:root{--bg:#f8fafb;--white:#fff;--teal:#0891b2;--teal-dark:#0e7490;--teal-light:#e0f7fa;--teal-dim:rgba(8,145,178,0.08);--teal-mid:rgba(8,145,178,0.15);--sky:#38bdf8;--green:#059669;--green-dim:rgba(5,150,105,0.1);--amber:#d97706;--amber-dim:rgba(217,119,6,0.1);--text:#0f172a;--text-mid:#475569;--text-muted:#94a3b8;--border:#e2e8f0;--shadow:0 2px 20px rgba(8,145,178,0.07);--shadow-lg:0 12px 48px rgba(8,145,178,0.12);--radius:18px;--radius-sm:10px;}
*{margin:0;padding:0;box-sizing:border-box;}html{scroll-behavior:smooth;}
body{font-family:'Noto Sans JP',sans-serif;background:var(--bg);color:var(--text);line-height:1.7;overflow-x:hidden;}
header{background:rgba(255,255,255,0.92);backdrop-filter:blur(16px);border-bottom:1px solid var(--border);padding:0 24px;display:flex;align-items:center;justify-content:space-between;height:64px;position:sticky;top:0;z-index:100;box-shadow:0 1px 16px rgba(8,145,178,0.06);}
.logo{font-family:'DM Serif Display',serif;font-size:22px;color:var(--text);text-decoration:none;display:flex;align-items:center;gap:10px;}
.logo-drop{width:32px;height:32px;background:linear-gradient(135deg,var(--teal),var(--sky));border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:15px;color:#fff;box-shadow:0 4px 12px rgba(8,145,178,0.3);}
.logo em{color:var(--teal);font-style:normal;}
.header-nav{display:flex;gap:4px;}
.nav-link{font-size:13px;color:var(--text-mid);text-decoration:none;padding:7px 14px;border-radius:8px;font-weight:500;font-family:'DM Sans',sans-serif;transition:all 0.2s;}
.nav-link:hover{background:var(--teal-dim);color:var(--teal);}
.header-note{font-size:10px;color:var(--text-muted);font-family:'DM Sans',sans-serif;}
.hero{background:linear-gradient(160deg,#065f46 0%,#059669 45%,#34d399 100%);padding:64px 24px 72px;text-align:center;}
.hero-eyebrow{font-family:'DM Sans',sans-serif;font-size:11px;font-weight:700;letter-spacing:0.2em;color:rgba(255,255,255,0.6);margin-bottom:14px;}
.hero h1{font-family:'DM Serif Display',serif;font-size:clamp(28px,5vw,52px);color:#fff;line-height:1.1;letter-spacing:-0.02em;margin-bottom:18px;}
.hero h1 em{font-style:normal;color:#fde68a;}
.hero p{font-size:14px;color:rgba(255,255,255,0.85);max-width:600px;margin:0 auto 28px;line-height:1.9;font-family:'DM Sans',sans-serif;}
.hero-chips{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;}
.hero-chip{background:rgba(255,255,255,0.12);border:1px solid rgba(255,255,255,0.25);color:#fff;font-size:12px;font-weight:600;padding:6px 16px;border-radius:100px;font-family:'DM Sans',sans-serif;}
.manga-shell{width:min(1080px,calc(100% - 40px));margin:0 auto;padding:28px 0 64px;}
.crumbs{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-bottom:24px;font-size:12px;color:var(--text-muted);}
.crumbs a{color:var(--teal-dark);text-decoration:none;}.crumbs span+span::before,.crumbs a+span::before{content:'/';margin-right:8px;color:var(--text-muted);}
.episode-hero{position:static;height:auto;display:block;background:linear-gradient(145deg,var(--teal-light),#fff);border:1px solid var(--teal-mid);border-radius:24px;padding:46px;text-align:left;box-shadow:var(--shadow);margin-bottom:34px;}
.episode-hero .eyebrow,.section-eyebrow{font-family:'DM Sans',sans-serif;font-size:11px;font-weight:700;letter-spacing:.18em;color:var(--teal);margin-bottom:8px;}
.episode-hero h1,.series-section h2,.lesson h2,.data-links h2,.faq-section h2{font-family:'DM Serif Display',serif;letter-spacing:-.02em;line-height:1.25;}
.episode-hero h1{font-size:clamp(28px,5vw,48px);margin-bottom:16px;}
.episode-lead{max-width:720px;color:var(--text-mid);font-size:15px;}
.reading-chip{display:inline-block;margin-top:20px;padding:6px 14px;border-radius:100px;background:var(--teal);color:#fff;font:700 12px 'DM Sans',sans-serif;}
.comic{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin:0 0 48px;}
.comic-panel-art{position:relative;border:4px solid #0f172a;border-radius:14px;overflow:hidden;background:#fff;box-shadow:var(--shadow);}
.comic-panel-art svg{width:100%;height:auto;display:block;}
.panel-number{position:absolute;top:10px;left:10px;width:34px;height:34px;border:3px solid #0f172a;border-radius:50%;display:grid;place-items:center;background:#fff;font:700 15px 'DM Sans',sans-serif;}
.comic-panel-art figcaption{padding:14px 16px;border-top:3px solid #0f172a;background:#fff;font-size:13px;color:var(--text-mid);}
.lesson,.data-links,.faq-section,.series-section,.editor-note{margin-top:48px;}
.lesson h2,.data-links h2,.faq-section h2,.series-section h2{font-size:clamp(24px,4vw,34px);margin-bottom:20px;}
.lesson-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:14px;}
.lesson-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius-sm);padding:20px;box-shadow:var(--shadow);}
.lesson-card h3{font-size:15px;margin-bottom:7px;color:var(--teal-dark);}.lesson-card p{font-size:13px;color:var(--text-mid);}
.number-example{margin-top:18px;padding:24px;background:var(--amber-dim);border:1px solid rgba(217,119,6,.25);border-radius:var(--radius);}
.number-example h3{font-size:17px;color:var(--amber);margin-bottom:8px;}.number-example p{font-size:14px;color:var(--text-mid);}
.data-link-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;}
.data-link-grid a{display:block;background:#fff;border:1px solid var(--border);border-radius:var(--radius-sm);padding:16px 18px;color:var(--teal-dark);font-weight:700;text-decoration:none;transition:transform .2s,border-color .2s;}
.data-link-grid a:hover{transform:translateY(-2px);border-color:var(--teal);}
.source-note{margin-top:24px;padding:16px 18px;background:var(--teal-dim);border-radius:var(--radius-sm);font-size:12px;color:var(--text-mid);}
.source-note a{color:var(--teal-dark);font-weight:700;}
.episode-nav{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:36px;}
.episode-nav a{padding:18px;background:var(--text);color:#fff;border-radius:var(--radius-sm);text-decoration:none;font-size:13px;}
.episode-nav a:last-child{text-align:right;}.episode-nav .disabled{visibility:hidden;}
.faq-item{border:1px solid var(--border);border-radius:var(--radius-sm);margin-bottom:10px;overflow:hidden;}
.faq-q{padding:16px 20px;font-size:13px;font-weight:700;color:var(--text);cursor:pointer;display:flex;justify-content:space-between;align-items:center;background:#fff;font-family:'DM Sans',sans-serif;}
.faq-q::after{content:'＋';color:var(--teal);font-size:16px;flex-shrink:0;}
.faq-item.open .faq-q::after{content:'－';}
.faq-a{padding:0 20px;font-size:13px;color:var(--text-mid);line-height:1.9;max-height:0;overflow:hidden;transition:max-height 0.3s,padding 0.3s;background:var(--teal-dim);}
.faq-item.open .faq-a{padding:16px 20px;max-height:400px;}
.series-hero{display:grid;grid-template-columns:minmax(0,1fr) minmax(360px,520px);align-items:center;gap:38px;text-align:left;}
.series-hero-copy{max-width:560px;margin-left:auto;}.series-hero p{margin:0 0 24px;}.series-hero-art{border:4px solid #0f172a;border-radius:18px;overflow:hidden;background:#fff;box-shadow:var(--shadow-lg);}
.series-hero-art svg{width:100%;height:auto;display:block;}
.episode-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;}
.episode-card{display:flex;flex-direction:column;background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:24px;color:var(--text);text-decoration:none;box-shadow:var(--shadow);}
.episode-card .episode-label{font:700 11px 'DM Sans',sans-serif;letter-spacing:.15em;color:var(--teal);}.episode-card h3{font-size:18px;line-height:1.5;margin:8px 0;}.episode-card p{font-size:13px;color:var(--text-mid);}.episode-card strong{color:var(--teal-dark);margin-top:auto;padding-top:18px;font-size:13px;}
.roadmap{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;counter-reset:road;}
.road-step{position:relative;background:var(--teal-dim);border-radius:var(--radius);padding:24px;counter-increment:road;}.road-step::before{content:counter(road);position:absolute;top:-16px;left:20px;width:34px;height:34px;display:grid;place-items:center;border-radius:50%;background:var(--teal);color:#fff;font:700 14px 'DM Sans',sans-serif;}.road-step h3{font-size:16px;margin:8px 0;}.road-step p{font-size:13px;color:var(--text-mid);}
.editor-note{border-left:4px solid var(--teal);background:#fff;padding:22px 24px;border-radius:0 var(--radius-sm) var(--radius-sm) 0;font-size:13px;color:var(--text-mid);}
footer{background:var(--text);padding:36px 24px;}
.footer-inner{max-width:1000px;margin:0 auto;display:flex;justify-content:space-between;align-items:flex-start;flex-wrap:wrap;gap:24px;margin-bottom:24px;}
.footer-logo{font-family:'DM Serif Display',serif;font-size:22px;color:#fff;margin-bottom:6px;}
.footer-logo em{color:var(--sky);font-style:normal;}
.footer-tagline{font-size:12px;color:rgba(255,255,255,0.4);font-family:'DM Sans',sans-serif;margin-bottom:12px;}
.footer-links{display:flex;gap:16px;}
.footer-links a{font-size:11px;color:rgba(255,255,255,0.4);text-decoration:none;font-family:'DM Sans',sans-serif;}
.footer-nav{display:flex;gap:20px;flex-wrap:wrap;}
.footer-nav a{font-size:12px;color:rgba(255,255,255,0.5);text-decoration:none;font-family:'DM Sans',sans-serif;}
.footer-copy{max-width:1000px;margin:0 auto;font-size:11px;color:rgba(255,255,255,0.3);line-height:1.8;font-family:'DM Sans',sans-serif;border-top:1px solid rgba(255,255,255,0.08);padding-top:20px;}
@media(max-width:850px){.comic,.series-hero,.episode-cards,.roadmap{grid-template-columns:1fr;}.series-hero{text-align:center;}.series-hero-copy{margin:0 auto;}.series-hero-art{max-width:600px;margin:0 auto;}.episode-card{min-height:0;}}
@media(max-width:768px){.header-nav{display:none;}}
@media(max-width:560px){.manga-shell{width:min(100% - 24px,1080px);padding-top:18px;}.episode-hero{padding:28px 20px;border-radius:18px;}.data-link-grid,.episode-nav{grid-template-columns:1fr;}.episode-nav a:last-child{text-align:left;}.series-hero{padding:42px 12px;}.hero-chips{align-items:center;}.comic-panel-art figcaption{padding:12px;font-size:12px;}.lesson-grid{grid-template-columns:1fr;}header{padding:0 14px;}.header-note{display:none;}.logo{font-size:20px;}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto;}*,*::before,*::after{animation:none!important;transition:none!important;}}