fr;
    gap: 1.5rem;
    padding: 1.25rem 0;
    border-bottom: 1px solid var(--border-color);
}

.info-row:last-child {
    border-bottom: none;
}

.info-label {
    font-weight: 600;
    color: var(--text-color);
    font-size: 0.95rem;
}

.info-value {
    color: var(--text-light);
    line-height: 1.8;
    font-size: 0.95rem;
}

.about-message {
    margin-top: 2rem;
}

.about-message h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 1.5rem;
    letter-spacing: -0.01em;
}

.about-message p {
    font-size: 1rem;
    color: var(--text-light);
    line-height: 1.9;
    margin-bottom: 1.5rem;
}


/* お問い合わせセクション */
.contact {
    background-color: var(--bg-color);
}

.contact-form {
    max-width: 600px;
    margin: 0;
    background-color: transparent;
    padding: 0;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-color);
}

.required {
    color: #ef4444;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.875rem 0;
    border: none;
    border-bottom: 1px solid var(--border-color);
    border-radius: 0;
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.2s ease;
    background: transparent;
    color: var(--text-color);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-light);
    opacity: 0.6;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-bottom-color: var(--text-color);
}

.form-group textarea {
    resize: vertical;
}

.form-group select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%232c3e50' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right center;
    padding-right: 1.5rem;
}

.checkbox-group {
    margin-top: 1rem;
}

.checkbox-group label {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    cursor: pointer;
    font-weight: 400;
}

.checkbox-group input[type="checkbox"] {
    width: auto;
    margin-top: 0.25rem;
    cursor: pointer;
}

.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.contact-form .btn {
    margin-top: 2rem;
}

/* FAQセクション */
.faq-section {
    background-color: var(--bg-color);
    padding: 100px 0;
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid var(--border-color);
    padding: 2rem 0;
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: all 0.2s ease;
}

.faq-question:hover h3 {
    color: var(--text-color);
}

.faq-question h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-color);
    margin: 0;
    flex: 1;
    transition: color 0.2s ease;
}

.faq-toggle {
    font-size: 1.5rem;
    font-weight: 300;
    color: var(--text-light);
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s ease;
}

.faq-item.active .faq-toggle {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
    padding: 0;
}

.faq-item.active .faq-answer {
    max-height: 500px;
    padding-top: 1.5rem;
}

.faq-answer p {
    color: var(--text-light);
    line-height: 1.8;
    font-size: 0.95rem;
    margin: 0;
}

/* お知らせセクション */
.news-section {
    background-color: var(--bg-light);
    padding: 100px 0;
}

.news-list {
    max-width: 800px;
    margin: 0 auto;
}

.news-item {
    display: grid;
    grid-template-columns: 150px 1fr;
    gap: 2rem;
    padding: 2rem 0;
    border-bottom: 1px solid var(--border-color);
    transition: all 0.2s ease;
}

.news-item:hover {
    padding-left: 1rem;
}

.news-item:last-child {
    border-bottom: none;
}

.news-date {
    font-size: 0.875rem;
    color: var(--text-light);
    font-weight: 500;
}

.news-content h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

.news-content p {
    color: var(--text-light);
    line-height: 1.8;
    font-size: 0.95rem;
    margin: 0;
}

/* フッター */
.footer {
    background-color: var(--bg-dark);
    color: white;
    padding: 3rem 0 1.5rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 1rem;
    color: white;
}

.footer-section p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.8;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section ul li a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
}

/* レスポンシブデザイン */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: white;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--shadow);
        padding: 2rem 0;
        gap: 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-menu li {
        padding: 1rem 0;
    }

    .section-title {
        text-align: center;
    }
    
    .section-subtitle {
        text-align: center;
    }


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

    .about-stats {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

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

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

    .stat-number-large {
        font-size: clamp(1.8rem, 4vw, 2.5rem);
        white-space: nowrap;
    }

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

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

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

    .news-item {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .news-date {
        font-size: 0.8rem;
    }

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

    .hero-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .stat-number-large {
        font-size: 1.8rem;
        white-space: nowrap;
    }

    .reason-card,
    .testimonial-card {
        padding: 1.5rem;
    }

    .contact-form {
        padding: 1.5rem;
    }
}