:root {
  --bg: #f4f2ed;
  --surface: #ffffff;
  --surface-2: #faf8f4;
  --ink: #1b1f2a;
  --muted: #667085;
  --line: #e3dfd6;
  --accent: #17324d;
  --accent-ink: #ffffff;
  --accent-soft: #e6edf4;
  --copper: #b4622d;
  --ok: #1f7a4d;
  --warn: #a15c00;
  --err: #b42318;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(20, 30, 50, .05), 0 6px 24px rgba(20, 30, 50, .06);
  --sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --serif: 'Source Serif 4', Georgia, 'Times New Roman', serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f141b;
    --surface: #171e28;
    --surface-2: #1c2531;
    --ink: #e8ebf0;
    --muted: #96a0b0;
    --line: #2a3442;
    --accent: #7fb2e5;
    --accent-ink: #0b1118;
    --accent-soft: #1d2b3b;
    --copper: #e0955f;
    --ok: #55c28b;
    --warn: #f0b04a;
    --err: #ff8a7d;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 6px 24px rgba(0, 0, 0, .25);
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.5 var(--sans);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, p { margin: 0; }
code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .9em; background: var(--accent-soft); padding: 1px 5px; border-radius: 5px; }
.muted { color: var(--muted); }
.small { font-size: 13px; }

/* ---------- Cabecera ---------- */
.topbar {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 14px clamp(16px, 3vw, 32px);
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 20;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand h1 { font: 700 18px/1.1 var(--sans); letter-spacing: -.01em; }
.brand p { font-size: 12.5px; color: var(--muted); }
.logo {
  display: grid; place-items: center; width: 42px; height: 42px; border-radius: 11px;
  background: var(--accent); color: var(--accent-ink);
}

/* ---------- Layout ---------- */
.layout {
  display: grid; grid-template-columns: minmax(340px, 430px) 1fr; gap: 22px;
  padding: 22px clamp(16px, 3vw, 32px) 40px; max-width: 1500px; margin: 0 auto;
  align-items: start;
}
.panel {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 20px;
}
.left { display: flex; flex-direction: column; gap: 14px; }
.panel-title { font: 700 13px/1 var(--sans); text-transform: uppercase; letter-spacing: .07em; color: var(--muted); margin-top: 4px; }

/* ---------- Botones ---------- */
.btn {
  font: 600 14px/1 var(--sans); cursor: pointer; border-radius: 10px; padding: 12px 18px;
  border: 1px solid var(--line); background: var(--surface); color: var(--ink);
  transition: background .15s, border-color .15s, transform .05s;
}
.btn:hover { background: var(--surface-2); border-color: var(--muted); }
.btn:active { transform: translateY(1px); }
.btn:focus-visible, .tab:focus-visible, .drop:focus-visible, select:focus-visible, textarea:focus-visible, input:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn.primary:hover { filter: brightness(1.08); background: var(--accent); }
.btn.ghost { background: transparent; }
.btn.small { padding: 8px 12px; font-size: 13px; }
.btn:disabled { opacity: .55; cursor: not-allowed; }
.link { background: none; border: 0; padding: 0; color: var(--accent); font: inherit; font-weight: 600; text-decoration: underline; cursor: pointer; }

/* ---------- Selector de entrada ---------- */
.stack { display: flex; flex-direction: column; gap: 14px; }
.mode { display: grid; grid-template-columns: 1fr 1fr; gap: 4px; padding: 4px; background: var(--surface-2); border: 1px solid var(--line); border-radius: 12px; }
.mode-btn { border: 0; background: transparent; padding: 10px; border-radius: 9px; font: 600 14px var(--sans); color: var(--muted); cursor: pointer; }
.mode-btn:hover { color: var(--ink); }
.mode-btn.active { background: var(--surface); color: var(--accent); box-shadow: var(--shadow); }
.mode-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.paste {
  width: 100%; min-height: 210px; resize: vertical; border: 1px solid var(--line); border-radius: 12px; padding: 14px;
  background: var(--surface); color: var(--ink); font: 400 15px/1.6 var(--serif);
}

/* ---------- Zona de subida ---------- */
.drop {
  display: flex; flex-direction: column; align-items: center; text-align: center; gap: 6px;
  padding: 26px 16px; border: 2px dashed var(--line); border-radius: 12px; background: var(--surface-2);
  color: var(--muted); cursor: pointer; transition: border-color .15s, background .15s;
}
.drop strong { color: var(--ink); font-size: 15px; }
.drop span { font-size: 13px; }
.drop svg { color: var(--accent); }
.drop:hover, .drop.over { border-color: var(--accent); background: var(--accent-soft); }
.drop-actions { display: flex; gap: 8px; margin-top: 8px; }

.files { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.file {
  display: grid; grid-template-columns: 46px 1fr auto; gap: 10px; align-items: center;
  padding: 8px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface-2);
}
.file .thumb {
  width: 46px; height: 58px; border-radius: 6px; object-fit: cover; background: var(--accent-soft);
  display: grid; place-items: center; color: var(--accent); font: 700 11px var(--sans); overflow: hidden;
}
.file .thumb img { width: 100%; height: 100%; object-fit: cover; }
.file .meta { min-width: 0; }
.file .name { font-weight: 600; font-size: 13.5px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.file .sub { font-size: 12px; color: var(--muted); }
.file .sub.err { color: var(--err); }
.file .ops { display: flex; gap: 4px; }
.icon-btn {
  width: 30px; height: 30px; border-radius: 8px; border: 1px solid var(--line); background: var(--surface);
  color: var(--ink); cursor: pointer; font-size: 14px; line-height: 1;
}
.icon-btn:hover { border-color: var(--muted); }
.icon-btn:disabled { opacity: .35; cursor: default; }

/* ---------- Opciones ---------- */
.options { display: grid; gap: 12px; }
.options label { display: grid; gap: 5px; font-size: 13px; font-weight: 600; color: var(--muted); }
select {
  font: 500 14px var(--sans); color: var(--ink); background: var(--surface);
  border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px;
}
.options .check { display: flex; gap: 10px; align-items: flex-start; font-weight: 400; line-height: 1.4; }
.options .check input { margin-top: 3px; accent-color: var(--accent); width: 16px; height: 16px; }
.options .check strong { color: var(--ink); }

.cta { display: flex; gap: 10px; }
.cta .primary { flex: 1; padding: 14px 18px; font-size: 15px; }

/* ---------- Progreso ---------- */
.steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.steps li { display: flex; align-items: center; gap: 10px; font-size: 13.5px; color: var(--muted); }
.steps i {
  width: 18px; height: 18px; border-radius: 50%; border: 2px solid var(--line); flex: none;
  display: grid; place-items: center; font-style: normal; font-size: 11px; font-weight: 700; color: #fff;
}
.steps li.active { color: var(--ink); font-weight: 600; }
.steps li.active i { border-color: var(--accent); border-top-color: transparent; animation: spin .8s linear infinite; }
.steps li.done { color: var(--ink); }
.steps li.done i { background: var(--ok); border-color: var(--ok); }
.steps li.done i::after { content: '✓'; }
.steps li.error i { background: var(--err); border-color: var(--err); }
.steps li.error i::after { content: '!'; }
.steps li.skipped { opacity: .5; text-decoration: line-through; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- Resultados ---------- */
.results { padding: 0; overflow: hidden; display: flex; flex-direction: column; min-height: 640px; }
.tabs { display: flex; gap: 2px; padding: 8px 8px 0; background: var(--surface-2); border-bottom: 1px solid var(--line); overflow-x: auto; }
.tab {
  display: flex; align-items: center; gap: 8px; border: 0; background: transparent; cursor: pointer;
  padding: 12px 16px; font: 600 14px var(--sans); color: var(--muted); border-radius: 10px 10px 0 0; white-space: nowrap;
  border-bottom: 2px solid transparent;
}
.tab:hover { color: var(--ink); }
.tab.active { color: var(--accent); background: var(--surface); border-bottom-color: var(--accent); }
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--line); }
.tab[data-status='loading'] .dot { background: var(--copper); animation: pulse 1s ease-in-out infinite; }
.tab[data-status='done'] .dot { background: var(--ok); }
.tab[data-status='error'] .dot { background: var(--err); }
@keyframes pulse { 50% { opacity: .35; } }

.toolbar { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 10px 16px; border-bottom: 1px solid var(--line); flex-wrap: wrap; }
.tool-buttons { display: flex; gap: 8px; flex-wrap: wrap; }

.panes { flex: 1; position: relative; }
.pane { display: none; }
.pane.active { display: block; }
.empty { display: flex; flex-direction: column; align-items: center; text-align: center; gap: 10px; padding: 80px 28px; color: var(--muted); max-width: 520px; margin: 0 auto; }
.empty svg { color: var(--accent); opacity: .7; }
.empty h3 { color: var(--ink); font-size: 18px; }

.banner { margin: 14px 18px 0; padding: 10px 14px; border-radius: 10px; background: var(--accent-soft); font-size: 13.5px; }

.transcript {
  display: block; width: 100%; min-height: 520px; height: 62vh; resize: vertical; border: 0; background: transparent; color: var(--ink);
  padding: 22px clamp(18px, 4vw, 44px); font: 400 16px/1.75 var(--serif);
}

.paper {
  padding: 28px clamp(18px, 5vw, 56px) 40px; font: 400 17px/1.75 var(--serif); color: var(--ink); max-width: 860px; margin: 0 auto;
}
.paper h1 { font: 700 28px/1.2 var(--sans); color: var(--accent); margin: 0 0 18px; letter-spacing: -.02em; }
.paper h2 { font: 700 20px/1.3 var(--sans); color: var(--accent); margin: 30px 0 10px; padding-bottom: 6px; border-bottom: 1px solid var(--line); }
.paper h3 { font: 700 17px/1.3 var(--sans); margin: 22px 0 6px; }
.paper p { margin: 0 0 14px; }
.paper ul, .paper ol { padding-left: 24px; margin: 0 0 14px; }
.paper li { margin: 4px 0; }
.paper li > ul, .paper li > ol { margin: 4px 0; }
.paper strong { color: var(--ink); }
.paper table { border-collapse: collapse; width: 100%; margin: 14px 0; font: 400 15px var(--sans); }
.paper th, .paper td { border: 1px solid var(--line); padding: 8px 12px; text-align: left; }
.paper th { background: var(--surface-2); }
.paper blockquote { margin: 14px 0; padding: 4px 16px; border-left: 3px solid var(--copper); color: var(--muted); }
.paper hr { border: 0; border-top: 1px solid var(--line); margin: 24px 0; }
.paper.streaming::after { content: '▍'; color: var(--copper); animation: pulse 1s steps(2) infinite; }

.footnote { padding: 12px 18px 16px; border-top: 1px solid var(--line); }

/* ---------- Avisos y diálogo ---------- */
#toasts { position: fixed; right: 16px; bottom: 16px; display: grid; gap: 8px; z-index: 50; max-width: min(92vw, 420px); }
.toast {
  padding: 12px 14px; border-radius: 10px; background: var(--ink); color: var(--bg); font-size: 14px; box-shadow: var(--shadow);
  border-left: 4px solid var(--accent); animation: rise .2s ease-out;
}
.toast.warn { border-left-color: var(--warn); }
.toast.error { border-left-color: var(--err); }
.toast.ok { border-left-color: var(--ok); }
@keyframes rise { from { transform: translateY(8px); opacity: 0; } }

dialog { border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); color: var(--ink); padding: 22px; width: min(92vw, 380px); box-shadow: var(--shadow); }
dialog::backdrop { background: rgba(10, 15, 25, .5); }
dialog h3 { font-size: 18px; margin-bottom: 6px; }
dialog input {
  width: 100%; margin: 14px 0; padding: 11px 12px; border: 1px solid var(--line); border-radius: 10px;
  background: var(--surface); color: var(--ink); font: 15px var(--sans);
}
.dialog-actions { display: flex; justify-content: flex-end; gap: 8px; }

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .layout { grid-template-columns: 1fr; }
  .results { min-height: 520px; }
}
@media (max-width: 520px) {
  .brand p { display: none; }
  .tool-buttons .btn { flex: 1; }
}
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}