/* 基本設定 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #0066cc;
    --secondary-color: #00a3cc;
    --text-color: #333;
    --text-light: #666;
    --bg-light: #f8f9fa;
    --white: #ffffff;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.15);
}

body {
    font-family: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
    color: var(--text-color);
    line-height: 1.6;
    background-color: var(--white);
}

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

/* ヘッダー */
.header {
    background: var(--white);
    box-shadow: var(--shadow);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: 70px;
    display: flex;
    align-items: center;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo a {
    text-decoration: none;
}

.logo-main {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    display: block;
}

.logo-sub {
    font-size: 0.75rem;
    color: var(--text-light);
    display: block;
}

/* ナビゲーション */
.nav-list {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-list a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s;
    position: relative;
}

.nav-list a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s;
}

.nav-list a:hover::after,
.nav-list a.active::after {
    width: 100%;
}

.nav-list a:hover,
.nav-list a.active {
    color: var(--primary-color);
}

/* ハンバーガーメニュー */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
}

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

/* ヒーローセクション */
.hero {
    height: 600px;
    background: linear-gradient(135deg, #1e3a5f 0%, #0066cc 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--white);
    margin-top: 70px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('https://images.unsplash.com/photo-1497215728101-856f4ea42174?w=1920&q=80') center/cover;
    opacity: 0.3;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    padding: 0 20px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: bold;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

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

/* ボタン */
.btn {
    display: inline-block;
    padding: 1rem 2rem;
    border-radius: 5px;
    text-decoration: none;
    font-weight: bold;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background: #f0f0f0;
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.btn-secondary {
    background: transparent;
    color: var(--white);
    border: 2px solid var(--white);
}

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

.btn-large {
    padding: 1.2rem 3rem;
    font-size: 1.1rem;
}

/* セクション共通 */
.section {
    padding: 80px 0;
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.section-subtitle {
    text-align: center;
    color: var(--text-light);
    font-size: 1.2rem;
    margin-bottom: 3rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* サービスプレビュー */
.services-preview {
    background: var(--bg-light);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.service-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    transition: all 0.3s;
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.service-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    font-weight: bold;
    color: var(--primary-color);
    opacity: 0.8;
}

.service-title {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.service-desc {
    color: var(--text-light);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.service-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: bold;
    transition: color 0.3s;
}

.service-link:hover {
    color: var(--secondary-color);
}

/* 事例プレビュー */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.case-card {
    background: var(--white);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all 0.3s;
}

.case-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.case-image {
    height: 200px;
    overflow: hidden;
}

.case-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s;
}

.case-card:hover .case-image img {
    transform: scale(1.05);
}

.case-content {
    padding: 1.5rem;
}

.case-category {
    display: inline-block;
    background: var(--primary-color);
    color: var(--white);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    margin-bottom: 0.8rem;
}

.case-title {
    font-size: 1.2rem;
    margin-bottom: 0.8rem;
    color: var(--text-color);
}

.case-excerpt {
    color: var(--text-light);
    margin-bottom: 1rem;
    line-height: 1.8;
}

.case-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: bold;
    transition: color 0.3s;
}

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

.section-cta {
    text-align: center;
    margin-top: 3rem;
}

/* 特徴セクション */
.features {
    background: var(--bg-light);
}

.features-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature-item {
    background: var(--white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
}

.feature-number {
    font-size: 3rem;
    font-weight: bold;
    color: var(--primary-color);
    opacity: 0.3;
    margin-bottom: 1rem;
}

.feature-title {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.feature-desc {
    color: var(--text-light);
    line-height: 1.8;
}

/* CTAセクション */
.cta-section {
    background: linear-gradient(135deg, #0066cc 0%, #00a3cc 100%);
    color: var(--white);
    text-align: center;
}

.cta-title {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.cta-subtitle {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

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

.cta-section .btn-primary:hover {
    background: #f0f0f0;
}

/* フッター */
.footer {
    background: #1a1a1a;
    color: #ccc;
    padding: 3rem 0 1rem;
}

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

.footer-title {
    color: var(--white);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.footer-desc {
    line-height: 1.8;
}

.footer-links {
    list-style: none;
}

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

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

.footer-links a:hover {
    color: var(--white);
}

.footer-contact {
    line-height: 2;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.contact-icon {
    font-size: 1.2rem;
}

.footer-bottom {
    border-top: 1px solid #333;
    padding-top: 1rem;
    text-align: center;
    font-size: 0.9rem;
}

/* モバイル対応 */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

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

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

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

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

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

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

    .cta-title {
        font-size: 1.8rem;
    }
}

/* フォームスタイル */
.form-group {
    margin-bottom: 1.5rem;
}

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

.form-input,
.form-textarea {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
    font-family: inherit;
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.form-textarea {
    min-height: 150px;
    resize: vertical;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

/* アニメーション */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.5s ease-out;
}

/* 事例詳細ページ */
.case-detail-header {
    background: linear-gradient(135deg, #1e3a5f 0%, #0066cc 100%);
    color: var(--white);
    padding: 4rem 0 2rem;
}

.case-detail-content {
    max-width: 900px;
    margin: 0 auto;
    padding: 3rem 20px;
}

.case-detail-section {
    margin-bottom: 3rem;
}

.case-detail-section h3 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    color: var(--text-color);
    border-left: 4px solid var(--primary-color);
    padding-left: 1rem;
}

.case-detail-section p {
    line-height: 1.9;
    color: var(--text-light);
    margin-bottom: 1rem;
}

.case-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

.stat-card {
    background: var(--bg-light);
    padding: 2rem;
    text-align: center;
    border-radius: 10px;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--text-light);
}

/* 成功メッセージ */
.success-message {
    background: #d4edda;
    color: #155724;
    padding: 1rem;
    border-radius: 5px;
    margin-top: 1rem;
    display: none;
}

.success-message.show {
    display: block;
    animation: fadeIn 0.5s ease-out;
}