/* リセット */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", "Yu Gothic", "Hiragino Sans", sans-serif;
    line-height: 1.6;
    color: #333;
    background: #fff;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

button {
    font-family: inherit;
}

/* ヘッダー */
.header {
    background: #fff;
    border-bottom: 1px solid #e0e0e0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

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

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    font-size: 20px;
    font-weight: 700;
    color: #0066ff;
}

.desktop-nav {
    display: none;
    align-items: center;
    gap: 30px;
}

.nav-link {
    color: #333;
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s;
}

.nav-link:hover {
    color: #0066ff;
}

.btn-register {
    background: #ff6600;
    color: #fff;
    border: none;
    padding: 10px 24px;
    border-radius: 25px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s, transform 0.2s;
}

.btn-register:hover {
    background: #ff5500;
    transform: translateY(-1px);
}

/* ハンバーガーメニュー */
.hamburger {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    width: 28px;
    height: 22px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
}

.hamburger span {
    display: block;
    width: 100%;
    height: 3px;
    background: #333;
    border-radius: 2px;
    transition: all 0.3s;
}

.hamburger.active span:nth-child(1) {
    transform: translateY(9.5px) rotate(45deg);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: translateY(-9.5px) rotate(-45deg);
}

/* モバイルメニュー */
.mobile-menu {
    position: fixed;
    top: 0;
    right: 0;
    width: 280px;
    height: 100vh;
    background: #fff;
    box-shadow: -4px 0 12px rgba(0,0,0,0.1);
    transform: translateX(100%);
    transition: transform 0.3s ease-in-out;
    z-index: 1001;
    padding: 80px 30px 30px;
}

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

.close-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    background: transparent;
    border: none;
    font-size: 36px;
    color: #333;
    cursor: pointer;
    line-height: 1;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.mobile-nav {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.mobile-nav-link {
    color: #333;
    text-decoration: none;
    font-size: 16px;
    padding: 12px 0;
    border-bottom: 1px solid #f0f0f0;
    transition: color 0.3s;
}

.mobile-nav-link:hover {
    color: #0066ff;
}

.btn-register-mobile {
    margin-top: 20px;
    width: 100%;
}

.overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: rgba(0,0,0,0.5);
    z-index: 999;
    opacity: 0;
    transition: opacity 0.3s;
}

.overlay.active {
    display: block;
    opacity: 1;
}

/* コンテナ */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ヒーローセクション */
.hero-section {
    background: linear-gradient(135deg, #0066ff 0%, #00ccff 100%);
    color: #fff;
    padding: 60px 20px;
    text-align: center;
}

.hero-container {
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: 28px;
    font-weight: 700;
    line-height: 1.4;
    margin-bottom: 20px;
}

.hero-subtitle {
    font-size: 16px;
    line-height: 1.6;
    margin-bottom: 30px;
    opacity: 0.95;
}

.btn-cta {
    background: #fff;
    color: #0066ff;
    border: none;
    padding: 16px 40px;
    border-radius: 30px;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.3s, box-shadow 0.3s;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.btn-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0,0,0,0.2);
}

.btn-cta-large {
    padding: 18px 50px;
    font-size: 18px;
}

/* 特徴セクション */
.features-section {
    padding: 80px 20px;
    background: #fff;
}

.section-title {
    text-align: center;
    /* font-size: 28px; */
    font-weight: 700;
    margin-bottom: 50px;
    color: #333;
}

.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
    max-width: 1000px;
    margin: 0 auto;
}

.feature-card {
    background: #fff;
    border: 1px solid #e0e0e0;
    border-radius: 12px;
    padding: 30px;
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.1);
}

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    border-radius: 50%;
    overflow: hidden;
}

.feature-icon img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.feature-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
    color: #333;
}

.feature-text {
    font-size: 14px;
    line-height: 1.7;
    color: #666;
}

/* ステップセクション */
.steps-section {
    padding: 80px 20px;
    background: #f8f9fa;
}

.steps-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
    max-width: 1000px;
    margin: 0 auto;
}

.step-card {
    background: #fff;
    border-radius: 12px;
    padding: 30px;
    text-align: center;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.step-number {
    display: inline-block;
    background: #0066ff;
    color: #fff;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 700;
    margin-bottom: 20px;
}

.step-icon-wrapper {
    width: 100%;
    max-width: 200px;
    height: 140px;
    margin: 0 auto 20px;
    border-radius: 8px;
    overflow: hidden;
    background: #f0f0f0;
}

.step-icon-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.step-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    color: #333;
}

.step-text {
    font-size: 14px;
    line-height: 1.7;
    color: #666;
}

/* メリットセクション */
.benefits-section {
    padding: 80px 20px;
    background: #fff;
}

.benefits-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 25px;
    max-width: 900px;
    margin: 0 auto;
}

.benefit-item {
    display: flex;
    gap: 20px;
    align-items: flex-start;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 8px;
    transition: background 0.3s;
}

.benefit-item:hover {
    background: #f0f4f8;
}

.benefit-icon {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    background: #0066ff;
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: 700;
}

.benefit-content {
    flex: 1;
}

.benefit-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 6px;
    color: #333;
}

.benefit-text {
    font-size: 14px;
    line-height: 1.6;
    color: #666;
}

/* CTAセクション */
.cta-section {
    padding: 80px 20px;
    background: linear-gradient(135deg, #ff6600 0%, #ff9933 100%);
    color: #fff;
    text-align: center;
}

.cta-container {
    max-width: 700px;
    margin: 0 auto;
}

.cta-title {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 16px;
}

.cta-text {
    font-size: 16px;
    margin-bottom: 30px;
    opacity: 0.95;
}

.cta-note {
    margin-top: 20px;
    font-size: 13px;
    opacity: 0.9;
}

/* よくある質問 */
.faq-section {
    padding: 80px 20px;
    background: #f8f9fa;
}

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

.faq-item {
    background: #fff;
    border-radius: 8px;
    margin-bottom: 12px;
    overflow: hidden;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.faq-question {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    background: #fff;
    border: none;
    text-align: left;
    font-size: 15px;
    font-weight: 600;
    color: #333;
    cursor: pointer;
    transition: background 0.3s;
}

.faq-question:hover {
    background: #f8f9fa;
}

.faq-toggle {
    font-size: 24px;
    font-weight: 300;
    color: #0066ff;
    transition: transform 0.3s;
}

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

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

.faq-item.active .faq-answer {
    max-height: 300px;
    padding: 0 24px 20px;
}

.faq-answer p {
    font-size: 14px;
    line-height: 1.7;
    color: #666;
}

/* フッター */
.footer {
    background: #1a1a1a;
    color: #fff;
    padding: 60px 20px 30px;
}

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

.footer-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 16px;
    color: #fff;
}

.footer-description {
    font-size: 14px;
    line-height: 1.6;
    color: #aaa;
}

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

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    color: #aaa;
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: #fff;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid #333;
}

.footer-bottom p {
    font-size: 13px;
    color: #888;
}

/* レスポンシブ - タブレット以上 */
@media (min-width: 768px) {
    .hamburger {
        display: none;
    }

    .desktop-nav {
        display: flex;
    }

    .hero-title {
        font-size: 40px;
    }

    .hero-subtitle {
        font-size: 18px;
    }

    .section-title {
        font-size: 32px;
    }

    .features-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 40px;
    }

    .steps-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 30px;
    }

    .benefits-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px;
    }

    .footer-content {
        grid-template-columns: repeat(4, 1fr);
        gap: 40px;
    }
}

/* レスポンシブ - PC */
@media (min-width: 1024px) {
    .hero-section {
        padding: 100px 20px;
    }

    .hero-title {
        font-size: 48px;
    }

    .hero-subtitle {
        font-size: 20px;
    }

    .features-section,
    .steps-section,
    .benefits-section,
    .cta-section,
    .faq-section {
        padding: 100px 20px;
    }

    .section-title {
        /* font-size: 36px; */
        margin-bottom: 60px;
    }

    .cta-title {
        font-size: 32px;
    }
}