:root{--bg: #0f1115;--panel: #171a21;--line: #262b36;--text: #e8ebf0;--muted: #8b93a5;--accent: #4f8cff;color-scheme:dark}*{box-sizing:border-box}html,body,#app{height:100%;margin:0}body{background:var(--bg);color:var(--text);font:14px/1.6 -apple-system,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif}.page{min-height:100%;display:flex;flex-direction:column}.topbar{display:flex;align-items:center;justify-content:space-between;padding:14px 24px;border-bottom:1px solid var(--line)}.brand{font-weight:650;letter-spacing:.5px}.brand small{color:var(--muted);font-weight:400;margin-left:8px}.main{flex:1;padding:32px 24px;max-width:960px;width:100%;margin:0 auto}.card{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:20px}.center{min-height:100%;display:grid;place-items:center;padding:24px}.btn{display:inline-flex;align-items:center;gap:8px;background:var(--accent);color:#fff;border:0;border-radius:8px;padding:10px 16px;font-size:14px;cursor:pointer}.btn:disabled{opacity:.6;cursor:default}.btn.ghost{background:transparent;border:1px solid var(--line);color:var(--text)}.hint{color:var(--muted)}.err{color:#ff7b72;margin-top:12px}dl.kv{display:grid;grid-template-columns:120px 1fr;gap:8px 16px;margin:16px 0 0}dl.kv dt{color:var(--muted)}dl.kv dd{margin:0;word-break:break-all}