portfolio/src/shared/styles/theme.css

:root {
  /* === TYPOGRAPHY SCALE (Augmented Fourth 1.414) === */
  --font-size: 16px;
  --text-xs: 0.707rem;
  --text-sm: 0.84rem;
  --text-base: 1rem;
  --text-lg: 1.414rem;
  --text-xl: 2rem;
  --text-2xl: 2.828rem;
  --text-3xl: 4rem;
  --text-4xl: 5.657rem;
  --text-5xl: 8rem;

  /* === FONT FAMILIES (set by next/font CSS vars in layout.tsx) === */
  --font-heading: var(--font-fraunces), serif;
  --font-body: var(--font-public-sans), sans-serif;

  /* === FONT WEIGHTS === */
  --font-weight-heading: 900;
  --font-weight-body: 600;
  --font-weight-normal: 400;

  /* === LINE HEIGHT === */
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;

  /* === FRAUNCES VARIABLE AXES === */
  --fraunces-wonk: 1;
  --fraunces-soft: 0;

  /* === COLOR PALETTE: 2-color system === */
  --cream: #f4f0e8;
  --blue: #041cf3;

  /* === SEMANTIC COLORS === */
  --background: var(--cream);
  --foreground: var(--blue);
  --card: var(--cream);
  --card-foreground: var(--blue);
  --primary: var(--blue);
  --primary-foreground: var(--cream);
  --secondary: var(--cream);
  --secondary-foreground: var(--blue);
  --muted: var(--cream);
  --muted-foreground: rgba(4, 28, 243, 0.5);
  --accent: var(--blue);
  --accent-foreground: var(--cream);
  --destructive: var(--blue);
  --border: var(--blue);
  --ring: var(--blue);

  /* === SPACING (8pt Linear Scale) === */
  --space-0: 0;
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-5: 2.5rem;
  --space-6: 3rem;
  --space-7: 3.5rem;
  --space-8: 4rem;
  --space-10: 5rem;
  --space-12: 6rem;
  --space-16: 8rem;
  --space-20: 10rem;

  /* === BORDERS === */
  --border-width: 3px;
  --radius: 0px;

  /* === BRUTALIST SHADOWS === */
  --shadow-brutal: 8px 8px 0 var(--blue);
  --shadow-brutal-sm: 4px 4px 0 var(--blue);
  --shadow-brutal-lg: 12px 12px 0 var(--blue);

  /* === GRID === */
  --grid-gap: var(--space-3);

  /* === ANIMATION === */
  --ease-default: ease;
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-decelerate: cubic-bezier(0.25, 0, 0, 1);
  --duration-fast: 100ms;
  --duration-normal: 200ms;
  --duration-slow: 350ms;
  --duration-spring: 380ms;
}

@theme inline {
  --font-heading: var(--font-fraunces);
  --font-body: var(--font-public-sans);

  --color-cream: var(--cream);
  --color-blue: var(--blue);
  --color-background: var(--background);
  --color-foreground: var(--foreground);
  --color-primary: var(--primary);
  --color-primary-foreground: var(--primary-foreground);
  --color-secondary: var(--secondary);
  --color-secondary-foreground: var(--secondary-foreground);
  --color-muted: var(--muted);
  --color-muted-foreground: var(--muted-foreground);
  --color-accent: var(--accent);
  --color-accent-foreground: var(--accent-foreground);
  --color-destructive: var(--destructive);
  --color-card: var(--card);
  --color-card-foreground: var(--card-foreground);
  --color-ring: var(--ring);
  --color-border: var(--border);
  --radius-sm: var(--radius);
  --radius-md: var(--radius);
  --radius-lg: var(--radius);
}

@layer base {
  * {
    @apply border-border;
  }

  html {
    font-size: var(--font-size);
  }

  body {
    @apply bg-background text-foreground;
    font-family: var(--font-body);
    font-weight: var(--font-weight-body);
    line-height: var(--line-height-tight);
    overflow-x: hidden;
  }

  /* Subtle blue-tinted grain on parchment */
  body::before {
    content: "";
    position: fixed;
    inset: 0;
    background-image:
      repeating-linear-gradient(
        0deg,
        transparent,
        transparent 2px,
        rgba(4, 28, 243, 0.015) 2px,
        rgba(4, 28, 243, 0.015) 4px
      ),
      repeating-linear-gradient(
        90deg,
        transparent,
        transparent 2px,
        rgba(4, 28, 243, 0.015) 2px,
        rgba(4, 28, 243, 0.015) 4px
      );
    opacity: 0.6;
    display: block;
    pointer-events: none;
    z-index: 1;
  }

  h1,
  h2,
  h3,
  h4,
  h5,
  h6 {
    font-family: var(--font-heading);
    font-weight: var(--font-weight-heading);
    line-height: var(--line-height-tight);
    font-variation-settings:
      "WONK" var(--fraunces-wonk),
      "SOFT" var(--fraunces-soft);
    color: var(--blue);
  }

  h1 {
    font-size: var(--text-4xl);
  }
  h2 {
    font-size: var(--text-3xl);
  }
  h3 {
    font-size: var(--text-2xl);
  }
  h4 {
    font-size: var(--text-xl);
  }
  h5 {
    font-size: var(--text-lg);
  }

  p {
    font-family: var(--font-body);
    font-size: var(--text-base);
    font-weight: var(--font-weight-body);
    color: var(--blue);
  }

  a {
    color: var(--blue);
    text-decoration: none;
    border-bottom: 2px solid var(--blue);
    transition: all 0.2s;
  }

  a:hover {
    border-bottom-width: 4px;
  }

  blockquote {
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    border-left: var(--border-width) solid var(--blue);
    padding-left: var(--space-4);
    margin: var(--space-6) 0;
  }
}

/* Brutalist utility classes */
.brutal-shadow {
  box-shadow: var(--shadow-brutal);
}
.brutal-shadow-sm {
  box-shadow: var(--shadow-brutal-sm);
}
.brutal-shadow-lg {
  box-shadow: var(--shadow-brutal-lg);
}
.brutal-border {
  border: var(--border-width) solid var(--blue);
}
.brutal-border-top {
  border-top: var(--border-width) solid var(--blue);
}
.brutal-border-bottom {
  border-bottom: var(--border-width) solid var(--blue);
}
.brutal-border-left {
  border-left: var(--border-width) solid var(--blue);
}
.brutal-border-right {
  border-right: var(--border-width) solid var(--blue);
}

/* Section content enter animation (initial render, no navigation) */
.section-content {
  opacity: 1;
  transform: translateY(0);
  transition:
    opacity var(--duration-slow) var(--ease-default),
    transform var(--duration-slow) var(--ease-default);
}

@starting-style {
  .section-content {
    opacity: 0;
    transform: translateY(12px);
  }
}

/* Cross-section view transition (navigation between sections) */
::view-transition-old(section-content) {
  animation-name: section-fade-out;
  animation-duration: var(--duration-normal);
  animation-timing-function: var(--ease-default);
  animation-fill-mode: both;
}

::view-transition-new(section-content) {
  animation-name: section-fade-in;
  animation-duration: var(--duration-spring);
  animation-timing-function: var(--ease-spring);
  animation-fill-mode: both;
}

@keyframes section-fade-out {
  from {
    opacity: 1;
    transform: translateY(0);
  }
  to {
    opacity: 0;
    transform: translateY(-8px);
  }
}

@keyframes section-fade-in {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Section body: instant blur-out, clean slide-in */
::view-transition-old(section-body) {
  animation-name: section-body-out;
  animation-duration: var(--duration-fast);
  animation-timing-function: var(--ease-default);
  animation-fill-mode: both;
}

::view-transition-new(section-body) {
  animation-name: section-body-in;
  animation-duration: var(--duration-slow);
  animation-delay: var(--duration-normal);
  animation-timing-function: var(--ease-decelerate);
  animation-fill-mode: both;
}

@keyframes section-body-out {
  from {
    opacity: 1;
    filter: blur(0);
  }
  to {
    opacity: 0;
    filter: blur(3px);
  }
}

@keyframes section-body-in {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}