:root{--light-blue: #60a5fa;--medium-blue: #2563eb;--navy: #1e3a5f;--primary-color: #2563eb;--secondary-color: #1e3a5f;--accent-color: #60a5fa;--text-color: #1e293b;--text-light: #64748b;--bg-light: #f8fafc;--border-color: #e2e8f0;--white: #ffffff;--gradient-primary: linear-gradient(135deg, var(--medium-blue) 0%, var(--navy) 100%);--gradient-header: linear-gradient(135deg, var(--secondary-color) 0%, var(--medium-blue) 100%);--gradient-hero: linear-gradient(135deg, var(--secondary-color) 0%, #2d5a87 100%);--gradient-tag: linear-gradient(135deg, var(--light-blue) 0%, var(--medium-blue) 100%);--shadow-sm: 0 2px 8px rgba(0, 0, 0, .05);--shadow-md: 0 4px 20px rgba(0, 0, 0, .08);--shadow-lg: 0 8px 30px rgba(0, 0, 0, .1);--shadow-blue: 0 4px 15px rgba(37, 99, 235, .3);--shadow-blue-hover: 0 8px 25px rgba(37, 99, 235, .4)}*{margin:0;padding:0;box-sizing:border-box}html,body{overflow-x:hidden}body{font-family:Helvetica Neue,Arial,Hiragino Kaku Gothic ProN,Hiragino Sans,Meiryo,sans-serif;color:var(--text-color);line-height:1.8;background:var(--white)}.fas,.far,.fa-solid,.fa-regular{font-family:"Font Awesome 6 Free"!important;font-weight:900}.fab,.fa-brands{font-family:"Font Awesome 6 Brands"!important}.container{max-width:1000px;margin:0 auto;padding:0 20px}section{padding:80px 20px}.section-header{text-align:center;margin-bottom:50px}.section-tag{display:inline-block;background:linear-gradient(135deg,var(--light-blue) 0%,var(--medium-blue) 100%);color:var(--white);padding:6px 20px;border-radius:30px;font-weight:700;font-size:.8rem;margin-bottom:18px;letter-spacing:2px;text-transform:uppercase}.section-header h2{font-size:2.2rem;margin-bottom:12px;color:var(--secondary-color);font-weight:800;letter-spacing:-.5px}.section-header p{color:var(--text-light);font-size:1rem}.cta-button{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:linear-gradient(135deg,var(--medium-blue) 0%,var(--navy) 100%);color:var(--white);padding:18px 40px;border-radius:8px;text-decoration:none;font-weight:700;font-size:1.1rem;transition:all .3s;box-shadow:0 4px 15px #2563eb4d;border:none;cursor:pointer}.cta-button:hover{transform:translateY(-3px);box-shadow:0 8px 25px #2563eb66}.cta-button.secondary{background:transparent;border:2px solid var(--white);color:var(--white);box-shadow:none}.cta-button.secondary:hover{background:#ffffff1a;transform:translateY(-3px)}.cta-section{background:linear-gradient(135deg,var(--secondary-color) 0%,var(--medium-blue) 100%);padding:80px 20px;text-align:center;color:var(--white)}.cta-section h2{font-size:1.8rem;margin-bottom:15px}.cta-section p{opacity:.9;margin-bottom:30px;line-height:1.8}.cta-section .cta-button{background:var(--white);color:var(--secondary-color);box-shadow:0 4px 15px #0003}.cta-section .cta-button:hover{transform:translateY(-3px);box-shadow:0 10px 30px #0000004d}.page-header{background:linear-gradient(135deg,var(--secondary-color) 0%,var(--medium-blue) 100%);color:var(--white);padding:140px 20px 60px;text-align:center}.page-header h1{font-size:2.5rem;font-weight:800;margin-bottom:15px}.page-header p{font-size:1.1rem;opacity:.9}.youtube-wrap{margin:0 auto;max-width:700px}.youtube-container{position:relative;padding-bottom:56.25%;height:0;overflow:hidden;border-radius:12px;box-shadow:0 4px 20px #0000001a}.youtube-container iframe{position:absolute;top:0;left:0;width:100%;height:100%}.book-card{display:flex;align-items:center;gap:25px;background:var(--bg-light);padding:25px;border-radius:12px;text-decoration:none;transition:all .3s;border:1px solid var(--border-color)}.book-card:hover{transform:translateY(-3px);box-shadow:0 10px 25px #00000014;border-color:var(--medium-blue)}.book-card img{width:100px;height:auto;border-radius:6px;box-shadow:0 4px 15px #00000026}.book-publisher{font-size:.8rem;color:var(--text-light);margin-bottom:5px}.book-title{font-size:1.1rem;color:var(--secondary-color);font-weight:700;margin-bottom:5px}.book-subtitle{font-size:.9rem;color:var(--text-light);margin-bottom:12px}.book-link{font-size:.9rem;color:var(--medium-blue);font-weight:600}.sp-only{display:none}.container-narrow{max-width:800px;margin:0 auto;padding:0 20px}.container-wide{max-width:1200px;margin:0 auto;padding:0 20px}.hover-lift{transition:all .3s}.hover-lift:hover{transform:translateY(-3px);box-shadow:var(--shadow-md)}.card{background:var(--white);border-radius:12px;padding:25px;transition:all .3s;border:1px solid var(--border-color)}.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md)}.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:25px}.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:25px}.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}.section-intro{text-align:center;color:var(--text-light);max-width:600px;margin:0 auto 50px;line-height:1.8}@media(max-width:768px){.sp-only{display:inline}section{padding:60px 20px}.section-header h2{font-size:1.8rem}.section-header{margin-bottom:40px}.page-header{padding:120px 20px 50px}.page-header h1{font-size:2rem}.cta-section h2{font-size:1.5rem}.book-card{flex-direction:column;text-align:center}.book-card img{width:120px}.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}}.lp-nav{position:fixed;top:0;left:0;right:0;background:#fff;z-index:1000;padding:15px 0;border-bottom:1px solid #e2e8f0}.lp-nav .container{display:flex;justify-content:space-between;align-items:center;max-width:1000px;margin:0 auto;padding:0 20px}.nav-logo{display:flex;align-items:center;text-decoration:none}.nav-logo-img{height:48px;width:auto}.hamburger{display:none;flex-direction:column;justify-content:center;gap:5px;width:30px;height:30px;background:none;border:none;cursor:pointer;padding:0;z-index:1001}.hamburger span{display:block;width:100%;height:2px;background:var(--secondary-color, #1e3a5f);transition:all .3s}.hamburger.active span:nth-child(1){transform:rotate(45deg) translate(5px,5px)}.hamburger.active span:nth-child(2){opacity:0}.hamburger.active span:nth-child(3){transform:rotate(-45deg) translate(5px,-5px)}.nav-links{display:flex;align-items:center;gap:25px}.nav-links a{color:var(--text-color, #1e293b);text-decoration:none;font-size:.9rem;font-weight:500;transition:color .3s}.nav-links a:hover{color:var(--primary-color, #2563eb)}.nav-cta{background:var(--primary-color, #2563eb);color:#fff!important;padding:10px 22px;border-radius:8px;font-weight:600!important;transition:all .3s}.nav-cta:hover{background:var(--secondary-color, #1e3a5f);transform:translateY(-1px)}.nav-overlay{display:none;position:fixed;inset:0;background:#00000080;z-index:999;opacity:0;transition:opacity .3s}.nav-overlay.active{display:block;opacity:1}@media(max-width:768px){.hamburger{display:flex}.nav-links{position:fixed;top:0;right:-280px;width:280px;height:100vh;background:#fff;flex-direction:column;align-items:stretch;justify-content:flex-start;padding:80px 30px 30px;gap:0;box-shadow:-5px 0 20px #0000001a;transition:right .3s ease;z-index:1000}.nav-links.active{right:0}.nav-links a{padding:18px 0;border-bottom:1px solid var(--border-color, #e2e8f0);font-size:1rem}.nav-links a:last-child{border-bottom:none}.nav-cta{margin-top:20px;text-align:center;padding:15px 22px}}footer[data-astro-cid-sz7xmlte]{background:var(--secondary-color);color:#fffc;text-align:center;padding:40px 20px}footer[data-astro-cid-sz7xmlte] strong[data-astro-cid-sz7xmlte]{color:#fff;font-size:1.1rem}footer[data-astro-cid-sz7xmlte] a[data-astro-cid-sz7xmlte]{color:#60a5fa}