:root {
  --bg: #071525;
  --card: #102844;
  --line: rgba(94, 234, 212, .2);
  --text: #e8eef7;
  --muted: #9bb0c9;
  --accent: #5eead4;
  --accent-2: #22d3ee;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 20px;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.7 "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.site-header {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border-bottom: 1px solid var(--line);
}
.brand { color: #fff; font-weight: 700; letter-spacing: .04em; }
.brand small { color: var(--muted); font-weight: 400; }
nav { display: flex; gap: 18px; font-size: 14px; }
.hero { padding: 70px 0 38px; }
.kicker { margin: 0; color: var(--accent); letter-spacing: .12em; font-size: 13px; }
h1 { margin: 10px 0; font-size: clamp(32px, 5vw, 48px); line-height: 1.2; }
h2 { margin: 0 0 8px; font-size: 22px; }
.hero p, .panel > p, aside > p, .cards p { color: var(--muted); }
.panel, .cards article {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--card);
  padding: 26px;
}
.grid, .cards { display: grid; grid-template-columns: 1.15fr .85fr; gap: 22px; margin-top: 22px; }
form { display: grid; gap: 14px; }
label { display: grid; gap: 6px; font-size: 14px; }
.domain-row {
  display: flex;
  align-items: center;
  gap: 8px;
}
.domain-row input { flex: 1; }
.suffix { color: var(--accent); font-weight: 600; white-space: nowrap; }
select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--text);
  background: rgba(7, 21, 37, .7);
  font: inherit;
}
input, textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--text);
  background: rgba(7, 21, 37, .7);
  font: inherit;
}
textarea { min-height: 88px; resize: vertical; }
button, .download {
  width: fit-content;
  border: 0;
  border-radius: 999px;
  padding: 10px 18px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  color: #06202b;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}
button.secondary { border: 1px solid var(--line); background: transparent; color: var(--text); }
.message, .result { margin: 0; color: var(--muted); }
.message.error { color: #fca5a5; }
.result { margin-top: 16px; padding: 14px; border-radius: 10px; background: rgba(7, 21, 37, .55); }
.download { display: inline-block; margin-top: 8px; }
.cards { grid-template-columns: 1fr 1fr; margin: 22px 0 50px; }
footer { padding: 24px 0 36px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }

@media (max-width: 700px) {
  body { padding: 0 14px; }
  .site-header, .grid, .cards { grid-template-columns: 1fr; }
  .site-header { padding: 14px 0; }
  nav { gap: 10px; flex-wrap: wrap; }
  .hero { padding-top: 46px; }
}