:root{--bg:#f4f4f5;--text:#18181b;--hint:#71717a;--link:#2563eb;--btn:#2563eb;--btn-text:#fff;--card:#fff;--border:#e4e4e7;--danger:#dc2626;--success:#16a34a}*{box-sizing:border-box}html,body{margin:0;padding:0}body{background:var(--bg);color:var(--text);font-family:Vazirmatn,Tahoma,Segoe UI,system-ui,sans-serif;font-size:15px;line-height:1.7}.container{max-width:480px;margin:0 auto;padding:16px}.card{background:var(--card);border:1px solid var(--border);border-radius:14px;margin-bottom:12px;padding:16px}.balance{margin:4px 0 2px;font-size:28px;font-weight:700}.hint{color:var(--hint);font-size:13px}.btn{background:var(--btn);width:100%;color:var(--btn-text);cursor:pointer;border:none;border-radius:12px;justify-content:center;align-items:center;gap:6px;margin-top:8px;padding:12px 16px;font-size:15px;font-weight:600;text-decoration:none;display:inline-flex}.btn.secondary{color:var(--link);border:1px solid var(--border);background:0 0}.btn:disabled{opacity:.6;cursor:default}.input{border:1px solid var(--border);background:var(--bg);width:100%;color:var(--text);border-radius:12px;padding:12px 14px;font-family:inherit;font-size:16px}.row{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding:10px 0;display:flex}.row:last-child{border-bottom:none}.mono{direction:ltr;unicode-bidi:embed;font-family:ui-monospace,SFMono-Regular,Menlo,monospace}.error{color:var(--danger);margin-top:8px;font-size:13px}.success{color:var(--success)}label{color:var(--hint);margin:12px 0 4px;font-size:13px;display:block}