/* ════════════════════════════════════════════════════════════════
   b4Help Tech Blog — themed to match b4help.com
   Design tokens & components from the b4Help Design Specification.
   ════════════════════════════════════════════════════════════════ */

/* ─── Design Tokens ──────────────────────────────────────────── */
:root {
  /* Backgrounds (darkest → lighter) */
  --bg:#060d1f;
  --bg-2:#0a1530;
  --navy:#0c1d3d;

  /* Surfaces (cards / panels, dark → light) */
  --surface:#0f1f3d;
  --surface-2:#15264a;
  --surface-3:#1b3057;

  /* Text */
  --text:#eaf1ff;
  --muted:#94a8ca;
  --muted-2:#6f86ab;

  /* Accents — blue (primary) */
  --accent:#5b9bff;
  --accent-2:#4f8df9;
  --accent-soft:rgba(91,155,255,.14);

  /* Accents — green (success / results) */
  --green:#34d399;
  --green-2:#10b981;
  --green-soft:rgba(52,211,153,.13);

  /* Additional accents */
  --teal:#2dd4bf;
  --amber:#fbbf24;
  --red:#f87171;

  /* Borders (hairlines on dark) */
  --border:rgba(124,158,214,.14);
  --border-2:rgba(124,158,214,.26);

  /* Geometry & motion */
  --r:18px;
  --maxw:860px;            /* readable blog measure (spec allows 640–760 for text) */
  --ease:cubic-bezier(.22,.61,.36,1);

  /* Signature gradients */
  --grad-blue-text:linear-gradient(110deg,#ffffff 6%,#bcd4ff 46%,#5b9bff 104%);
  --grad-green-text:linear-gradient(110deg,#fff 10%,#a7f3d0 60%,#34d399 105%);
  --grad-duo:linear-gradient(150deg,#4f8df9,#34d399);
  --grad-card:linear-gradient(180deg,#143055,#0c1d3d);
  --grad-band:linear-gradient(180deg,#0c1b38,#0a1428);
  --grad-btn-blue:linear-gradient(180deg,#6ba6ff,#4f8df9);
  --grad-btn-green:linear-gradient(180deg,#3ee0a0,#10b981);

  /* Shadows */
  --sh-card:0 28px 60px -30px rgba(0,0,0,.8);
  --sh-btn-blue:0 8px 28px -8px rgba(79,141,249,.7), inset 0 1px 0 rgba(255,255,255,.35);

  /* Typography */
  --mono:'JetBrains Mono', monospace;
  --sans:'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --display:'Space Grotesk', 'Inter', sans-serif;
}

/* ─── Reset ──────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  background-image:
    radial-gradient(ellipse 70% 45% at 50% -10%, rgba(79,141,249,0.12) 0%, transparent 60%);
}

a { color: inherit; }

/* Gradient-text helper */
.grad-text {
  background: var(--grad-blue-text);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
}
.grad-text.green {
  background: var(--grad-green-text);
  -webkit-background-clip: text; background-clip: text;
}

/* ─── Container ──────────────────────────────────────────────── */
.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

/* ─── Header (sticky, blurred) ───────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: linear-gradient(180deg, rgba(13,30,63,.7), rgba(13,30,63,.45));
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  border-bottom: 1px solid var(--border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.logo {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
}

.logo-img {
  height: 30px;
  width: auto;
  display: block;
}

.logo-sub {
  font-family: var(--mono);
  font-size: 0.6rem;
  color: var(--accent);
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 3px 8px;
  border: 1px solid var(--border-2);
  background: var(--accent-soft);
  border-radius: 100px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.nav-link {
  font-family: var(--sans);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--muted);
  text-decoration: none;
  padding: 0.45rem 0.85rem;
  border-radius: 100px;
  transition: color var(--ease) .2s, background var(--ease) .2s;
}

.nav-link:hover {
  color: var(--text);
  background: rgba(255,255,255,.05);
}

.nav-cta {
  color: #04122e;
  background: var(--grad-btn-blue);
  box-shadow: var(--sh-btn-blue);
  font-weight: 600;
  margin-left: 0.4rem;
}

.nav-cta:hover {
  color: #04122e;
  background: var(--grad-btn-blue);
  transform: translateY(-2px);
  filter: brightness(1.05);
}

/* ─── Main ───────────────────────────────────────────────────── */
.site-main {
  flex: 1;
  padding: 4rem 0 6rem;
}

/* ─── Eyebrow ────────────────────────────────────────────────── */
.eyebrow {
  font-family: var(--mono);
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--accent);
  display: inline-block;
}

/* ─── Post List (index) ──────────────────────────────────────── */
.post-list-header {
  margin-bottom: 3rem;
  max-width: 680px;
}

.post-list-header .eyebrow { margin-bottom: 0.9rem; }

.post-list-header h1 {
  font-family: var(--display);
  font-size: clamp(34px, 5vw, 58px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.06;
  color: var(--text);
}

.post-list-tagline {
  font-size: clamp(17px, 2vw, 20px);
  color: var(--muted);
  margin-top: 1rem;
  line-height: 1.55;
}

.post-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}

.post-card {
  background: var(--grad-card);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 1.75rem 2rem;
  text-decoration: none;
  display: block;
  box-shadow: var(--sh-card);
  transition: transform .25s var(--ease), border-color .25s var(--ease), box-shadow .25s var(--ease);
  position: relative;
  overflow: hidden;
}

.post-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-2);
}

.post-card-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.6rem;
  flex-wrap: wrap;
}

.post-date {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--muted-2);
  letter-spacing: 0.04em;
}

.post-tags {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.post-tag {
  font-family: var(--mono);
  font-size: 0.66rem;
  color: var(--green);
  background: var(--green-soft);
  border: 1px solid rgba(52,211,153,.22);
  border-radius: 100px;
  padding: 2px 9px;
  letter-spacing: 0.04em;
}

.post-card-title {
  font-family: var(--display);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
  line-height: 1.25;
}

.post-card-excerpt {
  font-size: 0.95rem;
  color: var(--muted);
  line-height: 1.6;
  max-width: 60ch;
}

.post-card-arrow {
  position: absolute;
  right: 1.75rem;
  top: 2rem;
  color: var(--accent);
  font-size: 1.1rem;
  transition: transform var(--ease) .2s;
}

.post-card:hover .post-card-arrow {
  transform: translateX(4px);
}

/* ─── Single Post ────────────────────────────────────────────── */
.back-link {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--muted);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.9rem;
  border: 1px solid var(--border-2);
  background: rgba(255,255,255,.04);
  border-radius: 100px;
  transition: all var(--ease) .2s;
  margin-bottom: 2rem;
}

.back-link:hover {
  color: var(--text);
  background: rgba(255,255,255,.08);
  transform: translateY(-2px);
}

.post-header {
  margin-bottom: 2.75rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border);
}

.post-header-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.1rem;
  flex-wrap: wrap;
}

.post-title {
  font-family: var(--display);
  font-size: clamp(30px, 4.6vw, 52px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.08;
  color: var(--text);
}

/* ─── Post Body Prose ────────────────────────────────────────── */
.post-body {
  font-size: 1.06rem;
  line-height: 1.8;
  color: var(--muted);
}

.post-body h1,
.post-body h2,
.post-body h3,
.post-body h4 {
  font-family: var(--display);
  color: var(--text);
  letter-spacing: -0.015em;
  margin: 2.75rem 0 0.9rem;
  line-height: 1.12;
}

.post-body h1 { font-size: clamp(26px, 3.4vw, 40px); font-weight: 700; }
.post-body h2 { font-size: clamp(22px, 2.6vw, 30px); font-weight: 700; }
.post-body h3 { font-size: 1.2rem; font-weight: 600; }

.post-body p { margin-bottom: 1.35rem; }

.post-body a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(91,155,255,.35);
  transition: border-color var(--ease) .2s, color var(--ease) .2s;
}

.post-body a:hover {
  color: var(--green);
  border-color: var(--green);
}

.post-body strong { color: var(--text); font-weight: 600; }
.post-body em     { color: var(--muted); font-style: italic; }

.post-body ul,
.post-body ol {
  padding-left: 1.5rem;
  margin-bottom: 1.35rem;
}

.post-body li { margin-bottom: 0.5rem; }
.post-body li::marker { color: var(--accent); }

.post-body blockquote {
  border-left: 3px solid;
  border-image: var(--grad-duo) 1;
  margin: 1.75rem 0;
  padding: 0.9rem 1.4rem;
  background: var(--surface);
  border-radius: 0 var(--r) var(--r) 0;
  color: var(--text);
  font-style: italic;
}

.post-body pre {
  background: var(--surface);
  border: 1px solid var(--border-2);
  border-radius: 14px;
  padding: 1.35rem 1.6rem;
  overflow-x: auto;
  margin: 1.75rem 0;
  font-family: var(--mono);
  font-size: 0.85rem;
  line-height: 1.7;
  box-shadow: var(--sh-card);
}

.post-body code {
  font-family: var(--mono);
  font-size: 0.85em;
  color: var(--green);
  background: var(--green-soft);
  border: 1px solid rgba(52,211,153,.2);
  border-radius: 6px;
  padding: 1px 6px;
}

.post-body pre code {
  background: none;
  border: none;
  padding: 0;
  color: var(--text);
}

.post-body hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.75rem 0;
}

.post-body img {
  max-width: 100%;
  border-radius: var(--r);
  border: 1px solid var(--border);
  margin: 1.75rem 0;
  box-shadow: var(--sh-card);
}

/* ─── About page ─────────────────────────────────────────────── */
.about-body { font-size: 1.06rem; line-height: 1.8; color: var(--muted); }
.about-body h1 {
  font-family: var(--display);
  font-size: clamp(34px, 5vw, 58px);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
  color: var(--text);
}
.about-body h2 {
  font-family: var(--display);
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 700;
  letter-spacing: -0.015em;
  margin: 2.5rem 0 0.9rem;
  color: var(--text);
}

/* ─── Footer ─────────────────────────────────────────────────── */
.site-footer {
  background: var(--grad-band);
  border-top: 1px solid var(--border);
  padding: 2.5rem 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.footer-logo-img {
  height: 26px;
  width: auto;
  display: block;
  opacity: 0.9;
}

.footer-copy {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--muted-2);
  letter-spacing: 0.02em;
}

.footer-link {
  font-family: var(--sans);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--accent);
  text-decoration: none;
  transition: color var(--ease) .2s;
}

.footer-link:hover { color: var(--green); }

/* ─── Responsive ─────────────────────────────────────────────── */
@media (max-width: 600px) {
  .container { padding: 0 18px; }
  .site-nav .nav-link:not(.nav-cta) { display: none; }
  .post-card-arrow { display: none; }
  .footer-inner { flex-direction: column; align-items: flex-start; gap: 0.75rem; }
}

/* ─── Reduced motion ─────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}