/* LightTools — clean, fast, no-nonsense. */
:root {
  --ink: #1c2530;
  --muted: #5b6b7c;
  --line: #e3e8ee;
  --bg: #ffffff;
  --soft: #f4f7f7;
  --accent: #0e7c66;
  --accent-dark: #0a5f4e;
  --accent-soft: #e2f2ee;
  --warn-bg: #fff7e6;
  --warn-ink: #7a5b00;
  --radius: 12px;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.55;
  font-size: 16px;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
header.site {
  border-bottom: 1px solid var(--line);
  background: #fff;
  position: sticky;
  top: 0;
  z-index: 10;
}
.nav {
  max-width: 960px;
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  gap: 20px;
}
.brand {
  font-weight: 800;
  font-size: 20px;
  color: var(--ink);
  letter-spacing: -0.02em;
}
.brand span { color: var(--accent); }
.nav nav { margin-left: auto; display: flex; gap: 18px; font-size: 15px; }
.nav nav a { color: var(--muted); }
.nav nav a:hover { color: var(--ink); }
main { max-width: 880px; margin: 0 auto; padding: 28px 20px 60px; }
main.wide { max-width: 960px; }
h1 { font-size: 30px; line-height: 1.2; margin: 8px 0 10px; letter-spacing: -0.02em; }
h2 { font-size: 21px; margin: 36px 0 10px; letter-spacing: -0.01em; }
h3 { font-size: 17px; margin: 22px 0 6px; }
.lede { font-size: 18px; color: var(--muted); margin: 0 0 18px; max-width: 640px; }
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--accent-soft);
  color: var(--accent-dark);
  font-weight: 600;
  font-size: 14px;
  padding: 6px 12px;
  border-radius: 999px;
  margin-bottom: 18px;
}
.note {
  background: var(--warn-bg);
  color: var(--warn-ink);
  border: 1px solid #f0dfae;
  border-radius: var(--radius);
  padding: 12px 16px;
  font-size: 14.5px;
  margin: 16px 0;
}
.note strong { color: inherit; }
.dropzone {
  border: 2px dashed #b9c6cf;
  border-radius: var(--radius);
  background: var(--soft);
  padding: 34px 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color .15s, background .15s;
}
.dropzone:hover, .dropzone.over { border-color: var(--accent); background: var(--accent-soft); }
.dropzone .big { font-size: 18px; font-weight: 700; }
.dropzone .small { color: var(--muted); font-size: 14px; margin-top: 4px; }
.filelist { margin: 16px 0 0; padding: 0; list-style: none; }
.filelist li {
  display: flex;
  align-items: center;
  gap: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 9px 12px;
  margin-bottom: 8px;
  font-size: 14.5px;
  background: #fff;
}
.filelist .name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.filelist .size { color: var(--muted); font-size: 13px; white-space: nowrap; }
.filelist button {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 6px;
  padding: 3px 9px;
  cursor: pointer;
  font-size: 13px;
  color: var(--muted);
}
.filelist button:hover { border-color: var(--accent); color: var(--accent-dark); }
.options {
  margin: 18px 0;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  display: grid;
  gap: 12px;
}
.options label { font-weight: 600; font-size: 14.5px; display: block; margin-bottom: 4px; }
.options .row { display: flex; flex-wrap: wrap; gap: 16px; align-items: center; }
.options input[type="text"], .options select {
  padding: 9px 11px;
  border: 1px solid #c6d0d8;
  border-radius: 8px;
  font-size: 15px;
  width: 100%;
  max-width: 420px;
}
.options input[type="range"] { width: 100%; max-width: 320px; }
.options .hint { color: var(--muted); font-size: 13.5px; font-weight: 400; }
button.primary {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  border: 0;
  border-radius: 10px;
  padding: 13px 26px;
  font-size: 16.5px;
  font-weight: 700;
  cursor: pointer;
  margin-top: 6px;
}
button.primary:hover:not(:disabled) { background: var(--accent-dark); }
button.primary:disabled { background: #b9c6cf; cursor: not-allowed; }
button.secondary {
  background: #fff;
  color: var(--accent-dark);
  border: 1.5px solid var(--accent);
  border-radius: 10px;
  padding: 10px 18px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
}
.status { margin-top: 14px; font-size: 15px; min-height: 24px; }
.status.ok { color: var(--accent-dark); font-weight: 600; }
.status.err { color: #b3261e; font-weight: 600; }
.result {
  margin-top: 14px;
  border: 1px solid var(--accent);
  background: var(--accent-soft);
  border-radius: var(--radius);
  padding: 16px;
}
.result .dl {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  padding: 11px 20px;
  border-radius: 9px;
  margin-top: 8px;
}
.result .dl:hover { text-decoration: none; background: var(--accent-dark); }
.thumbs { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 14px; }
.thumbs figure { margin: 0; width: 150px; }
.thumbs img { width: 100%; border: 1px solid var(--line); border-radius: 6px; display: block; }
.thumbs figcaption { font-size: 12.5px; color: var(--muted); margin-top: 4px; text-align: center; }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin: 12px 0; }
.steps div { border: 1px solid var(--line); border-radius: var(--radius); padding: 14px; background: var(--soft); }
.steps b { display: block; font-size: 15px; margin-bottom: 4px; }
.steps p { margin: 0; font-size: 14px; color: var(--muted); }
.faq details { border-top: 1px solid var(--line); padding: 12px 0; }
.faq summary { font-weight: 700; cursor: pointer; font-size: 15.5px; }
.faq p { margin: 8px 0 0; color: var(--muted); font-size: 15px; }
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin: 24px 0; }
.card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  background: #fff;
  display: flex;
  flex-direction: column;
}
.card:hover { border-color: var(--accent); }
.card h3 { margin: 0 0 6px; font-size: 18px; }
.card p { margin: 0 0 14px; color: var(--muted); font-size: 14.5px; flex: 1; }
.card a.cta { font-weight: 700; }
.hero { padding: 26px 0 6px; }
.hero h1 { font-size: 36px; }
.hero p { font-size: 18px; color: var(--muted); max-width: 640px; }
.why { background: var(--soft); border-radius: var(--radius); padding: 20px 22px; margin-top: 28px; }
.why ul { margin: 8px 0 0; padding-left: 20px; }
.why li { margin-bottom: 6px; }
footer.site {
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}
footer.site .inner { max-width: 960px; margin: 0 auto; padding: 22px 20px; display: flex; flex-wrap: wrap; gap: 8px 22px; }
footer.site a { color: var(--muted); }
.meta-table { width: 100%; border-collapse: collapse; font-size: 14.5px; margin: 10px 0; }
.meta-table th, .meta-table td { text-align: left; border-bottom: 1px solid var(--line); padding: 8px 6px; vertical-align: top; }
.meta-table th { width: 180px; color: var(--muted); font-weight: 600; }
@media (max-width: 700px) {
  h1 { font-size: 25px; }
  .hero h1 { font-size: 29px; }
  .cards { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .nav nav { gap: 12px; }
  .filelist .size { display: none; }
}