/* リセットと基本設定 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 夏っぽいグラデーションカラーパレット */
    --primary-gradient: linear-gradient(135deg, #FF6B6B 0%, #FF9A56 20%, #FFD93D 40%, #6BCF7F 60%, #4ECDC4 80%, #45B7D1 100%);
    --summer-red: #FF6B6B;
    --summer-orange: #FF9A56;
    --summer-yellow: #FFD93D;
    --summer-green: #6BCF7F;
    --summer-teal: #4ECDC4;
    --summer-blue: #45B7D1;
    --text-dark: #2D3748;
    --text-light: #718096;
    --white: #FFFFFF;
    --gray-50: #F7FAFC;
    --gray-100: #EDF2F7;
    --shadow: rgba(0, 0, 0, 0.1);
    
    /* 夏のセカンダリグラデーション */
    --secondary-gradient: linear-gradient(90deg, #FF6B6B 0%, #FFD93D 50%, #4ECDC4 100%);
    --accent-gradient: linear-gradient(45deg, #FF9A56 0%, #6BCF7F 100%);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--gray-50);
}

/* 汎用的な無効化ボタンスタイル */
button:disabled,
input[type="button"]:disabled,
input[type="submit"]:disabled,
input[type="reset"]:disabled {
    background-color: #e2e8f0;
    color: #a0aec0;
    cursor: not-allowed;
    opacity: 0.6;
    pointer-events: none;
    transform: none;
    box-shadow: none;
}

button:disabled:hover,
input[type="button"]:disabled:hover,
input[type="submit"]:disabled:hover,
input[type="reset"]:disabled:hover {
    background-color: #e2e8f0;
    transform: none;
    box-shadow: none;
}

/* 無効化されたリンクボタンスタイル */
a.disabled,
.disabled {
    background-color: #e2e8f0 !important;
    color: #a0aec0 !important;
    cursor: not-allowed !important;
    opacity: 0.6 !important;
    pointer-events: none !important;
    transform: none !important;
    box-shadow: none !important;
    text-shadow: none !important;
}

a.disabled:hover,
.disabled:hover {
    background-color: #e2e8f0 !important;
    transform: none !important;
    box-shadow: none !important;
}

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

/* ヘッダー */
.header {
    background: var(--white);
    box-shadow: 0 2px 20px var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

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

.logo h1 {
    font-size: 1.5rem;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: bold;
}

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

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

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

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

.nav-link:hover::after {
    width: 100%;
}

.cta-button {
    background: var(--primary-gradient);
    color: white !important;
    padding: 0.75rem 1.5rem;
    border-radius: 25px;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(255, 107, 157, 0.3);
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 107, 157, 0.4);
}

.cta-button:disabled {
    background: #e2e8f0;
    color: #a0aec0 !important;
    cursor: not-allowed;
    opacity: 0.6;
    transform: none;
    box-shadow: none;
    pointer-events: none;
}

.cta-button:disabled:hover {
    transform: none;
    box-shadow: none;
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    flex-direction: column;
    gap: 4px;
}

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

/* ヒーローセクション */
.hero {
    background: var(--primary-gradient);
    padding: 6rem 0;
    position: relative;
    overflow: hidden;
}

.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 20"><defs><linearGradient id="a" gradientUnits="userSpaceOnUse" x1="0" y1="0" x2="0" y2="20"><stop offset="0" stop-color="%23ffffff" stop-opacity="0.1"/><stop offset="1" stop-color="%23ffffff" stop-opacity="0"/></linearGradient></defs><rect width="100" height="20" fill="url(%23a)"/></svg>');
    opacity: 0.3;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.catchphrase {
    font-size: 1.4rem;
    font-weight: bold;
    color: white;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    margin-bottom: 1.5rem;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 1rem 1.5rem;
    border-radius: 15px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    display: inline-block;
}

.sale-badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    color: white;
    padding: 0.5rem 1.5rem;
    border-radius: 25px;
    font-size: 0.9rem;
    font-weight: bold;
    margin-bottom: 1rem;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.hero-title {
    font-size: 2.5rem;
    line-height: 1.2;
    margin-bottom: 1rem;
    color: white;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.highlight {
    color: white;
    text-shadow: 0 0 20px rgba(255, 255, 255, 0.5);
}

.hero-subtitle {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 2rem;
    text-shadow: 0 1px 5px rgba(0, 0, 0, 0.1);
}

.price-section {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(15px);
    padding: 2rem;
    border-radius: 20px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    margin-bottom: 2rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
    text-align: center;
}

.sale-announcement {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
}

.sale-text {
    font-size: 2rem;
    font-weight: bold;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    color: white;
}

.discount-text {
    background: linear-gradient(135deg, #FF6B6B, #4ECDC4);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-weight: bold;
    font-size: 1.2rem;
    box-shadow: 0 4px 15px rgba(255, 107, 107, 0.3);
}

.original-price {
    text-decoration: line-through;
    color: rgba(255, 255, 255, 0.7);
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.sale-price {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.price-label {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.8);
}

.price-amount {
    font-size: 2.5rem;
    font-weight: bold;
    color: white;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.discount-rate {
    background: rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 15px;
    font-size: 0.9rem;
    font-weight: bold;
    border: 1px solid rgba(255, 255, 255, 0.4);
}

.countdown-section {
    margin-bottom: 2rem;
}

.countdown-label {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 0.5rem;
}

.countdown {
    display: flex;
    gap: 1rem;
}

.countdown-item {
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    color: white;
    padding: 1rem;
    border-radius: 15px;
    text-align: center;
    min-width: 60px;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.countdown-value {
    display: block;
    font-size: 1.5rem;
    font-weight: bold;
}

.countdown-unit {
    font-size: 0.8rem;
}

.cta-button-large {
    display: inline-block;
    background: rgba(255, 255, 255, 0.25);
    backdrop-filter: blur(15px);
    color: white;
    padding: 1.2rem 2.5rem;
    border-radius: 30px;
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: bold;
    transition: all 0.3s;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.4);
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.cta-button-large:hover {
    background: rgba(255, 255, 255, 0.35);
    transform: translateY(-3px);
    box-shadow: 0 12px 35px rgba(0, 0, 0, 0.2);
}

.cta-button-large:disabled {
    background: rgba(160, 174, 192, 0.3);
    color: #a0aec0 !important;
    cursor: not-allowed;
    opacity: 0.5;
    transform: none;
    box-shadow: none;
    pointer-events: none;
    text-shadow: none;
}

.cta-button-large:disabled:hover {
    background: rgba(160, 174, 192, 0.3);
    transform: none;
    box-shadow: none;
}

.hero-image img {
    width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

/* コース紹介セクション */
.courses {
    padding: 4rem 0;
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 1rem;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: bold;
}

.section-subtitle {
    text-align: center;
    color: var(--text-light);
    margin-bottom: 3rem;
    font-size: 1.1rem;
}

/* クーポンコード表示 */
.coupon-container {
    max-width: 400px;
    margin: 0 auto 3rem;
    text-align: center;
}

/* ヒーローセクションのクーポン */
.hero-coupon {
    margin: 2rem auto;
    max-width: 350px;
    animation: pulse 2s ease-in-out infinite;
    padding: 0 1rem;
}

@keyframes pulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.02);
    }
    100% {
        transform: scale(1);
    }
}

.hero-coupon .coupon-code {
    background: linear-gradient(135deg, #fff 0%, #f7f7ff 100%);
    box-shadow: 0 8px 25px rgba(255, 107, 157, 0.3);
    max-width: 100%;
    margin: 0 auto;
}

.coupon-label {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: 0.5rem;
}

.hero-coupon .coupon-label {
    font-size: 1.2rem;
    font-weight: bold;
    color: white;
    margin-bottom: 0.8rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.coupon-code {
    display: flex;
    align-items: center;
    background: white;
    border: 2px dashed var(--summer-orange);
    border-radius: 8px;
    padding: 1rem;
    position: relative;
    cursor: pointer;
    transition: all 0.3s ease;
}

.coupon-code:hover {
    border-color: var(--summer-red);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(255, 107, 157, 0.2);
}

.code-text {
    flex: 1;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--text-dark);
    letter-spacing: 0.1em;
    font-family: 'Courier New', monospace;
}

.hero-coupon .code-text {
    font-size: 2rem;
    color: var(--summer-orange);
}

/* モバイル対応 */
@media (max-width: 768px) {
    .hero-coupon {
        max-width: 320px;
        margin: 1.5rem auto;
    }
    
    .hero-coupon .code-text {
        font-size: 1.6rem;
    }
    
    .hero-coupon .coupon-label {
        font-size: 1rem;
    }
}

.copy-button {
    background: var(--primary-gradient);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    transition: transform 0.2s;
    font-weight: 500;
}

.copy-button:hover {
    transform: scale(1.05);
}

.copy-button:active {
    transform: scale(0.95);
}

.copy-button:disabled {
    background: #e2e8f0;
    color: #a0aec0;
    cursor: not-allowed;
    opacity: 0.6;
    transform: none;
    pointer-events: none;
}

.copy-button:disabled:hover,
.copy-button:disabled:active {
    transform: none;
}

.button-text {
    font-size: 0.9rem;
}

.copy-feedback {
    margin-top: 0.5rem;
    font-size: 0.9rem;
    color: var(--summer-teal);
    opacity: 0;
    transform: translateY(-10px);
    transition: all 0.3s ease;
}

.copy-feedback.show {
    opacity: 1;
    transform: translateY(0);
}

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

.course-card {
    background-color: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s;
}

.course-card:hover {
    transform: translateY(-5px);
}

.course-image {
    position: relative;
    height: 200px;
    overflow: hidden;
}

.course-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    aspect-ratio: 16/9;
}

.course-badge {
    position: absolute;
    top: 10px;
    right: 10px;
    background-color: #ff6b6b;
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: bold;
}

.course-content {
    padding: 1.5rem;
}

.course-title {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    line-height: 1.4;
}

.course-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.course-instructor {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.instructor-avatar {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    object-fit: cover;
}

.course-rating {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.stars {
    color: var(--summer-orange);
}

.rating-value {
    font-weight: bold;
}

.rating-count {
    color: var(--text-light);
    font-size: 0.9rem;
}

.course-details {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    padding: 1rem 0;
    border-top: 1px solid #eee;
    border-bottom: 1px solid #eee;
}

.detail-item {
    flex: 1;
    text-align: center;
}

.detail-label {
    display: block;
    font-size: 0.8rem;
    color: #666;
}

.detail-value {
    display: block;
    font-weight: bold;
    margin-top: 0.25rem;
}

.course-features {
    list-style: none;
    margin-bottom: 1.5rem;
}

.course-features li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.course-features li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--summer-teal);
    font-weight: bold;
}

.course-price {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.course-price .original {
    text-decoration: line-through;
    color: #999;
    font-size: 0.9rem;
}

.course-price .sale {
    font-size: 1.8rem;
    font-weight: bold;
    color: #e53935;
    text-shadow: 0 1px 2px rgba(229, 57, 53, 0.2);
}

.course-cta {
    display: block;
    text-align: center;
    background: linear-gradient(135deg, #f57c00 0%, #ff9800 100%);
    color: white;
    padding: 1rem 2rem;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-size: 0.9rem;
    box-shadow: 0 4px 15px rgba(245, 124, 0, 0.3);
}

.course-cta:hover {
    background: linear-gradient(135deg, #e65100 0%, #f57c00 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(245, 124, 0, 0.4);
}

.course-cta:disabled {
    background-color: #e2e8f0;
    color: #a0aec0;
    cursor: not-allowed;
    opacity: 0.6;
    pointer-events: none;
}

.course-cta:disabled:hover {
    background-color: #e2e8f0;
}

/* 講師紹介セクション */
.instructor {
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--white) 100%);
    padding: 4rem 0;
}

.instructor-profile {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 3rem;
    align-items: start;
    max-width: 900px;
    margin: 0 auto;
}

.instructor-image img {
    width: 100%;
    border-radius: 10px;
}

.instructor-name {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.instructor-title {
    color: #666;
    margin-bottom: 1.5rem;
}

.instructor-bio p {
    margin-bottom: 1rem;
}

.instructor-achievements {
    display: flex;
    gap: 2rem;
    margin-top: 2rem;
}

.achievement {
    text-align: center;
}

.achievement-number {
    display: block;
    font-size: 2rem;
    font-weight: bold;
    color: #ec5252;
}

.achievement-label {
    font-size: 0.9rem;
    color: #666;
}

/* 受講生の声セクション */
.reviews {
    padding: 4rem 0;
    background: var(--gray-50);
}

.reviews-slider {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.review-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 20px;
    box-shadow: 0 8px 30px var(--shadow);
    border: 1px solid var(--gray-100);
    transition: all 0.3s;
    position: relative;
}

.review-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(255, 107, 157, 0.1);
}

.review-header {
    margin-bottom: 1rem;
}

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

.reviewer-avatar {
    width: 50px;
    height: 50px;
    background: var(--primary-gradient);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-weight: bold;
    box-shadow: 0 4px 15px rgba(255, 107, 157, 0.3);
}

.reviewer-name {
    font-size: 1.1rem;
    margin-bottom: 0.25rem;
}

.review-date {
    font-size: 0.8rem;
    color: var(--text-light);
    margin-left: 0.5rem;
}

.review-rating {
    color: var(--summer-orange);
}

.review-text {
    margin-bottom: 1rem;
    line-height: 1.8;
    position: relative;
    padding-left: 1rem;
}

.review-text::before {
    content: '"';
    position: absolute;
    left: 0;
    top: -0.5rem;
    font-size: 3rem;
    color: var(--summer-teal);
    opacity: 0.3;
    font-family: Georgia, serif;
}

.review-course {
    font-size: 0.9rem;
    color: #666;
}

/* FAQセクション */
.faq {
    background: linear-gradient(135deg, var(--white) 0%, var(--gray-50) 100%);
    padding: 4rem 0;
}

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

.faq-item {
    background: var(--white);
    margin-bottom: 1rem;
    border-radius: 15px;
    overflow: hidden;
    border: 1px solid var(--gray-100);
    box-shadow: 0 4px 15px var(--shadow);
}

.faq-question {
    width: 100%;
    padding: 1.5rem;
    text-align: left;
    background: none;
    border: none;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1.1rem;
    font-weight: 500;
}

.faq-question:hover {
    background: linear-gradient(135deg, rgba(255, 154, 86, 0.1) 0%, rgba(255, 107, 157, 0.1) 100%);
}

.faq-icon {
    font-size: 1.5rem;
    transition: transform 0.3s;
}

.faq-question[aria-expanded="true"] .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    display: none;
    padding: 0 1.5rem 1.5rem;
}

.faq-question[aria-expanded="true"] + .faq-answer {
    display: block;
}

/* CTAセクション */
.apply {
    padding: 4rem 0;
}

.apply-content {
    max-width: 900px;
    margin: 0 auto;
    background-color: white;
    padding: 3rem;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.apply-subtitle {
    text-align: center;
    color: #666;
    margin-bottom: 2rem;
}

.cta-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.cta-link {
    display: block;
    background: var(--white);
    padding: 2rem;
    border-radius: 20px;
    text-decoration: none;
    color: var(--text-dark);
    text-align: center;
    transition: all 0.3s;
    border: 2px solid var(--gray-100);
    box-shadow: 0 4px 15px var(--shadow);
}

.cta-link:hover {
    border: 2px solid transparent;
    border-image: var(--primary-gradient) 1;
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(255, 107, 157, 0.2);
}

.cta-link h3 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: bold;
}

.cta-link p {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: 1rem;
}

.price-highlight {
    font-size: 1.5rem;
    font-weight: bold;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.cta-button-text {
    display: inline-block;
    background: linear-gradient(135deg, #f57c00 0%, #ff9800 100%);
    color: white;
    padding: 1rem 2rem;
    border-radius: 25px;
    font-weight: 600;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(245, 124, 0, 0.3);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-size: 0.9rem;
}

.cta-link:hover .cta-button-text {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(245, 124, 0, 0.4);
    background: linear-gradient(135deg, #e65100 0%, #f57c00 100%);
}

.cta-button-text:disabled {
    background: #e2e8f0;
    color: #a0aec0;
    cursor: not-allowed;
    opacity: 0.6;
    transform: none;
    box-shadow: none;
    pointer-events: none;
}

.cta-link:hover .cta-button-text:disabled {
    transform: none;
    box-shadow: none;
}

.form-note {
    text-align: center;
    color: #666;
    font-size: 0.9rem;
    margin-top: 1rem;
}

/* フッター */
.footer {
    background: var(--primary-gradient);
    color: white;
    padding: 3rem 0 1rem;
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.1);
}

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

.footer-info h3 {
    margin-bottom: 1rem;
}

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

.footer-links a {
    color: white;
    text-decoration: none;
    line-height: 2;
}

.footer-links a:hover {
    text-decoration: underline;
}

.footer-social {
    display: flex;
    gap: 1.5rem;
}

.social-icon {
    color: white;
    text-decoration: none;
    font-size: 1.5rem;
    transition: all 0.3s;
    display: inline-block;
}

.social-icon:hover {
    transform: translateY(-3px);
    opacity: 0.8;
}

.social-icon i {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.social-icon:hover i {
    background: rgba(255, 255, 255, 0.2);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    position: relative;
    z-index: 1;
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
    .nav-list {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .course-grid {
        grid-template-columns: 1fr;
    }
    
    .instructor-profile {
        grid-template-columns: 1fr;
    }
    
    .instructor-achievements {
        justify-content: space-around;
    }
    
    .reviews-slider {
        grid-template-columns: 1fr;
    }
    
    .apply-content {
        padding: 2rem;
    }
}