:root {
  --ink: #17202a;
  --muted: #5f6f7f;
  --paper: #f6f4ef;
  --panel: #ffffff;
  --line: #d8e1e7;
  --accent: #176b87;
  --accent-2: #8a5a22;
  --soft: #eef5f6;
}

* { box-sizing: border-box; }

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.58;
}

a { color: inherit; }

.topbar {
  align-items: center;
  background: rgba(246, 244, 239, 0.96);
  border-bottom: 1px solid var(--line);
  display: flex;
  gap: 24px;
  justify-content: space-between;
  padding: 16px max(20px, calc((100vw - 1120px) / 2));
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand {
  color: var(--ink);
  font-size: 18px;
  font-weight: 800;
  text-decoration: none;
}

nav {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

nav a {
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
}

nav a[aria-current="page"],
nav a:hover { color: var(--accent); }

main {
  margin: 0 auto;
  padding: 34px 20px 72px;
  width: min(1120px, 100%);
}

.hero {
  display: grid;
  gap: 40px;
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, 0.65fr);
  min-height: 420px;
  padding: 56px 0 36px;
}

.eyebrow,
.label {
  color: var(--accent-2);
  display: block;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0;
  margin: 0 0 10px;
  text-transform: uppercase;
}

h1 {
  font-size: clamp(42px, 7vw, 84px);
  line-height: 0.95;
  margin: 0;
  max-width: 850px;
}

h2 {
  font-size: 24px;
  line-height: 1.15;
  margin: 0 0 14px;
}

.lede {
  color: var(--muted);
  font-size: 20px;
  max-width: 760px;
}

.answer-panel,
section,
.side-note {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 24px;
}

.answer-panel {
  align-self: end;
}

.answer-panel strong {
  display: block;
  font-size: 28px;
  line-height: 1.12;
}

.search-box {
  align-items: end;
  display: grid;
  gap: 10px;
  grid-template-columns: minmax(0, 1fr) auto;
  margin-top: 28px;
  max-width: 640px;
}

.search-box label {
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
  grid-column: 1 / -1;
}

input,
button {
  border: 1px solid var(--line);
  border-radius: 8px;
  font: inherit;
  min-height: 46px;
  padding: 10px 13px;
}

button {
  background: var(--ink);
  color: white;
  cursor: pointer;
  font-weight: 800;
}

.section-grid {
  display: grid;
  gap: 24px;
  grid-template-columns: minmax(0, 1fr) 320px;
  margin: 24px 0;
}

.guide-list {
  display: grid;
  gap: 10px;
}

.guide-link {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  display: block;
  padding: 18px;
  text-decoration: none;
  transition: border-color 150ms ease, transform 150ms ease;
}

.guide-link:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.guide-link span {
  display: block;
  font-size: 18px;
  font-weight: 800;
}

.guide-link small {
  color: var(--muted);
  display: block;
  margin-top: 4px;
}

.principles {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.article {
  max-width: 880px;
}

.article h1 {
  font-size: clamp(36px, 6vw, 68px);
}

.top-answer {
  background: var(--soft);
  border-left: 5px solid var(--accent);
  border-radius: 8px;
  font-size: 21px;
  margin: 24px 0;
  padding: 20px;
}

section {
  margin: 22px 0;
}

.steps {
  margin: 0;
  padding-left: 24px;
}

.steps li {
  margin: 12px 0;
}

table {
  border-collapse: collapse;
  width: 100%;
}

th,
td {
  border-bottom: 1px solid var(--line);
  padding: 12px;
  text-align: left;
  vertical-align: top;
}

th {
  color: var(--accent-2);
  font-size: 13px;
  text-transform: uppercase;
}

.warning {
  background: #fff8e8;
  border-color: #e6cb87;
}

details {
  border-top: 1px solid var(--line);
  padding: 14px 0;
}

summary {
  cursor: pointer;
  font-weight: 800;
}

.related {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.related a {
  background: var(--soft);
  border-radius: 999px;
  color: var(--accent);
  font-weight: 800;
  padding: 8px 12px;
  text-decoration: none;
}

.ad-slot {
  align-items: center;
  background: #f2f7f8;
  border: 1px dashed #8bb7c2;
  border-radius: 8px;
  color: #315864;
  display: flex;
  font-size: 12px;
  font-weight: 800;
  justify-content: center;
  margin: 22px 0;
  min-height: 120px;
  padding: 12px;
  text-align: center;
  text-transform: uppercase;
}

.ad-banner-mobile {
  min-height: 50px;
  max-width: 320px;
}

.ad-smartlink {
  background: #fff8e8;
  border: 1px solid #e2c57c;
  border-radius: 8px;
  color: #5d4213;
  display: inline-flex;
  font-weight: 800;
  margin-top: 12px;
  padding: 10px 14px;
  text-decoration: none;
}

.page-title {
  margin-top: 24px;
}

@media (max-width: 820px) {
  .topbar,
  nav {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero,
  .section-grid,
  .principles {
    grid-template-columns: 1fr;
  }

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

  .ad-banner-mobile {
    max-width: none;
  }
}