:root{
  --bg:#f4f6fb; --panel:#fff; --text:#172033; --muted:#667085;
  --line:#d8deea; --primary:#2563eb; --primary-dark:#1748ad;
  --success:#137a49; --danger:#b42318; --radius:18px; --font-size:18px;
  --shadow:0 10px 30px rgba(28,39,65,.08);
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--bg);color:var(--text);
  font-family:-apple-system,BlinkMacSystemFont,"Helvetica Neue","Hiragino Sans","Yu Gothic",sans-serif;
  font-size:var(--font-size);line-height:1.55
}
button,input,textarea,select{font:inherit}
button{min-height:48px;border:0;border-radius:13px;padding:11px 14px;background:#e9edf5;color:#22304a;font-weight:760;cursor:pointer}
button:disabled{opacity:.45;cursor:not-allowed}
button.primary{background:var(--primary);color:#fff}
button.primary:active{background:var(--primary-dark)}
button.ghost{background:transparent;border:1px solid var(--line)}
.danger-text{color:var(--danger)}
.app-shell{max-width:1220px;margin:0 auto;padding:calc(18px + env(safe-area-inset-top)) 18px calc(40px + env(safe-area-inset-bottom))}
.topbar{display:flex;justify-content:space-between;gap:20px;align-items:flex-start;margin-bottom:16px}
.eyebrow{font-size:.75rem;font-weight:850;letter-spacing:.08em;text-transform:uppercase;color:var(--primary)}
h1{font-size:clamp(27px,3.3vw,42px);line-height:1.15;margin:4px 0 5px}
h2{font-size:1.12rem;margin:0}
p{margin:.2rem 0;color:var(--muted)}
.version{background:#e8efff;border:1px solid #cad8ff;color:#24499f;border-radius:999px;padding:7px 11px;font-size:.76rem;font-weight:800}
.notice{background:#fff8e7;border:1px solid #efd495;color:#6d4d00;border-radius:14px;padding:12px 14px;margin-bottom:16px;font-size:.84rem}
.layout{display:grid;grid-template-columns:minmax(0,1fr) 355px;gap:16px}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px}
.editor-panel{display:grid;gap:15px}
.section-title{display:flex;justify-content:space-between;gap:14px;align-items:center}
.field{display:grid;gap:7px}
.field>span{font-weight:780;font-size:.9rem}
input,textarea,select{width:100%;border:1px solid #c8d0de;border-radius:13px;background:#fff;color:var(--text);padding:13px 14px;outline:none}
input:focus,textarea:focus,select:focus{border-color:var(--primary);box-shadow:0 0 0 4px rgba(37,99,235,.12)}
textarea{resize:vertical}
.option-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}
.check{display:flex;align-items:center;gap:9px;border:1px solid var(--line);background:#fafbfe;border-radius:13px;padding:11px 12px;font-size:.82rem;font-weight:650}
.check input{width:22px;height:22px;margin:0;accent-color:var(--primary)}
.settings-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.primary-actions{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.sidebar{display:grid;gap:16px;align-content:start}
.sticky-card{position:sticky;top:14px;display:grid;gap:12px}
.status-text{font-weight:800}
.progress{height:10px;background:#e6eaf1;border-radius:999px;overflow:hidden}
.progress span{display:block;width:0;height:100%;background:var(--primary);transition:width .2s}
.small{font-size:.75rem;color:var(--muted)}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.stats div{background:#f6f8fc;border:1px solid var(--line);border-radius:12px;text-align:center;padding:9px}
.stats strong{display:block;font-size:1.05rem}
.stats span{display:block;color:var(--muted);font-size:.68rem}
.tools-card{display:grid;gap:10px}
.file-button{display:flex;min-height:48px;align-items:center;justify-content:center;border-radius:13px;background:#e9edf5;color:#22304a;font-weight:760;cursor:pointer}
.file-button input{display:none}
.results{margin-top:18px}
.parts{display:grid;gap:13px;margin-top:12px}
.empty{background:#fff;border:1px dashed #b8c2d3;border-radius:16px;text-align:center;color:var(--muted);padding:28px}
.part{background:#fff;border:1px solid var(--line);border-radius:16px;overflow:hidden;box-shadow:var(--shadow)}
.part.done{border-color:#a8d9bd;background:#f6fcf8}
.part-head{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:12px 14px;border-bottom:1px solid var(--line)}
.part-title{font-weight:850}
.part-meta{font-size:.72rem;color:var(--muted)}
.part textarea{border:0;border-radius:0;box-shadow:none;min-height:220px;background:transparent;font:0.8rem/1.6 ui-monospace,SFMono-Regular,Menlo,monospace}
.part-actions{display:grid;grid-template-columns:1fr 1fr;gap:9px;padding:12px;border-top:1px solid var(--line)}
.toast{position:fixed;left:50%;bottom:calc(22px + env(safe-area-inset-bottom));transform:translate(-50%,20px);opacity:0;pointer-events:none;background:#111827;color:#fff;padding:11px 16px;border-radius:999px;font-weight:750;transition:.2s;z-index:100;box-shadow:var(--shadow)}
.toast.show{opacity:1;transform:translate(-50%,0)}
@media(max-width:860px){.layout{grid-template-columns:1fr}.sticky-card{position:static}}
@media(max-width:580px){
  body{font-size:17px}.app-shell{padding-left:12px;padding-right:12px}.panel{padding:14px;border-radius:15px}
  .topbar{display:block}.version{display:inline-block;margin-top:8px}.option-grid,.settings-grid,.primary-actions,.part-actions{grid-template-columns:1fr}
}


/* v1.1 */
.url-title-block{display:grid;gap:13px}
.input-with-button{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:9px}
.input-with-button button{white-space:nowrap}
.transcript-field textarea{min-height:360px}
.quick-actions{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.advanced{border:1px solid var(--line);border-radius:14px;background:#fafbfe;overflow:hidden}
.advanced summary{cursor:pointer;padding:13px 14px;font-weight:780;list-style-position:inside}
.advanced-body{display:grid;gap:14px;padding:0 14px 14px}
.part-progress-list{display:flex;gap:6px;flex-wrap:wrap}
.part-dot{
  min-width:34px;height:34px;border-radius:999px;border:1px solid var(--line);
  background:#f4f6fa;display:inline-flex;align-items:center;justify-content:center;
  font-size:.72rem;font-weight:800;color:var(--muted)
}
.part-dot.done{background:#e9f7ef;border-color:#addbc0;color:var(--success)}
.part-dot.next{background:#e8efff;border-color:#bbcdfd;color:#20499f}
@media(max-width:580px){
  .input-with-button,.quick-actions{grid-template-columns:1fr}
  .transcript-field textarea{min-height:300px}
}

/* v1.2 YouTube metadata */
.metadata-card{display:grid;grid-template-columns:160px minmax(0,1fr);gap:14px;align-items:center;padding:12px;border:1px solid var(--line);border-radius:14px;background:#f8faff}
.metadata-card[hidden]{display:none}
.metadata-card img{width:160px;aspect-ratio:16/9;object-fit:cover;border-radius:10px;background:#e8ebf1}
.metadata-copy{display:grid;gap:5px;min-width:0}
.metadata-copy strong{font-size:1rem;line-height:1.45}
.metadata-copy span,.metadata-copy small{color:var(--muted)}
@media(max-width:580px){.metadata-card{grid-template-columns:110px minmax(0,1fr)}.metadata-card img{width:110px}}


/* v1.3 sending workflow */
.transcript-field textarea{
  min-height:520px;
  height:min(58vh,760px);
}
.results-title{align-items:flex-end}
.view-toggle{
  display:flex;align-items:center;gap:8px;
  border:1px solid var(--line);border-radius:13px;
  background:#fff;padding:9px 12px;
  font-size:.78rem;font-weight:760;white-space:nowrap
}
.view-toggle input{width:21px;height:21px;margin:0;accent-color:var(--primary)}
.workflow-note{line-height:1.5;margin-top:-3px}
.part.is-next{border:2px solid #9bb8ff}
.part.is-next .part-head{background:#f4f7ff}
.part-actions.single{grid-template-columns:1fr}
.part-actions .copy-open-btn{min-height:54px}
.completed-card{
  background:#f6fcf8;border:1px solid #acd9bf;border-radius:16px;
  padding:24px;text-align:center;display:grid;gap:12px
}
.completed-card strong{font-size:1.08rem;color:var(--success)}
@media(max-width:580px){
  .transcript-field textarea{min-height:430px;height:55vh}
  .results-title{align-items:flex-start;flex-direction:column}
  .view-toggle{width:100%;justify-content:center}
}