:root{--brand: #0f766e;--brand-contrast: #ffffff;font-family:Hiragino Kaku Gothic ProN,Noto Sans JP,system-ui,sans-serif;color:#1f2937}body{margin:0;background:#fafaf9}.container{max-width:560px;margin:3rem auto;padding:0 1rem}.hero{background:var(--brand);color:var(--brand-contrast);border-radius:12px;padding:2rem 1.5rem;margin-bottom:1rem}.hero h1{margin:0 0 .25rem;font-size:1.4rem}.card{background:#fff;border-radius:12px;padding:1.5rem;box-shadow:0 1px 3px #00000014;margin-bottom:1rem}form{display:grid;gap:.75rem}input{padding:.5rem .75rem;border:1px solid #d1d5db;border-radius:8px;font-size:.9rem}button{padding:.5rem .75rem;border:none;border-radius:8px;background:var(--brand);color:var(--brand-contrast);font-size:.9rem;cursor:pointer}pre{background:#f9fafb;border:1px solid #e5e7eb;border-radius:8px;padding:.75rem;font-size:.8rem;overflow-x:auto}.error{color:#b91c1c;font-size:.85rem}