:root{--bg:#0b0f10;--panel:#12181a;--elev:#182125;--text:#e5f0e7;--muted:#a7b5ae;--accent:#2ecc71;--accent-2:#159c50;--line:#223136;--danger:#ff6b6b;--notice:#1e7bff;--radius:12px;--shadow:0 10px 30px rgba(0,0,0,.3)}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;background:linear-gradient(180deg,#0b0f10,#0d1214);color:var(--text);font:16px/1.45 system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,"Helvetica Neue",Arial}
a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}
img{display:inline-block}
.visually-hidden{position:absolute!important;height:1px;width:1px;overflow:hidden;clip:rect(1px,1px,1px,1px)}

.app-header{display:flex;justify-content:space-between;align-items:center;padding:16px 20px;border-bottom:1px solid var(--line);position:sticky;top:0;background:rgba(11,15,16,.8);backdrop-filter:saturate(120%) blur(6px);z-index:10}
.brand{display:flex;gap:12px;align-items:center}
.brand .titles h1{margin:0;font-size:18px}
.brand .titles .tagline{margin:2px 0 0;color:var(--muted);font-size:12px}
.actions{display:flex;gap:8px}

.container{max-width:1000px;margin:0 auto;padding:16px;display:grid;gap:16px}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.panel .panel-head{display:flex;align-items:center;justify-content:space-between;padding:12px 14px;border-bottom:1px solid var(--line)}
.panel .panel-head h2{margin:0;font-size:16px}
.panel.notice{border-color:#1e7bff33}
.panel.alert{border-color:#ff6b6b33}
.panel.subtle{background:var(--elev)}
.panel ul{margin:8px 16px;padding-left:18px}

.grid{display:grid;grid-template-columns:repeat(12,1fr);gap:12px;padding:12px}
.field{display:flex;flex-direction:column;gap:6px}
.col-6{grid-column:span 6}.col-3{grid-column:span 3}
.align-end{align-items:flex-end;justify-content:flex-end}
label{font-weight:600;color:var(--muted)}
input[type=text],select{background:var(--elev);border:1px solid var(--line);color:var(--text);border-radius:10px;padding:10px 12px;outline:none}
input[type=text]:focus,select:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(46,204,113,.15)}
.switch{display:flex;align-items:center;gap:8px;cursor:pointer}

.btn{background:linear-gradient(180deg,var(--accent),var(--accent-2));color:#fff;border:0;border-radius:10px;padding:10px 14px;cursor:pointer;font-weight:700}
.btn:hover{filter:brightness(1.05)}
.btn:disabled{opacity:.5;cursor:not-allowed}
.btn.ghost{background:transparent;color:var(--text);border:1px solid var(--line)}

.story{padding:0}
.chat{max-height:50vh;overflow:auto;padding:12px;display:flex;flex-direction:column;gap:12px}
.empty{color:var(--muted);text-align:center;padding:24px}
.msg{display:flex;flex-direction:column;gap:6px}
.bubble{background:var(--elev);border:1px solid var(--line);padding:10px 12px;border-radius:12px;box-shadow:var(--shadow)}
.msg.user .bubble{background:#0f1b16;border-color:#1b3b2b}
.msg.ai .bubble{background:#151e22}
.msg time{color:var(--muted);font-size:12px}

.composer{display:flex;gap:10px;padding:12px;border-top:1px solid var(--line);position:sticky;bottom:0;background:var(--panel);border-bottom-left-radius:var(--radius);border-bottom-right-radius:var(--radius)}
.composer input[type=text]{flex:1}

.progress{position:relative;display:flex;align-items:center;gap:8px}
.progress .bar{height:8px;background:linear-gradient(90deg,var(--accent),#38ef7d);border-radius:6px;box-shadow:inset 0 0 0 1px #0005}
.progress .label{color:var(--muted);font-size:12px;margin-left:8px}
.progress{width:50%}.progress .bar{width:0}

.footnotes{padding:12px;color:var(--muted);border-top:1px solid var(--line)}

.alert ul,.notice ul{margin:0;padding:12px 16px}

@media (max-width:720px){
  .grid{grid-template-columns:repeat(6,1fr)}
  .col-6{grid-column:span 6}
  .col-3{grid-column:span 3}
  .chat{max-height:45vh}
  .progress{width:100%}
}