:root {
  --bg: #fdf8ef;
  --card: #ffffff;
  --ink: #1f2a2e;
  --soft: #5b6b70;
  --teal: #0aa596;
  --teal-dark: #08796e;
  --line: #e9e1d2;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #10181b;
    --card: #182327;
    --ink: #eef3f2;
    --soft: #a7b6b8;
    --teal: #2cc4b4;
    --teal-dark: #5ee0d2;
    --line: #26353a;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
main { max-width: 760px; margin: 0 auto; padding: 32px 16px 64px; }
header { display: flex; align-items: center; gap: 14px; margin-bottom: 8px; }
header img { width: 64px; height: 64px; border-radius: 15px; }
header a { color: inherit; text-decoration: none; }
h1 { font-size: 2rem; line-height: 1.2; margin: 0; }
h2 { font-size: 1.35rem; margin: 2rem 0 0.5rem; }
h3 { font-size: 1.1rem; margin: 1.4rem 0 0.3rem; }
p, li { color: var(--ink); }
.lead { color: var(--soft); font-size: 1.1rem; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 18px; padding: 20px 22px; margin: 18px 0; }
a { color: var(--teal-dark); }
nav { display: flex; flex-wrap: wrap; gap: 10px; margin: 18px 0 8px; }
nav a {
  display: inline-block; padding: 8px 16px; border-radius: 999px; background: var(--card);
  border: 1px solid var(--line); text-decoration: none; font-weight: 600; color: var(--ink);
}
nav a.on { background: var(--teal); border-color: var(--teal); color: #fff; }
.lang { font-size: 0.95rem; color: var(--soft); }
footer { margin-top: 48px; color: var(--soft); font-size: 0.9rem; border-top: 1px solid var(--line); padding-top: 16px; }
ul { padding-left: 1.2rem; }

label { display: block; font-weight: 600; margin: 14px 0 6px; }
input, select, textarea {
  width: 100%; font: inherit; color: var(--ink); background: var(--bg); border: 1px solid var(--line);
  border-radius: 12px; padding: 10px 12px;
}
textarea { resize: vertical; }
button {
  margin-top: 16px; font: inherit; font-weight: 700; color: #fff; background: var(--teal); border: none;
  border-radius: 999px; padding: 12px 28px; cursor: pointer;
}
button:disabled { opacity: 0.6; cursor: default; }
.hp { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }

hr.split { border: none; border-top: 1px solid var(--line); margin: 48px 0 8px; }
h1.sub { font-size: 1.7rem; }
fieldset.plain { border: none; padding: 0; margin: 0; }