/* ============================================================
   DevolaFlow Design System — NieR: Automata / Devola Edition
   ============================================================ */
@import url('https://fonts.googleapis.com/css2?family=Cinzel:wght@400;700&family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

/* --- Design Tokens: Light Mode (Aged Parchment) --- */
:root {
  --bg: #F0EBE0; --fg: #3D3429; --card-bg: #FAF7F2; --border: #D4CBB8;
  --accent: #B8860B; --accent-hover: #9A7209; --accent-light: #F5EDD8;
  --muted: #8A7E6D; --success: #5B7553; --error: #B54040; --warning: #C49A3C;
  --code-bg: #EAE4D4; --secondary: #9B4444;
  --nav-height: 64px; --radius: 10px; --radius-sm: 5px;
  --shadow: 0 1px 4px rgba(61,52,41,.08);
  --shadow-lg: 0 8px 24px rgba(61,52,41,.12);
  --font-heading: 'Cinzel', 'Times New Roman', serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'SFMono-Regular', monospace;
}

/* --- Design Tokens: Dark Mode (The Bunker) --- */
.dark {
  --bg: #1A1714; --fg: #E8DFD0; --card-bg: #252018; --border: #3D3628;
  --accent: #D4A843; --accent-hover: #E8BC4E; --accent-light: #2A2418;
  --muted: #968D7C; --success: #7A9E70; --error: #D06060; --warning: #D4A843;
  --code-bg: #2A2520; --secondary: #C76B6B;
  --shadow: 0 1px 4px rgba(0,0,0,.3);
  --shadow-lg: 0 8px 24px rgba(0,0,0,.4);
}

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--fg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  padding-top: var(--nav-height);
  transition: background .3s, color .3s;
}
body::before {
  content: ''; position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background: repeating-conic-gradient(rgba(61,52,41,.015) 0% 25%, transparent 0% 50%) 0 0/4px 4px;
}
.dark body::before {
  background: repeating-conic-gradient(rgba(232,223,208,.02) 0% 25%, transparent 0% 50%) 0 0/4px 4px;
}
a { color: var(--accent); text-decoration: none; transition: color .15s; }
a:hover { color: var(--accent-hover); text-decoration: underline; }
img { max-width: 100%; display: block; }

/* --- Layout --- */
.container { max-width: 1080px; margin: 0 auto; padding: 0 1.5rem; }

/* --- Navigation Bar --- */
.site-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--nav-height);
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
  transition: background .3s;
}
.site-nav .nav-inner {
  max-width: 1080px; margin: 0 auto; padding: 0 1.5rem;
  display: flex; align-items: center; height: 100%; gap: 1rem;
}
.site-nav .nav-logo {
  font-family: var(--font-heading); font-size: 1.15rem; font-weight: 700;
  white-space: nowrap; text-decoration: none; color: var(--fg);
  letter-spacing: .04em;
}
.site-nav .nav-logo .logo-accent { color: var(--accent); }
.site-nav .nav-links {
  display: flex; gap: .25rem; margin: 0 auto; list-style: none; padding: 0;
}
.site-nav .nav-links a {
  padding: .4rem .75rem; border-radius: var(--radius-sm);
  font-size: .875rem; font-weight: 500; color: var(--muted);
  text-decoration: none; transition: color .15s, background .15s;
  position: relative;
}
.site-nav .nav-links a:hover { color: var(--fg); background: var(--accent-light); }
.site-nav .nav-links a.active { color: var(--accent); font-weight: 600; }
.site-nav .nav-links a.active::after {
  content: ''; position: absolute; bottom: -4px; left: .75rem; right: .75rem;
  height: 2px; background: var(--accent); border-radius: 1px;
}
.site-nav .nav-controls { display: flex; align-items: center; gap: .5rem; }

/* Theme toggle & lang switcher */
.theme-toggle, .lang-btn {
  background: var(--card-bg); border: 1px solid var(--border);
  border-radius: var(--radius-sm); cursor: pointer;
  color: var(--fg); font-size: .85rem; font-weight: 600;
  transition: border-color .15s, background .15s;
}
.theme-toggle {
  width: 2.25rem; height: 2.25rem; display: flex;
  align-items: center; justify-content: center; font-size: 1.1rem;
  border-radius: 50%;
}
.theme-toggle:hover, .lang-btn:hover { border-color: var(--accent); }
.lang-btn { padding: .3rem .6rem; }
.lang-btn .lang-option { opacity: .45; transition: opacity .15s; }
.lang-btn .lang-option.active { opacity: 1; color: var(--accent); }

/* Hamburger (mobile) */
.nav-hamburger {
  display: none; background: none; border: none; cursor: pointer;
  width: 2.25rem; height: 2.25rem; position: relative; color: var(--fg);
}
.nav-hamburger svg { width: 22px; height: 22px; }

/* Mobile overlay */
.nav-overlay {
  display: none; position: fixed; inset: 0; z-index: 99;
  background: rgba(26,23,20,.55); opacity: 0; transition: opacity .25s;
}
.nav-overlay.open { display: block; opacity: 1; }
.nav-mobile {
  position: fixed; top: 0; right: 0; bottom: 0; z-index: 100;
  width: 280px; background: var(--bg); border-left: 1px solid var(--border);
  transform: translateX(100%); transition: transform .25s ease;
  padding: 1.5rem; overflow-y: auto;
}
.nav-mobile.open { transform: translateX(0); }
.nav-mobile .mobile-links { list-style: none; padding: 0; margin-top: 1.5rem; }
.nav-mobile .mobile-links a {
  display: block; padding: .65rem .5rem; font-size: 1rem; font-weight: 500;
  color: var(--fg); text-decoration: none; border-radius: var(--radius-sm);
  transition: background .15s;
}
.nav-mobile .mobile-links a:hover { background: var(--accent-light); }
.nav-mobile .mobile-links a.active { color: var(--accent); font-weight: 600; }
.nav-mobile .mobile-close {
  background: none; border: none; cursor: pointer; font-size: 1.4rem;
  color: var(--muted); float: right;
}

/* --- Header --- */
header {
  padding: 3rem 0 2rem; text-align: center;
  border-bottom: 1px solid var(--border); position: relative;
}
header h1 {
  font-family: var(--font-heading); font-size: 2.4rem;
  font-weight: 700; margin-bottom: .25rem; letter-spacing: .03em;
}
header h1 .accent { color: var(--accent); }
.tagline { font-size: 1.1rem; color: var(--muted); margin-bottom: 1.5rem; }

/* --- Section Divider with Diamond Ornament --- */
section {
  padding: 2.5rem 0; position: relative;
  border-bottom: 1px solid var(--border);
}
section:last-child { border-bottom: none; }
section::before {
  content: '◆'; position: absolute; top: -0.55em; left: 50%;
  transform: translateX(-50%); background: var(--bg);
  padding: 0 .75rem; font-size: .55rem; color: var(--border);
  letter-spacing: .3em;
}
section:first-of-type::before { content: none; }
section h2 {
  font-family: var(--font-heading); font-size: 1.45rem;
  margin-bottom: 1rem; letter-spacing: .02em;
}
section p.desc { color: var(--muted); margin-bottom: 1.5rem; }

/* --- Cards with Gold Accent & Corner Marks --- */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1rem; }
.card {
  background: var(--card-bg); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.25rem;
  box-shadow: var(--shadow); position: relative;
  border-left: 3px solid transparent;
  transition: transform .2s, box-shadow .2s, border-color .2s;
}
.card:hover {
  transform: translateY(-2px); box-shadow: var(--shadow-lg);
  border-color: var(--border); border-left-color: var(--accent);
}
.card::before, .card::after {
  content: ''; position: absolute; width: 8px; height: 8px;
  border-color: var(--accent); opacity: 0;
  transition: opacity .2s;
}
.card::before { top: 6px; right: 6px; border-top: 1.5px solid; border-right: 1.5px solid; }
.card::after { bottom: 6px; left: 6px; border-bottom: 1.5px solid; border-left: 1.5px solid; }
.card:hover::before, .card:hover::after { opacity: .6; }
.card h3 { font-family: var(--font-heading); font-size: 1.02rem; margin-bottom: .25rem; }
.card p { font-size: .9rem; color: var(--muted); margin-bottom: .75rem; }
.card a { color: var(--accent); font-weight: 600; font-size: .9rem; text-decoration: none; }
.card a:hover { text-decoration: underline; }
.card .label {
  display: inline-block; font-size: .72rem; padding: .15rem .5rem;
  border-radius: 3px; background: var(--accent-light); color: var(--accent);
  margin-bottom: .5rem; font-weight: 600; text-transform: uppercase;
  letter-spacing: .04em;
}

/* --- Buttons --- */
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .6rem 1.2rem; border-radius: var(--radius-sm);
  font-weight: 600; font-size: .95rem; text-decoration: none;
  border: none; cursor: pointer; letter-spacing: .02em;
  transition: background .15s, color .15s, box-shadow .15s, opacity .15s;
}
.btn-primary { background: var(--accent); color: #FFFDF5; }
.btn-primary:hover { background: var(--accent-hover); text-decoration: none; }
.btn-outline {
  border: 1px solid var(--border); color: var(--fg); background: var(--card-bg);
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }
.btn-ghost { background: transparent; color: var(--fg); }
.btn-ghost:hover { background: var(--accent-light); color: var(--accent); text-decoration: none; }

/* --- Tables --- */
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
table { width: 100%; border-collapse: collapse; font-size: .9rem; }
th {
  text-align: left; padding: .6rem; font-weight: 600;
  border-bottom: 2px solid var(--accent); font-size: .82rem;
  text-transform: uppercase; letter-spacing: .04em; color: var(--muted);
}
td { padding: .5rem .6rem; border-bottom: 1px solid var(--border); }
tr:hover td { background: var(--accent-light); }

/* --- Metric Cards --- */
.metrics { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 1rem; }
.metric {
  background: var(--card-bg); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1rem; text-align: center;
}
.metric .k {
  font-size: .72rem; color: var(--muted);
  text-transform: uppercase; letter-spacing: .06em;
}
.metric .v {
  font-family: var(--font-heading); font-size: 1.5rem;
  font-weight: 700; color: var(--accent); margin-top: .25rem;
}

/* --- Badges (YoRHa Layer Colors) --- */
.badge {
  display: inline-block; padding: .15rem .5rem; border-radius: 3px;
  font-size: .72rem; font-weight: 600; letter-spacing: .03em;
}
.badge-accent  { background: var(--accent-light); color: var(--accent); }
.badge-success { background: color-mix(in srgb, var(--success) 15%, transparent); color: var(--success); }
.badge-error   { background: color-mix(in srgb, var(--error) 15%, transparent); color: var(--error); }
.badge-warning { background: color-mix(in srgb, var(--warning) 15%, transparent); color: var(--warning); }
.badge-muted   { background: var(--code-bg); color: var(--muted); }
.badge-l0 { background: var(--accent-light); color: var(--accent); }
.badge-l1 { background: color-mix(in srgb, var(--warning) 14%, transparent); color: var(--warning); }
.badge-l2 { background: color-mix(in srgb, var(--success) 14%, transparent); color: var(--success); }
.badge-l3 { background: color-mix(in srgb, var(--secondary) 14%, transparent); color: var(--secondary); }

/* --- Code Blocks --- */
code, .mono { font-family: var(--font-mono); font-size: .88em; }
pre {
  background: var(--code-bg); padding: 1rem; border-radius: var(--radius-sm);
  overflow-x: auto; font-size: .9rem; line-height: 1.8;
  border: 1px solid var(--border);
}
pre code { background: none; padding: 0; font-size: inherit; }
code:not(pre code) {
  background: var(--code-bg); padding: .1rem .35rem; border-radius: 3px;
  border: 1px solid color-mix(in srgb, var(--border) 50%, transparent);
}

/* --- Footer --- */
footer {
  padding: 2rem 0; text-align: center; color: var(--muted); font-size: .85rem;
  border-top: 1px solid var(--border);
}
footer a { color: var(--accent); text-decoration: none; }
footer a:hover { text-decoration: underline; }

/* --- Utility Classes --- */
.text-muted  { color: var(--muted); }
.text-accent { color: var(--accent); }
.mono        { font-family: var(--font-mono); }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* --- Animations --- */
@keyframes fadeIn { from { opacity: 0 } to { opacity: 1 } }
@keyframes slideUp {
  from { opacity: 0; transform: translateY(16px) }
  to   { opacity: 1; transform: translateY(0) }
}
@keyframes scanLine {
  0%   { opacity: 1 }
  4%   { opacity: .6 }
  8%   { opacity: 1 }
  12%  { opacity: .85 }
  16%  { opacity: 1 }
  100% { opacity: 1 }
}
.fade-in  { animation: fadeIn .4s ease both; }
.slide-up { animation: slideUp .5s ease both; }
.scan-flicker { animation: scanLine .8s ease-out both; }

/* --- Responsive --- */
@media (max-width: 1024px) {
  .site-nav .nav-links a { padding: .4rem .5rem; font-size: .82rem; }
}
@media (max-width: 640px) {
  :root { --nav-height: 56px; }
  .container { padding: 0 1rem; }
  header h1 { font-size: 1.8rem; }
  .cards { grid-template-columns: 1fr; }
  .metrics { grid-template-columns: repeat(2, 1fr); }
  table { font-size: .8rem; }
  th, td { padding: .4rem .3rem; }
  .site-nav .nav-links { display: none; }
  .nav-hamburger { display: flex; align-items: center; justify-content: center; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}