/**
 * global.css
 * ---------------------------------------------------------------------------
 * Tailwind v4 entry + global base layer for Greg Kilmer's profile site.
 *
 * Tailwind v4 uses a CSS-first config. The `@import "tailwindcss"` pulls in the
 * engine and the `@theme` block below exposes the project palette as utility
 * classes (e.g. `bg-surface`, `text-accent`). Section/light-dark tokens live in
 * themes.css and are referenced here via CSS variables.
 *
 * Import order matters: theme tokens first (so @theme can reference them), then
 * Tailwind, then animations, then base.
 */

/* Palette + light/dark + section surface tokens (CSS variables). */
@import "./themes.css";
/* Keyframes (gradient shift, fade-up, blur, float). */
@import "./animations.css";

/* Tailwind engine. In v4 this is a single import. */
@import "tailwindcss";

/* ---------------------------------------------------------------------------
 * Theme bridge: expose CSS variables from themes.css to Tailwind utilities.
 * Each entry below generates a utility family, e.g. `--color-surface` -> the
 * `bg-surface` / `text-surface` / `border-surface` classes.
 * The values point at the CSS variables so that changing `data-theme` or the
 * section wrapper (`data-surface`) instantly restyles every component.
 * ------------------------------------------------------------------------- */
@theme {
  /* Brand colors (fixed, do not change with theme). Night-sky mystical set:
   * star gold, mystic violet, nebula teal, midnight indigo, star-white. */
  --color-amber: #e8b54a; /* star gold */
  --color-amber-soft: #f4cd72; /* brighter gold for hovers */
  --color-violet: #8b7bd8; /* mystic violet */
  --color-violet-deep: #6f5fb6;
  --color-teal: #6fb6ad; /* nebula teal */
  --color-teal-deep: #4f8c84;
  --color-slate: #161b3a; /* deep indigo-slate */
  --color-ink: #0b1026; /* midnight indigo */
  --color-cream: #f4f1e8; /* star-white */

  /* Semantic tokens (resolve per theme/section via variables). */
  --color-surface: var(--surface);
  --color-surface-raised: var(--surface-raised);
  --color-surface-sunken: var(--surface-sunken);
  --color-text: var(--text);
  --color-text-muted: var(--text-muted);
  --color-text-subtle: var(--text-subtle);
  --color-border: var(--border);
  --color-accent: var(--accent);
  --color-accent-contrast: var(--accent-contrast);
  --color-secondary: var(--secondary);

  /* Typography. */
  --font-sans: "Plus Jakarta Sans Variable", "Inter Variable", ui-sans-serif,
    system-ui, sans-serif;
  --font-body: "Inter Variable", ui-sans-serif, system-ui, sans-serif;
  --font-mono: "JetBrains Mono Variable", ui-monospace, "SFMono-Regular", monospace;

  /* Motion tokens (used across reveal + transition classes). */
  --ease-out-soft: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in-out-soft: cubic-bezier(0.65, 0, 0.35, 1);
}

/* ---------------------------------------------------------------------------
 * Base layer: resets, defaults, focus styles.
 * ------------------------------------------------------------------------- */
@layer base {
  :root {
    color-scheme: light dark;
  }

  html {
    scroll-behavior: smooth;
    /* Offset so anchor jumps clear the fixed nav. */
    scroll-padding-top: 6rem;
    -webkit-text-size-adjust: 100%;
  }

  /* Honor reduced motion globally. */
  @media (prefers-reduced-motion: reduce) {
    html {
      scroll-behavior: auto;
    }
    *,
    *::before,
    *::after {
      animation-duration: 0.001ms !important;
      animation-iteration-count: 1 !important;
      transition-duration: 0.001ms !important;
      scroll-behavior: auto !important;
    }
  }

  body {
    background-color: var(--color-surface);
    color: var(--color-text);
    font-family: var(--font-body);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    min-height: 100dvh;
  }

  h1,
  h2,
  h3,
  h4 {
    font-family: var(--font-sans);
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.02em;
    color: var(--color-text);
  }

  /* Strong typographic rhythm for headings. */
  h1 {
    font-size: clamp(2.25rem, 5vw + 1rem, 4rem);
  }
  h2 {
    font-size: clamp(1.75rem, 2.5vw + 1rem, 2.5rem);
  }
  h3 {
    font-size: clamp(1.25rem, 1vw + 1rem, 1.5rem);
  }

  a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color 0.2s var(--ease-out-soft);
  }
  a:hover {
    color: var(--color-amber-soft);
  }

  /* Visible, on-brand focus ring for keyboard users. */
  :focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
    border-radius: 4px;
  }

  ::selection {
    background: var(--color-amber);
    color: var(--color-ink);
  }

  /* Better default for images: never overflow, lazy by default in components. */
  img {
    max-width: 100%;
    height: auto;
  }
}

/* ---------------------------------------------------------------------------
 * Component-ish utilities used across the site. Keeping them here (rather than
 * as repeated Tailwind class strings) makes tone adjustments easy.
 * ------------------------------------------------------------------------- */
@layer components {
  /* Content width container. */
  .container-prose {
    width: 100%;
    max-width: 72rem;
    margin-inline: auto;
    padding-inline: 1.25rem;
  }
  @media (min-width: 768px) {
    .container-prose {
      padding-inline: 2rem;
    }
  }

  /* The recurring "card" surface. */
  .card {
    background-color: var(--color-surface-raised);
    border: 1px solid var(--color-border);
    border-radius: 1rem;
    padding: 1.5rem;
    transition:
      transform 0.3s var(--ease-out-soft),
      box-shadow 0.3s var(--ease-out-soft),
      border-color 0.3s var(--ease-out-soft);
  }
  .card-interactive:hover {
    transform: translateY(-4px);
    box-shadow: 0 18px 40px -24px rgba(11, 16, 38, 0.55);
    border-color: var(--color-accent);
  }

  /* Pill / tag. */
  .pill {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.25rem 0.7rem;
    border-radius: 999px;
    font-size: 0.8rem;
    font-weight: 500;
    background: color-mix(in srgb, var(--color-accent) 15%, transparent);
    color: var(--color-text);
    border: 1px solid color-mix(in srgb, var(--color-accent) 35%, transparent);
  }

  /* Primary (amber) and secondary (outlined) CTA buttons. */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 0.6rem;
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 1rem;
    line-height: 1;
    cursor: pointer;
    transition:
      transform 0.2s var(--ease-out-soft),
      box-shadow 0.2s var(--ease-out-soft),
      background-color 0.2s var(--ease-out-soft),
      border-color 0.2s var(--ease-out-soft);
  }
  .btn:active {
    transform: translateY(1px);
  }
  .btn-primary {
    background: var(--color-amber);
    color: var(--color-ink);
    box-shadow: 0 10px 30px -12px rgba(245, 158, 11, 0.7);
  }
  .btn-primary:hover {
    background: var(--color-amber-soft);
    color: var(--color-ink);
    transform: translateY(-2px);
  }
  .btn-secondary {
    background: transparent;
    color: var(--text);
    border: 1.5px solid var(--color-border);
  }
  .btn-secondary:hover {
    border-color: var(--color-accent);
    color: var(--color-text);
    transform: translateY(-2px);
  }
}

/* Visually hidden but available to screen readers. */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---------------------------------------------------------------------------
 * Reveal-on-scroll utility. The Reveal.astro component toggles `.is-visible`.
 *
 * The `.no-js` guard below is critical: <html> starts with class="no-js"
 * (set in BaseLayout.astro) and reveal-init.ts removes it once it has wired up
 * the observer. If JS is disabled OR the script fails to load, that class is
 * never removed — so this fallback forces reveals visible rather than leaving
 * the page blank. This is the safety net against the original invisibility bug.
 * ------------------------------------------------------------------------- */
.no-js .reveal {
  opacity: 1 !important;
  transform: none !important;
}
/* Elegant entrance: a slow rise + soft focus-clear, with a gentle scale settle.
 * Slower and smoother than a plain fade-up so text "settles" into place rather
 * than popping. The slight blur-to-sharp adds a dreamy, mystical quality. */
.reveal {
  opacity: 0;
  transform: translateY(18px) scale(0.985);
  filter: blur(6px);
  transition:
    opacity 0.9s var(--ease-out-soft),
    transform 1s var(--ease-out-soft),
    filter 0.9s var(--ease-out-soft);
  will-change: opacity, transform, filter;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0) scale(1);
  filter: blur(0px);
}
@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    filter: none;
    transition: none;
  }
}

/* ---------------------------------------------------------------------------
 * View Transition name utility. Assigns `view-transition-name: sky` to a single
 * hero/section field per page so the browser morphs the star/circuit field as
 * one element across navigations (constellations <-> circuitry).
 *
 * IMPORTANT: the View Transitions API requires this name to be UNIQUE within a
 * page snapshot. Assigning it to more than one element per page throws
 * "Unexpected duplicate view-transition-name: sky" and aborts the transition.
 * Only ONE field per page should ever carry `.vt-sky`.
 *
 * Implemented as a CSS class (not React inline style) so SSR + hydration
 * attributes match exactly and React never rewrites the property.
 * ------------------------------------------------------------------------- */
.vt-sky {
  view-transition-name: sky;
}

/* Hero expand/collapse morph. The Home hero section carries this name on Home;
 * the NavBar carries it on every OTHER page. So leaving Home morphs the tall
 * hero down into the nav bar (collapse), and arriving Home expands it back up
 * from the nav bar. The custom animation below makes the morph a smooth
 * vertical scale + position interpolation rather than the default cross-fade,
 * so the starry field reads as growing/shrinking rather than fading. */
.vt-hero-sky {
  view-transition-name: hero-sky;
}

::view-transition-group(hero-sky) {
  animation-duration: 0.26s;
  animation-timing-function: cubic-bezier(0.22, 1, 0.36, 1);
}
::view-transition-old(hero-sky),
::view-transition-new(hero-sky) {
  /* A gentle height/scale blend reads as expand/collapse rather than a swap. */
  animation-duration: 0.26s;
  animation-timing-function: cubic-bezier(0.22, 1, 0.36, 1);
  overflow: clip;
}

/* ---------------------------------------------------------------------------
 * View Transitions — smooth cross-page navigation.
 *
 * Astro's <ClientRouter /> uses the native View Transitions API. Without the
 * rules below the browser falls back to a blunt default cross-fade that feels
 * harsh, and worse: the NEW page is snapshotted while its `.reveal` elements
 * are still at opacity:0 (the scroll-reveal observer hasn't fired yet), so all
 * content flashes out during the morph and re-appears after the swap. The two
 * fixes here:
 *
 *   1. `::view-transition-group(root)` gets a short, soft duration + ease so
 *      the swap is quick and gentle instead of slow and jarring.
 *   2. `html:has(...)::view-transition-*` + an `astro:before-swap` class forces
 *      every `.reveal` to `is-visible` DURING the transition — so the snapshot
 *      of the incoming page shows its content, eliminating the flash. (The
 *      reveal-init.ts observer still handles the normal scroll case.)
 *
 * Reduced-motion users get an instant swap (no animation).
 * ------------------------------------------------------------------------- */
@view-transition {
  navigation: auto;
}

::view-transition-old(root),
::view-transition-new(root) {
  animation-duration: 0.18s;
  animation-timing-function: cubic-bezier(0.22, 1, 0.36, 1);
}

/* During a transition, force all reveal content visible so the incoming page's
 * snapshot isn't blank. `.vt-transitioning` is toggled by the script below on
 * astro:before-swap and removed on astro:after-swap. */
html.vt-transitioning .reveal {
  opacity: 1 !important;
  transform: none !important;
  filter: none !important;
}

@media (prefers-reduced-motion: reduce) {
  ::view-transition-old(root),
  ::view-transition-new(root),
  ::view-transition-group(*) {
    animation: none !important;
  }
}