/* ==========================================================================
   Industrial Titanium & Safety Orange Stylesheet
   Hardware Lab / Teenage Engineering / Precision Systems Aesthetic
   ========================================================================== */

:root {
  /* Dark Matte Titanium Slate */
  --bg-primary: #0e1013;
  --bg-secondary: #14161b;
  --bg-card: #181b22;
  --bg-card-hover: #21252f;
  --border-color: #272a34;
  --border-highlight: #ff5500;
  --border-subtle: #1c1f26;
  
  --text-primary: #f5f5f2;
  --text-secondary: #9da3af;
  --text-muted: #646a78;
  
  /* Electric Safety Orange & Hardware Lab Accents */
  --accent-orange: #ff5500;
  --accent-orange-bright: #ff6a1a;
  --accent-orange-glow: rgba(255, 85, 0, 0.28);
  --accent-cyan: #ff5500; /* Unified to punchy orange for maximum distinction */
  --accent-blue: #ff7722;
  --accent-amber: #f59e0b;
  --accent-green: #10b981;
  --accent-purple: #e05520;
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Inter", Oxygen, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", "Fira Code", "Cascadia Code", Consolas, Menlo, Monaco, monospace;
  
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.6);
  --shadow-md: 0 4px 12px -2px rgba(0, 0, 0, 0.7), 0 2px 4px -2px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 14px 32px -6px rgba(0, 0, 0, 0.85), 0 8px 12px -6px rgba(0, 0, 0, 0.7);
  
  --transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="light"] {
  /* Industrial Drafting Blueprint Aesthetic */
  --bg-primary: #f5f5f1;
  --bg-secondary: #eaeae3;
  --bg-card: #ffffff;
  --bg-card-hover: #fafaf7;
  --border-color: #d6d7ce;
  --border-highlight: #ff5500;
  --border-subtle: #e3e4dc;
  
  --text-primary: #121316;
  --text-secondary: #494d57;
  --text-muted: #7d8290;
  
  --accent-orange: #ff5500;
  --accent-orange-bright: #e64c00;
  --accent-orange-glow: rgba(255, 85, 0, 0.15);
  --accent-cyan: #ff5500;
  --accent-blue: #e64c00;
  
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 10px -1px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 12px 20px -3px rgba(0, 0, 0, 0.08);
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  background-image: radial-gradient(rgba(255, 85, 0, 0.035) 1px, transparent 1px);
  background-size: 24px 24px;
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color 0.3s ease, color 0.3s ease;
}

[data-theme="light"] body {
  background-image: radial-gradient(rgba(0, 0, 0, 0.04) 1px, transparent 1px);
}

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

a:hover {
  color: var(--accent-orange-bright);
  text-decoration: underline;
}

/* Header & Navigation */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(14, 16, 19, 0.88);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-color);
}

[data-theme="light"] header {
  background-color: rgba(245, 245, 241, 0.90);
}

.nav-container {
  max-width: 1150px;
  margin: 0 auto;
  padding: 0.9rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.02rem;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.brand:hover {
  text-decoration: none;
  color: var(--accent-orange);
}

.brand-dot {
  width: 9px;
  height: 9px;
  background-color: var(--accent-orange);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--accent-orange);
  animation: pulse-orange 2.8s infinite ease-in-out;
}

@keyframes pulse-orange {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
    box-shadow: 0 0 10px var(--accent-orange);
  }
  50% {
    opacity: 0.6;
    transform: scale(0.9);
    box-shadow: 0 0 4px var(--accent-orange);
  }
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.92rem;
  font-weight: 500;
  padding: 0.4rem 0.65rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
  background-color: var(--bg-card);
  text-decoration: none;
}

.nav-links a.active {
  border-bottom: 2px solid var(--accent-orange);
}

.theme-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.88rem;
  font-family: var(--font-mono);
  transition: var(--transition);
}

.theme-btn:hover {
  border-color: var(--accent-orange);
  color: var(--accent-orange);
}

/* Main Container */
main {
  flex: 1;
  max-width: 1150px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
  width: 100%;
}

/* Terminal Hero Card */
.hero {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 2.5rem;
  align-items: center;
  margin-bottom: 3.5rem;
  padding: 2.5rem 0;
}

.hero-text h1 {
  font-size: 2.7rem;
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.15;
  margin-bottom: 0.75rem;
}

.hero-text .role-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  font-weight: 700;
  color: var(--accent-orange);
  background: rgba(255, 85, 0, 0.1);
  border: 1px solid rgba(255, 85, 0, 0.35);
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-sm);
  margin-bottom: 1.2rem;
}

.hero-text p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-bottom: 1.8rem;
  max-width: 600px;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.3rem;
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.btn-primary {
  background: linear-gradient(135deg, #ff5500, #ff7324);
  color: #ffffff;
  border: none;
  font-weight: 700;
  box-shadow: 0 4px 14px rgba(255, 85, 0, 0.32);
}

.btn-primary:hover {
  text-decoration: none;
  background: linear-gradient(135deg, #ff6614, #ff853a);
  box-shadow: 0 6px 18px rgba(255, 85, 0, 0.45);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  text-decoration: none;
  background: var(--bg-card-hover);
  border-color: var(--border-highlight);
  color: var(--accent-orange);
}

/* Terminal Window */
.terminal-window {
  background: #090a0d;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: 0 16px 36px -10px rgba(0, 0, 0, 0.85), 0 0 0 1px rgba(255, 85, 0, 0.1);
  font-family: var(--font-mono);
}

.terminal-header {
  background: #121418;
  padding: 0.65rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.term-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.term-red { background: #ff4d4d; }
.term-yellow { background: #f59e0b; }
.term-green { background: #10b981; }

.terminal-title {
  margin-left: auto;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.terminal-body {
  padding: 1.25rem 1.25rem;
  font-size: 0.86rem;
  color: #e5e5df;
}

.term-line {
  margin-bottom: 0.6rem;
}

.term-prompt {
  color: var(--accent-orange);
  font-weight: 700;
}

.term-cmd {
  color: #f5f5f2;
  font-weight: 600;
}

.term-out {
  color: #9da3af;
  padding-left: 1rem;
}

.term-highlight {
  color: var(--accent-orange);
  font-weight: 700;
  letter-spacing: 0.04em;
}

/* Metric Stats Row */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  margin-bottom: 3.5rem;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 1.5rem;
  text-align: left;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.stat-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: var(--accent-orange);
  opacity: 0.4;
  transition: var(--transition);
}

.stat-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-highlight);
}

.stat-card:hover::after {
  opacity: 1;
}

.stat-value {
  font-size: 2.3rem;
  font-weight: 800;
  font-family: var(--font-mono);
  background: linear-gradient(135deg, #ff5500, #ff9900);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1;
  margin-bottom: 0.5rem;
}

.stat-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.stat-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Section Common Styling */
.section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 1.8rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.75rem;
}

.section-title {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

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

/* Cards Grid */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(330px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.6rem;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  position: relative;
}

.card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-highlight);
  transform: translateY(-3px);
  box-shadow: 0 10px 24px -6px rgba(0, 0, 0, 0.7), 0 0 0 1px rgba(255, 85, 0, 0.15);
}

.card-tag {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  font-weight: 600;
  color: var(--accent-orange);
  background: rgba(255, 85, 0, 0.1);
  border: 1px solid rgba(255, 85, 0, 0.28);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  display: inline-block;
  margin-bottom: 0.9rem;
  align-self: flex-start;
}

.card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
  line-height: 1.3;
}

.card p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  margin-bottom: 1.25rem;
  flex: 1;
}

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

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1rem;
}

.tech-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-color);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
}

/* Code Snippet Box */
.code-box {
  background: #090a0d;
  border: 1px solid var(--border-color);
  border-left: 3px solid var(--accent-orange);
  border-radius: var(--radius-sm);
  padding: 1rem 1.2rem;
  margin: 1rem 0;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  overflow-x: auto;
  color: #e5e5df;
}

/* Resume Page Specifics */
.resume-action-bar {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 1.2rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.resume-wrapper {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 3rem 3.5rem;
  box-shadow: var(--shadow-lg);
}

.resume-header {
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 1.5rem;
  margin-bottom: 2rem;
}

.resume-name {
  font-size: 2.3rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 0.25rem;
}

.resume-title {
  font-size: 1.15rem;
  color: var(--accent-orange);
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.resume-contact {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.resume-section {
  margin-bottom: 2.2rem;
}

.resume-sec-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--accent-orange);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.4rem;
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.resume-sec-title::before {
  content: "■";
  font-size: 0.75rem;
  color: var(--accent-orange);
}

.job-block {
  margin-bottom: 1.6rem;
}

.job-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  margin-bottom: 0.2rem;
}

.job-company {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
}

.job-tenure {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.job-role {
  color: var(--text-primary);
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 0.6rem;
}

.resume-list {
  padding-left: 1.25rem;
  color: var(--text-secondary);
  font-size: 0.92rem;
}

.resume-list li {
  margin-bottom: 0.5rem;
}

.resume-list strong {
  color: var(--text-primary);
}

/* Footer */
footer {
  border-top: 1px solid var(--border-color);
  background: var(--bg-secondary);
  padding: 2rem 1.5rem;
  text-align: center;
  font-size: 0.88rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-bottom: 0.75rem;
}

/* Responsive */
@media (max-width: 850px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .resume-wrapper {
    padding: 1.8rem 1.4rem;
  }
}

/* ==========================================================================
   Git Internals & Learning Lab Interactive Styles
   ========================================================================== */

/* 4-Zone State Simulator */
.sim-container {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 2.5rem;
  box-shadow: var(--shadow-md);
}

.sim-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.sim-zones-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.sim-zone {
  background: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1rem;
  display: flex;
  flex-direction: column;
  min-height: 250px;
  position: relative;
  transition: var(--transition);
}

.sim-zone.zone-active {
  border-color: var(--accent-orange);
  box-shadow: 0 0 12px var(--accent-orange-glow);
}

.sim-zone-title {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--accent-orange);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sim-zone-path {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-bottom: 0.85rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-subtle);
}

.sim-zone-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.sim-empty-state {
  color: var(--text-muted);
  font-size: 0.78rem;
  font-family: var(--font-mono);
  font-style: italic;
  text-align: center;
  margin: auto 0;
  padding: 1rem;
  border: 1px dashed var(--border-subtle);
  border-radius: var(--radius-sm);
}

.sim-file-chip {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.55rem 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  animation: fadeIn 0.3s ease;
  transition: var(--transition);
}

.sim-file-chip:hover {
  border-color: var(--accent-orange);
  transform: translateY(-2px);
}

.chip-name {
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.chip-status {
  font-size: 0.68rem;
  padding: 0.1rem 0.4rem;
  border-radius: 3px;
  font-weight: 600;
  text-transform: uppercase;
}

.status-mod { background: rgba(245, 158, 11, 0.2); color: #fbbf24; border: 1px solid rgba(245, 158, 11, 0.4); }
.status-untracked { background: rgba(239, 68, 68, 0.2); color: #f87171; border: 1px solid rgba(239, 68, 68, 0.4); }
.status-staged { background: rgba(16, 185, 129, 0.2); color: #34d399; border: 1px solid rgba(16, 185, 129, 0.4); }
.status-commit { background: rgba(255, 85, 0, 0.2); color: #ff884d; border: 1px solid rgba(255, 85, 0, 0.4); }
.status-remote { background: rgba(59, 130, 246, 0.2); color: #60a5fa; border: 1px solid rgba(59, 130, 246, 0.4); }

.chip-hash {
  font-size: 0.7rem;
  color: var(--text-muted);
}

.sim-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  padding: 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  margin-bottom: 1.25rem;
}

.sim-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: var(--transition);
}

.sim-btn:hover:not(:disabled) {
  border-color: var(--accent-orange);
  color: var(--accent-orange);
  background: var(--bg-card-hover);
  transform: translateY(-1px);
}

.sim-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  border-color: var(--border-subtle);
}

.sim-btn.btn-accent {
  background: var(--accent-orange);
  color: #fff;
  border-color: var(--accent-orange);
  font-weight: 600;
}

.sim-btn.btn-accent:hover:not(:disabled) {
  background: var(--accent-orange-bright);
  color: #fff;
}

.sim-console {
  background: #08090b;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  font-family: var(--font-mono);
}

.sim-console-header {
  background: #111317;
  padding: 0.5rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.sim-console-body {
  padding: 0.85rem 1.1rem;
  font-size: 0.82rem;
  line-height: 1.5;
  max-height: 180px;
  overflow-y: auto;
}

.sim-log-cmd {
  color: var(--accent-orange);
  font-weight: 600;
}

.sim-log-out {
  color: #d1d5db;
  margin: 0.2rem 0 0.5rem;
}

.sim-log-hood {
  color: #10b981;
  font-size: 0.76rem;
  background: rgba(16, 185, 129, 0.08);
  padding: 0.35rem 0.6rem;
  border-left: 2px solid #10b981;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-bottom: 0.6rem;
}

/* Conflict Playground */
.conflict-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 2.5rem;
  box-shadow: var(--shadow-md);
}

.conflict-file-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 0.85rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
  flex-wrap: wrap;
  gap: 0.5rem;
}

.conflict-editor {
  background: #090a0d;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  overflow: hidden;
  margin-bottom: 1.25rem;
}

.conflict-code-view {
  padding: 1rem;
  line-height: 1.6;
}

.diff-block {
  margin: 0.3rem 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.diff-marker-head {
  background: rgba(59, 130, 246, 0.2);
  color: #60a5fa;
  padding: 0.2rem 0.6rem;
  font-size: 0.75rem;
  font-weight: 700;
  border-left: 3px solid #3b82f6;
}

.diff-content-head {
  background: rgba(59, 130, 246, 0.08);
  color: #93c5fd;
  padding: 0.3rem 0.6rem;
  border-left: 3px solid #3b82f6;
}

.diff-marker-mid {
  background: rgba(156, 163, 175, 0.2);
  color: #9ca3af;
  padding: 0.15rem 0.6rem;
  font-size: 0.72rem;
  border-left: 3px solid #9ca3af;
}

.diff-content-incoming {
  background: rgba(16, 185, 129, 0.08);
  color: #6ee7b7;
  padding: 0.3rem 0.6rem;
  border-left: 3px solid #10b981;
}

.diff-marker-incoming {
  background: rgba(16, 185, 129, 0.2);
  color: #34d399;
  padding: 0.2rem 0.6rem;
  font-size: 0.75rem;
  font-weight: 700;
  border-left: 3px solid #10b981;
}

.conflict-resolved-view {
  background: rgba(16, 185, 129, 0.06);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: var(--radius-sm);
  padding: 0.85rem;
  color: #e5e7eb;
}

.conflict-actions-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: center;
  margin-bottom: 1.25rem;
}

.conflict-flow-step {
  font-size: 0.78rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

/* Learning Topics Accordions */
.topic-accordion {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.topic-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}

.topic-item:hover {
  border-color: rgba(255, 85, 0, 0.4);
}

.topic-header {
  padding: 1.1rem 1.4rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  user-select: none;
  background: var(--bg-card);
  transition: var(--transition);
}

.topic-header:hover {
  background: var(--bg-card-hover);
}

.topic-title-group {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.topic-meta {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent-orange);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.topic-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
}

.topic-chevron {
  font-size: 1rem;
  color: var(--text-muted);
  transition: transform 0.25s ease;
}

.topic-item.open .topic-chevron {
  transform: rotate(180deg);
  color: var(--accent-orange);
}

.topic-content {
  display: none;
  padding: 0 1.4rem 1.4rem;
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-primary);
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.topic-item.open .topic-content {
  display: block;
  animation: fadeIn 0.25s ease;
}

.topic-content h4 {
  color: var(--text-primary);
  margin: 1.2rem 0 0.4rem;
  font-size: 0.98rem;
}

.topic-content ul {
  padding-left: 1.3rem;
  margin: 0.5rem 0;
}

.topic-content li {
  margin-bottom: 0.35rem;
}

/* Knowledge Check Quiz */
.quiz-wrapper {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 2.5rem;
}

.quiz-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-bottom: 1.25rem;
}

.quiz-q-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-orange);
  margin-bottom: 0.35rem;
}

.quiz-q-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  margin-bottom: 0.85rem;
}

.quiz-opt-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.7rem 0.95rem;
  text-align: left;
  font-size: 0.88rem;
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.65rem;
  transition: var(--transition);
  font-family: var(--font-sans);
}

.quiz-opt-btn:hover:not(:disabled) {
  border-color: var(--accent-orange);
  background: var(--bg-card-hover);
}

.quiz-opt-btn.opt-correct {
  background: rgba(16, 185, 129, 0.15) !important;
  border-color: #10b981 !important;
  color: #34d399 !important;
  font-weight: 600;
}

.quiz-opt-btn.opt-incorrect {
  background: rgba(239, 68, 68, 0.15) !important;
  border-color: #ef4444 !important;
  color: #f87171 !important;
}

.quiz-feedback {
  display: none;
  font-size: 0.85rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  margin-top: 0.65rem;
  line-height: 1.5;
}

.quiz-feedback.show {
  display: block;
  animation: fadeIn 0.25s ease;
}

.quiz-feedback.correct {
  background: rgba(16, 185, 129, 0.1);
  border-left: 3px solid #10b981;
  color: #d1fae5;
}

.quiz-feedback.incorrect {
  background: rgba(239, 68, 68, 0.1);
  border-left: 3px solid #ef4444;
  color: #fee2e2;
}

/* Internals Architecture Cards */
.arch-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.2rem;
  margin-bottom: 2.5rem;
}

.arch-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  transition: var(--transition);
}

.arch-card:hover {
  border-color: var(--accent-orange);
  transform: translateY(-2px);
}

.arch-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--accent-orange);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.arch-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}

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

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Responsive tweaks for new elements */
@media (max-width: 900px) {
  .sim-zones-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .sim-zones-grid {
    grid-template-columns: 1fr;
  }
}