:root{
  --ink:#1a1a1a; --sub:#666; --line:#e5e5e5; --bg:#fafaf8;
  --accent:#8b1e1e; --accent2:#a83232; --hover:#f0ece6;
}
*{box-sizing:border-box;margin:0;padding:0}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--bg); color:var(--ink); line-height:1.75;
  -webkit-font-smoothing:antialiased; padding-bottom:60px;
}
.hidden{display:none!important}

.top{
  display:flex;align-items:baseline;gap:12px;padding:16px 20px;
  border-bottom:1px solid var(--line); background:#fff; position:sticky;top:0;z-index:10;
}
.logo{font-size:17px;font-weight:700;letter-spacing:.5px}
.logo::before{content:"◆";color:var(--accent);margin-right:6px;font-size:12px}
.tag{font-size:12px;color:var(--sub);letter-spacing:.5px}

.gate{max-width:520px;margin:0 auto;padding:60px 24px;text-align:center}
.gate h1{font-size:26px;line-height:1.5;font-weight:700;letter-spacing:.5px}
.gate .sub{color:var(--sub);font-size:14px;margin:14px 0 36px}
.gate .foot{color:#999;font-size:12px;margin-top:40px}

.card{background:#fff;border:1px solid var(--line);border-radius:4px;padding:26px;text-align:left}
.card label{display:block;font-size:13px;color:var(--sub);margin-bottom:8px}
.card input{
  width:100%;padding:13px 14px;border:1px solid var(--line);border-radius:3px;
  font-size:16px;font-family:ui-monospace,Menlo,monospace;letter-spacing:1px;
  background:#fdfdfc; outline:none; transition:.15s;
}
.card input:focus{border-color:var(--accent);background:#fff}
.hint{font-size:12px;color:#999;margin-top:14px;text-align:center}
.hint.center{text-align:center}
.hint a{color:var(--accent);text-decoration:none}
.hint a:hover{text-decoration:underline}

button{
  font-family:inherit;font-size:15px;cursor:pointer;border:none;border-radius:3px;
  transition:.15s; letter-spacing:.5px;
}
.primary{
  width:100%;padding:14px;background:var(--accent);color:#fff;margin-top:18px;font-weight:600;
}
.primary:hover{background:var(--accent2)}
.primary:disabled{background:#c9c4bd;cursor:not-allowed}
.primary.big{padding:16px;font-size:16px;margin-top:28px}
.ghost{
  padding:11px 18px;background:#fff;border:1px solid var(--line);color:var(--ink);
}
.ghost:hover{background:var(--hover);border-color:#ccc}
.link{background:none;color:var(--sub);font-size:13px;padding:4px 0}
.link:hover{color:var(--accent)}

main{max-width:820px;margin:0 auto;padding:24px 20px}
.bar{
  display:flex;justify-content:space-between;align-items:center;
  padding:10px 0;font-size:13px;color:var(--sub);border-bottom:1px solid var(--line);margin-bottom:26px;
}

h2{font-size:20px;font-weight:700;letter-spacing:.5px}
.sub{color:var(--sub);font-size:13px;margin:6px 0 26px}

.field{margin-bottom:22px}
.field label{display:block;font-size:14px;font-weight:600;margin-bottom:7px}
.field label .req{color:var(--accent);margin-left:3px}
.field .fhint{font-size:12px;color:#999;margin-top:6px;line-height:1.6}
.field input[type=text],.field select,.field textarea{
  width:100%;padding:11px 13px;border:1px solid var(--line);border-radius:3px;
  font-size:14px;font-family:inherit;background:#fff;outline:none;transition:.15s;color:var(--ink);
}
.field textarea{min-height:96px;resize:vertical;line-height:1.7}
.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(139,30,30,.06)}

.output{
  background:#fff;border:1px solid var(--line);border-radius:4px;
  padding:38px 42px;font-size:15.5px;line-height:2.1;min-height:300px;
  font-family:"Songti SC","SimSun",serif;white-space:pre-wrap;word-break:break-word;
}
.output:empty::before{content:"生成中…";color:#ccc}
.actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:20px}

.toast{
  position:fixed;left:50%;bottom:40px;transform:translateX(-50%) translateY(20px);
  background:rgba(26,26,26,.92);color:#fff;padding:11px 22px;border-radius:4px;
  font-size:14px;opacity:0;pointer-events:none;transition:.25s;z-index:99;max-width:80vw;
}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

@media(max-width:600px){
  .gate{padding:40px 20px}
  .gate h1{font-size:22px}
  .output{padding:24px 20px;font-size:15px;line-height:2}
  main{padding:16px}
}