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;

  /* Fluid section title: scales from 2rem at ~267px to 8rem at ~1707px */
  --text-section-title: clamp(2rem, 7.5vw, 8rem);

  /* === LINE HEIGHT === */
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.65;

  /* === 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-xs: 1px 1px 0 var(--blue);
  --shadow-brutal-sm: 3px 3px 0 var(--blue);
  --shadow-brutal: 5px 5px 0 var(--blue);
  --shadow-brutal-md: 7px 7px 0 var(--blue);
  --shadow-brutal-lg: 8px 8px 0 var(--blue);
  --shadow-brutal-xl: 10px 10px 0 var(--blue);
  --shadow-brutal-2xl: 12px 12px 0 var(--blue);

  /* === GRID === */
  --grid-gap: var(--space-3);
  --section-content-width: 72rem;

  /* === ANIMATION === */
  --ease-default: ease;
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-decelerate: cubic-bezier(0.25, 0, 0, 1);
  --ease-micro: cubic-bezier(0.22, 1, 0.36, 1);
  --duration-fast: 100ms;
  --duration-normal: 150ms;
  --duration-slow: 350ms;
  --duration-spring: 220ms;
  --delay-normal: 200ms;
  --slide-section-body-in: clamp(1.25rem, 5vw, 3rem);
}

@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);
  --container-section: var(--section-content-width);
  --spacing-footer: 5rem;
  --spacing-footer-wide: 4rem;
  --text-section-title: var(--text-section-title);

  --shadow-brutal-xs: var(--shadow-brutal-xs);
  --shadow-brutal-sm: var(--shadow-brutal-sm);
  --shadow-brutal: var(--shadow-brutal);
  --shadow-brutal-md: var(--shadow-brutal-md);
  --shadow-brutal-lg: var(--shadow-brutal-lg);
  --shadow-brutal-xl: var(--shadow-brutal-xl);
  --shadow-brutal-2xl: var(--shadow-brutal-2xl);
}

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

  ::selection {
    background-color: var(--blue);
    color: var(--cream);
  }

  :focus-visible {
    outline: var(--border-width) solid var(--blue);
    outline-offset: 2px;
  }

  html {
    font-size: var(--font-size);
    scroll-behavior: smooth;
    /* Reserve scrollbar gutter so locking body scroll (e.g. when a modal
     * opens) doesn't widen the viewport and shift fixed elements. */
    scrollbar-gutter: stable;
  }

  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;
  }

  /* Page-wide blue dot grain overlay. z-index 100 puts it above the footer
   * (z-50) so the grain reads as continuous across the entire viewport;
   * pointer-events: none keeps everything clickable through it. */
  body::before {
    @apply grain-pattern;
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 100;
  }

  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;
  }

  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;
  }
}

/* Button elevation transition — only transform animates; shadow snaps instantly */
.btn-transition {
  transition: transform 0.13s var(--ease-micro);
}

/* 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);
}
@utility brutal-border {
  border: var(--border-width) solid var(--blue);
}
@utility brutal-border-top {
  border-top: var(--border-width) solid var(--blue);
}
@utility brutal-border-bottom {
  border-bottom: var(--border-width) solid var(--blue);
}
@utility brutal-border-left {
  border-left: var(--border-width) solid var(--blue);
}
@utility brutal-border-right {
  border-right: var(--border-width) solid var(--blue);
}
/* Border drawn as an outline — painted after children, so an image's
 * subpixel paint bleed can't cover it. Doesn't take layout space; the
 * ancestor must not have overflow:hidden or the outline gets clipped. */
@utility brutal-outline {
  outline: var(--border-width) solid var(--blue);
}
/* Tiled blue dot pattern — applied to body::before (page-wide) and reusable
 * on any surface that should share the same paper-grain texture. The SVG
 * tile is rasterized once and composited cheaply via repeating background. */
@utility grain-pattern {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='4' height='4'%3E%3Ccircle cx='1' cy='1' r='1' fill='%23041cf3' opacity='0.10'/%3E%3C/svg%3E");
}
/* Apply Fraunces variable axes to non-heading elements using the heading font */
.font-wonk {
  font-variation-settings:
    "WONK" var(--fraunces-wonk),
    "SOFT" var(--fraunces-soft);
}

/* Sidebar divider: bottom border on mobile, right border on desktop */
.brutal-border-sidebar {
  border-bottom: var(--border-width) solid var(--blue);
}
@media (min-width: 1024px) {
  .brutal-border-sidebar {
    border-bottom: none;
    border-right: var(--border-width) solid var(--blue);
  }
}

/* Editorial rich-text typography */
.rich-text {
  max-width: 65ch;
  line-height: var(--line-height-relaxed);
  font-feature-settings: "onum";
  hanging-punctuation: first last;
  text-wrap: pretty;
}

.rich-text a {
  border-bottom: var(--border-width) solid var(--blue);
  opacity: 1;
  transition: opacity var(--duration-normal);
}

.rich-text a:hover {
  opacity: 0.6;
}

.rich-text p + p {
  margin-top: 1.2em;
}

.rich-text ul {
  list-style: none;
  padding-left: 0;
  margin: 1em 0;
}

.rich-text ul li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.65em;
  align-items: start;
  margin-top: 0.5em;
}

.rich-text ul li:first-child {
  margin-top: 0;
}

.rich-text ul li::before {
  content: "◆";
  color: var(--blue);
  font-size: 0.55em;
  /* line-height matches parent so diamond centers within the first line box */
  line-height: calc(var(--line-height-relaxed) / 0.55);
}

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

::view-transition-new(section-title) {
  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);
  }
}

/* Disable group geometry interpolation — OLD and NEW live at different scroll
 * positions, so morphing the container drags the slide-in across the viewport.
 * Let old/new each animate at their own positions instead. */
::view-transition-group(section-body) {
  animation: none;
}

/* Section body — snap OLD out and slide NEW in. Running an explicit OLD
 * animation left a visible ghost of the previous section's content sitting
 * behind the incoming slide; hiding it immediately keeps the transition
 * clean and prevents the two-content overlap. */
::view-transition-old(section-body) {
  animation: none;
  opacity: 0;
}

::view-transition-new(section-body) {
  animation-name: section-body-in;
  animation-duration: var(--duration-spring);
  animation-timing-function: var(--ease-spring);
  animation-fill-mode: both;
  /* Hold the start-state for this delay before the slide-in begins — gives
   * the snap-out a beat to register visually before new content arrives. */
  animation-delay: var(--delay-normal);
}

@keyframes section-body-in {
  from {
    opacity: 0;
    transform: translateX(var(--slide-section-body-in)) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateX(0) scale(1);
  }
}

/* Page-load entry animation for the footer. Previously also carried
 * `view-transition-name: site-footer` to layer above section-body's slide
 * group, but the section-body group now has `animation: none` (purely
 * horizontal slide of OLD/NEW snapshots), so the footer can live in the root
 * snapshot during transitions — which also lets the lightbox dialog group
 * stack cleanly above it. */
.footer-vt {
  animation: footer-enter var(--duration-slow) var(--ease-spring) both;
}

@keyframes footer-enter {
  from {
    opacity: 0;
    transform: translateY(100%);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Lightbox dialog backdrop — flat cream wash. No filter, no gradient.
 * Cheapest possible; Firefox-friendly during view transitions. */
dialog.lightbox::backdrop {
  background-color: color-mix(in srgb, var(--cream) 80%, transparent);
}

/* Give the lightbox dialog its own view-transition group so it can stack
 * above the footer's named group (z=10) during the open/close transition.
 * Closed dialogs have `display: none` (UA) and don't get snapshotted, so
 * sharing the name across all `.lightbox` dialogs at rest is harmless —
 * only the open one participates in any given transition. */
dialog.lightbox {
  view-transition-name: lightbox-dialog;
}

::view-transition-group(lightbox-dialog) {
  z-index: 20;
}

/* The image wrapper (and the thumb during the OLD snapshot of an open
 * transition) shares this static name — imperatively assigned only during
 * the morph, so there's never more than one element holding it at a time.
 * z=30 keeps it above the dialog (z=20) and the footer (z=10) during VT. */
::view-transition-group(lightbox-frame) {
  z-index: 30;
}

/* Lightbox image sizing — leaves vertical headroom for the fixed close button
 * (sits at top-3, ~2.5rem tall). 8rem total = ~4rem top/bottom after centering,
 * so the button never overlaps the image.
 * box-sizing: content-box so max-w/max-h apply to the image pixels and the
 * 3px brutal-border sits outside them — avoids subpixel clipping of the
 * border by the dialog's overflow:hidden when both have border-box. */
@utility lightbox-image {
  box-sizing: content-box;
  max-width: calc(100vw - 2rem);
  max-height: calc(100vh - 10rem);
}

/* Disable transition animation for Firefox
 * since it isn't supported yet */
@supports (-moz-appearance: none) {
  ::view-transition-group(lightbox-frame),
  ::view-transition-old(lightbox-frame),
  ::view-transition-new(lightbox-frame) {
    animation-duration: 0s !important;
    animation-delay: 0s !important;
  }
}