:root{color-scheme:light;--bg:#f5f5f5;--card:#fff;--fg:#101010;--muted:#666;--line:#d7d7d7;--button:#111;--button-fg:#fff;--focus:#4c7dff;--error:#b00020}
:root[data-theme="dark"]{color-scheme:dark;--bg:#000;--card:#000;--fg:#f5f5f5;--muted:#9b9b9b;--line:#2b2b2b;--button:#f4f4f4;--button-fg:#000;--focus:#9eb8ff;--error:#ff7b8b}
*{box-sizing:border-box}html,body{margin:0;min-height:100%;background:var(--bg);color:var(--fg);font-family:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei",sans-serif}
body{min-height:100vh;display:grid;place-items:center;padding:24px}.card{width:min(760px,100%);background:var(--card);border:1px solid var(--line);border-radius:18px;padding:26px;box-shadow:0 14px 45px rgba(0,0,0,.08)}
:root[data-theme="dark"] .card{box-shadow:none}.controlbar{display:flex;justify-content:center;align-items:center;gap:10px;margin-bottom:22px;flex-wrap:wrap}
label{display:block;font-weight:650;margin:0 0 9px}.row{display:flex;gap:10px}input{min-width:0;flex:1;height:46px;border-radius:11px;border:1px solid var(--line);background:var(--card);color:var(--fg);padding:0 13px;font-size:15px;outline:none}input:focus{border-color:var(--focus);box-shadow:0 0 0 3px color-mix(in srgb,var(--focus) 20%,transparent)}
button{height:46px;border:0;border-radius:11px;padding:0 18px;background:var(--button);color:var(--button-fg);font-weight:700;cursor:pointer}button:disabled{opacity:.5;cursor:not-allowed}#theme{width:46px;padding:0;border:1px solid var(--line)}.toggle{border:1px solid var(--line);min-width:128px}.toggle:not(.on){background:var(--card);color:var(--fg)}
.result{margin-top:24px;padding-top:23px;border-top:1px solid var(--line)}.hidden{display:none}.status{min-height:21px;margin:14px 0 0;color:var(--muted);font-size:14px}.status.error{color:var(--error)}#copy.copied{outline:3px solid var(--focus);outline-offset:2px;transform:scale(.97)}.version{text-align:center;color:var(--muted);font-size:12px;margin-top:18px;letter-spacing:.03em;user-select:none}
@media(max-width:600px){body{padding:14px}.card{padding:20px;border-radius:14px}.row{flex-direction:column}.row button{width:100%}}