:root {
  --bg: #f4f6f8;
  --card: #fff;
  --ink: #142033;
  --muted: #5b677a;
  --line: #d7dde6;
  --accent: #0b5fff;
  --ok: #0f7a3a;
  --err: #b42318;
  --font: "Segoe UI", system-ui, sans-serif;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: linear-gradient(180deg, #eef3f9 0%, var(--bg) 220px);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 14px 20px;
  background: #0f1b2d;
  color: #fff;
}
.brand { color: #fff; font-weight: 700; letter-spacing: 0.02em; font-size: 1.1rem; }
.top nav { display: flex; gap: 14px; flex-wrap: wrap; }
.top nav a { color: #dbe7ff; font-size: 0.95rem; }
.wrap { width: min(1040px, calc(100% - 32px)); margin: 24px auto; flex: 1; }
.foot {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding: 16px 20px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
  background: #fff;
}
.hero {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 36px 28px;
  margin-bottom: 20px;
}
.hero h1 { margin: 0 0 10px; font-size: clamp(1.8rem, 4vw, 2.6rem); line-height: 1.15; }
.hero p { margin: 0 0 18px; color: var(--muted); max-width: 42rem; font-size: 1.05rem; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 18px;
  margin-bottom: 16px;
}
.grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
h1, h2 { margin-top: 0; }
.muted { color: var(--muted); }
.btn {
  display: inline-block;
  border: 1px solid var(--line);
  background: #f0f3f7;
  color: var(--ink);
  padding: 9px 14px;
  border-radius: 8px;
  font-weight: 600;
}
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-block { display: block; width: 100%; text-align: center; }
label { display: block; font-size: 0.9rem; font-weight: 600; margin: 10px 0 6px; }
input, select, textarea {
  width: 100%;
  padding: 9px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font: inherit;
}
table { width: 100%; border-collapse: collapse; font-size: 0.95rem; }
th, td { border-bottom: 1px solid var(--line); padding: 8px 6px; text-align: left; vertical-align: top; }
th { color: var(--muted); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.03em; }
.flash { padding: 10px 12px; border-radius: 8px; margin-bottom: 12px; border: 1px solid var(--line); }
.flash-ok { background: #eaf7ef; border-color: #b7e0c4; color: var(--ok); }
.flash-error { background: #fdeceb; border-color: #f0b6b0; color: var(--err); }
.code-box {
  font-family: ui-monospace, Consolas, monospace;
  background: #0f1b2d;
  color: #dff7ff;
  padding: 14px;
  border-radius: 8px;
  letter-spacing: 0.06em;
  font-size: 1.1rem;
}
.pill {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  background: #eef3fb;
  border: 1px solid var(--line);
  font-size: 0.8rem;
}
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.stack > * + * { margin-top: 10px; }