:root{--bg: #f4f6fb;--surface: #ffffff;--ink: #10151f;--muted: #5b6472;--line: #e2e6ee;--accent: #1a5cff;--danger: #b3261e;--danger-bg: #fdecea}@media(prefers-color-scheme:dark){:root{--bg: #0d1117;--surface: #161b24;--ink: #eef1f6;--muted: #9aa4b2;--line: #262d3a;--accent: #6c9bff;--danger: #ff9d94;--danger-bg: #3a1e1c}}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.55 -apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif}.shell{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;padding:24px}.card{width:100%;max-width:420px;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:28px;box-shadow:0 12px 32px #10151f14}.brand{display:flex;align-items:center;gap:10px;padding-bottom:18px;border-bottom:1px solid var(--line);margin-bottom:22px}.brand__mark{background:var(--accent);color:#fff;font-weight:700;font-size:13px;letter-spacing:.08em;padding:4px 8px;border-radius:6px}.brand__label{color:var(--muted);font-size:13px;text-transform:uppercase;letter-spacing:.1em}.panel{text-align:center}.panel__title{font-size:19px;margin:0 0 8px}.panel__body{color:var(--muted);margin:0 0 20px}.panel__note{color:var(--muted);font-size:12.5px;text-align:left;margin:18px 0 0}.button{width:100%;padding:11px 16px;border:1px solid var(--line);border-radius:9px;background:var(--accent);color:#fff;font:inherit;font-weight:600;cursor:pointer}.button:hover{filter:brightness(1.06)}.alert{background:var(--danger-bg);color:var(--danger);border-radius:9px;padding:10px 12px;margin:0 0 18px;font-size:13.5px;text-align:left}.detail{display:grid;grid-template-columns:auto 1fr;gap:6px 14px;margin:18px 0 0;text-align:left;font-size:13px}.detail dt{color:var(--muted)}.detail dd{margin:0;overflow-wrap:anywhere}code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:12.5px}.spinner{display:block;width:26px;height:26px;margin:0 auto 16px;border:3px solid var(--line);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}@media(prefers-reduced-motion:reduce){.spinner{animation-duration:2.4s}}.footnote{max-width:420px;color:var(--muted);font-size:12.5px;text-align:center;margin:0}