:root{
  --bg:#fffaf2; --ink:#23202b; --muted:#6b6577; --accent:#e4572e; --accent2:#2a6fdb;
  --card:#ffffff; --line:#eadfd2; --ok:#1e7d46; --ng:#b3261e; --radius:14px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Hiragino Kaku Gothic ProN","Noto Sans JP",sans-serif;
  line-height:1.65}
a{color:var(--accent2)}
.wrap{max-width:960px;margin:0 auto;padding:0 20px}
.site-header{background:#23202b;color:#fff}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;padding:14px 20px;gap:16px;flex-wrap:wrap}
.logo{color:#fff;text-decoration:none;font-weight:800;font-size:1.25rem;letter-spacing:.02em}
.logo span{color:#ffb59d}
.site-nav{display:flex;gap:18px;flex-wrap:wrap}
.site-nav a{color:#e8e2f5;text-decoration:none;font-size:.95rem}
.site-nav a:hover{text-decoration:underline}
.hero{padding:56px 0 36px;text-align:center}
.hero h1{font-size:2.6rem;margin:0 0 8px;line-height:1.2}
.hero .tagline{font-size:1.25rem;color:var(--accent);font-weight:700;margin:0 0 16px}
.hero .concept{max-width:640px;margin:0 auto;color:var(--muted)}
.progress-summary{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:20px 24px;margin:8px 0 40px}
.progress-summary h2{margin:0 0 8px;font-size:1.1rem}
.progress-count{font-size:1.4rem;font-weight:800}
.progress-bar{height:14px;background:#f0e6da;border-radius:999px;overflow:hidden;margin:10px 0 14px}
.progress-bar-fill{height:100%;background:var(--accent);width:0;transition:width .4s ease}
.btn{display:inline-block;border:1px solid var(--line);background:#fff;color:var(--ink);
  border-radius:999px;padding:8px 18px;cursor:pointer;font-size:.95rem;text-decoration:none}
.btn:hover{border-color:var(--accent);color:var(--accent)}
.btn-primary{background:var(--accent);border-color:var(--accent);color:#fff;font-weight:700}
.btn-primary:hover{color:#fff;opacity:.9}
.series-group{margin:0 0 36px}
.series-group h2{font-size:1.35rem;margin:0 0 4px}
.series-group h2 .series-ja{color:var(--muted);font-size:1rem;font-weight:400;margin-left:8px}
.line-cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px;margin-top:14px}
.line-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px;display:flex;flex-direction:column;gap:6px}
.line-card .card-ja{font-size:1.3rem;font-weight:800;line-height:1.5}
.line-card .card-romaji{color:var(--muted);font-style:italic}
.line-card .card-en{font-weight:600}
.line-card .card-char{color:var(--muted);font-size:.9rem}
.line-card .card-link{margin-top:auto;padding-top:8px;font-weight:700}
.progress-badge{display:inline-block;font-size:.8rem;font-weight:700;border-radius:999px;
  padding:2px 10px;background:#f0e6da;color:var(--muted);align-self:flex-start}
.progress-badge.is-done{background:#dff3e6;color:var(--ok)}
main{padding-bottom:56px}
.line-hero{padding:40px 0 8px;text-align:center}
.line-hero .series-name{color:var(--muted)}
.line-hero .big-ja{font-size:2.4rem;font-weight:800;line-height:1.4;margin:12px 0 6px}
.line-hero .big-romaji{font-size:1.15rem;color:var(--muted);font-style:italic;margin:0}
.line-hero .big-en{font-size:1.35rem;font-weight:700;margin:8px 0}
.line-hero .char-name{color:var(--muted)}
section.block{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px 26px;margin:22px 0}
section.block h2{margin-top:0;font-size:1.3rem}
table.words{width:100%;border-collapse:collapse}
table.words th,table.words td{border-bottom:1px solid var(--line);padding:8px 10px;text-align:left;vertical-align:top}
table.words th{color:var(--muted);font-size:.85rem;text-transform:uppercase;letter-spacing:.05em}
table.words .w-jp{font-weight:800;font-size:1.1rem;white-space:nowrap}
table.words .w-romaji{color:var(--muted);font-style:italic;white-space:nowrap}
.grammar-item h3{margin:18px 0 4px;font-size:1.05rem}
.grammar-item p{margin:0}
.quiz-q{border-top:1px solid var(--line);padding:18px 0}
.quiz-q:first-of-type{border-top:none}
.quiz-q .q-text{font-weight:700;font-size:1.05rem}
.quiz-options{display:flex;flex-direction:column;gap:8px;margin:12px 0}
.quiz-option{text-align:left;border:2px solid var(--line);background:#fff;border-radius:10px;
  padding:10px 14px;font-size:1rem;cursor:pointer;color:var(--ink)}
.quiz-option:hover{border-color:var(--accent2)}
.quiz-option.is-correct{border-color:var(--ok);background:#dff3e6}
.quiz-option.is-wrong{border-color:var(--ng);background:#fbe4e2}
.quiz-option:disabled{cursor:default;opacity:.85}
.quiz-feedback{font-weight:700;min-height:1.4em;margin:6px 0}
.quiz-feedback.ok{color:var(--ok)}
.quiz-feedback.ng{color:var(--ng)}
.quiz-explain{background:#f6f1e8;border-radius:10px;padding:10px 14px;margin:8px 0}
.speak-btn{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line);
  background:#fff;color:var(--ink);border-radius:999px;padding:6px 14px;cursor:pointer;font-size:.92rem}
.speak-btn:hover{border-color:var(--accent);color:var(--accent)}
.speak-btn.is-playing{background:var(--accent);border-color:var(--accent);color:#fff}
.speak-main{margin-top:14px;font-size:1rem;padding:8px 20px}
.speak-word{padding:2px 9px;font-size:.85rem;margin-left:8px}
.speech-note{color:var(--muted);font-size:.88rem;margin:8px 0 0}
.line-progress-note{font-weight:700}
.shop-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:14px;margin:14px 0}
.shop-slot{border:2px dashed var(--line);border-radius:var(--radius);padding:18px;text-align:center;color:var(--muted)}
.shop-slot h3{margin:0 0 6px;color:var(--ink)}
.shop-slot p{margin:0;font-size:.92rem}
.ad-disclosure{font-size:.85rem;color:var(--muted)}
.pager{display:flex;justify-content:space-between;gap:12px;margin:30px 0 0;flex-wrap:wrap}
.site-footer{background:#23202b;color:#cfc9dd;margin-top:40px}
.site-footer .wrap{padding:26px 20px;display:flex;gap:20px;flex-wrap:wrap;justify-content:space-between}
.site-footer a{color:#e8e2f5}
.prose h1{font-size:2rem}
.prose h2{margin-top:32px}
.request-form .form-field{margin:0 0 18px}
.request-form label{display:block;font-weight:700;margin:0 0 6px}
.request-form .req-mark{color:var(--accent);font-size:.85rem;font-weight:700;margin-left:6px}
.request-form .opt-mark{color:var(--muted);font-size:.85rem;font-weight:400;margin-left:6px}
.request-form input[type="text"],.request-form textarea{width:100%;border:1px solid var(--line);
  border-radius:10px;padding:10px 12px;font-size:1rem;font-family:inherit;background:#fff;color:var(--ink)}
.request-form input[type="text"]:focus,.request-form textarea:focus{outline:none;border-color:var(--accent2)}
.request-cta{text-align:center}
.request-cta p{color:var(--muted);margin:0 0 12px}
@media (max-width:600px){
  .hero h1{font-size:2rem}
  .line-hero .big-ja{font-size:1.8rem}
  section.block{padding:18px}
  table.words .w-jp,table.words .w-romaji{white-space:normal}
}