@import "tailwindcss";
@plugin "@tailwindcss/typography";

/* Light mode defaults (:root) */
:root {
  color-scheme: light;
  --bg-app: #f8fafc;
  --bg-surface: #ffffff;
  --bg-surface-hover: #f1f5f9;
  --bg-elevated: #f1f5f9;
  --bg-elevated-hover: #e2e8f0;
  --border-color: #e2e8f0;
  --border-subtle: #edf2f7;
  --border-card: #e2e8f0;

  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-dim: #94a3b8;

  --brand: #4f46e5;
  --brand-hover: #4338ca;
  --brand-glow: rgba(79, 70, 229, 0.15);
  --accent: #4f46e5;
  --accent-hover: #4338ca;
  --cyan-accent: #0284c7;

  --nav-bg: rgba(255, 255, 255, 0.85);

  /* Code & Syntax variables (Light Mode) */
  --code-bg: #f8fafc;
  --code-block-bg: #f8fafc;
  --code-header-bg: #f1f5f9;
  --border-code: #e2e8f0;
  --code-button-bg: #ffffff;
  --code-button-hover-bg: #e2e8f0;
  --pre-text: #1e293b;
  --code-inline-bg: #f1f5f9;
  --code-inline-text: #0f172a;
  --code-inline-border: #e2e8f0;

  --table-zebra: rgba(241, 245, 249, 0.6);
  --scrollbar-thumb: #cbd5e1;
  --scrollbar-thumb-hover: #94a3b8;
  --shadow-card: 0 1px 3px 0 rgba(0, 0, 0, 0.05), 0 1px 2px -1px rgba(0, 0, 0, 0.05);

  /* Syntax Highlighting (Light Mode) */
  --hl-keyword: #cf222e;
  --hl-string: #0a3069;
  --hl-title: #8250df;
  --hl-attr: #953800;
  --hl-number: #0550ae;
  --hl-comment: #6e7781;
  --hl-builtin: #0969da;
  --hl-operator: #57606a;
  --hl-variable: #953800;
  --hl-meta: #6e7781;

  /* Grid overlay */
  --grid-pattern: rgba(15, 23, 42, 0.03);
}

/* Dark mode overrides (html.dark) */
html.dark {
  color-scheme: dark;
  --bg-app: #08090d;
  --bg-surface: #0e1117;
  --bg-surface-hover: #141822;
  --bg-elevated: #151a26;
  --bg-elevated-hover: #1e2436;
  --border-color: #1e2536;
  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-card: #1e2536;

  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #8492a6;
  --text-dim: #505c70;

  --brand: #6366f1;
  --brand-hover: #818cf8;
  --brand-glow: rgba(99, 102, 241, 0.22);
  --accent: #818cf8;
  --accent-hover: #a5b4fc;
  --cyan-accent: #38bdf8;

  --nav-bg: rgba(8, 9, 13, 0.85);

  /* Code & Syntax variables (Dark Mode) */
  --code-bg: #0b0e14;
  --code-block-bg: #0a0d14;
  --code-header-bg: #111520;
  --border-code: #202738;
  --code-button-bg: #151a26;
  --code-button-hover-bg: #202738;
  --pre-text: #e2e8f0;
  --code-inline-bg: #131722;
  --code-inline-text: #e2e8f0;
  --code-inline-border: #202738;

  --table-zebra: rgba(255, 255, 255, 0.02);
  --scrollbar-thumb: #1e2536;
  --scrollbar-thumb-hover: #313c54;
  --shadow-card: none;

  /* Syntax Highlighting (Dark Mode) */
  --hl-keyword: #ff7b72;
  --hl-string: #a5d6ff;
  --hl-title: #d2a8ff;
  --hl-attr: #ffa657;
  --hl-number: #79c0ff;
  --hl-comment: #8b949e;
  --hl-builtin: #7ee787;
  --hl-operator: #8b949e;
  --hl-variable: #ffa657;
  --hl-meta: #8b949e;

  /* Grid overlay */
  --grid-pattern: rgba(255, 255, 255, 0.025);
}

@theme inline {
  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Monaco, Consolas, monospace;

  --color-background: var(--bg-app);
  --color-surface: var(--bg-surface);
  --color-surface-hover: var(--bg-surface-hover);
  --color-elevated: var(--bg-elevated);
  --color-elevated-hover: var(--bg-elevated-hover);
  --color-border: var(--border-color);
  --border-code: var(--border-code);
  --color-border-subtle: var(--border-subtle);

  --color-text-primary: var(--text-primary);
  --color-text-secondary: var(--text-secondary);
  --color-text-tertiary: var(--text-muted);
  --color-text-quaternary: var(--text-dim);

  --color-brand: var(--brand);
  --color-brand-hover: var(--brand-hover);
  --color-accent: var(--accent);
  --color-accent-hover: var(--accent-hover);
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-app);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-feature-settings: "cv01", "ss03", "zero";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.25s ease, color 0.25s ease;
  position: relative;
  min-height: 100vh;
}

/* Background subtle tech grid */
.tech-grid-bg {
  background-size: 32px 32px;
  background-image: linear-gradient(to right, var(--grid-pattern) 1px, transparent 1px),
                    linear-gradient(to bottom, var(--grid-pattern) 1px, transparent 1px);
}

/* Custom scrollbar */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: 9999px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--scrollbar-thumb-hover);
}

/* Glassmorphism helpers */
.glass-panel {
  background: var(--bg-surface);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
}

.glass-nav {
  background: var(--nav-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.glow-card {
  position: relative;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.glow-card:hover {
  transform: translateY(-2px);
  border-color: var(--brand);
  box-shadow: 0 8px 30px -10px var(--brand-glow);
}

/* Callout Alert Styles */
.callout {
  border-left-width: 4px;
  border-radius: 0 0.5rem 0.5rem 0;
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
}

.callout-note {
  border-left-color: #6366f1;
  background-color: rgba(99, 102, 241, 0.08);
}

.callout-tip {
  border-left-color: #10b981;
  background-color: rgba(16, 185, 129, 0.08);
}

.callout-important {
  border-left-color: #8b5cf6;
  background-color: rgba(139, 92, 246, 0.08);
}

.callout-warning {
  border-left-color: #f59e0b;
  background-color: rgba(245, 158, 11, 0.08);
}

.callout-caution {
  border-left-color: #ef4444;
  background-color: rgba(239, 68, 68, 0.08);
}

/* Prose markdown typography for both Light and Dark modes */
.prose {
  color: var(--text-secondary) !important;
  max-width: 100% !important;
}

.prose h1, .prose h2, .prose h3, .prose h4, .prose strong {
  color: var(--text-primary) !important;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.prose a {
  color: var(--accent) !important;
  text-decoration: none;
  font-weight: 500;
  transition: color 0.15s ease;
}

.prose a:hover {
  color: var(--accent-hover) !important;
  text-decoration: underline;
}

.prose table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 2rem 0;
  font-size: 0.875rem;
  border-radius: 0.75rem;
  overflow: hidden;
  border: 1px solid var(--border-color);
  background: var(--bg-surface);
}

.prose th,
.prose td {
  padding: 0.875rem 1.125rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.prose th {
  background: var(--bg-elevated);
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-family: var(--font-mono);
}

.prose td {
  color: var(--text-secondary);
}

.prose tbody tr:last-child td {
  border-bottom: none;
}

.prose tbody tr:hover {
  background: var(--bg-elevated-hover);
}

.prose tbody tr:nth-child(even) {
  background: var(--table-zebra);
}

.prose pre {
  background: var(--code-block-bg) !important;
  color: var(--pre-text) !important;
  border: 1px solid var(--border-code);
  border-radius: 0.75rem;
  padding: 1.25rem;
  overflow-x: auto;
  position: relative;
  font-family: var(--font-mono);
  line-height: 1.6;
}

.prose code {
  font-family: var(--font-mono);
  font-size: 0.875em;
}

.prose :not(pre) > code {
  background: var(--code-inline-bg);
  color: var(--code-inline-text);
  border: 1px solid var(--code-inline-border);
  padding: 0.15rem 0.4rem;
  border-radius: 0.375rem;
  font-weight: 500;
}

.prose :not(pre) > code::before,
.prose :not(pre) > code::after {
  content: none !important;
}

.prose blockquote {
  border-left: 3px solid var(--brand);
  background: rgba(99, 102, 241, 0.08);
  border-radius: 0 0.5rem 0.5rem 0;
  margin: 1.75em 0;
  padding: 0.875em 1.25em;
  font-style: normal;
  color: var(--text-secondary);
}

.prose hr {
  border-color: var(--border-color);
  margin: 2.5rem 0;
}

/* Syntax Highlighting Tokens (Highlight.js) */
.hljs {
  color: var(--pre-text);
  background: transparent;
}

.hljs-keyword,
.hljs-selector-tag,
.hljs-subst,
.hljs-doctag {
  color: var(--hl-keyword);
  font-weight: 600;
}

.hljs-string,
.hljs-regexp,
.hljs-link {
  color: var(--hl-string);
}

.hljs-title,
.hljs-title.function_,
.hljs-title.class_,
.hljs-section {
  color: var(--hl-title);
  font-weight: 600;
}

.hljs-attr,
.hljs-attribute,
.hljs-variable,
.hljs-template-variable,
.hljs-type {
  color: var(--hl-attr);
}

.hljs-number,
.hljs-literal {
  color: var(--hl-number);
}

.hljs-comment,
.hljs-quote {
  color: var(--hl-comment);
  font-style: italic;
}

.hljs-built_in,
.hljs-symbol,
.hljs-bullet {
  color: var(--hl-builtin);
}

.hljs-meta,
.hljs-meta .hljs-keyword,
.hljs-meta .hljs-string {
  color: var(--hl-meta);
}

.hljs-params {
  color: var(--pre-text);
}

.hljs-punctuation,
.hljs-operator {
  color: var(--hl-operator);
}

.hljs-addition {
  color: #10b981;
  background-color: rgba(16, 185, 129, 0.15);
  border-radius: 2px;
}

.hljs-deletion {
  color: #ef4444;
  background-color: rgba(239, 68, 68, 0.15);
  border-radius: 2px;
}

.hljs-emphasis {
  font-style: italic;
}

.hljs-strong {
  font-weight: bold;
}

/* Keyframes & Animation utilities */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes pulseGlow {
  0%, 100% { opacity: 0.6; }
  50% { opacity: 1; filter: drop-shadow(0 0 8px var(--brand)); }
}

.animate-fade-in {
  animation: fadeIn 0.25s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.animate-slide-down {
  animation: slideDown 0.2s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.animate-pulse-glow {
  animation: pulseGlow 2.5s ease-in-out infinite;
}

/* Print & PDF Export Stylesheet */
@media print {
  @page {
    size: A4 portrait;
    margin: 18mm 15mm 18mm 15mm;
  }

  *, *::before, *::after {
    -webkit-print-color-adjust: exact !important;
    print-color-adjust: exact !important;
  }

  html, body {
    background-color: #ffffff !important;
    color: #0f172a !important;
    font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif !important;
    font-size: 10pt !important;
    line-height: 1.5 !important;
    margin: 0 !important;
    padding: 0 !important;
    width: 100% !important;
  }

  header,
  aside,
  footer,
  nav.site-header,
  .no-print,
  .export-toolbar,
  #a11y-live-region {
    display: none !important;
  }

  main,
  .print-container {
    max-width: 100% !important;
    width: 100% !important;
    margin: 0 !important;
    padding: 0 !important;
    border: none !important;
    box-shadow: none !important;
    background: transparent !important;
  }

  .page-break-before,
  .chapter-page,
  .challenge-entry {
    break-before: page !important;
    page-break-before: always !important;
  }

  .avoid-break-inside,
  .code-block-wrapper,
  .code-block-container,
  .challenge-entry,
  table,
  tr,
  img,
  pre,
  blockquote {
    break-inside: avoid !important;
    page-break-inside: avoid !important;
  }

  img {
    max-width: 100% !important;
    height: auto !important;
  }

  .code-block-wrapper,
  .code-block-container {
    break-inside: avoid !important;
    page-break-inside: avoid !important;
    border: 1px solid #cbd5e1 !important;
    background-color: #f8fafc !important;
    border-radius: 4px !important;
    margin: 8pt 0 !important;
    overflow: hidden !important;
  }

  .code-block-header {
    border-bottom: 1px solid #cbd5e1 !important;
    background-color: #f1f5f9 !important;
    padding: 3pt 8pt !important;
    color: #334155 !important;
  }

  .code-block-wrapper pre {
    border: none !important;
    background-color: transparent !important;
    padding: 6pt 8pt !important;
    margin: 0 !important;
    border-radius: 0 !important;
  }

  pre,
  pre code,
  code {
    white-space: pre-wrap !important;
    word-break: break-all !important;
    overflow-wrap: anywhere !important;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace !important;
    font-size: 8.5pt !important;
    line-height: 1.4 !important;
  }
}