:root{
  --bg:#0b1220;
  --bg-soft:#101a2e;
  --panel:#0f1830;
  --panel-2:#13203b;
  --line:#22304f;
  --line-soft:#1a2742;
  --text:#e8eefc;
  --muted:#93a2c4;
  --muted-2:#6f7fa3;
  --accent:#58e1a8;
  --accent-2:#5aa9ff;
  --warn:#ffb454;
  --danger:#ff7a85;
  --radius:14px;
  --shadow:0 18px 50px rgba(0,0,0,.45);
  --mono:"SF Mono",ui-monospace,"JetBrains Mono",Menlo,Consolas,monospace;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  background:radial-gradient(1200px 700px at 80% -10%,#15213b 0%,var(--bg) 55%) fixed;
  color:var(--text);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--accent-2);text-decoration:none}

/* topbar */
.topbar{
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 22px;border-bottom:1px solid var(--line-soft);
  position:sticky;top:0;z-index:20;
  background:rgba(11,18,32,.82);backdrop-filter:blur(10px);
}
.brand{display:flex;align-items:center;gap:12px}
.logo{display:flex}
.brand strong{font-size:16px;display:block;letter-spacing:.2px}
.brand .tag{font-size:11px;color:var(--muted-2);letter-spacing:1.5px;text-transform:uppercase}

/* buttons */
.ghost-btn,.primary-btn{
  font:inherit;font-size:13.5px;cursor:pointer;border-radius:10px;
  padding:9px 16px;border:1px solid var(--line);transition:.15s;
}
.ghost-btn{background:transparent;color:var(--muted);}
.ghost-btn:hover{border-color:var(--accent-2);color:var(--text)}
.primary-btn{
  background:linear-gradient(135deg,var(--accent) 0%,#3fcf90 100%);
  color:#04261a;border:none;font-weight:700;box-shadow:0 6px 18px rgba(88,225,168,.22);
}
.primary-btn:hover{filter:brightness(1.06);transform:translateY(-1px)}

/* layout */
main{max-width:1180px;margin:0 auto;padding:0 22px 60px}
.hero{padding:46px 4px 26px;max-width:760px}
.hero h1{font-size:clamp(26px,4.4vw,40px);line-height:1.18;margin:0 0 14px;letter-spacing:-.5px}
.lede{color:var(--muted);font-size:16px;margin:0}
.lede b{color:var(--text);font-weight:600}

.workspace{
  display:grid;grid-template-columns:minmax(0,420px) minmax(0,1fr);
  gap:22px;align-items:start;
}
.panel{
  background:linear-gradient(180deg,var(--panel) 0%,#0d1626 100%);
  border:1px solid var(--line-soft);border-radius:var(--radius);
  box-shadow:var(--shadow);
}
.input-panel{padding:22px;position:sticky;top:74px}

.field{display:block;margin-bottom:16px}
.field-label{display:block;font-size:13px;font-weight:700;margin-bottom:7px;color:var(--text)}
.field-label em{display:block;font-style:normal;font-weight:400;color:var(--muted-2);font-size:11.5px;margin-top:2px}
textarea,select{
  width:100%;font:inherit;color:var(--text);
  background:var(--bg-soft);border:1px solid var(--line);border-radius:10px;
  padding:11px 12px;outline:none;transition:.15s;
}
textarea{resize:vertical;min-height:78px;font-size:14.5px}
textarea:focus,select:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(88,225,168,.12)}
select{appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%2393a2c4' stroke-width='1.6' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;padding-right:32px}

.examples{display:flex;flex-wrap:wrap;gap:7px;align-items:center;margin:-4px 0 16px}
.examples-label{font-size:12px;color:var(--muted-2)}
.chip{
  font:inherit;font-size:12.5px;cursor:pointer;
  background:var(--panel-2);color:var(--muted);
  border:1px solid var(--line);border-radius:999px;padding:5px 11px;transition:.15s;
}
.chip:hover{border-color:var(--accent-2);color:var(--text)}

.grid-3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:10px}
.grid-3 .field{margin-bottom:8px}
.actions{display:flex;gap:10px;margin-top:8px}
.actions .primary-btn{flex:1}
.disclaimer{font-size:11.5px;color:var(--muted-2);margin:14px 0 0;line-height:1.5}
.disclaimer b{color:var(--warn)}

/* placeholder */
.placeholder{display:flex;align-items:center;justify-content:center;min-height:440px;padding:30px}
.placeholder-inner{text-align:center;max-width:380px;color:var(--muted)}
.ph-icon{font-size:42px;margin-bottom:10px}
.placeholder-inner h3{margin:0 0 8px;color:var(--text)}
.placeholder-inner p{margin:0;font-size:14px}

/* output */
.output-panel{padding:22px}
.output-head{display:flex;justify-content:space-between;align-items:flex-start;gap:14px;flex-wrap:wrap;margin-bottom:6px}
.output-head h2{margin:0;font-size:20px}
.output-meta{margin:4px 0 0;color:var(--muted);font-size:13px}
.output-meta b{color:var(--accent)}
.output-tools{display:flex;gap:8px;flex-wrap:wrap}

.card{
  border:1px solid var(--line-soft);border-radius:12px;
  background:var(--bg-soft);margin-top:16px;overflow:hidden;
}
.card-head{
  display:flex;align-items:center;gap:10px;
  padding:13px 16px;border-bottom:1px solid var(--line-soft);
  background:linear-gradient(180deg,rgba(90,169,255,.06),transparent);
}
.card-num{
  flex:0 0 auto;width:24px;height:24px;border-radius:7px;
  background:var(--panel-2);border:1px solid var(--line);
  display:flex;align-items:center;justify-content:center;
  font-size:12px;font-weight:700;color:var(--accent-2);
}
.card-head h3{margin:0;font-size:15px}
.card-body{padding:14px 16px}
.card-body p{margin:0 0 10px;font-size:14px;color:#d6deef}
.card-body p:last-child{margin-bottom:0}
.card-body ul{margin:0;padding-left:20px}
.card-body li{margin:6px 0;font-size:14px;color:#d6deef}
.card-body li b{color:var(--text)}
.kv{color:var(--accent);font-family:var(--mono);font-size:13px}

pre.code{
  margin:0;background:#070d18;border:1px solid var(--line-soft);border-radius:10px;
  padding:14px;overflow-x:auto;font-family:var(--mono);font-size:12.5px;line-height:1.65;
  color:#c8d4ec;
}
pre.code .cmt{color:#5c6f94}
pre.code .kw{color:#7fb4ff}
pre.code .fn{color:#58e1a8}

/* checklist */
.checklist{list-style:none;padding:0;margin:0}
.checklist li{display:flex;gap:10px;align-items:flex-start;padding:7px 0;border-bottom:1px dashed var(--line-soft)}
.checklist li:last-child{border-bottom:none}
.checklist input{margin-top:3px;accent-color:var(--accent);width:16px;height:16px;flex:0 0 auto}
.checklist label{font-size:14px;color:#d6deef;cursor:pointer}
.checklist li.done label{color:var(--muted-2);text-decoration:line-through}

.risk li b{color:var(--danger)}

/* why */
.why{margin-top:46px}
.why h2{font-size:20px;margin:0 0 16px}
.why-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.why-grid>div{background:var(--panel);border:1px solid var(--line-soft);border-radius:12px;padding:18px}
.why-grid b{color:var(--accent);font-size:14.5px}
.why-grid p{margin:8px 0 0;color:var(--muted);font-size:13.5px}

.foot{border-top:1px solid var(--line-soft);margin-top:50px;padding:22px;text-align:center}
.foot p{margin:0;color:var(--muted-2);font-size:12.5px}

/* toast */
.toast{
  position:fixed;left:50%;bottom:28px;
  transform:translateX(-50%) translateY(20px);
  background:#04261a;color:#bff5dd;border:1px solid var(--accent);
  padding:11px 20px;border-radius:10px;font-size:13.5px;font-weight:600;
  opacity:0;pointer-events:none;transition:.25s;z-index:50;box-shadow:var(--shadow);
}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

@media(max-width:880px){
  .workspace{grid-template-columns:1fr}
  .input-panel{position:static}
  .why-grid{grid-template-columns:1fr}
  .hero{padding:30px 2px 18px}
}
@media(max-width:480px){
  main{padding:0 14px 50px}
  .grid-3{grid-template-columns:1fr}
  .topbar{padding:12px 14px}
  .output-tools{width:100%}
  .output-tools button{flex:1}
}