:root {
  --blue: #0767c9;
  --blue-dark: #075da8;
  --ink: #18314f;
  --muted: #5a6675;
  --line: #d9e4f1;
  --soft: #eef5fb;
  --white: #ffffff;
  --green: #128564;
  --orange: #f06d21;
  --shadow: 0 12px 30px rgba(15, 48, 84, 0.1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 18px;
  line-height: 1.66;
}

a {
  color: var(--blue);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

img {
  display: block;
  max-width: 100%;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--white);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 3px 18px rgba(13, 50, 85, 0.08);
}

.header-inner {
  width: min(1180px, calc(100% - 32px));
  min-height: 86px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 26px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  text-decoration: none;
}

.brand-mark {
  position: relative;
  display: block;
  width: 48px;
  height: 46px;
}

.brand-mark::before {
  position: absolute;
  inset: 7px 8px 6px 5px;
  border: 4px solid var(--blue);
  border-right-color: transparent;
  border-radius: 50%;
  content: "";
  transform: rotate(-26deg);
}

.brand-mark::after {
  position: absolute;
  inset: 8px 6px 7px 8px;
  border: 4px solid #11a597;
  border-left-color: transparent;
  border-radius: 50%;
  content: "";
  transform: rotate(28deg);
}

.brand-dot {
  position: absolute;
  z-index: 1;
  display: block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
}

.dot-blue {
  left: 6px;
  bottom: 9px;
  background: var(--blue);
}

.dot-green {
  right: 3px;
  top: 13px;
  background: #11a597;
}

.dot-orange {
  left: 3px;
  top: 5px;
  background: var(--orange);
}

.brand-name {
  color: var(--blue-dark);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 42px;
  line-height: 1;
  letter-spacing: 0;
}

.primary-nav {
  display: flex;
  align-items: center;
  gap: 22px;
  margin-left: auto;
}

.primary-nav a {
  color: var(--ink);
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
}

.primary-nav a:hover {
  color: var(--blue);
}

.buy-button {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  padding: 12px 20px;
  border-radius: 6px;
  background: var(--green);
  color: var(--white);
  font-size: 15px;
  font-weight: 800;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
  box-shadow: 0 10px 20px rgba(18, 133, 100, 0.22);
}

.buy-button:hover {
  background: #0d7255;
}

.buy-button.large {
  min-height: 52px;
  padding-inline: 28px;
  font-size: 17px;
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  margin-left: auto;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--white);
  color: var(--ink);
}

.menu-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  margin: 5px auto;
  background: currentColor;
}

.article-shell {
  width: min(920px, calc(100% - 34px));
  margin: 0 auto;
  padding: 38px 0 76px;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 30px;
  color: var(--muted);
  font-size: 14px;
}

.breadcrumb a {
  color: var(--blue);
}

.article {
  margin: 0 auto;
}

.article-heading {
  text-align: center;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 14px;
  color: var(--blue-dark);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(42px, 7vw, 68px);
  line-height: 1.04;
  letter-spacing: 0;
}

.meta {
  margin-bottom: 20px;
  color: var(--muted);
  font-size: 16px;
}

.dek {
  max-width: 720px;
  margin: 0 auto 34px;
  color: #31526f;
  font-size: 24px;
  line-height: 1.38;
  font-weight: 700;
}

.hero-image {
  margin: 0 auto 44px;
  overflow: hidden;
  border-radius: 8px;
  background: var(--soft);
  box-shadow: var(--shadow);
}

.hero-image img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  object-position: center;
}

.article-body {
  width: min(720px, 100%);
  margin: 0 auto;
}

.article-body p {
  margin-bottom: 24px;
}

.article-body h2 {
  margin: 44px 0 14px;
  color: var(--blue-dark);
  font-size: 30px;
  line-height: 1.18;
  letter-spacing: 0;
}

.cta-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 26px;
  margin-top: 50px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f7fbff;
  box-shadow: var(--shadow);
}

.cta-panel h2 {
  margin: 0 0 8px;
  font-size: 26px;
}

.cta-panel p {
  margin: 0;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.5;
}

.site-footer {
  background: var(--blue);
  color: var(--white);
}

.footer-inner {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 46px 0 54px;
  text-align: center;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px 34px;
  margin-bottom: 26px;
}

.footer-links a {
  color: var(--white);
  font-size: 18px;
  font-weight: 800;
}

.footer-inner p {
  margin: 0;
  color: rgba(255, 255, 255, 0.9);
  font-size: 19px;
}

@media (max-width: 980px) {
  .header-inner {
    min-height: 76px;
    gap: 14px;
  }

  .menu-toggle {
    display: block;
  }

  .primary-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px 18px 18px;
    border-top: 1px solid var(--line);
    background: var(--white);
    box-shadow: 0 18px 24px rgba(15, 48, 84, 0.1);
  }

  .primary-nav.is-open {
    display: flex;
  }

  .primary-nav a {
    padding: 12px 0;
    border-bottom: 1px solid var(--line);
    font-size: 16px;
  }

  .header-inner > .buy-button {
    min-height: 42px;
    padding-inline: 14px;
  }
}

@media (max-width: 640px) {
  body {
    font-size: 17px;
  }

  .header-inner {
    width: min(100% - 24px, 1180px);
  }

  .brand img {
    width: 112px;
  }

  .brand {
    gap: 8px;
  }

  .brand-mark {
    width: 38px;
    height: 36px;
  }

  .brand-name {
    font-size: 31px;
  }

  .article-shell {
    width: min(100% - 26px, 920px);
    padding: 26px 0 54px;
  }

  .breadcrumb {
    margin-bottom: 22px;
    font-size: 13px;
  }

  h1 {
    font-size: 42px;
  }

  .dek {
    font-size: 20px;
  }

  .hero-image {
    margin-bottom: 32px;
  }

  .hero-image img {
    aspect-ratio: 1 / 1;
  }

  .article-body h2 {
    margin-top: 36px;
    font-size: 25px;
  }

  .cta-panel {
    align-items: stretch;
    flex-direction: column;
    padding: 22px;
  }

  .cta-panel .buy-button {
    width: 100%;
  }

  .footer-inner {
    padding: 34px 0 40px;
  }

  .footer-links {
    display: grid;
    gap: 14px;
  }

  .footer-links a,
  .footer-inner p {
    font-size: 16px;
  }
}

@media (max-width: 420px) {
  .header-inner > .buy-button {
    padding-inline: 11px;
    font-size: 13px;
  }

  .menu-toggle {
    width: 40px;
    height: 40px;
  }

  h1 {
    font-size: 36px;
  }
}