:root{--navy:#16245D;--blue:#3F6BFF;--soft:#EAF2FF;--bg:#F7F9FC;--card:#fff;--text:#1A1F36;--muted:#667085;--line:#E6ECF5;--green:#22C55E;--orange:#F59E0B;--purple:#7C3AED}*{box-sizing:border-box}body.grammar-page{margin:0;background:linear-gradient(180deg,#f8fbff,#fff);font-family:Inter,system-ui,-apple-system,Segoe UI,sans-serif;color:var(--text)}.gm-header{height:72px;display:flex;align-items:center;justify-content:space-between;padding:0 28px;background:rgba(255,255,255,.9);backdrop-filter:blur(12px);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}.gm-brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--navy)}.gm-brand img{width:44px;height:44px;object-fit:contain}.gm-brand b{display:block;font-size:18px}.gm-brand small{display:block;color:var(--muted);font-size:12px}.gm-nav{display:flex;gap:10px}.gm-nav a{text-decoration:none;color:var(--muted);padding:10px 14px;border-radius:999px;font-weight:800;font-size:14px}.gm-nav a.active,.gm-nav a:hover{background:#fff2e6;color:#9a3412}.gm-wrap{max-width:1320px;margin:0 auto;padding:24px}.gm-hero{display:grid;grid-template-columns:1fr 360px;gap:24px;align-items:stretch;background:linear-gradient(135deg,#fff7ed,#eef5ff 72%,#fff);border:1px solid var(--line);border-radius:34px;padding:34px;box-shadow:0 18px 50px rgba(22,36,93,.10);overflow:hidden}.gm-pill{display:inline-flex;background:#fff;border:1px solid #fed7aa;color:#c2410c;padding:8px 13px;border-radius:999px;font-weight:900}.gm-copy h1{margin:14px 0 8px;font-size:46px;line-height:1.04;color:var(--navy);letter-spacing:-1px}.gm-copy p{color:var(--muted);font-size:17px;max-width:680px}.gm-hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px}.gm-btn{display:inline-flex;align-items:center;justify-content:center;text-decoration:none;border-radius:16px;padding:13px 18px;font-weight:900}.gm-btn.primary{background:linear-gradient(135deg,#f97316,#fb923c);color:#fff;box-shadow:0 12px 28px rgba(249,115,22,.25)}.gm-btn.white{background:#fff;color:var(--navy);border:1px solid var(--line)}.gm-card-formula{background:#fff;border:1px solid #fed7aa;border-radius:28px;padding:24px;box-shadow:0 12px 28px rgba(249,115,22,.10)}.gm-card-formula small{display:block;color:var(--muted);font-weight:800}.gm-card-formula b{display:block;color:var(--navy);font-size:38px;margin:10px 0}.gm-card-formula p{color:var(--muted)}.gm-card-formula em{display:block;background:#fff7ed;border-radius:18px;padding:14px;color:#9a3412;font-style:normal;font-weight:900}.gm-dashboard{display:grid;grid-template-columns:280px 1fr;gap:22px;margin-top:22px}.gm-left{display:flex;flex-direction:column;gap:14px}.gm-level-card,.gm-plan,.gm-main{background:#fff;border:1px solid var(--line);border-radius:28px;padding:18px;box-shadow:0 8px 24px rgba(22,36,93,.06)}.gm-level-card>b{display:block;font-size:44px;color:var(--navy)}.gm-level-card>span{color:var(--muted)}.gm-levels{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:16px}.gm-levels a{text-align:center;text-decoration:none;color:var(--navy);background:#f8fbff;border:1px solid var(--line);border-radius:16px;padding:11px;font-weight:900}.gm-levels a.active{background:#f97316;color:#fff;border-color:#f97316}.gm-plan h3{margin:0 0 10px;color:var(--navy)}.gm-plan ol{margin:0;padding-left:20px;color:var(--muted);line-height:1.9}.gm-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.gm-stats article{border:1px solid var(--line);border-radius:22px;padding:18px;background:#fff}.gm-stats b{display:block;color:var(--navy);font-size:26px}.gm-stats span{color:var(--muted);font-size:13px}.gm-filters{display:flex;gap:8px;flex-wrap:wrap;margin:18px 0}.gm-filters button{border:1px solid var(--line);background:#fff;color:var(--muted);border-radius:999px;padding:10px 14px;font-weight:900;cursor:pointer}.gm-filters button.active{background:var(--navy);color:#fff}.gm-filters input{margin-left:auto;min-width:280px;border:1px solid var(--line);border-radius:16px;padding:12px 14px}.gm-section-title h2{margin:12px 0 4px;color:var(--navy)}.gm-section-title p{margin:0 0 12px;color:var(--muted)}.gm-groups{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.gm-group{background:linear-gradient(180deg,#fff,#fffaf5);border:1px solid var(--line);border-radius:24px;padding:18px;text-decoration:none;color:var(--text);transition:.18s}.gm-group:hover{transform:translateY(-4px);box-shadow:0 16px 36px rgba(22,36,93,.12)}.gm-group i{display:inline-flex;width:44px;height:44px;align-items:center;justify-content:center;border-radius:16px;background:#fff7ed;font-style:normal}.gm-group b{display:block;margin-top:12px;color:var(--navy);font-size:18px}.gm-group span{display:block;color:var(--muted);font-size:13px;margin-top:4px}.gm-patterns{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.gm-pattern{background:#fff;border:1px solid var(--line);border-radius:24px;padding:18px;text-decoration:none;color:var(--text);display:grid;grid-template-columns:1fr auto;gap:12px}.gm-pattern h3{margin:0;color:var(--navy);font-size:24px}.gm-pattern p{margin:8px 0;color:var(--muted)}.gm-pattern code{display:inline-flex;background:#f8fbff;border:1px solid var(--line);border-radius:12px;padding:8px 10px;color:#0f172a;font-family:'Noto Sans JP',system-ui,sans-serif}.gm-tag{height:max-content;border-radius:999px;padding:7px 10px;font-size:12px;font-weight:900;background:#ecfdf3;color:#15803d}.gm-tag.vip{background:#fff7ed;color:#c2410c}@media(max-width:980px){.gm-wrap{padding:14px}.gm-header{padding:0 14px}.gm-nav{display:none}.gm-hero,.gm-dashboard{grid-template-columns:1fr}.gm-stats,.gm-groups,.gm-patterns{grid-template-columns:1fr}.gm-filters input{width:100%;margin-left:0}.gm-copy h1{font-size:36px}}