/* Si-Chip / NieR: Automata-styled Jekyll layout - v0.1.0 */
/* 1. :root design tokens */
:root {
  --bg:          #D2CDB7;   /* weathered paper */
  --bg-soft:     #C8C2A6;   /* code blocks, alt rows */
  --fg:          #3F3A2C;   /* deep olive-brown body */
  --fg-soft:     #5A553F;   /* secondary, captions */
  --accent:      #171614;   /* near-black borders */
  --rust:        #74573D;   /* rare warning highlight */
  --blood:       #5A2A1F;   /* OUT OF SCOPE badges */

  --font-display: 'Saira Stencil One', 'Impact', sans-serif;
  --font-section: 'B612 Mono', 'Courier New', monospace;
  --font-body:    "Noto Sans SC", "Noto Sans JP", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono:    'B612 Mono', 'Courier New', monospace;

  --space-xs: 0.4rem;
  --space-sm: 0.8rem;
  --space-md: 1.4rem;
  --space-lg: 2.2rem;
  --space-xl: 3.4rem;

  --content-width: 64rem;
  --frame-inset: 8px;
}

/* 2. CSS reset (minimal) */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
img, svg, video { max-width: 100%; height: auto; display: block; }
button, input, select, textarea { font: inherit; color: inherit; }
ul, ol { padding-left: 1.4em; }
h1, h2, h3, h4, h5, h6, p, ul, ol, pre, blockquote, table { margin: 0 0 var(--space-md) 0; }

/* 3. body.nier - base background + subtle SVG noise */
body.nier {
  background-color: var(--bg);
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0  0 0 0 0 0  0 0 0 0 0  0 0 0 0.04 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
  background-repeat: repeat;
  color: var(--fg);
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.65;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* 4. .scanlines overlay */
.scanlines {
  position: fixed;
  inset: 0;
  pointer-events: none;
  mix-blend-mode: multiply;
  opacity: 0.06;
  background-image: repeating-linear-gradient(
    to bottom,
    rgba(0, 0, 0, 0) 0,
    rgba(0, 0, 0, 0) 1px,
    rgba(0, 0, 0, 1) 1px,
    rgba(0, 0, 0, 1) 2px
  );
  z-index: 9999;
}

/* 5. Hero (header) + nav */
.hero {
  padding: var(--space-lg) var(--space-md) var(--space-md);
  max-width: var(--content-width);
  margin: 0 auto;
}
.hero-frame {
  position: relative;
  padding: var(--space-lg) var(--space-md);
  box-shadow:
    inset 0 0 0 1px var(--accent),
    inset 0 0 0 8px var(--bg),
    inset 0 0 0 9px var(--accent);
  background: transparent;
}
.hero-meta {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--fg-soft);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-sm);
}
.hero-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.4rem, 6vw, 4.4rem);
  line-height: 1;
  margin: 0 0 var(--space-sm) 0;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
}
.hero-title .bracket {
  font-size: 1.18em;
  color: var(--fg-soft);
  padding: 0 0.18em;
  position: relative;
  top: -0.04em;
}
.hero-subtitle {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--fg);
  margin: 0 0 var(--space-md) 0;
  opacity: 0;
  animation: fadein 200ms linear forwards;
  animation-delay: 60ms;
}
.hero-subtitle .cursor {
  display: inline-block;
  margin-left: 0.2em;
  color: var(--accent);
  font-family: var(--font-mono);
  transition: opacity 0ms;
}
.hero-subtitle .cursor.blink-off { opacity: 0; }
.hero-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin-top: var(--space-sm);
  border-top: 1px dotted var(--fg-soft);
  padding-top: var(--space-sm);
}
.nav-link {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--fg);
  text-decoration: none;
  padding: 0.35em 0.7em;
  margin-right: 0.4em;
  margin-bottom: 0.3em;
  border: 1px solid transparent;
  transition: background-color 80ms linear, color 80ms linear, border-color 80ms linear;
}
.nav-link:hover,
.nav-link:focus {
  background-color: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
  outline: none;
}

/* 6. .content / .page chrome */
.content {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 var(--space-md) var(--space-xl);
}
.page {
  position: relative;
  padding: var(--space-lg) var(--space-md);
  box-shadow:
    inset 0 0 0 1px var(--accent),
    inset 0 0 0 8px var(--bg),
    inset 0 0 0 9px var(--accent);
}
.page-meta {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--fg-soft);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  text-align: right;
  margin-bottom: var(--space-sm);
}
.page-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin: 0 0 var(--space-xs) 0;
  line-height: 1.05;
}
.page-divider {
  font-family: var(--font-mono);
  color: var(--fg-soft);
  font-size: 0.85rem;
  letter-spacing: 0;
  white-space: nowrap;
  overflow: hidden;
  margin: 0 0 var(--space-md) 0;
  user-select: none;
}
.page-body { font-family: var(--font-body); }

/* 7. Markdown body styles inside .page-body */
.page-body h2,
.page-body h3,
.page-body h4 {
  font-family: var(--font-section);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
  line-height: 1.2;
}
.page-body h2 { font-size: 1.4rem; border-bottom: 1px solid var(--accent); padding-bottom: 0.3em; }
.page-body h3 { font-size: 1.15rem; }
.page-body h4 { font-size: 1.0rem; color: var(--fg-soft); }
.page-body p { margin: 0 0 var(--space-md) 0; }

/* lists with filled-square bullets */
.page-body ul,
.page-body ol {
  list-style: none;
  padding-left: 1.4em;
  margin: 0 0 var(--space-md) 0;
}
.page-body ul li,
.page-body ol li {
  position: relative;
  padding-left: 0.4em;
  margin-bottom: 0.35em;
}
.page-body ul li::before {
  content: "\25AA";  /* small black square */
  position: absolute;
  left: -1.0em;
  color: var(--accent);
  font-size: 0.9em;
  top: 0.05em;
}
.page-body ol { counter-reset: nier-ol; }
.page-body ol li { counter-increment: nier-ol; }
.page-body ol li::before {
  content: counter(nier-ol, decimal-leading-zero) ".";
  position: absolute;
  left: -1.6em;
  color: var(--fg-soft);
  font-family: var(--font-mono);
  font-size: 0.85em;
  top: 0.15em;
}

/* tables */
.page-body table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  font-family: var(--font-body);
  font-size: 0.94rem;
  margin: 0 0 var(--space-md) 0;
}
.page-body table th {
  text-align: left;
  font-family: var(--font-mono);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  padding: 0.55em 0.7em;
  border-bottom: 2px solid var(--accent);
  background: transparent;
}
.page-body table td {
  padding: 0.55em 0.7em;
  border-bottom: 1px dotted var(--fg-soft);
  vertical-align: top;
}
.page-body table tr:last-child td { border-bottom: 1px solid var(--accent); }

/* code blocks */
.page-body pre {
  position: relative;
  background: var(--bg-soft);
  color: var(--fg);
  border: 1px solid var(--accent);
  border-radius: 0;
  padding: 1.4em 1em 1em;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  line-height: 1.55;
  margin: 0 0 var(--space-md) 0;
}
.page-body pre::before {
  content: "// CODE";
  position: absolute;
  top: 0.25em;
  right: 0.6em;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--fg-soft);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.page-body pre code {
  background: transparent;
  border: 0;
  padding: 0;
  font-size: inherit;
  color: inherit;
}

/* inline code */
.page-body code {
  background: var(--bg-soft);
  border: 1px solid var(--accent);
  padding: 0 0.3em;
  font-family: var(--font-mono);
  font-size: 0.88em;
  color: var(--accent);
  border-radius: 0;
}

/* blockquotes */
.page-body blockquote {
  border-left: 4px solid var(--rust);
  padding: 0.4em 0 0.4em 1em;
  font-style: italic;
  color: var(--fg-soft);
  margin: 0 0 var(--space-md) 0;
  background: transparent;
}
.page-body blockquote p:last-child { margin-bottom: 0; }

/* links */
.page-body a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.25em;
  transition: background-color 80ms linear, color 80ms linear;
  padding: 0 0.1em;
}
.page-body a:hover,
.page-body a:focus {
  background-color: var(--accent);
  color: var(--bg);
  text-decoration-color: var(--bg);
  outline: none;
}

.page-body strong { font-weight: 700; color: var(--accent); }
.page-body em { font-style: italic; color: var(--fg); }

/* mermaid placeholder fallback (raw block until Pages renders it) */
.page-body .language-mermaid {
  background: var(--bg-soft);
  border: 1px dashed var(--accent);
  padding: 1em;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  white-space: pre;
}

/* 8. .btn (terminal-command look) */
.page-body a.btn,
a.btn {
  display: inline-block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  background: transparent;
  border: 1px solid var(--accent);
  padding: 0.6em 1.2em;
  text-decoration: none;
  margin: 0 0.4em 0.6em 0;
  transition: background-color 80ms linear, color 80ms linear;
  border-radius: 0;
}
.page-body a.btn:hover,
.page-body a.btn:focus,
a.btn:hover,
a.btn:focus {
  background: var(--accent);
  color: var(--bg);
  text-decoration: none;
  outline: none;
}

/* 8b. .btn-green variant - secondary "go" call-to-action */
.page-body a.btn.btn-green,
a.btn.btn-green {
  color: #2D5A3F;
  border-color: #2D5A3F;
}
.page-body a.btn.btn-green:hover,
a.btn.btn-green:hover {
  background: #2D5A3F;
  color: var(--bg);
}
body[data-theme="night"] .page-body a.btn.btn-green,
body[data-theme="night"] a.btn.btn-green {
  color: #8FB996;
  border-color: #8FB996;
}
body[data-theme="night"] .page-body a.btn.btn-green:hover,
body[data-theme="night"] a.btn.btn-green:hover {
  background: #8FB996;
  color: var(--bg);
}

/* 9. Footer */
.footer {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: var(--space-md) var(--space-md) var(--space-xl);
  font-family: var(--font-mono);
  color: var(--fg);
}
.footer-divider {
  font-family: var(--font-mono);
  color: var(--fg-soft);
  font-size: 0.85rem;
  white-space: nowrap;
  overflow: hidden;
  margin-bottom: var(--space-sm);
  user-select: none;
}
.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-sm);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg);
  margin-bottom: var(--space-sm);
}
.footer-motto {
  font-family: var(--font-display);
  font-size: 1.1rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  text-align: center;
  margin: var(--space-md) 0;
}
.footer-link {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  justify-content: center;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
}
.footer-link a {
  color: var(--fg-soft);
  text-decoration: none;
  border-bottom: 1px dotted var(--fg-soft);
  padding-bottom: 1px;
  transition: color 80ms linear, border-color 80ms linear;
}
.footer-link a:hover,
.footer-link a:focus {
  color: var(--accent);
  border-bottom-color: var(--accent);
  outline: none;
}

/* 10. Responsive - small viewports */
@media (max-width: 720px) {
  .hero { padding: var(--space-md) var(--space-sm); }
  .hero-frame { padding: var(--space-md) var(--space-sm); }
  .hero-title { font-size: clamp(1.8rem, 9vw, 2.6rem); letter-spacing: 0.05em; }
  .hero-nav { flex-direction: column; align-items: flex-start; }
  .nav-link { width: 100%; margin-right: 0; }
  .content { padding: 0 var(--space-sm) var(--space-lg); }
  .page { padding: var(--space-md) var(--space-sm); }
  .page-body table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer { padding: var(--space-sm); }
}

/* 11. Animations - cursor blink + hero subtitle fade-in */
@keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: 0; } }
@keyframes fadein { from { opacity: 0; } to { opacity: 1; } }

/* 12. Print */
@media print {
  body.nier { background: white; color: black; }
  .scanlines { display: none; }
  .hero-frame, .page { box-shadow: none; border: 1px solid black; }
  .nav-link, .footer-link { color: black; }
  .page-body a { color: black; text-decoration: underline; }
}

/* 13. i18n display rules + responsive overflow ─────────────────────────── */
/* Both language blocks render in DOM; CSS hides one based on body[data-lang]. */
html[data-lang="en"] [lang="zh"]:not(html):not([data-i18n]),
body[data-lang="en"] [lang="zh"]:not(html):not([data-i18n]) { display: none; }
html[data-lang="zh"] [lang="en"]:not(html):not([data-i18n]),
body[data-lang="zh"] [lang="en"]:not(html):not([data-i18n]) { display: none; }

/* Responsive table overflow (fixes the demo-page report) */
.page-body table {
  display: block;
  max-width: 100%;
  overflow-x: auto;
  white-space: nowrap;
  margin: 1.2em 0;
  border-collapse: collapse;
}
.page-body table th,
.page-body table td {
  padding: 0.4em 0.9em;
}

@media (max-width: 720px) {
  .page-body table {
    font-size: 0.85em;
  }
}

/* 14. Dark mode (night) - mirror the day palette ──────────────────────── */
html[data-theme="night"],
body[data-theme="night"] {
  --bg:         #14120F;
  --bg-soft:    #1F1C18;
  --fg:         #D2CDB7;
  --fg-soft:    #8C8771;
  --accent:     #D2CDB7;
  --rust:       #B89A78;
  --blood:      #A04438;
}
/* Soften the scan-line overlay in night mode so it does not
   dominate the dark background. */
html[data-theme="night"] .scanlines,
body[data-theme="night"] .scanlines {
  opacity: 0.03;
  mix-blend-mode: screen;
}
/* Keep the cursor visible on dark bg. */
html[data-theme="night"] .cursor,
body[data-theme="night"] .cursor {
  color: var(--fg);
}

/* 15. Toggle controls (theme + lang) - top-right of the hero ──────────── */
.hero-controls {
  position: absolute;
  top: 1.2rem;
  right: 1.6rem;
  display: flex;
  gap: 0.6rem;
  font-family: var(--font-mono, "B612 Mono", monospace);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  z-index: 2;
}
.toggle {
  display: inline-block;
  cursor: pointer;
  padding: 0.25em 0.7em;
  border: 1px solid var(--accent);
  background: transparent;
  color: var(--accent);
  text-transform: uppercase;
  user-select: none;
  transition: background 80ms linear, color 80ms linear;
}
.toggle:hover,
.toggle:focus {
  background: var(--accent);
  color: var(--bg);
  outline: none;
}
.toggle:active {
  transform: translateY(1px);
}

@media (max-width: 720px) {
  .hero-controls {
    position: static;
    margin-top: 1em;
    justify-content: flex-end;
  }
  .toggle {
    font-size: 0.75rem;
  }
}

/* 16. Text selection - keep palette consistent across themes */
::selection { background: var(--accent); color: var(--bg); }
::-moz-selection { background: var(--accent); color: var(--bg); }

/* 17. Localized code-block labels (zh) and mermaid-aware label */
[lang="zh"] pre::before { content: "// 代码"; }
pre:has(code.language-mermaid)::before { content: "// DIAGRAM"; }
[lang="zh"] pre:has(code.language-mermaid)::before { content: "// 图表"; }

/* 18. Lang-specific body font - prefer Noto Sans SC for Simplified Chinese */
body.nier:lang(zh) { font-family: "Noto Sans SC", "Noto Sans JP", system-ui, sans-serif; }

/* 19. Skip-link - hidden until keyboard-focused */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  font-family: "B612 Mono", monospace;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.skip-link:focus {
  left: 0;
  top: 0;
  padding: 0.6em 1em;
  background: var(--accent);
  color: var(--bg);
  z-index: 10000;
  outline: 2px solid var(--accent);
}

/* 20. Reduced-motion - hold the hero subtitle steady */
@media (prefers-reduced-motion: reduce) {
  .hero-subtitle { opacity: 1 !important; animation: none !important; }
}