:root{--bg: #f8fafc;--card: #ffffff;--text: #0f172a;--muted: #64748b;--accent: #2563eb;--border: #e2e8f0}*{box-sizing:border-box}body{margin:0;font-family:Segoe UI,Hiragino Sans,Meiryo,sans-serif;background:var(--bg);color:var(--text);line-height:1.5}a{color:var(--accent)}.profile-app{max-width:720px;margin:0 auto;padding:1.5rem 1rem 3rem}.profile-header{display:flex;gap:1.25rem;align-items:flex-start;background:var(--card);border:1px solid var(--border);border-radius:12px;padding:1.25rem;margin-bottom:1rem}.profile-avatar{width:96px;height:96px;border-radius:50%;object-fit:cover;background:#e2e8f0;flex-shrink:0}.profile-avatar-placeholder{display:flex;align-items:center;justify-content:center;font-size:2rem;color:var(--muted)}.profile-name{margin:0 0 .25rem;font-size:1.5rem}.profile-id{color:var(--muted);font-size:.85rem;font-family:monospace}.profile-bio{margin:.5rem 0 0;color:var(--text)}.profile-section{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:1rem 1.25rem;margin-bottom:1rem}.profile-section h2{margin:0 0 .75rem;font-size:1rem;color:var(--muted);font-weight:600}.profile-stats dt{font-weight:600;margin-top:.5rem}.profile-stats dd{margin:.15rem 0 0;color:var(--muted)}.profile-empty{color:var(--muted);font-size:.9rem}.profile-actions{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:1rem}.btn{display:inline-block;padding:.5rem 1rem;border-radius:8px;border:1px solid var(--border);background:var(--card);color:var(--text);text-decoration:none;font-size:.9rem;cursor:pointer}.btn-primary{background:var(--accent);border-color:var(--accent);color:#fff}.btn:disabled{opacity:.6;cursor:not-allowed}.profile-form label{display:block;margin-bottom:.75rem;font-size:.9rem}.profile-form input[type=text],.profile-form textarea{width:100%;margin-top:.25rem;padding:.5rem .75rem;border:1px solid var(--border);border-radius:8px;font:inherit}.profile-form textarea{resize:vertical;min-height:3rem}.profile-error{color:#b91c1c;font-size:.9rem}.profile-notice{font-size:.8rem;color:var(--muted);margin-top:1rem}.title-badge{height:28px;vertical-align:middle;margin-left:.5rem}.profile-top-nav{margin-bottom:1rem}.profile-top-nav a{margin-right:1rem}