:root {
  --ink: #0b0f0d;
  --deep: #11302a;
  --teal: #1b6f6a;
  --sea: #2e8c84;
  --sand: #f4efe5;
  --line: rgba(17, 48, 42, 0.14);
  --muted: rgba(11, 15, 13, 0.68);
  --shadow: 0 18px 40px rgba(11, 15, 13, 0.1);
  --radius-lg: 22px;
  --radius-md: 14px;
  --radius-sm: 10px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  font-family: "Space Grotesk", "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 8% -6%, rgba(122, 191, 173, 0.2), transparent 34%),
    radial-gradient(circle at 92% 7%, rgba(199, 225, 215, 0.28), transparent 34%),
    var(--sand);
}

.guide-page {
  max-width: 1320px;
  margin: 0 auto;
  padding: 26px 24px 46px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-bottom: 22px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--ink);
  font-family: "Fraunces", "Times New Roman", serif;
  font-size: 1.35rem;
  font-weight: 600;
}

.brand img {
  border-radius: 10px;
}

.top-links {
  display: inline-flex;
  gap: 10px;
  flex-wrap: wrap;
}

.top-links a {
  text-decoration: none;
  color: rgba(11, 15, 13, 0.78);
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 0.9rem;
}

.top-links a:hover {
  border-color: rgba(17, 48, 42, 0.2);
  background: rgba(255, 255, 255, 0.72);
}

.layout {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
}

.card {
  background: rgba(255, 255, 255, 0.88);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.toc {
  position: sticky;
  top: 16px;
  padding: 14px;
  display: grid;
  gap: 8px;
}

.toc-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: rgba(17, 48, 42, 0.62);
  font-weight: 700;
  margin-bottom: 2px;
}

.toc a {
  text-decoration: none;
  color: rgba(11, 15, 13, 0.86);
  font-size: 0.9rem;
  border-radius: 8px;
  padding: 7px 8px;
}

.toc a:hover {
  background: rgba(27, 111, 106, 0.08);
}

.content {
  display: grid;
  gap: 14px;
}

.hero {
  padding: 24px;
}

.eyebrow {
  display: inline-flex;
  border: 1px solid rgba(27, 111, 106, 0.25);
  background: rgba(27, 111, 106, 0.08);
  color: var(--teal);
  border-radius: 999px;
  padding: 6px 11px;
  font-size: 0.74rem;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  font-weight: 700;
  margin-bottom: 10px;
}

.hero h1 {
  font-family: "Fraunces", "Times New Roman", serif;
  font-size: clamp(1.85rem, 4.6vw, 2.9rem);
  line-height: 1.06;
  margin-bottom: 10px;
}

.lead {
  line-height: 1.62;
  color: var(--muted);
  font-size: 1.04rem;
  max-width: 900px;
}

.hero-actions {
  margin-top: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.primary-link,
.ghost-link {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 10px 16px;
  font-weight: 600;
}

.primary-link {
  background: var(--teal);
  color: #fff;
}

.primary-link:hover {
  background: #165b56;
}

.ghost-link {
  border: 1px solid rgba(17, 48, 42, 0.2);
  color: var(--deep);
  background: rgba(255, 255, 255, 0.76);
}

.ghost-link:hover {
  border-color: rgba(27, 111, 106, 0.46);
}

.notice {
  margin-top: 14px;
  border: 1px solid rgba(182, 139, 43, 0.28);
  background: rgba(255, 247, 232, 0.86);
  color: rgba(80, 61, 19, 0.92);
  border-radius: 10px;
  padding: 10px 12px;
  line-height: 1.5;
  font-size: 0.9rem;
}

.content > .card {
  padding: 20px;
}

h2 {
  font-family: "Fraunces", "Times New Roman", serif;
  font-size: 1.45rem;
  margin-bottom: 8px;
}

h3 {
  font-size: 1rem;
  margin-bottom: 6px;
}

p {
  line-height: 1.6;
  color: rgba(11, 15, 13, 0.8);
}

code {
  background: rgba(17, 48, 42, 0.08);
  border: 1px solid rgba(17, 48, 42, 0.14);
  border-radius: 6px;
  padding: 1px 5px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 0.86em;
}

.two-col,
.glossary-grid,
.calc-map {
  margin-top: 12px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.glossary-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.two-col article,
.glossary-grid article,
.calc-map article {
  border: 1px solid rgba(17, 48, 42, 0.12);
  border-radius: var(--radius-md);
  padding: 12px;
  background: rgba(255, 255, 255, 0.86);
}

.steps,
.checklist {
  margin: 10px 0 0 18px;
  display: grid;
  gap: 8px;
  line-height: 1.55;
  color: rgba(11, 15, 13, 0.84);
}

.small-note {
  margin-top: 8px;
  font-size: 0.86rem;
  color: rgba(11, 15, 13, 0.62);
}

ul {
  margin-left: 18px;
  display: grid;
  gap: 6px;
}

#calculator .primary-link {
  margin-top: 12px;
}

#safety .notice {
  margin-top: 12px;
}

#safety .notice a {
  color: #4f3b12;
}

.page-footer {
  margin-top: 12px;
  color: rgba(11, 15, 13, 0.68);
  font-size: 0.9rem;
}

.page-footer a {
  color: rgba(11, 15, 13, 0.82);
  text-underline-offset: 2px;
}

@media (max-width: 1100px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .toc {
    position: static;
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 860px) {
  .glossary-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .two-col,
  .calc-map,
  .toc {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 620px) {
  .guide-page {
    padding: 14px;
  }

  .topbar {
    flex-direction: column;
    align-items: flex-start;
    margin-bottom: 18px;
  }

  .top-links {
    width: 100%;
  }

  .hero,
  .content > .card {
    padding: 16px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

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