/* ==========================================================================
   WEIGHT CONVERTER - MASTER DESIGN SYSTEM
   Ultra-Clean, Modern Glassmorphism, Micro-Animations, Light/Dark Modes
   ========================================================================== */

:root {
  /* Typography */
  --font-heading: 'Outfit', 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Color Palette - Light Mode (Dark Brown, Brown & Cream) */
  --bg-primary: #F8F4EE;           /* Warm silk cream background */
  --bg-secondary: #FFFFFF;         /* Crisp porcelain white card surface */
  --bg-tertiary: #EFE7DB;          /* Soft warm latte / biscuit sub-container */
  --bg-card: rgba(255, 253, 248, 0.94);
  --bg-card-hover: rgba(255, 255, 255, 0.99);
  --bg-glass: rgba(248, 244, 238, 0.88);
  
  --text-primary: #2C1810;         /* Deep dark espresso brown */
  --text-secondary: #5E3825;       /* Warm roasted mocha brown */
  --text-muted: #94715A;           /* Muted sand brown */
  --text-accent: #B45309;          /* Warm golden caramel */
  --text-inverse: #F8F4EE;

  --border-subtle: #E2D5C3;         /* Warm cream-latte border */
  --border-strong: #CDBC9F;
  --border-focus: #78350F;          /* Rich chestnut brown focus */
  --border-glow: rgba(120, 53, 15, 0.25);

  /* Primary Brand & Accents (Dark Brown to Caramel Bronze) */
  --primary: #6E3211;              /* Rich Coffee Brown / Chestnut */
  --primary-hover: #8D4118;        /* Warm Caramel Brown */
  --primary-light: #F4ECE1;        /* Soft cream pill badge */
  --primary-gradient: linear-gradient(135deg, #4A1D08 0%, #7C3A16 50%, #B45309 100%);
  --accent-brown: #78350F;
  --accent-amber: #B45309;         /* Warm Amber Caramel */
  --accent-gold: linear-gradient(135deg, #78350F 0%, #B45309 50%, #D97706 100%);
  --accent-purple: linear-gradient(135deg, #4A1D08 0%, #78350F 100%);
  --accent-emerald-grad: linear-gradient(135deg, #2D5A27 0%, #4D7C0F 100%);

  /* Shadows */
  --shadow-sm: 0 1px 3px 0 rgba(44, 24, 16, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(44, 24, 16, 0.07), 0 2px 4px -2px rgba(44, 24, 16, 0.04);
  --shadow-lg: 0 10px 20px -3px rgba(44, 24, 16, 0.09), 0 4px 6px -4px rgba(44, 24, 16, 0.04);
  --shadow-xl: 0 20px 30px -5px rgba(44, 24, 16, 0.12), 0 8px 10px -6px rgba(44, 24, 16, 0.05);
  --shadow-glow: 0 0 25px rgba(110, 50, 17, 0.22);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

[data-theme="dark"] {
  /* Color Palette - Dark Mode (Velvet Dark Brown Obsidian & Glowing Caramel) */
  --bg-primary: #120A06;           /* Deep dark roast espresso obsidian */
  --bg-secondary: #1C100B;         /* Velvet dark brown container */
  --bg-tertiary: #291811;          /* Rich mocha brown sub-container */
  --bg-card: rgba(28, 16, 11, 0.86);
  --bg-card-hover: rgba(41, 24, 17, 0.94);
  --bg-glass: rgba(18, 10, 6, 0.82);

  --text-primary: #FDF8F0;         /* Luminous warm cream-white */
  --text-secondary: #F3DECA;       /* Soft vanilla cream */
  --text-muted: #A8866E;           /* Warm toasted almond */
  --text-accent: #F59E0B;          /* Bright glowing amber */
  --text-inverse: #120A06;

  --border-subtle: rgba(217, 119, 6, 0.16);
  --border-strong: rgba(217, 119, 6, 0.28);
  --border-focus: #D97706;
  --border-glow: rgba(217, 119, 6, 0.38);

  --primary: #D97706;              /* Glowing Golden Caramel */
  --primary-hover: #F59E0B;
  --primary-light: rgba(217, 119, 6, 0.18);
  --primary-gradient: linear-gradient(135deg, #78350F 0%, #D97706 60%, #FBBF24 100%);

  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.5);
  --shadow-md: 0 4px 8px -1px rgba(0, 0, 0, 0.6);
  --shadow-lg: 0 12px 24px -3px rgba(0, 0, 0, 0.7);
  --shadow-xl: 0 24px 36px -5px rgba(0, 0, 0, 0.8);
  --shadow-glow: 0 0 35px rgba(217, 119, 6, 0.35);
}

/* ==========================================================================
   BASE & RESET
   ========================================================================== */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-sans);
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  overflow-x: hidden;
  max-width: 100vw;
  width: 100%;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  letter-spacing: -0.025em;
}

body {
  background-color: var(--bg-primary);
  background-image: 
    radial-gradient(circle at 50% -20%, rgba(217, 119, 6, 0.12) 0%, transparent 55%),
    radial-gradient(rgba(110, 50, 17, 0.055) 1.2px, transparent 1.2px);
  background-size: 100% 100%, 28px 28px;
  background-attachment: fixed;
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  max-width: 100vw;
  width: 100%;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

[data-theme="dark"] body {
  background-color: var(--bg-primary);
  background-image: 
    radial-gradient(circle at 50% -20%, rgba(217, 119, 6, 0.18) 0%, transparent 60%),
    radial-gradient(rgba(217, 119, 6, 0.09) 1.2px, transparent 1.2px);
  background-size: 100% 100%, 28px 28px;
}

img, svg, video, canvas, audio, iframe, embed, object {
  max-width: 100%;
  height: auto;
}

/* Ambient Lighting Orbs - Espresso & Warm Amber Caramel */
.bg-ambient-orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(140px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.38;
  max-width: 100vw;
  overflow: hidden;
  animation: floatOrb 22s infinite alternate ease-in-out;
}
.bg-orb-1 {
  width: 540px;
  height: 540px;
  background: radial-gradient(circle, #4A1D08, transparent 70%);
  top: -160px;
  left: -100px;
}
.bg-orb-2 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, #B45309, transparent 70%);
  bottom: 10%;
  right: -100px;
  animation-delay: -6s;
}
.bg-orb-3 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, #D97706, transparent 70%);
  top: 45%;
  left: 50%;
  transform: translate(-50%, -50%);
  opacity: 0.16;
}

@keyframes floatOrb {
  0% { transform: translateY(0px) scale(1); }
  50% { transform: translateY(35px) scale(1.06); }
  100% { transform: translateY(-25px) scale(0.96); }
}

/* Live Status Dot Indicator */
.live-status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #10B981;
  display: inline-block;
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  animation: livePulse 2s infinite cubic-bezier(0.4, 0, 0.6, 1);
  margin-right: 0.35rem;
}

@keyframes livePulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1.15); box-shadow: 0 0 0 7px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.container {
  max-width: 1240px;
  width: 100%;
  margin: 0 auto;
  padding: 0 1.5rem;
  position: relative;
  z-index: 1;
  box-sizing: border-box;
}

/* Contextual Linking Architecture (SEO & Internal Mesh) */
.contextual-link, .prose a, .content-text a {
  color: var(--primary);
  font-weight: 600;
  text-decoration: underline;
  text-decoration-thickness: 1.5px;
  text-underline-offset: 3px;
  transition: color var(--transition-fast), text-decoration-color var(--transition-fast);
}
.contextual-link:hover, .prose a:hover, .content-text a:hover {
  color: var(--primary-dark);
  text-decoration-color: var(--primary-dark);
}
.contextual-card-box {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-top: 2rem;
  box-shadow: var(--shadow-sm);
}
.contextual-card-box h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.85rem;
}
.contextual-card-box p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.75;
  margin-bottom: 1.2rem;
}
.contextual-tags-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}
.contextual-tag-item {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 0.95rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
  text-decoration: none;
  transition: all var(--transition-fast);
}
.contextual-tag-item:hover {
  border-color: var(--primary);
  background: var(--bg-surface-hover);
  color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

/* ==========================================================================
   NAVBAR & HEADER
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: all var(--transition-normal);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 800;
  font-size: 1.28rem;
  letter-spacing: -0.02em;
}

.logo-icon-wrapper {
  width: 42px;
  height: 42px;
  background: var(--primary-gradient);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(110, 50, 17, 0.35);
  transition: transform var(--transition-bounce);
}

.brand-logo:hover .logo-icon-wrapper {
  transform: rotate(-6deg) scale(1.08);
}

.gradient-text {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  list-style: none;
}

.nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.92rem;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.nav-link:hover, .nav-link.active {
  color: var(--primary);
  background: var(--primary-light);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.theme-toggle-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-bounce);
  flex-shrink: 0;
}

.theme-toggle-btn:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
}

.mobile-menu-btn {
  display: none;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-bounce);
  flex-shrink: 0;
}

.mobile-menu-btn:hover {
  border-color: var(--border-strong);
  background: var(--bg-tertiary);
}

/* Mobile Nav Drawer & Backdrop */
.mobile-nav-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(18, 10, 6, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 200;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.mobile-nav-backdrop.active {
  opacity: 1;
  pointer-events: auto;
}

.mobile-nav-drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(85vw, 340px);
  background: var(--bg-secondary);
  border-left: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-xl);
  z-index: 210;
  transform: translateX(100%);
  transition: transform 0.35s cubic-bezier(0.34, 1.2, 0.64, 1);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  padding: 1.25rem 1.25rem 2rem;
}

.mobile-nav-drawer.active {
  transform: translateX(0);
}

.mobile-nav-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 1.25rem;
}

.mobile-nav-close-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  line-height: 1;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.mobile-nav-close-btn:hover {
  background: var(--primary-light);
  color: var(--primary);
}

.mobile-nav-section-title {
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin: 1rem 0 0.5rem;
}

.mobile-nav-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.mobile-nav-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.65rem 0.85rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.92rem;
  background: transparent;
  transition: all var(--transition-fast);
}

.mobile-nav-link:hover, .mobile-nav-link.active {
  background: var(--primary-light);
  color: var(--primary);
}

.mobile-nav-link-left {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.mobile-nav-badge {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-full);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
}

/* ==========================================================================
   HERO & UNIVERSAL LIVE CONVERTER
   ========================================================================== */

.hero-section {
  padding: 3rem 0 2rem;
  text-align: center;
}

.hero-brand-emblem {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  padding: 0.35rem 1.15rem 0.35rem 0.45rem;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-sm);
  margin-bottom: 1.25rem;
  transition: all var(--transition-fast);
}

.hero-brand-emblem:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
}

.hero-mini-logo {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--primary-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(110, 50, 17, 0.35);
}

.hero-emblem-tag {
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--primary);
}

.hero-title {
  font-size: clamp(2.2rem, 4.5vw, 3.4rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 2.5rem;
  line-height: 1.6;
}

/* Hero Feature Badges */
.hero-features-strip {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
  margin-bottom: 2.5rem;
}

.hero-feature-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  padding: 0.35rem 0.85rem;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-secondary);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: all var(--transition-fast);
}

.hero-feature-pill svg {
  color: var(--primary);
  flex-shrink: 0;
}

.hero-feature-pill:hover {
  transform: translateY(-2px);
  border-color: var(--primary);
  color: var(--primary);
  box-shadow: var(--shadow-md);
}

/* Converter Card */
.converter-container {
  max-width: 860px;
  margin: 0 auto 2.5rem;
}

.converter-glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem 1.85rem;
  box-shadow: 0 25px 60px -15px rgba(44, 24, 16, 0.12), 0 0 0 1px rgba(255, 255, 255, 0.6) inset;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.converter-glass-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, #6E3211, #D97706, #F59E0B, #B45309, #6E3211);
  background-size: 200% 100%;
  animation: shimmerBorder 6s linear infinite;
}

@keyframes shimmerBorder {
  0% { background-position: 0% 0%; }
  100% { background-position: 200% 0%; }
}

[data-theme="dark"] .converter-glass-card {
  box-shadow: 0 25px 65px -15px rgba(0, 0, 0, 0.75), 0 0 0 1px rgba(217, 119, 6, 0.22) inset, var(--shadow-glow);
}

/* Silo Tabs Header (Pill Bar) */
.silo-tabs-wrapper {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  overflow-x: auto;
  padding: 0.35rem;
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  margin-bottom: 1.25rem;
  border: 1px solid var(--border-subtle);
  scrollbar-width: none;
}
.silo-tabs-wrapper::-webkit-scrollbar {
  display: none;
}

.silo-tab {
  background: transparent;
  border: none;
  padding: 0.5rem 0.9rem;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.45rem;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.silo-tab:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.5);
}
[data-theme="dark"] .silo-tab:hover {
  background: rgba(255, 255, 255, 0.08);
}

.silo-tab.active {
  background: var(--bg-secondary);
  color: var(--primary);
  font-weight: 700;
  box-shadow: var(--shadow-sm);
}
[data-theme="dark"] .silo-tab.active {
  background: var(--primary-gradient);
  color: #FFFFFF;
  box-shadow: 0 4px 12px rgba(217, 119, 6, 0.35);
}

/* Main Inputs Layout */
.converter-inputs-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.input-group-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.95rem 1.15rem;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
  position: relative;
}

.input-group-card:hover {
  border-color: var(--border-strong);
}

.input-group-card:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(110, 50, 17, 0.12), var(--shadow-md);
}

[data-theme="dark"] .input-group-card:focus-within {
  box-shadow: 0 0 0 3px rgba(217, 119, 6, 0.22), var(--shadow-md);
}

.input-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.input-label-with-icon {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.input-mini-logo {
  font-size: 1rem;
  line-height: 1;
}

.input-label {
  font-size: 0.74rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
}

.input-header-actions {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.input-stepper-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  width: 26px;
  height: 26px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
  line-height: 1;
}

.input-stepper-btn:hover {
  background: var(--primary-light);
  color: var(--primary);
  border-color: var(--primary);
}

.input-inline-copy-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  height: 26px;
  padding: 0 0.55rem;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.input-inline-copy-btn:hover {
  background: var(--primary-light);
  color: var(--primary);
  border-color: var(--primary);
}

.input-inline-copy-btn.copied {
  background: #10B981 !important;
  color: #FFFFFF !important;
  border-color: #10B981 !important;
}

.unit-select {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  font-weight: 700;
  font-size: 0.86rem;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  outline: none;
  transition: border-color var(--transition-fast);
}

.unit-select:hover, .unit-select:focus {
  border-color: var(--primary);
}

.input-field-wrapper {
  position: relative;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
}

.weight-input {
  width: 100%;
  background: transparent;
  border: none;
  font-family: var(--font-mono);
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--text-primary);
  outline: none;
  padding: 0.15rem 0;
  letter-spacing: -0.02em;
}

.unit-symbol-tag {
  font-size: 1rem;
  font-weight: 700;
  color: var(--primary);
  margin-left: 0.5rem;
  user-select: none;
  background: var(--bg-tertiary);
  padding: 0.15rem 0.55rem;
  border-radius: 6px;
  font-family: var(--font-mono);
}

/* Swap Button */
.swap-action-wrapper {
  display: flex;
  justify-content: center;
}

.swap-btn {
  width: 54px;
  height: 54px;
  border-radius: 50%;
  background: var(--bg-secondary);
  border: 2px solid var(--border-subtle);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-md), 0 0 15px rgba(110, 50, 17, 0.08);
  transition: all var(--transition-bounce);
  position: relative;
  z-index: 2;
}

.swap-btn:hover {
  transform: rotate(180deg) scale(1.12);
  background: var(--primary-gradient);
  color: #ffffff;
  border-color: transparent;
  box-shadow: 0 8px 24px rgba(110, 50, 17, 0.35);
}

.swap-btn.is-spinning {
  animation: swapSpin 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes swapSpin {
  0% { transform: rotate(0deg) scale(1); }
  50% { transform: rotate(180deg) scale(1.18); }
  100% { transform: rotate(360deg) scale(1); }
}

/* Presets Bar */
.presets-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-bottom: 1.5rem;
}

.preset-title {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-right: 0.25rem;
}

.preset-chip {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.80rem;
  font-weight: 600;
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.preset-chip:hover {
  background: var(--primary-light);
  color: var(--primary);
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.preset-chip.active {
  background: var(--primary);
  color: #FFFFFF;
  border-color: var(--primary);
}

/* Precision Controls Bar */
.converter-controls-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-subtle);
}

.precision-selector-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.control-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.precision-btn-group {
  display: flex;
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  padding: 2px;
}

.prec-btn {
  background: transparent;
  border: none;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-secondary);
  padding: 0.3rem 0.6rem;
  border-radius: 6px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.prec-btn.active {
  background: var(--bg-secondary);
  color: var(--primary);
  box-shadow: var(--shadow-sm);
}

.action-tools-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.tool-action-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transition: all var(--transition-fast);
}

.tool-action-btn:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border-color: var(--border-strong);
}

.tool-action-btn.btn-primary-action {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
}
.tool-action-btn.btn-primary-action:hover {
  background: var(--primary-hover);
}

/* Formula & Perspective Card */
.breakdown-card {
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-top: 1.5rem;
  border-left: 4px solid var(--primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.breakdown-formula {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.formula-title {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.formula-math {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
}

.formula-highlight {
  color: var(--primary);
  font-weight: 700;
}

.perspective-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-secondary);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
}

/* Balance Scale Animation Visualizer */
.balance-scale-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 2rem 0 0;
  padding: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
}

.scale-svg-wrapper {
  width: 100%;
  max-width: 480px;
  height: 120px;
}

.scale-beam {
  transform-origin: 240px 40px;
  transition: transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.scale-caption {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 600;
  margin-top: 0.5rem;
}

/* ==========================================================================
   LIVE MULTI-UNIT CONVERSION MATRIX
   ========================================================================== */

.section-block {
  margin: 4rem 0;
}

.section-header-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 1.75rem;
}

.section-badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--primary);
  box-shadow: var(--shadow-sm);
  margin-bottom: 0.65rem;
}

.badge-mini-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
}

.section-title {
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.section-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
}

.live-matrix-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  gap: 0.85rem;
}

.matrix-unit-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-bounce);
  position: relative;
}

.matrix-unit-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-strong);
}

.matrix-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.45rem;
}

.matrix-unit-header {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.matrix-unit-mini-icon {
  font-size: 1rem;
  line-height: 1;
}

.matrix-unit-name {
  font-weight: 700;
  font-size: 0.88rem;
  color: var(--text-primary);
}

.matrix-category-tag {
  font-size: 0.68rem;
  font-weight: 700;
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-full);
  text-transform: uppercase;
}

.tag-metric { background: #F5ECE2; color: #6E3211; }
.tag-imperial { background: #FEF3C7; color: #78350F; }
.tag-precious { background: #FFFBEB; color: #92400E; }
.tag-culinary { background: #FFEDD5; color: #9A3412; }
.tag-scientific { background: #EFE7DB; color: #4A1D08; }

[data-theme="dark"] .tag-metric { background: rgba(217, 119, 6, 0.2); color: #FDE68A; }
[data-theme="dark"] .tag-imperial { background: rgba(180, 83, 9, 0.2); color: #FCD34D; }
[data-theme="dark"] .tag-precious { background: rgba(245, 158, 11, 0.2); color: #FDE047; }
[data-theme="dark"] .tag-culinary { background: rgba(234, 88, 12, 0.2); color: #FDBA74; }
[data-theme="dark"] .tag-scientific { background: rgba(120, 53, 15, 0.25); color: #F5D0B5; }

.matrix-card-val {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  word-break: break-all;
}

.matrix-card-copy-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  transition: color var(--transition-fast);
}

.matrix-card-copy-btn:hover {
  color: var(--primary);
}

/* Synchronized Unit Matrix Table & Filter */
.matrix-filter-wrapper {
  position: relative;
  max-width: 440px;
  margin-bottom: 1.15rem;
}

.matrix-filter-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

.matrix-filter-input {
  width: 100%;
  padding: 0.6rem 1rem 0.6rem 2.4rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  color: var(--text-primary);
  outline: none;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}

.matrix-filter-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(110, 50, 17, 0.12), var(--shadow-sm);
}

.matrix-table-container {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  max-height: 560px;
  overflow-y: auto;
  overflow-x: auto;
  scrollbar-width: thin;
}

.matrix-table {
  width: 100%;
  border-collapse: collapse;
}

.matrix-table th {
  background: var(--bg-tertiary);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color: var(--text-secondary);
  font-weight: 700;
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.85rem 1rem;
  position: sticky;
  top: 0;
  z-index: 5;
  border-bottom: 1px solid var(--border-subtle);
  white-space: nowrap;
}

.matrix-table td {
  padding: 0.75rem 1rem;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.88rem;
  vertical-align: middle;
  transition: background-color var(--transition-fast);
}

.matrix-table tbody tr {
  transition: background-color var(--transition-fast);
}

.matrix-table tbody tr:hover td {
  background: var(--bg-tertiary);
}

.matrix-table tbody tr:hover td:first-child {
  border-left: 3px solid var(--primary);
}

.matrix-row-selected td {
  background: var(--primary-light);
}

.matrix-current-badge {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-full);
  background: var(--primary);
  color: #ffffff;
}

.matrix-table-val {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--primary);
  font-size: 1.05rem;
  display: inline-flex;
  align-items: baseline;
}

.matrix-card-copy-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  cursor: pointer;
  padding: 5px 9px;
  border-radius: 6px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.matrix-card-copy-btn:hover {
  background: var(--primary-light);
  color: var(--primary);
  border-color: var(--primary);
}

.matrix-card-copy-btn.copied {
  background: #10B981 !important;
  color: #FFFFFF !important;
  border-color: #10B981 !important;
}

/* ==========================================================================
   NICHE SILO CALCULATOR CARDS (Balanced Modern Sizing)
   ========================================================================== */

.niche-tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.15rem;
  max-width: 1140px;
  margin: 0 auto;
}

.niche-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.25rem 1.15rem;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
  box-sizing: border-box;
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  position: relative;
}

.niche-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  opacity: 0.9;
  transition: height var(--transition-fast);
}

#tool-fitness::before { background: var(--accent-emerald-grad); }
#tool-metals::before { background: var(--accent-gold); }
#tool-culinary::before { background: var(--primary-gradient); }
#tool-freight::before { background: linear-gradient(135deg, #7C3A16 0%, #B45309 100%); }
#tool-science::before { background: var(--accent-purple); }

.niche-card:hover {
  transform: translateY(-3px);
  border-color: var(--primary);
  box-shadow: 0 10px 25px -4px rgba(110, 50, 17, 0.16), var(--shadow-md);
}

.niche-card:hover::before {
  height: 4px;
}

.niche-card-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.85rem;
}

.niche-card-icon {
  width: 38px;
  height: 38px;
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1rem;
  flex-shrink: 0;
}

.niche-card-icon svg {
  width: 20px;
  height: 20px;
}

.icon-bg-fitness { background: var(--accent-emerald); }
.icon-bg-metals { background: var(--accent-gold); }
.icon-bg-culinary { background: var(--accent-amber); }
.icon-bg-freight { background: var(--primary-gradient); }
.icon-bg-science { background: var(--accent-purple); }

.niche-card-title {
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.25;
}

.niche-card-desc {
  font-size: 0.80rem;
  color: var(--text-secondary);
  line-height: 1.25;
  margin-top: 0.15rem;
}

.niche-form-body {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  margin-top: 0.2rem;
  flex-grow: 1;
  width: 100%;
  box-sizing: border-box;
}

.niche-input-row {
  display: flex;
  gap: 0.6rem;
  width: 100%;
  box-sizing: border-box;
}

.niche-input-group {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  width: 100%;
  box-sizing: border-box;
}

.niche-input-group.flex-sm { flex: 0.9; }
.niche-input-group.flex-lg { flex: 1.1; }

.niche-label {
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  letter-spacing: 0.01em;
}

.niche-field {
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 7px;
  padding: 0.45rem 0.65rem;
  height: 36px;
  font-size: 0.88rem;
  color: var(--text-primary);
  outline: none;
  font-family: var(--font-mono);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

select.niche-field {
  font-family: var(--font-sans);
  font-size: 0.84rem;
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%236366f1' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.5rem center;
  background-size: 11px 11px;
  padding-right: 1.4rem;
  text-overflow: ellipsis;
  white-space: nowrap;
  overflow: hidden;
}

.niche-field:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.12);
}

.niche-result-box {
  background: var(--bg-tertiary);
  border-radius: 7px;
  padding: 0.55rem 0.85rem;
  margin-top: 0.35rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.35rem;
  box-sizing: border-box;
  width: 100%;
}

.niche-result-text {
  font-size: 0.74rem;
  color: var(--text-muted);
  font-weight: 600;
}

.niche-result-value {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--primary);
}

/* ==========================================================================
   DYNAMIC CONVERSION CHART GENERATOR & TABLES
   ========================================================================== */

.chart-generator-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  box-shadow: var(--shadow-md);
}

.chart-controls-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 0.75rem;
  margin-bottom: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-subtle);
}

.table-responsive {
  max-height: 400px;
  overflow-y: auto;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
}

.custom-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.custom-table th {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-weight: 700;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.65rem 1rem;
  position: sticky;
  top: 0;
  z-index: 2;
}

.custom-table td {
  padding: 0.55rem 1rem;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.88rem;
  color: var(--text-primary);
  font-family: var(--font-mono);
}

.custom-table tr:hover td {
  background: var(--bg-tertiary);
}

/* ==========================================================================
   COMPARISONS & EDUCATION
   ========================================================================== */

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

.compare-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.15rem 1.25rem;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  cursor: pointer;
  text-decoration: none;
  color: inherit;
}

.compare-card:hover {
  transform: translateY(-3px);
  border-color: var(--primary);
  box-shadow: 0 8px 20px -4px rgba(110, 50, 17, 0.2), var(--shadow-md);
}

.compare-badge {
  display: inline-block;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  margin-bottom: 0.75rem;
}

.compare-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.compare-body {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 1.25rem;
}

.compare-spec-row {
  display: flex;
  justify-content: space-between;
  padding: 0.4rem 0;
  border-top: 1px dashed var(--border-subtle);
  font-size: 0.85rem;
}

.compare-spec-label {
  color: var(--text-muted);
}
.compare-spec-value {
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--text-primary);
}

/* ==========================================================================
   GLOSSARY & SEARCHABLE ACCORDION
   ========================================================================== */

.glossary-search-wrapper {
  margin-bottom: 1.5rem;
  position: relative;
}

.glossary-search-input {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem 0.85rem 2.8rem;
  font-size: 1rem;
  color: var(--text-primary);
  outline: none;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}

.glossary-search-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(120, 53, 15, 0.15);
}

.glossary-search-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

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

.glossary-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.9rem 1.05rem;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 0.5rem;
  user-select: none;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

.glossary-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: transparent;
  transition: background var(--transition-fast);
}

.glossary-card:hover {
  border-color: var(--primary);
  transform: translateY(-3px);
  box-shadow: 0 10px 24px -6px rgba(110, 50, 17, 0.22), var(--shadow-sm);
  background: var(--bg-secondary);
}

.glossary-card:hover::before {
  background: var(--primary);
}

.glossary-card:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

.glossary-term {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.term-name-group {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.term-mini-icon {
  font-size: 1.1rem;
  line-height: 1;
}

.glossary-symbol {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--primary);
  background: var(--primary-light);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  letter-spacing: 0.02em;
}

.glossary-def {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.5;
  flex-grow: 1;
}

.glossary-def sup {
  font-size: 0.75em;
  line-height: 0;
}

.glossary-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.5rem;
  border-top: 1px dashed var(--border-subtle);
  font-size: 0.78rem;
}

.glossary-category-tag {
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-size: 0.72rem;
}

.glossary-action-hint {
  color: var(--primary);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  transition: transform var(--transition-fast);
}

.glossary-card:hover .glossary-action-hint {
  transform: translateX(3px);
}

/* Modal Styling Extensions */
.modal-card-lg {
  max-width: 620px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding: 1.75rem 2rem;
}

.glossary-modal-title-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.glossary-modal-badge {
  display: inline-block;
  align-self: flex-start;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--primary);
  background: var(--primary-light);
  padding: 0.2rem 0.6rem;
  border-radius: 20px;
}

.glossary-modal-title-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.glossary-modal-title {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 0;
}

.modal-body {
  overflow-y: auto;
  margin: 1.25rem -0.5rem 1.25rem 0;
  padding-right: 0.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.modal-body::-webkit-scrollbar {
  width: 5px;
}

.modal-body::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 4px;
}

.glossary-modal-section {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.glossary-section-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.glossary-modal-desc,
.glossary-modal-usage {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0;
}

.glossary-formula-box {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-left: 3px solid var(--primary);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
  word-break: break-word;
}

.glossary-equiv-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 0.5rem;
}

.glossary-equiv-item {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.75rem;
  font-size: 0.82rem;
  color: var(--text-primary);
}

.glossary-equiv-item strong {
  color: var(--primary);
  display: block;
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.15rem;
}

.modal-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.75rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-subtle);
}

/* ==========================================================================
   FAQ ACCORDION
   ========================================================================== */

.faq-container {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition-fast);
}

.faq-item.active {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-sm);
}

.faq-question {
  width: 100%;
  background: none;
  border: none;
  padding: 1.25rem 1.5rem;
  text-align: left;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.faq-icon {
  color: var(--primary);
  transition: transform var(--transition-bounce);
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease-out;
  padding: 0 1.5rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

.faq-item.active .faq-answer {
  max-height: 250px;
  padding-bottom: 1.25rem;
}

/* ==========================================================================
   GLOBAL SILO MATRIX DIRECTORY
   ========================================================================== */

.global-silo-section {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  padding: 4rem 0;
  margin-top: 5rem;
}

.silo-columns-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 2rem;
}

.silo-column-title {
  font-size: 0.95rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.silo-links-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.silo-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.88rem;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.silo-link:hover {
  color: var(--primary);
  transform: translateX(3px);
}

/* Footer */
.site-footer {
  padding: 2.5rem 0;
  background: var(--bg-primary);
  border-top: 1px solid var(--border-subtle);
}

.footer-content-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.footer-meta {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.footer-legal-links {
  display: flex;
  gap: 1.5rem;
}

.footer-legal-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.85rem;
  transition: color var(--transition-fast);
}

.footer-legal-link:hover {
  color: var(--primary);
}

/* Modals & Toasts */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(8px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
  padding: 1rem;
}

.modal-backdrop.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  max-width: 560px;
  width: 100%;
  padding: 2rem;
  box-shadow: var(--shadow-xl);
  transform: scale(0.95);
  transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.modal-backdrop.active .modal-card {
  transform: scale(1);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
}

.modal-close-btn {
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text-muted);
  cursor: pointer;
}


/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 1100;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  pointer-events: none;
}

.toast {
  background: var(--bg-secondary);
  border: 1px solid var(--border-strong);
  color: var(--text-primary);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.88rem;
  font-weight: 600;
  animation: slideInToast 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  pointer-events: auto;
}

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

/* ==========================================================================
   METROLOGY & CONTENT EXPANSION COMPONENTS
   ========================================================================== */

/* Trust Bar */
.trust-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 1.5rem;
  margin-top: 1.25rem;
  margin-bottom: 2.25rem;
  padding: 0.75rem 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.trust-bar-item {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.trust-bar-item svg {
  color: var(--primary);
  flex-shrink: 0;
}

/* Composite Stone Badge */
.composite-stone-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-top: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--primary);
  background: var(--primary-light);
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
}

/* Answer First Intro Snippet Box */
.answer-snippet-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-left: 5px solid var(--primary);
  border-radius: var(--radius-md);
  padding: 1.35rem 1.75rem;
  margin-bottom: 3rem;
  box-shadow: var(--shadow-sm);
  line-height: 1.7;
}

.answer-snippet-title {
  font-size: 0.85rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--primary);
  margin-bottom: 0.35rem;
}

.answer-snippet-text {
  font-size: 1.05rem;
  color: var(--text-primary);
  font-weight: 500;
}

/* Step-by-Step Usage Grid */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-bounce), border-color var(--transition-fast);
  position: relative;
}

.step-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
}

.step-number-badge {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--primary-gradient);
  color: #ffffff;
  font-weight: 800;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.85rem;
  box-shadow: 0 4px 10px rgba(110, 50, 17, 0.25);
}

.step-card-title {
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.4rem;
}

.step-card-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

.pro-tips-strip {
  margin-top: 1.5rem;
  padding: 1rem 1.35rem;
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Quick Reference Charts Grid */
.quick-charts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.75rem;
  margin-top: 1.5rem;
}

.quick-chart-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.quick-chart-card-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 1rem;
}

.quick-chart-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
}

.quick-chart-view-link {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--primary);
  text-decoration: none;
}

.quick-chart-view-link:hover {
  text-decoration: underline;
}

/* Worked Arithmetic Examples Grid */
.worked-examples-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-top: 1.75rem;
}

.worked-example-card {
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  padding: 1.35rem;
  border: 1px solid var(--border-subtle);
}

.worked-example-header {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.worked-example-math {
  font-family: var(--font-mono);
  font-size: 0.92rem;
  color: var(--primary);
  background: var(--bg-secondary);
  padding: 0.6rem 0.85rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  margin-bottom: 0.5rem;
}

.worked-example-desc {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* Unit Explainer System Cards */
.unit-explainer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.unit-explainer-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-bounce), border-color var(--transition-fast);
}

.unit-explainer-card:hover {
  transform: translateY(-3px);
  border-color: var(--primary);
}

.unit-explainer-header {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 1rem;
}

.unit-explainer-icon {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
}

.unit-explainer-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
}

.unit-explainer-units {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1rem;
}

.unit-pill-tag {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  padding: 0.2rem 0.55rem;
  border-radius: 6px;
  font-size: 0.78rem;
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--text-secondary);
}

.unit-explainer-hook {
  margin-top: 0.85rem;
  padding: 0.65rem 0.85rem;
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  color: var(--text-secondary);
  border-left: 3px solid var(--primary);
}

/* Physics Card (Weight vs Mass) */
.physics-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  margin-top: 1.5rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

.physics-compare-table {
  width: 100%;
  margin-top: 1.25rem;
  margin-bottom: 1.25rem;
  border-collapse: collapse;
}

.physics-compare-table th, .physics-compare-table td {
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-subtle);
  font-size: 0.9rem;
}

.physics-compare-table th {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-weight: 700;
}

/* Use Cases Domain Cards */
.use-cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.use-case-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.4rem;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-bounce), border-color var(--transition-fast);
}

.use-case-card:hover {
  transform: translateY(-3px);
  border-color: var(--primary);
}

.use-case-header {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 0.65rem;
}

.use-case-icon {
  font-size: 1.35rem;
}

.use-case-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
}

.use-case-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Mistakes Grid */
.mistakes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.mistake-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-left: 4px solid var(--text-accent);
  border-radius: var(--radius-md);
  padding: 1.4rem;
  box-shadow: var(--shadow-sm);
}

.mistake-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.4rem;
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.mistake-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* About Metrology Strip */
.about-metrology-strip {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  margin-top: 1.5rem;
  line-height: 1.7;
}


/* ==========================================================================
   RESPONSIVE DESIGN & MOBILE OPTIMIZATIONS
   Fixes all mobile gaps, unwanted horizontal overflow, padding, typography,
   niche cards, comparison tables, matrix grid, and touch targets
   ========================================================================== */

/* Universal Responsive Grids & Safe Widths */
.live-matrix-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 220px), 1fr));
  gap: 1.25rem;
}

.chart-controls-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 160px), 1fr));
  gap: 1rem;
}

.compare-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr));
  gap: 1.5rem;
}

.glossary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 260px), 1fr));
  gap: 1rem;
}

.silo-columns-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 150px), 1fr));
  gap: 1.5rem;
}

/* Base safe responsive tables */
.table-responsive {
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

/* Tablet & Smaller Screens (< 1024px) */
@media (max-width: 1024px) {
  .hero-title {
    font-size: clamp(2rem, 4vw, 3rem);
  }
  .nav-links {
    gap: 0.75rem;
  }
  .nav-link {
    font-size: 0.86rem;
    padding: 0.4rem 0.6rem;
  }
}

/* Tablet Portrait & Mobile Screens (< 860px) */
@media (max-width: 860px) {
  /* Header & Navigation */
  .site-header {
    height: 64px;
  }
  .nav-container {
    height: 64px;
  }
  .nav-links {
    display: none;
  }
  .mobile-menu-btn {
    display: inline-flex;
  }
  .brand-logo {
    font-size: 1.15rem;
    gap: 0.55rem;
  }
  .logo-icon-wrapper {
    width: 36px;
    height: 36px;
  }

  /* Main Container */
  .container {
    padding: 0 1rem;
  }

  /* Hero Section */
  .hero-section {
    padding: 2rem 0 1.25rem;
  }
  .hero-brand-emblem {
    margin-bottom: 1rem;
    padding: 0.25rem 0.9rem 0.25rem 0.35rem;
  }
  .hero-mini-logo {
    width: 26px;
    height: 26px;
  }
  .hero-emblem-tag {
    font-size: 0.75rem;
  }
  .hero-title {
    font-size: clamp(1.75rem, 6vw, 2.4rem);
    line-height: 1.2;
    margin-bottom: 0.75rem;
  }
  .hero-subtitle {
    font-size: 0.95rem;
    margin-bottom: 1.75rem;
    line-height: 1.5;
  }

  /* Universal Converter Card */
  .converter-container {
    margin: 0 auto 2rem;
  }
  .converter-glass-card {
    padding: 1.25rem 1rem;
    border-radius: var(--radius-md);
  }
  .converter-inputs-grid {
    grid-template-columns: 1fr;
    gap: 0.75rem;
    margin-bottom: 1.25rem;
  }
  .input-group-card {
    padding: 0.85rem 1rem;
  }
  .weight-input {
    font-size: clamp(1.6rem, 5vw, 2rem);
  }
  .swap-action-wrapper {
    margin: -0.25rem 0;
  }
  .swap-btn {
    width: 44px;
    height: 44px;
    transform: rotate(90deg);
  }
  .swap-btn:hover {
    transform: rotate(270deg) scale(1.08);
  }

  /* Silo Tabs Horizontal Touch Scrolling */
  .silo-tabs-wrapper {
    gap: 0.35rem;
    padding-bottom: 0.75rem;
    margin-bottom: 1.25rem;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  .silo-tabs-wrapper::-webkit-scrollbar {
    display: none;
  }
  .silo-tab {
    padding: 0.5rem 0.85rem;
    font-size: 0.82rem;
  }

  /* Quick Presets Bar */
  .presets-bar {
    gap: 0.35rem;
    margin-bottom: 1.25rem;
  }
  .preset-title {
    width: 100%;
    margin-bottom: 0.2rem;
    font-size: 0.75rem;
  }
  .preset-chip {
    padding: 0.28rem 0.65rem;
    font-size: 0.78rem;
  }

  /* Controls & Action Tools */
  .converter-controls-bar {
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
    padding-top: 0.85rem;
  }
  .precision-selector-group {
    justify-content: space-between;
    width: 100%;
  }
  .action-tools-group {
    width: 100%;
    justify-content: space-between;
  }
  .tool-action-btn {
    flex: 1;
    justify-content: center;
    padding: 0.5rem 0.6rem;
    font-size: 0.82rem;
  }

  /* Formula Breakdown Card */
  .breakdown-card {
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
    padding: 1rem;
    border-radius: var(--radius-sm);
  }
  .formula-math {
    font-size: 0.95rem;
    word-break: break-word;
  }
  .perspective-badge {
    width: 100%;
    justify-content: center;
    font-size: 0.8rem;
    text-align: center;
  }

  /* Balance Scale Visualizer */
  .balance-scale-container {
    padding: 1rem 0.75rem;
    margin: 1.5rem 0 0;
  }
  .scale-svg-wrapper {
    height: 85px;
  }

  /* Live Matrix Grid */
  .section-block {
    margin: 2.75rem 0;
  }
  .section-header-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.35rem;
    margin-bottom: 1.25rem;
  }
  .section-title {
    font-size: 1.35rem;
  }
  .section-desc {
    font-size: 0.88rem;
  }
  .live-matrix-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
  }
  .matrix-unit-card {
    padding: 0.85rem;
  }
  .matrix-unit-name {
    font-size: 0.85rem;
  }
  .matrix-category-tag {
    font-size: 0.65rem;
    padding: 0.15rem 0.4rem;
  }
  .matrix-card-val {
    font-size: 1.15rem;
  }

  /* Niche Silo Cards */
  .niche-tools-grid {
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1rem;
  }
  .niche-card {
    padding: 1rem 1.15rem;
    border-radius: var(--radius-md);
  }
  .niche-card-header {
    gap: 0.65rem;
    margin-bottom: 0.75rem;
  }
  .niche-card-icon {
    width: 34px;
    height: 34px;
    font-size: 0.95rem;
  }
  .niche-card-title {
    font-size: 0.98rem;
  }

  /* Chart Generator Card */
  .chart-generator-card {
    padding: 1.25rem 1rem;
    border-radius: var(--radius-md);
  }
  .chart-controls-grid {
    grid-template-columns: 1fr 1fr;
    gap: 0.65rem;
    margin-bottom: 1rem;
    padding-bottom: 1rem;
  }
  .custom-table th, .custom-table td {
    padding: 0.6rem 0.75rem;
    font-size: 0.82rem;
    white-space: nowrap;
  }

  /* Comparisons & Glossary */
  .compare-cards-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  .compare-card {
    padding: 1.25rem;
    border-radius: var(--radius-md);
  }
  .glossary-grid {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }
  .glossary-card {
    padding: 1rem;
  }

  /* Silo Directory & Footer */
  .global-silo-section {
    padding: 2.5rem 0;
    margin-top: 3rem;
  }
  .silo-columns-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
  }
  .footer-content-row {
    flex-direction: column;
    text-align: center;
    gap: 1rem;
    align-items: center;
  }
  .footer-legal-links {
    justify-content: center;
    flex-wrap: wrap;
    gap: 1rem;
  }

  /* Modals & Toasts */
  .modal-backdrop {
    padding: 0.75rem;
  }
  .modal-card, .modal-card-lg {
    max-width: 95vw;
    width: 95vw;
    padding: 1.25rem 1rem;
    max-height: 90vh;
    border-radius: var(--radius-md);
  }
  .glossary-modal-title {
    font-size: 1.2rem;
  }
  .glossary-equiv-grid {
    grid-template-columns: 1fr;
    gap: 0.4rem;
  }
  .toast-container {
    left: 1rem;
    right: 1rem;
    bottom: 1rem;
    align-items: center;
  }
  .toast {
    width: 100%;
    justify-content: center;
    text-align: center;
    font-size: 0.82rem;
    padding: 0.65rem 1rem;
  }
}

/* Smartphone Portrait & Narrow Screens (< 540px) */
@media (max-width: 540px) {
  /* Ambient Orbs - Keep light on mobile to prevent any overflow or lag */
  .bg-ambient-orb {
    opacity: 0.2;
    filter: blur(100px);
  }
  .bg-orb-1 {
    width: 280px;
    height: 280px;
    top: -80px;
    left: -60px;
  }
  .bg-orb-2 {
    width: 260px;
    height: 260px;
    right: -60px;
  }
  .bg-orb-3 {
    width: 200px;
    height: 200px;
  }

  /* Niche input stacking */
  .niche-input-row {
    flex-direction: column;
    gap: 0.5rem;
  }
  .niche-input-group.flex-sm,
  .niche-input-group.flex-lg {
    flex: 1;
    width: 100%;
  }
  .niche-result-box {
    padding: 0.5rem 0.75rem;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }
  .niche-result-value {
    font-size: 0.92rem;
  }

  /* Chart controls single column */
  .chart-controls-grid {
    grid-template-columns: 1fr;
  }

  /* Inline subpage grid overrides to prevent horizontal scroll gaps */
  div[style*="grid-template-columns"] {
    grid-template-columns: 1fr !important;
  }
}

/* Compact Smartphones (< 380px) */
@media (max-width: 380px) {
  .hero-title {
    font-size: 1.55rem;
  }
  .weight-input {
    font-size: 1.5rem;
  }
  .live-matrix-grid {
    grid-template-columns: 1fr;
  }
  .silo-columns-grid {
    grid-template-columns: 1fr;
  }
}

/* ==========================================================================
   NATIVE ACCESSIBLE FAQ ACCORDION (<details>/<summary>)
   ========================================================================== */
.faq-accordion-container {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin-top: 1.5rem;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

.faq-accordion-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0;
  transition: all var(--transition-normal);
  overflow: hidden;
}

.faq-accordion-item:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-sm);
}

.faq-accordion-item[open] {
  border-color: var(--primary);
  background: var(--bg-card);
  box-shadow: var(--shadow-md);
}

.faq-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.15rem 1.4rem;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-primary);
  cursor: pointer;
  list-style: none;
  user-select: none;
  transition: color var(--transition-fast);
}

.faq-summary::-webkit-details-marker {
  display: none;
}

.faq-question-text {
  flex: 1;
  text-align: left;
}

.faq-summary-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--bg-tertiary);
  color: var(--primary);
  flex-shrink: 0;
  transition: transform var(--transition-normal), background-color var(--transition-normal);
}

.faq-accordion-item[open] .faq-summary-icon {
  transform: rotate(180deg);
  background: var(--primary);
  color: #FFFFFF;
}

.faq-content {
  padding: 0 1.4rem 1.25rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  border-top: 1px solid var(--border-subtle);
  padding-top: 1rem;
}

.faq-content p {
  margin: 0;
}

/* ==========================================================================
   POPULAR WEIGHT CONVERSIONS (HUB GRID)
   ========================================================================== */
.hub-spokes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.15rem;
  margin-top: 1.5rem;
}

.hub-spoke-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.35rem 1.35rem 1.15rem;
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.hub-spoke-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
}

.hub-spoke-badge {
  display: inline-block;
  align-self: flex-start;
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  padding: 0.2rem 0.55rem;
  border-radius: 9999px;
  background: rgba(217, 119, 6, 0.12);
  color: var(--primary);
  border: 1px solid rgba(217, 119, 6, 0.25);
  margin-bottom: 0.75rem;
}

.hub-spoke-title {
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.45rem;
  line-height: 1.35;
}

.hub-spoke-desc {
  font-size: 0.86rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 1rem;
  flex: 1;
}

.hub-spoke-arrow {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.hub-spoke-card:hover .hub-spoke-arrow {
  text-decoration: underline;
}

/* Breadcrumb Navigation */
.breadcrumb-nav {
  margin: 1.25rem 0 1.5rem;
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 0.86rem;
}

.breadcrumb-item a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.breadcrumb-item a:hover {
  color: var(--primary);
}

.breadcrumb-item.active {
  color: var(--text-primary);
  font-weight: 600;
}

.breadcrumb-separator {
  color: var(--text-muted);
  opacity: 0.6;
}

/* ==========================================================================
   LIVE SYNCHRONIZED UNIT MATRIX DASHBOARD
   ========================================================================== */
#matrix {
  display: block !important;
  width: 100% !important;
  clear: both !important;
}

#matrix .container {
  display: flex !important;
  flex-direction: column !important;
  align-items: center !important;
  width: 100% !important;
}

.section-header-top {
  text-align: center;
  margin-bottom: 2.25rem;
  display: flex !important;
  flex-direction: column !important;
  align-items: center !important;
  justify-content: center !important;
  width: 100% !important;
}

.section-header-top .section-badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  margin: 0 auto 0.65rem auto;
}

.section-header-top .section-title {
  font-size: 2.1rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  margin-bottom: 0.45rem;
}

.section-header-top .section-desc {
  max-width: 680px;
  margin: 0 auto;
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.matrix-top-search-wrapper {
  width: 100%;
  max-width: 580px;
  margin: 1.25rem auto 0 auto;
}

.matrix-top-search-wrapper .matrix-search-box {
  width: 100%;
  padding: 0.65rem 1.25rem;
  background: var(--bg-card);
  border: 1.5px solid var(--border-subtle);
  border-radius: 9999px;
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: all var(--transition-fast);
}

.matrix-top-search-wrapper .matrix-search-box:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(217, 119, 6, 0.15), var(--shadow-md);
  background: var(--bg-card);
}

.matrix-top-search-wrapper .matrix-search-input {
  font-size: 0.95rem;
  width: 100%;
  border: none;
  background: transparent;
  outline: none;
  color: var(--text-primary);
}

.live-status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #10B981;
  box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.25);
  display: inline-block;
  animation: pulseLiveDot 2s infinite ease-in-out;
}

@keyframes pulseLiveDot {
  0%, 100% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.25);
    opacity: 0.65;
  }
}

.matrix-dashboard-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem 2.25rem;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
  transition: all var(--transition-normal);
  width: 100% !important;
  display: block !important;
  clear: both !important;
}

.matrix-dashboard-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary) 0%, var(--accent-amber) 50%, var(--primary) 100%);
  opacity: 0.9;
}

.matrix-top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-subtle);
}

.matrix-active-echo-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 1rem;
  background: rgba(217, 119, 6, 0.08);
  border: 1px solid rgba(217, 119, 6, 0.25);
  border-radius: 9999px;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.matrix-active-echo-pill strong {
  color: var(--primary);
  font-weight: 700;
}

.matrix-controls-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.75rem;
}

.matrix-filter-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.matrix-filter-btn {
  padding: 0.45rem 0.95rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: 9999px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.matrix-filter-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.matrix-filter-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #FFFFFF;
  box-shadow: 0 2px 8px rgba(217, 119, 6, 0.3);
}

.matrix-search-and-view {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.matrix-search-box {
  display: flex;
  align-items: center;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: 9999px;
  padding: 0.4rem 0.95rem;
  gap: 0.5rem;
  min-width: 250px;
  transition: all var(--transition-fast);
}

.matrix-search-box:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(217, 119, 6, 0.15);
  background: var(--bg-card);
}

.matrix-search-input {
  border: none;
  background: transparent;
  color: var(--text-primary);
  font-size: 0.85rem;
  width: 100%;
  outline: none;
}

.matrix-search-clear {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1.1rem;
  display: none;
  padding: 0;
  line-height: 1;
}

.matrix-view-toggle {
  display: inline-flex;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.18rem;
  gap: 0.2rem;
}

.matrix-view-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.7rem;
  background: transparent;
  border: none;
  border-radius: calc(var(--radius-sm) - 2px);
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.matrix-view-btn.active {
  background: var(--bg-card);
  color: var(--primary);
  box-shadow: var(--shadow-sm);
}

/* CARDS GRID VIEW */
.matrix-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1.15rem;
}

.matrix-unit-card {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.35rem;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
  position: relative;
}

.matrix-unit-card:hover {
  transform: translateY(-3px);
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
  background: var(--bg-card);
}

.matrix-unit-card.is-base-input {
  border-color: var(--primary);
  background: rgba(217, 119, 6, 0.05);
  box-shadow: 0 0 0 1.5px var(--primary);
}

.matrix-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.85rem;
}

.matrix-card-title-group {
  display: flex;
  align-items: center;
  gap: 0.55rem;
}

.matrix-card-icon {
  font-size: 1.25rem;
  line-height: 1;
}

.matrix-card-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
}

.matrix-system-tag {
  font-size: 0.68rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.2rem 0.55rem;
  border-radius: 9999px;
}

.tag-metric {
  background: rgba(59, 130, 246, 0.12);
  color: #3B82F6;
  border: 1px solid rgba(59, 130, 246, 0.25);
}

.tag-imperial {
  background: rgba(217, 119, 6, 0.12);
  color: var(--primary);
  border: 1px solid rgba(217, 119, 6, 0.25);
}

.tag-precious {
  background: rgba(168, 85, 247, 0.12);
  color: #A855F7;
  border: 1px solid rgba(168, 85, 247, 0.25);
}

.tag-scientific {
  background: rgba(16, 185, 129, 0.12);
  color: #10B981;
  border: 1px solid rgba(16, 185, 129, 0.25);
}

.matrix-card-value-box {
  margin-bottom: 0.85rem;
}

.matrix-card-val {
  font-family: var(--font-mono);
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  line-height: 1.25;
  word-break: break-all;
  font-variant-numeric: tabular-nums;
}

.matrix-card-symbol {
  font-size: 0.88rem;
  color: var(--primary);
  font-weight: 700;
  margin-left: 0.35rem;
}

.matrix-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: auto;
  padding-top: 0.85rem;
  border-top: 1px solid var(--border-subtle);
}

.matrix-card-desc {
  font-size: 0.76rem;
  color: var(--text-muted);
  line-height: 1.35;
  flex: 1;
  margin-right: 0.5rem;
}

.matrix-card-actions {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.matrix-icon-btn {
  width: 30px;
  height: 30px;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.matrix-icon-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--bg-tertiary);
}

.matrix-icon-btn.copied {
  background: #10B981;
  border-color: #10B981;
  color: #FFFFFF;
}

/* TABLE VIEW STYLING */
.matrix-table-wrapper {
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  overflow-x: auto;
  background: var(--bg-card);
}

.matrix-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.matrix-table th {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid var(--border-subtle);
}

.matrix-table td {
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid var(--border-subtle);
  font-size: 0.9rem;
  color: var(--text-primary);
}

.matrix-table tr:hover td {
  background: rgba(217, 119, 6, 0.03);
}

.matrix-table tr.matrix-row-selected td {
  background: rgba(217, 119, 6, 0.07);
}

.matrix-table-val {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}

.matrix-base-badge {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 800;
  padding: 0.15rem 0.5rem;
  border-radius: 9999px;
  background: var(--primary);
  color: #FFFFFF;
  margin-left: 0.4rem;
}

@media (max-width: 768px) {
  .matrix-dashboard-card {
    padding: 1.25rem 1rem;
  }
  .matrix-controls-row {
    flex-direction: column;
    align-items: stretch;
  }
  .matrix-search-box {
    width: 100%;
  }
  .matrix-search-and-view {
    width: 100%;
    justify-content: space-between;
  }
}