@font-face {
  font-family: "Onest";
  src: url("../assets/fonts/Onest-Regular.ttf") format("truetype");
  font-style: normal;
  font-weight: 400;
  font-display: swap;
}

@font-face {
  font-family: "Onest";
  src: url("../assets/fonts/Onest-SemiBold.ttf") format("truetype");
  font-style: normal;
  font-weight: 600;
  font-display: swap;
}

@font-face {
  font-family: "Onest";
  src: url("../assets/fonts/Onest-ExtraBold.ttf") format("truetype");
  font-style: normal;
  font-weight: 800;
  font-display: swap;
}

:root {
  --ink: #0d3036;
  --muted: #577078;
  --accent: #08b9c6;
  --accent-dark: #007b87;
  --surface: #ffffff;
  --soft: #eaf8fa;
  --line: #cfe3e6;
  --dark: #0b2f35;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: #f8fbfc;
  font-family: "Onest", Arial, sans-serif;
  font-size: 18px;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
}

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

a {
  color: var(--accent-dark);
  text-underline-offset: 3px;
}

a:hover {
  color: var(--ink);
}

.container {
  width: min(100% - 40px, 1120px);
  margin-inline: auto;
}

.guide-header {
  position: sticky;
  z-index: 10;
  top: 0;
  border-bottom: 1px solid rgba(13, 48, 54, 0.1);
  background: rgba(248, 251, 252, 0.94);
  backdrop-filter: blur(16px);
}

.guide-header .container {
  display: flex;
  min-height: 72px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.guide-header .brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  font-size: 21px;
  font-weight: 800;
  text-decoration: none;
}

.guide-header .brand img {
  width: 42px;
  height: 42px;
  border-radius: 13px;
}

.back-link {
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
}

.guide-hero {
  padding: 78px 0 68px;
  overflow: hidden;
  background:
    radial-gradient(circle at 80% 12%, rgba(8, 185, 198, 0.18), transparent 28rem),
    linear-gradient(180deg, #f8fbfc 0%, var(--soft) 100%);
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-bottom: 30px;
  color: var(--muted);
  font-size: 13px;
}

.breadcrumbs a {
  color: inherit;
}

.guide-hero h1 {
  max-width: 900px;
  margin: 0;
  font-size: clamp(2.5rem, 6vw, 5.5rem);
  font-weight: 800;
  letter-spacing: -0.055em;
  line-height: 0.98;
}

.guide-hero .lede {
  max-width: 740px;
  margin: 30px 0 0;
  color: var(--muted);
  font-size: clamp(1.08rem, 2vw, 1.35rem);
  line-height: 1.55;
}

.fact-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  max-width: 820px;
  margin-top: 44px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--line);
}

.fact-row div {
  padding: 18px 20px;
  background: rgba(255, 255, 255, 0.82);
}

.fact-row strong,
.fact-row span {
  display: block;
}

.fact-row strong {
  font-size: 15px;
}

.fact-row span {
  margin-top: 3px;
  color: var(--muted);
  font-size: 13px;
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 250px;
  gap: 80px;
  padding: 74px 0 96px;
}

.guide-content {
  max-width: 760px;
}

.guide-content h2 {
  margin: 70px 0 20px;
  font-size: clamp(1.75rem, 3vw, 2.55rem);
  letter-spacing: -0.035em;
  line-height: 1.15;
}

.guide-content h2:first-child {
  margin-top: 0;
}

.guide-content h3 {
  margin: 38px 0 12px;
  font-size: 1.2rem;
  line-height: 1.3;
}

.guide-content p,
.guide-content ul,
.guide-content ol {
  margin: 0 0 24px;
}

.guide-content li + li {
  margin-top: 9px;
}

.guide-content strong {
  font-weight: 700;
}

.note {
  margin: 34px 0;
  padding: 24px 28px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--soft);
}

.note p:last-child {
  margin-bottom: 0;
}

.guide-nav {
  position: sticky;
  top: 104px;
  align-self: start;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--surface);
}

.guide-nav strong {
  display: block;
  margin-bottom: 13px;
  font-size: 13px;
}

.guide-nav a {
  display: block;
  padding: 8px 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.4;
  text-decoration: none;
}

.guide-nav a + a {
  border-top: 1px solid var(--line);
}

.guide-cta {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 24px;
  align-items: center;
  margin-top: 72px;
  padding: 28px;
  color: #fff;
  border-radius: 24px;
  background: var(--dark);
}

.guide-cta img {
  width: 68px;
  height: 68px;
  border-radius: 20px;
}

.guide-cta strong,
.guide-cta span {
  display: block;
}

.guide-cta span {
  margin-top: 4px;
  color: #b8d0d4;
  font-size: 14px;
}

.guide-cta a {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  padding: 0 19px;
  color: var(--dark);
  border-radius: 999px;
  background: #fff;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
}

.related {
  padding: 76px 0;
  border-top: 1px solid var(--line);
  background: var(--surface);
}

.related h2 {
  margin: 0 0 28px;
  font-size: 1.7rem;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.related-card {
  padding: 26px;
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 18px;
  text-decoration: none;
}

.related-card strong,
.related-card span {
  display: block;
}

.related-card span {
  margin-top: 7px;
  color: var(--muted);
  font-size: 14px;
}

.guide-footer {
  padding: 30px 0;
  color: #a9c1c5;
  background: var(--dark);
  font-size: 13px;
}

.guide-footer .container {
  display: flex;
  justify-content: space-between;
  gap: 20px;
}

.guide-footer a {
  color: #d4e7e9;
}

@media (max-width: 820px) {
  .article-layout {
    grid-template-columns: 1fr;
    gap: 46px;
  }

  .guide-nav {
    position: static;
    grid-row: 1;
  }

  .fact-row,
  .guide-cta {
    grid-template-columns: 1fr;
  }

  .guide-cta a {
    justify-self: start;
  }
}

@media (max-width: 560px) {
  body {
    font-size: 16px;
  }

  .container {
    width: min(100% - 28px, 1120px);
  }

  .guide-hero {
    padding: 54px 0 50px;
  }

  .fact-row,
  .related-grid {
    grid-template-columns: 1fr;
  }

  .article-layout {
    padding: 54px 0 70px;
  }

  .guide-cta {
    margin-top: 54px;
  }

  .guide-footer .container {
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}