novarix.uk/app/globals.css

/* ============================================================================
   Novarix Networks — Global stylesheet
   ============================================================================

   This file controls the visual *theme* of the site (colours, fonts,
   background effects, animations). Most page layout is done with Tailwind
   utility classes directly inside `app/page.tsx` — this file only handles
   things that don't fit neatly into utilities.

   What's in here, top to bottom:
     1. Design tokens         — brand colours, font, shadows (@theme block)
     2. Theme variables       — light + dark mode CSS variables
     3. Base styles           — body font, focus rings, text selection
     4. Site shell + ambient  — background gradient, floating orbs, grid
     5. Brand wordmark swap   — light/dark logo switcher
     6. Intro overlay         — first-visit animated logo
     7. Animations            — keyframes used above
     8. Reduced motion        — respect "prefers-reduced-motion" setting

   To change the brand colour palette, edit the `--color-brand-*` lines in
   the @theme block below. Everything else cascades from those.
   ============================================================================ */

@import "tailwindcss";

/* ---------------------------------------------------------------------------
   1. Design tokens — registered with Tailwind v4 via @theme.
   These become utility classes (e.g. `bg-brand-500`, `text-ink-900`) and
   custom CSS variables you can use anywhere in the stylesheet.
   --------------------------------------------------------------------------- */
@theme {
  --font-sans:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", sans-serif;

  --color-brand-50: oklch(0.97 0.015 240);
  --color-brand-100: oklch(0.93 0.04 240);
  --color-brand-200: oklch(0.86 0.07 240);
  --color-brand-300: oklch(0.78 0.11 240);
  --color-brand-400: oklch(0.7 0.14 240);
  --color-brand-500: oklch(0.62 0.16 240);
  --color-brand-600: oklch(0.54 0.18 245);
  --color-brand-700: oklch(0.46 0.18 250);

  --color-ink-50: oklch(0.985 0.003 250);
  --color-ink-100: oklch(0.96 0.005 250);
  --color-ink-200: oklch(0.92 0.008 250);
  --color-ink-300: oklch(0.84 0.012 250);
  --color-ink-400: oklch(0.65 0.018 250);
  --color-ink-500: oklch(0.5 0.02 250);
  --color-ink-600: oklch(0.38 0.022 250);
  --color-ink-700: oklch(0.28 0.024 250);
  --color-ink-800: oklch(0.2 0.026 250);
  --color-ink-900: oklch(0.13 0.028 255);
  --color-ink-950: oklch(0.08 0.03 260);

  --radius-card: 1.25rem;
  --shadow-card: 0 1px 0 0 oklch(1 0 0 / 0.04) inset, 0 12px 32px -12px oklch(0 0 0 / 0.18);
}

/* ---------------------------------------------------------------------------
   2. Theme variables (light + dark)
   These are the runtime CSS variables read by both this file and
   app/page.tsx (via classes like `bg-[var(--surface)]`). Each variable has
   a light value here and a dark override further down inside the
   `@media (prefers-color-scheme: dark)` block.
   --------------------------------------------------------------------------- */
:root {
  color-scheme: light dark;

  --bg: var(--color-ink-50);
  --surface: oklch(1 0 0 / 0.7);
  --surface-strong: oklch(1 0 0 / 0.92);
  --text: var(--color-ink-900);
  --text-soft: var(--color-ink-500);
  --border: oklch(0.13 0.028 255 / 0.1);
  --border-strong: oklch(0.13 0.028 255 / 0.18);
  --accent: var(--color-brand-500);
  --accent-soft: oklch(0.62 0.16 240 / 0.12);
  --ring: oklch(0.62 0.16 240 / 0.4);
  --grid: oklch(0.5 0.02 250 / 0.08);

  --button-bg: var(--color-ink-900);
  --button-fg: var(--color-ink-50);
  --button-hover: var(--color-ink-800);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: var(--color-ink-950);
    --surface: oklch(0.13 0.028 255 / 0.55);
    --surface-strong: oklch(0.13 0.028 255 / 0.85);
    --text: var(--color-ink-100);
    --text-soft: var(--color-ink-400);
    --border: oklch(1 0 0 / 0.08);
    --border-strong: oklch(1 0 0 / 0.16);
    --accent: var(--color-brand-400);
    --accent-soft: oklch(0.7 0.14 240 / 0.18);
    --ring: oklch(0.7 0.14 240 / 0.5);
    --grid: oklch(0.84 0.012 250 / 0.06);

    --button-bg: var(--color-ink-100);
    --button-fg: var(--color-ink-950);
    --button-hover: var(--color-ink-50);
  }
}

/* ---------------------------------------------------------------------------
   3. Base styles — applied to plain HTML elements before any classes hit.
   --------------------------------------------------------------------------- */
@layer base {
  html {
    scroll-behavior: smooth;
  }

  body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-sans);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    overflow-x: hidden;
  }

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

  :focus-visible {
    outline: 2px solid var(--ring);
    outline-offset: 3px;
    border-radius: 4px;
  }
}

/* ---------------------------------------------------------------------------
   4. Site shell + ambient effects
   The .site-shell class is on the <main> element in page.tsx. The two
   radial gradients here follow the user's mouse via the --mx / --my CSS
   variables that page.tsx writes on every mousemove.
   --------------------------------------------------------------------------- */
.site-shell {
  position: relative;
  isolation: isolate;
  min-height: 100vh;
  background:
    radial-gradient(
      circle at var(--mx, 50%) var(--my, 22%),
      oklch(0.62 0.16 240 / 0.12),
      transparent 20%
    ),
    radial-gradient(
      circle at calc(var(--mx, 50%) * 0.65) calc(var(--my, 22%) * 1.2),
      oklch(0.6 0.14 280 / 0.09),
      transparent 24%
    ),
    var(--bg);
}

.ambient-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--grid) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: linear-gradient(to bottom, oklch(0 0 0 / 0.5), transparent 80%);
}

.ambient-orb {
  position: absolute;
  border-radius: 9999px;
  filter: blur(80px);
  opacity: 0.22;
  animation: drift 18s ease-in-out infinite;
  will-change: transform;
}

.ambient-orb-a {
  width: 32rem;
  height: 32rem;
  top: 4rem;
  right: -10rem;
  background: linear-gradient(
    135deg,
    oklch(0.7 0.14 240 / 0.55),
    oklch(0.6 0.14 200 / 0.1)
  );
}

.ambient-orb-b {
  width: 26rem;
  height: 26rem;
  top: 28rem;
  left: -8rem;
  background: linear-gradient(
    135deg,
    oklch(0.6 0.14 280 / 0.35),
    oklch(0.78 0.11 200 / 0.12)
  );
  animation-duration: 22s;
}

/* ---------------------------------------------------------------------------
   5. Brand wordmark colour-scheme swap
   The header logo has two PNG variants — a colour one for light mode and a
   white one for dark mode. The `brand-light` / `brand-dark` classes (set
   in page.tsx) live on both <Image> tags; only the matching one is shown.
   --------------------------------------------------------------------------- */
.brand-light {
  display: block;
}

.brand-dark {
  display: none;
}

@media (prefers-color-scheme: dark) {
  .brand-light {
    display: none;
  }

  .brand-dark {
    display: block;
  }
}

/* ---------------------------------------------------------------------------
   6. Intro overlay
   The first-visit animated SVG wordmark. The SVG itself runs a 3-second
   stroke-then-fill animation (defined inside
   /public/branding/animated_logo_intro.svg). The overlay fades out at the
   3-second mark so the SVG completes before it disappears. Total intro
   length is matched in page.tsx's setTimeout (3600ms).

   When .intro-running is on the <main> element, the page content
   underneath is hidden so it doesn't flash through during the animation.
   --------------------------------------------------------------------------- */
.intro-overlay {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: grid;
  place-items: center; /* dead-centre the SVG in the viewport */
  animation: intro-fade-out 600ms ease 3s forwards;
}

.intro-backdrop {
  position: absolute;
  inset: 0;
  background: var(--bg);
}

.intro-svg {
  position: relative; /* sits above .intro-backdrop in the stacking order */
  display: block;
  width: min(70vw, 900px);
  max-height: 70vh;
  height: auto;
  object-fit: contain;
}

.intro-running .site-header,
.intro-running main > section,
.intro-running main > footer {
  opacity: 0;
}

@media (max-width: 720px) {
  .intro-svg {
    width: min(86vw, 560px);
  }
}

@media (max-width: 480px) {
  .intro-svg {
    width: 92vw;
  }
}

/* ---------------------------------------------------------------------------
   7. Animations — keyframes used by the orbs and the intro overlay above.
   --------------------------------------------------------------------------- */
@keyframes drift {
  0%,
  100% {
    transform: translate3d(0, 0, 0) scale(1);
  }
  50% {
    transform: translate3d(0, 18px, 0) scale(1.06);
  }
}

@keyframes intro-wordmark {
  0% {
    opacity: 0;
    transform: translateY(110%) scale(0.98);
  }
  100% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes intro-fade-out {
  to {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
  }
}

/* ---------------------------------------------------------------------------
   8. Reduced motion
   Respects the user's OS-level "reduce motion" preference by disabling
   the orb drift, the intro animation, and any transition/animation
   durations across the site.
   --------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .ambient-orb,
  .intro-overlay,
  .intro-wordmark {
    animation: none !important;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0ms !important;
    animation-duration: 0ms !important;
  }
}