/* Base */
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Arial, sans-serif;
  line-height: 1.5;
  color: #222;
  background: #f8fafc;
}

header, footer {
  background: #123456;
  color: #fff;
  padding: 18px 24px;
}

a { color: #0b66c3; }
a:hover { text-decoration: underline; }

h1, h2, h3 {
  font-weight: 600;
  color: #123456;
  margin-top: 1.6em;
}
h1 { margin-top: 0; }

main { max-width: 960px; margin: 0 auto; padding: 24px; }

nav a { color: #fff; margin-right: 18px; text-decoration: none; font-weight: 500; }
nav a:hover { text-decoration: underline; }

section { margin-bottom: 48px; }

code { background: #eef; padding: 2px 5px; border-radius: 4px; font-size: 90%; }

/* Tables */
table { border-collapse: collapse; width: 100%; margin: 12px 0; background: #fff; }
th, td { border: 1px solid #ccd; padding: 8px; text-align: left; }
th { background: #f0f4f8; }

/* Lists */
ul.checks { list-style: none; padding-left: 0; }
ul.checks li::before { content: "✔"; color: #0a8a3a; margin-right: 6px; }

/* Blocks */
blockquote {
  margin: 12px 0;
  padding: 12px 16px;
  border-left: 4px solid #0b66c3;
  background: #f0f6ff;
}
small { color: #555; }

/* Tariff cards */
.tariff {
  display: inline-block;
  border: 1px solid #0b66c3;
  padding: 14px 18px;
  border-radius: 10px;
  background: #fff;
  box-shadow: 0 2px 4px rgba(0,0,0,.06);
  min-width: 220px;
  margin: 8px 16px 16px 0;
  vertical-align: top;
}
.tariff h3 { margin-top: 0; }

.bad { color: #b30000; font-weight: 600; }
.good { color: #0a8a3a; font-weight: 600; }

.center { text-align: center; }

/* Buttons */
.btn {
  display: inline-block;
  background: #0b66c3;
  color: #fff !important;
  padding: 10px 20px;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 600;
  margin-top: 6px;
  transition: .15s background;
}
.btn:hover { background: #094f92; }

.muted { color: #666; }

.grid { display: flex; flex-wrap: wrap; gap: 18px; }

/* Images responsive */
img { max-width: 100%; height: auto; border-radius: 6px; }

/* Utility */
.notice { background: #fff8d3; border: 1px solid #e3d27a; padding: 10px 14px; border-radius: 6px; }
/* Sticky footer */
html, body { height: 100%; }

body {
  min-height: 100dvh;      /* высота экрана */
  display: flex;
  flex-direction: column;
}

main { flex: 1 0 auto; }   /* контент растягивается */
footer { margin-top: auto; }  /* футер прижат к низу */