/* ---------- Tokens ---------- */
:root {
  color-scheme: light dark;

  /* Light palette: sea + sand */
  --color-bg: #fdfbf6;
  --color-surface: #ffffff;
  --color-surface-alt: #f4efe6;
  --color-text: #1a2a33;
  --color-muted: #5a6b73;
  --color-accent: #0f6e8c;       /* deep Atlantic */
  --color-accent-hover: #0a566e;
  --color-warm: #d97742;         /* terracotta / sardine grill */
  --color-border: #e3dccc;
  --color-shadow: 30 60 80;      /* rgb tuple for shadows */

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;

  --shadow-sm: 0 1px 2px rgb(var(--color-shadow) / 0.06);
  --shadow-md: 0 4px 14px rgb(var(--color-shadow) / 0.08);
  --shadow-lg: 0 12px 32px rgb(var(--color-shadow) / 0.12);

  --container: 72rem;

  --font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI",
    Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-display: "Georgia", "Iowan Old Style", "Times New Roman", serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0d1820;
    --color-surface: #14232c;
    --color-surface-alt: #1b2e39;
    --color-text: #e6ecef;
    --color-muted: #95a6ae;
    --color-accent: #5ec2dc;
    --color-accent-hover: #84d6eb;
    --color-warm: #e89466;
    --color-border: #25404e;
    --color-shadow: 0 0 0;
  }
}

/* ---------- Reset-ish ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.55;
  background: var(--color-bg);
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.2;
  margin: 0 0 0.5em;
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(2rem, 4vw + 1rem, 3.25rem); }
h2 { font-size: clamp(1.5rem, 1.5vw + 1rem, 2.1rem); }
h3 { font-size: 1.2rem; }

p { margin: 0 0 1rem; }

a {
  color: var(--color-accent);
  text-decoration: none;
}
a:hover,
a:focus-visible { color: var(--color-accent-hover); text-decoration: underline; }

:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 4px;
}

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

/* ---------- Layout primitives ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 1.25rem;
}

.section {
  padding-block: clamp(2.5rem, 4vw, 4.5rem);
}

.section--alt { background: var(--color-surface-alt); }

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-warm);
  margin: 0 0 0.5rem;
}

/* ---------- Skip link ---------- */
.skip-link {
  position: absolute;
  left: 0;
  top: -40px;
  background: var(--color-accent);
  color: #fff;
  padding: 0.5rem 1rem;
  z-index: 100;
  border-radius: 0 0 var(--radius-sm) 0;
}
.skip-link:focus { top: 0; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--color-bg) 92%, transparent);
  backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--color-border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 0.75rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--color-text);
}

.brand:hover { text-decoration: none; }

.brand__mark {
  width: 1.75rem; height: 1.75rem;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-accent), var(--color-warm));
  display: inline-block;
  box-shadow: var(--shadow-sm);
}

.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text);
  width: 2.5rem; height: 2.5rem;
  border-radius: var(--radius-sm);
  padding: 0;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.nav-toggle__bars { display: inline-block; width: 1.1rem; height: 2px; background: currentColor; position: relative; }
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute; left: 0;
  width: 100%; height: 2px;
  background: currentColor;
}
.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after  { top: 6px; }

.site-nav ul {
  list-style: none;
  margin: 0; padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1rem;
}

.site-nav a {
  display: inline-block;
  padding: 0.4rem 0.6rem;
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-weight: 500;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  background: var(--color-surface-alt);
  text-decoration: none;
}

.site-nav a[aria-current="page"] {
  color: var(--color-accent);
  background: color-mix(in srgb, var(--color-accent) 12%, transparent);
}

@media (max-width: 760px) {
  .nav-toggle { display: inline-flex; }
  .site-nav {
    display: none;
    position: absolute;
    left: 0; right: 0; top: 100%;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 0.75rem 1.25rem 1.25rem;
    box-shadow: var(--shadow-md);
  }
  .site-nav.is-open { display: block; }
  .site-nav ul { flex-direction: column; gap: 0.25rem; }
  .site-nav a { display: block; padding: 0.65rem 0.5rem; }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: clamp(3rem, 6vw, 5.5rem) 0;
  background:
    radial-gradient(1200px 600px at 80% -10%, color-mix(in srgb, var(--color-accent) 22%, transparent), transparent 60%),
    radial-gradient(800px 500px at -10% 110%, color-mix(in srgb, var(--color-warm) 22%, transparent), transparent 60%),
    var(--color-bg);
  overflow: hidden;
}

.hero__grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: center;
}

@media (max-width: 800px) {
  .hero__grid { grid-template-columns: 1fr; }
}

.hero__title {
  margin-bottom: 0.75rem;
}

.hero__lede {
  font-size: 1.15rem;
  color: var(--color-muted);
  max-width: 36ch;
}

.hero__cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1rem;
  padding: 0.75rem 1.25rem;
  background: var(--color-accent);
  color: #fff;
  border-radius: 999px;
  font-weight: 600;
  box-shadow: var(--shadow-md);
}
.hero__cta:hover { background: var(--color-accent-hover); text-decoration: none; }

.hero__art {
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-lg);
  background:
    linear-gradient(180deg, transparent 55%, rgba(0,0,0,0.18)),
    linear-gradient(180deg, #6cc1d8 0%, #79bfe0 35%, #c8a878 60%, #e7d3a7 100%);
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}

/* simple SVG-style "scene" rendered with gradients + shapes */
.hero__art::before,
.hero__art::after {
  content: "";
  position: absolute;
  inset: 0;
}
.hero__art::before {
  background:
    radial-gradient(50px 50px at 20% 20%, #fff 60%, transparent 62%); /* sun */
}
.hero__art::after {
  background:
    /* sail */
    linear-gradient(45deg, transparent 49%, #fff 50%, transparent 51%) 60% 60% / 60px 80px no-repeat,
    /* hull */
    radial-gradient(80px 20px at 70% 72%, #1a2a33 60%, transparent 62%);
}

/* ---------- Page header (non-home pages) ---------- */
.page-header {
  padding-block: clamp(2.5rem, 4vw, 4rem);
  background:
    radial-gradient(900px 400px at 100% 0%, color-mix(in srgb, var(--color-accent) 18%, transparent), transparent 60%),
    var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.page-header__lede {
  max-width: 56ch;
  color: var(--color-muted);
  font-size: 1.1rem;
}

/* ---------- Cards ---------- */
.card-grid {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 18rem), 1fr));
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.25rem 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: transform 120ms ease, box-shadow 120ms ease, border-color 120ms ease;
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: color-mix(in srgb, var(--color-accent) 40%, var(--color-border));
}

.card h3 { margin-bottom: 0.25rem; }
.card-meta {
  color: var(--color-muted);
  font-size: 0.85rem;
  margin: 0 0 0.75rem;
}
.card-practical {
  margin-top: auto;
  padding-top: 0.75rem;
  border-top: 1px dashed var(--color-border);
  font-size: 0.9rem;
  color: var(--color-muted);
}

.card-link {
  display: flex;
  flex-direction: column;
  color: inherit;
}
.card-link:hover { text-decoration: none; color: inherit; }

.card-emoji {
  font-size: 1.6rem;
  margin-bottom: 0.5rem;
}

/* Topic-card variant (homepage) */
.topic-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: transform 120ms ease, box-shadow 120ms ease;
}
.topic-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.topic-card h3 {
  display: flex; align-items: center; gap: 0.5rem;
  margin-bottom: 0.25rem;
}
.topic-card p { color: var(--color-muted); margin: 0.25rem 0 0.75rem; }
.topic-card__more { font-weight: 600; }

/* ---------- Callouts ---------- */
.callout {
  border-left: 4px solid var(--color-warm);
  background: color-mix(in srgb, var(--color-warm) 10%, var(--color-surface));
  padding: 1rem 1.25rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 1.5rem 0;
}
.callout--info {
  border-left-color: var(--color-accent);
  background: color-mix(in srgb, var(--color-accent) 10%, var(--color-surface));
}
.callout p:last-child { margin-bottom: 0; }

/* ---------- Lists ---------- */
.list-tight {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.5rem;
}
.list-tight li {
  display: flex;
  gap: 0.6rem;
  align-items: baseline;
}
.list-tight li::before {
  content: "•";
  color: var(--color-accent);
  font-weight: 700;
}

/* ---------- Footer ---------- */
.site-footer {
  margin-top: 4rem;
  padding: 2rem 0 2.5rem;
  border-top: 1px solid var(--color-border);
  background: var(--color-surface-alt);
  color: var(--color-muted);
  font-size: 0.9rem;
}
.site-footer__grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: 1fr auto;
  align-items: start;
}
@media (max-width: 600px) {
  .site-footer__grid { grid-template-columns: 1fr; }
}
.site-footer a { color: var(--color-text); }
.site-footer ul { list-style: none; padding: 0; margin: 0; display: flex; gap: 1rem; flex-wrap: wrap; }

/* ---------- Utility ---------- */
.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0);
  white-space: nowrap; border: 0;
}

.text-muted { color: var(--color-muted); }
.mt-0 { margin-top: 0; }