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

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

body {
  font-family: var(--font-primary);
  background-color: var(--bg-main);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  min-height: 100vh;
  position: relative;
}

/* Background Tech Grid Pattern */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-image: 
    linear-gradient(to right, var(--border-subtle) 1px, transparent 1px),
    linear-gradient(to bottom, var(--border-subtle) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(circle at 50% 50%, rgba(0, 0, 0, 0.4) 0%, rgba(0, 0, 0, 0.05) 80%, transparent 100%);
  -webkit-mask-image: radial-gradient(circle at 50% 50%, rgba(0, 0, 0, 0.4) 0%, rgba(0, 0, 0, 0.05) 80%, transparent 100%);
  pointer-events: none;
  z-index: 0;
}

::selection {
  background-color: var(--accent-primary);
  color: var(--text-inverse);
}

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

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

button {
  font-family: inherit;
  font-size: inherit;
  border: none;
  background: none;
  cursor: pointer;
}

ul, ol {
  list-style: none;
}

/* Typography Hierarchy */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.15;
  color: var(--text-primary);
  letter-spacing: -0.025em;
}

h1 {
  font-size: clamp(2.5rem, 5.5vw, 4.25rem);
  font-weight: 800;
  letter-spacing: -0.035em;
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  letter-spacing: -0.03em;
}

h3 {
  font-size: clamp(1.35rem, 2.5vw, 1.85rem);
  letter-spacing: -0.02em;
}

h4 {
  font-size: 1.25rem;
  font-weight: 600;
}

p {
  color: var(--text-secondary);
  font-size: 1.0625rem;
  line-height: 1.7;
}

p.lead {
  font-size: clamp(1.15rem, 2vw, 1.35rem);
  line-height: 1.6;
  color: var(--text-primary);
}

.mono {
  font-family: var(--font-mono);
}

/* Container */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-xl);
  padding-right: var(--space-xl);
  position: relative;
  z-index: 1;
}

.section {
  padding-top: var(--space-4xl);
  padding-bottom: var(--space-4xl);
  position: relative;
  z-index: 1;
}

/* Section Header - Editorial Style */
.section-header {
  margin-bottom: var(--space-3xl);
  max-width: 860px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent-primary);
  background: rgba(0, 229, 153, 0.08);
  border: 1px solid rgba(0, 229, 153, 0.2);
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-md);
}

.section-tag::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--accent-primary);
  box-shadow: 0 0 8px var(--accent-primary);
}

.section-title {
  margin-bottom: var(--space-md);
}

.section-desc {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* Text Gradient Highlight */
.text-gradient {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.text-muted {
  color: var(--text-tertiary);
}

/* Focus state for accessibility */
:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 3px;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-main);
}

::-webkit-scrollbar-thumb {
  background: var(--border-medium);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-tertiary);
}