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

:root {
  --bg-primary: #000000;
  --bg-secondary: #1d1d1f;
  --bg-tertiary: #2d2d2f;
  --text-primary: #f5f5f7;
  --text-secondary: #86868b;
  --text-tertiary: #a1a1a6;
  --border: #424245;
  --border-light: #333336;
  --accent: #64b5f6;
  --accent-light: #90caf9;
  --accent-glow: 0 0 20px rgba(100, 181, 246, 0.3);
  --danger: #ff3b30;
  --counterfeit: #ff6b6b;
  --font-main: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'SF Pro Display', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --font-mono: 'SF Mono', 'Menlo', 'Monaco', 'Courier New', monospace;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --shadow-sm: 0 2px 20px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 30px rgba(0, 0, 0, 0.4);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --sidebar-width: 240px;
  --content-max-width: 800px;
}

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-main);
  line-height: 1.47059;
  font-weight: 400;
  letter-spacing: -0.022em;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.2;
  color: var(--text-primary);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 {
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--accent-light);
  margin-bottom: 1.5rem;
}
h4 { font-size: 1.3rem; }

p {
  margin-bottom: 1.5rem;
  line-height: 1.6;
  color: var(--text-secondary);
}

strong { font-weight: 600; color: var(--text-primary); }
em { font-style: italic; }

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

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--bg-tertiary);
  padding: 0.2rem 0.4rem;
  border-radius: var(--radius-sm);
}

ul, ol { margin-bottom: 1.5rem; padding-left: 1.5rem; }
li { margin-bottom: 0.5rem; color: var(--text-secondary); }

::selection { background: rgba(100, 181, 246, 0.3); color: var(--text-primary); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-tertiary); }

.container { display: flex; min-height: 100vh; width: 100%; }
.main {
  flex: 1;
  margin-left: var(--sidebar-width);
  padding: 3rem 2rem;
  max-width: 1200px;
  width: calc(100% - var(--sidebar-width));
}

.sidenav {
  width: var(--sidebar-width);
  height: 100vh;
  position: fixed;
  left: 0;
  top: 0;
  background: rgba(15, 15, 15, 0.97);
  border-right: 1px solid rgba(100, 181, 246, 0.2);
  padding: 2rem 0;
  z-index: 100;
  overflow-y: auto;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.sidenav-header {
  margin-bottom: 2rem;
  padding: 0 1.5rem 1.25rem;
  border-bottom: 1px solid rgba(100, 181, 246, 0.2);
}

.sidenav-header h1 {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 0.3rem;
}

.sidenav-subtitle {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  line-height: 1.4;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.nav-links { list-style: none; margin: 0; padding: 0; }
.nav-links li { margin: 0; padding: 0; }

.nav-links a {
  display: block;
  padding: 0.4rem 1.5rem;
  color: var(--text-secondary);
  font-size: 0.85rem;
  transition: var(--transition);
  border-left: 2px solid transparent;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.nav-links a:hover {
  color: var(--accent);
  background: rgba(100, 181, 246, 0.08);
  border-left-color: var(--accent);
}

.nav-links a.active {
  color: var(--accent);
  background: rgba(100, 181, 246, 0.12);
  border-left-color: var(--accent);
  font-weight: 500;
}

.nav-category {
  color: var(--text-tertiary);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin: 1.5rem 0 0.25rem 1.5rem;
  font-weight: 600;
}

.sidenav-toggle {
  display: none;
  position: fixed;
  top: 1.25rem;
  left: 1.25rem;
  background: rgba(100, 181, 246, 0.1);
  color: var(--accent);
  border: 1px solid var(--accent);
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  z-index: 1000;
  cursor: pointer;
  transition: var(--transition);
  align-items: center;
  justify-content: center;
}

.hero {
  margin-bottom: 3rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border);
}

.hero-content { text-align: center; max-width: var(--content-max-width); margin: 0 auto; }

.hero-eyebrow {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--text-tertiary);
  margin-bottom: 1rem;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 1rem;
  letter-spacing: -0.5px;
  line-height: 1.1;
}

.hero-line {
  font-size: 1.3rem;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
  font-weight: 300;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-divider {
  width: 60px;
  height: 2px;
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  margin: 1.5rem auto;
}

.hero-text { color: var(--text-secondary); font-size: 1.1rem; max-width: 600px; margin: 1rem auto; }
.hero-foot { margin-top: 2rem; }

.button {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.95rem;
  font-weight: 500;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
}

.button-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  color: #fff;
}
.button-primary:hover { transform: translateY(-2px); box-shadow: var(--accent-glow); }

.button-secondary {
  background: rgba(100, 181, 246, 0.1);
  border: 1px solid var(--accent);
  color: var(--accent);
}
.button-secondary:hover { background: rgba(100, 181, 246, 0.2); transform: translateY(-2px); }

.simple-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.6rem 1.2rem;
  background: rgba(100, 181, 246, 0.1);
  border: 1px solid rgba(100, 181, 246, 0.2);
  border-radius: var(--radius-sm);
  transition: var(--transition);
  text-decoration: none;
}
.simple-link:hover { background: rgba(100, 181, 246, 0.2); border-color: var(--accent); transform: translateX(4px); }

.nav-link-forward, .nav-link-backward {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--accent);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 0.75rem 1.5rem;
  background: rgba(100, 181, 246, 0.1);
  border: 1px solid rgba(100, 181, 246, 0.2);
  border-radius: var(--radius-sm);
  transition: var(--transition);
  text-decoration: none;
}
.nav-link-forward:hover { background: rgba(100, 181, 246, 0.2); border-color: var(--accent); transform: translateX(4px); }
.nav-link-backward:hover { background: rgba(100, 181, 246, 0.2); border-color: var(--accent); transform: translateX(-4px); }

.card, .simple-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 3rem 2.5rem;
  margin: 2rem auto;
  max-width: var(--content-max-width);
  transition: var(--transition);
}
.card:hover, .simple-box:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}
.card p { font-size: 1.1rem; line-height: 1.65; color: var(--text-secondary); margin-bottom: 1.2rem; }
.card p:last-child { margin-bottom: 0; }

.card-eyebrow {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--accent);
  margin-bottom: 0.75rem;
  font-weight: 600;
}

.practice-glance {
  background: rgba(100, 181, 246, 0.05);
  border: 1px solid rgba(100, 181, 246, 0.2);
  border-left: 4px solid var(--accent);
  padding: 1.5rem 1.8rem;
  border-radius: var(--radius-md);
  margin: 1.5rem auto 2.5rem;
  max-width: var(--content-max-width);
  transition: var(--transition);
}
.practice-glance:hover { border-color: rgba(100, 181, 246, 0.4); }
.practice-glance p { margin-bottom: 0.4rem; }
.practice-glance .glance-question { font-weight: 600; color: var(--text-primary); font-size: 1.1rem; }

.note {
  background: rgba(100, 181, 246, 0.05);
  border: 1px solid rgba(100, 181, 246, 0.2);
  border-left: 3px solid var(--accent);
  padding: 1.5rem;
  border-radius: var(--radius-md);
  margin: 2rem auto;
  max-width: var(--content-max-width);
  transition: var(--transition);
}
.note:hover { border-color: rgba(100, 181, 246, 0.3); transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.note h4 { color: var(--accent); margin-bottom: 1rem; font-size: 1.1rem; font-weight: 600; display: flex; align-items: center; gap: 0.5rem; }
.note p { margin-bottom: 0; color: var(--text-secondary); }

.process { margin: 2rem 0; }
.process-step {
  display: flex;
  gap: 1.75rem;
  margin-bottom: 2rem;
  align-items: flex-start;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 2rem;
  transition: var(--transition);
}
.process-step:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.process-step .step-number {
  flex-shrink: 0;
  width: 50px;
  height: 50px;
  background: var(--accent);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 600;
  box-shadow: 0 4px 15px rgba(100, 181, 246, 0.3);
  transition: var(--transition);
}
.process-step:hover .step-number { transform: scale(1.05); box-shadow: 0 6px 20px rgba(100, 181, 246, 0.4); }
.process-step .step-content { flex: 1; }
.process-step .step-content h4 { font-size: 1.3rem; margin-bottom: 1rem; color: var(--text-primary); font-weight: 600; padding-bottom: 0.75rem; position: relative; }
.process-step .step-content h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 40px;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
}
.process-step .step-content p { margin-bottom: 0; color: var(--text-secondary); line-height: 1.6; }

.installation-path {
  margin: 2rem 0;
  max-width: 100%;
  position: relative;
}

.installation-path::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 24px;
  width: 2px;
  background: linear-gradient(to bottom, transparent 0%, var(--accent) 10%, var(--accent) 90%, transparent 100%);
  opacity: 0.2;
  z-index: 1;
}

.path-step {
  display: flex;
  gap: 1.75rem;
  align-items: flex-start;
  margin-bottom: 2rem;
  position: relative;
  z-index: 2;
}
.path-step:last-child { margin-bottom: 0; }

.path-step .step-number {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  background: var(--bg-secondary);
  color: var(--accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 600;
  border: 2px solid var(--accent);
  transition: var(--transition);
  box-shadow: 0 4px 12px rgba(100, 181, 246, 0.15);
  z-index: 3;
}

.path-step .step-content {
  flex: 1;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  transition: var(--transition);
}
.path-step .step-content:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.path-step h4 { font-size: 1.2rem; margin-bottom: 0.75rem; color: var(--text-primary); font-weight: 600; }
.path-step p { color: var(--text-secondary); margin: 0 0 1rem 0; font-size: 1rem; line-height: 1.65; }
.path-step p:last-child { margin-bottom: 0; }
.path-step p strong { color: var(--accent); }

.path-connector {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 40px;
  margin: 0.5rem 0 2rem 0;
  position: relative;
  z-index: 2;
}

.path-connector::after {
  content: '↓';
  color: var(--accent);
  font-size: 1.5rem;
  font-weight: 600;
  background: var(--bg-primary);
  padding: 0 1.5rem;
  z-index: 2;
  position: relative;
  animation: pulseArrow 2s infinite cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes pulseArrow {
  0%, 100% { opacity: 1; transform: translateY(0); }
  50% { opacity: 0.7; transform: translateY(5px); }
}

.path-step:hover .step-number { background: var(--accent); color: #fff; transform: scale(1.05); box-shadow: 0 6px 20px rgba(100, 181, 246, 0.3); }

.distinction-table {
  width: 100%;
  overflow-x: auto;
  margin: 2rem auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--bg-secondary);
  max-width: var(--content-max-width);
}
.distinction-table table { width: 100%; border-collapse: collapse; }
.distinction-table th {
  text-align: left;
  padding: 1.25rem 1rem;
  background: rgba(100, 181, 246, 0.1);
  color: var(--accent);
  font-weight: 600;
  font-size: 0.95rem;
  border-bottom: 2px solid var(--border);
  border-right: 1px solid var(--border-light);
}
.distinction-table th:last-child { border-right: none; }
.distinction-table td {
  padding: 1.25rem 1rem;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-secondary);
  line-height: 1.6;
  vertical-align: top;
  border-right: 1px solid var(--border-light);
}
.distinction-table td:last-child { border-right: none; }
.distinction-table tbody tr:last-child td { border-bottom: none; }
.distinction-table tbody tr:nth-child(even) { background: rgba(100, 181, 246, 0.02); }
.distinction-table tbody tr:hover { background: rgba(100, 181, 246, 0.05); }
.distinction-table td:first-child { font-weight: 500; color: var(--text-primary); white-space: nowrap; }

.characteristics, .comparison {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}
.characteristic, .comparison-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  padding: 1.5rem;
  border-radius: var(--radius-md);
  transition: var(--transition);
}
.characteristic:hover, .comparison-item:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.characteristic h4, .comparison-item h4 { color: var(--accent); margin-bottom: 0.75rem; font-size: 1.1rem; }

.pillar-practices {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1rem 0;
}
.pillar-practices span {
  background: rgba(100, 181, 246, 0.08);
  padding: 0.2rem 0.6rem;
  border-radius: 16px;
  font-size: 0.85rem;
  color: var(--text-tertiary);
  border: 1px solid rgba(100, 181, 246, 0.15);
}
.sep { background: transparent !important; padding: 0.2rem 0 !important; color: var(--text-tertiary); border: none !important; }

.pillars { margin: 4rem auto; max-width: var(--content-max-width); }
.section-title { font-size: 1.8rem; font-weight: 600; text-align: center; margin-bottom: 3rem; color: var(--text-primary); letter-spacing: -0.5px; }
.pillar {
  display: flex;
  gap: 2rem;
  margin-bottom: 3rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 2rem;
  transition: var(--transition);
}
.pillar:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.pillar-marker {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  background: var(--accent);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  font-weight: 600;
  box-shadow: 0 4px 12px rgba(100, 181, 246, 0.3);
}
.pillar-content { flex: 1; }
.pillar-title { font-size: 1.8rem; font-weight: 600; margin-bottom: 0.5rem; color: var(--text-primary); }
.pillar-title.accent { color: var(--accent); }
.pillar-subtitle { font-size: 1rem; margin-bottom: 1rem; color: var(--text-tertiary); }
.pillar-subtitle strong { color: var(--accent); font-weight: 600; }
.pillar-threshold {
  font-size: 0.95rem;
  padding: 1rem;
  background: rgba(100, 181, 246, 0.05);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-top: 1rem;
}
.threshold-label { font-weight: 600; color: var(--accent); text-transform: uppercase; font-size: 0.8rem; letter-spacing: 0.5px; margin-right: 0.5rem; }

.threshold {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  margin: 3rem 0;
  max-width: var(--content-max-width);
  margin-left: auto;
  margin-right: auto;
}
.threshold-line { flex: 1; height: 1px; background: linear-gradient(90deg, transparent, var(--border), transparent); }
.threshold-words {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 0 1rem;
}
.threshold-word { transition: var(--transition); }
.threshold-word:hover { color: var(--accent); }
.threshold-word.accent { color: var(--accent); }
.threshold-divider { color: var(--text-tertiary); font-weight: 300; }

.ground {
  text-align: center;
  max-width: var(--content-max-width);
  margin: 3rem auto;
  padding: 2rem;
  background: rgba(100, 181, 246, 0.05);
  border-radius: var(--radius-md);
  border: 1px solid rgba(100, 181, 246, 0.1);
}
.ground p { font-size: 1.2rem; color: var(--text-primary); margin: 0; line-height: 1.6; }

.counterfeit {
  margin: 4rem auto;
  max-width: var(--content-max-width);
  padding: 2rem;
  background: rgba(255, 107, 107, 0.03);
  border: 1px solid rgba(255, 107, 107, 0.15);
  border-radius: var(--radius-md);
  text-align: center;
}
.counterfeit-intro { text-align: center; margin-bottom: 2rem; color: var(--text-secondary); font-size: 1.1rem; }
.counterfeit-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
  justify-content: center;
}
.counterfeit-card {
  background: var(--bg-tertiary);
  padding: 1.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  text-align: center;
  transition: var(--transition);
}
.counterfeit-card:hover { border-color: var(--counterfeit); transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.counterfeit-card h4 { color: var(--counterfeit); margin-bottom: 1rem; font-size: 1.1rem; }
.counterfeit-real { color: var(--text-primary); font-size: 0.95rem; margin-bottom: 0.5rem; padding-bottom: 0.5rem; border-bottom: 1px solid var(--border); }
.counterfeit-fake { color: var(--counterfeit); font-size: 0.9rem; opacity: 0.9; }
.counterfeit-practice {
  background: rgba(0, 0, 0, 0.2);
  padding: 1.5rem;
  border-radius: var(--radius-sm);
  margin-top: 1rem;
  text-align: left;
  max-width: var(--content-max-width);
  margin-left: auto;
  margin-right: auto;
}
.counterfeit-practice strong { color: var(--counterfeit); }
.counterfeit-link { margin: 0; text-align: right; }

.sequence { margin: 4rem auto; max-width: var(--content-max-width); text-align: center; }
.sequence-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 2rem;
  text-align: center;
  transition: var(--transition);
}
.sequence-box:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.sequence-title { color: var(--accent); margin-bottom: 1rem; }
.sequence-steps {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin: 2rem 0;
  flex-wrap: wrap;
}
.sequence-step { display: flex; align-items: center; gap: 0.5rem; }
.step-num {
  width: 30px;
  height: 30px;
  background: var(--accent);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 600;
}
.step-name { color: var(--text-primary); font-size: 0.95rem; }
.step-arrow { color: var(--text-tertiary); margin-left: 0.5rem; }
.sequence-warning {
  color: var(--text-tertiary);
  font-size: 0.9rem;
  background: rgba(255, 107, 107, 0.1);
  padding: 1rem;
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--counterfeit);
  text-align: left;
}
.sequence-warning i { color: var(--counterfeit); margin-right: 0.5rem; }

.invitation { text-align: center; }
.invitation-card {
  background: linear-gradient(135deg, rgba(100, 181, 246, 0.1), rgba(74, 144, 226, 0.1));
  border: 1px solid var(--accent);
  border-radius: var(--radius-lg);
  padding: 3rem 2rem;
  text-align: center;
  margin: 2rem auto;
  max-width: var(--content-max-width);
  transition: var(--transition);
}
.invitation-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.invitation-card h2 { color: var(--accent); margin-bottom: 1rem; font-size: 2rem; }
.invitation-card p { color: var(--text-secondary); max-width: 400px; margin: 0 auto 1rem; font-size: 1.1rem; }
.invitation-card p:last-child { margin-bottom: 0; }
.invitation-card em { color: var(--accent); font-style: normal; font-weight: 500; }
.invitation-small { font-size: 0.85rem; margin-top: 1rem; }
.invitation-small a { color: var(--text-tertiary); text-decoration: underline; }
.invitation-small a:hover { color: var(--accent); }

.navigation {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 3rem 0;
  max-width: var(--content-max-width);
  margin-left: auto;
  margin-right: auto;
  width: 100%;
}

.progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: rgba(100, 181, 246, 0.1);
  z-index: 9999;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}
.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  transition: width 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

.footer {
  padding: 3rem 0 1rem;
  color: var(--text-secondary);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
  margin-top: 3rem;
  text-align: center;
  max-width: var(--content-max-width);
  margin-left: auto;
  margin-right: auto;
}
.footer-credit { font-size: 0.9rem; margin: 0.5rem 0; color: var(--text-tertiary); }

.simple-divider { height: 1px; background: var(--border); margin: 2.5rem auto; max-width: var(--content-max-width); }

@media (max-width: 1024px) {
  .sidenav { transform: translateX(-100%); width: 280px; transition: transform 0.3s ease; }
  .sidenav.open { transform: translateX(0); }
  .main { margin-left: 0; width: 100%; padding: 4rem 2rem 2rem; }
  .sidenav-toggle { display: flex; }
}

@media (max-width: 768px) {
  .main { padding: 4rem 1.5rem 2rem; }
  .hero-title { font-size: 2.5rem; }
  .hero-line { font-size: 1.1rem; }
  .pillar { flex-direction: column; gap: 1rem; padding: 1.5rem; }
  .pillar-marker { align-self: flex-start; }
  .process-step { flex-direction: column; gap: 1rem; padding: 1.5rem; }
  .process-step .step-number { align-self: flex-start; }
  .threshold-words { flex-direction: column; gap: 0.25rem; font-size: 1rem; }
  .threshold-divider { display: none; }
  .counterfeit-grid { grid-template-columns: 1fr; }
  .sequence-steps { flex-direction: column; align-items: flex-start; }
  .step-arrow { transform: rotate(90deg); margin: 0.5rem 0; }
  .navigation { flex-direction: column; gap: 1rem; }
  .navigation a { width: 100%; justify-content: center; }
  .installation-path::before { left: 24px; }
  .path-step { gap: 1rem; }
  .path-step .step-number { width: 40px; height: 40px; font-size: 1rem; }
  .path-step .step-content { padding: 1.25rem; }
  .path-step h4 { font-size: 1.1rem; }
  .characteristics { grid-template-columns: 1fr; }
  .comparison { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .main { padding: 4rem 1rem 2rem; }
  .hero-title { font-size: 2rem; }
  .hero-eyebrow { font-size: 0.75rem; }
  .card { padding: 2rem 1rem; }
  .card p { font-size: 1rem; }
  .invitation-card { padding: 2rem 1rem; }
  .invitation-card h2 { font-size: 1.5rem; }
  .button { width: 100%; justify-content: center; }
  .installation-path::before { display: none; }
  .path-step { flex-direction: column; align-items: center; text-align: center; gap: 1rem; }
  .path-step .step-content { text-align: center; width: 100%; }
  .path-step h4 { text-align: center; }
  .pillar-practices { justify-content: center; }
  }