/* ============================================================
   Layers declaration — order determines cascade priority
   ============================================================ */
@layer reset, base, theme, layout, components;

/* ============================================================
   Reset
   ============================================================ */
@layer reset {
  *, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }

  img, svg {
    display: block;
    max-inline-size: 100%;
  }

  button {
    cursor: pointer;
    background: none;
    border: none;
    font: inherit;
    color: inherit;
  }

  a {
    color: inherit;
    text-decoration: none;
  }
}

/* ============================================================
   Theme — CSS custom properties
   ============================================================ */
@layer theme {
  :root {
    color-scheme: light dark;

    /* ── Palette — amber bg / red accent / dark-gray + white text ─────────── */
    /* Light: amber dominates; red as accent, white lines on canvas            */
    --color-bg:           #ffbb00;   /* amber/yellow                           */
    --color-surface:      #e6a800;   /* deeper amber — hover pills             */
    --color-surface-2:    #cc9500;
    --color-text:         #3d3d3d;   /* dark gray — 6.51:1 on amber ✓          */
    --color-text-muted:   #3d2000;   /* dark amber — 9.19:1 on amber ✓         */
    --color-accent:       #F71342;   /* red — canvas dots, portrait ring       */
    --color-accent-hover: #c8002e;
    --color-accent-2:     #ffffff;   /* white — canvas lines                   */
    --color-border:       #cc9500;   /* deep amber border                      */

    /* Spacing tokens */
    --space-xs:  clamp(0.25rem, 1vw, 0.5rem);
    --space-sm:  clamp(0.5rem,  2vw, 0.75rem);
    --space-md:  clamp(0.75rem, 3vw, 1.25rem);
    --space-lg:  clamp(1.25rem, 4vw, 2rem);
    --space-xl:  clamp(2rem,    6vw, 4rem);
    --space-2xl: clamp(3rem,    8vw, 6rem);

    /* Type scale */
    --text-sm:   clamp(0.8rem,  1.5vw, 0.9rem);
    --text-base: clamp(1rem,    2vw,   1.0625rem);
    --text-lg:   clamp(1.125rem, 2.5vw, 1.25rem);
    --text-xl:   clamp(1.5rem,  4vw,   2.25rem);
    --text-2xl:  clamp(2rem,    6vw,   3.5rem);

    /* Radii */
    --radius-sm:   0.25rem;
    --radius-md:   0.5rem;
    --radius-full: 9999px;

    /* WCO title bar — defaults to 0 outside installed PWA */
    --titlebar-height: env(titlebar-area-height, 0px);
    --titlebar-x:      env(titlebar-area-x, 0px);
    --titlebar-y:      env(titlebar-area-y, 0px);
    --titlebar-width:  env(titlebar-area-width, 100%);
  }

  /* Dark: charcoal bg; red accent, orange canvas lines                       */
  @media (prefers-color-scheme: dark) {
    :root {
      --color-bg:           #3d3d3d;   /* dark gray (same value as light text) */
      --color-surface:      #4a4a4a;
      --color-surface-2:    #575757;
      --color-text:         #ffffff;   /* white — 10.9:1 on charcoal ✓         */
      --color-text-muted:   #c8c8c8;   /* light gray — 6.65:1 on charcoal ✓   */
      --color-accent:       #F71342;   /* red — decorative on dark             */
      --color-accent-hover: #ff4060;
      --color-accent-2:     #ffbb00;   /* amber — canvas lines, warm callback  */
      --color-border:       #555555;
    }
  }

  /* Manual overrides — beat the media query via [data-theme] specificity */
  [data-theme="light"] {
    --color-bg:           #ffbb00;
    --color-surface:      #e6a800;
    --color-surface-2:    #cc9500;
    --color-text:         #3d3d3d;
    --color-text-muted:   #3d2000;
    --color-accent:       #F71342;
    --color-accent-hover: #c8002e;
    --color-accent-2:     #ffffff;
    --color-border:       #cc9500;
  }

  [data-theme="dark"] {
    --color-bg:           #3d3d3d;
    --color-surface:      #4a4a4a;
    --color-surface-2:    #575757;
    --color-text:         #ffffff;
    --color-text-muted:   #c8c8c8;
    --color-accent:       #F71342;
    --color-accent-hover: #ff4060;
    --color-accent-2:     #F79813;
    --color-border:       #555555;
  }

  /* Theme toggle icon visibility — CSS-only, no JS needed for first paint */
  #icon-sun  { display: none; }
  #icon-moon { display: block; }

  @media (prefers-color-scheme: dark) {
    #icon-sun  { display: block; }
    #icon-moon { display: none; }
  }

  [data-theme="light"] #icon-sun  { display: none; }
  [data-theme="light"] #icon-moon { display: block; }
  [data-theme="dark"]  #icon-sun  { display: block; }
  [data-theme="dark"]  #icon-moon { display: none; }
}

/* ============================================================
   Base
   ============================================================ */
@layer base {
  html {
    font-size: 100%;
    scroll-behavior: smooth;
  }

  body {
    font-family: system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
    font-size: var(--text-base);
    line-height: 1.6;
    background-color: var(--color-bg);
    color: var(--color-text);
    /* Shift body down when WCO title bar is present */
    padding-block-start: var(--titlebar-height);
    transition:
      background-color 0.25s ease,
      color 0.25s ease;
  }

  :focus-visible {
    /* --color-text always passes 4.5:1 on both bg colours */
    outline: 2px solid var(--color-text);
    outline-offset: 3px;
    border-radius: var(--radius-sm);
  }
}

/* ============================================================
   Layout
   ============================================================ */
@layer layout {
  /* Particle canvas — fixed, behind everything */
  #bg-canvas {
    position: fixed;
    inset: 0;
    inline-size: 100%;
    block-size: 100%;
    z-index: 0;
    pointer-events: none; /* allow clicks to pass through to page */
  }

  /* WCO title bar area */
  .title-bar-area {
    position: fixed;
    inset-block-start: var(--titlebar-y);
    inset-inline-start: var(--titlebar-x);
    inline-size: var(--titlebar-width);
    block-size: var(--titlebar-height);
    z-index: 1000;
    /* Allow dragging the title bar to move the app window */
    -webkit-app-region: drag;
    app-region: drag;
    display: flex;
    align-items: center;
    padding-inline: var(--space-md);
    overflow: hidden;
  }

  .title-bar-name {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-text);
    opacity: 0.7;
    /* Prevent the text from being accidentally dragged */
    -webkit-app-region: no-drag;
    app-region: no-drag;
    pointer-events: none;
    user-select: none;
  }

  .site-header {
    position: relative;
    z-index: 10;
    background-color: color-mix(in srgb, var(--color-bg) 30%, transparent);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-block-end: 1px solid var(--color-border);
  }

  .header-inner {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    max-inline-size: 72rem;
    margin-inline: auto;
    padding-inline: var(--space-lg);
    padding-block: var(--space-md);
  }

  main {
    position: relative;
    z-index: 1;
  }

  .site-footer {
    position: relative;
    z-index: 1;
    text-align: center;
    padding-block: var(--space-xl);
    padding-inline: var(--space-lg);
    color: var(--color-text-muted);
    font-size: var(--text-sm);
    border-block-start: 1px solid var(--color-border);
  }
}

/* ============================================================
   Components
   ============================================================ */
@layer components {
  /* ── Site name ─────────────────────────────────────── */
  .site-name {
    font-weight: 700;
    font-size: var(--text-lg);
    letter-spacing: -0.02em;
    /* --color-text: 6.51:1 on amber (light) and 10.9:1 on charcoal (dark) ✓ */
    color: var(--color-text);
    margin-inline-end: auto;
    transition: color 0.2s ease;
  }

  .site-name:hover {
    color: var(--color-text-muted);
  }

  /* ── Social nav ────────────────────────────────────── */
  .social-nav {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    list-style: none;
  }

  .social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    inline-size: 2rem;
    block-size: 2rem;
    border-radius: var(--radius-full);
    color: var(--color-text-muted);
    transition:
      color 0.2s ease,
      background-color 0.2s ease;
  }

  .social-link:hover {
    color: var(--color-accent);
    background-color: var(--color-surface);
  }

  /* ── Theme toggle ──────────────────────────────────── */
  .theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    inline-size: 2rem;
    block-size: 2rem;
    border-radius: var(--radius-full);
    color: var(--color-text-muted);
    transition:
      color 0.2s ease,
      background-color 0.2s ease;
  }

  .theme-toggle:hover {
    color: var(--color-accent);
    background-color: var(--color-surface);
  }

  /* ── Hero ──────────────────────────────────────────── */
  .hero {
    container-type: inline-size;
    position: relative;
    min-block-size: 100svh;
    display: flex;
    align-items: center;
    overflow: hidden;
  }

  @media (min-width: 55rem) {
    .hero {
      min-block-size: 40svh;
    }
  }

  .hero-backdrop {
    position: absolute;
    inset: 0;
    z-index: 0;
  }

  .hero-bg-img {
    inline-size: 100%;
    block-size: 100%;
    object-fit: cover;
    object-position: center;
    opacity: 0.3;
  }

  /* Warm gradient overlay so text stays readable over any photo */
  .hero-overlay {
    position: absolute;
    inset: 0;
    z-index: 1;
    background: linear-gradient(
      to bottom,
      color-mix(in srgb, var(--color-bg) 20%, transparent) 0%,
      color-mix(in srgb, var(--color-bg) 60%, transparent) 50%,
      color-mix(in srgb, var(--color-bg) 90%, transparent) 100%
    );
  }

  .hero-content {
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-lg);
    max-inline-size: 72rem;
    margin-inline: auto;
    padding-inline: var(--space-lg);
    padding-block: var(--space-2xl);
    text-align: center;
  }

  /* Side-by-side layout at wider viewports */
  @container (min-width: 42rem) {
    .hero-content {
      flex-direction: row;
      text-align: start;
      align-items: flex-start;
    }
  }

  /* ── Portrait ──────────────────────────────────────── */
  .hero-portrait-wrap {
    flex-shrink: 0;
  }

  .portrait {
    inline-size: clamp(7rem, 20vw, 10rem);
    aspect-ratio: 1;
    border-radius: var(--radius-full);
    object-fit: cover;
    border: 3px solid var(--color-accent);
    box-shadow: 0 0 0 5px color-mix(in srgb, var(--color-accent) 20%, transparent);
  }

  /* ── Hero text ─────────────────────────────────────── */
  .hero-text {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
  }

  .hero-name {
    font-size: var(--text-2xl);
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.1;
    color: var(--color-text);
  }

  .hero-tagline {
    font-size: var(--text-lg);
    /* --color-text-muted: 9.19:1 on amber (light) / 6.65:1 on charcoal (dark) ✓ */
    color: var(--color-text-muted);
    font-weight: 600;
    letter-spacing: 0.01em;
  }

  .hero-bio {
    font-size: var(--text-base);
    color: var(--color-text-muted);
    max-inline-size: 52ch;
    line-height: 1.75;
  }

  /* Hero decorative layers must not capture pointer events */
  .hero-backdrop,
  .hero-overlay {
    pointer-events: none;
  }

  /* ── Page nav (header section links) ─────────── */
  .page-nav {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
  }

  /* Hide on very narrow viewports to avoid header overflow */
  @media (max-width: 28rem) {
    .page-nav { display: none; }
  }

  .nav-link {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-text-muted);
    padding-block: 0.25em;
    padding-inline: 0.6em;
    border-radius: var(--radius-sm);
    transition: color 0.2s ease, background-color 0.2s ease;
  }

  .nav-link:hover,
  .nav-link[aria-current="page"] {
    color: var(--color-text);
    background-color: var(--color-surface);
  }

  /* ── Section layout ───────────────────────────── */
  .projects-section {
    container-type: inline-size;
    position: relative;
    z-index: 1;
    padding-block: var(--space-2xl);
    padding-inline: var(--space-lg);
  }

  .section-inner {
    max-inline-size: 72rem;
    margin-inline: auto;
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
  }

  .section-title {
    font-size: var(--text-xl);
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--color-text);
  }

  /* ── Projects grid ─────────────────────────────── */
  .projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(min(100%, 18rem), 1fr));
    gap: var(--space-md);
  }

  /* ── Project card ──────────────────────────────── */
  .project-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
  }

  .project-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px color-mix(in srgb, var(--color-text) 10%, transparent);
  }

  @media (prefers-reduced-motion: reduce) {
    .project-card { transition: none; }
    .project-card:hover { transform: none; }
  }

  .project-card-thumb {
    inline-size: 100%;
    aspect-ratio: 16 / 9;
    object-fit: cover;
  }

  .project-card-body {
    padding: var(--space-md);
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
    flex: 1;
  }

  .project-card-title {
    font-size: var(--text-lg);
    font-weight: 700;
  }

  .project-card-title a {
    color: var(--color-text);
    transition: color 0.2s ease;
  }

  .project-card-title a:hover {
    color: var(--color-accent);
  }

  .project-card-desc {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    line-height: 1.5;
    flex: 1;
  }

  .project-card-tags {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
    margin-block-start: var(--space-xs);
  }

  .tag {
    display: inline-block;
    padding-block: 0.15em;
    padding-inline: 0.6em;
    font-size: var(--text-sm);
    font-weight: 600;
    background-color: var(--color-surface-2);
    border-radius: var(--radius-full);
    color: var(--color-text-muted);
  }

  .card--hidden {
    display: none;
  }

  /* ── Tag filters ───────────────────────────────── */
  .tag-filters {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
  }

  .tag-filter {
    padding-block: 0.3em;
    padding-inline: 0.9em;
    font-size: var(--text-sm);
    font-weight: 600;
    border-radius: var(--radius-full);
    background-color: var(--color-surface);
    color: var(--color-text-muted);
    border: 1px solid var(--color-border);
    transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
  }

  .tag-filter:hover {
    background-color: var(--color-surface-2);
    color: var(--color-text);
  }

  .tag-filter--active {
    background-color: var(--color-accent);
    color: #ffffff;
    border-color: var(--color-accent);
  }

  .tag-filter--active:hover {
    background-color: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
  }

  /* ── Hero gallery link ─────────────────────────── */
  .hero-gallery-link {
    display: inline-flex;
    align-items: center;
    gap: 0.25em;
    font-size: var(--text-sm);
    font-weight: 700;
    color: var(--color-text);
    border-block-end: 2px solid var(--color-accent);
    padding-block-end: 0.1em;
    align-self: flex-start;
    transition: color 0.2s ease;
  }

  .hero-gallery-link:hover {
    color: var(--color-accent);
  }

  /* ── Gallery teaser section ────────────────────── */
  .gallery-teaser-section {
    container-type: inline-size;
    position: relative;
    z-index: 1;
    padding-block: var(--space-2xl);
    padding-inline: var(--space-lg);
    border-block-start: 1px solid var(--color-border);
  }

  .gallery-teaser-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(min(100%, 9rem), 1fr));
    gap: var(--space-sm);
  }

  .gallery-teaser-thumb {
    display: block;
    aspect-ratio: 1;
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
  }

  .gallery-teaser-thumb:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px color-mix(in srgb, var(--color-text) 12%, transparent);
  }

  .gallery-teaser-thumb img {
    inline-size: 100%;
    block-size: 100%;
    object-fit: cover;
  }

  @media (prefers-reduced-motion: reduce) {
    .gallery-teaser-thumb { transition: none; }
    .gallery-teaser-thumb:hover { transform: none; box-shadow: none; }
  }

  /* ── See-all link ──────────────────────────────── */
  .see-all-link {
    align-self: flex-start;
    font-size: var(--text-sm);
    font-weight: 700;
    color: var(--color-text);
    border-block-end: 2px solid var(--color-accent);
    padding-block-end: 0.1em;
    transition: color 0.2s ease;
  }

  .see-all-link:hover {
    color: var(--color-accent);
  }
}