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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  background-color: var(--bg-base);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  position: relative;
  /* Subtle Engineering Grid background */
  background-image: 
    linear-gradient(to right, rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 48px 48px;
}

/* Custom Sleek Scrollbar */
::-webkit-scrollbar {
  width: 7px;
}
::-webkit-scrollbar-track {
  background: var(--bg-base);
}
::-webkit-scrollbar-thumb {
  background: #1e2330;
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: #2b3244;
}

/* Skip Navigation for Accessibility */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1.5rem;
  background: var(--accent);
  color: var(--accent-contrast);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  padding: 0.6rem 1.25rem;
  z-index: 9999;
  text-decoration: none;
  border-radius: var(--radius-xs);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 1.5rem;
}

/* Technical Typography Hierarchy */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.035em;
}

h1 {
  font-size: clamp(2.4rem, 5.5vw, 4.25rem);
  letter-spacing: -0.045em;
  font-weight: 800;
}

h2 {
  font-size: clamp(1.75rem, 3.5vw, 2.6rem);
  letter-spacing: -0.035em;
  font-weight: 700;
}

h3 {
  font-size: clamp(1.2rem, 2vw, 1.5rem);
  letter-spacing: -0.025em;
  font-weight: 600;
}

h4 {
  font-size: 1.0625rem;
  letter-spacing: -0.015em;
  font-weight: 600;
}

p {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.65;
  margin-bottom: 1.25rem;
}

p.lead {
  font-size: clamp(1.0625rem, 1.8vw, 1.25rem);
  line-height: 1.55;
  color: var(--text-primary);
  font-weight: 400;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

code, kbd, samp, pre {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
}

.code-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xs);
  padding: 0.2rem 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.775rem;
  color: var(--accent);
}

/* Layout Containers */
.container {
  width: 100%;
  max-width: var(--max-width-content);
  margin-left: auto;
  margin-right: auto;
  padding-left: clamp(1.25rem, 4vw, 2.5rem);
  padding-right: clamp(1.25rem, 4vw, 2.5rem);
}

.container-narrow {
  width: 100%;
  max-width: var(--max-width-narrow);
  margin-left: auto;
  margin-right: auto;
  padding-left: clamp(1.25rem, 4vw, 2.5rem);
  padding-right: clamp(1.25rem, 4vw, 2.5rem);
}

.section {
  padding-top: clamp(3.5rem, 7vw, 5.5rem);
  padding-bottom: clamp(3.5rem, 7vw, 5.5rem);
  position: relative;
}

.section-border-top {
  border-top: 1px solid var(--border-subtle);
}

.section-border-bottom {
  border-bottom: 1px solid var(--border-subtle);
}

/* Modern Technical Metadata Tags & Badges */
.meta-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
  font-weight: 500;
}

.meta-tag-accent {
  color: var(--accent);
}

.meta-tag-pill {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  border-radius: 9999px;
  padding: 0.25rem 0.75rem;
  font-size: 0.6875rem;
}

.live-indicator {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--accent);
  box-shadow: 0 0 8px var(--accent);
  animation: pulse-glow 2.5s infinite ease-in-out;
}

@keyframes pulse-glow {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.35; transform: scale(0.85); }
}

/* Selection */
::selection {
  background-color: var(--accent);
  color: var(--accent-contrast);
}