:root{--bg:#eef1f5;--ink:#1d2433;--muted:#5d6677;--accent:#2f5bea;--glass:hsla(0,0%,100%,.62);--line:rgba(29,36,51,.08);--shadow:8px 8px 24px rgba(163,177,198,.45),-8px -8px 24px hsla(0,0%,100%,.9);--radius:18px}*{box-sizing:border-box}body{margin:0;min-height:100vh;font:15px/1.5 ui-sans-serif,system-ui,-apple-system,Segoe UI,sans-serif;color:var(--ink);background:radial-gradient(1200px 600px at 10% -10%,#dfe7ff 0,transparent 60%),var(--bg)}a{color:inherit}.shell{display:grid;grid-template-columns:220px 1fr;min-height:100vh}.nav{padding:28px 18px;display:flex;flex-direction:column;gap:6px}.brand{font-weight:650;letter-spacing:.2px;margin:0 10px 22px}.nav a{text-decoration:none;padding:10px 12px;border-radius:12px;color:var(--muted)}.nav a[aria-current=page]{background:var(--glass);color:var(--ink);box-shadow:var(--shadow)}.main{padding:36px 44px;max-width:880px}.card{background:var(--glass);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px;margin-bottom:18px}h1{font-size:24px;margin:0 0 18px;font-weight:650}h2{font-size:16px;margin:0 0 10px}.muted{color:var(--muted)}.row{display:flex;gap:12px;align-items:center;flex-wrap:wrap}.ghost,.primary{border:0;border-radius:12px;padding:11px 18px;font:inherit;cursor:pointer;text-decoration:none;display:inline-flex;gap:8px;align-items:center}.primary{background:var(--accent);color:#fff;box-shadow:0 6px 18px rgba(47,91,234,.3)}.ghost{background:transparent;color:var(--muted)}.icon{background:var(--glass);border:1px solid var(--line);border-radius:10px;width:36px;height:36px;display:inline-grid;place-items:center;cursor:pointer}input[type=email],input[type=text]{font:inherit;padding:11px 14px;border-radius:12px;border:1px solid var(--line);background:#fff;min-width:240px}pre{background:#1d2433;color:#e8ecf5;padding:14px 16px;border-radius:12px;overflow-x:auto;margin:0;font-size:13px}.list{list-style:none;padding:0;margin:0}.list li{padding:12px 0;border-bottom:1px solid var(--line);display:flex;justify-content:space-between}.error{color:#b42318}.ok{color:#1d7a4f}.center{min-height:100vh;display:grid;place-items:center}.switch{display:inline-flex;gap:4px;background:var(--glass);border-radius:12px;padding:4px;border:1px solid var(--line)}.switch button{border:0;background:transparent;padding:7px 12px;border-radius:9px;cursor:pointer;font:inherit;color:var(--muted)}.switch button[aria-pressed=true]{background:#fff;color:var(--ink);box-shadow:0 2px 8px rgba(0,0,0,.06)}