:root {
  --bg: #f4f7f8;
  --panel: #ffffff;
  --ink: #12222b;
  --muted: #5b6c76;
  --line: #d5e0e5;
  --accent: #0b6f86;
  --accent-ink: #ffffff;
  --accent-soft: #dff1f5;
  --ok: #1b7a4a;
  --ok-soft: #dff3e8;
  --err: #b3261e;
  --err-soft: #fbe5e3;
  --radius: 8px;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1a20;
    --panel: #16252d;
    --ink: #e6eef2;
    --muted: #92a6b1;
    --line: #2a3d47;
    --accent: #4cc3dc;
    --accent-ink: #062830;
    --accent-soft: #17394a;
    --ok: #66d19a;
    --ok-soft: #153a29;
    --err: #ff9a92;
    --err-soft: #432121;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.5 "Segoe UI", system-ui, -apple-system, Roboto, "Helvetica Neue", sans-serif;
}
button, input, select { font: inherit; color: inherit; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

.top {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 14px 24px; background: var(--panel); border-bottom: 1px solid var(--line);
}
.top h1 { margin: 0; font-size: 20px; letter-spacing: .2px; }
.engine { margin: 0; display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: 13px; }
.dot { width: 9px; height: 9px; border-radius: 50%; background: var(--muted); }
.engine[data-state="loading"] .dot { background: #d99a00; animation: pulse 1.2s ease-in-out infinite; }
.engine[data-state="ready"] .dot { background: var(--ok); }
.engine[data-state="error"] .dot { background: var(--err); }
@keyframes pulse { 50% { opacity: .35; } }
@media (prefers-reduced-motion: reduce) { .engine .dot { animation: none !important; } }

.layout { display: grid; grid-template-columns: 300px 1fr; gap: 24px; max-width: 1180px; margin: 0 auto; padding: 24px; }
@media (max-width: 820px) { .layout { grid-template-columns: 1fr; padding: 16px; } }

.side h2 { margin: 18px 0 6px; font-size: 14px; color: var(--muted); font-weight: 600; }
.side h2:first-child { margin-top: 0; }
.tool-btn {
  display: flex; gap: 10px; width: 100%; text-align: left; align-items: baseline;
  padding: 8px 10px; border: 1px solid transparent; border-radius: var(--radius);
  background: transparent; cursor: pointer;
}
.tool-btn:hover:not(:disabled) { background: var(--accent-soft); }
.tool-btn[aria-current="true"] { background: var(--accent-soft); border-color: var(--accent); font-weight: 600; }
.tool-btn:disabled { color: var(--muted); cursor: not-allowed; opacity: .75; }
.tool-btn small { margin-left: auto; font-size: 12px; color: var(--muted); white-space: nowrap; font-weight: 400; }

.card {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px; max-width: 760px;
}
.card h2 { margin: 0 0 4px; font-size: 22px; }
.card .desc { margin: 0 0 8px; color: var(--muted); }
.card .privacy { margin: 0 0 20px; font-size: 13px; color: var(--muted); }

.step { margin-top: 20px; padding-top: 20px; border-top: 1px solid var(--line); }
.step:first-of-type { border-top: 0; padding-top: 0; margin-top: 0; }
.step h3 { margin: 0 0 8px; font-size: 15px; }
.step .hint { margin: 4px 0 0; font-size: 13px; color: var(--muted); }
.step[aria-disabled="true"] { opacity: .5; pointer-events: none; }

.file {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  border: 2px dashed var(--line); border-radius: var(--radius); padding: 14px;
}
.file.drag { border-color: var(--accent); background: var(--accent-soft); }
.file .name { font-weight: 600; word-break: break-all; }
.file .meta { color: var(--muted); font-size: 13px; }

.btn {
  border: 1px solid var(--line); background: var(--panel); border-radius: var(--radius);
  padding: 8px 14px; cursor: pointer;
}
.btn:hover:not(:disabled) { border-color: var(--accent); }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); font-weight: 600; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn.link { border: 0; background: none; color: var(--accent); padding: 4px 0; text-decoration: underline; }

label.field { display: block; margin-bottom: 12px; }
label.field span { display: block; font-weight: 600; margin-bottom: 4px; }
select { width: 100%; padding: 8px 10px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); }

.msg { margin-top: 16px; padding: 12px 14px; border-radius: var(--radius); }
.msg.ok { background: var(--ok-soft); color: var(--ok); }
.msg.err { background: var(--err-soft); color: var(--err); }
.msg.busy { background: var(--accent-soft); }
.msg p { margin: 0 0 6px; }
.msg details { margin-top: 8px; color: var(--ink); }
.msg pre { overflow: auto; max-height: 240px; font-size: 12px; background: var(--panel); padding: 8px; border-radius: 6px; }