:root {
  --bg: #f5f7fb;
  --panel: #ffffff;
  --text: #142136;
  --muted: #5b6b84;
  --brand: #0f62fe;
  --brand-dark: #0b4ccc;
  --line: #dbe3f0;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, #f7f9fd 0%, #eef3fb 100%);
}
.container { width: min(1080px, 92%); margin: 0 auto; }
header {
  position: sticky; top: 0; z-index: 20;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav { display: flex; align-items: center; justify-content: space-between; min-height: 68px; gap: 20px; }
.brand { display:flex; align-items:center; gap:10px; font-weight: 700; font-size: 1.1rem; color: var(--text); text-decoration: none; }
.brand img { object-fit: contain; }
nav { display:flex; align-items:center; gap:8px; }
nav a, .blog-toggle {
  color: var(--text); text-decoration: none;
  padding: 8px 10px; border-radius: 8px; border: 0; background: transparent; cursor: pointer;
  font: inherit;
}
nav a:hover, nav a.active, .blog-toggle:hover { background: #e8f0ff; color: var(--brand-dark); }
.blog-menu { position: relative; }
.blog-dropdown {
  position: absolute;
  right: 0;
  top: 44px;
  width: 320px;
  max-height: 340px;
  overflow: auto;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: 0 10px 24px rgba(20,33,54,.12);
  padding: 8px;
  display: none;
}
.blog-dropdown.open { display: block; }
.blog-dropdown a {
  display:block;
  margin: 0;
  border-radius: 8px;
}
.hero { padding: 64px 0 34px; }
.hero h1 { margin: 0 0 12px; font-size: clamp(1.7rem, 4vw, 2.5rem); }
.hero p { margin: 0 0 18px; color: var(--muted); max-width: 760px; }
.btn { display: inline-block; background: var(--brand); color: #fff; text-decoration: none; border-radius: 10px; padding: 11px 16px; font-weight: 600; }
.btn:hover { background: var(--brand-dark); }
.section { margin: 22px 0 30px; }
.section h2 { margin: 0 0 14px; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 16px; }
.card h3 { margin: 0 0 8px; }
.card p { margin: 0 0 8px; color: var(--muted); }
.card a { color: var(--brand-dark); text-decoration: none; font-weight: 600; }
.article-cover {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: 10px;
  border: 1px solid var(--line);
  margin-bottom: 10px;
  display: block;
}
.article-hero {
  width: 100%;
  max-height: 420px;
  object-fit: cover;
  border-radius: 14px;
  border: 1px solid var(--line);
  display: block;
}
.article-wrap { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 20px; }
.article-wrap p { line-height: 1.7; color: #243246; }
.article-wrap h1 { margin-top: 0; }
.article-wrap h3 {
  margin: 18px 0 10px;
  font-size: 1.05rem;
  color: #16345e;
}
.article-inline-cover {
  float: right;
  width: min(32%, 280px);
  margin: 0 0 12px 16px;
}
.article-inline-cover img {
  width: 100%;
  display: block;
  border-radius: 12px;
  border: 1px solid var(--line);
}
.kw-list { display: flex; flex-wrap: wrap; gap: 8px; }
.kw-hits p { margin: 8px 0; color: #243246; }
.kw-chip { display: inline-block; padding: 6px 10px; border-radius: 999px; font-size: 12px; font-weight: 600; }
.kw1 { background: #eaf2ff; color: #1f4fa8; }
.kw2 { background: #e8fbef; color: #1c7b43; }
.kw3 { background: #fff3e6; color: #b05b00; }
.kw4 { background: #f5edff; color: #6d3bb8; }
.plain {
  list-style: none;
  margin: 0 0 14px;
  padding: 0;
  display: grid;
  gap: 8px;
}
.plain li { margin: 0; }
.plain a {
  display: block;
  background: #f8fbff;
  border: 1px solid #dbe6f5;
  border-radius: 10px;
  padding: 9px 12px;
  color: #21466f;
  text-decoration: none;
  font-weight: 600;
  transition: background-color .2s ease, border-color .2s ease, transform .15s ease;
}
.plain a:hover {
  background: #e9f1ff;
  border-color: #b9cff1;
  transform: translateY(-1px);
}
.back-link {
  display: inline-block;
  padding: 9px 13px;
  border-radius: 10px;
  border: 1px solid #c8d8f3;
  background: #eef4ff;
  color: #1f4fa8 !important;
  text-decoration: none;
  font-weight: 700;
}
.back-link:hover {
  background: #e3edff;
  border-color: #a9c3eb;
}
.calc-form { display: grid; gap: 10px; }
.calc-form label { font-weight: 600; }
.calc-form input { padding: 10px; border: 1px solid var(--line); border-radius: 8px; }
.calc-result { margin-top: 10px; font-weight: 700; }
footer { margin-top: 40px; border-top: 1px solid var(--line); padding: 20px 0; color: var(--muted); }
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.footer-copy { color: #5a6e8a; }
.footer-links {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.footer-links a {
  display: inline-block;
  padding: 7px 11px;
  border: 1px solid #d7e3f4;
  border-radius: 999px;
  background: #fff;
  color: #21466f;
  text-decoration: none;
  font-weight: 600;
}
.footer-links a:hover {
  background: #eaf1ff;
  border-color: #bcd0ef;
}
@media (max-width: 700px) {
  .nav { flex-wrap: wrap; padding: 8px 0; }
  nav { width: 100%; flex-wrap: wrap; }
  .grid { grid-template-columns: 1fr; }
  .blog-dropdown { left: 0; right: auto; width: 100%; }
  .article-inline-cover {
    float: none;
    width: 100%;
    margin: 0 0 12px 0;
  }
  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}




.section .grid.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)) !important; }
@media (max-width: 700px) { .grid-3 { grid-template-columns: 1fr; } }