@tailwind base;
@tailwind components;
@tailwind utilities;

/* Dark theme (default) - CSS custom properties */
:root {
  --bg: #060b10;
  --bg2: #0c1520;
  --bg2-rgb: 12, 21, 32;
  --surface: #101e2d;
  --surface-rgb: 16, 30, 45;
  --border: #182840;
  --accent: #a855f7;
  --accent-rgb: 168, 85, 247;
  --accent2: #00ff88;
  --accent-glow: rgba(168, 85, 247, 0.12);
  --text: #c4d6e8;
  --text-dim: #7a9bb8;
  --muted: #304860;
  /* Article type colors - dark */
  --type-tech: #a855f7;
  --type-life: #f59e0b;
  --type-quote: #00ff88;
  --type-link: #38bdf8;
  --type-photo: #ec4899;
  /* Article type text colors - dark (all black for WCAG AA) */
  --type-tech-text: #000000;
  --type-life-text: #000000;
  --type-quote-text: #000000;
  --type-link-text: #000000;
  --type-photo-text: #000000;
}

/* Light theme overrides */
html.theme-light {
  --bg: #f0f4f8;
  --bg2: #e2eaf4;
  --bg2-rgb: 226, 234, 244;
  --surface: #d4dff0;
  --surface-rgb: 212, 223, 240;
  --border: #a8bdd8;
  --accent: #7c3aed;
  --accent-rgb: 124, 58, 237;
  --accent2: #008f5a;
  --accent-glow: rgba(124, 58, 237, 0.1);
  --text: #0d1b2a;
  --text-dim: #2e4a6a;
  --muted: #6888a8;
  /* Article type colors - light */
  --type-tech: #7c3aed;
  --type-life: #d97706;
  --type-quote: #008f5a;
  --type-link: #0284c7;
  --type-photo: #be185d;
  /* Article type text colors - light (mixed for WCAG AA) */
  --type-tech-text: #ffffff;
  --type-life-text: #000000;
  --type-quote-text: #000000;
  --type-link-text: #000000;
  --type-photo-text: #ffffff;
}

/* No-JS fallback: prefers-color-scheme light */
@media (prefers-color-scheme: light) {
  html:not(.theme-dark) {
    --bg: #f0f4f8;
    --bg2: #e2eaf4;
    --bg2-rgb: 226, 234, 244;
    --surface: #d4dff0;
    --surface-rgb: 212, 223, 240;
    --border: #a8bdd8;
    --accent: #7c3aed;
    --accent-rgb: 124, 58, 237;
    --accent2: #008f5a;
    --accent-glow: rgba(124, 58, 237, 0.1);
    --text: #0d1b2a;
    --text-dim: #2e4a6a;
    --muted: #6888a8;
    --type-tech: #7c3aed;
    --type-life: #d97706;
    --type-quote: #008f5a;
    --type-link: #0284c7;
    --type-photo: #be185d;
    --type-tech-text: #ffffff;
    --type-life-text: #000000;
    --type-quote-text: #000000;
    --type-link-text: #000000;
    --type-photo-text: #ffffff;
  }
}

/* Theme-aware picture element for default thumbnails */
html.theme-light picture img[src="/images/default_thumbnail_dark.png"] {
  content: url('/images/default_thumbnail_light.png');
}

@layer base {
  html {
    @apply overflow-x-hidden;
  }

  body {
    @apply bg-bg text-text font-body overflow-x-hidden;
  }

  h1,
  h2,
  h3,
  h4,
  h5,
  h6 {
    @apply font-bold;
    font-family: 'Oxanium', monospace;
  }

  h1 {
    @apply text-3xl md:text-4xl;
  }

  h2 {
    @apply text-2xl md:text-3xl;
  }

  h3 {
    @apply text-xl md:text-2xl;
  }

  .heading-prefix {
    font-family: 'JetBrains Mono', monospace;
    font-weight: 400;
    font-size: 0.8em;
    color: var(--accent);
    opacity: 0.7;
    margin-right: 0.35em;
    user-select: none;
  }

  a {
    @apply text-accent hover:opacity-80 transition-opacity;
  }

  code {
    @apply font-mono bg-surface border border-border px-1.5 py-0.5 rounded text-accent2;
  }

  pre {
    background-color: rgba(var(--surface-rgb), 0.8);
    @apply p-4 rounded border border-border overflow-x-auto;
  }

  pre code {
    @apply bg-transparent border-0 p-0 text-text;
  }

  *:focus-visible {
    @apply ring-2 ring-accent ring-offset-2;
    ring-offset-color: var(--bg);
  }

  button,
  input,
  textarea,
  select {
    @apply transition-colors duration-200;
  }
}

@layer components {
  .container {
    @apply max-w-4xl mx-auto;
  }

  /* Background utilities */
  .bg-bg {
    background-color: var(--bg);
  }

  .bg-bg2 {
    background-color: var(--bg2);
  }

  .bg-surface {
    background-color: var(--surface);
  }

  /* Border utilities */
  .border-border {
    border-color: var(--border);
  }

  /* Text color utilities */
  .text-accent {
    color: var(--accent);
  }

  .text-accent2 {
    color: var(--accent2);
  }

  .text-text {
    color: var(--text);
  }

  .text-text-dim {
    color: var(--text-dim);
  }

  /* Additional semantic utilities */
  .text-muted {
    color: var(--muted);
  }

  .bg-muted {
    background-color: var(--muted);
  }

  /* Glow effect utility */
  .glow-accent {
    box-shadow: 0 0 20px var(--accent-glow);
  }

  /* Frosted glass bar (header/footer) */
  .frosted-bar {
    background-color: rgba(var(--bg2-rgb), 0.75);
    backdrop-filter: blur(10px);
    box-shadow: 0 0 20px var(--accent-glow);
    /* border applied via utility classes in templates */
  }

  /* Border utilities for frosted-bar component */
  .frosted-bar.border-b,
  .frosted-bar.border-t {
    border-color: var(--border);
  }

  /* Button component styles */
  .btn {
    @apply inline-flex items-center justify-center px-4 py-2 rounded font-bold transition-all duration-200 cursor-pointer;
    background-color: var(--accent);
    color: #ffffff;
    border: none;
    outline: none;
  }

  .btn:hover:not(:disabled) {
    opacity: 0.85;
    transform: translateY(-1px);
  }

  .btn:focus-visible {
    @apply ring-2 ring-offset-2;
    ring-color: var(--accent);
    ring-offset-color: var(--bg);
  }

  .btn:active:not(:disabled) {
    transform: translateY(0);
    opacity: 0.75;
  }

  .btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
  }

  /* Button variants */
  .btn-primary {
    background-color: var(--accent);
    color: #ffffff;
  }

  .btn-primary:hover:not(:disabled) {
    background-color: var(--accent);
  }

  .btn-secondary {
    background-color: var(--accent2);
    color: var(--bg);
    font-weight: 600;
  }

  .btn-secondary:hover:not(:disabled) {
    background-color: var(--accent2);
  }

  .btn-outline {
    background-color: transparent;
    color: var(--accent);
    border: 2px solid var(--accent);
  }

  .btn-outline:hover:not(:disabled) {
    background-color: var(--accent);
    color: #ffffff;
  }

  /* Button sizes */
  .btn-sm {
    @apply px-3 py-1 text-sm;
  }

  .btn-lg {
    @apply px-6 py-3 text-lg;
  }

  /* Icon button (for icons without text) */
  .btn-icon {
    @apply rounded-full inline-flex items-center justify-center;
    width: auto;
    height: auto;
    padding: 0.5rem;
  }

  .btn-icon svg,
  .btn-icon i {
    width: auto !important;
    height: auto !important;
  }

  /* Force Feather icons to match size */
  .btn-icon [data-feather] {
    width: 50px !important;
    height: 50px !important;
  }

  .btn-icon [data-feather] svg {
    width: 50px !important;
    height: 50px !important;
  }

  /* Sidebar widget — no box, no border */
  .sidebar-widget {
    margin-bottom: 1.5rem;
  }

  /* Sidebar widget title — bash comment style */
  .sidebar-widget-label {
    font-family: var(--font-mono, monospace);
    font-size: 1rem;
    font-weight: bold;
    color: var(--accent);
    letter-spacing: 0.08em;
    margin-bottom: 0.5rem;
  }

  /* Sidebar separator */
  .sidebar-hr {
    border: none;
    border-top: 1px solid var(--border);
    margin-bottom: 1.5rem;
  }

  /* =====================
     Tag Cloud Component
     ===================== */

  .tag-cloud {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.75rem;
    align-items: baseline;
    overflow: visible;
  }

  .tag-cloud-link {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.25rem 0.625rem;
    border: 1px solid var(--border);
    border-radius: 0.25rem;
    font-family: var(--font-mono, 'JetBrains Mono', monospace);
    color: var(--text-dim);
    text-decoration: none;
    background-color: var(--bg2);
    transition: border-color 150ms ease-out, color 150ms ease-out, background-color 150ms ease-out, opacity 150ms ease-out;
    white-space: nowrap;
    line-height: 1.4;
  }

  .tag-cloud-link:hover {
    border-color: rgba(var(--accent-rgb), 0.5);
    color: var(--accent);
    background-color: rgba(var(--accent-rgb), 0.1);
  }

  .tag-cloud-link:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
    border-radius: 0.25rem;
  }

  .tag-cloud-count {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0 0.375rem;
    border-radius: 9999px;
    font-size: 0.65em;
    font-weight: 600;
    background-color: rgba(var(--accent-rgb), 0.12);
    color: var(--accent);
    line-height: 1.6;
    min-width: 1.2em;
  }

  @media (prefers-reduced-motion: reduce) {
    .tag-cloud-link {
      transition: none;
    }
  }

  .share-grid {
    display: grid;
    grid-template-columns: repeat(3, 50px);
    justify-content: space-evenly;
    justify-items: center;
    align-content: space-evenly;
    align-items: center;
  }

  .btn-share {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    border-radius: 4px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text-dim);
    cursor: pointer;
    transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease, box-shadow 0.15s ease;
    text-decoration: none;
  }

  .btn-share svg,
  .btn-share i,
  .btn-share [data-feather] {
    width: 22px !important;
    height: 22px !important;
    flex-shrink: 0;
  }

  .btn-share:hover {
    color: var(--accent);
    border-color: rgba(var(--accent-rgb), 0.5);
    background: rgba(var(--accent-rgb), 0.06);
    box-shadow: 0 0 10px var(--accent-glow);
  }

  .btn-share:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
    color: var(--accent);
    border-color: var(--accent);
  }

  .btn-share--copied {
    color: var(--accent2);
    border-color: var(--accent2);
    background: var(--surface);
  }

  @media (prefers-reduced-motion: reduce) {
    .btn-share {
      transition: none;
    }
  }

  /* Badge base style */
  .badge {
    @apply inline-flex items-center px-2.5 py-1 rounded text-sm font-mono font-semibold whitespace-nowrap transition-all duration-200;
    border: 1px solid;
  }

  /* Article type badge styles */
  .badge-tech {
    color: var(--type-tech);
    background-color: rgba(168, 85, 247, 0.1);
    border-color: rgba(168, 85, 247, 0.3);
  }

  .badge-tech:hover {
    background-color: rgba(168, 85, 247, 0.2);
  }

  .badge-life {
    color: var(--type-life);
    background-color: rgba(245, 158, 11, 0.1);
    border-color: rgba(245, 158, 11, 0.3);
  }

  .badge-life:hover {
    background-color: rgba(245, 158, 11, 0.2);
  }

  .badge-quote {
    color: var(--type-quote);
    background-color: rgba(0, 255, 136, 0.1);
    border-color: rgba(0, 255, 136, 0.3);
  }

  .badge-quote:hover {
    background-color: rgba(0, 255, 136, 0.2);
  }

  .badge-link {
    color: var(--type-link);
    background-color: rgba(56, 189, 248, 0.1);
    border-color: rgba(56, 189, 248, 0.3);
  }

  .badge-link:hover {
    background-color: rgba(56, 189, 248, 0.2);
  }

  .badge-photo {
    color: var(--type-photo);
    background-color: rgba(236, 72, 153, 0.1);
    border-color: rgba(236, 72, 153, 0.3);
  }

  .badge-photo:hover {
    background-color: rgba(236, 72, 153, 0.2);
  }

  /* Legacy type-* classes for compatibility (with badge styling) */
  .type-tech {
    color: var(--type-tech);
    background-color: rgba(168, 85, 247, 0.1);
  }

  .type-life {
    color: var(--type-life);
    background-color: rgba(245, 158, 11, 0.1);
  }

  .type-quote {
    color: var(--type-quote);
    background-color: rgba(0, 255, 136, 0.1);
  }

  .type-link {
    color: var(--type-link);
    background-color: rgba(56, 189, 248, 0.1);
  }

  .type-photo {
    color: var(--type-photo);
    background-color: rgba(236, 72, 153, 0.1);
  }

  /* Card component */
  .card {
    @apply border border-border rounded-lg overflow-hidden transition-all duration-200;
    box-shadow: 0 0 20px var(--accent-glow);
  }

  .card:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px var(--accent-glow);
  }

  .card-image {
    @apply aspect-video object-cover w-full;
  }

  .card-body {
    @apply p-5 md:p-6 space-y-3;
  }

  .card-title {
    @apply text-xl font-semibold;
  }

  .card-excerpt {
    @apply text-text-dim text-sm line-clamp-3;
  }

  .card-footer {
    @apply flex items-center justify-between gap-4;
  }

  /* =====================
     Repository Grid
     ===================== */

  .repo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
  }

  .repo-card:only-child {
    max-width: 50%;
    margin-inline: auto;
  }

  /* =====================
     Timeline Layout
     ===================== */

  .timeline {
    @apply relative mx-auto max-w-5xl px-4 py-12;
  }

  /* Vertical spine */
  .timeline::before {
    content: '';
    @apply absolute top-0 bottom-0;
    /* Mobile: fixed 20px from container left edge */
    left: 20px;
    width: 2px;
    background: linear-gradient(to bottom, var(--accent), var(--accent2, var(--accent)));
    opacity: 0.7;
  }

  @screen md {
    .timeline::before {
      left: 50%;
      transform: translateX(-50%);
    }
  }

  /* Each timeline row — block, full width, positioned context for abs children */
  .timeline-item {
    @apply relative mb-10;
    /*
      Mobile geometry (.timeline has px-4 = 16px padding):
      spine left = 20px from <ol> border → 20-16 = 4px from item's containing block.
      We want card to start ~8px right of spine right edge (22px from <ol> = 6px from block).
      Use margin-left: 30px so card starts at 16+30=46px from <ol>, 24px right of spine right.
      abs children: spine left relative to item = 4 - 30 = -26px.
    */
    margin-left: 30px;
  }

  @screen md {
    .timeline-item {
      margin-left: 0;
    }
  }

  /* ---- Connector line ---- */
  .timeline-connector {
    @apply absolute;
    top: 20px;
    height: 2px;
    /*
      Mobile: .timeline px-4(16px) + item margin-left(30px) = 46px from <ol> border.
      Spine right edge = 22px from <ol> border = 22-46 = -24px from item left.
      Connector: left=-24px, width=24px → touches spine right and card left edge.
    */
    left: -24px;
    width: 24px;
  }

  @screen md {
    /*
      spine center = 50% of item. Spine is 2px: left edge at 50%-1px, right at 50%+1px.
      Cards occupy [0 .. 50%-24px] (left) or [50%+24px .. 100%] (right).
      Left connector: left=50%-24px, width=23px → touches card right edge and spine left.
      Right connector: left=50%+1px, width=23px → touches spine right and card left.
    */
    .timeline-item--left .timeline-connector {
      left: calc(50% - 24px);
      width: 23px;
    }
    .timeline-item--right .timeline-connector {
      left: calc(50% + 1px);
      width: 23px;
    }
  }

  /* ---- Node on spine ---- */
  .timeline-node {
    @apply absolute rounded-full z-10;
    top: 14px;
    /*
      Mobile: spine center = 21px from <ol> border = 21-46 = -25px from item left.
      Node (10px wide): left = -25 - 5 = -30px.
    */
    left: -30px;
    width: 10px;
    height: 10px;
    border: 2px solid var(--bg);
  }

  @screen md {
    .timeline-node {
      width: 12px;
      height: 12px;
      top: 14px;
      /* Desktop: spine center = 50% of item. Node center on spine: left = 50% - 6px */
      left: calc(50% - 6px);
    }
  }

  /* ---- Card wrapper ---- */
  .timeline-card {
    @apply flex border rounded-lg overflow-hidden bg-surface;
    /* Mobile: column (thumb on top) */
    flex-direction: column;
    width: 100%;
    transition: box-shadow 0.2s, transform 0.2s;
  }

  .timeline-card:hover {
    transform: translateY(-2px);
  }

  @screen md {
    /* Desktop: push card into left or right half via item padding */
    .timeline-item--left {
      padding-right: calc(50% + 24px);
    }
    .timeline-item--right {
      padding-left: calc(50% + 24px);
    }
    /* Left card: thumb outer-left, body inner-right */
    .timeline-item--left .timeline-card {
      flex-direction: row;
    }
    /* Right card: body inner-left, thumb outer-right */
    .timeline-item--right .timeline-card {
      flex-direction: row-reverse;
    }
  }

  /* ---- Thumbnail panel ---- */
  .timeline-thumb {
    @apply flex-shrink-0 overflow-hidden;
    /* Mobile: full-width banner */
    width: 100%;
    height: 90px;
  }

  @screen md {
    .timeline-thumb {
      /* 3:2 landscape: wider than tall */
      width: 40%;
      height: auto;
      aspect-ratio: 3 / 2;
    }
  }

  .timeline-thumb img {
    @apply w-full h-full object-cover;
    transition: transform 0.2s;
  }

  .timeline-card:hover .timeline-thumb img {
    transform: scale(1.03);
  }

  /* ---- Text panel ---- */
  .timeline-body {
    @apply flex flex-col gap-2 p-4 flex-1;
  }

  /* ---- Meta row (TYPE · date) ---- */
  .timeline-meta {
    @apply flex items-center gap-2 text-xs font-mono tracking-widest uppercase;
  }

  .timeline-meta-sep {
    @apply text-border;
  }

  .timeline-date {
    @apply text-text-dim normal-case tracking-normal;
  }

  /* ---- Title ---- */
  .timeline-title {
    @apply font-semibold text-base leading-snug;
  }

  .timeline-title a {
    @apply hover:text-accent transition-colors;
  }

  /* ---- Excerpt ---- */
  .timeline-excerpt {
    @apply text-text-dim text-sm line-clamp-3 leading-relaxed;
  }

  /* ---- Pinned badge ---- */
  .timeline-pinned {
    @apply inline-flex items-center gap-1 px-2 py-0.5 rounded text-xs font-semibold;
  }

  /* ---- Type-color variants (node, connector, card) ---- */

  /* Tech (purple) */
  .timeline-node--tech {
    background-color: var(--type-tech);
    box-shadow: 0 0 12px color-mix(in srgb, var(--type-tech) 40%, transparent);
  }
  .timeline-connector--tech {
    background-color: var(--type-tech);
  }
  .timeline-card--tech {
    border-color: color-mix(in srgb, var(--type-tech) 25%, transparent);
    box-shadow: 0 0 18px color-mix(in srgb, var(--type-tech) 10%, transparent);
  }

  /* Life (amber) */
  .timeline-node--life {
    background-color: var(--type-life);
    box-shadow: 0 0 12px color-mix(in srgb, var(--type-life) 40%, transparent);
  }
  .timeline-connector--life {
    background-color: var(--type-life);
  }
  .timeline-card--life {
    border-color: color-mix(in srgb, var(--type-life) 25%, transparent);
    box-shadow: 0 0 18px color-mix(in srgb, var(--type-life) 10%, transparent);
  }

  /* Quote (green) */
  .timeline-node--quote {
    background-color: var(--type-quote);
    box-shadow: 0 0 12px color-mix(in srgb, var(--type-quote) 40%, transparent);
  }
  .timeline-connector--quote {
    background-color: var(--type-quote);
  }
  .timeline-card--quote {
    border-color: color-mix(in srgb, var(--type-quote) 25%, transparent);
    box-shadow: 0 0 18px color-mix(in srgb, var(--type-quote) 10%, transparent);
  }

  /* Link (cyan) */
  .timeline-node--link {
    background-color: var(--type-link);
    box-shadow: 0 0 12px color-mix(in srgb, var(--type-link) 40%, transparent);
  }
  .timeline-connector--link {
    background-color: var(--type-link);
  }
  .timeline-card--link {
    border-color: color-mix(in srgb, var(--type-link) 25%, transparent);
    box-shadow: 0 0 18px color-mix(in srgb, var(--type-link) 10%, transparent);
  }

  /* Photo (pink) */
  .timeline-node--photo {
    background-color: var(--type-photo);
    box-shadow: 0 0 12px color-mix(in srgb, var(--type-photo) 40%, transparent);
  }
  .timeline-connector--photo {
    background-color: var(--type-photo);
  }
  .timeline-card--photo {
    border-color: color-mix(in srgb, var(--type-photo) 25%, transparent);
    box-shadow: 0 0 18px color-mix(in srgb, var(--type-photo) 10%, transparent);
  }

  /* ---- Timeline lazy-reveal (scroll-triggered) ---- */
  .js-lazy-timeline > .timeline-item {
    opacity: 0;
    transform: translateX(-18px);
    transition: opacity 320ms ease-out, transform 320ms ease-out;
  }

  @screen md {
    .js-lazy-timeline > .timeline-item--right {
      transform: translateX(18px);
    }
  }

  .js-lazy-timeline > .timeline-item.is-visible {
    opacity: 1;
    transform: translateX(0);
  }

  /* Header navigation styling */
  .header {
    @apply fixed top-0 left-0 right-0 z-40;
  }

  .header-nav {
    @apply hidden md:flex items-center gap-6;
  }

  .nav-link {
    @apply text-text hover:text-accent transition-colors;
  }

  .header-actions {
    @apply flex items-center gap-4;
  }

  /* Mobile menu overlay */
  .menu-overlay {
    @apply fixed inset-0 bg-bg z-40 opacity-0 invisible transition-all duration-300;
  }

  .menu-overlay.active {
    @apply opacity-100 visible;
  }

  .menu-nav {
    @apply flex flex-col gap-4 p-6 text-lg font-semibold;
  }

  .menu-nav a {
    @apply text-text hover:text-accent transition-colors;
  }

  /* Breadcrumb navigation */
  .breadcrumb {
    @apply flex items-center gap-2 text-sm text-text-dim;
  }

  .breadcrumb a {
    @apply hover:text-accent transition-colors;
  }

  .breadcrumb-separator {
    @apply opacity-50;
  }

  /* Article metadata styling (with icons) */
  .article-meta {
    @apply flex flex-wrap items-center gap-4 text-sm text-text-dim;
  }

  .article-meta-item {
    @apply flex items-center gap-2;
  }

  .article-meta-item i {
    @apply w-4 h-4 flex-shrink-0;
    color: var(--accent2);
  }

  /* Hero typography with fluid sizing */
  .hero-title {
    font-size: clamp(2rem, 5vw + 1rem, 4.5rem);
  }

  .section-title {
    font-size: clamp(1.5rem, 3vw + 0.5rem, 2.5rem);
  }

  /* ---- Article prev/next navigation ---- */
  .article-nav {
  }

  .article-nav-prompt {
    @apply font-mono text-sm mb-2;
    color: var(--accent);
  }

  .article-nav-links {
    @apply flex flex-col md:flex-row md:justify-between md:items-center gap-4 md:gap-0 font-mono text-sm;
  }

  .article-nav-link {
    @apply hover:text-accent transition-colors text-text;
  }

  .article-nav-placeholder {
    @apply text-text-dim opacity-40;
  }

  /* ---- Footer badge variants ---- */
  .badge-footer-accent {
    @apply inline-flex items-center px-2.5 py-1 rounded text-xs font-mono font-semibold whitespace-nowrap;
    border: 1px solid rgba(168, 85, 247, 0.35);
    background: rgba(168, 85, 247, 0.1);
    color: var(--accent);
  }

  .badge-footer-accent2 {
    @apply inline-flex items-center px-2.5 py-1 rounded text-xs font-mono font-semibold whitespace-nowrap;
    border: 1px solid rgba(0, 255, 136, 0.35);
    background: rgba(0, 255, 136, 0.1);
    color: var(--accent2);
  }

  /* Back to top button */
  .back-to-top {
    @apply fixed bottom-6 right-6 z-40 w-11 h-11 rounded-full flex items-center justify-center;
    background: var(--accent);
    box-shadow: 0 0 12px rgba(var(--accent-rgb), 0.4);
    transition: background 200ms ease, box-shadow 200ms ease;
    color: #fff;
  }
  .back-to-top:hover {
    background: var(--accent);
    filter: brightness(0.85);
    box-shadow: 0 0 20px var(--accent);
  }
  .back-to-top:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
  }
}

/* Prose overrides for light theme */
html.theme-light .prose,
html.theme-light .prose-invert {
  color: var(--text);
}

html.theme-light .prose a,
html.theme-light .prose-invert a {
  color: var(--accent);
}

html.theme-light .prose strong,
html.theme-light .prose-invert strong {
  color: var(--text);
}

html.theme-light .prose code,
html.theme-light .prose-invert code {
  color: var(--accent2);
}

html.theme-light .prose pre,
html.theme-light .prose-invert pre {
  background-color: var(--surface);
  color: var(--text);
}

html.theme-light .prose h1,
html.theme-light .prose h2,
html.theme-light .prose h3,
html.theme-light .prose h4,
html.theme-light .prose h5,
html.theme-light .prose h6,
html.theme-light .prose-invert h1,
html.theme-light .prose-invert h2,
html.theme-light .prose-invert h3,
html.theme-light .prose-invert h4,
html.theme-light .prose-invert h5,
html.theme-light .prose-invert h6 {
  color: var(--text);
}

html.theme-light .prose blockquote,
html.theme-light .prose-invert blockquote {
  color: var(--text);
  border-left-color: var(--accent);
}

/* Responsive container utilities - mobile-first */
.container {
  @apply max-w-full px-4;
}

@media (min-width: 768px) {
  .container {
    @apply max-w-4xl px-6;
  }
}

@media (min-width: 1060px) {
  .container {
    @apply max-w-5xl px-8;
  }
}

/* Alpine.js x-cloak - hide content until Alpine initializes */
[x-cloak] {
  display: none !important;
}

/* Respect user's motion preferences */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Matrix rain canvas background */
#matrix-rain {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}

/* Dark theme: 13% opacity (inner pages) */
html.theme-dark #matrix-rain {
  opacity: 0.13;
}

/* Light theme: 18% opacity (inner pages) */
html.theme-light #matrix-rain {
  opacity: 0.18;
}

/* Homepage: more prominent background */
html.theme-dark body[data-page-kind="home"] #matrix-rain {
  opacity: 0.28;
}

html.theme-light body[data-page-kind="home"] #matrix-rain {
  opacity: 0.35;
}

/* Reduced motion: hide canvas entirely */
@media (prefers-reduced-motion: reduce) {
  #matrix-rain {
    display: none;
  }
}

/* Content grid background — blocks rain under text, visible in gutters (single pages only) */
.content-grid {
  position: relative;
  z-index: 10;
  background-color: var(--bg);
  padding: 2px;
  border: 1px solid var(--border);
  box-shadow: 0 0 20px var(--accent-glow);
}

@media (min-width: 768px) {
  .content-grid {
    padding: 2rem;
  }
}

/* Article list items — soft glow effect */
article.border.border-border\/30.rounded-lg.overflow-hidden.group.bg-bg {
  border-color: var(--border);
  box-shadow: 0 0 20px var(--accent-glow);
}

/* ============================================
   FORM COMPONENTS (Week 4)
   ============================================ */

/* Form input base styles */
.form-input,
.form-textarea,
.form-select {
  @apply w-full px-4 py-2 rounded border border-border bg-bg2 text-text font-body transition-all duration-200;
}

/* Input placeholder styling */
.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-dim);
  opacity: 0.7;
}

/* Input focus state */
.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  @apply outline-none border-accent ring-2 ring-accent ring-offset-2;
  ring-offset-color: var(--bg);
  border-color: var(--accent);
}

/* Input invalid/error state */
.form-input:invalid,
.form-textarea:invalid,
.form-select:invalid,
.form-input.error,
.form-textarea.error,
.form-select.error {
  @apply border-red-500 ring-red-500;
}

.form-input:invalid:focus,
.form-textarea:invalid:focus,
.form-select:invalid:focus {
  @apply ring-red-500 border-red-500;
  ring-offset-color: var(--bg);
}

/* Input disabled state */
.form-input:disabled,
.form-textarea:disabled,
.form-select:disabled {
  @apply opacity-50 cursor-not-allowed bg-muted;
}

/* Textarea specific */
.form-textarea {
  @apply min-h-32;
  resize: vertical;
}

.form-textarea.auto-expand {
  resize: none;
  overflow-y: hidden;
}

/* Select dropdown */
.form-select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23a855f7' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  padding-right: 2.5rem;
}

html.theme-light .form-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%239333ea' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
}

/* Checkbox and radio button base */
.form-checkbox,
.form-radio {
  @apply w-5 h-5 cursor-pointer accent-accent transition-all duration-200;
  appearance: none;
  border: 2px solid var(--border);
  border-radius: 0.375rem;
  flex-shrink: 0;
}

.form-radio {
  border-radius: 50%;
}

/* Checkbox/radio focus state */
.form-checkbox:focus-visible,
.form-radio:focus-visible {
  @apply outline-none ring-2 ring-accent ring-offset-2;
  ring-offset-color: var(--bg);
}

/* Checkbox/radio checked state */
.form-checkbox:checked,
.form-radio:checked {
  background-color: var(--accent);
  border-color: var(--accent);
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 16 16' fill='white' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M12.207 4.793a1 1 0 010 1.414l-5 5a1 1 0 01-1.414 0l-2-2a1 1 0 011.414-1.414L6.5 9.086l4.293-4.293a1 1 0 011.414 0z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
  background-size: 100%;
}

.form-radio:checked {
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 16 16' fill='white' xmlns='http://www.w3.org/2000/svg'%3E%3Ccircle cx='8' cy='8' r='3.5'/%3E%3C/svg%3E");
}

/* Checkbox/radio disabled state */
.form-checkbox:disabled,
.form-radio:disabled {
  @apply opacity-50 cursor-not-allowed;
  border-color: var(--muted);
}

/* Form group layout */
.form-group {
  @apply space-y-2;
}

.form-group label {
  @apply block text-sm font-semibold text-text;
}

.form-group.required label::after {
  content: ' *';
  color: #ef4444;
}

.form-group-input {
  @apply relative;
}

.form-group-help {
  @apply text-xs text-text-dim;
}

.form-group.error .form-group-help {
  @apply text-red-500;
}

.form-error {
  @apply text-sm text-red-500 mt-1;
}

/* Form layout utilities */
.form-row {
  @apply flex flex-col md:flex-row gap-4;
}

.form-row > .form-group {
  @apply flex-1;
}

.form-inline {
  @apply flex flex-col sm:flex-row items-end gap-4;
}

.form-inline .form-group {
  @apply flex-1;
}

.form-inline .btn {
  @apply h-10;
}

/* Character count indicator */
.form-char-count {
  @apply text-xs text-text-dim text-right;
}

.form-char-count.warning {
  @apply text-amber-500;
}

.form-char-count.error {
  @apply text-red-500;
}

/* ============================================
   FOCUS MANAGEMENT (Week 5)
   ============================================ */

/* Enhanced :focus-visible with accent color styling */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Respect motion preferences for focus indicator */
@media (prefers-reduced-motion: reduce) {
  :focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
  }
}

/* Button and link hover/focus transitions */
button,
a.btn,
.btn {
  transition: all 150ms ease-out;
}

button:hover,
a.btn:hover,
.btn:hover {
  opacity: 0.8;
  transform: translateY(-1px);
}

button:active,
a.btn:active,
.btn:active {
  transform: translateY(0);
}

/* Form input focus transitions with glow effect */
input,
textarea,
select {
  transition: all 200ms ease-out;
}

input:focus,
textarea:focus,
select:focus,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  box-shadow: 0 0 0 3px rgba(var(--accent-rgb), 0.1);
}

/* ============================================
   MODAL COMPONENTS (Week 4)
   ============================================ */

/* Modal backdrop */
.modal-backdrop {
  @apply fixed inset-0 bg-black/50 opacity-0 invisible transition-all duration-300 z-40;
  backdrop-filter: blur(2px);
}

.modal-backdrop.active {
  @apply opacity-100 visible;
}

/* Modal container */
.modal {
  @apply fixed inset-0 flex items-center justify-center opacity-0 invisible transition-all duration-300 z-50 p-4;
  pointer-events: none;
}

.modal.active {
  @apply opacity-100 visible;
  pointer-events: auto;
}

.modal.active .modal-backdrop {
  @apply opacity-100 visible;
  pointer-events: auto;
}

/* Modal content box */
.modal-content {
  @apply bg-bg2 border border-border rounded-lg shadow-2xl max-w-lg w-full max-h-[90vh] flex flex-col;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  animation: modalSlideUp 0.3s ease-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes modalSlideUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Modal header */
.modal-header {
  @apply flex items-start justify-between gap-4 p-6 border-b border-border;
}

.modal-title {
  @apply text-xl font-bold text-text;
}

.modal-close {
  @apply flex items-center justify-center w-8 h-8 rounded hover:bg-surface cursor-pointer transition-colors;
}

.modal-close::before,
.modal-close::after {
  content: '';
  @apply absolute w-5 h-0.5 bg-text-dim;
}

.modal-close::before {
  transform: rotate(45deg);
}

.modal-close::after {
  transform: rotate(-45deg);
}

.modal-close:hover::before,
.modal-close:hover::after {
  @apply bg-accent;
}

/* Modal body */
.modal-body {
  @apply flex-1 overflow-y-auto p-6 space-y-4;
}

/* Modal footer */
.modal-footer {
  @apply flex items-center justify-end gap-3 p-6 border-t border-border;
}

/* Modal sizes */
.modal-content.modal-sm {
  @apply max-w-sm;
}

.modal-content.modal-md {
  @apply max-w-md;
}

.modal-content.modal-lg {
  @apply max-w-2xl;
}

/* Modal variants */
.modal-content.modal-alert {
  @apply max-w-sm;
}

.modal-content.modal-confirm {
  @apply max-w-sm;
}

/* Modal button styling */
.modal-footer .btn {
  @apply min-w-[100px];
}

/* ============================================
   INTERACTIVE PATTERNS (Week 4)
   ============================================ */

/* Loading spinner */
.spinner {
  @apply inline-block;
  width: 1rem;
  height: 1rem;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

.spinner-sm {
  width: 0.75rem;
  height: 0.75rem;
  border-width: 1.5px;
}

.spinner-lg {
  width: 1.5rem;
  height: 1.5rem;
  border-width: 3px;
}

/* Button with spinner */
.btn:disabled .spinner {
  @apply inline-block mr-2;
}

/* Toast notification container */
.toast-container {
  @apply fixed bottom-0 right-0 p-4 space-y-3 max-w-sm z-50;
}

@media (max-width: 640px) {
  .toast-container {
    @apply left-0 right-0 px-4;
  }
}

/* Toast base */
.toast {
  @apply flex items-start gap-3 p-4 rounded-lg border border-border shadow-lg;
  animation: slideInUp 0.3s ease-out;
  background-color: var(--bg2);
  color: var(--text);
}

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

/* Animation Utility Classes */

.animate-fade-in {
  animation: fadeIn 300ms ease-out;
}

.animate-slide-up {
  animation: slideUp 300ms ease-out;
}

.animate-spin-loader {
  animation: spin 600ms linear infinite;
}

/* Toast variants */
.toast-success {
  border-color: #10b981;
  background-color: rgba(16, 185, 129, 0.1);
}

.toast-success::before {
  content: '✓';
  color: #10b981;
  font-weight: bold;
  flex-shrink: 0;
}

.toast-error {
  border-color: #ef4444;
  background-color: rgba(239, 68, 68, 0.1);
}

.toast-error::before {
  content: '✕';
  color: #ef4444;
  font-weight: bold;
  flex-shrink: 0;
}

.toast-info {
  border-color: #3b82f6;
  background-color: rgba(59, 130, 246, 0.1);
}

.toast-info::before {
  content: 'ℹ';
  color: #3b82f6;
  flex-shrink: 0;
}

.toast-warning {
  border-color: #f59e0b;
  background-color: rgba(245, 158, 11, 0.1);
}

.toast-warning::before {
  content: '⚠';
  color: #f59e0b;
  flex-shrink: 0;
}

.toast-close {
  @apply ml-auto flex-shrink-0 w-6 h-6 flex items-center justify-center cursor-pointer hover:bg-surface rounded transition-colors;
}

/* Tooltip */
.tooltip {
  @apply relative inline-block;
}

.tooltip-text {
  @apply absolute bg-bg2 text-text-dim text-xs rounded px-2 py-1 whitespace-nowrap pointer-events-none opacity-0 invisible transition-all duration-200;
  z-index: 50;
  bottom: 125%;
  left: 50%;
  transform: translateX(-50%);
}

.tooltip:hover .tooltip-text {
  @apply opacity-100 visible;
}

.tooltip-text::after {
  content: '';
  @apply absolute w-2 h-2 bg-bg2;
  bottom: -4px;
  left: 50%;
  transform: translateX(-50%) rotate(45deg);
}

/* Tooltip directions */
.tooltip-bottom .tooltip-text {
  @apply top-[125%] bottom-auto;
}

.tooltip-bottom .tooltip-text::after {
  @apply top-[-4px] bottom-auto;
  transform: translateX(-50%) rotate(225deg);
}

.tooltip-left .tooltip-text {
  @apply left-auto right-[125%];
  transform: none;
}

.tooltip-left .tooltip-text::after {
  @apply left-auto right-[-4px];
  transform: rotate(135deg);
}

.tooltip-right .tooltip-text {
  @apply left-[125%];
  transform: none;
}

.tooltip-right .tooltip-text::after {
  @apply left-[-4px] right-auto;
  transform: rotate(315deg);
}

/* Obsolete article banner */
.banner-obsolete {
  margin: 1.5rem 0;
  padding: 1rem 1.25rem;
  border-left: 4px solid var(--type-life);
  border-radius: 0.5rem;
  background-color: rgba(245, 158, 11, 0.08);
}

.banner-obsolete__inner {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  color: var(--type-life);
}

.banner-obsolete__inner svg {
  flex-shrink: 0;
  margin-top: 0.125rem;
  color: var(--type-life);
}

.banner-obsolete__body {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  flex: 1;
}

.banner-obsolete__body p {
  color: var(--text);
  font-size: 0.9rem;
  margin: 0;
}

.banner-obsolete__cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  align-self: center;
  padding: 0.4rem 1rem;
  border: 1px solid var(--type-life);
  border-radius: 0.375rem;
  color: var(--type-life);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  transition: background-color 0.2s;
}

.banner-obsolete__cta:hover {
  background-color: rgba(245, 158, 11, 0.12);
}

/* Light theme override — #d97706 passes WCAG AA on white */
html.theme-light .banner-obsolete {
  background-color: rgba(217, 119, 6, 0.07);
  border-left-color: var(--type-life);
}

/* Motion Safety - Respect prefers-reduced-motion */

@media (prefers-reduced-motion: reduce) {
  /* Remove all animations */
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }

  /* Ensure focus-visible is still visible */
  :focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
  }
}