:root {
  --bg: #f6f7fb;
  --card: #ffffff;
  --text: #1b1f2a;
  --muted: #5d6476;
  --line: #e2e5ee;
  --brand: #0f9d58;
  --brand-dark: #0b7a44;
  --accent: #1a73e8;
  --bad: #d93025;
  --radius: 14px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1218;
    --card: #181c25;
    --text: #e8eaf0;
    --muted: #9aa1b2;
    --line: #2a303d;
    --brand: #22c374;
    --brand-dark: #1aa862;
    --accent: #6ea8ff;
    --bad: #ff6b6b;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}
a { color: var(--accent); }
header.top {
  background: var(--card);
  border-bottom: 1px solid var(--line);
}
header.top .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-top: 14px;
  padding-bottom: 14px;
  flex-wrap: wrap;
}
.logo {
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--text);
  text-decoration: none;
}
.logo span { color: var(--brand); }
nav.menu { display: flex; gap: 14px; flex-wrap: wrap; font-size: .92rem; }
nav.menu a { color: var(--muted); text-decoration: none; }
nav.menu a:hover { color: var(--brand); }
.wrap { max-width: 860px; margin: 0 auto; padding-left: 16px; padding-right: 16px; }
main { padding-top: 28px; padding-bottom: 40px; }
h1 { font-size: 1.8rem; line-height: 1.25; margin: 0 0 8px; }
h2 { font-size: 1.25rem; margin: 32px 0 8px; }
.lead { color: var(--muted); margin: 0 0 22px; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
}
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 14px; }
.tool {
  display: block;
  text-decoration: none;
  color: var(--text);
  transition: transform .15s, border-color .15s;
}
.tool:hover { transform: translateY(-2px); border-color: var(--brand); }
.tool .ico { font-size: 1.8rem; }
.tool h3 { margin: 6px 0 4px; font-size: 1.05rem; }
.tool p { margin: 0; color: var(--muted); font-size: .92rem; }
form.calc { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 14px; }
label { display: flex; flex-direction: column; gap: 4px; font-size: .9rem; font-weight: 600; }
input, select {
  font: inherit;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--bg);
  color: var(--text);
}
input:focus, select:focus { outline: 2px solid var(--brand); border-color: transparent; }
button {
  font: inherit;
  font-weight: 700;
  background: var(--brand);
  color: #fff;
  border: 0;
  border-radius: 10px;
  padding: 12px 18px;
  cursor: pointer;
  align-self: end;
}
button:hover { background: var(--brand-dark); }
.result {
  margin-top: 18px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 12px;
}
.stat {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 14px;
}
.stat small { display: block; color: var(--muted); font-size: .8rem; }
.stat strong { font-size: 1.25rem; }
.stat.main strong { color: var(--brand); }
.stat.bad strong { color: var(--bad); }
.note { font-size: .85rem; color: var(--muted); margin-top: 14px; }
.ad-slot { margin: 26px 0; min-height: 90px; }
table { width: 100%; border-collapse: collapse; font-size: .9rem; margin-top: 14px; }
th, td { padding: 8px; border-bottom: 1px solid var(--line); text-align: right; }
th:first-child, td:first-child { text-align: left; }
.table-scroll { overflow-x: auto; }
.rows .row { display: grid; grid-template-columns: 1fr 1fr auto; gap: 10px; margin-bottom: 10px; align-items: end; }
.btn-ghost { background: transparent; color: var(--muted); border: 1px solid var(--line); padding: 10px 12px; }
.btn-ghost:hover { background: var(--bg); color: var(--bad); }
.btn-sec { background: var(--accent); }
.btn-sec:hover { background: var(--accent); opacity: .9; }
footer {
  border-top: 1px solid var(--line);
  padding: 22px 0 30px;
  color: var(--muted);
  font-size: .85rem;
}
footer a { color: var(--muted); }
@media (max-width: 520px) {
  h1 { font-size: 1.45rem; }
  .card { padding: 16px; }
  .rows .row { grid-template-columns: 1fr 1fr; }
  .rows .row .btn-ghost { grid-column: span 2; }
}