/* ===== CSS Layers for cascade control ===== */
@layer reset, theme, base, components, utilities;

/* ===== Theme Layer ===== */
@layer theme {
  @import url('https://fonts.googleapis.com/css2?family=Oswald:wght@400;700&display=swap');

  :root {
    /* Modern color space - easier to manipulate */
    --accent: oklch(50% 0.2 15); /* cardinal red */
    --bg-dark: oklch(10% 0 0);
    --bg-card: oklch(15% 0 0);
    --text-primary: oklch(90% 0 0);
    --text-muted: oklch(60% 0 0);
    --border: oklch(25% 0 0);

    /* Spacing scale */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 2rem;
    --space-xl: 3rem;

    /* Typography */
    --font-body: system-ui, sans-serif;
    --font-heading: 'Oswald', sans-serif;
    --font-mono: ui-monospace, 'Cascadia Code', 'Source Code Pro', Menlo, Consolas, monospace;
    --line-height: 1.6;

    /* Layout */
    --content-width: 65ch;
    --border-width: 2px;
  }
}

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

  * {
    margin: 0;
  }

  html {
    interpolate-size: allow-keywords;
    hanging-punctuation: first last;
  }

  body {
    line-height: var(--line-height);
    -webkit-font-smoothing: antialiased;
  }

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

  input, button, textarea, select {
    font: inherit;
  }

  p, h1, h2, h3, h4, h5, h6 {
    overflow-wrap: break-word;
  }

  p {
    text-wrap: pretty;
  }

  h1, h2, h3, h4, h5, h6 {
    text-wrap: balance;
  }

  #root, #__next {
    isolation: isolate;
  }
}

/* ===== Base Layer ===== */
@layer base {
  body {
    min-block-size: 100dvh;
    display: flex;
    flex-direction: column;
    font-family: var(--font-body);
    background-color: var(--bg-dark);
    color: var(--text-primary);
  }

  h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    line-height: 1.2;
  }

  a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.2s;

    &:hover {
      color: color-mix(in oklch, var(--accent), white 20%);
      text-decoration: underline;
    }

    &:focus-visible {
      outline: 2px solid var(--accent);
      outline-offset: 2px;
    }
  }

  ul, ol {
    padding-inline-start: var(--space-lg);
  }

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

/* ===== Components Layer ===== */
@layer components {
  /* Site Header */
  #header {
    text-align: center;
    padding: var(--space-lg) var(--space-md);
    border-block-end: var(--border-width) solid var(--border);

    & h1 {
      font-size: clamp(1.75rem, 5vw, 2.5rem);

      & a {
        color: var(--text-primary);
        text-decoration: none;

        &:hover {
          color: var(--accent);
        }
      }
    }

    & nav {
      margin-block-start: var(--space-md);

      & ul {
        list-style: none;
        padding: 0;
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: var(--space-sm) var(--space-lg);
      }

      & a {
        font-family: var(--font-heading);
        text-transform: uppercase;
        letter-spacing: 0.1em;
        font-size: 0.9rem;
        color: var(--text-muted);

        &:hover {
          color: var(--accent);
          text-decoration: none;
        }
      }
    }
  }

  /* Main Content */
  #main {
    flex: 1;
    inline-size: min(var(--content-width), 100% - var(--space-lg));
    margin-inline: auto;
    padding-block: var(--space-lg);

    & > section {
      margin-block-end: var(--space-xl);
    }

    & h2 {
      margin-block-end: var(--space-lg);
      font-size: clamp(1.5rem, 4vw, 2rem);
    }

    /* Gallery needs wider layout */
    &:has(.gallery-grid) {
      inline-size: min(1200px, 100% - var(--space-lg));
    }
  }

  /* Article Cards */
  article {
    container-type: inline-size;
    background: var(--bg-card);
    padding: var(--space-lg);
    margin-block-end: var(--space-lg);
    border-inline-start: 3px solid var(--accent);

    & header {
      text-align: start;
      padding: 0;
      border: none;
      margin-block-end: var(--space-md);
    }

    & h3 {
      margin-block-end: var(--space-sm);
      font-size: 1.25rem;

      & a {
        color: var(--text-primary);

        &:hover {
          color: var(--accent);
          text-decoration: none;
        }
      }
    }

    & > p,
    & header p {
      color: var(--text-muted);
      font-size: 0.9rem;
    }

    & footer {
      margin-block-start: var(--space-md);
      padding: 0;
      border: none;
      text-align: start;
    }

    /* Responsive adjustments via container query */
    @container (inline-size < 400px) {
      padding: var(--space-md);
    }
  }

  /* Tag List */
  .tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    list-style: none;
    padding: 0;
    margin-block-start: var(--space-sm);

    & li {
      font-size: 0.8rem;
      padding: var(--space-xs) var(--space-sm);
      background: var(--border);
      color: var(--text-muted);
    }
  }

  /* Site Footer */
  #footer {
    margin-block-start: auto;
    text-align: center;
    padding: var(--space-md);
    border-block-start: var(--border-width) solid var(--border);
    color: var(--text-muted);
  }

  /* ===== Gallery Styles ===== */
  .intro {
    margin-block-end: var(--space-xl);
    padding: var(--space-lg);
    background: var(--bg-card);
    border-inline-start: 3px solid var(--accent);

    & p {
      line-height: var(--line-height);
    }
  }

  .gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(min(100%, 320px), 1fr));
    gap: var(--space-lg);
  }

  .gallery-item {
    container-type: inline-size;
    background: var(--bg-card);
    border-radius: 4px;
    overflow: hidden;
    transition: transform 0.2s ease, box-shadow 0.2s ease;

    &:hover {
      transform: translateY(-4px);
      box-shadow: 0 8px 24px oklch(0% 0 0 / 0.4);
    }

    & > img {
      inline-size: 100%;
      block-size: auto;
      aspect-ratio: 4 / 3;
      object-fit: cover;
      cursor: pointer;
      transition: opacity 0.2s ease;

      &:hover {
        opacity: 0.9;
      }
    }
  }

  .photo-info {
    padding: var(--space-md);

    & > p {
      margin-block-end: var(--space-xs);
      line-height: 1.4;

      &:first-child {
        font-family: var(--font-heading);
        font-size: 1.1rem;
        text-transform: uppercase;
        letter-spacing: 0.03em;
        color: var(--text-primary);
        margin-block-end: var(--space-sm);
      }

      &:nth-child(2) {
        font-size: 0.9rem;
        color: var(--text-muted);
      }

      &:nth-child(3) {
        font-size: 0.8rem;
        color: var(--text-muted);
      }

      &:nth-child(4) {
        font-size: 0.85rem;
        color: var(--text-primary);
        margin-block-start: var(--space-sm);
        margin-block-end: var(--space-md);
        display: -webkit-box;
        -webkit-line-clamp: 3;
        -webkit-box-orient: vertical;
        overflow: hidden;
      }
    }
  }

  .keyword {
    display: inline-block;
    font-size: 0.75rem;
    padding: var(--space-xs) var(--space-sm);
    margin-inline-end: var(--space-xs);
    margin-block-end: var(--space-xs);
    background: var(--border);
    color: var(--text-muted);
    border-radius: 2px;
    transition: background-color 0.2s ease, color 0.2s ease;

    &:hover {
      background: var(--accent);
      color: var(--text-primary);
    }
  }

  /* ===== Prose/Content Styling for Markdown ===== */
  .prose {
    /* Vertical rhythm - space between block elements */
    & > * + * {
      margin-block-start: var(--space-md);
    }

    /* Headings */
    & h1, & h2, & h3, & h4, & h5, & h6 {
      margin-block-start: var(--space-lg);
      margin-block-end: var(--space-sm);
      color: var(--text-primary);
    }

    & h1 { font-size: 2rem; }
    & h2 { font-size: 1.5rem; border-block-end: 1px solid var(--border); padding-block-end: var(--space-sm); }
    & h3 { font-size: 1.25rem; }
    & h4 { font-size: 1.1rem; }

    /* First element shouldn't have top margin */
    & > *:first-child {
      margin-block-start: 0;
    }

    /* Paragraphs */
    & p {
      line-height: var(--line-height);
    }

    /* Links within prose */
    & a {
      text-decoration: underline;
      text-underline-offset: 2px;
    }

    /* Lists */
    & ul, & ol {
      padding-inline-start: var(--space-lg);
      
      & li {
        margin-block: var(--space-xs);
        line-height: var(--line-height);
      }

      & li::marker {
        color: var(--accent);
      }
    }

    /* Nested lists */
    & ul ul, & ol ol, & ul ol, & ol ul {
      margin-block-start: var(--space-xs);
    }

    /* Code - inline */
    & code {
      font-family: var(--font-mono);
      font-size: 0.875em;
      padding: 0.15em 0.4em;
      background: oklch(18% 0 0);
      border: 1px solid var(--border);
      border-radius: 3px;
      color: oklch(75% 0.15 30); /* warm orange for inline code */
    }

    /* Code - blocks */
    & pre {
      background: oklch(12% 0 0);
      border: 1px solid var(--border);
      border-inline-start: 3px solid var(--accent);
      padding: var(--space-md);
      overflow-x: auto;
      font-size: 0.875rem;
      line-height: 1.6;
      border-radius: 0 4px 4px 0;

      & code {
        padding: 0;
        background: none;
        border: none;
        font-size: inherit;
        color: var(--text-primary);
      }
    }

    /* Blockquotes */
    & blockquote {
      border-inline-start: 3px solid var(--accent);
      padding-inline-start: var(--space-md);
      padding-block: var(--space-sm);
      margin-inline: 0;
      background: oklch(12% 0 0);
      color: var(--text-muted);
      font-style: italic;

      & p {
        margin: 0;
      }

      & p + p {
        margin-block-start: var(--space-sm);
      }
    }

    /* Images */
    & img {
      max-inline-size: 100%;
      block-size: auto;
      border-radius: 4px;
      margin-block: var(--space-md);
    }

    /* Figures with captions */
    & figure {
      margin-inline: 0;
      margin-block: var(--space-lg);

      & img {
        margin-block-end: var(--space-sm);
        margin-block-start: 0;
      }

      & figcaption {
        font-size: 0.875rem;
        color: var(--text-muted);
        font-style: italic;
        text-align: center;
        padding-block-start: var(--space-sm);
        border-block-start: 1px solid var(--border);
      }
    }

    /* Tables */
    & table {
      inline-size: 100%;
      border-collapse: collapse;
      font-size: 0.9rem;
      margin-block: var(--space-md);
    }

    & th, & td {
      padding: var(--space-sm) var(--space-md);
      text-align: start;
      border-block-end: 1px solid var(--border);
    }

    & th {
      font-family: var(--font-heading);
      text-transform: uppercase;
      font-size: 0.8rem;
      letter-spacing: 0.05em;
      color: var(--text-muted);
      border-block-end: 2px solid var(--border);
      background: oklch(12% 0 0);
    }

    & tr:hover td {
      background: oklch(13% 0 0);
    }

    /* Horizontal rule */
    & hr {
      border: none;
      border-block-start: 1px solid var(--border);
      margin-block: var(--space-lg);
    }

    /* Task lists (checkboxes from markdown) */
    & input[type="checkbox"] {
      accent-color: var(--accent);
      margin-inline-end: var(--space-sm);
    }

    /* Strikethrough */
    & del {
      color: var(--text-muted);
    }

    /* Strong/Bold - make it pop */
    & strong {
      color: var(--text-primary);
      font-weight: 600;
    }

    /* Emphasis */
    & em {
      font-style: italic;
    }
  }
}

/* ===== Utilities Layer ===== */
@layer utilities {
  .visually-hidden {
    clip: rect(0 0 0 0);
    clip-path: inset(50%);
    block-size: 1px;
    inline-size: 1px;
    overflow: hidden;
    position: absolute;
    white-space: nowrap;
  }
}