/* ===================================
   真城由理のボイトレ教室 Webテキスト
   スタイルシート
   =================================== */

/* CSS変数 */
:root {
    /* カラーパレット */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --accent-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --success-color: #4ecdc4;
    --warning-color: #ffd93d;
    --danger-color: #ff6b6b;
    
    /* グレースケール */
    --text-primary: #2d3436;
    --text-secondary: #636e72;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --border-color: #e1e8ed;
    
    /* 解剖図の色 */
    --anatomy-nasal: #FFE0F0;
    --anatomy-oral: #FFF0F5;
    --anatomy-larynx: #E6F3FF;
    --anatomy-trachea: #E0FFFF;
    --anatomy-lung: #FFB6C1;
    --anatomy-diaphragm: #CD5C5C;
    
    /* タイポグラフィ */
    --font-ja: 'Noto Sans JP', sans-serif;
    --font-en: 'Inter', sans-serif;
    
    /* スペーシング */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* シャドウ */
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 20px rgba(0,0,0,0.15);
    --shadow-xl: 0 20px 40px rgba(0,0,0,0.2);
    
    /* トランジション */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-ja);
    color: var(--text-primary);
    line-height: 1.7;
    background-color: var(--bg-light);
}

/* ヘッダー */
.header {
    background: var(--bg-white);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav {
    padding: 1rem 0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo i {
    font-size: 2rem;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    transition: var(--transition-fast);
    position: relative;
}

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

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

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    transition: var(--transition-fast);
}

/* ヒーローセクション */
.hero {
    background: var(--primary-gradient);
    color: white;
    padding: var(--spacing-xl) 0;
    text-align: center;
    position: relative;
    overflow: hidden;
    min-height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    padding: 0 var(--spacing-md);
}

.hero-title {
    font-size: 3rem;
    font-weight: 900;
    margin-bottom: var(--spacing-md);
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

.hero-subtitle {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.95;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: 1rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition-normal);
    display: inline-block;
}

.btn-primary {
    background: white;
    color: #667eea;
}

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

.btn-secondary {
    background: rgba(255,255,255,0.2);
    color: white;
    border: 2px solid white;
}

.btn-secondary:hover {
    background: white;
    color: #667eea;
}

.hero-decoration {
    position: absolute;
    font-size: 20rem;
    opacity: 0.1;
    z-index: 1;
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

/* アニメーション */
.animate-fade-in {
    animation: fadeIn 1s ease-out;
}

.animate-fade-in-delay {
    animation: fadeIn 1s ease-out 0.3s backwards;
}

.animate-fade-in-delay-2 {
    animation: fadeIn 1s ease-out 0.6s backwards;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* セクション共通 */
.section {
    padding: var(--spacing-xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-title i {
    margin-right: var(--spacing-sm);
}

.section-description {
    font-size: 1.2rem;
    color: var(--text-secondary);
}

/* 解剖学セクション */
.anatomy-section {
    background: var(--bg-white);
}

/* 解剖図画像グリッド */
.anatomy-images-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.anatomy-image-card {
    background: white;
    border-radius: 20px;
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
    transition: var(--transition-normal);
}

.anatomy-image-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.anatomy-image-card h3 {
    color: #667eea;
    font-size: 1.3rem;
    margin-bottom: var(--spacing-md);
}

.image-wrapper {
    background: var(--bg-light);
    border-radius: 15px;
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.anatomy-img {
    width: 100%;
    height: auto;
    border-radius: 10px;
    display: block;
}

.image-caption {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* 解剖部位の解説 */
.anatomy-explanations {
    background: var(--bg-light);
    border-radius: 20px;
    padding: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.explanation-title {
    color: #667eea;
    font-size: 2rem;
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.explanation-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-lg);
}

.explanation-card {
    background: white;
    border-radius: 15px;
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
    border-left: 4px solid #667eea;
}

.explanation-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.explanation-card h4 {
    color: #764ba2;
    font-size: 1.3rem;
    margin-bottom: var(--spacing-md);
}

.explanation-content p {
    margin-bottom: var(--spacing-sm);
    line-height: 1.7;
}

.explanation-content strong {
    color: #667eea;
}

.tips {
    background: #f0f7ff;
    border-left: 4px solid #4ecdc4;
    padding: var(--spacing-md);
    margin-top: var(--spacing-md);
    border-radius: 5px;
}

.tips strong {
    color: #4ecdc4;
    display: block;
    margin-bottom: var(--spacing-sm);
}

.tips ul {
    margin-left: var(--spacing-md);
}

.tips li {
    margin-bottom: var(--spacing-xs);
}

/* 発声5大要素セクション */
.elements-section {
    background: var(--bg-light);
}

.elements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-lg);
}

.element-card {
    background: white;
    border-radius: 15px;
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
}

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

.element-icon {
    font-size: 3rem;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
}

.element-card h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
    color: #667eea;
}

.element-number {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

.element-card ul {
    list-style: none;
}

.element-card li {
    margin-bottom: var(--spacing-xs);
    padding-left: var(--spacing-sm);
    position: relative;
}

.element-card li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: #667eea;
}

.element-card strong {
    color: #764ba2;
}

/* 声法セクション */
.techniques-section {
    background: white;
}

.tabs {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.tab-btn {
    padding: 0.8rem 2rem;
    border: 2px solid #667eea;
    background: white;
    color: #667eea;
    border-radius: 50px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
}

.tab-btn:hover {
    background: #667eea;
    color: white;
}

.tab-btn.active {
    background: var(--primary-gradient);
    color: white;
    border-color: transparent;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.5s ease-out;
}

.technique-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-lg);
}

.technique-card {
    background: var(--bg-light);
    border-radius: 15px;
    padding: var(--spacing-lg);
    position: relative;
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
    border-top: 4px solid transparent;
}

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

.technique-card:not(.special):not(.expression) {
    border-top-color: #667eea;
}

.technique-card.special {
    border-top-color: #f5576c;
    background: linear-gradient(135deg, #fff5f7 0%, #ffe8ec 100%);
}

.technique-card.expression {
    border-top-color: #4ecdc4;
    background: linear-gradient(135deg, #f0fffe 0%, #e0f7f5 100%);
}

.technique-badge {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    padding: 0.3rem 0.8rem;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
    color: white;
}

.difficulty-beginner {
    background: #4ecdc4;
}

.difficulty-intermediate {
    background: #ffd93d;
    color: var(--text-primary);
}

.difficulty-advanced {
    background: #ff6b6b;
}

.difficulty-expert {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.technique-card h3 {
    font-size: 1.5rem;
    color: #667eea;
    margin-bottom: var(--spacing-xs);
}

.technique-card.special h3 {
    color: #f5576c;
}

.technique-card.expression h3 {
    color: #4ecdc4;
}

.technique-subtitle {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-md);
    font-style: italic;
}

.technique-details p {
    margin-bottom: var(--spacing-sm);
}

.technique-details strong {
    color: #764ba2;
}

.technique-details ol,
.technique-details ul {
    margin-left: var(--spacing-md);
    margin-top: var(--spacing-sm);
}

.technique-details li {
    margin-bottom: var(--spacing-xs);
}

.technique-warning {
    background: #fff3cd;
    border-left: 4px solid #ffc107;
    padding: var(--spacing-sm);
    margin-top: var(--spacing-md);
    border-radius: 5px;
    font-size: 0.9rem;
}

/* トレーニングセクション */
.training-section {
    background: white;
}

.training-levels {
    display: grid;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.level-card {
    background: var(--bg-light);
    border-radius: 15px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.level-header {
    padding: var(--spacing-lg);
    color: white;
    text-align: center;
}

.level-header.beginner {
    background: linear-gradient(135deg, #4ecdc4 0%, #44a8a0 100%);
}

.level-header.intermediate {
    background: linear-gradient(135deg, #ffd93d 0%, #f9ca24 100%);
}

.level-header.advanced {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.level-header h3 {
    font-size: 2rem;
    margin-bottom: var(--spacing-xs);
}

.level-header p {
    opacity: 0.9;
}

.level-content {
    padding: var(--spacing-lg);
    background: white;
}

.level-content h4 {
    color: #667eea;
    font-size: 1.4rem;
    margin-bottom: var(--spacing-md);
}

.level-content ol {
    counter-reset: item;
    list-style: none;
}

.level-content > ol > li {
    counter-increment: item;
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-lg);
    position: relative;
}

.level-content > ol > li::before {
    content: counter(item);
    position: absolute;
    left: 0;
    top: 0;
    background: var(--primary-gradient);
    color: white;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
}

.level-content ul {
    margin-left: var(--spacing-md);
    margin-top: var(--spacing-xs);
}

.level-content ul li {
    margin-bottom: var(--spacing-xs);
}

/* 体づくりセクション */
.body-training {
    background: var(--bg-light);
    border-radius: 20px;
    padding: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.body-training h3 {
    font-size: 2rem;
    color: #667eea;
    text-align: center;
    margin-bottom: var(--spacing-sm);
}

.body-intro {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: var(--spacing-lg);
}

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

.body-card {
    background: white;
    border-radius: 15px;
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
}

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

.body-card h4 {
    color: #667eea;
    font-size: 1.3rem;
    margin-bottom: var(--spacing-md);
}

.body-card h4 i {
    margin-right: var(--spacing-xs);
}

.body-card ul {
    list-style: none;
}

.body-card li {
    margin-bottom: var(--spacing-sm);
    padding-left: var(--spacing-md);
    position: relative;
}

.body-card li::before {
    content: '●';
    position: absolute;
    left: 0;
    color: #4ecdc4;
}

.body-card strong {
    color: #764ba2;
}

/* フッター */
.footer {
    background: linear-gradient(135deg, #2d3436 0%, #000000 100%);
    color: white;
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-content {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.footer-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.footer-logo i {
    font-size: 2rem;
}

.footer-description {
    opacity: 0.8;
    margin-bottom: var(--spacing-lg);
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.footer-links a {
    color: white;
    text-decoration: none;
    opacity: 0.8;
    transition: var(--transition-fast);
}

.footer-links a:hover {
    opacity: 1;
    text-decoration: underline;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255,255,255,0.1);
    opacity: 0.7;
}

.footer-note {
    font-size: 0.9rem;
    margin-top: var(--spacing-xs);
}

/* レスポンシブデザイン */
@media (max-width: 1024px) {
    .anatomy-container {
        grid-template-columns: 1fr;
    }
    
    .technique-grid,
    .methods-grid,
    .body-grid {
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: var(--spacing-lg);
        box-shadow: var(--shadow-lg);
        transition: var(--transition-normal);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .mobile-menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .mobile-menu-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .mobile-menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
    
    .tabs {
        flex-direction: column;
        align-items: center;
    }
    
    .tab-btn {
        width: 100%;
        max-width: 300px;
    }
    
    .anatomy-view-tabs {
        flex-direction: column;
        align-items: center;
    }
    
    .zoom-controls {
        flex-wrap: wrap;
    }
    
    .technique-grid,
    .elements-grid,
    .body-grid,
    .anatomy-images-grid,
    .explanation-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.5rem;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .logo span {
        font-size: 1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
}

/* 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;
    }
}

/* プリント用スタイル */
@media print {
    .header,
    .hero,
    .footer,
    .zoom-controls,
    .tabs,
    .mobile-menu-toggle {
        display: none;
    }
    
    .section {
        page-break-inside: avoid;
    }
}

/* ズーム機能用クラス */
.zoomed {
    transform: scale(1.5);
    transition: transform var(--transition-slow);
}

.zoom-1x {
    transform: scale(1);
}

.zoom-1-5x {
    transform: scale(1.5);
}

.zoom-2x {
    transform: scale(2);
}

/* スクロールアニメーション用 */
.scroll-animate {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.scroll-animate.visible {
    opacity: 1;
    transform: translateY(0);
}