/* ==========================================================================
   AdaEva 8-Bit Research Design System — Design Tokens & Foundations
   Inspired by the warm-editorial retro-computing aesthetic of Mistral AI
   ========================================================================== */

:root {
  /* Warm Canvas & Surface Palette */
  --bg-canvas: #FAF8F5;
  --bg-canvas-subtle: #F3EFEA;
  --bg-surface: #FFFFFF;
  --bg-surface-elevated: #FFFDFB;
  --bg-surface-sunken: #ECE6DD;
  --bg-terminal: #141312;
  --bg-terminal-inner: #1C1B19;

  /* Ink & Typography */
  --text-primary: #121110;
  --text-secondary: #57524C;
  --text-muted: #827B73;
  --text-inverse: #FAF8F5;
  --text-terminal: #E6E1D8;
  --text-terminal-muted: #9E978E;

  /* Borders & Rules */
  --border-dark: #121110;
  --border-medium: #C8C0B4;
  --border-subtle: #E2DBD0;
  --border-light: #EDE7DC;

  /* Mistral & Research Accent Palette */
  --accent-orange: #FF5500;
  --accent-orange-hover: #E04B00;
  --accent-orange-bg: #FFF3EB;
  --accent-orange-border: #FF5500;

  --accent-amber: #D97706;
  --accent-amber-light: #F59E0B;
  --accent-amber-bg: #FEF8EC;
  --accent-amber-border: #F59E0B;

  --accent-red: #DC2626;
  --accent-red-light: #EF4444;
  --accent-red-bg: #FEF2F2;
  --accent-red-border: #DC2626;

  --accent-green: #15803D;
  --accent-green-light: #16A34A;
  --accent-green-bg: #F0FDF4;
  --accent-green-border: #16A34A;

  --accent-blue: #1D4ED8;
  --accent-blue-light: #3B82F6;
  --accent-blue-bg: #EFF6FF;
  --accent-blue-border: #2563EB;

  /* 8-Bit Stepped Pixel Shadows */
  --shadow-pixel-sm: 2px 2px 0px var(--border-dark);
  --shadow-pixel-md: 3px 3px 0px var(--border-dark);
  --shadow-pixel-lg: 5px 5px 0px var(--border-dark);
  --shadow-pixel-xl: 7px 7px 0px var(--border-dark);
  --shadow-pixel-orange: 3px 3px 0px var(--accent-orange);
  --shadow-pixel-amber: 3px 3px 0px var(--accent-amber);
  --shadow-pixel-red: 3px 3px 0px var(--accent-red);
  --shadow-pixel-green: 3px 3px 0px var(--accent-green);

  /* Typography Stack - Unified Inter for Body & Headings */
  --font-display: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'IBM Plex Mono', 'Menlo', 'Consolas', monospace;
  --font-pixel: 'Silkscreen', 'JetBrains Mono', monospace;

  /* Layout & Sizing */
  --max-width-wide: 1240px;
  --max-width-content: 1080px;
  --max-width-narrow: 760px;
  --radius-sharp: 0px;
  --radius-subtle: 2px;
  --nav-height: 64px;
}

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

html {
  font-family: var(--font-body);
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  font-size: 16px;
  line-height: 1.6;
  scroll-behavior: smooth;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  max-width: 100vw;
  overflow-x: clip;
}

body {
  min-height: 100vh;
  position: relative;
  overflow-x: clip;
  max-width: 100vw;
  padding-top: var(--nav-height);
  background-color: var(--bg-canvas);
  background-image: radial-gradient(var(--border-subtle) 1px, transparent 1px);
  background-size: 24px 24px;
}


/* Skip Link for Accessibility */
.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  background: var(--accent-orange);
  color: #fff;
  padding: 8px 16px;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  z-index: 9999;
  border: 2px solid var(--border-dark);
  box-shadow: var(--shadow-pixel-md);
  text-decoration: none;
  transition: top 0.15s ease;
}

.skip-link:focus {
  top: 16px;
}

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

/* Typography Helpers */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.025em;
  color: var(--text-primary);
}

p {
  color: var(--text-secondary);
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.15s ease;
}

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

/* Pixel Accents & Utilities */
.pixel-box {
  background: var(--bg-surface);
  border: 2px solid var(--border-dark);
  box-shadow: var(--shadow-pixel-md);
  position: relative;
}

.pixel-box--orange {
  border-color: var(--border-dark);
  box-shadow: var(--shadow-pixel-orange);
}

.pixel-box--dark {
  background: var(--bg-terminal);
  color: var(--text-terminal);
  border: 2px solid var(--border-dark);
  box-shadow: var(--shadow-pixel-md);
}

/* Corner Bracket Accents (Mistral-inspired modular brackets) */
.pixel-corners {
  position: relative;
}

.pixel-corners::before,
.pixel-corners::after {
  content: '';
  position: absolute;
  width: 6px;
  height: 6px;
  pointer-events: none;
  z-index: 2;
}

.pixel-corners::before {
  top: -2px;
  left: -2px;
  border-top: 2px solid var(--accent-orange);
  border-left: 2px solid var(--accent-orange);
}

.pixel-corners::after {
  bottom: -2px;
  right: -2px;
  border-bottom: 2px solid var(--accent-orange);
  border-right: 2px solid var(--accent-orange);
}

/* Eyebrow Label */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-orange);
  margin-bottom: 12px;
}

.eyebrow-dark {
  color: var(--text-primary);
}

/* Live Pixel Indicator Dot */
.pixel-dot {
  width: 8px;
  height: 8px;
  background-color: var(--accent-orange);
  display: inline-block;
  box-shadow: 1px 1px 0px var(--border-dark);
  animation: pixelPulse 1.8s infinite steps(2);
}

@keyframes pixelPulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.25; transform: scale(0.9); }
}

/* Standard Pixel Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  text-decoration: none;
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 2px solid var(--border-dark);
  box-shadow: var(--shadow-pixel-md);
  cursor: pointer;
  transition: transform 0.1s ease, box-shadow 0.1s ease, background 0.15s ease;
  user-select: none;
  position: relative;
}

.btn:hover:not(:disabled) {
  transform: translate(-1px, -1px);
  box-shadow: var(--shadow-pixel-lg);
  background: var(--bg-canvas-subtle);
}

.btn:active:not(:disabled) {
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0px var(--border-dark);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  box-shadow: 1px 1px 0px var(--border-dark);
  transform: none;
}

.btn--primary {
  background: var(--accent-orange);
  color: #FFFFFF;
  border-color: var(--border-dark);
}

.btn--primary:hover:not(:disabled) {
  background: var(--accent-orange-hover);
  color: #FFFFFF;
}

.btn--small {
  padding: 6px 12px;
  font-size: 0.8125rem;
  box-shadow: var(--shadow-pixel-sm);
}

.btn--small:hover:not(:disabled) {
  box-shadow: var(--shadow-pixel-md);
}

.btn--dark {
  background: var(--bg-terminal);
  color: var(--text-terminal);
}

/* Section Header Structure */
.section, .hero, section[id] {
  scroll-margin-top: calc(var(--nav-height) + 16px - 36px);
}

.section {
  max-width: var(--max-width-content);
  margin: 0 auto;
  padding: 36px 24px 60px;
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 24px;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--border-dark);
}

.section-head h2 {
  font-size: clamp(1.85rem, 3.5vw, 2.75rem);
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.intro {
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
  line-height: 1.6;
  color: var(--text-secondary);
  width: 100%;
  max-width: 100%;
  margin-bottom: 36px;
}

.caption {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-top: 18px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 640px) {
  .section, .hero, section[id] {
    scroll-margin-top: calc(var(--nav-height) + 12px - 28px);
  }
  .section {
    padding: 28px 16px 44px;
  }
  .section-head {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
  .section-head h2 {
    font-size: clamp(1.4rem, 6.5vw, 1.95rem);
    word-break: break-word;
  }
  .eyebrow {
    font-size: 0.75rem;
    flex-wrap: wrap;
    gap: 6px;
  }
}