/* ==========================================================
   Radio Luv — style.css
   A ledger / almanac inspired design system for a beginner-
   friendly crypto reference site.
   ========================================================== */

:root {
  /* Colour */
  --color-bg: #F1ECDD;
  --color-bg-card: #E9E1C9;
  --color-ink: #171B16;
  --color-ink-soft: #4C5148;
  --color-ink-faint: #767a6e;
  --color-accent: #B4623A;
  --color-accent-deep: #8C4826;
  --color-teal: #1F4B43;
  --color-teal-soft: #E3E7DA;
  --color-border: #D3C9AC;
  --color-border-strong: #B7AA83;

  /* Type */
  --font-display: "Source Serif 4", Georgia, "Times New Roman", serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  /* Layout */
  --measure: 68ch;
  --radius: 3px;
  --gap: 1.5rem;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--color-teal);
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

a:hover { color: var(--color-accent-deep); }

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--color-ink);
  line-height: 1.15;
  margin: 0 0 0.6em;
  font-weight: 600;
}

h1 { font-size: clamp(2.1rem, 4vw + 1rem, 3.4rem); }
h2 { font-size: clamp(1.5rem, 2vw + 1rem, 2.1rem); }
h3 { font-size: 1.25rem; }

p { margin: 0 0 1.1em; }

.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.prose {
  max-width: var(--measure);
}

/* ---------- Skip link ---------- */
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--color-ink);
  color: var(--color-bg);
  padding: 0.6em 1em;
  z-index: 100;
}
.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

/* ---------- Header ---------- */
.site-header {
  border-bottom: 1px solid var(--color-border-strong);
  background: var(--color-bg);
  position: sticky;
  top: 0;
  z-index: 20;
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem 0;
  gap: 1rem;
}

.wordmark {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--color-ink);
}

.wordmark__mark { flex-shrink: 0; }

.wordmark__text {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.wordmark__text span {
  color: var(--color-accent-deep);
}

.main-nav__list {
  list-style: none;
  display: flex;
  gap: 2rem;
  margin: 0;
  padding: 0;
}

.main-nav__list a {
  color: var(--color-ink-soft);
  text-decoration: none;
  font-size: 0.98rem;
  font-weight: 500;
  padding: 0.3em 0;
  border-bottom: 2px solid transparent;
}

.main-nav__list a:hover,
.main-nav__list a[aria-current="page"] {
  color: var(--color-ink);
  border-bottom-color: var(--color-accent);
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius);
  padding: 0.5em 0.7em;
  cursor: pointer;
}

.nav-toggle__bar,
.nav-toggle__bar::before,
.nav-toggle__bar::after {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-ink);
  position: relative;
}
.nav-toggle__bar::before { content: ""; position: absolute; top: -6px; }
.nav-toggle__bar::after { content: ""; position: absolute; top: 6px; }

/* ---------- Hero ---------- */
.hero {
  padding: 4.5rem 0 3.5rem;
  border-bottom: 1px solid var(--color-border);
}

.hero__grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3rem;
  align-items: center;
}

.hero__eyebrow {
  font-size: 0.95rem;
  color: var(--color-accent-deep);
  font-weight: 600;
  margin-bottom: 0.8em;
}

.hero p.lede {
  font-size: 1.15rem;
  color: var(--color-ink-soft);
  max-width: 46ch;
}

.hero__actions {
  display: flex;
  gap: 1rem;
  margin-top: 1.8rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  padding: 0.75em 1.4em;
  border-radius: var(--radius);
  font-weight: 600;
  text-decoration: none;
  font-size: 0.98rem;
  border: 1px solid transparent;
}

.btn--primary {
  background: var(--color-ink);
  color: var(--color-bg);
}
.btn--primary:hover { background: var(--color-accent-deep); color: #fff; }

.btn--ghost {
  border-color: var(--color-border-strong);
  color: var(--color-ink);
}
.btn--ghost:hover { border-color: var(--color-ink); color: var(--color-ink); }

/* ---------- Ledger figure (hero illustration) ---------- */
.ledger-figure {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.ledger-figure__caption {
  margin-top: 0.9rem;
  font-size: 0.85rem;
  color: var(--color-ink-faint);
}

/* ---------- Section framing ---------- */
.section {
  padding: 3.5rem 0;
  border-bottom: 1px solid var(--color-border);
}

.section:last-of-type { border-bottom: none; }

.section__head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 2rem;
  margin-bottom: 2.2rem;
  flex-wrap: wrap;
}

.section__head p {
  color: var(--color-ink-soft);
  max-width: 48ch;
  margin: 0.4em 0 0;
}

.section__number {
  font-family: var(--font-display);
  color: var(--color-border-strong);
  font-size: 0.95rem;
}

/* ---------- Topic cluster cards ---------- */
.cluster-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
}

.cluster-card {
  background: var(--color-bg);
  padding: 2rem;
}

.cluster-card__index {
  font-family: var(--font-display);
  color: var(--color-accent-deep);
  font-size: 0.95rem;
  margin-bottom: 0.6em;
}

.cluster-card p { color: var(--color-ink-soft); margin-bottom: 0.6em; }

.cluster-card__meta {
  font-size: 0.85rem;
  color: var(--color-ink-faint);
}

/* ---------- Trust / methodology list ---------- */
.method-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--color-border);
}

.method-list li {
  display: grid;
  grid-template-columns: 3rem 1fr;
  gap: 1.5rem;
  padding: 1.4rem 0;
  border-bottom: 1px solid var(--color-border);
}

.method-list .num {
  font-family: var(--font-display);
  color: var(--color-accent);
  font-size: 1.1rem;
}

.method-list h3 { margin-bottom: 0.3em; }
.method-list p { color: var(--color-ink-soft); margin: 0; }

/* ---------- Callout ---------- */
.callout {
  background: var(--color-teal-soft);
  border-left: 3px solid var(--color-teal);
  padding: 1.4rem 1.6rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--color-ink-soft);
}

.callout strong { color: var(--color-ink); }

/* ---------- Simple pages (about/contact/legal) ---------- */
.page-head {
  padding: 3.5rem 0 2rem;
  border-bottom: 1px solid var(--color-border);
}

.page-head p.lede {
  color: var(--color-ink-soft);
  max-width: 60ch;
  font-size: 1.08rem;
}

.page-body {
  padding: 3rem 0;
}

.page-body h2 { margin-top: 1.6em; }
.page-body ul, .page-body ol { color: var(--color-ink-soft); }
.page-body li { margin-bottom: 0.5em; }

.breadcrumbs {
  font-size: 0.85rem;
  color: var(--color-ink-faint);
  margin-bottom: 1rem;
}
.breadcrumbs a { color: var(--color-ink-faint); }

/* ---------- Contact form ---------- */
.contact-form {
  display: grid;
  gap: 1.2rem;
  max-width: 44rem;
}

.field label {
  display: block;
  font-weight: 600;
  font-size: 0.92rem;
  margin-bottom: 0.4em;
}

.field input,
.field textarea {
  width: 100%;
  padding: 0.75em 0.9em;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius);
  background: #fff;
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--color-ink);
}

.field textarea { resize: vertical; min-height: 130px; }

.field input:focus,
.field textarea:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 1px;
}

.contact-direct {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius);
  padding: 1.6rem;
  margin-bottom: 2rem;
}

.contact-direct a { font-weight: 600; }

.form-note {
  font-size: 0.85rem;
  color: var(--color-ink-faint);
}

/* ---------- Latest articles (homepage) ---------- */
.article-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--color-border);
}

.article-list li {
  border-bottom: 1px solid var(--color-border);
}

.article-list a {
  display: grid;
  grid-template-columns: 6rem 1fr auto;
  gap: 1.5rem;
  align-items: baseline;
  padding: 1.3rem 0;
  text-decoration: none;
  color: var(--color-ink);
}

.article-list a:hover .article-list__title { color: var(--color-accent-deep); }

.article-list__tag {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-ink-faint);
}

.article-list__title {
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 600;
}

.article-list__meta {
  font-size: 0.85rem;
  color: var(--color-ink-faint);
  white-space: nowrap;
}

/* ---------- Article page ---------- */
.article-head {
  padding: 3rem 0 2rem;
  border-bottom: 1px solid var(--color-border);
}

.article-head__tag {
  display: inline-block;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-accent-deep);
  font-weight: 600;
  margin-bottom: 0.9em;
}

.article-head__dek {
  font-size: 1.12rem;
  color: var(--color-ink-soft);
  max-width: 56ch;
}

.article-meta {
  display: flex;
  gap: 1.2rem;
  flex-wrap: wrap;
  margin-top: 1.4rem;
  font-size: 0.87rem;
  color: var(--color-ink-faint);
}

.article-figure {
  margin: 2.2rem 0;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius);
  padding: 1.4rem;
}

.article-figure figcaption {
  margin-top: 0.7rem;
  font-size: 0.85rem;
  color: var(--color-ink-faint);
}

.article-body {
  padding: 2.5rem 0 1rem;
}

.article-body h2 { margin-top: 1.6em; }
.article-body h3 { margin-top: 1.2em; }
.article-body p, .article-body li { color: var(--color-ink-soft); }
.article-body ul, .article-body ol { padding-left: 1.3em; }
.article-body li { margin-bottom: 0.45em; }

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.6em 0;
  font-size: 0.95rem;
}
.article-body th, .article-body td {
  text-align: left;
  padding: 0.6em 0.8em;
  border-bottom: 1px solid var(--color-border);
}
.article-body th { color: var(--color-ink); font-family: var(--font-display); font-weight: 600; }

.key-takeaways {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius);
  padding: 1.5rem 1.7rem;
  margin: 2rem 0;
}
.key-takeaways h2 { margin-top: 0; font-size: 1.15rem; }
.key-takeaways ul { margin: 0; padding-left: 1.2em; }
.key-takeaways li { color: var(--color-ink-soft); }

.faq dt {
  font-family: var(--font-display);
  font-weight: 600;
  margin-top: 1.3em;
  color: var(--color-ink);
}
.faq dd {
  margin: 0.4em 0 0;
  color: var(--color-ink-soft);
}

.related {
  padding: 2.5rem 0 3.5rem;
  border-top: 1px solid var(--color-border);
}

.related h2 { font-size: 1.2rem; }

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
  margin-top: 1.2rem;
}

.related-grid a {
  display: block;
  background: var(--color-bg);
  padding: 1.3rem;
  text-decoration: none;
  color: var(--color-ink);
}

.related-grid a:hover { background: var(--color-bg-card); }

.related-grid__tag {
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--color-ink-faint);
  display: block;
  margin-bottom: 0.4em;
}

.related-grid__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.98rem;
}

@media (max-width: 860px) {
  .related-grid { grid-template-columns: 1fr; }
  .article-list a { grid-template-columns: 1fr; gap: 0.3rem; }
  .article-list__meta { order: 3; }
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--color-border-strong);
  padding: 3rem 0 2rem;
  margin-top: 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2.5rem;
}

.footer-grid h4 {
  font-family: var(--font-body);
  font-size: 0.85rem;
  text-transform: none;
  color: var(--color-ink-faint);
  margin-bottom: 0.9em;
  font-weight: 600;
}

.footer-grid ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-grid li { margin-bottom: 0.55em; }
.footer-grid a { color: var(--color-ink-soft); text-decoration: none; }
.footer-grid a:hover { color: var(--color-accent-deep); }

.footer-about p {
  color: var(--color-ink-soft);
  max-width: 38ch;
  font-size: 0.95rem;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  border-top: 1px solid var(--color-border);
  padding-top: 1.5rem;
  font-size: 0.85rem;
  color: var(--color-ink-faint);
}

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .hero__grid { grid-template-columns: 1fr; }
  .cluster-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 1.6rem; }
}

@media (max-width: 720px) {
  .main-nav { position: fixed; inset: 0 0 auto 0; top: 64px;
    background: var(--color-bg); border-bottom: 1px solid var(--color-border-strong);
    transform: translateY(-8px); opacity: 0; pointer-events: none;
    transition: opacity 0.15s ease, transform 0.15s ease; }
  .main-nav.is-open { opacity: 1; transform: translateY(0); pointer-events: auto; }
  .main-nav__list { flex-direction: column; gap: 0; padding: 0.5rem 1.5rem 1.5rem; }
  .main-nav__list a { display: block; padding: 0.8em 0; }
  .nav-toggle { display: inline-flex; align-items: center; justify-content: center; }
  .section__head { flex-direction: column; align-items: flex-start; }
  .method-list li { grid-template-columns: 2rem 1fr; }
}

@media (max-width: 520px) {
  body { font-size: 16px; }
  .hero { padding: 3rem 0 2.5rem; }
  .btn { width: 100%; justify-content: center; }
  .hero__actions { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}