:root {
  color-scheme: light;
  --bg: #f6f8f5;
  --ink: #142022;
  --muted: #5a6768;
  --line: #d8dfdc;
  --surface: #ffffff;
  --surface-2: #eef3f1;
  --accent: #0f766e;
  --accent-dark: #0b4f4a;
  --warning: #a35b00;
  --shadow: 0 16px 48px rgba(20, 32, 34, 0.08);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  overflow-x: hidden;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -48px;
  z-index: 20;
  padding: 8px 12px;
  border-radius: 6px;
  background: var(--accent-dark);
  color: #fff;
  transition: top 0.15s ease;
}

.skip-link:focus {
  top: 12px;
}

a {
  color: var(--accent-dark);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid rgba(216, 223, 220, 0.9);
  background: rgba(246, 248, 245, 0.9);
  backdrop-filter: blur(14px);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  width: calc(100% - 32px);
  max-width: 1120px;
  margin: 0 auto;
  min-height: 64px;
}

.brand {
  display: inline-flex;
  flex-direction: column;
  color: var(--ink);
  text-decoration: none;
}

.brand strong {
  font-size: 17px;
  line-height: 1.1;
}

.brand span {
  color: var(--muted);
  font-size: 12px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 14px;
}

.nav-links a {
  color: var(--ink);
  text-decoration: none;
}

.breadcrumb {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 14px;
}

.breadcrumb a {
  color: var(--muted);
  text-decoration: none;
}

.hero {
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(90deg, rgba(246, 248, 245, 0.94), rgba(246, 248, 245, 0.72), rgba(246, 248, 245, 0.46)),
    url("assets/k2-mountain.jpg") center/cover;
}

.hero-inner {
  width: calc(100% - 32px);
  max-width: 1120px;
  margin: 0 auto;
  min-height: min(72vh, 720px);
  display: grid;
  align-items: center;
  padding: 64px 0 88px;
}

.hero-copy {
  width: 100%;
  max-width: 690px;
  min-width: 0;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent-dark);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  line-height: 1.16;
  letter-spacing: 0;
}

h1 {
  margin: 0;
  font-size: clamp(42px, 7vw, 78px);
  max-width: 10ch;
}

.page h1 {
  max-width: 900px;
  font-size: clamp(34px, 5vw, 58px);
}

h2 {
  margin: 0 0 16px;
  font-size: clamp(26px, 3vw, 36px);
}

h3 {
  margin: 0 0 8px;
  font-size: 20px;
}

p {
  margin: 0 0 16px;
}

.lede {
  max-width: 680px;
  margin-top: 22px;
  color: #253335;
  font-size: 20px;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  max-width: 100%;
  min-height: 44px;
  padding: 10px 16px;
  border: 1px solid var(--accent-dark);
  border-radius: 6px;
  background: var(--accent-dark);
  color: #fff;
  font-weight: 750;
  text-align: center;
  text-decoration: none;
}

.button.secondary {
  background: rgba(255, 255, 255, 0.74);
  color: var(--accent-dark);
}

main {
  width: calc(100% - 32px);
  max-width: 1120px;
  margin: 0 auto;
}

.section {
  padding: 56px 0;
}

.page {
  padding: 56px 0 72px;
}

.content {
  width: 100%;
  max-width: 820px;
  min-width: 0;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.cluster-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.cluster {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.cluster h3 {
  margin-bottom: 14px;
}

.cluster ul {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.cluster a {
  font-weight: 750;
}

.guide-card {
  min-height: 210px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.guide-card a {
  font-weight: 800;
}

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

.mini-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 18px 0 26px;
}

.mini-panel {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.mini-panel strong {
  display: block;
  margin-bottom: 6px;
}

.checklist {
  display: grid;
  gap: 10px;
  margin: 20px 0 28px;
}

.check-item {
  display: grid;
  grid-template-columns: 24px 1fr;
  gap: 10px;
  align-items: start;
  padding: 13px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.check-item input {
  width: 18px;
  height: 18px;
  margin-top: 3px;
  accent-color: var(--accent-dark);
}

.score-box {
  margin: 18px 0 26px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-2);
}

.note,
.warning {
  padding: 18px 20px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--surface-2);
}

.warning {
  border-color: #e7c58d;
  background: #fff7e9;
  color: #4e3207;
}

.table-wrap {
  overflow-x: auto;
  margin: 20px 0 28px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

table {
  width: 100%;
  min-width: 680px;
  border-collapse: collapse;
  font-size: 15px;
}

th,
td {
  padding: 13px 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  background: #edf4f2;
  font-size: 13px;
  text-transform: uppercase;
}

tr:last-child td {
  border-bottom: 0;
}

.status {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 2px 9px;
  border-radius: 999px;
  background: #fff1d6;
  color: var(--warning);
  font-size: 13px;
  font-weight: 800;
}

.article-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.article-nav a {
  padding: 8px 11px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
  text-decoration: none;
}

.footer {
  border-top: 1px solid var(--line);
  margin-top: 36px;
  padding: 28px 0 40px;
  color: var(--muted);
  font-size: 14px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 24px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  justify-content: flex-end;
}

.footer-links a {
  color: var(--muted);
  text-decoration: none;
}

@media (max-width: 760px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
    padding: 12px 0;
  }

  .nav-links {
    width: 100%;
    gap: 12px;
    overflow-x: auto;
    padding-bottom: 2px;
  }

  .hero {
    background:
      linear-gradient(180deg, rgba(246, 248, 245, 0.94), rgba(246, 248, 245, 0.8)),
      url("assets/k2-mountain.jpg") 56% center/cover;
  }

  .hero-inner {
    min-height: 640px;
    padding: 52px 0 72px;
  }

  .hero-copy {
    max-width: 360px;
  }

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

  .button {
    width: auto;
  }

  .lede {
    font-size: 18px;
  }

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

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

  .mini-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-links {
    justify-content: flex-start;
  }
}