:root {
  --bg1:#f6f7fb; --bg2:#eef0fa; --bg3:#e9eefb;
  --card:#ffffff;
  --border: rgba(20,22,40,0.10);
  --text:#1b1d2a; --muted:#5d6480;
  --accent:#6c5ce7; --accent2:#4f7df0;
  --link:#5a4fd6;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: linear-gradient(160deg, var(--bg1), var(--bg2) 45%, var(--bg3));
  min-height: 100vh; line-height: 1.6;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 28px 20px 80px; }
header.site { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; padding: 6px 0 18px; }
.brand { display: flex; align-items: center; gap: 12px; font-weight: 700; font-size: 18px; text-decoration: none; color: var(--text); }
.brand .dot { width: 36px; height: 36px; border-radius: 10px; object-fit: cover; box-shadow: 0 4px 14px rgba(20,22,40,.18); }
nav a { color: var(--muted); text-decoration: none; margin-left: 16px; font-size: 14px; }
nav a:hover { color: var(--text); }
.langs button { background: #fff; border: 1px solid var(--border); color: var(--muted); border-radius: 8px; padding: 4px 10px; margin-left: 6px; cursor: pointer; font-size: 13px; }
.langs button.active { color: var(--accent); border-color: var(--accent); background: rgba(108,92,231,.10); }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 20px; padding: 28px; margin-top: 20px; box-shadow: 0 12px 40px rgba(20,22,40,.06); }
h1 { font-size: 30px; margin: 8px 0 6px; line-height: 1.2; }
h2 { font-size: 20px; margin: 26px 0 8px; }
.muted { color: var(--muted); }
.hero h1 { font-size: 34px; }
a.btn, button.btn { display: inline-block; background: linear-gradient(135deg, var(--accent), var(--accent2)); color: #fff; border: none; border-radius: 12px; padding: 12px 18px; font-weight: 600; text-decoration: none; cursor: pointer; font-size: 15px; box-shadow: 0 8px 20px rgba(108,92,231,.28); }
a.btn:hover, button.btn:hover { opacity: .92; }
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 18px; }
@media (max-width: 560px) { .grid { grid-template-columns: 1fr; } }
.tile { display: block; background: #fbfbff; border: 1px solid var(--border); border-radius: 16px; padding: 20px; text-decoration: none; color: var(--text); transition: border-color .15s, box-shadow .15s; }
.tile:hover { border-color: var(--accent); box-shadow: 0 8px 24px rgba(108,92,231,.12); }
.tile h3 { margin: 0 0 6px; font-size: 17px; }
.tile p { margin: 0; color: var(--muted); font-size: 14px; }
label { display: block; font-size: 14px; color: var(--muted); margin: 14px 0 6px; }
input, textarea { width: 100%; background: #fff; border: 1px solid var(--border); border-radius: 12px; color: var(--text); padding: 12px 14px; font-size: 15px; font-family: inherit; }
input:focus, textarea:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(108,92,231,.15); }
textarea { min-height: 150px; resize: vertical; }
.row { margin-top: 18px; }
ul { padding-left: 20px; }
li { margin: 6px 0; }
a { color: var(--link); }
code { background: #eef0f7; padding: 2px 6px; border-radius: 6px; font-size: 13px; }
footer { margin-top: 40px; color: var(--muted); font-size: 13px; text-align: center; }
hr { border: none; border-top: 1px solid var(--border); margin: 24px 0; }
#form-status { margin-top: 14px; font-size: 14px; }
#form-status.ok { color: #1a8f4c; }
#form-status.err { color: #d23b4e; }
/* language switching */
[data-lang="ru"] .en { display: none; }
[data-lang="en"] .ru { display: none; }