/* ============================================================================
   whattoBite — Blog design system
   Static, dependency-free stylesheet shared by every /blog/ page.
   Brand: true-black glass + cyan #00E0FF -> purple #6A00FF -> pink #FF0090.
   Optimised for long-form reading (contrast, measure, rhythm) and SEO/GEO.
   ========================================================================== */

:root {
  --wtb-bg: #07080f;
  --wtb-bg-2: #0b0d18;
  --wtb-surface: rgba(255, 255, 255, 0.045);
  --wtb-surface-2: rgba(255, 255, 255, 0.07);
  --wtb-border: rgba(255, 255, 255, 0.1);
  --wtb-border-strong: rgba(255, 255, 255, 0.16);

  --wtb-text: #e8eaf5;
  --wtb-text-soft: #b9bed3;
  --wtb-text-dim: #868ca6;

  --wtb-cyan: #00e0ff;
  --wtb-purple: #6a00ff;
  --wtb-pink: #ff0090;
  --wtb-grad: linear-gradient(135deg, #00e0ff 0%, #6a00ff 52%, #ff0090 100%);
  --wtb-grad-soft: linear-gradient(135deg, rgba(0, 224, 255, 0.16), rgba(106, 0, 255, 0.16), rgba(255, 0, 144, 0.16));

  --wtb-radius: 18px;
  --wtb-radius-sm: 12px;
  --wtb-maxw: 760px;
  --wtb-shadow: 0 24px 60px -24px rgba(0, 0, 0, 0.8);
  --wtb-font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto,
    Helvetica, Arial, "Apple Color Emoji", sans-serif;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--wtb-bg);
  color: var(--wtb-text);
  font-family: var(--wtb-font);
  font-size: 18px;
  line-height: 1.75;
  letter-spacing: 0.1px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* Aurora glow anchored to the top of the page */
body::before {
  content: "";
  position: fixed;
  inset: -20% -10% auto -10%;
  height: 70vh;
  background:
    radial-gradient(50% 60% at 18% 0%, rgba(0, 224, 255, 0.18), transparent 70%),
    radial-gradient(45% 55% at 78% 4%, rgba(255, 0, 144, 0.16), transparent 70%),
    radial-gradient(60% 60% at 50% -10%, rgba(106, 0, 255, 0.2), transparent 72%);
  filter: blur(10px);
  z-index: -1;
  pointer-events: none;
}

a { color: var(--wtb-cyan); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

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

/* ------------------------------------------------------------------ Header */
.wtb-header {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px clamp(16px, 5vw, 40px);
  background: rgba(7, 8, 15, 0.72);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--wtb-border);
}
.wtb-header__logo { display: inline-flex; align-items: center; }
.wtb-header__logo img { height: 26px; width: auto; display: block; }
.wtb-nav { display: flex; align-items: center; gap: 22px; }
.wtb-nav a {
  color: var(--wtb-text-soft);
  font-size: 15px;
  font-weight: 500;
}
.wtb-nav a:hover { color: #fff; text-decoration: none; }
.wtb-nav__cta {
  padding: 9px 18px;
  border-radius: 999px;
  background: var(--wtb-grad);
  color: #fff !important;
  font-weight: 700 !important;
  box-shadow: 0 8px 24px -8px rgba(106, 0, 255, 0.7);
}
.wtb-nav__cta:hover { filter: brightness(1.08); text-decoration: none !important; }
@media (max-width: 720px) {
  .wtb-nav { gap: 14px; }
  .wtb-nav a:not(.wtb-nav__cta) { display: none; }
}

/* ---------------------------------------------------------------- Layout */
.wtb-wrap {
  max-width: var(--wtb-maxw);
  margin: 0 auto;
  padding: 0 clamp(16px, 5vw, 28px);
}
.wtb-main { padding: 40px 0 96px; }

/* ------------------------------------------------------------ Breadcrumb */
.wtb-crumbs {
  font-size: 13.5px;
  color: var(--wtb-text-dim);
  margin: 8px 0 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}
.wtb-crumbs a { color: var(--wtb-text-soft); }
.wtb-crumbs span[aria-current] { color: var(--wtb-text); }
.wtb-crumbs .sep { color: var(--wtb-text-dim); }

/* --------------------------------------------------------- Article header */
.wtb-eyebrow {
  display: inline-block;
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 1.4px;
  text-transform: uppercase;
  padding: 6px 12px;
  border-radius: 999px;
  color: #d8dcff;
  background: var(--wtb-grad-soft);
  border: 1px solid var(--wtb-border-strong);
  margin-bottom: 18px;
}
h1.wtb-title {
  font-size: clamp(30px, 5.5vw, 46px);
  line-height: 1.12;
  letter-spacing: -0.5px;
  font-weight: 800;
  margin: 0 0 18px;
  color: #fff;
}
.wtb-lede {
  font-size: 20px;
  line-height: 1.6;
  color: var(--wtb-text-soft);
  margin: 0 0 22px;
}
.wtb-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  font-size: 14px;
  color: var(--wtb-text-dim);
  padding-bottom: 26px;
  border-bottom: 1px solid var(--wtb-border);
  margin-bottom: 30px;
}
.wtb-meta .dot { width: 3px; height: 3px; border-radius: 50%; background: var(--wtb-text-dim); }
.wtb-meta strong { color: var(--wtb-text-soft); font-weight: 600; }

/* ----------------------------------------------------- Key takeaways box */
.wtb-tldr {
  background: var(--wtb-surface);
  border: 1px solid var(--wtb-border-strong);
  border-left: 3px solid transparent;
  border-image: var(--wtb-grad) 1;
  border-radius: var(--wtb-radius);
  padding: 22px 24px;
  margin: 0 0 34px;
}
.wtb-tldr h2 {
  font-size: 13px;
  letter-spacing: 1.4px;
  text-transform: uppercase;
  color: var(--wtb-cyan);
  margin: 0 0 12px;
}
.wtb-tldr ul { margin: 0; padding-left: 20px; }
.wtb-tldr li { margin: 7px 0; color: var(--wtb-text); }

/* --------------------------------------------------------------- TOC card */
.wtb-toc {
  background: var(--wtb-surface);
  border: 1px solid var(--wtb-border);
  border-radius: var(--wtb-radius);
  padding: 18px 22px;
  margin: 0 0 40px;
}
.wtb-toc h2 {
  font-size: 13px;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--wtb-text-dim);
  margin: 0 0 10px;
}
.wtb-toc ol { margin: 0; padding-left: 20px; }
.wtb-toc li { margin: 5px 0; }
.wtb-toc a { color: var(--wtb-text-soft); }
.wtb-toc a:hover { color: var(--wtb-cyan); }

/* ------------------------------------------------------------- Article body */
.wtb-article h2 {
  font-size: clamp(23px, 3.6vw, 30px);
  line-height: 1.25;
  font-weight: 800;
  color: #fff;
  margin: 46px 0 14px;
  letter-spacing: -0.3px;
  scroll-margin-top: 84px;
}
.wtb-article h3 {
  font-size: clamp(19px, 2.8vw, 22px);
  font-weight: 700;
  color: #f2f3fb;
  margin: 32px 0 10px;
  scroll-margin-top: 84px;
}
.wtb-article p { margin: 0 0 20px; color: var(--wtb-text); }
.wtb-article ul,
.wtb-article ol { margin: 0 0 22px; padding-left: 26px; }
.wtb-article li { margin: 9px 0; }
.wtb-article li::marker { color: var(--wtb-cyan); }
.wtb-article strong { color: #fff; font-weight: 700; }
.wtb-article a { border-bottom: 1px solid rgba(0, 224, 255, 0.4); }
.wtb-article a:hover { text-decoration: none; border-bottom-color: var(--wtb-cyan); }

.wtb-article blockquote {
  margin: 26px 0;
  padding: 4px 0 4px 22px;
  border-left: 3px solid var(--wtb-purple);
  color: var(--wtb-text-soft);
  font-size: 20px;
  font-style: italic;
}

/* Callout / note */
.wtb-note {
  background: var(--wtb-grad-soft);
  border: 1px solid var(--wtb-border-strong);
  border-radius: var(--wtb-radius-sm);
  padding: 16px 20px;
  margin: 26px 0;
  font-size: 16.5px;
  color: var(--wtb-text-soft);
}
.wtb-note strong { color: #fff; }

/* Tables (responsive scroll) */
.wtb-tablewrap {
  overflow-x: auto;
  margin: 26px 0;
  border: 1px solid var(--wtb-border);
  border-radius: var(--wtb-radius-sm);
  -webkit-overflow-scrolling: touch;
}
.wtb-article table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15.5px;
  min-width: 520px;
}
.wtb-article th,
.wtb-article td {
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid var(--wtb-border);
  vertical-align: top;
}
.wtb-article thead th {
  background: rgba(255, 255, 255, 0.05);
  color: #fff;
  font-weight: 700;
  white-space: nowrap;
}
.wtb-article tbody tr:last-child td { border-bottom: none; }
.wtb-article tbody tr:nth-child(even) td { background: rgba(255, 255, 255, 0.02); }
.wtb-article td strong { color: var(--wtb-cyan); }

/* ------------------------------------------------------------------ FAQ */
.wtb-faq { margin: 46px 0 10px; }
.wtb-faq h2 { margin-bottom: 8px; }
.wtb-faq details {
  border: 1px solid var(--wtb-border);
  border-radius: var(--wtb-radius-sm);
  padding: 4px 20px;
  margin: 12px 0;
  background: var(--wtb-surface);
}
.wtb-faq details[open] { border-color: var(--wtb-border-strong); }
.wtb-faq summary {
  cursor: pointer;
  list-style: none;
  padding: 14px 0;
  font-weight: 700;
  color: #fff;
  font-size: 17.5px;
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: center;
}
.wtb-faq summary::-webkit-details-marker { display: none; }
.wtb-faq summary::after {
  content: "+";
  color: var(--wtb-cyan);
  font-size: 24px;
  line-height: 1;
  transition: transform 0.2s ease;
}
.wtb-faq details[open] summary::after { transform: rotate(45deg); }
.wtb-faq details > p {
  margin: 0 0 16px;
  color: var(--wtb-text-soft);
  font-size: 16.5px;
}

/* --------------------------------------------------------------- CTA box */
.wtb-cta {
  position: relative;
  margin: 48px 0;
  padding: 30px 28px;
  border-radius: var(--wtb-radius);
  background: linear-gradient(135deg, rgba(0, 224, 255, 0.1), rgba(106, 0, 255, 0.12), rgba(255, 0, 144, 0.1));
  border: 1px solid var(--wtb-border-strong);
  text-align: center;
  overflow: hidden;
}
.wtb-cta h2 {
  margin: 0 0 8px;
  font-size: 25px;
  color: #fff;
  font-weight: 800;
}
.wtb-cta p { margin: 0 0 20px; color: var(--wtb-text-soft); }
.wtb-btn {
  display: inline-block;
  padding: 14px 30px;
  border-radius: 999px;
  background: var(--wtb-grad);
  color: #fff !important;
  font-weight: 800;
  font-size: 16.5px;
  border: none;
  box-shadow: 0 14px 34px -12px rgba(106, 0, 255, 0.8);
}
.wtb-btn:hover { filter: brightness(1.08); text-decoration: none !important; }
.wtb-btn--ghost {
  background: transparent;
  border: 1px solid var(--wtb-border-strong);
  box-shadow: none;
  color: var(--wtb-text) !important;
}

/* ------------------------------------------------------- Author / share */
.wtb-author {
  display: flex;
  gap: 14px;
  align-items: center;
  padding: 20px 0;
  border-top: 1px solid var(--wtb-border);
  border-bottom: 1px solid var(--wtb-border);
  margin: 40px 0;
}
.wtb-author__badge {
  flex: none;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--wtb-grad);
  display: grid;
  place-items: center;
  font-weight: 800;
  color: #fff;
}
.wtb-author__name { color: #fff; font-weight: 700; font-size: 15.5px; }
.wtb-author__bio { color: var(--wtb-text-dim); font-size: 14px; }

/* ----------------------------------------------------------- Related grid */
.wtb-related { margin: 50px 0 10px; }
.wtb-related h2 { font-size: 22px; color: #fff; margin: 0 0 18px; }
.wtb-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 16px;
}
.wtb-card {
  display: block;
  padding: 20px;
  border-radius: var(--wtb-radius);
  background: var(--wtb-surface);
  border: 1px solid var(--wtb-border);
  transition: transform 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}
.wtb-card:hover {
  transform: translateY(-3px);
  border-color: var(--wtb-border-strong);
  background: var(--wtb-surface-2);
  text-decoration: none;
}
.wtb-card__tag {
  font-size: 11.5px;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--wtb-cyan);
  font-weight: 700;
}
.wtb-card__title {
  color: #fff;
  font-weight: 700;
  font-size: 17px;
  line-height: 1.35;
  margin: 8px 0 0;
}

/* ------------------------------------------------------------ Blog index */
.wtb-hero {
  text-align: center;
  padding: 60px 0 30px;
}
.wtb-hero h1 {
  font-size: clamp(34px, 6vw, 54px);
  font-weight: 800;
  letter-spacing: -0.6px;
  margin: 10px 0 14px;
  background: var(--wtb-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.wtb-hero p {
  max-width: 640px;
  margin: 0 auto;
  color: var(--wtb-text-soft);
  font-size: 19px;
}
.wtb-index-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 22px;
  padding: 30px 0 90px;
}
.wtb-post-card {
  display: flex;
  flex-direction: column;
  padding: 26px;
  border-radius: var(--wtb-radius);
  background: var(--wtb-surface);
  border: 1px solid var(--wtb-border);
  transition: transform 0.18s ease, border-color 0.18s ease, background 0.18s ease;
  min-height: 220px;
}
.wtb-post-card:hover {
  transform: translateY(-4px);
  border-color: var(--wtb-border-strong);
  background: var(--wtb-surface-2);
  text-decoration: none;
}
.wtb-post-card__tag {
  font-size: 12px;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--wtb-cyan);
  font-weight: 700;
}
.wtb-post-card__title {
  color: #fff;
  font-weight: 800;
  font-size: 22px;
  line-height: 1.25;
  margin: 12px 0 10px;
  letter-spacing: -0.3px;
}
.wtb-post-card__excerpt { color: var(--wtb-text-soft); font-size: 16px; margin: 0; }
.wtb-post-card__meta {
  margin-top: auto;
  padding-top: 16px;
  color: var(--wtb-text-dim);
  font-size: 13.5px;
}
.wtb-post-card--feature { grid-column: 1 / -1; background: var(--wtb-grad-soft); }

/* ----------------------------------------------------------------- Footer */
.wtb-footer {
  border-top: 1px solid var(--wtb-border);
  padding: 40px clamp(16px, 5vw, 40px);
  color: var(--wtb-text-dim);
  font-size: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px 26px;
  align-items: center;
  justify-content: space-between;
}
.wtb-footer a { color: var(--wtb-text-soft); }
.wtb-footer__links { display: flex; flex-wrap: wrap; gap: 18px; }

/* ------------------------------------------------------------- A11y utils */
.wtb-skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: #fff;
  color: #000;
  padding: 10px 16px;
  border-radius: 8px;
  z-index: 100;
}
.wtb-skip:focus { left: 12px; top: 12px; }

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