:root{--color-primary:#1e40af;--color-primary-light:#3b82f6;--color-success:#16a34a;--color-danger:#dc2626;--color-warning:#d97706;--color-gray:#6b7280;--color-bg:#f8fafc;--color-card:#ffffff;--radius:8px}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Hiragino Sans,Noto Sans JP,sans-serif;background:var(--color-bg);color:#1f2937;line-height:1.6}.container{max-width:900px;margin:0 auto;padding:16px}.card{background:var(--color-card);border-radius:var(--radius);box-shadow:0 1px 4px rgba(0,0,0,.08);padding:24px;margin-bottom:16px}.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 20px;border:none;border-radius:var(--radius);font-size:1rem;font-weight:600;cursor:pointer;transition:opacity .2s}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--color-primary);color:#fff}.btn-primary:hover:not(:disabled){background:var(--color-primary-light)}.btn-secondary{background:var(--color-gray);color:#fff}.form-group{margin-bottom:16px}.form-label{display:block;font-weight:600;margin-bottom:6px}.form-input{width:100%;padding:8px 12px;border:1px solid #d1d5db;border-radius:var(--radius);font-size:1rem}.form-input:focus{outline:2px solid var(--color-primary-light);outline-offset:1px}.error-text{color:var(--color-danger);font-size:.85rem;margin-top:4px}.section-title{font-size:1.2rem;font-weight:700;margin-bottom:16px;padding-bottom:8px;border-bottom:2px solid var(--color-primary-light)}@media (max-width:600px){.container{padding:8px}.card{padding:16px}}