:root {
  --bg: #f6f8fb;
  --panel: #ffffff;
  --ink: #16202b;
  --muted: #5d6b7a;
  --line: #e3e9f0;
  --brand: #1f6feb;
  --brand-ink: #ffffff;
  --ok: #117a3d;
  --err: #b42318;
  --radius: 14px;
  --shadow: 0 1px 3px rgba(16,32,43,.08), 0 8px 24px rgba(16,32,43,.06);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-text-size-adjust: 100%;
}

/* Site nav — shared across all pages (layout only, tool logic untouched) */
.site-nav {
  display: flex;
  align-items: center;
  gap: 16px;
  max-width: 760px;
  margin: 0 auto;
  padding: 14px 16px;
}
.site-nav .brand {
  font-weight: 700;
  font-size: 16px;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: .2px;
}
.site-nav ul {
  list-style: none;
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 0;
  margin-left: auto;
}
.site-nav a {
  display: inline-block;
  padding: 6px 10px;
  border-radius: 9px;
  font-size: 14px;
  color: var(--muted);
  text-decoration: none;
}
.site-nav a:hover { color: var(--brand); background: #eef4ff; }
.site-nav a.active { color: var(--brand); background: #eaf2ff; font-weight: 600; }

.app {
  max-width: 760px;
  margin: 0 auto;
  padding: 24px 16px 48px;
}

.top h1 {
  font-size: 28px;
  line-height: 1.2;
  margin: 0 0 6px;
}
.tagline {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

/* Tool — the first thing the user sees */
.tool {
  margin-top: 20px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px;
}

.dropzone {
  border: 2px dashed #c4d2e0;
  border-radius: 12px;
  background: #fbfdff;
  padding: 36px 16px;
  text-align: center;
  cursor: pointer;
  transition: border-color .15s, background .15s;
  outline: none;
}
.dropzone:hover,
.dropzone:focus-visible { border-color: var(--brand); background: #f3f8ff; }
.dropzone.drag {
  border-color: var(--brand);
  background: #eaf2ff;
}
.dz-icon { font-size: 34px; color: var(--brand); line-height: 1; }
.dz-main { font-size: 17px; font-weight: 600; margin: 10px 0 4px; }
.dz-sub { font-size: 13px; color: var(--muted); margin: 0; }

.controls {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 16px;
}
.ctl { display: flex; flex-direction: column; gap: 4px; font-size: 13px; color: var(--muted); }
.ctl select {
  font-size: 14px;
  color: var(--ink);
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: #fff;
  min-width: 180px;
}
.ghost {
  margin-left: auto;
  align-self: flex-end;
  font-size: 13px;
  color: var(--muted);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 9px;
  padding: 8px 12px;
  cursor: pointer;
}
.ghost:hover { border-color: var(--muted); }

.engine-status {
  font-size: 12.5px;
  color: var(--muted);
  margin: 14px 0 0;
  min-height: 16px;
}
.engine-status.busy { color: var(--brand); }
.engine-status.err { color: var(--err); }

.file-list { list-style: none; margin: 12px 0 0; padding: 0; display: grid; gap: 10px; }
.file-row {
  display: flex;
  align-items: center;
  gap: 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 12px;
  background: #fff;
}
.file-meta { min-width: 0; flex: 1; }
.file-name {
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.file-sub { font-size: 12px; color: var(--muted); margin-top: 2px; }
.file-sub.ok { color: var(--ok); }
.file-sub.err { color: var(--err); }
.file-sub.busy { color: var(--brand); }

.bar { height: 6px; background: #eef2f7; border-radius: 6px; overflow: hidden; margin-top: 6px; }
.bar > i { display: block; height: 100%; width: 0; background: var(--brand); transition: width .2s; }

.dl {
  font-size: 13px;
  font-weight: 600;
  color: var(--brand-ink);
  background: var(--brand);
  border: none;
  border-radius: 9px;
  padding: 8px 14px;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
}
.dl[disabled] { background: #b9c6d6; cursor: default; }

/* Promise + support */
.promise, .support {
  margin-top: 22px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px;
}
.promise h2, .support h2 { font-size: 18px; margin: 0 0 10px; }
.promise ul, .support ul { margin: 0; padding-left: 18px; color: var(--muted); font-size: 14px; line-height: 1.6; }
.promise strong { color: var(--ink); }

.support-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.support-grid h3 { font-size: 14px; margin: 0 0 6px; }
.support-grid ul { padding-left: 16px; font-size: 13px; }
.note { font-size: 12.5px; color: var(--muted); margin: 12px 0 0; }

.foot { margin-top: 24px; text-align: center; color: var(--muted); font-size: 12px; }
.foot-links { margin: 0 0 8px; }
.foot-links a { color: var(--brand); text-decoration: none; }
.foot-links a:hover { text-decoration: underline; }

/* Simple content page (About / Privacy / Contact) */
.page { margin-top: 8px; background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 22px; }
.page h1 { font-size: 24px; margin: 0 0 4px; }
.page .lead { color: var(--muted); margin: 0 0 18px; font-size: 15px; }
.page h2 { font-size: 17px; margin: 22px 0 8px; }
.page p, .page li { color: var(--muted); font-size: 14px; line-height: 1.65; }
.page ul { padding-left: 18px; }
.page a { color: var(--brand); text-decoration: none; }
.page a:hover { text-decoration: underline; }
.page .contact-mail { font-weight: 600; color: var(--ink); }

/* Mobile */
@media (max-width: 520px) {
  .site-nav { flex-wrap: wrap; gap: 8px; padding: 12px 14px; }
  .site-nav ul { width: 100%; margin-left: 0; justify-content: space-between; }
  .site-nav a { padding: 6px 8px; font-size: 13px; }
  .top h1 { font-size: 23px; }
  .support-grid { grid-template-columns: 1fr; }
  .dropzone { padding: 28px 12px; }
  .dz-main { font-size: 15px; }
  .file-row { flex-wrap: wrap; }
  .dl { width: 100%; text-align: center; }
}