/* ===================================
   生成AI基礎講座 - メインスタイルシート
   信頼性と先進性を両立したミニマルデザイン
   =================================== */

/* ===================================
   変数定義
   =================================== */
:root {
    /* カラースキーム */
    --color-primary: #2962FF;
    --color-primary-dark: #0039CB;
    --color-primary-light: #768FFF;
    --color-secondary: #FF6D00;
    --color-accent: #FFAB00;
    --color-dark: #1A237E;
    --color-dark-alt: #263238;
    --color-gray-dark: #37474F;
    --color-gray: #607D8B;
    --color-gray-light: #B0BEC5;
    --color-gray-lighter: #ECEFF1;
    --color-white: #FFFFFF;
    --color-success: #00C853;
    
    /* タイポグラフィ */
    --font-primary: 'Noto Sans JP', sans-serif;
    --font-secondary: 'Inter', sans-serif;
    
    /* サイジング */
    --container-width: 1200px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* トランジション */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* シャドウ */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);
    
    /* ボーダー */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 16px;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    font-weight: 400;
    line-height: 1.7;
    color: var(--color-dark-alt);
    background-color: var(--color-white);
    overflow-x: hidden;
}

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

a {
    text-decoration: none;
    color: inherit;
    transition: all var(--transition-normal);
}

ul, ol {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* ===================================
   ユーティリティクラス
   =================================== */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    color: var(--color-dark);
    text-align: center;
    margin-bottom: var(--spacing-md);
    line-height: 1.3;
}

.section-description {
    font-size: 1.125rem;
    color: var(--color-gray);
    text-align: center;
    margin-bottom: var(--spacing-lg);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* ===================================
   ボタンスタイル
   =================================== */
.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    border-radius: var(--border-radius-md);
    transition: all var(--transition-normal);
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-white);
    box-shadow: var(--shadow-md);
}

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

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

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

.btn-large {
    padding: 1.25rem 3rem;
    font-size: 1.125rem;
}

.btn-header {
    padding: 0.75rem 1.5rem;
    font-size: 0.9rem;
}

/* ===================================
   ヘッダー
   =================================== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.site-header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-md);
}

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

.logo a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-dark);
}

.logo i {
    font-size: 1.75rem;
    color: var(--color-primary);
}

.main-nav ul {
    display: flex;
    gap: 2rem;
}

.main-nav a {
    font-weight: 500;
    color: var(--color-gray-dark);
    position: relative;
}

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

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

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

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 0.5rem;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--color-dark);
    transition: all var(--transition-normal);
}

/* ===================================
   ヒーローセクション
   =================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8rem 0 4rem;
    background: linear-gradient(135deg, #1A237E 0%, #0D47A1 100%);
    color: var(--color-white);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.1;
}

#hero-canvas {
    width: 100%;
    height: 100%;
}

.hero-content {
    position: relative;
    z-index: 10;
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.hero-title {
    font-size: clamp(2rem, 6vw, 3.5rem);
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    animation: fadeInUp 0.8s ease;
}

.hero-subtitle {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
    opacity: 0.95;
    animation: fadeInUp 1s ease 0.2s backwards;
}

.hero-cta {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-md);
    animation: fadeInUp 1.2s ease 0.4s backwards;
}

.hero-trust {
    font-size: 0.9rem;
    opacity: 0.8;
    animation: fadeInUp 1.4s ease 0.6s backwards;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===================================
   課題提起セクション
   =================================== */
.challenge-section {
    padding: var(--spacing-xl) 0;
    background: var(--color-gray-lighter);
}

.challenge-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    max-width: 1000px;
    margin: 0 auto;
}

.challenge-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.5rem;
    background: var(--color-white);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.challenge-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.challenge-item i {
    font-size: 1.5rem;
    color: var(--color-success);
    flex-shrink: 0;
}

.challenge-item p {
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-gray-dark);
}

/* ===================================
   統計セクション
   =================================== */
.stats-section {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, var(--color-dark) 0%, var(--color-dark-alt) 100%);
    color: var(--color-white);
}

.stats-section .section-title {
    color: var(--color-white);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    max-width: 1100px;
    margin: 0 auto;
}

.stat-card {
    text-align: center;
    padding: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--border-radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all var(--transition-normal);
}

.stat-card:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-5px);
}

.stat-icon {
    font-size: 3rem;
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
}

.stat-number {
    font-size: 4rem;
    font-weight: 900;
    line-height: 1;
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
}

.stat-unit {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-accent);
    margin-left: 0.25rem;
}

.stat-label {
    margin-top: var(--spacing-sm);
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.9);
}

/* ===================================
   特徴セクション
   =================================== */
.features-section {
    padding: var(--spacing-xl) 0;
    background: var(--color-white);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-md);
}

.feature-card {
    padding: var(--spacing-lg);
    background: var(--color-white);
    border: 1px solid var(--color-gray-lighter);
    border-radius: var(--border-radius-lg);
    transition: all var(--transition-normal);
}

.feature-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-8px);
    border-color: var(--color-primary-light);
}

.feature-icon {
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--color-primary);
    background: linear-gradient(135deg, rgba(41, 98, 255, 0.1) 0%, rgba(118, 143, 255, 0.1) 100%);
    border-radius: var(--border-radius-md);
    margin-bottom: var(--spacing-md);
}

.feature-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: var(--spacing-sm);
}

.feature-description {
    font-size: 1rem;
    color: var(--color-gray);
    line-height: 1.7;
}

/* ===================================
   お客様の声セクション
   =================================== */
.testimonials-section {
    padding: var(--spacing-xl) 0;
    background: var(--color-gray-lighter);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-md);
}

.testimonial-card {
    background: var(--color-white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

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

.testimonial-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: var(--spacing-md);
}

.testimonial-avatar {
    font-size: 3.5rem;
    color: var(--color-primary);
}

.testimonial-name {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: 0.25rem;
}

.testimonial-company {
    font-size: 0.9rem;
    color: var(--color-gray);
}

.testimonial-content {
    position: relative;
}

.testimonial-quote {
    font-size: 2rem;
    color: var(--color-primary-light);
    opacity: 0.3;
    margin-bottom: var(--spacing-sm);
}

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

/* ===================================
   カリキュラムセクション
   =================================== */
.curriculum-section {
    padding: var(--spacing-xl) 0;
    background: var(--color-white);
}

.curriculum-container {
    max-width: 1000px;
    margin: 0 auto;
}

.curriculum-category {
    background: var(--color-white);
    border: 1px solid var(--color-gray-lighter);
    border-radius: var(--border-radius-lg);
    margin-bottom: var(--spacing-md);
    overflow: hidden;
    transition: all var(--transition-normal);
}

.curriculum-category:hover {
    box-shadow: var(--shadow-md);
}

.category-header {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: var(--spacing-md);
    background: linear-gradient(135deg, rgba(41, 98, 255, 0.05) 0%, rgba(118, 143, 255, 0.05) 100%);
    border-bottom: 1px solid var(--color-gray-lighter);
}

.category-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    color: var(--color-primary);
    background: var(--color-white);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
}

.category-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-dark);
}

.curriculum-list {
    padding: var(--spacing-md);
}

.curriculum-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--color-gray-lighter);
    transition: all var(--transition-fast);
}

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

.curriculum-item:hover {
    padding-left: 0.5rem;
    background: rgba(41, 98, 255, 0.02);
}

.curriculum-item i {
    font-size: 0.75rem;
    color: var(--color-primary);
    flex-shrink: 0;
    margin-top: 0.35rem;
}

.curriculum-item span {
    font-size: 1rem;
    color: var(--color-gray-dark);
    line-height: 1.6;
}

/* ===================================
   講師セクション
   =================================== */
.instructor-section {
    padding: var(--spacing-xl) 0;
    background: var(--color-gray-lighter);
}

.instructor-card {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    gap: var(--spacing-lg);
    align-items: center;
    background: var(--color-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
}

.instructor-image {
    font-size: 8rem;
    color: var(--color-primary);
    flex-shrink: 0;
}

.instructor-name {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: 0.5rem;
}

.instructor-title {
    font-size: 1.125rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

.instructor-bio {
    list-style: disc;
    padding-left: 1.5rem;
}

.instructor-bio li {
    font-size: 1rem;
    color: var(--color-gray-dark);
    line-height: 1.8;
    margin-bottom: 0.75rem;
}

/* ===================================
   プロセスセクション
   =================================== */
.process-section {
    padding: var(--spacing-xl) 0;
    background: var(--color-white);
}

.process-timeline {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    max-width: 1100px;
    margin: 0 auto;
}

.process-step {
    position: relative;
    text-align: center;
    padding: var(--spacing-md);
    background: var(--color-white);
    border: 2px solid var(--color-gray-lighter);
    border-radius: var(--border-radius-lg);
    transition: all var(--transition-normal);
}

.process-step:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-5px);
}

.step-number {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-white);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    border-radius: 50%;
    box-shadow: var(--shadow-sm);
}

.step-icon {
    font-size: 3rem;
    color: var(--color-primary);
    margin: var(--spacing-md) 0;
}

.step-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: var(--spacing-sm);
}

.step-description {
    font-size: 0.9rem;
    color: var(--color-gray);
    line-height: 1.6;
}

/* ===================================
   LMSセクション
   =================================== */
.lms-section {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-white);
}

.lms-section .section-title {
    color: var(--color-white);
}

.lms-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    max-width: 1000px;
    margin: 0 auto;
}

.lms-feature {
    text-align: center;
    padding: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--border-radius-lg);
    transition: all var(--transition-normal);
}

.lms-feature:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-5px);
}

.lms-feature i {
    font-size: 3rem;
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
}

.lms-feature h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.lms-feature p {
    font-size: 0.95rem;
    opacity: 0.9;
}

/* ===================================
   料金セクション
   =================================== */
.pricing-section {
    padding: var(--spacing-xl) 0;
    background: var(--color-gray-lighter);
}

.pricing-card {
    max-width: 600px;
    margin: 0 auto;
    background: var(--color-white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.pricing-header {
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-white);
    text-align: center;
}

.pricing-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.pricing-subtitle {
    font-size: 1rem;
    opacity: 0.9;
}

.pricing-price {
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--color-white);
}

.price-amount {
    font-size: 4rem;
    font-weight: 900;
    color: var(--color-dark);
    line-height: 1;
}

.price-currency {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-gray-dark);
    margin-left: 0.5rem;
}

.price-tax {
    display: block;
    font-size: 1rem;
    color: var(--color-gray);
    margin-top: 0.5rem;
}

.pricing-features {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--color-gray-lighter);
}

.pricing-features h4 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: var(--spacing-md);
}

.pricing-features ul {
    list-style: none;
}

.pricing-features li {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem 0;
    font-size: 1rem;
    color: var(--color-gray-dark);
}

.pricing-features li i {
    color: var(--color-success);
    font-size: 1.25rem;
}

.pricing-cta {
    padding: var(--spacing-lg);
    text-align: center;
}

/* ===================================
   FAQセクション
   =================================== */
.faq-section {
    padding: var(--spacing-xl) 0;
    background: var(--color-white);
}

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

.faq-item {
    background: var(--color-white);
    border: 1px solid var(--color-gray-lighter);
    border-radius: var(--border-radius-md);
    margin-bottom: var(--spacing-sm);
    overflow: hidden;
}

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-dark);
    text-align: left;
    transition: all var(--transition-normal);
}

.faq-question:hover {
    background: var(--color-gray-lighter);
}

.faq-question i {
    color: var(--color-primary);
    transition: transform var(--transition-normal);
    flex-shrink: 0;
    margin-left: 1rem;
}

.faq-item.active .faq-question i {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow);
}

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer p {
    padding: 0 var(--spacing-md) var(--spacing-md);
    font-size: 1rem;
    line-height: 1.8;
    color: var(--color-gray-dark);
}

/* ===================================
   コンタクトセクション
   =================================== */
.contact-section {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-accent) 100%);
    color: var(--color-white);
}

.contact-section .section-title {
    color: var(--color-white);
}

.contact-section .section-description {
    color: rgba(255, 255, 255, 0.95);
}

.contact-methods {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    max-width: 800px;
    margin: 0 auto var(--spacing-lg);
}

.contact-method {
    text-align: center;
    padding: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--border-radius-lg);
    transition: all var(--transition-normal);
}

.contact-method:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-5px);
}

.contact-method i {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.contact-method h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.contact-info {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.contact-note {
    font-size: 0.9rem;
    opacity: 0.9;
}

.contact-form-container {
    max-width: 700px;
    margin: 0 auto;
    background: var(--color-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: 0.5rem;
}

.required {
    color: var(--color-secondary);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 0.875rem;
    font-size: 1rem;
    font-family: inherit;
    color: var(--color-dark);
    background: var(--color-white);
    border: 2px solid var(--color-gray-lighter);
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-normal);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(41, 98, 255, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.form-submit {
    text-align: center;
    margin-top: var(--spacing-md);
}

/* ===================================
   フッター
   =================================== */
.site-footer {
    background: var(--color-dark);
    color: var(--color-white);
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

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

.footer-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--color-white);
}

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

.footer-links li {
    margin-bottom: 0.75rem;
    font-size: 0.95rem;
    line-height: 1.6;
    opacity: 0.9;
}

.footer-links a {
    transition: all var(--transition-fast);
}

.footer-links a:hover {
    color: var(--color-primary-light);
    padding-left: 5px;
}

.footer-social {
    display: flex;
    gap: 1rem;
    margin-top: var(--spacing-sm);
}

.footer-social a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    transition: all var(--transition-normal);
}

.footer-social a:hover {
    background: var(--color-primary);
    transform: translateY(-3px);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    font-size: 0.9rem;
    opacity: 0.8;
}

/* ===================================
   スクロールトップボタン
   =================================== */
.scroll-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary);
    color: var(--color-white);
    border-radius: 50%;
    box-shadow: var(--shadow-md);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: 999;
}

.scroll-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.scroll-to-top:hover {
    background: var(--color-primary-dark);
    transform: translateY(-5px);
}

/* ===================================
   レスポンシブデザイン
   =================================== */

/* タブレット */
@media (max-width: 1024px) {
    :root {
        --spacing-xl: 4rem;
        --spacing-lg: 3rem;
    }
    
    .instructor-card {
        flex-direction: column;
        text-align: center;
    }
}

/* モバイル */
@media (max-width: 768px) {
    :root {
        --spacing-xl: 3rem;
        --spacing-lg: 2rem;
        --spacing-md: 1.5rem;
    }
    
    .main-nav {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .btn-header {
        display: none;
    }
    
    .hero {
        min-height: auto;
        padding: 6rem 0 3rem;
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: stretch;
    }
    
    .hero-cta .btn {
        width: 100%;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .features-grid,
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .process-timeline {
        grid-template-columns: 1fr;
    }
    
    .contact-methods {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-social {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .stat-number {
        font-size: 3rem;
    }
    
    .stat-unit {
        font-size: 1.25rem;
    }
    
    .price-amount {
        font-size: 3rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
}

/* ===================================
   アクセシビリティ
   =================================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* フォーカス表示 */
*:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 2px;
}