:root,
[data-theme="dark"] {
  --bg-primary: #0b0e14;
  --bg-secondary: #111621;
  --bg-elevated: #171e2c;
  --bg-glass: rgba(17, 22, 33, 0.82);
  --border-subtle: rgba(255, 255, 255, 0.09);
  --border-accent: rgba(249, 115, 22, 0.45);
  --text-primary: #f3f6fc;
  --text-secondary: #9ba7b8;
  --text-muted: #647287;
  --accent-primary: #f97316;
  --accent-secondary: #fb923c;
  --accent-glow: rgba(249, 115, 22, 0.22);
  --success: #22c55e;
  --danger: #ef4444;
  --code-bg: #070a0f;
  --shadow-lg: 0 24px 60px rgba(0, 0, 0, 0.55);
}

[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-elevated: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.88);
  --border-subtle: rgba(15, 23, 42, 0.11);
  --border-accent: rgba(234, 88, 12, 0.45);
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --accent-primary: #ea580c;
  --accent-secondary: #f97316;
  --accent-glow: rgba(234, 88, 12, 0.14);
  --success: #16a34a;
  --danger: #dc2626;
  --code-bg: #0f172a;
  --shadow-lg: 0 20px 50px rgba(15, 23, 42, 0.1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color 0.2s ease, color 0.2s ease;
}

code, pre {
  font-family: 'JetBrains Mono', Consolas, monospace;
}

.bg-grid {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: -2;
}

.bg-glow {
  position: fixed;
  top: -180px;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  height: 450px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  pointer-events: none;
  z-index: -1;
}

.container {
  max-width: 1220px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header & Nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-glass);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-subtle);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-primary);
}

.brand-logo {
  width: 36px;
  height: 36px;
  border-radius: 8px;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-name {
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.brand-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.68rem;
  color: var(--accent-primary);
  font-weight: 600;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.92rem;
  font-weight: 500;
  transition: color 0.15s ease;
}

.nav-links a:hover {
  color: var(--text-primary);
}

.nav-links a.nav-highlight {
  color: var(--accent-primary);
  font-weight: 600;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.15s ease;
  border: 1px solid transparent;
  font-size: 0.92rem;
  padding: 10px 16px;
}

.btn-sm {
  padding: 8px 14px;
  font-size: 0.85rem;
}

.btn-lg {
  padding: 14px 20px;
}

.btn-block {
  width: 100%;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-primary), #ea580c);
  color: #ffffff;
  box-shadow: 0 4px 18px var(--accent-glow);
}

.btn-primary:hover {
  filter: brightness(1.08);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg-elevated);
  color: var(--text-primary);
  border-color: var(--border-subtle);
}

.btn-secondary:hover {
  border-color: var(--accent-primary);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border-color: var(--border-subtle);
}

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

.btn-icon {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  width: 36px;
  height: 36px;
  border-radius: 8px;
  cursor: pointer;
  display: grid;
  place-items: center;
}

/* Hero Section */
.hero {
  padding: 68px 0 76px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.08fr 0.92fr;
  gap: 44px;
  align-items: center;
}

.pill-banner {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-accent);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-secondary);
  margin-bottom: 20px;
}

.pill-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-primary);
  box-shadow: 0 0 8px var(--accent-primary);
}

.hero-title {
  font-size: clamp(2.4rem, 4.2vw, 3.6rem);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.text-gradient {
  background: linear-gradient(90deg, var(--accent-primary), #fbbf24);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.06rem;
  color: var(--text-secondary);
  margin-bottom: 28px;
}

.hero-subtitle code {
  background: var(--bg-elevated);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
  color: var(--accent-secondary);
}

.download-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 14px;
  padding: 18px;
  margin-bottom: 26px;
}

.download-buttons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.download-cta {
  flex-direction: column;
  align-items: flex-start;
  text-align: left;
  gap: 4px;
}

.cta-main {
  font-size: 0.95rem;
  font-weight: 700;
}

.cta-sub {
  font-size: 0.74rem;
  opacity: 0.86;
  font-weight: 500;
}

.checksum-bar {
  margin-top: 12px;
  border-top: 1px solid var(--border-subtle);
  padding-top: 10px;
}

.checksum-toggle {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-family: 'JetBrains Mono', monospace;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.checksum-toggle:hover {
  color: var(--text-primary);
}

.checksum-drawer {
  margin-top: 10px;
  background: var(--code-bg);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 0.75rem;
}

.hash-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 0;
  flex-wrap: wrap;
}

.hash-label {
  color: var(--text-secondary);
  min-width: 215px;
}

.hash-row code {
  color: #e2e8f0;
  word-break: break-all;
  flex: 1;
}

.btn-copy {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.18);
  color: #ffffff;
  border-radius: 4px;
  padding: 2px 8px;
  font-size: 0.72rem;
  cursor: pointer;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.metric-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  padding: 12px 14px;
}

.metric-val {
  display: block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--accent-primary);
}

.metric-lbl {
  font-size: 0.78rem;
  color: var(--text-secondary);
}

/* Interactive Studio Preview Window */
.app-window {
  background: #0d1117;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 14px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  color: #e6edf3;
}

.window-titlebar {
  background: #161b22;
  padding: 10px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.78rem;
}

.window-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
}

.win-icon {
  width: 18px;
  height: 18px;
}

.window-drive-pill {
  display: flex;
  align-items: center;
  gap: 6px;
  background: rgba(34, 197, 94, 0.12);
  border: 1px solid rgba(34, 197, 94, 0.35);
  color: #86efac;
  padding: 3px 10px;
  border-radius: 999px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
}

.status-led {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #22c55e;
}

.window-controls {
  display: flex;
  gap: 10px;
  color: #7d8590;
}

.window-body {
  display: grid;
  grid-template-columns: 165px 1fr;
  min-height: 360px;
}

.window-sidebar {
  background: #121720;
  border-right: 1px solid rgba(255, 255, 255, 0.07);
  padding: 12px 8px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.studio-tab {
  background: transparent;
  border: 1px solid transparent;
  color: #9ba7b8;
  text-align: left;
  padding: 9px 10px;
  border-radius: 8px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
}

.studio-tab:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.04);
}

.studio-tab.active {
  background: rgba(249, 115, 22, 0.15);
  border-color: rgba(249, 115, 22, 0.45);
  color: #fb923c;
}

.window-stage {
  padding: 16px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  font-size: 0.82rem;
}

.stage-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.stage-title {
  font-weight: 700;
  font-size: 0.95rem;
  color: #ffffff;
}

.stage-badge {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  background: rgba(249, 115, 22, 0.16);
  color: #fb923c;
  padding: 2px 8px;
  border-radius: 4px;
}

.stage-table {
  width: 100%;
  border-collapse: collapse;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.74rem;
  margin-bottom: 12px;
}

.stage-table th,
.stage-table td {
  padding: 6px 8px;
  text-align: left;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.stage-table th {
  color: #7d8590;
  font-weight: 500;
}

.stage-footer {
  background: #161b22;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 8px;
  padding: 10px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.73rem;
}

.burn-pill {
  background: #f97316;
  color: #fff;
  padding: 4px 10px;
  border-radius: 5px;
  font-weight: 600;
}

/* Sections */
.section {
  padding: 80px 0;
}

.section-alt {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.section-header {
  max-width: 760px;
  margin: 0 auto 48px;
  text-align: center;
}

.eyebrow {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--accent-primary);
  margin-bottom: 10px;
}

.section-header h2 {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.section-header p {
  color: var(--text-secondary);
  font-size: 1.02rem;
}

/* Comparison Grid */
.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.comp-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 14px;
  padding: 28px;
}

.comp-good {
  border-color: var(--border-accent);
  box-shadow: 0 12px 36px var(--accent-glow);
}

.comp-badge {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 6px;
  margin-bottom: 18px;
  background: rgba(255, 255, 255, 0.06);
}

.comp-good .comp-badge {
  background: rgba(249, 115, 22, 0.16);
  color: var(--accent-primary);
}

.comp-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
  font-size: 0.93rem;
  color: var(--text-secondary);
}

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

/* Feature Grid */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

/* A lone card on the last row stretches across the full width */
.feature-grid > .feature-card:last-child:nth-child(3n + 1) {
  grid-column: 1 / -1;
}

.feature-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 14px;
  padding: 26px;
  transition: transform 0.15s ease, border-color 0.15s ease;
}

.feature-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-accent);
}

.feature-icon {
  font-size: 1.75rem;
  margin-bottom: 12px;
}

.feature-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* FDE Case Study Section */
.fde-banner-card {
  background: linear-gradient(160deg, var(--bg-secondary) 0%, var(--bg-elevated) 100%);
  border: 1px solid var(--border-accent);
  border-radius: 18px;
  padding: 44px;
  box-shadow: var(--shadow-lg);
}

.fde-header {
  max-width: 860px;
  margin-bottom: 36px;
}

.fde-header h2 {
  font-size: clamp(1.75rem, 2.8vw, 2.35rem);
  font-weight: 800;
  margin-bottom: 14px;
  letter-spacing: -0.02em;
}

.fde-lead {
  font-size: 1.05rem;
  color: var(--text-secondary);
}

.fde-pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 36px;
}

.fde-pillar {
  background: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 24px;
}

.pillar-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-primary);
  margin-bottom: 8px;
}

.fde-pillar h3 {
  font-size: 1.05rem;
  margin-bottom: 10px;
}

.fde-pillar p {
  font-size: 0.89rem;
  color: var(--text-secondary);
}

.arch-box {
  background: var(--code-bg);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 22px;
  color: #e2e8f0;
}

.arch-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  color: #fb923c;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 16px;
}

.arch-flow {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.arch-node {
  flex: 1;
  min-width: 190px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 8px;
  padding: 12px 14px;
}

.arch-node-dual {
  border-color: rgba(249, 115, 22, 0.55);
  background: rgba(249, 115, 22, 0.08);
}

.arch-node strong {
  display: block;
  font-size: 0.84rem;
  margin-bottom: 4px;
  color: #ffffff;
}

.arch-node span {
  font-size: 0.75rem;
  color: #94a3b8;
}

.arch-arrow {
  color: var(--accent-primary);
  font-weight: 700;
}

/* Terminal Card */
.terminal-card {
  background: #070a0f;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.terminal-header {
  background: #111621;
  padding: 10px 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.term-dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
}
.term-dot.red { background: #ef4444; }
.term-dot.yellow { background: #f59e0b; }
.term-dot.green { background: #22c55e; }

.term-title {
  margin-left: 8px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.76rem;
  color: #94a3b8;
}

.terminal-body {
  padding: 22px;
  color: #e2e8f0;
  font-size: 0.84rem;
  overflow-x: auto;
  line-height: 1.65;
}

.c-comment {
  color: #fb923c;
}

/* Work With Me Section */
.work-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 18px;
  padding: 42px;
  display: grid;
  grid-template-columns: 1.35fr 0.65fr;
  gap: 36px;
  align-items: center;
}

.work-content h2 {
  font-size: clamp(1.6rem, 2.5vw, 2.1rem);
  font-weight: 800;
  margin-bottom: 12px;
}

.work-content p {
  color: var(--text-secondary);
  margin-bottom: 18px;
}

.fde-services {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--text-secondary);
}

.fde-services strong {
  color: var(--text-primary);
}

.work-cta-box {
  background: var(--bg-elevated);
  border: 1px solid var(--border-accent);
  border-radius: 14px;
  padding: 24px;
}

.engineer-badge {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-subtle);
}

.eng-avatar {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent-primary), #ea580c);
  color: #ffffff;
  font-weight: 800;
  font-family: 'JetBrains Mono', monospace;
  display: grid;
  place-items: center;
  font-size: 1.1rem;
}

.eng-name {
  font-weight: 700;
  font-size: 0.98rem;
}

.eng-role {
  font-size: 0.76rem;
  color: var(--text-secondary);
}

.work-buttons {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border-subtle);
  padding: 28px 0;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer-logo {
  width: 22px;
  height: 22px;
}

.footer-right {
  display: flex;
  gap: 20px;
}

.footer-right a {
  color: var(--text-secondary);
  text-decoration: none;
}

.footer-right a:hover {
  color: var(--text-primary);
}

@media (max-width: 980px) {
  .hero-grid,
  .comparison-grid,
  .feature-grid,
  .fde-pillars,
  .work-card {
    grid-template-columns: 1fr;
  }
  .nav-links {
    display: none;
  }
  .download-buttons {
    grid-template-columns: 1fr;
  }
  .window-body {
    grid-template-columns: 1fr;
  }
  .window-sidebar {
    flex-direction: row;
    overflow-x: auto;
  }
}