/* ============================================================================
   Arduino-kurs — GitHub Pages site
   ----------------------------------------------------------------------------
   Återanvänder designtokens från presentation/styles/main.css MED MEDVETEN DRIFT
   för tätare typografi och bättre WCAG AA-kontrast i sub-presentation-storlek:
     • --ak-text-mute justerat #8a95a3 → #5b6577 (kontrast 2.91 → 5.62 mot bg)
   Övriga tokens (--ak-accent, --ak-warn, --ak-bg-raised, --ak-border) speglar
   presentationen. Vid ändring av token-värden där: uppdatera båda samtidigt
   eller dokumentera divergensen här.
   ============================================================================ */

/* 1. Design tokens --------------------------------------------------------- */
:root {
  --ak-bg:        #fafaf7;
  --ak-bg-raised: #f0f1ed;
  --ak-border:    #d4d6d0;

  --ak-text:      #0a0e14;
  --ak-text-dim:  #4a5568;
  --ak-text-mute: #5b6577;

  --ak-accent:      #00747d;
  --ak-accent-hover:#005c63;
  --ak-accent-soft: rgba(0, 116, 125, 0.10);

  --ak-warn:   #b45309;
  --ak-danger: #be123c;
  --ak-success:#2e7d32;

  --ak-shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.05);
  --ak-shadow:    0 1px 3px rgba(15, 23, 42, 0.06), 0 6px 18px rgba(15, 23, 42, 0.06);
  --ak-shadow-lg: 0 10px 30px rgba(15, 23, 42, 0.10);
  --ak-glow:      0 0 24px rgba(0, 116, 125, 0.15);

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

  --ak-font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --ak-font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --ak-container: 1100px;
}

/* 2. Reset + base --------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--ak-bg);
  color: var(--ak-text);
  font: 17px/1.6 var(--ak-font);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg { max-width: 100%; height: auto; display: block; }
a {
  color: var(--ak-accent);
  text-decoration: none;
  transition: color 0.15s ease;
}
a:hover { color: var(--ak-accent-hover); text-decoration: underline; }
button { font: inherit; }

h1, h2, h3, h4 { line-height: 1.15; letter-spacing: -0.015em; margin: 0 0 0.6em; color: var(--ak-text); }
h1 { font-size: clamp(2rem, 4vw, 3rem); font-weight: 800; letter-spacing: -0.025em; }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); font-weight: 700; }
h3 { font-size: 1.25rem; font-weight: 600; }
h4 { font-size: 1.05rem; font-weight: 600; color: var(--ak-text-dim); text-transform: uppercase; letter-spacing: 0.05em; }
p { margin: 0 0 1em; }

code {
  font-family: var(--ak-font-mono);
  font-size: 0.92em;
  background: var(--ak-accent-soft);
  color: #00505a;             /* AA-pass mot accent-soft över raised + white */
  padding: 0.12em 0.4em;
  border-radius: 4px;
}
pre {
  font-family: var(--ak-font-mono);
  font-size: 0.92rem;
  line-height: 1.55;
  background: #ffffff;
  border: 1px solid var(--ak-border);
  border-radius: var(--ak-radius);
  box-shadow: var(--ak-shadow-sm);
  padding: 1.2rem 1.4rem;
  overflow-x: auto;
  margin: 1.2rem 0;
}
pre code { background: none; color: var(--ak-text); padding: 0; font-size: inherit; }

/* 3. Layout primitives ---------------------------------------------------- */
.container {
  max-width: var(--ak-container);
  margin: 0 auto;
  padding: 0 24px;
}
.container.wide { max-width: 1280px; }

/* 4. Top navigation ------------------------------------------------------- */
.site-nav {
  position: sticky;
  top: 0;
  background: color-mix(in srgb, var(--ak-bg) 92%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--ak-border);
  z-index: 50;
}
.site-nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 16px;
}
.site-nav .brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ak-text);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: -0.01em;
}
.site-nav .brand:hover { text-decoration: none; }
.site-nav .brand .logo {
  display: inline-flex;
  width: 28px;
  height: 28px;
  border-radius: 6px;
  background: var(--ak-accent);
  color: #fff;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 800;
}
.site-nav nav {
  display: flex;
  gap: 24px;
  align-items: center;
  font-size: 0.94rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}
.site-nav nav a {
  color: var(--ak-text-dim);
  font-weight: 500;
  white-space: nowrap;
}
.site-nav nav a:hover,
.site-nav nav a.active {
  color: var(--ak-text);
  text-decoration: none;
}

/* 5. Hero ----------------------------------------------------------------- */
.hero {
  padding: 80px 0 64px;
  border-bottom: 1px solid var(--ak-border);
  background:
    radial-gradient(circle at 80% 20%, var(--ak-accent-soft) 0%, transparent 50%),
    radial-gradient(circle at 10% 90%, color-mix(in srgb, var(--ak-warn) 6%, transparent) 0%, transparent 50%);
}
.hero .eyebrow {
  font-family: var(--ak-font-mono);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.78rem;
  color: var(--ak-accent);
  margin-bottom: 14px;
  font-weight: 600;
}
.hero h1 { max-width: 22ch; margin-bottom: 16px; }
.hero p.lead {
  font-size: clamp(1.1rem, 1.8vw, 1.3rem);
  color: var(--ak-text-dim);
  max-width: 60ch;
  margin: 0 0 32px;
}
.hero .actions { display: flex; gap: 12px; flex-wrap: wrap; }

/* 6. Buttons -------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 20px;
  border-radius: var(--ak-radius-sm);
  background: var(--ak-accent);
  color: #fff;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid var(--ak-accent);
  transition: all 0.15s ease;
  cursor: pointer;
  text-decoration: none;
}
.btn:hover {
  background: var(--ak-accent-hover);
  border-color: var(--ak-accent-hover);
  color: #fff;
  text-decoration: none;
  transform: translateY(-1px);
  box-shadow: var(--ak-shadow);
}
.btn.ghost {
  background: transparent;
  color: var(--ak-accent);
}
.btn.ghost:hover {
  background: var(--ak-accent-soft);
  color: var(--ak-accent-hover);
  border-color: var(--ak-accent-hover);
}
.btn.small { padding: 7px 14px; font-size: 0.88rem; }

/* 7. Section primitives --------------------------------------------------- */
section.page-section {
  padding: 64px 0;
  border-bottom: 1px solid var(--ak-border);
}
section.page-section:last-of-type { border-bottom: 0; }
.section-eyebrow {
  font-family: var(--ak-font-mono);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.74rem;
  color: var(--ak-accent);
  margin-bottom: 10px;
  font-weight: 600;
}

/* 8. Dag-grid (5 cards) --------------------------------------------------- */
.dag-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 18px;
  margin-top: 32px;
}
.dag-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 24px;
  background: #ffffff;
  border: 1px solid var(--ak-border);
  border-radius: var(--ak-radius);
  box-shadow: var(--ak-shadow-sm);
  color: var(--ak-text);
  transition: all 0.18s ease;
  position: relative;
  overflow: hidden;
}
.dag-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--ak-accent-soft) 0%, transparent 70%);
  opacity: 0;
  transition: opacity 0.18s ease;
  pointer-events: none;
}
.dag-card:hover {
  border-color: var(--ak-accent);
  box-shadow: var(--ak-shadow), var(--ak-glow);
  transform: translateY(-2px);
  text-decoration: none;
  color: var(--ak-text);
}
.dag-card:hover::before { opacity: 1; }
.dag-card .num {
  font-family: var(--ak-font-mono);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  font-size: 0.72rem;
  color: var(--ak-accent);
  font-weight: 700;
}
.dag-card h3 { margin: 0; font-size: 1.2rem; }
.dag-card p { margin: 0; color: var(--ak-text-dim); font-size: 0.95rem; }
.dag-card .topics {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 12px;
}
.dag-card .tag {
  font-family: var(--ak-font-mono);
  font-size: 0.74rem;
  color: var(--ak-text-dim);
  background: var(--ak-bg-raised);
  border: 1px solid var(--ak-border);
  padding: 3px 8px;
  border-radius: 999px;
}
.dag-card .arrow {
  margin-top: 14px;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--ak-accent);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* 9. Skill-list ----------------------------------------------------------- */
.skills {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 18px;
  margin-top: 24px;
}
.skill {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 20px;
  background: var(--ak-bg-raised);
  border-radius: var(--ak-radius);
  border-left: 3px solid var(--ak-accent);
}
.skill strong { color: var(--ak-text); font-weight: 700; font-size: 0.98rem; }
.skill span { color: var(--ak-text-dim); font-size: 0.9rem; }

/* 10. CTA-block ----------------------------------------------------------- */
.cta-block {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 32px 36px;
  background: linear-gradient(135deg, var(--ak-accent-soft), transparent);
  border: 1px solid var(--ak-border);
  border-radius: var(--ak-radius-lg);
  margin-top: 32px;
  flex-wrap: wrap;
}
.cta-block h3 { margin: 0 0 4px; }
.cta-block p { margin: 0; color: var(--ak-text-dim); }

/* 11. Footer -------------------------------------------------------------- */
.site-footer {
  padding: 48px 0 32px;
  background: var(--ak-bg-raised);
  border-top: 1px solid var(--ak-border);
  color: var(--ak-text-dim);
  font-size: 0.92rem;
}
.site-footer .container {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 32px;
}
.site-footer h4 {
  font-size: 0.78rem;
  color: var(--ak-text);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 12px;
}
.site-footer a { color: var(--ak-text-dim); }
.site-footer a:hover { color: var(--ak-accent); }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer ul li { margin-bottom: 6px; }
.site-footer .colophon {
  grid-column: 1 / -1;
  padding-top: 24px;
  margin-top: 16px;
  border-top: 1px solid var(--ak-border);
  font-size: 0.85rem;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

/* 12. Dag-page-specific (used by dag/*.html) ------------------------------ */
.dag-hero {
  padding: 56px 0 40px;
  background:
    radial-gradient(circle at 70% 30%, var(--ak-accent-soft), transparent 60%);
  border-bottom: 1px solid var(--ak-border);
}
.dag-hero .breadcrumb {
  font-family: var(--ak-font-mono);
  font-size: 0.82rem;
  color: var(--ak-text-mute);
  margin-bottom: 16px;
  letter-spacing: 0.05em;
}
.dag-hero .breadcrumb a { color: var(--ak-text-mute); }
.dag-hero h1 { margin-bottom: 12px; }
.dag-hero p.lead { font-size: 1.15rem; color: var(--ak-text-dim); max-width: 60ch; margin: 0; }

.material-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
  margin: 24px 0 40px;
}
.material-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 22px;
  background: #ffffff;
  border: 1px solid var(--ak-border);
  border-radius: var(--ak-radius);
  text-decoration: none;
  color: var(--ak-text);
  transition: all 0.15s ease;
}
.material-card:hover {
  border-color: var(--ak-accent);
  box-shadow: var(--ak-shadow);
  transform: translateY(-1px);
  text-decoration: none;
}
.material-card .icon { font-size: 1.6rem; color: var(--ak-accent); }
.material-card .label { font-weight: 600; color: var(--ak-text); }
.material-card .desc { font-size: 0.88rem; color: var(--ak-text-dim); }

.dag-section { margin: 48px 0; }
.dag-section h2 { margin-bottom: 8px; }
.dag-section p.intro { color: var(--ak-text-dim); max-width: 65ch; margin: 0 0 24px; }

.code-block {
  position: relative;
  margin: 1.4rem 0;
}
.code-block .filename {
  font-family: var(--ak-font-mono);
  font-size: 0.82rem;
  color: var(--ak-text-mute);
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.code-block .filename a {
  color: var(--ak-accent);
  font-weight: 500;
}
.image-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 18px;
  margin: 24px 0;
}
.image-row figure {
  margin: 0;
  background: #ffffff;
  border: 1px solid var(--ak-border);
  border-radius: var(--ak-radius);
  overflow: hidden;
  box-shadow: var(--ak-shadow-sm);
  display: flex;
  flex-direction: column;
}
.image-row figure img {
  width: 100%;
  height: auto;
  max-height: 420px;
  object-fit: contain;
  background: var(--ak-bg);
  padding: 16px;
  flex: 1 1 auto;
  min-height: 220px;
}
/* Single-figur i en image-row: begränsa figurens bredd så bilden inte
   simmar i tom yta. Centrera. Multi-figur-rows får dela bredd ändå. */
.image-row:has(> figure:only-child) {
  grid-template-columns: minmax(0, 640px);
  justify-content: center;
}
.image-row:has(> figure:only-child) figure img {
  max-height: 480px;
  min-height: 260px;
}
.image-row figure figcaption {
  padding: 12px 16px;
  font-size: 0.88rem;
  color: var(--ak-text-dim);
  border-top: 1px solid var(--ak-border);
}

.tip {
  border-left: 3px solid var(--ak-accent);
  background: var(--ak-accent-soft);
  padding: 14px 18px;
  border-radius: var(--ak-radius-sm);
  margin: 20px 0;
}
.tip strong { color: var(--ak-accent); }

.warn {
  border-left: 3px solid var(--ak-danger);
  background: color-mix(in srgb, var(--ak-danger) 6%, transparent);
  padding: 14px 18px;
  border-radius: var(--ak-radius-sm);
  margin: 20px 0;
}
.warn strong { color: var(--ak-danger); }

.next-dag {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 28px 32px;
  background: var(--ak-bg-raised);
  border-radius: var(--ak-radius);
  margin-top: 48px;
  gap: 24px;
  flex-wrap: wrap;
}
.next-dag .label {
  font-family: var(--ak-font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--ak-text-mute);
  margin-bottom: 4px;
}
.next-dag strong { font-size: 1.1rem; color: var(--ak-text); }

/* 13. Tables (used on nedladdningar) -------------------------------------- */
table.dl {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
  margin: 16px 0 32px;
  background: #ffffff;
  border: 1px solid var(--ak-border);
  border-radius: var(--ak-radius);
  overflow: hidden;
  box-shadow: var(--ak-shadow-sm);
}
table.dl th, table.dl td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--ak-border);
}
table.dl th {
  background: var(--ak-bg-raised);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ak-text-dim);
  font-weight: 600;
}
table.dl tr:last-child td { border-bottom: 0; }
table.dl tr:hover td { background: var(--ak-bg); }
table.dl .meta {
  font-family: var(--ak-font-mono);
  font-size: 0.82rem;
  color: var(--ak-text-mute);
  white-space: nowrap;
}
table.dl a.dl-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 500;
}

/* 14. Mobile -------------------------------------------------------------- */
@media (max-width: 768px) {
  .site-nav .container { height: 56px; }
  .site-nav nav { gap: 14px; font-size: 0.88rem; }
  .hero { padding: 56px 0 48px; }
  section.page-section { padding: 48px 0; }
  .cta-block { padding: 24px; }
  .cta-block .btn { width: 100%; justify-content: center; }
  .site-footer .container { grid-template-columns: 1fr; }
  .next-dag { flex-direction: column; align-items: stretch; }
  .next-dag .btn { width: 100%; justify-content: center; }
  .dag-hero { padding: 40px 0 32px; }
}

/* 15. Focus visibility (a11y) -------------------------------------------- */
:focus-visible {
  outline: 2px solid var(--ak-accent);
  outline-offset: 2px;
  border-radius: 4px;
}
.btn:focus-visible {
  outline-offset: 3px;
}

/* 16. Syntax-highlight contrast overrides (highlight.js github-theme) ---- */
.hljs-built_in { color: #0a3069 !important; }      /* AA-pass for Arduino builtins like digitalWrite */
.hljs-comment, .hljs-quote { color: #4a5568 !important; }  /* AA-pass for // comments */