/* ==========================================================================
   PitStop Factory - Engineering Blog
   Bold, motorsport-inspired design matching PitStop's aesthetic
   ========================================================================== */

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

:root {
  /* PitStop Color System */
  --color-bg: #151d26;
  --color-highlight: color-mix(in hsl, #151d26 90%, white);
  --color-highlight-light: color-mix(in hsl, #151d26 85%, white);

  --color-text: #ffffff;
  --color-text-light: color-mix(in hsl, #151d26 30%, #ffffff);
  --color-text-muted: color-mix(in hsl, #151d26 45%, #ffffff);

  --color-primary: #ff4800;
  --color-secondary: #0087ff;

  /* Typography Scale */
  --size-display: clamp(2.5rem, 8vw, 4rem);
  --size-title-1: clamp(1.5rem, 4vw, 1.75rem);
  --size-title-2: 1.25rem;
  --size-title-3: 1.125rem;
  --size-body: 1rem;
  --size-callout: 0.875rem;
  --size-footnote: 0.75rem;

  /* Spacing */
  --spacing-1: 0.25rem;
  --spacing-2: 0.5rem;
  --spacing-3: 1rem;
  --spacing-4: 1.5rem;
  --spacing-5: 2rem;
  --spacing-6: 2.5rem;
  --spacing-7: 3rem;
  --spacing-8: 4rem;
  --spacing-10: 5rem;

  /* Radius */
  --radius-sm: 0.5rem;
  --radius-md: 1rem;
  --radius-lg: 1.5rem;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: system-ui, -apple-system, sans-serif;
  font-size: var(--size-body);
  line-height: 1.6;
  background-color: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
}

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

/* ==========================================================================
   Ambient Background Effects
   ========================================================================== */

.ambient-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.gradient-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
}

.gradient-orb-1 {
  top: -20%;
  right: -10%;
  width: 60vw;
  height: 60vw;
  max-width: 800px;
  max-height: 800px;
  background: radial-gradient(
    circle,
    color-mix(in hsl, var(--color-primary) 12%, transparent) 0%,
    transparent 70%
  );
}

.gradient-orb-2 {
  bottom: -30%;
  left: -20%;
  width: 50vw;
  height: 50vw;
  max-width: 600px;
  max-height: 600px;
  background: radial-gradient(
    circle,
    color-mix(in hsl, var(--color-secondary) 8%, transparent) 0%,
    transparent 70%
  );
}

.accent-line {
  position: absolute;
  top: 30%;
  left: 0;
  width: 200%;
  height: 2px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--color-primary) 50%,
    transparent 100%
  );
  transform: rotate(-5deg);
  opacity: 0.1;
}

/* ==========================================================================
   Site Wrapper & Layout
   ========================================================================== */

.site-wrapper {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.main-content {
  flex: 1;
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
  padding: 0 var(--spacing-4);
}

/* ==========================================================================
   Header
   ========================================================================== */

.site-header {
  padding: var(--spacing-5) var(--spacing-4);
  display: flex;
  justify-content: center;
}

.site-logo {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  font-size: var(--size-title-3);
  font-weight: 700;
  color: var(--color-text);
  transition: color 0.2s ease;
}

.site-logo:hover {
  color: var(--color-primary);
}

.site-logo svg {
  width: 32px;
  height: auto;
  fill: var(--color-primary);
}

/* ==========================================================================
   Home Page Hero
   ========================================================================== */

.home-hero {
  padding: var(--spacing-6) 0 var(--spacing-8);
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  font-size: var(--size-callout);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-primary);
  margin-bottom: var(--spacing-4);
}

.hero-eyebrow svg {
  width: 1em;
  height: auto;
  fill: var(--color-primary);
}

.hero-title {
  font-size: var(--size-display);
  font-weight: 800;
  line-height: 0.95;
  letter-spacing: -0.03em;
  color: var(--color-text);
  margin-bottom: var(--spacing-4);
}

.hero-subtitle {
  font-size: var(--size-title-3);
  line-height: 1.6;
  color: var(--color-text-light);
  max-width: 600px;
}

/* ==========================================================================
   Posts Grid
   ========================================================================== */

.posts-section {
  padding-bottom: var(--spacing-8);
}

.posts-grid {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-4);
}

.post-card {
  display: block;
  background: var(--color-highlight);
  border-radius: var(--radius-lg);
  padding: var(--spacing-5);
  transition: background-color 0.2s ease, transform 0.2s ease;
}

.post-card:hover {
  background: var(--color-highlight-light);
  transform: translateY(-2px);
}

.card-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  font-size: var(--size-footnote);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-3);
}

.card-separator {
  color: var(--color-primary);
}

.card-title {
  font-size: var(--size-title-1);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin-bottom: var(--spacing-3);
  transition: color 0.2s ease;
}

.post-card:hover .card-title {
  color: var(--color-primary);
}

.card-excerpt {
  font-size: var(--size-body);
  line-height: 1.7;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-4);
}

.card-link {
  display: inline-flex;
  align-items: center;
  font-size: var(--size-callout);
  font-weight: 700;
  color: var(--color-primary);
  transition: opacity 0.2s ease;
}

.post-card:hover .card-link {
  opacity: 0.8;
}

/* ==========================================================================
   Post Layout
   ========================================================================== */

.post {
  /* No animation for better reading experience */
}

/* Post Hero */
.post-hero {
  padding: var(--spacing-4) 0 var(--spacing-6);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  font-size: var(--size-callout);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-primary);
  margin-bottom: var(--spacing-5);
  transition: opacity 0.2s ease;
}

.back-link:hover {
  opacity: 0.7;
}

.back-arrow {
  transition: transform 0.2s ease;
}

.back-link:hover .back-arrow {
  transform: translateX(-4px);
}

.post-meta-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  padding: var(--spacing-2) var(--spacing-3);
  background: color-mix(in hsl, var(--color-primary) 15%, transparent);
  border-left: 3px solid var(--color-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: var(--size-footnote);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text);
  margin-bottom: var(--spacing-4);
}

.meta-separator {
  color: var(--color-primary);
}

.post-title {
  font-size: var(--size-display);
  font-weight: 800;
  line-height: 0.95;
  letter-spacing: -0.03em;
  color: var(--color-text);
}

/* Post Body */
.post-body {
  background: var(--color-highlight);
  border-radius: var(--radius-lg);
  padding: var(--spacing-6);
}

/* Post Content Typography */
.post-body > *:first-child {
  margin-top: 0;
}

.post-body p {
  font-size: var(--size-body);
  line-height: 1.8;
  color: var(--color-text);
  margin-bottom: var(--spacing-4);
}

.post-body h2 {
  font-size: var(--size-title-1);
  font-weight: 800;
  color: var(--color-text);
  margin-top: var(--spacing-8);
  margin-bottom: var(--spacing-4);
  letter-spacing: -0.02em;
  padding-top: var(--spacing-5);
  border-top: 1px solid color-mix(in hsl, var(--color-primary) 20%, transparent);
}

.post-body h2:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}

.post-body h3 {
  font-size: var(--size-title-2);
  font-weight: 700;
  color: var(--color-text);
  margin-top: var(--spacing-6);
  margin-bottom: var(--spacing-3);
}

.post-body a {
  color: var(--color-primary);
  font-weight: 600;
  transition: opacity 0.2s ease;
}

.post-body a:hover {
  opacity: 0.8;
}

.post-body strong {
  font-weight: 700;
  color: var(--color-text);
}

.post-body em {
  color: var(--color-text);
}

.post-body ul,
.post-body ol {
  margin-bottom: var(--spacing-4);
  padding-left: var(--spacing-3);
}

.post-body li {
  margin-bottom: var(--spacing-2);
  padding-left: var(--spacing-2);
  color: var(--color-text);
}

.post-body li::marker {
  color: var(--color-primary);
}

.post-body blockquote {
  margin: var(--spacing-5) 0;
  padding: var(--spacing-4);
  background: var(--color-bg);
  border-left: 3px solid var(--color-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.post-body blockquote p:last-child {
  margin-bottom: 0;
}

.post-body code {
  font-family: 'SF Mono', ui-monospace, monospace;
  font-size: 0.9em;
  background: var(--color-bg);
  padding: 0.2em 0.5em;
  border-radius: var(--spacing-1);
  color: var(--color-secondary);
}

.post-body pre {
  margin: var(--spacing-5) 0;
  padding: var(--spacing-4);
  background: var(--color-bg);
  border-radius: var(--radius-sm);
  overflow-x: auto;
}

.post-body pre code {
  background: none;
  padding: 0;
  font-size: var(--size-callout);
  line-height: 1.6;
}

.post-body img {
  margin: var(--spacing-5) 0;
  border-radius: var(--radius-sm);
}

.post-body hr {
  border: none;
  height: 1px;
  background: color-mix(in hsl, var(--color-primary) 25%, transparent);
  margin: var(--spacing-7) 0;
}

/* Post CTA */
.post-cta {
  margin-top: var(--spacing-6);
  margin-bottom: var(--spacing-8);
  padding: var(--spacing-6);
  background: linear-gradient(
    135deg,
    color-mix(in hsl, var(--color-primary) 12%, var(--color-bg)),
    color-mix(in hsl, var(--color-secondary) 8%, var(--color-bg))
  );
  border: 1px solid color-mix(in hsl, var(--color-primary) 25%, transparent);
  border-radius: var(--radius-lg);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.post-cta::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 400px;
  height: 400px;
  background: radial-gradient(
    circle,
    color-mix(in hsl, var(--color-primary) 10%, transparent) 0%,
    transparent 70%
  );
  pointer-events: none;
}

.cta-content {
  position: relative;
  z-index: 1;
}

.cta-badge {
  display: inline-block;
  padding: var(--spacing-1) var(--spacing-3);
  background: var(--color-highlight);
  border: 1px solid color-mix(in hsl, var(--color-primary) 30%, transparent);
  border-radius: 999px;
  font-size: var(--size-footnote);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-primary);
  margin-bottom: var(--spacing-3);
}

.cta-text {
  font-size: var(--size-title-3);
  color: var(--color-text-light);
  margin-bottom: var(--spacing-4);
}

.cta-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-3) var(--spacing-6);
  background: var(--color-primary);
  color: var(--color-text);
  font-size: var(--size-body);
  font-weight: 700;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
  box-shadow:
    inset -1px -1px 0px rgba(255,255,255,0.1),
    inset 1px 1px 0px rgba(255,255,255,0.1),
    0 4px 16px color-mix(in hsl, var(--color-primary) 50%, black);
}

.cta-button:hover {
  transform: translateY(-2px);
  box-shadow:
    inset -1px -1px 0px rgba(255,255,255,0.15),
    inset 1px 1px 0px rgba(255,255,255,0.15),
    0 6px 24px color-mix(in hsl, var(--color-primary) 60%, black);
}

/* ==========================================================================
   Empty State
   ========================================================================== */

.empty-state {
  text-align: center;
  padding: var(--spacing-10);
  background: var(--color-highlight);
  border-radius: var(--radius-lg);
}

.empty-state h2 {
  font-size: var(--size-title-2);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--spacing-2);
}

.empty-state p {
  font-size: var(--size-body);
  color: var(--color-text-muted);
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  margin-top: auto;
  padding: var(--spacing-8) var(--spacing-4);
  background: var(--color-highlight);
  position: relative;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    color-mix(in hsl, var(--color-primary) 30%, transparent) 15%,
    var(--color-primary) 50%,
    color-mix(in hsl, var(--color-primary) 30%, transparent) 85%,
    transparent 100%
  );
}

.footer-content {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-3);
}

.footer-logo {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  font-size: var(--size-callout);
  font-weight: 700;
  color: var(--color-text-muted);
  transition: color 0.2s ease;
}

.footer-logo:hover {
  color: var(--color-primary);
}

.footer-logo svg {
  width: 20px;
  height: auto;
  fill: var(--color-primary);
}

.footer-links {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
}

.footer-links a {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-1);
  font-size: var(--size-callout);
  color: var(--color-text-light);
  font-weight: 500;
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: var(--color-primary);
}

.footer-links a svg {
  width: 1em;
  height: 1em;
}

.footer-links .separator {
  color: var(--color-text-muted);
}

.footer-tagline {
  font-size: var(--size-footnote);
  color: var(--color-text-muted);
  font-weight: 600;
  letter-spacing: 0.02em;
}

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 640px) {
  .main-content {
    padding: 0 var(--spacing-3);
  }

  .home-hero {
    padding: var(--spacing-4) 0 var(--spacing-6);
  }

  .hero-title {
    font-size: clamp(2rem, 10vw, 2.5rem);
    line-height: 1;
  }

  .post-card {
    padding: var(--spacing-4);
    border-radius: var(--radius-md);
  }

  .post-body {
    padding: var(--spacing-4);
    border-radius: var(--radius-md);
  }

  .post-cta {
    padding: var(--spacing-4);
    border-radius: var(--radius-md);
  }

  .post-title {
    font-size: clamp(2rem, 10vw, 2.5rem);
    line-height: 1;
  }
}