:root{
  --paper:#faf7f0; --card:#fffdf8; --ink:#2b2620; --muted:#8a7f6d;
  --red:#b03a2e; --red-soft:#f6e3df; --line:#e6ddcd; --gold:#c8963e;
  --done:#3e7d4e;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{background:var(--paper);color:var(--ink);font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;min-height:100vh;display:flex;flex-direction:column}
a{color:var(--red)}
button{font-family:inherit;cursor:pointer}

.topbar{display:flex;justify-content:space-between;align-items:center;gap:16px;padding:18px 28px;border-bottom:1px solid var(--line);flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:14px}
.seal{display:inline-flex;align-items:center;justify-content:center;width:48px;height:48px;background:var(--red);color:#fff;font-family:"Noto Serif SC","Songti SC",serif;font-size:26px;font-weight:700;border-radius:8px;box-shadow:0 2px 8px rgba(176,58,46,.3)}
.brand h1{margin:0;font-family:"Noto Serif SC","Songti SC",serif;font-size:26px;letter-spacing:2px}
.brand p{margin:2px 0 0;color:var(--muted);font-size:13px}
.top-actions{display:flex;align-items:center;gap:12px}
.ghost-btn{background:transparent;border:1px solid var(--line);border-radius:8px;padding:7px 14px;font-size:14px;color:var(--ink)}
.ghost-btn:hover{border-color:var(--red);color:var(--red)}
.primary-btn{background:var(--red);color:#fff;border:0;border-radius:8px;padding:10px 22px;font-size:15px}
.primary-btn:hover{background:#933025}
.primary-btn:disabled{background:#cbb9a5;cursor:not-allowed}

main{flex:1;width:100%;max-width:880px;margin:0 auto;padding:28px 20px 40px}
.intro{color:var(--muted);font-size:15px;line-height:1.7;margin:0 0 8px}
.privacy{color:var(--done);font-size:14px;font-weight:600;margin:0 0 22px}

.layout{display:grid;grid-template-columns:1fr 320px;gap:18px;align-items:start}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:22px}
.field-label{display:block;font-size:13px;font-weight:600;color:var(--ink);margin-bottom:8px}
textarea{width:100%;border:1px solid var(--line);border-radius:10px;background:#fff;padding:12px 14px;font-size:15px;font-family:inherit;color:var(--ink);resize:vertical;min-height:96px}
textarea:focus{outline:none;border-color:var(--gold)}
.row-between{display:flex;justify-content:space-between;gap:12px;margin-top:8px;flex-wrap:wrap}
.muted{color:var(--muted)}
.small{font-size:12px}
.error{color:var(--red);background:var(--red-soft);border-radius:8px;padding:10px 12px;font-size:14px;margin:12px 0 0}
.warn{color:#8a5a12;background:#f7ead0;border:1px solid #e6cf9a;border-radius:8px;padding:10px 12px;font-size:14px;margin:14px 0 0}

.controls-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:18px}
.field{display:block}
select{width:100%;padding:8px;border:1px solid var(--line);border-radius:8px;background:#fff;color:var(--ink);font-size:14px}
input[type="color"]{width:100%;height:38px;border:1px solid var(--line);border-radius:8px;background:#fff;padding:2px;cursor:pointer}

.preview-card{text-align:center}
#qrWrap{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:264px}
#qrCanvas{image-rendering:pixelated;max-width:100%;height:auto;border-radius:4px}
#qrWrap.dim{opacity:.25}
.actions{display:flex;gap:10px;justify-content:center;margin-top:18px;flex-wrap:wrap}
.toast{color:var(--done);font-size:13px;margin:12px 0 0;min-height:16px}

footer{border-top:1px solid var(--line);padding:20px 28px;text-align:center;color:var(--muted);font-size:13px}
.foot-links{display:flex;flex-wrap:wrap;gap:8px 20px;justify-content:center;align-items:center;margin-bottom:12px}
.foot-label{font-weight:600;color:var(--ink)}
.foot-links a{color:var(--muted);text-decoration:none}
.foot-links a:hover{color:var(--red);text-decoration:underline}

@media (max-width:720px){
  .layout{grid-template-columns:1fr}
  main{padding:20px 14px 32px}
}