:root {
  --bg: #f7f8fa;
  --card: #ffffff;
  --ink: #1d2230;
  --muted: #5d6475;
  --line: #dfe3ea;
  --accent: #2f6fde;
  --accent-ink: #ffffff;
  --ok: #1f8a4c;
  --err: #b42318;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12151b; --card: #1a1e26; --ink: #e8eaf0; --muted: #9aa1b2; --line: #2b313d;
    --accent: #5b8ff0; --accent-ink: #0d1117; --ok: #4fc483; --err: #f0857b;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
.wrap { max-width: 880px; margin: 0 auto; padding: 0 16px; }
.top { border-bottom: 1px solid var(--line); background: var(--card); }
.top .wrap { display: flex; align-items: center; justify-content: space-between; gap: 12px; height: 56px; }
.brand { display: flex; align-items: center; gap: 8px; color: var(--ink); font-weight: 650; text-decoration: none; }
.tag { color: var(--muted); font-size: .875rem; }
.intro h1 { font-size: 1.75rem; line-height: 1.25; margin: 40px 0 8px; }
.intro p { color: var(--muted); margin: 0 0 24px; max-width: 40em; }
.tool { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 20px; }
.drop {
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 4px;
  min-height: 150px; border: 2px dashed var(--line); border-radius: 10px; cursor: pointer;
  text-align: center; padding: 16px; transition: border-color .15s, background .15s;
}
.drop span { color: var(--muted); font-size: .9rem; }
.drop.over, .drop:hover { border-color: var(--accent); }
.drop input { position: absolute; width: 1px; height: 1px; opacity: 0; }
.controls { display: flex; flex-wrap: wrap; align-items: end; gap: 16px; margin-top: 16px; }
.controls label { display: flex; flex-direction: column; gap: 4px; font-size: .875rem; color: var(--muted); }
select, input[type=number] {
  font: inherit; color: var(--ink); background: var(--bg); border: 1px solid var(--line);
  border-radius: 8px; padding: 6px 10px; min-width: 120px;
}
input[type=range] { width: 160px; accent-color: var(--accent); }
button {
  font: inherit; font-weight: 600; background: var(--accent); color: var(--accent-ink); border: 0;
  border-radius: 8px; padding: 9px 22px; cursor: pointer; margin-left: auto;
}
button:disabled { opacity: .45; cursor: default; }
.results { list-style: none; margin: 16px 0 0; padding: 0; }
.results li {
  display: grid; grid-template-columns: minmax(0, 1fr) auto auto; gap: 12px; align-items: center;
  padding: 10px 0; border-top: 1px solid var(--line); font-size: .9rem;
}
.results .name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.results .meta { color: var(--muted); }
.results li.err .meta { color: var(--err); }
.results a { color: var(--accent); font-weight: 600; text-decoration: none; }
.total { margin: 12px 0 0; color: var(--ok); font-weight: 600; }
.note { color: var(--err); margin: 12px 0 0; }
.faq { margin: 40px 0; }
.faq h2 { font-size: 1.2rem; }
.faq h3 { font-size: 1rem; margin: 20px 0 4px; }
.faq p { margin: 0; color: var(--muted); max-width: 44em; }
.foot { color: var(--muted); font-size: .85rem; border-top: 1px solid var(--line); padding-top: 16px; padding-bottom: 32px; }
@media (max-width: 560px) {
  .tag { display: none; }
  .results li { grid-template-columns: 1fr auto; }
  .results .meta { grid-column: 1 / -1; grid-row: 2; }
  button { margin-left: 0; width: 100%; }
}