/* ==============================================================================
   ML Housing Knowledge Portal — Master Editorial Design System (Zai Theme Default)
   Zero External CDN Dependencies · 100% Local & Offline-Ready
   ============================================================================== */

@import url('fontawesome.min.css');
@import url('fonts.css');

/* CSS Variables / Theme Tokens */
:root {
  --paper: #F2EDE0;
  --paper-2: #E8E1D0;
  --paper-card: #FAF7F0;
  --ink: #1A1714;
  --ink-soft: #4A4239;
  --ink-faint: #7C7469;
  --rust: #C2410C;
  --rust-deep: #9A2F08;
  --rust-glow: rgba(194, 65, 12, 0.15);
  --moss: #3F5E3F;
  --moss-glow: rgba(63, 94, 63, 0.15);
  --slate: #1E293B;
  --slate-2: #0F172A;
  --line: #D8CFB8;
  --line-dark: #C4BA9F;
  --font-display: 'Fraunces', Georgia, 'Times New Roman', serif;
  --font-body: 'Space Grotesk', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;
}

/* Dark Mode Overrides */
html.dark-theme {
  --paper: #090D15;
  --paper-2: #101622;
  --paper-card: #151D2C;
  --ink: #F3F0E6;
  --ink-soft: #A8A29E;
  --ink-faint: #64748B;
  --rust: #F97316;
  --rust-deep: #EA580C;
  --rust-glow: rgba(249, 115, 22, 0.25);
  --moss: #34D399;
  --moss-glow: rgba(52, 211, 153, 0.2);
  --slate: #0A0E17;
  --slate-2: #04060A;
  --line: #222D3E;
  --line-dark: #1A2433;
}

/* Reset & Base */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  background-color: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color 0.25s ease, color 0.25s ease;
}

/* Grain Overlay (from html_zai.html) */
.grain {
  background-image:
    radial-gradient(circle at 25% 30%, rgba(194,65,12,0.04) 0%, transparent 40%),
    radial-gradient(circle at 75% 70%, rgba(63,94,63,0.04) 0%, transparent 40%),
    url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='200' height='200'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0.1 0 0 0 0 0.09 0 0 0 0 0.08 0 0 0 0.12 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
}

/* Typography Utility Classes */
.font-display { font-family: var(--font-display); font-optical-sizing: auto; }
.font-mono { font-family: var(--font-mono); }
.font-body { font-family: var(--font-body); }

/* Editorial Rules / Borders */
.rule { border-top: 1px solid var(--line); }
.rule-ink { border-top: 1px solid var(--ink); }
.rule-thick { border-top: 2px solid var(--ink); }

/* Editorial Chips */
.chip {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  padding: 3px 8px;
  border-radius: 4px;
  background: var(--ink);
  color: var(--paper);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-weight: 500;
  text-transform: uppercase;
}
.chip-rust { background: var(--rust); color: #fff; }
.chip-moss { background: var(--moss); color: #fff; }
.chip-soft { background: transparent; color: var(--ink); border: 1px solid var(--ink); }
.chip-outline { background: var(--paper-2); color: var(--ink-soft); border: 1px solid var(--line); }

/* Numbered Circle Badges */
.num-circle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 15px;
  flex-shrink: 0;
}
.num-circle.rust { background: var(--rust); color: #fff; }
.num-circle.moss { background: var(--moss); color: #fff; }

/* Editorial Cards */
.editorial-card {
  background: var(--paper-card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04), 0 8px 24px rgba(0,0,0,0.04);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}
.editorial-card:hover {
  border-color: var(--line-dark);
  box-shadow: 0 4px 8px rgba(0,0,0,0.05), 0 16px 36px rgba(0,0,0,0.06);
}

/* Code Blocks & Syntax Tokens */
.code-card {
  background: var(--slate-2);
  color: #E2E8F0;
  border-radius: 10px;
  border: 1px solid #2D3748;
  overflow: hidden;
  margin: 1.25rem 0;
  box-shadow: 0 6px 20px rgba(0,0,0,0.25);
}
.code-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 1rem;
  background: #141C2B;
  border-bottom: 1px solid #2D3748;
  font-family: var(--font-mono);
  font-size: 12px;
}
.code-lang-label {
  color: var(--rust);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
}
.code-copy-btn {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15);
  color: #CBD5E1;
  padding: 3px 10px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  transition: all 0.2s;
}
.code-copy-btn:hover {
  background: var(--rust);
  color: #FFFFFF;
  border-color: var(--rust);
}
.code-pre {
  padding: 1.25rem;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  overflow-x: auto;
  color: #E2E8F0;
}

/* Syntax Token Colors (from html_zai.html) */
.tk-tag { color: #F472B6; }
.tk-attr { color: #A5B4FC; }
.tk-str { color: #FCD34D; }
.tk-com { color: #64748B; font-style: italic; }
.tk-cls { color: #5EEAD4; }
.tk-fn { color: #60A5FA; }
.tk-num { color: #F87171; }
.tk-kw { color: #C084FC; font-weight: 600; }

/* Box Model Visualizers */
.box-pad {
  background: repeating-linear-gradient(45deg,
    rgba(194,65,12,0.12) 0, rgba(194,65,12,0.12) 6px,
    rgba(194,65,12,0.04) 6px, rgba(194,65,12,0.04) 12px);
  border: 1px dashed var(--rust);
}
.box-mar {
  background: repeating-linear-gradient(45deg,
    rgba(63,94,63,0.12) 0, rgba(63,94,63,0.12) 6px,
    rgba(63,94,63,0.04) 6px, rgba(63,94,63,0.04) 12px);
  border: 1px dashed var(--moss);
}

/* Perspective Switcher Tabs (Unified Multi-Perspective Inspector) */
.perspective-tab-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem;
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: 8px;
  margin-bottom: 1rem;
  overflow-x: auto;
}
.perspective-tab-btn {
  padding: 0.4rem 0.85rem;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--ink-soft);
  background: transparent;
  border: 0;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
  white-space: nowrap;
}
.perspective-tab-btn:hover {
  color: var(--ink);
  background: rgba(0,0,0,0.04);
}
.perspective-tab-btn.active {
  background: var(--ink);
  color: var(--paper);
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}

/* Reading Progress Bar */
#topProgressBar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: var(--rust);
  width: 0%;
  z-index: 100;
  transition: width 0.1s ease-out;
}

/* Theme Customizer Floating Drawer */
#themeCustomizerPanel {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 340px;
  max-width: 90vw;
  background: var(--paper);
  border-left: 2px solid var(--ink);
  box-shadow: -10px 0 40px rgba(0,0,0,0.25);
  z-index: 99;
  transform: translateX(100%);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
}
#themeCustomizerPanel.open {
  transform: translateX(0);
}

/* Palette Swatches */
.palette-preset-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 8px 12px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--paper-2);
  color: var(--ink);
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  transition: all 0.2s;
  text-align: left;
}
.palette-preset-btn:hover {
  border-color: var(--ink);
  transform: translateX(3px);
}
.swatch-dots {
  display: flex;
  gap: 4px;
}
.swatch-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 1px solid rgba(0,0,0,0.15);
}

/* Color Picker Inputs */
.color-picker-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 0;
  border-bottom: 1px solid var(--line);
  font-size: 13px;
}
.color-picker-input {
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  width: 34px;
  height: 34px;
  background: transparent;
  border: 2px solid var(--line);
  border-radius: 6px;
  cursor: pointer;
  padding: 2px;
}
.color-picker-input::-webkit-color-swatch {
  border-radius: 4px;
  border: none;
}

/* Tables in Editorial Style */
.editorial-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  margin: 1.25rem 0;
}
.editorial-table th {
  text-align: left;
  padding: 10px 14px;
  border-bottom: 2px solid var(--ink);
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--ink);
}
.editorial-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
  color: var(--ink-soft);
}
.editorial-table tr:hover td {
  background: var(--paper-2);
}

/* Interactive Math / Simulator Widgets */
.sim-card {
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1.5rem;
  margin: 1.5rem 0;
}
.sim-slider {
  width: 100%;
  accent-color: var(--rust);
  cursor: pointer;
}

/* Toast */
#editorialToast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 10px 18px;
  border-radius: 6px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.25);
  display: flex;
  align-items: center;
  gap: 8px;
  z-index: 110;
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  pointer-events: none;
}
#editorialToast.show {
  transform: translateY(0);
  opacity: 1;
}

/* Responsive Container */
.site-container {
  width: 100%;
  max-width: 1320px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}