:root{--sa-navy:#0f172a;--sa-blue:#2563eb;--sa-teal:#14b8a6;--sa-gray:#64748b;--sa-bg:#f8fafc;--sa-border:#e2e8f0}*{box-sizing:border-box}body{background:var(--sa-bg);color:var(--sa-navy);margin:0;font-family:-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif}#root{min-height:100vh}.sa-nav{border-bottom:1px solid var(--sa-border);background:#fff;justify-content:space-between;align-items:center;padding:16px 32px;display:flex}.sa-brand{color:var(--sa-navy);font-size:20px;font-weight:800;text-decoration:none}.sa-brand span{color:var(--sa-blue)}.sa-nav a.sa-link{color:var(--sa-gray);margin-left:20px;font-size:14px;font-weight:600;text-decoration:none}.sa-nav a.sa-link:hover{color:var(--sa-blue)}.sa-container{text-align:left;max-width:720px;margin:0 auto;padding:48px 24px}.sa-hero{text-align:center;padding:80px 24px 60px}.sa-hero h1{margin-bottom:8px;font-size:40px}.sa-hero p{color:var(--sa-gray);max-width:520px;margin:0 auto 32px;font-size:18px}.sa-btn{background:linear-gradient(90deg, var(--sa-blue), var(--sa-teal));color:#fff;cursor:pointer;border:none;border-radius:8px;padding:12px 28px;font-size:15px;font-weight:700;text-decoration:none;display:inline-block}.sa-btn[disabled],.sa-btn.sa-btn-disabled{background:var(--sa-gray);cursor:not-allowed;opacity:.7}.sa-card{border:1px solid var(--sa-border);text-align:left;background:#fff;border-radius:12px;margin-top:24px;padding:32px}.sa-field{margin-bottom:16px}.sa-field label{margin-bottom:6px;font-size:14px;font-weight:600;display:block}.sa-field input{border:1px solid var(--sa-border);border-radius:6px;width:100%;padding:10px 12px;font-size:14px}.sa-error{color:#dc2626;background:#fef2f2;border-radius:6px;margin-bottom:16px;padding:10px 14px;font-size:14px}.sa-success{color:#16a34a;background:#f0fdf4;border-radius:6px;margin-bottom:16px;padding:10px 14px;font-size:14px}.sa-note{color:var(--sa-gray);margin-top:8px;font-size:13px}.sa-token-box{background:var(--sa-navy);color:#86efac;word-break:break-all;border-radius:8px;padding:14px;font-family:Consolas,monospace;font-size:13px}.sa-grid{grid-template-columns:1fr 1fr;gap:16px;margin-top:16px;display:grid}@media (width<=600px){.sa-grid{grid-template-columns:1fr}}