/* ============================================================
   OT ACADEMY — DESIGN SYSTEM
   Dark Industrial / OT SOC Aesthetic
   Fonts: Syne (display) + JetBrains Mono (code/data) + Inter (body)
   Palette: Deep black + electric green + cyan + amber warnings
   ============================================================ */

:root {
  /* Core Colors */
  --bg-base:        #080C0F;
  --bg-surface:     #0D1117;
  --bg-elevated:    #111820;
  --bg-card:        #131C24;
  --bg-card-hover:  #172030;
  --bg-border:      #1E2D3D;
  --bg-border-light:#243447;

  /* Accent Colors */
  --green:          #00FF88;
  --green-dim:      #00CC6A;
  --green-glow:     rgba(0, 255, 136, 0.15);
  --cyan:           #00CFFF;
  --cyan-dim:       #009FCC;
  --cyan-glow:      rgba(0, 207, 255, 0.12);
  --amber:          #FFB020;
  --amber-dim:      #CC8A00;
  --red:            #FF4444;
  --red-dim:        #CC2222;
  --purple:         #8B5CF6;

  /* Text */
  --text-primary:   #E8F0F8;
  --text-secondary: #8BA3BC;
  --text-muted:     #4A6070;
  --text-code:      #00FF88;

  /* Typography */
  --font-display:   'Syne', sans-serif;
  --font-mono:      'JetBrains Mono', monospace;
  --font-body:      'Inter', sans-serif;

  /* Spacing */
  --space-xs:  4px;
  --space-sm:  8px;
  --space-md:  16px;
  --space-lg:  24px;
  --space-xl:  40px;
  --space-2xl: 64px;
  --space-3xl: 96px;

  /* Radius */
  --radius-sm:  4px;
  --radius-md:  8px;
  --radius-lg:  12px;
  --radius-xl:  16px;

  /* Transitions */
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================================
   RESET & BASE
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
  background: var(--bg-base);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

/* ============================================================
   GRID OVERLAY
   ============================================================ */
.grid-overlay {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 207, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 207, 255, 0.025) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

/* ============================================================
   NAVIGATION
   ============================================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(8, 12, 15, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--bg-border);
  transition: var(--transition);
}

.nav-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
  height: 64px;
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.logo-icon { display: flex; align-items: center; }

.logo-text {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--text-primary);
}

.logo-accent { color: var(--green); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
}

.nav-link {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  white-space: nowrap;
}

.nav-link:hover {
  color: var(--text-primary);
  background: var(--bg-elevated);
}

.nav-link.active {
  color: var(--green);
  background: var(--green-glow);
}

.nav-actions { display: flex; align-items: center; gap: var(--space-md); margin-left: auto; }

.btn-nav-dash {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--bg-base);
  background: var(--green);
  padding: 7px 16px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  white-space: nowrap;
}

.btn-nav-dash:hover { background: var(--green-dim); transform: translateY(-1px); }

.nav-mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
}

.nav-mobile-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-secondary);
  border-radius: 2px;
  transition: var(--transition);
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  color: var(--bg-base);
  background: var(--green);
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  letter-spacing: 0.3px;
}

.btn-primary:hover {
  background: var(--green-dim);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--green-glow);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  background: transparent;
  border: 1px solid var(--bg-border-light);
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.btn-secondary:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  background: var(--cyan-glow);
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: var(--space-2xl);
  max-width: 1400px;
  margin: 0 auto;
  padding: 120px var(--space-xl) var(--space-3xl);
  overflow: hidden;
}

.hero-bg-elements {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.hero-ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid;
  opacity: 0.06;
}

.hero-ring-1 {
  width: 600px; height: 600px;
  top: -100px; right: -100px;
  border-color: var(--green);
  animation: ring-pulse 8s ease-in-out infinite;
}

.hero-ring-2 {
  width: 900px; height: 900px;
  top: -250px; right: -250px;
  border-color: var(--cyan);
  animation: ring-pulse 8s ease-in-out infinite 2s;
}

.hero-ring-3 {
  width: 1200px; height: 1200px;
  top: -400px; right: -400px;
  border-color: var(--green);
  animation: ring-pulse 8s ease-in-out infinite 4s;
}

@keyframes ring-pulse {
  0%, 100% { opacity: 0.04; transform: scale(1); }
  50% { opacity: 0.08; transform: scale(1.02); }
}

.hero-scan-line {
  position: absolute;
  left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--green), transparent);
  opacity: 0.3;
  animation: scan 6s linear infinite;
}

@keyframes scan {
  0% { top: 0; }
  100% { top: 100%; }
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  color: var(--green);
  background: var(--green-glow);
  border: 1px solid rgba(0, 255, 136, 0.2);
  padding: 6px 14px;
  border-radius: 100px;
  margin-bottom: var(--space-lg);
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.badge-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--green);
  animation: blink 2s ease-in-out infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(48px, 6vw, 80px);
  font-weight: 800;
  line-height: 1.0;
  letter-spacing: -2px;
  color: var(--text-primary);
  margin-bottom: var(--space-lg);
}

.title-highlight {
  color: var(--green);
  position: relative;
}

.hero-subtitle {
  font-size: 17px;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 520px;
  margin-bottom: var(--space-xl);
}

.hero-stats {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
  padding: var(--space-lg) var(--space-xl);
  background: var(--bg-surface);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-lg);
  width: fit-content;
}

.stat-item { text-align: center; }

.stat-num {
  display: block;
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 800;
  color: var(--green);
  line-height: 1;
}

.stat-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-top: 4px;
}

.stat-divider {
  width: 1px;
  height: 36px;
  background: var(--bg-border-light);
}

.hero-cta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

/* ============================================================
   PURDUE DIAGRAM (Hero Visual)
   ============================================================ */
.hero-visual {
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: center;
}

.purdue-diagram {
  background: var(--bg-surface);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  width: 100%;
  max-width: 420px;
  position: relative;
  overflow: hidden;
}

.purdue-diagram::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--green), var(--cyan));
}

.purdue-title {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: var(--space-lg);
}

.purdue-levels {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.purdue-level {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: 10px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--bg-border);
  transition: var(--transition);
}

.purdue-level:hover { border-color: var(--bg-border-light); background: var(--bg-elevated); }

.level-enterprise { border-color: rgba(0, 207, 255, 0.2); background: rgba(0, 207, 255, 0.04); }
.level-supervisory { border-color: rgba(0, 255, 136, 0.15); background: rgba(0, 255, 136, 0.03); }
.level-control { border-color: rgba(0, 255, 136, 0.2); background: rgba(0, 255, 136, 0.05); }
.level-basic { border-color: rgba(255, 176, 32, 0.15); background: rgba(255, 176, 32, 0.03); }
.level-field { border-color: rgba(255, 176, 32, 0.2); background: rgba(255, 176, 32, 0.05); }

.level-num {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  width: 28px;
  flex-shrink: 0;
}

.level-name {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  flex: 1;
}

.level-nodes {
  display: flex;
  gap: 5px;
}

.node-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--bg-border-light);
  transition: var(--transition);
}

.node-dot.active {
  background: var(--green);
  box-shadow: 0 0 6px var(--green);
  animation: node-pulse 2s ease-in-out infinite;
}

@keyframes node-pulse {
  0%, 100% { box-shadow: 0 0 4px var(--green); }
  50% { box-shadow: 0 0 10px var(--green), 0 0 20px rgba(0,255,136,0.3); }
}

.purdue-dmz {
  padding: 8px 14px;
  background: rgba(255, 68, 68, 0.06);
  border: 1px dashed rgba(255, 68, 68, 0.3);
  border-radius: var(--radius-md);
  margin: 2px 0;
}

.dmz-label {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--red);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  display: block;
  margin-bottom: 6px;
}

.dmz-icons {
  display: flex;
  gap: 8px;
}

.dmz-icon {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  color: var(--red-dim);
  background: rgba(255, 68, 68, 0.1);
  border: 1px solid rgba(255, 68, 68, 0.2);
  padding: 3px 8px;
  border-radius: var(--radius-sm);
}

.purdue-threat-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--bg-border);
}

.threat-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--red);
  animation: blink 1s ease-in-out infinite;
}

.threat-text {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--red);
  text-transform: uppercase;
  letter-spacing: 0.8px;
}

/* ============================================================
   SECTIONS
   ============================================================ */
.section {
  position: relative;
  z-index: 1;
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--space-3xl) var(--space-xl);
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.section-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--cyan);
  background: var(--cyan-glow);
  border: 1px solid rgba(0, 207, 255, 0.2);
  padding: 5px 14px;
  border-radius: 100px;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: var(--space-md);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(32px, 4vw, 48px);
  font-weight: 800;
  letter-spacing: -1.5px;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
  line-height: 1.1;
}

.section-desc {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ============================================================
   DOMAIN CARDS
   ============================================================ */
.domains-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-md);
}

.domain-card {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-lg);
  background: var(--bg-card);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-lg);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.domain-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--green), transparent);
  opacity: 0;
  transition: var(--transition);
}

.domain-card:hover {
  border-color: var(--bg-border-light);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.domain-card:hover::before { opacity: 1; }

.domain-card--featured {
  grid-column: span 2;
  background: linear-gradient(135deg, var(--bg-card), rgba(0, 255, 136, 0.04));
  border-color: rgba(0, 255, 136, 0.2);
}

.domain-icon {
  width: 48px; height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-elevated);
  border: 1px solid var(--bg-border-light);
  border-radius: var(--radius-md);
  color: var(--green);
  flex-shrink: 0;
  transition: var(--transition);
}

.domain-card:hover .domain-icon {
  background: var(--green-glow);
  border-color: rgba(0, 255, 136, 0.3);
}

.domain-content { flex: 1; }

.domain-content h3 {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.domain-content p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: var(--space-sm);
}

.domain-meta {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.meta-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  color: var(--cyan);
  background: var(--cyan-glow);
  border: 1px solid rgba(0, 207, 255, 0.15);
  padding: 2px 8px;
  border-radius: 100px;
}

.domain-arrow {
  font-size: 18px;
  color: var(--text-muted);
  transition: var(--transition);
  align-self: center;
}

.domain-card:hover .domain-arrow {
  color: var(--green);
  transform: translateX(4px);
}

/* ============================================================
   LEARNING PATHS
   ============================================================ */
.paths-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.path-card {
  padding: var(--space-xl);
  background: var(--bg-card);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-xl);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.path-card::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 3px;
  border-radius: 0 0 var(--radius-xl) var(--radius-xl);
}

.path-beginner::after { background: var(--cyan); }
.path-soc::after { background: var(--green); }
.path-architect::after { background: var(--purple); }
.path-manager::after { background: var(--amber); }

.path-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.5);
  border-color: var(--bg-border-light);
}

.path-level {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: var(--space-sm);
}

.path-beginner .path-level { color: var(--cyan); }
.path-soc .path-level { color: var(--green); }
.path-architect .path-level { color: var(--purple); }
.path-manager .path-level { color: var(--amber); }

.path-card h3 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
  letter-spacing: -0.5px;
}

.path-card p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-md);
}

.path-modules {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: var(--space-md);
}

.path-modules span {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-muted);
  background: var(--bg-elevated);
  border: 1px solid var(--bg-border);
  padding: 3px 8px;
  border-radius: var(--radius-sm);
}

.path-duration {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  margin-bottom: var(--space-md);
}

.path-cta {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  color: var(--green);
  transition: var(--transition);
}

.path-cta:hover { letter-spacing: 0.5px; }

.paths-cta-row { text-align: center; }

/* ============================================================
   TICKER
   ============================================================ */
.ticker-section {
  position: relative;
  z-index: 1;
  background: var(--bg-surface);
  border-top: 1px solid var(--bg-border);
  border-bottom: 1px solid var(--bg-border);
  padding: 14px 0;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.ticker-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  color: var(--red);
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: 0 var(--space-xl);
  white-space: nowrap;
  flex-shrink: 0;
  border-right: 1px solid var(--bg-border);
  margin-right: var(--space-xl);
}

.ticker-track {
  flex: 1;
  overflow: hidden;
}

.ticker-content {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
  white-space: nowrap;
  animation: ticker-scroll 60s linear infinite;
}

@keyframes ticker-scroll {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

.ticker-item {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  white-space: nowrap;
}

.ticker-threat {
  color: var(--red);
  font-weight: 600;
}

.ticker-sep {
  color: var(--bg-border-light);
  font-size: 8px;
}

/* ============================================================
   EXAM PREVIEW
   ============================================================ */
.exam-preview-section {
  background: var(--bg-surface);
  border-top: 1px solid var(--bg-border);
  border-bottom: 1px solid var(--bg-border);
  max-width: 100%;
  padding: var(--space-3xl) var(--space-xl);
}

.exam-preview-inner {
  max-width: 1400px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
}

.exam-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin: var(--space-lg) 0 var(--space-xl);
}

.exam-features li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
  color: var(--text-secondary);
}

.exam-features li svg { flex-shrink: 0; margin-top: 2px; }

/* Sample Question Card */
.sample-question {
  background: var(--bg-card);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  position: relative;
  overflow: hidden;
}

.sample-question::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--green), var(--cyan));
}

.sq-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
  flex-wrap: wrap;
}

.sq-badge {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 100px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.sq-badge--intermediate {
  color: var(--amber);
  background: rgba(255, 176, 32, 0.1);
  border: 1px solid rgba(255, 176, 32, 0.2);
}

.sq-module {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--cyan);
  background: var(--cyan-glow);
  border: 1px solid rgba(0, 207, 255, 0.15);
  padding: 3px 10px;
  border-radius: 100px;
}

.sq-num {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-muted);
  margin-left: auto;
}

.sq-question {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.6;
  margin-bottom: var(--space-lg);
}

.sq-options {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: var(--space-md);
}

.sq-option {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 14px;
  background: var(--bg-elevated);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition);
  font-size: 13px;
  color: var(--text-secondary);
}

.sq-option:hover {
  border-color: var(--bg-border-light);
  color: var(--text-primary);
}

.sq-option--correct {
  border-color: rgba(0, 255, 136, 0.3);
  background: rgba(0, 255, 136, 0.06);
  color: var(--text-primary);
}

.opt-letter {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--text-muted);
  width: 18px;
  flex-shrink: 0;
  margin-top: 1px;
}

.sq-option--correct .opt-letter { color: var(--green); }

.sq-explanation {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: var(--space-md);
  background: rgba(0, 255, 136, 0.04);
  border: 1px solid rgba(0, 255, 136, 0.15);
  border-radius: var(--radius-md);
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.sq-explanation svg { flex-shrink: 0; margin-top: 2px; }

/* ============================================================
   AI SECTION
   ============================================================ */
.ai-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-md);
}

.ai-card {
  padding: var(--space-xl);
  background: var(--bg-card);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-lg);
  transition: var(--transition);
}

.ai-card:hover {
  border-color: var(--bg-border-light);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.ai-icon {
  width: 44px; height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  margin-bottom: var(--space-md);
}

.ai-icon--tutor { background: rgba(0, 255, 136, 0.1); color: var(--green); border: 1px solid rgba(0, 255, 136, 0.2); }
.ai-icon--exam { background: rgba(0, 207, 255, 0.1); color: var(--cyan); border: 1px solid rgba(0, 207, 255, 0.2); }
.ai-icon--risk { background: rgba(255, 68, 68, 0.1); color: var(--red); border: 1px solid rgba(255, 68, 68, 0.2); }
.ai-icon--ir { background: rgba(255, 176, 32, 0.1); color: var(--amber); border: 1px solid rgba(255, 176, 32, 0.2); }
.ai-icon--policy { background: rgba(139, 92, 246, 0.1); color: var(--purple); border: 1px solid rgba(139, 92, 246, 0.2); }
.ai-icon--arch { background: rgba(0, 255, 136, 0.1); color: var(--green); border: 1px solid rgba(0, 255, 136, 0.2); }

.ai-card h3 {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.ai-card p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ============================================================
   STANDARDS
   ============================================================ */
.standards-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  justify-content: center;
}

.standard-badge {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: var(--space-md) var(--space-xl);
  background: var(--bg-card);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-lg);
  transition: var(--transition);
  min-width: 140px;
}

.standard-badge:hover {
  border-color: rgba(0, 255, 136, 0.3);
  background: var(--green-glow);
}

.std-name {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
}

.std-desc {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ============================================================
   INDUSTRIES
   ============================================================ */
.industries-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  justify-content: center;
}

.industry-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 20px;
  background: var(--bg-card);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-lg);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition);
}

.industry-item:hover {
  border-color: var(--bg-border-light);
  color: var(--text-primary);
  transform: translateY(-2px);
}

.ind-icon { font-size: 20px; }

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  position: relative;
  z-index: 1;
  background: var(--bg-surface);
  border-top: 1px solid var(--bg-border);
  padding: var(--space-3xl) var(--space-xl) var(--space-xl);
}

.footer-inner {
  max-width: 1400px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--space-3xl);
  margin-bottom: var(--space-2xl);
}

.footer-brand p {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-top: var(--space-md);
  max-width: 280px;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

.footer-col h4 {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.footer-col a {
  display: block;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 8px;
  transition: var(--transition);
}

.footer-col a:hover { color: var(--green); }

.footer-bottom {
  max-width: 1400px;
  margin: 0 auto;
  padding-top: var(--space-lg);
  border-top: 1px solid var(--bg-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
}

/* ============================================================
   PAGE HEADER (reusable for inner pages)
   ============================================================ */
.page-header {
  padding: 120px var(--space-xl) var(--space-2xl);
  max-width: 1400px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.page-header-inner {
  max-width: 800px;
}

.page-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  margin-bottom: var(--space-lg);
}

.page-breadcrumb a { color: var(--text-muted); transition: var(--transition); }
.page-breadcrumb a:hover { color: var(--green); }
.page-breadcrumb span { color: var(--bg-border-light); }

.page-title {
  font-family: var(--font-display);
  font-size: clamp(36px, 5vw, 64px);
  font-weight: 800;
  letter-spacing: -2px;
  color: var(--text-primary);
  line-height: 1.05;
  margin-bottom: var(--space-md);
}

.page-subtitle {
  font-size: 17px;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 600px;
}

/* ============================================================
   TABS
   ============================================================ */
.tabs {
  display: flex;
  gap: 4px;
  background: var(--bg-surface);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-lg);
  padding: 4px;
  width: fit-content;
}

.tab-btn {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  padding: 8px 18px;
  border-radius: var(--radius-md);
  transition: var(--transition);
  cursor: pointer;
  border: none;
  background: none;
}

.tab-btn:hover { color: var(--text-primary); background: var(--bg-elevated); }

.tab-btn.active {
  color: var(--bg-base);
  background: var(--green);
  font-weight: 600;
}

.tab-content { display: none; }
.tab-content.active { display: block; }

/* ============================================================
   PROGRESS BARS
   ============================================================ */
.progress-bar {
  height: 4px;
  background: var(--bg-border);
  border-radius: 100px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--green), var(--cyan));
  border-radius: 100px;
  transition: width 1s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================================
   BADGES / CHIPS
   ============================================================ */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 100px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge--green { color: var(--green); background: var(--green-glow); border: 1px solid rgba(0,255,136,0.2); }
.badge--cyan { color: var(--cyan); background: var(--cyan-glow); border: 1px solid rgba(0,207,255,0.2); }
.badge--amber { color: var(--amber); background: rgba(255,176,32,0.1); border: 1px solid rgba(255,176,32,0.2); }
.badge--red { color: var(--red); background: rgba(255,68,68,0.1); border: 1px solid rgba(255,68,68,0.2); }
.badge--purple { color: var(--purple); background: rgba(139,92,246,0.1); border: 1px solid rgba(139,92,246,0.2); }

/* ============================================================
   MODULE CARDS (curriculum page)
   ============================================================ */
.module-card {
  background: var(--bg-card);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: var(--transition);
  cursor: pointer;
}

.module-card:hover {
  border-color: var(--bg-border-light);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(0,0,0,0.3);
}

.module-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.module-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
}

.module-title {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.module-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: var(--space-md);
}

.module-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
}

/* ============================================================
   SOC DASHBOARD ELEMENTS
   ============================================================ */
.soc-metric {
  background: var(--bg-card);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
}

.soc-metric-value {
  font-family: var(--font-display);
  font-size: 36px;
  font-weight: 800;
  color: var(--green);
  line-height: 1;
  margin-bottom: 4px;
}

.soc-metric-label {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.8px;
}

/* Alert items */
.alert-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-md);
  background: var(--bg-elevated);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-md);
  border-left: 3px solid;
  transition: var(--transition);
}

.alert-item:hover { background: var(--bg-card); }
.alert-item--critical { border-left-color: var(--red); }
.alert-item--high { border-left-color: var(--amber); }
.alert-item--medium { border-left-color: var(--cyan); }
.alert-item--low { border-left-color: var(--green); }

.alert-severity {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.alert-item--critical .alert-severity { color: var(--red); background: rgba(255,68,68,0.1); }
.alert-item--high .alert-severity { color: var(--amber); background: rgba(255,176,32,0.1); }
.alert-item--medium .alert-severity { color: var(--cyan); background: var(--cyan-glow); }
.alert-item--low .alert-severity { color: var(--green); background: var(--green-glow); }

/* ============================================================
   PROTOCOL CARDS
   ============================================================ */
.protocol-card {
  background: var(--bg-card);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: var(--transition);
  cursor: pointer;
}

.protocol-card:hover {
  border-color: rgba(0, 207, 255, 0.3);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}

.protocol-name {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 4px;
  letter-spacing: -0.5px;
}

.protocol-port {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--cyan);
  margin-bottom: var(--space-md);
}

.protocol-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: var(--space-md);
}

.protocol-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

/* ============================================================
   IEC 62443 SPECIFIC
   ============================================================ */
.iec-part-card {
  background: var(--bg-card);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.iec-part-card::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--green);
}

.iec-part-card:hover {
  border-color: rgba(0, 255, 136, 0.2);
  transform: translateX(4px);
}

.iec-part-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--green);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 6px;
}

.iec-part-title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}

/* ============================================================
   EXAM ENGINE
   ============================================================ */
.exam-container {
  max-width: 900px;
  margin: 0 auto;
}

.exam-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg) var(--space-xl);
  background: var(--bg-surface);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-xl);
}

.exam-timer {
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  color: var(--green);
}

.exam-timer.warning { color: var(--amber); }
.exam-timer.danger { color: var(--red); animation: blink 1s ease-in-out infinite; }

.exam-progress-text {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-muted);
}

.question-card {
  background: var(--bg-card);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  margin-bottom: var(--space-xl);
}

.question-text {
  font-size: 18px;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.6;
  margin-bottom: var(--space-xl);
}

.answer-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.answer-option {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-elevated);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition);
  font-size: 14px;
  color: var(--text-secondary);
}

.answer-option:hover {
  border-color: var(--cyan);
  color: var(--text-primary);
  background: var(--cyan-glow);
}

.answer-option.selected {
  border-color: var(--cyan);
  background: var(--cyan-glow);
  color: var(--text-primary);
}

.answer-option.correct {
  border-color: var(--green);
  background: var(--green-glow);
  color: var(--text-primary);
}

.answer-option.incorrect {
  border-color: var(--red);
  background: rgba(255,68,68,0.08);
  color: var(--text-primary);
}

.option-key {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-border);
  border-radius: var(--radius-sm);
  flex-shrink: 0;
  color: var(--text-muted);
}

.answer-option.selected .option-key { background: var(--cyan); color: var(--bg-base); }
.answer-option.correct .option-key { background: var(--green); color: var(--bg-base); }
.answer-option.incorrect .option-key { background: var(--red); color: white; }

/* ============================================================
   DASHBOARD
   ============================================================ */
.dashboard-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: var(--space-xl);
  min-height: calc(100vh - 64px);
  padding-top: 64px;
}

.dashboard-sidebar {
  background: var(--bg-surface);
  border-right: 1px solid var(--bg-border);
  padding: var(--space-xl);
  position: sticky;
  top: 64px;
  height: calc(100vh - 64px);
  overflow-y: auto;
}

.dashboard-main {
  padding: var(--space-xl);
  overflow-y: auto;
}

.learner-profile {
  text-align: center;
  padding: var(--space-xl) 0;
  border-bottom: 1px solid var(--bg-border);
  margin-bottom: var(--space-xl);
}

.learner-avatar {
  width: 64px; height: 64px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--green), var(--cyan));
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 800;
  color: var(--bg-base);
  margin: 0 auto var(--space-md);
}

.learner-name {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.learner-role {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--green);
  text-transform: uppercase;
  letter-spacing: 0.8px;
}

.xp-bar-container {
  margin-top: var(--space-md);
}

.xp-label {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-muted);
  margin-bottom: 6px;
}

/* ============================================================
   LABS
   ============================================================ */
.lab-card {
  background: var(--bg-card);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: var(--transition);
}

.lab-card:hover {
  border-color: var(--bg-border-light);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}

.lab-header {
  padding: var(--space-lg);
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--bg-border);
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.lab-icon {
  width: 40px; height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-card);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-md);
  font-size: 18px;
}

.lab-title {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
}

.lab-body { padding: var(--space-lg); }

.lab-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-md);
}

.lab-meta {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
  margin-bottom: var(--space-md);
}

.lab-footer {
  padding: var(--space-md) var(--space-lg);
  border-top: 1px solid var(--bg-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.lab-difficulty {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.lab-difficulty--beginner { color: var(--green); }
.lab-difficulty--intermediate { color: var(--amber); }
.lab-difficulty--advanced { color: var(--red); }

.btn-launch-lab {
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 700;
  color: var(--bg-base);
  background: var(--green);
  padding: 6px 16px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.btn-launch-lab:hover { background: var(--green-dim); }

/* ============================================================
   SCROLLBAR
   ============================================================ */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-base); }
::-webkit-scrollbar-thumb { background: var(--bg-border-light); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ============================================================
   ANIMATIONS
   ============================================================ */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

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

.animate-in {
  animation: fadeInUp 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1200px) {
  .hero { grid-template-columns: 1fr; padding-top: 100px; }
  .hero-visual { display: none; }
  .domain-card--featured { grid-column: span 1; }
  .exam-preview-inner { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; }
}

@media (max-width: 900px) {
  .nav-links { display: none; }
  .nav-mobile-toggle { display: flex; }
  .nav-inner { padding: 0 var(--space-lg); }
  .section { padding: var(--space-2xl) var(--space-lg); }
  .hero { padding: 100px var(--space-lg) var(--space-2xl); }
  .hero-stats { flex-wrap: wrap; gap: var(--space-md); }
  .paths-grid { grid-template-columns: 1fr; }
  .footer-links { grid-template-columns: 1fr 1fr; }
  .dashboard-grid { grid-template-columns: 1fr; }
  .dashboard-sidebar { position: static; height: auto; }
}

@media (max-width: 600px) {
  .hero-title { font-size: 40px; letter-spacing: -1px; }
  .section-title { font-size: 28px; }
  .domains-grid { grid-template-columns: 1fr; }
  .hero-cta { flex-direction: column; align-items: flex-start; }
  .footer-links { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: var(--space-sm); text-align: center; }
}