:root{--bg:#ffffff;--fg:#1a1a1a;--muted:#666;--border:#e0e0e0;--primary:#2563eb;--primary-hover:#1d4ed8;--danger:#dc2626}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--bg);color:var(--fg);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Hiragino Sans,Noto Sans JP,sans-serif;line-height:1.6}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}.container{max-width:480px;margin:0 auto;padding:2rem 1rem}.form{gap:1rem}.form,.form label{display:flex;flex-direction:column}.form label{gap:.25rem;font-size:.875rem}.form input{padding:.5rem .75rem;border:1px solid var(--border);border-radius:6px;font-size:1rem}.form input:focus{outline:none;border-color:var(--primary)}.btn{padding:.625rem 1rem;background:var(--primary);color:white;border:none;border-radius:6px;font-size:1rem;cursor:pointer}.btn:hover{background:var(--primary-hover)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-secondary{background:transparent;color:var(--primary);border:1px solid var(--primary)}.error{color:var(--danger)}.error,.muted{font-size:.875rem}.muted{color:var(--muted)}