:root {
  --orange: #c8102e;
  --orange-dark: #9d0c24;
  --green: #12294b;
  --green-dark: #0b1b34;
  --ink: #1d232b;
  --muted: #6a7077;
  --bg: #f6f5f1;
  --card: #ffffff;
  --line: #e8e1d6;
  --soft: #eef2f8;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  color: var(--ink);
  background: var(--bg);
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: var(--orange-dark);
}

a:hover {
  color: var(--green-dark);
}

.in {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 20px;
}

.top {
  background: var(--card);
  border-bottom: 3px solid var(--orange);
  position: sticky;
  top: 0;
  z-index: 10;
}

.top .in {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 74px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--green);
  font-size: 24px;
  font-weight: 800;
  line-height: 1;
}

.logo img {
  width: 38px;
  height: 38px;
}

.logo b {
  color: var(--orange);
}

.hero-img {
  display: block;
  width: 100%;
  max-width: 760px;
  margin: 20px 0 0;
  border-radius: 12px;
}

.menu {
  display: flex;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.menu a {
  display: block;
  padding: 8px 14px;
  border-radius: 8px;
  color: var(--ink);
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
}

.menu a:hover,
.menu a.cur {
  background: var(--soft);
  color: var(--orange-dark);
}

.menu-btn {
  display: none;
  border: 1px solid var(--line);
  background: var(--card);
  border-radius: 8px;
  padding: 8px 14px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.page {
  max-width: 1040px;
  margin: 0 auto;
  padding: 28px 20px 48px;
}

.narrow {
  max-width: 800px;
  margin: 0 auto;
}

.crumbs {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 14px;
}

.crumbs a {
  color: var(--muted);
}

.hero {
  background: linear-gradient(120deg, #12294b 0%, #1f4274 100%);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 36px 36px 32px;
  margin-bottom: 24px;
}

.hero h1 {
  margin: 0 0 12px;
  color: #fff;
  font-size: 36px;
  line-height: 1.2;
}

.hero p {
  margin: 0;
  font-size: 19px;
  color: #dbe5f5;
  max-width: 760px;
}

.hero .meta {
  color: #9fb3d3;
}

.meta {
  color: var(--muted);
  font-size: 14px;
  margin: 14px 0 0;
}

.plaque {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  background: var(--card);
  border: 1px solid var(--line);
  border-left: 6px solid var(--green);
  border-radius: 14px;
  padding: 22px 26px;
  margin: 0 0 28px;
}

.plaque h2 {
  margin: 0 0 6px;
  font-size: 22px;
}

.plaque p {
  margin: 0;
  color: #3d444b;
}

.btn {
  display: inline-block;
  background: var(--orange);
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  padding: 12px 24px;
  border-radius: 10px;
  border: 0;
  font-size: 16px;
  white-space: nowrap;
  cursor: pointer;
}

.btn:hover {
  background: var(--orange-dark);
  color: #fff;
}

.btn-green {
  background: var(--green);
}

.btn-green:hover {
  background: var(--green-dark);
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 28px 32px;
  margin-bottom: 24px;
}

.toc {
  background: var(--soft);
  border-radius: 12px;
  padding: 18px 26px;
  margin: 0 0 8px;
}

.toc h2 {
  margin: 0 0 8px;
  font-size: 18px;
}

.toc ol {
  margin: 0;
  padding-left: 22px;
  columns: 2;
  column-gap: 32px;
  font-size: 16px;
}

.toc li {
  margin: 3px 0;
  break-inside: avoid;
}

.article h2 {
  font-size: 26px;
  line-height: 1.3;
  margin: 36px 0 10px;
}

.article h3 {
  font-size: 20px;
  margin: 24px 0 6px;
}

.article p {
  margin: 0 0 14px;
}

.article ul,
.article ol {
  margin: 0 0 16px;
  padding-left: 24px;
}

.article li {
  margin: 4px 0;
}

.tip {
  background: #eef2f8;
  border-left: 4px solid var(--green);
  border-radius: 8px;
  padding: 14px 18px;
  margin: 18px 0;
}

.tip p {
  margin: 0;
}

.tbl-wrap {
  overflow-x: auto;
}

.tbl {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0 20px;
  font-size: 16px;
}

.tbl th,
.tbl td {
  border: 1px solid var(--line);
  padding: 10px 14px;
  text-align: left;
  vertical-align: top;
}

.tbl th {
  background: var(--soft);
}

.faq details {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px 18px;
  margin: 0 0 10px;
  background: #fbfcfe;
}

.faq summary {
  font-weight: 700;
  cursor: pointer;
}

.faq details p {
  margin: 10px 0 0;
}

.links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 8px;
}

.links a {
  display: block;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px 18px;
  text-decoration: none;
  color: var(--ink);
}

.links a:hover {
  border-color: var(--orange);
}

.links b {
  display: block;
  color: var(--orange-dark);
  margin-bottom: 4px;
}

.spec {
  width: 100%;
  border-collapse: collapse;
  margin: 12px 0 20px;
}

.spec th,
.spec td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
}

.spec th {
  width: 38%;
  color: var(--muted);
  font-weight: 600;
}

.calc {
  background: var(--soft);
  border-radius: 12px;
  padding: 18px 22px;
  margin: 18px 0;
}

.calc label {
  display: block;
  font-weight: 600;
  margin-bottom: 8px;
}

.calc input {
  font: inherit;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  width: 160px;
}

.calc .res {
  margin: 12px 0 0;
  font-weight: 700;
}

.foot {
  background: #0f1f3a;
  color: #cfd4d9;
  font-size: 15px;
}

.foot .in {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 32px;
  padding-top: 32px;
  padding-bottom: 20px;
}

.foot p {
  margin: 0 0 8px;
}

.foot a {
  color: #ffb3be;
}

.foot ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.foot li {
  margin: 4px 0;
}

.foot .cp {
  grid-column: 1 / -1;
  border-top: 1px solid #454c54;
  padding-top: 14px;
  font-size: 14px;
  color: #98a0a8;
}

@media (max-width: 760px) {
  body {
    font-size: 16px;
  }

  .top .in {
    flex-wrap: wrap;
    padding-top: 10px;
    padding-bottom: 10px;
  }

  .logo {
    font-size: 21px;
  }

  .menu-btn {
    display: block;
  }

  .menu {
    display: none;
    flex-direction: column;
    width: 100%;
  }

  .menu.open {
    display: flex;
  }

  .hero {
    padding: 24px 20px;
  }

  .hero h1 {
    font-size: 27px;
  }

  .hero p {
    font-size: 17px;
  }

  .plaque {
    flex-direction: column;
    align-items: flex-start;
  }

  .card {
    padding: 20px 18px;
  }

  .toc ol {
    columns: 1;
  }

  .tbl {
    min-width: 640px;
  }

  .article h2 {
    font-size: 22px;
  }

  .links {
    grid-template-columns: 1fr;
  }

  .foot .in {
    grid-template-columns: 1fr;
  }

  .spec th {
    width: 45%;
  }
}