:root {
    --dusty-blue: #5489b4; /* 全面の主役カラー */
    --dusty-blue-dark: #3e6a8e;
    --dusty-blue-light: #7daed9;
    --cream-soft: #fffdf5; /* 文字・アクセント用 */
    --text-white: #ffffff;
    --text-navy: #1a2a3a;
    --accent-pink: #ed8cad;
    --accent-gold: #fcc200;
    --border-navy: #1a2a3a;
    --radius-huge: 80px;
    --radius-mid: 40px;
    --transition: all 0.4s cubic-bezier(0.19, 1, 0.22, 1);
}

*, *::before, *::after {
    box-sizing: border-box;
}

body {
    background-color: var(--dusty-blue); /* 全面ダスティブルー */
    color: var(--text-white);
    margin: 0;
    font-family: 'Zen Maru Gothic', 'Noto Serif JP', serif;
    font-weight: 900;
    overflow-x: hidden;
    line-height: 1.7;
}

/* Layout Container */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 40px;
    position: relative;
}

/* Header: Transparent and Elegant */
header {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border-bottom: 2px solid rgba(255, 255, 255, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}
nav { display: flex; justify-content: space-between; align-items: center; height: 90px; }
.logo { font-family: 'Outfit', sans-serif; font-size: 1.5rem; color: var(--cream-soft); }
.nav-links { display: flex; list-style: none; gap: 3rem; }
.nav-links a { text-decoration: none; color: white; transition: 0.3s; }
.nav-links a:hover { color: var(--accent-gold); }
.btn-nav { background: var(--accent-gold); color: var(--text-navy) !important; padding: 10px 25px; border-radius: 50px; font-weight: 900; }

/* Sections Common */
section { padding: 45px 0; }

/* Hero: Deep Blue with Cream Text */
#hero { background: var(--dusty-blue-dark); border-bottom-left-radius: var(--radius-huge); border-bottom-right-radius: var(--radius-huge); }
.hero-flex { display: grid; grid-template-columns: 1.3fr 0.7fr; gap: 6rem; align-items: center; }
.main-title {
    font-size: clamp(2.5rem, 6.5vw, 4.2rem);
    line-height: 1.3;
    letter-spacing: 0.03em;
    margin-bottom: 2.5rem;
    color: var(--cream-soft);
}
.accent-text { 
    background: var(--accent-pink);
    color: white; 
    padding: 2px 35px;
    border-radius: 40px; 
    display: inline-block;
    font-size: 1.05em;
}
.hero-desc { font-size: 1.4rem; margin-bottom: 4rem; color: rgba(255, 255, 255, 0.9); }
.btn-primary {
    background: var(--accent-gold); color: var(--text-navy);
    padding: 1.8rem 4.5rem; font-size: 1.4rem; text-decoration: none;
    border-radius: 80px; border: 5px solid var(--text-navy);
    box-shadow: 12px 12px 0 var(--text-navy);
    display: inline-block;
}
.btn-primary:hover { transform: translate(-4px, -4px); box-shadow: 16px 16px 0 var(--text-navy); }

.hero-symbol { 
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}
.kurayan-symbol-img { 
    width: 100%; 
    height: auto; 
    max-width: 420px; 
    filter: drop-shadow(20px 20px 0 rgba(0,0,0,0.2));
    transition: var(--transition);
}
.kurayan-symbol-img:hover { transform: scale(1.03) rotate(2deg); }

/* About Grid: Clean Cards */
.section-title { font-size: 3rem; margin-bottom: 5rem; text-align: center; color: var(--cream-soft); }
.section-title.left { text-align: left; }
/* Voice Section: Interactive Cards */
.voice-grid { 
    display: grid; 
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); 
    gap: 2rem; 
    margin-top: 4rem;
}
.voice-card {
    background: white;
    color: var(--text-navy);
    padding: 3rem;
    border-radius: var(--radius-mid);
    border: 5px solid var(--text-navy);
    box-shadow: 15px 15px 0 var(--dusty-blue-light);
    display: flex;
    gap: 2rem;
    align-items: center;
    transition: var(--transition);
}
.voice-card:hover { transform: translateY(-8px); box-shadow: 20px 20px 0 var(--accent-pink); }
.voice-img { 
    width: 120px; 
    height: 120px; 
    border-radius: 50%; 
    border: 3px solid var(--text-navy); 
    object-fit: cover;
    flex-shrink: 0;
}
.voice-text { font-family: 'Zen Maru Gothic'; font-size: 1.1rem; line-height: 1.6; margin-bottom: 1rem; position: relative; }
.voice-text::before { content: '“'; font-size: 3rem; position: absolute; top: -1.5rem; left: -1rem; opacity: 0.2; color: var(--dusty-blue); }
.voice-text-only { font-family: 'Zen Maru Gothic'; font-size: 1.2rem; line-height: 1.6; border-left: 6px solid var(--dusty-blue); padding-left: 1.5rem; font-style: italic; }
.voice-author { font-weight: 900; font-size: 1rem; border-top: 1px solid #ddd; padding-top: 1rem; margin-top: 1rem; }
.voice-sub { font-size: 0.85rem; opacity: 0.7; font-weight: normal; }
.voice-placeholder-icon { 
    width: 120px; 
    height: 120px; 
    border-radius: 50%; 
    background: var(--dusty-blue-light); 
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 3rem;
    border: 3px solid var(--text-navy);
    flex-shrink: 0;
}

@media (max-width: 600px) {
    .voice-grid { grid-template-columns: 1fr; }
    .voice-card { flex-direction: column; text-align: center; }
}

/* Lesson Grid */
.lesson-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 3rem; margin-top: 5rem; }
.lesson-card { 
    background: rgba(255, 255, 255, 0.15); 
    border: 4px solid var(--dusty-blue-light);
    padding: 4rem 3rem; 
    border-radius: var(--radius-mid); 
    text-align: center;
    transition: var(--transition);
    backdrop-filter: blur(5px);
}
.lesson-card.highlight { 
    background: rgba(255, 255, 255, 0.25); 
    border: 4px solid var(--accent-gold); 
}
.lesson-card:hover { 
    transform: translateY(-10px); 
    background: rgba(255, 255, 255, 0.18); 
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
}
.lesson-icon { font-size: 3.5rem; margin-bottom: 2rem; }
.lesson-card h3 { font-size: 1.8rem; margin-bottom: 1.5rem; color: var(--accent-gold); }

/* Pricing Table: Clean & Modern */
.price-container { display: flex; justify-content: center; gap: 3rem; margin-top: 5rem; flex-wrap: wrap; }
.price-column { 
    background: white; color: var(--text-navy); 
    padding: 4rem; border-radius: var(--radius-mid); 
    width: 450px; border: 5px solid var(--text-navy);
    position: relative; box-shadow: 15px 15px 0 var(--text-navy);
}
.price-column.popular { border-color: var(--accent-gold); box-shadow: 15px 15px 0 var(--accent-gold); }
.price-badge { 
    position: absolute; top: -20px; right: 40px; 
    background: var(--accent-gold); color: var(--text-navy); 
    padding: 8px 25px; border-radius: 40px; font-weight: 900;
}
.price-header { font-size: 1.8rem; margin-bottom: 1.5rem; border-bottom: 2px solid #eee; padding-bottom: 1.5rem; }
.price-value { font-size: 3.5rem; font-family: 'Outfit'; color: var(--dusty-blue-dark); margin-bottom: 2.5rem; }
.price-value span { font-size: 1.2rem; }
.price-features { list-style: none; padding: 0; margin: 0; }
.price-features li { padding: 12px 0; border-bottom: 1px dotted #ccc; }
.price-table { width: 100%; margin-top: 2rem; border-collapse: collapse; }
.price-table td { padding: 15px 0; border-bottom: 1px solid #eee; font-size: 1.2rem; }
.price-table td:last-child { text-align: right; font-weight: 900; color: var(--dusty-blue-dark); }
.price-note { font-size: 0.9rem; margin-top: 2rem; opacity: 0.7; }

/* System Info Box */
.system-box { 
    margin-top: 6rem; background: rgba(255, 255, 255, 0.05); 
    padding: 5rem; border-radius: var(--radius-huge); 
    border: 3px dashed rgba(255, 255, 255, 0.2);
}
.system-box h3 { font-size: 2.2rem; margin-bottom: 4rem; text-align: center; }
.system-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 3rem; }
.system-item h4 { color: var(--accent-pink); font-size: 1.4rem; margin-bottom: 1rem; }

.section-cta { text-align: center; margin-top: 5rem; }
.btn-gold-wide { 
    background: var(--accent-gold); color: var(--text-navy); 
    padding: 20px 60px; border-radius: 60px; font-weight: 900;
    font-size: 1.2rem; display: inline-block; text-decoration: none;
    box-shadow: 0 15px 30px rgba(234,179,8,0.2); transition: 0.3s;
}
.btn-gold-wide:hover { transform: translateY(-3px); box-shadow: 0 20px 40px rgba(234,179,8,0.3); }

/* RPG Section: Solid Highlight */
#rpg { background: var(--cream-soft); color: var(--text-navy); border-radius: var(--radius-huge); position: relative; z-index: 1; padding: 150px 0; }
#rpg .section-title { color: var(--text-navy); margin-bottom: 2rem; }
.rpg-content-box { display: grid; grid-template-columns: 1fr 1fr; gap: 6rem; align-items: center; }
.hana-img { width: 100%; border-radius: var(--radius-mid); border: 6px solid var(--text-navy); box-shadow: 20px 20px 0 var(--dusty-blue); }
.rpg-placeholder {
    width: 100%; aspect-ratio: 4/3; background: rgba(0,0,0,0.03); 
    border: 4px dashed var(--dusty-blue-light); border-radius: var(--radius-mid);
    display: flex; flex-direction: column; justify-content: center; align-items: center;
    color: var(--dusty-blue); text-align: center;
}
.placeholder-icon { font-size: 5rem; margin-bottom: 1rem; opacity: 0.5; }
.status-badge { 
    background: var(--accent-pink); color: white; padding: 5px 20px; border-radius: 40px; 
    font-size: 0.9rem; margin-bottom: 2rem; display: inline-block; font-family: 'Outfit';
    font-weight: 900; letter-spacing: 0.1em;
}
.tag { background: var(--text-navy); color: white; padding: 6px 20px; border-radius: 50px; font-size: 0.85rem; margin-bottom: 2rem; display: inline-block; }
.btn-primary { 
    background: rgba(255, 107, 156, 0.15); color: white; 
    border: 2px solid var(--accent-pink);
    padding: 18px 45px; border-radius: 60px; font-weight: 900; font-size: 1.1rem; 
    box-shadow: 0 10px 20px rgba(255, 107, 156, 0.1); 
    text-decoration: none; display: inline-block; transition: 0.3s;
}
.btn-primary:hover { background: rgba(255, 107, 156, 0.25); transform: translateY(-3px); }
.btn-secondary { 
    background: rgba(255,255,255,0.1); color: white; border: 2px solid rgba(255,255,255,0.4);
    padding: 18px 45px; border-radius: 60px; font-weight: bold;
    text-decoration: none; display: inline-block; transition: 0.3s;
}
.btn-secondary:hover { background: rgba(255,255,255,0.2); border-color: white; }
.hero-actions { display: flex; gap: 2rem; margin-top: 4rem; }
.btn-outline.disabled { 
    opacity: 0.5; border-color: #999; color: #999; cursor: not-allowed; pointer-events: none; 
}
.btn-outline { 
    border: 4px solid var(--text-navy); padding: 15px 40px; 
    border-radius: 60px; text-decoration: none; color: var(--text-navy); 
    display: inline-block; margin-top: 3rem; transition: 0.3s;
}
.btn-outline:hover { background: var(--text-navy); color: white; }

/* Instructor Layout: Grid for Desktop */
#teacher .teacher-flex { 
    display: grid !important; 
    grid-template-columns: 1fr 1fr !important; 
    gap: 0 4rem; 
    align-items: center; 
}
#teacher .teacher-flex .section-title.left { grid-column: 1; grid-row: 1; justify-self: end; width: 100%; max-width: 500px; margin-bottom: 0.5rem; }
#teacher .teacher-flex .name-block { grid-column: 1; grid-row: 2; justify-self: end; width: 100%; max-width: 500px; }
#teacher .teacher-flex .natsu-item { grid-column: 2; grid-row: 1 / span 2; justify-self: start; align-self: start; margin-top: 7.5rem; }
#teacher .teacher-flex .instructor-bio { grid-column: 1; grid-row: 3; justify-self: end; width: 100%; max-width: 500px; margin-top: 1.5rem; }
#teacher .teacher-flex .kurayan-item { grid-column: 2; grid-row: 3; justify-self: start; align-self: center; margin-top: 1rem; }
#teacher .teacher-flex .teacher-quote-area { grid-column: 1 / span 2; grid-row: 4; margin-top: 4rem; text-align: center; }

.avatar-item { text-align: center; }
.instructor-avatar, .guide-avatar { 
    width: 200px; height: 200px; 
    border-radius: 50%; border: 6px solid var(--dusty-blue); 
    background: white; object-fit: cover;
    box-shadow: 12px 12px 0 var(--dusty-blue-light);
    transition: var(--transition);
}
.instructor-avatar:hover, .guide-avatar:hover { transform: translateY(-10px); }
.avatar-label { font-size: 1rem; color: var(--cream-soft); margin-top: 1.2rem; font-weight: bold; opacity: 0.9; }

.quote { 
    font-size: 1.5rem; 
    display: inline-block;
    border-left: 10px solid var(--accent-pink); 
    padding: 15px 0 15px 40px; 
    font-style: italic; 
    color: var(--cream-soft); 
    text-align: left;
    max-width: 900px;
}

.name-block h3 { font-size: 2.5rem; margin: 0.5rem 0; color: var(--cream-soft); }
.sls-label { background: white; color: var(--dusty-blue); padding: 5px 20px; border-radius: 50px; display: inline-block; font-size: 1rem; }

.instructor-bio { margin: 1.5rem 0; }
.bio-text { line-height: 1.7; color: rgba(255, 255, 255, 0.9); font-size: 1rem; }
.bio-creds-small { margin-top: 1.2rem; opacity: 0.7; line-height: 1.4; }
.bio-creds-small small { font-size: 0.8rem; }

/* CTA: Improved with LINE Focus */
.cta-box {
    background: var(--dusty-blue-dark); border: none;
    border-radius: var(--radius-huge); padding: 80px 40px; text-align: center;
    box-shadow: 20px 20px 0 var(--accent-gold);
    position: relative; overflow: hidden;
}
.cta-icon { font-size: 3rem; margin-bottom: 1.5rem; opacity: 0.8; }
.cta-title { font-size: 3rem; margin-bottom: 1.5rem; color: var(--cream-soft); line-height: 1.2; }
.cta-text { font-size: 1.2rem; margin-bottom: 3rem; opacity: 0.9; line-height: 1.8; }
.cta-btns { display: flex; justify-content: center; }

.btn-line { 
    background: #06C755; color: white; padding: 1.5rem 3.5rem; 
    border-radius: 80px; text-decoration: none; border: none;
    font-size: 1.3rem; font-weight: 900; transition: 0.3s;
    display: flex; align-items: center; gap: 1rem;
    box-shadow: 0 10px 20px rgba(6, 199, 85, 0.3);
}
.btn-line:hover { background: #05b34c; transform: translateY(-5px); box-shadow: 0 15px 30px rgba(6, 199, 85, 0.4); }
.line-ico { width: 32px; height: 32px; }

/* Footer */
footer { padding: 60px 0; border-top: 2px solid rgba(255, 255, 255, 0.1); text-align: center; opacity: 0.8; }

/* Burger Menu */
.menu-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 6px;
}
.menu-toggle .bar {
    width: 30px;
    height: 3px;
    background-color: white;
    border-radius: 2px;
    transition: 0.3s;
}

/* Responsive adjustments */
@media (max-width: 900px) {
    header { padding: 10px 0; }
    .container { padding: 0 25px; }
    
    /* Mobile Navigation */
    .menu-toggle { display: flex; z-index: 1001; }
    .nav-links {
        position: fixed;
        right: -100%;
        top: 0;
        flex-direction: column;
        background: var(--dusty-blue-dark);
        width: 80%;
        height: 100vh;
        padding: 80px 40px;
        transition: 0.4s;
        box-shadow: -10px 0 30px rgba(0,0,0,0.3);
        gap: 1.5rem;
        z-index: 1000;
        overflow-y: auto; /* たてスクロールを許可 */
        -webkit-overflow-scrolling: touch;
    }
    .nav-links li:last-child { margin-bottom: 50px; } /* 最後の項目の下に余白 */
    .nav-links.active { right: 0; }
    .nav-links li { width: 100%; }
    .nav-links a { font-size: 1.5rem; display: block; }

    .hero-flex, .rpg-content-box, .teacher-flex { grid-template-columns: 1fr; text-align: center; }
    .voice-grid, .lesson-grid, .price-container, .system-grid { grid-template-columns: 1fr; }
    .hero-flex { gap: 4rem; }
    .section-title.left { text-align: center; }
    .quote { border-left: none; border-top: 8px solid var(--accent-pink); padding: 30px 0 0 0; }
    .cta-btns { flex-direction: column; gap: 1.5rem; }
    .price-column { width: 100%; max-width: 450px; margin: 0 auto; }
    
    /* Instructor Section for Mobile */
    .teacher-flex { 
        display: flex !important; 
        flex-direction: column !important; 
        gap: 0 !important; 
    }

    .teacher-flex .section-title.left { grid-column: auto; grid-row: auto; margin-top: 0; margin-bottom: 0; text-align: center; justify-self: center; }
    .teacher-flex .name-block { grid-column: auto; grid-row: auto; text-align: center; margin-bottom: 0.5rem; justify-self: center; }
    .teacher-flex .natsu-item { grid-column: auto; grid-row: auto; margin-top: 1.5rem; margin-bottom: 1.5rem; justify-self: center; }
    .teacher-flex .instructor-bio { grid-column: auto; grid-row: auto; text-align: left; padding: 0 10px; margin-bottom: 2rem; justify-self: center; max-width: 100%; }
    .teacher-flex .kurayan-item { grid-column: auto; grid-row: auto; margin-bottom: 2.5rem; justify-self: center; }
    .teacher-flex .teacher-quote-area { grid-column: auto; grid-row: auto; margin-top: 1rem; }

    .instructor-avatar, .guide-avatar { width: 180px; height: 180px; margin: 0 auto; }
    .avatar-item { width: 100%; }
    .main-title { font-size: 2.8rem; }
    .hero-desc { font-size: 1.1rem; }
    .btn-primary { padding: 1.2rem 2.5rem; font-size: 1.1rem; }
}

/* Sub Page Styles (Trial Lesson) */
.sub-hero { padding: 120px 0 60px; text-align: center; }
.sub-title { font-size: 3.5rem; color: var(--cream-soft); margin-bottom: 1.5rem; }
.sub-lead { font-size: 1.2rem; opacity: 0.9; line-height: 1.8; }

.trial-info-box { margin-bottom: 5rem; text-align: center; }
.trial-price-card { 
    background: white; color: var(--text-navy);
    padding: 4rem; border-radius: 40px; display: inline-block;
    box-shadow: 20px 20px 0 var(--dusty-blue-dark);
}
.trial-price-card h2 { font-size: 2rem; margin: 1rem 0; }
.price-big { font-size: 5rem; font-weight: 900; color: var(--dusty-blue); }
.price-big span { font-size: 1.5rem; color: var(--text-navy); opacity: 0.5; }

.message-area { margin-bottom: 6rem; }
.message-card { 
    background: rgba(255, 255, 255, 0.05); 
    border: 2px solid rgba(255, 255, 255, 0.1);
    padding: 4rem; border-radius: 40px; text-align: center;
}
.message-card h3 { font-size: 2rem; margin-bottom: 2rem; color: var(--accent-gold); }
.message-card p { font-size: 1.1rem; line-height: 2; color: var(--cream-soft); max-width: 800px; margin: 0 auto 2.5rem; }
.safe-badge { 
    display: inline-block; background: var(--dusty-blue-dark); 
    padding: 10px 30px; border-radius: 50px; font-weight: bold; font-size: 1rem;
}

.trial-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; margin-bottom: 6rem; }
.info-card { 
    background: white; color: var(--text-navy); padding: 3rem; border-radius: 30px;
    text-align: left; transition: 0.3s;
}
.info-card.wide.cancel-policy { 
    display: flex; 
    align-items: center; 
    gap: 3rem; 
    grid-column: span 2; 
}
.cancel-text { flex: 1; }
.kurayan-mini { 
    width: 220px; 
    height: 220px; 
    object-fit: contain;
    filter: drop-shadow(10px 10px 0 var(--dusty-blue-light));
}

@media (max-width: 900px) {
    .sub-title { font-size: 2.5rem; }
    .trial-grid { grid-template-columns: 1fr; }
    .info-card.wide { grid-column: auto; }
    .info-card.wide.cancel-policy { flex-direction: column; text-align: center; gap: 2rem; }
    .info-card.wide.cancel-policy .icon { margin: 0 auto 1.5rem; }
    .trial-price-card { padding: 3rem 1.5rem; width: 100%; }
    .message-card { padding: 2.5rem 1.5rem; }
}