/* ============================================
   KB to GB Converter — Premium Design System
   Domain: kbtogb.com
   ============================================ */

/* ── Google Fonts ── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800;900&display=swap');

/* ── CSS Custom Properties ── */
:root {
  /* Colors */
  --bg-primary: #06060f;
  --bg-secondary: #0c0c1d;
  --bg-tertiary: #12122a;
  --bg-card: rgba(255, 255, 255, 0.03);
  --bg-card-hover: rgba(255, 255, 255, 0.06);
  --border-glass: rgba(255, 255, 255, 0.08);
  --border-glass-hover: rgba(255, 255, 255, 0.15);

  --text-primary: #f0f0f5;
  --text-secondary: rgba(240, 240, 245, 0.7);
  --text-tertiary: rgba(240, 240, 245, 0.45);
  --text-accent: #00d4ff;

  --accent-cyan: #00d4ff;
  --accent-cyan-dim: rgba(0, 212, 255, 0.15);
  --accent-cyan-glow: rgba(0, 212, 255, 0.3);
  --accent-gold: #f6d365;
  --accent-gold-end: #fda085;
  --accent-purple: #a855f7;
  --accent-purple-dim: rgba(168, 85, 247, 0.15);

  --gradient-hero: linear-gradient(135deg, #06060f 0%, #0f0a2e 40%, #1a0a3e 70%, #0a1628 100%);
  --gradient-accent: linear-gradient(135deg, #00d4ff, #3a7bd5);
  --gradient-gold: linear-gradient(135deg, #f6d365, #fda085);
  --gradient-card: linear-gradient(135deg, rgba(255,255,255,0.05), rgba(255,255,255,0.01));

  /* Spacing */
  --section-padding: 120px 0;
  --container-width: 1200px;
  --card-radius: 24px;
  --card-radius-sm: 16px;
  --btn-radius: 12px;

  /* Shadows */
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-glow-cyan: 0 0 40px rgba(0, 212, 255, 0.15);
  --shadow-glow-gold: 0 0 40px rgba(246, 211, 101, 0.15);

  /* Transitions */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 0.5s cubic-bezier(0.68, -0.55, 0.27, 1.55);
}

/* Site search and back-to-top controls */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.logo-image {
  display: block;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  object-fit: contain;
}
.site-search-form {
  position: relative;
  display: flex;
  gap: 6px;
}
.site-search-form input {
  min-width: 150px;
  padding: 9px 12px;
  color: var(--text-primary);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
}
.site-search-form button {
  padding: 9px 12px;
  color: #001018;
  font-weight: 700;
  background: var(--accent-cyan);
  border: 0;
  border-radius: 8px;
  cursor: pointer;
}
.site-search-results {
  position: absolute;
  z-index: 1001;
  top: calc(100% + 8px);
  right: 0;
  width: min(320px, 90vw);
  display: grid;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.35);
}
.site-search-results:empty { display: none; }
.site-search-results a,
.site-search-results span {
  padding: 10px 12px;
  color: var(--text-primary);
  text-decoration: none;
}
.site-search-results a:hover,
.site-search-results a:focus { background: rgba(0, 212, 255, 0.12); }
.site-search-floating {
  position: fixed;
  z-index: 900;
  top: 90px;
  right: 20px;
}
.back-to-top {
  position: fixed;
  z-index: 1000;
  right: 22px;
  bottom: 22px;
  width: 46px;
  height: 46px;
  color: #001018;
  font-size: 1.5rem;
  background: var(--accent-cyan);
  border: 0;
  border-radius: 50%;
  box-shadow: 0 8px 25px rgba(0, 212, 255, 0.35);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.2s, transform 0.2s, visibility 0.2s;
}
.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-to-top.persistent {
  width: auto;
  min-width: 46px;
  padding: 0 14px;
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
@media (max-width: 900px) {
  .nav-search { display: none; }
  .site-search-floating { left: 14px; right: 70px; }
  .site-search-floating input { min-width: 0; width: 100%; }
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  scrollbar-width: thin;
  scrollbar-color: var(--accent-cyan) var(--bg-secondary);
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}
::-webkit-scrollbar-thumb {
  background: var(--accent-cyan);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--accent-gold);
}

/* ── Typography ── */
h1, h2, h3, h4, h5, h6 {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

a {
  color: var(--accent-cyan);
  text-decoration: none;
  transition: var(--transition-fast);
}
a:hover {
  color: var(--accent-gold);
}

/* ── Container ── */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ── Glass Card ── */
.glass-card {
  background: var(--gradient-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-glass);
  border-radius: var(--card-radius);
  box-shadow: var(--shadow-card);
  transition: var(--transition-normal);
}
.glass-card:hover {
  border-color: var(--border-glass-hover);
  background: var(--bg-card-hover);
}

/* ── Section Common ── */
.section {
  padding: var(--section-padding);
  position: relative;
}

.section-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  border-radius: 100px;
  background: var(--accent-cyan-dim);
  border: 1px solid rgba(0, 212, 255, 0.2);
  color: var(--accent-cyan);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 20px;
}

.section-title {
  font-size: clamp(2rem, 5vw, 3.2rem);
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 600px;
  line-height: 1.8;
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}
.section-header .section-subtitle {
  margin: 0 auto;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: var(--btn-radius);
  font-family: 'Inter', sans-serif;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  transition: var(--transition-normal);
  position: relative;
  overflow: hidden;
}
.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.1), transparent);
  opacity: 0;
  transition: var(--transition-fast);
}
.btn:hover::after {
  opacity: 1;
}

.btn-primary {
  background: var(--gradient-accent);
  color: #000;
  box-shadow: var(--shadow-glow-cyan);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 60px rgba(0, 212, 255, 0.3);
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-glass);
}
.btn-secondary:hover {
  border-color: var(--accent-cyan);
  background: var(--accent-cyan-dim);
}

.btn-icon {
  width: 48px;
  height: 48px;
  padding: 0;
  border-radius: 12px;
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  color: var(--text-primary);
  cursor: pointer;
  transition: var(--transition-normal);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.btn-icon:hover {
  border-color: var(--accent-cyan);
  background: var(--accent-cyan-dim);
  color: var(--accent-cyan);
  transform: translateY(-2px);
}

/* ── Navigation ── */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: var(--transition-normal);
}
.navbar.scrolled {
  padding: 10px 0;
  background: rgba(6, 6, 15, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-glass);
}
.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: 'Outfit', sans-serif;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-primary);
}
.nav-logo .logo-icon {
  width: 36px;
  height: 36px;
  background: var(--gradient-accent);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  color: #000;
  font-weight: 900;
}
.nav-logo span {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}
.nav-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  position: relative;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-accent);
  transition: var(--transition-normal);
  border-radius: 1px;
}
.nav-links a:hover {
  color: var(--text-primary);
}
.nav-links a:hover::after {
  width: 100%;
}
.nav-cta {
  padding: 10px 24px !important;
  font-size: 0.85rem !important;
}
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
}
.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition-normal);
}

/* ── Hero Section ── */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  background: var(--gradient-hero);
  text-align: center;
  padding-top: 80px;
}
.hero-bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
  z-index: 0;
}
.hero-bg canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.4;
  animation: orbFloat 8s ease-in-out infinite alternate;
}
.hero-orb-1 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(0, 212, 255, 0.3), transparent);
  top: -10%;
  right: -5%;
}
.hero-orb-2 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.25), transparent);
  bottom: -10%;
  left: -5%;
  animation-delay: -4s;
}
.hero-orb-3 {
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(246, 211, 101, 0.2), transparent);
  top: 40%;
  left: 50%;
  transform: translateX(-50%);
  animation-delay: -2s;
}
.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  padding: 0 24px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  border-radius: 100px;
  background: rgba(0, 212, 255, 0.08);
  border: 1px solid rgba(0, 212, 255, 0.2);
  color: var(--accent-cyan);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 32px;
  animation: fadeInUp 0.8s ease-out 0.2s both;
}
.hero-badge .pulse-dot {
  width: 8px;
  height: 8px;
  background: var(--accent-cyan);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}
.hero-title {
  font-size: clamp(2.8rem, 7vw, 5rem);
  font-weight: 900;
  margin-bottom: 24px;
  animation: fadeInUp 0.8s ease-out 0.4s both;
  line-height: 1.05;
}
.hero-title .highlight {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-title .highlight-gold {
  background: var(--gradient-gold);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-description {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto 40px;
  line-height: 1.8;
  animation: fadeInUp 0.8s ease-out 0.6s both;
}
.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease-out 0.8s both;
}
.hero-stats {
  display: flex;
  gap: 48px;
  justify-content: center;
  margin-top: 64px;
  animation: fadeInUp 0.8s ease-out 1s both;
}
.hero-stat {
  text-align: center;
}
.hero-stat-value {
  font-family: 'Outfit', sans-serif;
  font-size: 2rem;
  font-weight: 800;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-stat-label {
  font-size: 0.85rem;
  color: var(--text-tertiary);
  margin-top: 4px;
}

/* ── Converter Section ── */
.converter-section {
  background: var(--bg-secondary);
  position: relative;
}
.converter-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-cyan), transparent);
}

.converter-card {
  max-width: 700px;
  margin: 0 auto;
  padding: 48px;
  position: relative;
}
.converter-card::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: var(--card-radius);
  padding: 1px;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.3), transparent, rgba(246, 211, 101, 0.3));
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

.converter-input-group {
  margin-bottom: 16px;
}
.converter-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 10px;
}
.converter-label .label-icon {
  width: 20px;
  height: 20px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 800;
}
.label-from .label-icon {
  background: var(--accent-cyan-dim);
  color: var(--accent-cyan);
}
.label-to .label-icon {
  background: var(--accent-purple-dim);
  color: var(--accent-purple);
}

.converter-input-row {
  display: flex;
  gap: 12px;
}
.converter-input {
  flex: 1;
  padding: 16px 20px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-glass);
  border-radius: var(--card-radius-sm);
  color: var(--text-primary);
  font-family: 'Outfit', sans-serif;
  font-size: 1.5rem;
  font-weight: 600;
  outline: none;
  transition: var(--transition-normal);
}
.converter-input:focus {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 0 3px var(--accent-cyan-dim), var(--shadow-glow-cyan);
  background: rgba(0, 212, 255, 0.03);
}
.converter-input::placeholder {
  color: var(--text-tertiary);
  font-weight: 400;
}
.converter-select {
  padding: 16px 16px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-glass);
  border-radius: var(--card-radius-sm);
  color: var(--text-primary);
  font-family: 'Inter', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  outline: none;
  cursor: pointer;
  min-width: 120px;
  transition: var(--transition-normal);
  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='%2300d4ff' 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 14px center;
  padding-right: 40px;
}
.converter-select:focus {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 0 3px var(--accent-cyan-dim);
}
.converter-select option {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.converter-swap {
  display: flex;
  justify-content: center;
  margin: 20px 0;
}
.swap-btn {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--gradient-accent);
  border: none;
  color: #000;
  cursor: pointer;
  transition: var(--transition-normal);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-glow-cyan);
}
.swap-btn:hover {
  transform: rotate(180deg) scale(1.1);
  box-shadow: 0 0 60px rgba(0, 212, 255, 0.4);
}
.swap-btn svg {
  width: 22px;
  height: 22px;
}

.converter-result {
  margin-top: 24px;
  padding: 20px 24px;
  background: rgba(0, 212, 255, 0.05);
  border: 1px solid rgba(0, 212, 255, 0.15);
  border-radius: var(--card-radius-sm);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.result-text {
  font-family: 'Outfit', sans-serif;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}
.result-text .result-value {
  color: var(--accent-cyan);
  font-size: 1.3rem;
}
.result-actions {
  display: flex;
  gap: 8px;
}
.converter-action-btn {
  padding: 9px 14px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-glass);
  border-radius: 10px;
  color: var(--text-secondary);
  font-family: 'Inter', sans-serif;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-normal);
}
.converter-action-btn:hover,
.converter-action-btn.copied {
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
  background: var(--accent-cyan-dim);
}

.converter-formula {
  margin-top: 20px;
  padding: 16px 20px;
  background: rgba(168, 85, 247, 0.05);
  border: 1px solid rgba(168, 85, 247, 0.12);
  border-radius: var(--card-radius-sm);
  font-size: 0.9rem;
  color: var(--text-secondary);
  text-align: center;
}
.converter-formula strong {
  color: var(--accent-purple);
}
.calculator-diagram {
  display: grid;
  grid-template-columns: 1fr 110px 1fr;
  align-items: center;
  gap: 16px;
  margin-top: 26px;
  padding: 24px;
  border: 1px solid rgba(0, 212, 255, 0.16);
  border-radius: var(--card-radius-sm);
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.06), rgba(168, 85, 247, 0.06));
  overflow: hidden;
}
.diagram-node {
  min-width: 0;
  padding: 18px;
  border: 1px solid var(--border-glass);
  border-radius: 14px;
  background: rgba(6, 6, 15, 0.65);
  text-align: center;
  transition: var(--transition-normal);
}
.diagram-node.diagram-source {
  border-color: rgba(0, 212, 255, 0.45);
  box-shadow: 0 0 24px rgba(0, 212, 255, 0.1);
}
.diagram-node.diagram-target {
  border-color: rgba(246, 211, 101, 0.45);
  box-shadow: 0 0 24px rgba(246, 211, 101, 0.1);
}
.diagram-node-label,
.diagram-node small {
  display: block;
  color: var(--text-tertiary);
  font-size: 0.75rem;
}
.diagram-node strong {
  display: block;
  margin: 6px 0;
  color: var(--text-primary);
  font: 700 clamp(1.1rem, 3vw, 1.5rem) 'Outfit', sans-serif;
  overflow-wrap: anywhere;
}
.diagram-connector {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 70px;
}
.diagram-connector span {
  position: relative;
  z-index: 1;
  padding: 7px 9px;
  border: 1px solid rgba(168, 85, 247, 0.35);
  border-radius: 8px;
  background: var(--bg-secondary);
  color: var(--accent-purple);
  font-size: 0.72rem;
  font-weight: 700;
  text-align: center;
}
.diagram-connector i {
  position: absolute;
  left: -18px;
  right: -18px;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-purple), var(--accent-gold));
}
.diagram-connector i::after {
  content: '';
  position: absolute;
  right: 0;
  top: -4px;
  width: 9px;
  height: 9px;
  border-top: 2px solid var(--accent-gold);
  border-right: 2px solid var(--accent-gold);
  transform: rotate(45deg);
}
.diagram-meter {
  grid-column: 1 / -1;
  height: 8px;
  border-radius: 8px;
  background: rgba(255,255,255,0.08);
}
.diagram-meter span {
  display: block;
  width: 50%;
  height: 100%;
  border-radius: inherit;
  background: var(--gradient-accent);
  box-shadow: var(--shadow-glow-cyan);
  transition: width var(--transition-normal);
}

/* ── Visual Diagram Section ── */
.diagram-section {
  background: var(--bg-primary);
  position: relative;
  overflow: hidden;
}
.diagram-section::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(0, 212, 255, 0.04), transparent 70%);
  pointer-events: none;
}

.diagram-tabs {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}
.diagram-tab {
  padding: 12px 24px;
  border-radius: 100px;
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  color: var(--text-secondary);
  font-family: 'Inter', sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-normal);
}
.diagram-tab:hover {
  border-color: var(--border-glass-hover);
  color: var(--text-primary);
}
.diagram-tab.active {
  background: var(--accent-cyan-dim);
  border-color: rgba(0, 212, 255, 0.3);
  color: var(--accent-cyan);
  box-shadow: var(--shadow-glow-cyan);
}

.diagram-viewport {
  position: relative;
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
  aspect-ratio: 16 / 9;
  border-radius: var(--card-radius);
  overflow: hidden;
  border: 1px solid var(--border-glass);
  background: rgba(0, 0, 0, 0.3);
}
.diagram-viewport canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
.diagram-panel {
  display: none;
  width: 100%;
  height: 100%;
}
.diagram-panel.active {
  display: block;
}

.diagram-legend {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-top: 24px;
  flex-wrap: wrap;
}
.legend-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}
.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

/* ── Conversion Table ── */
.table-section {
  background: var(--bg-secondary);
}
.conversion-table-wrapper {
  max-width: 800px;
  margin: 0 auto;
  border-radius: var(--card-radius);
  overflow: hidden;
  border: 1px solid var(--border-glass);
}
.conversion-table {
  width: 100%;
  border-collapse: collapse;
}
.conversion-table thead {
  background: rgba(0, 212, 255, 0.08);
}
.conversion-table th {
  padding: 18px 24px;
  text-align: left;
  font-family: 'Outfit', sans-serif;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border-bottom: 1px solid var(--border-glass);
}
.conversion-table td {
  padding: 16px 24px;
  font-size: 0.95rem;
  color: var(--text-secondary);
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
  transition: var(--transition-fast);
}
.language-bar {
  position: relative;
  z-index: 10;
  margin-top: 32px;
  padding: 28px 0;
  border-top: 1px solid rgba(0, 212, 255, 0.12);
  border-bottom: 1px solid rgba(0, 212, 255, 0.12);
}
.language-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px 14px;
}
.language-btn {
  padding: 9px 15px;
  border: 1px solid rgba(0, 154, 214, 0.48);
  border-radius: 10px;
  background: rgba(9, 32, 54, 0.8);
  color: #b9d9ed;
  font-family: 'Inter', sans-serif;
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-fast);
}
.language-btn:hover,
.language-btn.active {
  border-color: var(--accent-cyan);
  background: var(--accent-cyan-dim);
  color: #fff;
  box-shadow: 0 0 20px rgba(0, 212, 255, 0.12);
  transform: translateY(-2px);
}
.language-btn:focus-visible {
  outline: 2px solid var(--accent-gold);
  outline-offset: 3px;
}
.language-btn:disabled {
  cursor: wait;
  opacity: 0.65;
}
.language-btn.loading {
  border-color: var(--accent-gold);
}
html[dir="rtl"] .section-subtitle,
html[dir="rtl"] .definition-card,
html[dir="rtl"] .step-card,
html[dir="rtl"] .faq-answer-inner {
  text-align: right;
}
.conversion-table tbody tr {
  transition: var(--transition-fast);
}
.conversion-table tbody tr:hover {
  background: rgba(0, 212, 255, 0.03);
}
.conversion-table tbody tr:hover td {
  color: var(--text-primary);
}
.conversion-table td:first-child {
  font-family: 'Outfit', sans-serif;
  font-weight: 600;
  color: var(--text-primary);
}
.conversion-table td:last-child {
  font-family: 'Outfit', sans-serif;
  font-weight: 600;
  color: var(--accent-cyan);
}

/* ── How It Works ── */
.how-section {
  background: var(--bg-primary);
}
.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  max-width: 1000px;
  margin: 0 auto;
  position: relative;
}
.steps-grid::before {
  content: '';
  position: absolute;
  top: 60px;
  left: 15%;
  right: 15%;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-purple), var(--accent-gold));
  opacity: 0.3;
  z-index: 0;
}
.step-card {
  text-align: center;
  padding: 40px 28px;
  position: relative;
  z-index: 1;
}
.step-number {
  width: 64px;
  height: 64px;
  margin: 0 auto 24px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Outfit', sans-serif;
  font-size: 1.5rem;
  font-weight: 800;
  color: #000;
  position: relative;
}
.step-card:nth-child(1) .step-number {
  background: var(--gradient-accent);
  box-shadow: var(--shadow-glow-cyan);
}
.step-card:nth-child(2) .step-number {
  background: linear-gradient(135deg, #a855f7, #6366f1);
  box-shadow: 0 0 40px rgba(168, 85, 247, 0.3);
}
.step-card:nth-child(3) .step-number {
  background: var(--gradient-gold);
  box-shadow: var(--shadow-glow-gold);
}
.step-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 12px;
}
.step-description {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ── Definitions ── */
.definitions-section {
  background: var(--bg-secondary);
}
.definitions-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}
.definition-card {
  padding: 40px;
}
.definition-card .def-icon {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  font-family: 'Outfit', sans-serif;
  font-weight: 900;
  font-size: 1.2rem;
}
.definition-card:first-child .def-icon {
  background: var(--accent-cyan-dim);
  color: var(--accent-cyan);
  border: 1px solid rgba(0, 212, 255, 0.2);
}
.definition-card:last-child .def-icon {
  background: var(--accent-purple-dim);
  color: var(--accent-purple);
  border: 1px solid rgba(168, 85, 247, 0.2);
}
.definition-card h3 {
  font-size: 1.4rem;
  margin-bottom: 16px;
}
.definition-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.8;
  margin-bottom: 12px;
}
.definition-card .def-formula {
  margin-top: 16px;
  padding: 14px 20px;
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--card-radius-sm);
  border: 1px solid var(--border-glass);
  font-family: 'Outfit', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent-gold);
}

/* ── FAQ ── */
.faq-section {
  background: var(--bg-primary);
}
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.faq-item {
  border: 1px solid var(--border-glass);
  border-radius: var(--card-radius-sm);
  overflow: hidden;
  transition: var(--transition-normal);
}
.faq-item:hover {
  border-color: var(--border-glass-hover);
}
.faq-item.active {
  border-color: rgba(0, 212, 255, 0.2);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.2);
}
.faq-question {
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  cursor: pointer;
  background: var(--bg-card);
  transition: var(--transition-normal);
  width: 100%;
  border: none;
  text-align: left;
  font-family: 'Inter', sans-serif;
  color: var(--text-primary);
}
.faq-question:hover {
  background: var(--bg-card-hover);
}
.faq-question h4 {
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.5;
}
.faq-question .faq-icon {
  width: 32px;
  height: 32px;
  min-width: 32px;
  border-radius: 8px;
  background: var(--accent-cyan-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-normal);
}
.faq-item.active .faq-icon {
  transform: rotate(45deg);
  background: var(--accent-cyan);
  color: #000;
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}
.faq-answer-inner {
  padding: 0 24px 24px;
  color: var(--text-secondary);
  line-height: 1.8;
  font-size: 0.95rem;
}

/* ── Footer ── */
.footer {
  background: var(--bg-secondary);
  padding: 48px 0 32px;
  border-top: 1px solid var(--border-glass);
}
.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}
.footer-brand .logo-icon {
  width: 32px;
  height: 32px;
  background: var(--gradient-accent);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  color: #000;
  font-weight: 900;
  font-family: 'Outfit', sans-serif;
}
.footer-brand span {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: 1.1rem;
}
.footer-links {
  display: flex;
  gap: 24px;
  list-style: none;
}
.footer-links a {
  color: var(--text-tertiary);
  font-size: 0.85rem;
}
.footer-links a:hover {
  color: var(--accent-cyan);
}
.footer-copy {
  width: 100%;
  text-align: center;
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid var(--border-glass);
  font-size: 0.8rem;
  color: var(--text-tertiary);
}

/* ── Animations ── */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.5); }
}

@keyframes orbFloat {
  from { transform: translateY(0) scale(1); }
  to { transform: translateY(-40px) scale(1.1); }
}

@keyframes glow {
  0%, 100% { box-shadow: 0 0 20px rgba(0, 212, 255, 0.2); }
  50% { box-shadow: 0 0 40px rgba(0, 212, 255, 0.4); }
}

.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease-out, transform 0.7s ease-out;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}
.fade-in-delay-1 { transition-delay: 0.1s; }
.fade-in-delay-2 { transition-delay: 0.2s; }
.fade-in-delay-3 { transition-delay: 0.3s; }

/* Interactive content diagrams */
.interactive-panel { max-width: 900px; margin: 40px auto 0; padding: 30px; }
.interactive-label { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-bottom: 22px; color: var(--text-secondary); font-weight: 600; }
.interactive-label span { color: var(--text-primary); font-family: 'Outfit', sans-serif; font-size: 1.1rem; }
.interactive-label output { color: var(--accent-cyan); text-align: right; }
.interactive-note, .shortcut-note { margin-top: 18px; color: var(--text-tertiary); font-size: 0.9rem; text-align: center; }
.data-range { width: 100%; accent-color: var(--accent-cyan); cursor: pointer; }
.scale-track { position: relative; display: flex; justify-content: space-between; margin-top: 16px; padding-top: 16px; color: var(--text-tertiary); font-size: 0.8rem; overflow: hidden; }
.scale-track::before, .scale-fill { content: ''; position: absolute; top: 0; left: 0; height: 5px; border-radius: 5px; }
.scale-track::before { width: 100%; background: rgba(255,255,255,0.08); }
.scale-fill { width: 0; background: var(--gradient-accent); box-shadow: var(--shadow-glow-cyan); transition: width var(--transition-normal); }
.bit-grid { display: grid; grid-template-columns: repeat(8, 1fr); gap: 10px; }
.bit-cell { aspect-ratio: 1; border: 1px solid var(--border-glass); border-radius: 12px; background: rgba(255,255,255,0.04); color: var(--text-tertiary); font: 700 1.2rem 'Outfit', sans-serif; cursor: pointer; transition: var(--transition-normal); }
.bit-cell[aria-pressed="true"] { color: #001016; border-color: var(--accent-cyan); background: var(--accent-cyan); box-shadow: var(--shadow-glow-cyan); transform: translateY(-4px); }
.storage-meter { height: 54px; margin-top: 16px; padding: 5px; border: 1px solid var(--border-glass); border-radius: 14px; background: rgba(0,0,0,0.25); }
.storage-meter div { height: 100%; border-radius: 9px; background: repeating-linear-gradient(90deg, var(--accent-cyan) 0 22px, #087da0 22px 25px); box-shadow: var(--shadow-glow-cyan); transition: width var(--transition-normal); }
.interaction-status { max-width: 800px; margin: 16px auto 0; color: var(--text-tertiary); font-size: 0.85rem; text-align: right; }
.segmented-control { display: flex; width: fit-content; padding: 5px; border: 1px solid var(--border-glass); border-radius: 14px; background: rgba(0,0,0,0.2); }
.segment-btn { padding: 10px 18px; border: 0; border-radius: 10px; background: transparent; color: var(--text-secondary); font-weight: 600; cursor: pointer; transition: var(--transition-fast); }
.segment-btn.active { background: var(--accent-cyan-dim); color: var(--accent-cyan); }
.unit-switcher { display: grid; grid-template-columns: auto 1fr; align-items: center; gap: 28px; }
.unit-equation { display: flex; flex-direction: column; gap: 5px; }
.unit-equation strong { color: var(--accent-cyan); font: 700 1.4rem 'Outfit', sans-serif; }
.unit-equation span { color: var(--text-tertiary); }
.block-visual { grid-column: 1 / -1; height: 36px; border-radius: 10px; background: repeating-linear-gradient(90deg, var(--accent-cyan) 0 7px, transparent 7px 9px); opacity: 0.75; transition: var(--transition-normal); }
.block-visual.binary { background: repeating-linear-gradient(90deg, var(--accent-purple) 0 7px, transparent 7px 9px); }
.block-visual.large { height: 54px; }
.lab-controls, .unit-explorer-controls { display: flex; align-items: center; gap: 16px; }
.lab-controls .converter-input, .unit-explorer-controls .converter-input { min-width: 0; }
.formula-flow { display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 14px; margin-top: 24px; }
.formula-flow span, .formula-flow strong { padding: 12px 16px; border-radius: 10px; background: rgba(255,255,255,0.05); }
.formula-flow i { color: var(--accent-gold); font-size: 1.4rem; font-style: normal; }
.formula-flow strong { color: var(--accent-cyan); border: 1px solid rgba(0,212,255,0.25); }
.conversion-table tbody tr { cursor: pointer; transition: var(--transition-fast); }
.conversion-table tbody tr:hover, .conversion-table tbody tr:focus, .conversion-table tbody tr.active { outline: none; background: var(--accent-cyan-dim); }
.table-visual { max-width: 900px; margin: 20px auto 0; padding: 22px; }
.table-visual::before { content: '1 GB'; display: block; margin-bottom: 8px; color: var(--text-tertiary); font-size: 0.8rem; text-align: right; }
.table-bar { width: 0; height: 18px; border-radius: 10px; background: var(--gradient-accent); box-shadow: var(--shadow-glow-cyan); transition: width var(--transition-slow); }
.table-visual p { margin-top: 14px; color: var(--text-secondary); }
.conversion-ladder { display: flex; align-items: center; justify-content: center; gap: 12px; }
.conversion-ladder button { min-width: 105px; padding: 16px; border: 1px solid var(--border-glass); border-radius: 16px; background: rgba(255,255,255,0.04); color: var(--text-primary); font: 700 1.1rem 'Outfit', sans-serif; cursor: pointer; transition: var(--transition-normal); }
.conversion-ladder button strong { display: block; margin-top: 4px; color: var(--text-tertiary); font: 500 0.72rem 'Inter', sans-serif; }
.conversion-ladder button.active { color: var(--accent-cyan); border-color: var(--accent-cyan); transform: translateY(-5px); box-shadow: var(--shadow-glow-cyan); }
.conversion-ladder > span { color: var(--accent-gold); font-size: 0.75rem; }
.unit-explorer-controls label { color: var(--text-secondary); font-weight: 600; }
.unit-result-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; margin-top: 24px; }
.unit-result-grid div { padding: 18px 10px; border: 1px solid var(--border-glass); border-radius: 14px; background: rgba(255,255,255,0.03); text-align: center; }
.unit-result-grid strong, .unit-result-grid span { display: block; }
.unit-result-grid strong { color: var(--accent-cyan); overflow-wrap: anywhere; }
.unit-result-grid span { color: var(--text-tertiary); font-size: 0.75rem; }
.converter-shortcut { cursor: pointer; }
.converter-shortcut::after { content: 'Open in calculator →'; display: block; margin-top: 18px; color: var(--accent-cyan); font-size: 0.85rem; font-weight: 600; }
.converter-shortcut:focus { outline: 2px solid var(--accent-cyan); outline-offset: 4px; }
.tools-page { background: var(--bg-primary); }
.tool-page-main { padding-top: 82px; }
.tool-hero { background: radial-gradient(circle at 50% 0, rgba(0, 212, 255, 0.08), transparent 50%); }
.tool-hero .section-title, .tool-hero .section-subtitle { max-width: 850px; margin-left: auto; margin-right: auto; text-align: center; }
.tool-question { max-width: 760px; margin: 28px auto 0; padding: 22px 26px; border-left: 3px solid var(--accent-gold); }
.tool-question span { display: block; margin-bottom: 8px; color: var(--accent-gold); font-size: 0.75rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; }
.tool-question h2 { color: var(--text-primary); font-size: 1.35rem; }
.tool-intent-visual {
  display: grid;
  grid-template-columns: 1fr 150px 1fr;
  align-items: center;
  gap: 18px;
  max-width: 760px;
  margin: 30px auto;
  padding: 24px;
}
.intent-unit {
  padding: 22px;
  border: 1px solid var(--border-glass);
  border-radius: 16px;
  background: rgba(255,255,255,0.04);
  text-align: center;
}
.intent-unit span,
.intent-unit strong {
  display: block;
}
.intent-unit span {
  color: var(--text-tertiary);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.intent-unit strong {
  margin-top: 7px;
  color: var(--accent-cyan);
  font: 700 1.3rem 'Outfit', sans-serif;
}
.intent-target strong {
  color: var(--accent-gold);
}
.intent-flow {
  position: relative;
  text-align: center;
}
.intent-flow i {
  display: block;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-purple), var(--accent-gold));
}
.intent-flow b {
  display: inline-block;
  position: relative;
  margin-top: -15px;
  padding: 5px 9px;
  border-radius: 7px;
  background: var(--bg-secondary);
  color: var(--accent-purple);
  font-size: 0.7rem;
  text-transform: uppercase;
}
.tool-converter { margin-top: 30px; }
.tool-converter #tool-secondary-wrap { margin-top: 20px; }
.tool-converter #tool-secondary-wrap .converter-input { width: 100%; }
.tool-arrow { display: inline-flex; width: 42px; height: 42px; align-items: center; justify-content: center; border-radius: 50%; background: var(--gradient-accent); color: #001016; font-size: 1.5rem; font-weight: 700; }
.tool-live-diagram { display: grid; grid-template-columns: 1fr 100px 1fr; align-items: center; gap: 14px; margin-top: 24px; padding: 20px; border: 1px solid rgba(0, 212, 255, 0.2); border-radius: 16px; background: rgba(0, 212, 255, 0.04); text-align: center; }
.tool-live-diagram div { padding: 14px; border-radius: 12px; background: rgba(255,255,255,0.05); }
.tool-live-diagram span, .tool-live-diagram strong { display: block; }
.tool-live-diagram span { color: var(--text-tertiary); font-size: 0.75rem; }
.tool-live-diagram strong { margin-top: 5px; color: var(--accent-cyan); font: 700 1.25rem 'Outfit', sans-serif; overflow-wrap: anywhere; }
.tool-live-diagram b { color: var(--accent-purple); font-size: 0.8rem; overflow-wrap: anywhere; }
.tool-process-visual {
  display: grid;
  grid-template-columns: 1fr 34px 1fr 34px 1fr;
  align-items: center;
  gap: 10px;
  max-width: 900px;
  margin: 34px auto 0;
  padding: 24px;
  text-align: center;
}
.tool-process-visual > div:not(.process-meter) {
  min-width: 0;
  padding: 18px 12px;
  border-radius: 13px;
  background: rgba(255,255,255,0.04);
}
.tool-process-visual span,
.tool-process-visual strong {
  display: block;
}
.tool-process-visual span {
  color: var(--text-tertiary);
  font-size: 0.72rem;
  text-transform: uppercase;
}
.tool-process-visual strong {
  margin-top: 7px;
  color: var(--text-primary);
  overflow-wrap: anywhere;
}
.tool-process-visual > i {
  color: var(--accent-gold);
  font-size: 1.4rem;
  font-style: normal;
}
.process-meter {
  grid-column: 1 / -1;
  height: 7px;
  margin-top: 8px;
  border-radius: 8px;
  background: rgba(255,255,255,0.08);
  overflow: hidden;
}
.process-meter b {
  display: block;
  width: 8%;
  height: 100%;
  border-radius: inherit;
  background: var(--gradient-accent);
  transition: width var(--transition-normal);
}
.tool-sample-visual {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  max-width: 800px;
  margin: 22px auto 0;
  padding: 20px;
}
.tool-sample-visual > span {
  color: var(--text-primary);
  font-weight: 700;
}
.tool-sample-visual > div {
  display: flex;
  gap: 8px;
}
.tool-sample-visual button {
  padding: 8px 12px;
  border: 1px solid var(--border-glass);
  border-radius: 9px;
  background: rgba(255,255,255,0.04);
  color: var(--text-secondary);
  cursor: pointer;
}
.tool-sample-visual button:hover,
.tool-sample-visual button.active {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  background: var(--accent-cyan-dim);
}
.tool-sample-visual output {
  flex-basis: 100%;
  color: var(--text-tertiary);
  font-size: 0.85rem;
}
.tool-category { margin-top: 58px; }
.tool-category h2 { margin-bottom: 20px; color: var(--text-primary); font-size: 1.7rem; }
.tool-link-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.tool-link-card { display: flex; min-height: 105px; flex-direction: column; justify-content: space-between; gap: 12px; padding: 18px; color: var(--text-primary); }
.homepage-tool-directory { margin-top: 70px; }
.homepage-tool-directory .tool-link-card { width: 100%; font-family: 'Inter', sans-serif; text-align: left; cursor: pointer; }
.tool-link-card:hover { color: var(--text-primary); border-color: var(--accent-cyan); transform: translateY(-3px); }
.tool-link-card strong { color: var(--accent-cyan); font-family: 'Outfit', sans-serif; }
.tool-link-card span { color: var(--text-tertiary); font-size: 0.8rem; }
.info-page { background: var(--bg-primary); }
.info-main { padding: 150px 0 80px; }
.info-article { max-width: 920px; }
.info-article > .section-title { margin-bottom: 18px; }
.info-lead {
  max-width: 760px;
  margin-bottom: 48px;
  color: var(--text-secondary);
  font-size: 1.15rem;
  line-height: 1.85;
}
.info-updated {
  margin: -6px 0 20px;
  color: var(--text-tertiary);
  font-size: 0.9rem;
}
.info-article > section {
  margin-top: 18px;
  padding: 28px;
  border: 1px solid var(--border-glass);
  border-radius: var(--card-radius-sm);
  background: var(--gradient-card);
}
.info-article section h2 {
  margin-bottom: 12px;
  color: var(--text-primary);
  font-size: 1.45rem;
}
.info-article section p {
  color: var(--text-secondary);
}
.info-article code {
  padding: 2px 6px;
  border-radius: 5px;
  background: rgba(0,212,255,0.1);
  color: var(--accent-cyan);
}
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin-bottom: 34px;
}
.info-article .contact-card {
  margin: 0;
  padding: 28px;
}
.contact-card p + p { margin-top: 14px; }
.keyword-conversion-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  padding: 30px;
}
.keyword-conversion-main {
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.keyword-heading,
.keyword-reference-title {
  color: var(--text-primary);
  font: 700 1.1rem 'Outfit', sans-serif;
}
.keyword-formula {
  margin: 18px 0 24px;
  padding: 18px 20px;
  border-radius: 12px;
  background: rgba(255,255,255,0.05);
  color: var(--accent-cyan);
  font: 1.05rem 'Outfit', sans-serif;
}
.keyword-result {
  padding: 30px 24px;
  border: 1px solid rgba(0, 212, 255, 0.45);
  border-radius: 16px;
  background: rgba(0, 92, 135, 0.18);
  text-align: center;
}
.keyword-result span,
.keyword-result strong {
  display: block;
}
.keyword-result span {
  color: var(--text-secondary);
  font-size: 1rem;
}
.keyword-result strong {
  margin-top: 8px;
  color: var(--accent-cyan);
  font: 700 clamp(2rem, 5vw, 3.2rem) 'Outfit', sans-serif;
}
.keyword-reference-title {
  margin-bottom: 16px;
}
.keyword-list {
  display: grid;
  gap: 9px;
  max-height: 430px;
  overflow-y: auto;
  padding-right: 4px;
}
.keyword-list button {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  padding: 13px 15px;
  border: 1px solid transparent;
  border-radius: 10px;
  background: rgba(255,255,255,0.05);
  color: var(--text-secondary);
  font: 0.95rem 'Inter', sans-serif;
  text-align: left;
  cursor: pointer;
  transition: var(--transition-fast);
}
.keyword-list button:hover,
.keyword-list button.active {
  border-color: var(--accent-cyan);
  background: rgba(0, 212, 255, 0.08);
  color: var(--text-primary);
}
.keyword-list button strong {
  color: var(--accent-cyan);
  white-space: nowrap;
}

/* ── Responsive ── */
@media (max-width: 1024px) {
  .steps-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }
  .definitions-grid {
    grid-template-columns: 1fr;
  }
  .unit-result-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .keyword-conversion-card {
    grid-template-columns: 1fr;
  }
  .tool-link-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --section-padding: 80px 0;
  }

  .nav-links {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(6, 6, 15, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 32px;
    z-index: 999;
  }
  .nav-links.open {
    display: flex;
  }
  .nav-links a {
    font-size: 1.2rem;
  }
  .nav-toggle {
    display: flex;
    z-index: 1001;
  }

  .hero-title {
    font-size: clamp(2rem, 8vw, 3rem);
  }
  .hero-stats {
    gap: 24px;
  }
  .hero-stat-value {
    font-size: 1.5rem;
  }

  .converter-card {
    padding: 28px 20px;
  }
  .calculator-diagram {
    grid-template-columns: 1fr;
    gap: 10px;
  }
  .diagram-connector {
    min-height: 42px;
  }
  .diagram-connector i {
    left: 50%;
    right: auto;
    top: 0;
    bottom: 0;
    width: 2px;
    height: auto;
    background: linear-gradient(180deg, var(--accent-cyan), var(--accent-purple), var(--accent-gold));
  }
  .diagram-connector i::after {
    right: -4px;
    top: auto;
    bottom: 0;
    transform: rotate(135deg);
  }
  .converter-input {
    font-size: 1.2rem;
    padding: 14px 16px;
  }

  .steps-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .steps-grid::before {
    display: none;
  }

  .diagram-viewport {
    aspect-ratio: 4 / 3;
  }

  .conversion-table th,
  .conversion-table td {
    padding: 12px 16px;
    font-size: 0.85rem;
  }
  .conversion-ladder {
    flex-wrap: wrap;
  }
  .conversion-ladder > span {
    display: none;
  }
  .unit-result-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .tool-page-main {
    padding-top: 68px;
  }
  .tool-live-diagram {
    grid-template-columns: 1fr;
  }
  .tool-intent-visual,
  .tool-process-visual {
    grid-template-columns: 1fr;
  }
  .intent-flow {
    min-height: 35px;
  }
  .intent-flow i {
    width: 2px;
    height: 35px;
    margin: 0 auto;
    background: linear-gradient(180deg, var(--accent-cyan), var(--accent-purple), var(--accent-gold));
  }
  .tool-process-visual > i {
    transform: rotate(90deg);
  }
  .process-meter {
    grid-column: auto;
  }
  .tool-link-grid {
    grid-template-columns: 1fr;
  }
  .info-main {
    padding-top: 120px;
  }
  .contact-grid {
    grid-template-columns: 1fr;
  }
  .info-article > section,
  .info-article .contact-card {
    padding: 22px 18px;
  }

  .footer-content {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .language-bar {
    padding: 22px 0;
  }
  .language-list {
    justify-content: flex-start;
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 8px;
    scrollbar-width: thin;
  }
  .language-btn {
    flex: 0 0 auto;
  }
  .converter-input-row {
    flex-direction: column;
  }
  .converter-select {
    width: 100%;
  }
  .interactive-panel {
    padding: 22px 16px;
  }
  .interactive-label,
  .lab-controls,
  .unit-explorer-controls {
    align-items: stretch;
    flex-direction: column;
  }
  .interactive-label output {
    text-align: left;
  }
  .bit-grid {
    gap: 5px;
  }
  .bit-cell {
    border-radius: 8px;
    font-size: 1rem;
  }
  .unit-switcher {
    grid-template-columns: 1fr;
  }
  .block-visual {
    grid-column: auto;
  }
  .segmented-control {
    width: 100%;
  }
  .segment-btn {
    flex: 1;
  }
  .unit-result-grid {
    grid-template-columns: 1fr;
  }
  .hero-stats {
    flex-direction: column;
    gap: 16px;
  }
  .diagram-tabs {
    gap: 6px;
  }
  .diagram-tab {
    padding: 10px 16px;
    font-size: 0.8rem;
  }
}