*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,'Hiragino Kaku Gothic ProN','Noto Sans JP',sans-serif;background:#f6f7f9;color:#1f2937;line-height:1.6}
a{color:#4f46e5;text-decoration:none}
.nav{background:#fff;border-bottom:1px solid #eceef1;padding:14px 22px;display:flex;align-items:center;justify-content:space-between}
.nav .logo{font-weight:800;font-size:17px;color:#111827}
.nav .logo span{color:#4f46e5}
.wrap{max-width:960px;margin:0 auto;padding:28px 20px}
.card{background:#fff;border:1px solid #eceef1;border-radius:14px;padding:22px;margin-bottom:18px}
.hero{text-align:center;padding:56px 20px 26px}
.hero h1{font-size:30px;line-height:1.4;margin:0 0 14px;color:#0f172a}
.hero p{font-size:15px;color:#6b7280;max-width:560px;margin:0 auto 24px}
.btn{display:inline-block;background:#4f46e5;color:#fff;font-weight:600;font-size:14px;padding:12px 22px;border-radius:10px;border:none;cursor:pointer}
.btn:hover{background:#4338ca}
.btn.ghost{background:#fff;color:#4f46e5;border:1px solid #d9dce1}
.btn.ghost:hover{background:#f5f5ff}
.btn.block{display:block;width:100%;text-align:center}
label{display:block;font-size:13px;font-weight:600;color:#374151;margin:14px 0 6px}
input[type=text],input[type=email],input[type=password]{width:100%;padding:11px 13px;border:1px solid #d9dce1;border-radius:9px;font-size:14px;outline:none}
input:focus{border-color:#4f46e5}
.muted{color:#6b7280;font-size:13px}
.row3{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:16px;margin-top:20px}
.feat{background:#fff;border:1px solid #eceef1;border-radius:12px;padding:18px}
.feat .ic{font-size:22px}
.feat h3{font-size:14px;margin:8px 0 4px}
.feat p{font-size:12.5px;color:#6b7280;margin:0}
.badge{display:inline-block;background:#eef2ff;color:#4f46e5;font-size:12px;font-weight:600;padding:3px 10px;border-radius:999px}
.code{background:#0f172a;color:#e2e8f0;border-radius:10px;padding:14px;font-family:ui-monospace,Menlo,monospace;font-size:12.5px;white-space:pre-wrap;word-break:break-all}
.err{background:#fef2f2;color:#b91c1c;border:1px solid #fecaca;padding:10px 12px;border-radius:8px;font-size:13px;margin-top:12px;display:none}
.ok{background:#ecfdf5;color:#047857;border:1px solid #a7f3d0;padding:8px 12px;border-radius:8px;font-size:13px;margin-top:10px;display:none}