:root{
  --bg:#F7F6F3; --card:#fff; --ink:#1B1B1F; --muted:#6B6B76; --line:#E7E5E0;
  --accent:#FF6719; --accent-d:#E9560A; --accent-soft:#FFF0E8; --ok:#16A34A;
  --r:16px; --shadow:0 1px 2px rgba(20,20,30,.04),0 8px 28px rgba(20,20,30,.06);
  --ease:cubic-bezier(.2,.7,.2,1);
}
*{box-sizing:border-box}
html,body{margin:0}
body{background:var(--bg);color:var(--ink);font:15px/1.55 Inter,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;-webkit-font-smoothing:antialiased}
.top{max-width:1480px;margin:0 auto;padding:28px 28px 8px}
.brand{display:flex;gap:14px;align-items:center}
.logo{width:40px;height:40px;border-radius:12px;background:var(--accent);color:#fff;display:grid;place-items:center;box-shadow:0 6px 16px rgba(255,103,25,.35)}
.brand h1{margin:0;font-size:20px;line-height:1.3;font-weight:650;letter-spacing:0}
.brand p{margin:2px 0 0;color:var(--muted);font-size:14px;line-height:1.5}
.app{max-width:1480px;margin:0 auto;padding:16px 28px 40px;display:flex;flex-direction:column;gap:18px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow)}

/* source */
.source{padding:16px 18px}
.field-label{display:block;font-size:12px;font-weight:600;color:var(--muted);text-transform:uppercase;letter-spacing:.04em;margin-bottom:8px}
.url-row{display:flex;gap:10px}
.url-wrap{flex:1;display:flex;align-items:center;gap:10px;padding:0 14px;border:1px solid var(--line);border-radius:12px;background:#FCFBFA;color:var(--muted);transition:border-color .2s,box-shadow .2s,background .2s}
.url-wrap:focus-within{border-color:var(--accent);box-shadow:0 0 0 4px rgba(255,103,25,.14);background:#fff}
.url-wrap input{flex:1;border:0;background:transparent;outline:0;font:inherit;font-size:14px;color:var(--ink);padding:12px 0;min-width:0}

/* buttons */
.btn{position:relative;display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1px solid transparent;border-radius:12px;padding:11px 20px;font:inherit;font-size:14px;font-weight:600;line-height:1.2;cursor:pointer;transition:transform .15s var(--ease),background .2s,box-shadow .2s,border-color .2s,opacity .2s;white-space:nowrap}
.btn:active:not(:disabled){transform:scale(.97)}
.btn:disabled{opacity:.45;cursor:not-allowed}
.btn.primary{background:var(--accent);color:#fff;box-shadow:0 6px 16px rgba(255,103,25,.3)}
.btn.primary:hover:not(:disabled){background:var(--accent-d);transform:translateY(-1px)}
.btn.secondary{background:#1B1B1F;color:#fff}
.btn.secondary:hover:not(:disabled){background:#33333a}
.btn.ghost{background:transparent;border-color:var(--line);color:var(--ink)}
.btn.ghost:hover:not(:disabled){background:#F4F2EE}
.btn.ok{background:var(--ok)!important;box-shadow:0 6px 16px rgba(22,163,74,.3)!important}
.spinner{display:none;width:14px;height:14px;border:2px solid rgba(255,255,255,.4);border-top-color:#fff;border-radius:50%;animation:spin .7s linear infinite}
.btn.loading .spinner{display:inline-block}
.btn.loading{pointer-events:none;opacity:.85}
@keyframes spin{to{transform:rotate(360deg)}}

/* panes */
.panes{display:grid;grid-template-columns:1fr 1fr;gap:18px;align-items:stretch}
.pane{display:flex;flex-direction:column;min-width:0;overflow:hidden}
.pane-head{display:flex;align-items:center;justify-content:space-between;padding:14px 16px 12px;gap:12px}
.pane-title{display:flex;align-items:center;gap:10px;font-weight:600;font-size:15px;line-height:1.4}
.step{width:24px;height:24px;border-radius:50%;background:var(--accent-soft);color:var(--accent-d);font-size:12px;font-weight:700;display:grid;place-items:center}
.seg{position:relative;display:inline-flex;background:#F0EEEA;border-radius:10px;padding:3px}
.seg button{position:relative;z-index:1;border:0;background:transparent;font:inherit;font-size:13px;font-weight:600;line-height:1.2;color:var(--muted);padding:6px 14px;border-radius:8px;cursor:pointer;transition:color .2s}
.seg button.active{color:var(--ink)}
.seg-thumb{position:absolute;top:3px;bottom:3px;left:3px;border-radius:8px;background:#fff;box-shadow:0 1px 3px rgba(0,0,0,.12);transition:transform .3s var(--ease),width .3s var(--ease)}

.stage{position:relative;flex:1;min-height:560px;margin:0 16px;border:1px solid var(--line);border-radius:12px;overflow:hidden;background:#fff}
.view{position:absolute;inset:0;opacity:0;visibility:hidden;transform:translateY(6px);transition:opacity .25s var(--ease),transform .25s var(--ease),visibility 0s .25s}
.view.active{opacity:1;visibility:visible;transform:none;transition:opacity .25s var(--ease),transform .25s var(--ease)}
#inFrame{width:100%;height:100%;border:0;display:block;background:#fff}
textarea{width:100%;height:100%;border:0;outline:0;resize:none;padding:16px;font:13px/1.6 "JetBrains Mono",ui-monospace,Menlo,Consolas,monospace;color:#2A2A33;background:#FCFBFA;tab-size:2}
textarea:focus{background:#fff}

.post{position:absolute;inset:0;overflow:auto;padding:28px 32px 40px;outline:0;font:17px/1.7 Georgia,"Times New Roman",serif;color:#1c1c1c}
.post>*{max-width:660px;margin-left:auto;margin-right:auto}
.post h2{font:700 28px/1.3 Inter,system-ui,sans-serif;margin:1.4em auto .5em}
.post h3{font:650 21px/1.4 Inter,system-ui,sans-serif;margin:1.2em auto .5em}
.post p{margin:0 auto 1em}
.post a{color:#c2410c;text-decoration:underline;text-underline-offset:2px}
.post img{max-width:100%;height:auto;display:block;margin:1em auto;border-radius:6px}
.post hr{border:0;text-align:center;margin:2em auto}
.post hr::after{content:"• • •";color:#999;letter-spacing:.4em}
.post blockquote{margin:1.2em auto;padding:2px 0 2px 18px;border-left:3px solid #1c1c1c;color:#333}
.post blockquote>*:last-child{margin-bottom:0}
.post ol,.post ul{padding-left:1.4em;margin:0 auto 1em}
.post li{margin-bottom:.4em}
.post li:last-child{margin-bottom:0}

.empty{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;text-align:center;padding:30px;color:var(--muted);background:#fff;transition:opacity .25s;pointer-events:none;line-height:1.5}
.empty.hide{opacity:0;visibility:hidden}
.empty strong{color:var(--ink);font-size:15px}
.empty span{font-size:14px;max-width:320px}
.empty-icon{width:56px;height:56px;border-radius:16px;background:#F4F2EE;display:grid;place-items:center;margin-bottom:6px;color:var(--muted)}

.options{display:flex;flex-wrap:wrap;gap:8px 18px;padding:14px 16px 0}
.opt{display:inline-flex;align-items:center;gap:9px;font-size:13px;line-height:1.4;color:#44444d;cursor:pointer;user-select:none}
.opt input{position:absolute;opacity:0;pointer-events:none}
.sw{position:relative;width:30px;height:18px;border-radius:99px;background:#D8D5CF;transition:background .2s;flex:none}
.sw::after{content:"";position:absolute;top:2px;left:2px;width:14px;height:14px;border-radius:50%;background:#fff;box-shadow:0 1px 2px rgba(0,0,0,.25);transition:transform .25s var(--ease)}
.opt input:checked+.sw{background:var(--accent)}
.opt input:checked+.sw::after{transform:translateX(12px)}
.opt input:focus-visible+.sw{outline:2px solid var(--accent);outline-offset:2px}

.stats{display:flex;flex-wrap:wrap;gap:8px;padding:14px 16px 0;min-height:14px}
.chip{font-size:12px;font-weight:600;line-height:1.3;padding:5px 10px;border-radius:99px;background:#F0EEEA;color:#55555e;animation:pop .35s var(--ease) both}
.chip b{color:var(--ink)}
@keyframes pop{from{opacity:0;transform:translateY(4px) scale(.96)}to{opacity:1;transform:none}}
.pane-foot{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 16px 16px}
.hint{font-size:13px;color:var(--muted)}
#outPane .pane-foot{justify-content:flex-end}

.toast{position:fixed;left:50%;bottom:28px;transform:translate(-50%,20px);background:#1B1B1F;color:#fff;font-size:14px;line-height:1.4;padding:12px 18px;border-radius:12px;box-shadow:0 12px 32px rgba(0,0,0,.25);opacity:0;pointer-events:none;transition:opacity .25s,transform .3s var(--ease);max-width:min(520px,90vw);z-index:50}
.toast.show{opacity:1;transform:translate(-50%,0)}
.toast.err{background:#B42318}

@media (max-width:1000px){
  .panes{grid-template-columns:1fr}
  .stage{min-height:460px}
  .top,.app{padding-left:16px;padding-right:16px}
  .url-row{flex-direction:column}
}