:root{--bg:#070816;--card:rgba(255,255,255,.075);--card2:rgba(255,255,255,.11);--stroke:rgba(255,255,255,.13);--text:#f8fafc;--muted:#aab2ca;--pink:#ff4fa3;--violet:#7c5cff;--cyan:#1ee7ff;--green:#36f08a;--red:#ff4d64;--yellow:#ffd166;--shadow:0 20px 70px rgba(0,0,0,.35);--r:26px}*{box-sizing:border-box}html,body{margin:0;min-height:100%;font-family:'Plus Jakarta Sans',system-ui,-apple-system,sans-serif;background:radial-gradient(circle at 12% 10%,rgba(124,92,255,.38),transparent 32%),radial-gradient(circle at 85% 0%,rgba(255,79,163,.28),transparent 30%),radial-gradient(circle at 50% 100%,rgba(30,231,255,.18),transparent 34%),var(--bg);color:var(--text);overflow-x:hidden}.jpfont{font-family:'Noto Serif JP',serif}.bg-kanji{position:fixed;right:-40px;top:90px;font-size:34vw;font-family:'Noto Serif JP',serif;font-weight:800;color:rgba(255,255,255,.035);pointer-events:none;z-index:0}.app{position:relative;z-index:1;max-width:1120px;margin:auto;padding:18px 14px 80px}.top{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:18px}.brand{display:flex;align-items:center;gap:10px;font-weight:900;letter-spacing:-.04em}.logo{width:42px;height:42px;border-radius:15px;background:linear-gradient(135deg,var(--pink),var(--violet),var(--cyan));display:grid;place-items:center;box-shadow:0 14px 30px rgba(124,92,255,.38)}.muted{color:var(--muted)}.pill{border:1px solid var(--stroke);background:rgba(255,255,255,.08);backdrop-filter:blur(16px);color:var(--text);border-radius:999px;padding:10px 13px;font-weight:800;font-size:.82rem}.btn{border:0;border-radius:18px;padding:14px 18px;font-weight:900;color:white;background:linear-gradient(135deg,var(--pink),var(--violet));box-shadow:0 12px 28px rgba(124,92,255,.36);cursor:pointer;transition:.18s transform,.18s filter;font-family:inherit}.btn:active{transform:scale(.97)}.btn.secondary{background:rgba(255,255,255,.09);border:1px solid 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span{display:block;background:linear-gradient(90deg,#fff,#c9d4ff,#ffb5db);-webkit-background-clip:text;color:transparent}.hero-sub{max-width:620px;font-size:1.03rem;line-height:1.7;color:#cdd3eb}.login-card{padding:22px;display:flex;flex-direction:column;gap:14px}.login-preview{min-height:220px;border-radius:24px;background:radial-gradient(circle at 60% 20%,rgba(30,231,255,.16),transparent 35%),rgba(255,255,255,.055);border:1px solid var(--stroke);display:grid;place-items:center;text-align:center;padding:20px}.bigjp{font-family:'Noto Serif JP',serif;font-size:5rem;line-height:1;color:#fff;text-shadow:0 0 38px rgba(255,79,163,.38)}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:14px}.level-card,.mode-card,.bab-card{padding:18px;border-radius:24px;border:1px solid var(--stroke);background:rgba(255,255,255,.07);cursor:pointer;transition:.18s;position:relative;overflow:hidden}.level-card:hover,.mode-card:hover,.bab-card:hover{transform:translateY(-2px);background:rgba(255,255,255,.105)}.level-title{font-size:2rem;font-weight:1000;letter-spacing:-.05em}.bar{height:10px;background:rgba(255,255,255,.1);border-radius:99px;overflow:hidden;margin-top:14px}.bar span{display:block;height:100%;background:linear-gradient(90deg,var(--green),var(--cyan),var(--violet));border-radius:99px}.section-title{display:flex;align-items:center;justify-content:space-between;margin:24px 0 12px}.section-title h2{margin:0;font-size:1.3rem}.bab-card.locked{opacity:.45;filter:grayscale(.5);cursor:not-allowed}.bab-num{font-size:1.4rem;font-weight:1000}.mode-emoji{font-size:2rem}.mode-card.done{border-color:rgba(54,240,138,.45)}.screen{display:none}.screen.active{display:block}.quiz-wrap{max-width:760px;margin:0 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