[hidden]{display:none!important}

:root{
  --bg:#0d1220;
  --panel:#141b2e;
  --panel-2:#1a2340;
  --line:#25304f;
  --text:#eaf0ff;
  --muted:#8b97b8;
  --accent:#5b8bff;
  --accent-2:#7c5bff;
  --danger:#ff5b6e;
  --ok:#3ddc97;
  --radius:14px;
}

*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{
  font-family:'Inter',system-ui,sans-serif;
  background:var(--bg);
  color:var(--text);
  min-height:100vh;
  background-image:radial-gradient(900px 400px at 80% -10%,rgba(124,91,255,.18),transparent),
                   radial-gradient(700px 400px at -10% 20%,rgba(91,139,255,.12),transparent);
}

/* ---------- header ---------- */
.topbar{
  position:sticky;top:0;z-index:50;
  display:flex;align-items:center;gap:28px;
  height:66px;padding:0 24px;
  background:rgba(13,18,32,.78);backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
}
.brand{display:flex;align-items:center;gap:10px;font-family:'Sora',sans-serif;font-weight:800;font-size:1.05rem}
.brand-mark{
  display:grid;place-items:center;width:34px;height:34px;border-radius:10px;
  background:linear-gradient(135deg,var(--accent),var(--accent-2));font-size:1rem;
}
.brand-name .arrow{color:var(--accent);margin:0 2px}
.topnav{display:flex;gap:22px;margin-left:8px}
.topnav a{color:var(--muted);text-decoration:none;font-size:.9rem;font-weight:500;transition:color .15s}
.topnav a:hover{color:var(--text)}
.topbar .btn-accent{margin-left:auto}

/* ---------- buttons ---------- */
.btn{
  font-family:'Inter',sans-serif;font-weight:600;font-size:.9rem;
  border:1px solid transparent;border-radius:10px;padding:10px 18px;
  cursor:pointer;transition:transform .12s,box-shadow .12s,background .15s,opacity .15s;
  color:var(--text);background:var(--panel-2);
}
.btn:hover:not(:disabled){transform:translateY(-1px)}
.btn:active:not(:disabled){transform:translateY(0)}
.btn:disabled{opacity:.45;cursor:not-allowed}
.btn-accent{background:linear-gradient(135deg,var(--accent),var(--accent-2));box-shadow:0 6px 18px rgba(91,139,255,.28)}
.btn-accent:hover:not(:disabled){box-shadow:0 8px 24px rgba(124,91,255,.4)}
.btn-primary{background:var(--accent)}
.btn-danger{background:transparent;border-color:rgba(255,91,110,.5);color:var(--danger)}
.btn-danger:hover:not(:disabled){background:rgba(255,91,110,.12)}
.btn-ghost{background:transparent;border-color:var(--line);color:var(--muted)}
.btn-ghost:hover:not(:disabled){color:var(--text)}
.btn-sm{padding:7px 12px;font-size:.8rem}
.btn-block{width:100%;padding:13px;margin-top:16px;font-size:.95rem}

/* ---------- layout ---------- */
.layout{
  display:grid;grid-template-columns:340px 1fr 300px;gap:20px;
  padding:24px;max-width:1600px;margin:0 auto;
  align-items:start;
}
.panel{
  background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  padding:20px;position:relative;
}
.panel-title{font-family:'Sora',sans-serif;font-size:.82rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-bottom:16px}

/* ---------- dropzone ---------- */
.dropzone{
  position:relative;border:2px dashed var(--line);border-radius:12px;
  min-height:220px;display:grid;place-items:center;cursor:pointer;
  transition:border-color .15s,background .15s;overflow:hidden;background:var(--panel-2);
}
.dropzone:hover,.dropzone:focus-visible,.dropzone.drag{border-color:var(--accent);background:rgba(91,139,255,.08);outline:none}
.dz-inner{text-align:center;padding:24px}
.dz-icon{font-size:2rem;margin-bottom:10px}
.dz-head{font-family:'Sora',sans-serif;font-weight:700;font-size:1rem}
.dz-sub{color:var(--muted);font-size:.82rem;margin-top:6px}
.dz-link{color:var(--accent);font-weight:600;text-decoration:underline}
.mock-preview{max-width:100%;max-height:420px;display:block;object-fit:contain}

.file-meta{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:12px;font-size:.82rem;color:var(--muted);overflow:hidden}
#fileName{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

.field-label{display:block;margin:16px 0 6px;font-size:.8rem;font-weight:600;color:var(--muted)}
.notes-input{
  width:100%;background:var(--panel-2);border:1px solid var(--line);border-radius:10px;
  color:var(--text);font-family:'Inter',sans-serif;font-size:.88rem;padding:10px 12px;resize:vertical;
}
.notes-input:focus{outline:none;border-color:var(--accent)}

/* ---------- error ---------- */
.error-box{
  margin-top:16px;padding:14px 16px;border-radius:10px;
  background:rgba(255,91,110,.1);border:1px solid rgba(255,91,110,.45);
}
.error-box p{font-size:.88rem;color:#ffb4bd}
.error-actions{display:flex;gap:10px;margin-top:12px}

/* ---------- preview ---------- */
.panel-preview{min-height:640px;display:flex;flex-direction:column}
.preview-head{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;margin-bottom:14px}
.preview-head .panel-title{margin-bottom:0}
.preview-tools{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.seg{display:flex;background:var(--panel-2);border:1px solid var(--line);border-radius:10px;padding:3px}
.seg-btn{
  border:0;background:transparent;color:var(--muted);font-family:'Inter',sans-serif;
  font-weight:600;font-size:.8rem;padding:6px 14px;border-radius:8px;cursor:pointer;transition:all .15s;
}
.seg-btn.is-active{background:var(--accent);color:#fff}

.preview-stage{
  position:relative;flex:1;border-radius:12px;border:1px solid var(--line);
  background:repeating-conic-gradient(#171f36 0% 25%,#131a2d 0% 50%) 0 0/24px 24px;
  overflow:hidden;display:flex;justify-content:center;min-height:520px;
}
.preview-empty{
  position:absolute;inset:0;z-index:1;display:grid;place-items:center;text-align:center;padding:40px;
}
.preview-empty p{color:var(--muted);font-size:.92rem;max-width:320px;margin-top:14px}
.pe-badge{
  display:inline-block;font-family:'Sora',sans-serif;font-weight:700;font-size:.75rem;
  letter-spacing:.12em;text-transform:uppercase;color:var(--accent);
  border:1px solid rgba(91,139,255,.4);border-radius:999px;padding:6px 16px;
}
.iframe-wrap{position:relative;z-index:2;width:100%;height:100%;display:flex;justify-content:center;transition:width .35s ease;background:#fff}
.iframe-wrap.mobile{width:375px;border-left:1px solid var(--line);border-right:1px solid var(--line);box-shadow:0 0 40px rgba(0,0,0,.5)}
#previewFrame{width:100%;height:100%;min-height:520px;border:0;background:#fff}

.loading-overlay{
  position:absolute;inset:0;z-index:10;display:grid;place-items:center;align-content:center;gap:10px;
  background:rgba(13,18,32,.86);backdrop-filter:blur(4px);text-align:center;padding:30px;
}
.spinner{
  width:44px;height:44px;border-radius:50%;margin:0 auto 8px;
  border:4px solid var(--line);border-top-color:var(--accent);animation:spin .8s linear infinite;
}
@keyframes spin{to{transform:rotate(360deg)}}
.loading-text{font-family:'Sora',sans-serif;font-weight:700}
.loading-sub{color:var(--muted);font-size:.82rem}

.conv-meta{display:flex;align-items:baseline;gap:12px;margin-top:12px;font-size:.85rem}
.conv-meta strong{font-family:'Sora',sans-serif}
.conv-meta span{color:var(--muted);font-size:.78rem}

/* ---------- history ---------- */
.history-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}
.history-head .panel-title{margin-bottom:0}
.history-status{font-size:.82rem;color:var(--muted);padding:8px 0}
.history-list{list-style:none;display:flex;flex-direction:column;gap:8px;max-height:70vh;overflow-y:auto}
.history-item{
  border:1px solid var(--line);border-radius:10px;padding:12px 14px;cursor:pointer;
  background:var(--panel-2);transition:border-color .15s,transform .12s;
}
.history-item:hover{border-color:var(--accent);transform:translateX(-2px)}
.history-item.is-active{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent) inset}
.hi-title{font-family:'Sora',sans-serif;font-weight:600;font-size:.88rem;display:block;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.hi-date{color:var(--muted);font-size:.74rem;display:block;margin-top:4px}
.hi-notes{color:var(--muted);font-size:.76rem;display:block;margin-top:4px;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-style:italic}
.history-empty{color:var(--muted);font-size:.85rem;padding:12px 0}

/* ---------- toast ---------- */
.toast{
  position:fixed;bottom:24px;left:50%;transform:translateX(-50%);z-index:100;
  background:var(--panel-2);border:1px solid var(--line);border-radius:10px;
  padding:12px 20px;font-size:.88rem;box-shadow:0 10px 30px rgba(0,0,0,.5);
  animation:toastIn .25s ease;
}
.toast.ok{border-color:rgba(61,220,151,.5);color:var(--ok)}
.toast.err{border-color:rgba(255,91,110,.5);color:var(--danger)}
@keyframes toastIn{from{opacity:0;transform:translate(-50%,10px)}to{opacity:1;transform:translate(-50%,0)}}

/* ---------- responsive ---------- */
@media (max-width:1180px){
  .layout{grid-template-columns:320px 1fr}
  .panel-history{grid-column:1/-1}
  .history-list{max-height:340px}
}
@media (max-width:820px){
  .layout{grid-template-columns:1fr;padding:16px}
  .topnav{display:none}
  .panel-preview{min-height:520px}
  .iframe-wrap.mobile{width:100%;max-width:375px}
}

/* ---------- collapsible history ---------- */
.history-head-btns{display:flex;gap:6px}
.layout.history-collapsed{grid-template-columns:340px 1fr}
.layout.history-collapsed .panel-history{display:none}
.show-history-btn{position:fixed;top:80px;right:16px;z-index:60;background:var(--panel-2);border:1px solid var(--line);box-shadow:0 6px 18px rgba(0,0,0,.4)}
@media (max-width:1180px){
  .layout.history-collapsed{grid-template-columns:320px 1fr}
}
@media (max-width:820px){
  .layout.history-collapsed{grid-template-columns:1fr}
}