/* ── Aviation Dark ─────────────────────────────────────── */
:root {
  /* Backgrounds */
  --bg:           #0b0e1a;
  --bg-dark:      #070a14;
  --bg-hl:        #1a2642;

  /* Borders */
  --border:       rgba(59, 130, 246, 0.2);
  --border-hover: rgba(59, 130, 246, 0.4);

  /* Foreground */
  --fg:           #e2e8f0;
  --fg-dim:       #94a3b8;
  --fg-muted:     #64748b;
  --fg-on-accent: #ffffff;

  /* Accent colors */
  --blue:         #3b82f6;
  --blue-dark:    #2563eb;
  --sky:          #38bdf8;
  --green:        #4ade80;
  --amber:        #f59e0b;
  --red:          #f87171;

  /* Derived opacity tints — auto-follow theme via color-mix() */
  --blue-opacity-faint:   color-mix(in srgb, var(--blue)  6%, transparent);
  --blue-opacity-subtle:  color-mix(in srgb, var(--blue) 10%, transparent);
  --blue-opacity-muted:   color-mix(in srgb, var(--blue) 14%, transparent);
  --blue-opacity-light:   color-mix(in srgb, var(--blue) 22%, transparent);
  --blue-opacity-medium:  color-mix(in srgb, var(--blue) 40%, transparent);
  --sky-opacity-faint:    color-mix(in srgb, var(--sky)   8%, transparent);
  --sky-opacity-subtle:   color-mix(in srgb, var(--sky)  15%, transparent);
  --sky-opacity-medium:   color-mix(in srgb, var(--sky)  22%, transparent);

  /* Component surfaces */
  --glass-bg:   rgba(15, 22, 41, 0.72);
  --header-bg:  rgba(11, 14, 26, 0.88);

  /* Shadows */
  --shadow-sm:  0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-md:  0 8px 40px rgba(0, 0, 0, 0.5);

  /* Motion */
  --duration-fast:   0.15s;
  --duration-normal: 0.2s;

  /* Shape */
  --radius-sm:   6px;
  --radius-md:   10px;
  --radius-lg:   12px;
  --radius-pill: 100px;

  --nav-h: 64px;
}

/* ── Light theme ───────────────────────────────────────── */
:root[data-theme="light"] {
  --bg:           #f8fafc;
  --bg-dark:      #f1f5f9;
  --bg-hl:        #e2e8f0;
  --border:       rgba(15, 23, 42, 0.14);
  --border-hover: rgba(15, 23, 42, 0.35);
  --fg:           #0f172a;
  --fg-dim:       #475569;
  --fg-muted:     #64748b;
  --fg-on-accent: #ffffff;
  --blue:         #2563eb;
  --blue-dark:    #1d4ed8;
  --sky:          #0284c7;
  --green:        #16a34a;
  --amber:        #b45309;
  --red:          #dc2626;
  --glass-bg:     rgba(255, 255, 255, 0.82);
  --header-bg:    rgba(248, 250, 252, 0.92);
  --shadow-sm:    0 4px 24px rgba(15, 23, 42, 0.08);
  --shadow-md:    0 8px 40px rgba(15, 23, 42, 0.12);
}

/* ── Reset ─────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: "Inter", "Segoe UI", system-ui, sans-serif;
  line-height: 1.7;
  letter-spacing: -0.01em;
  min-height: 100vh;
  overflow-x: hidden;
  transition: background var(--duration-normal), color var(--duration-normal);
}

h1, h2, h3 { letter-spacing: -0.03em; }

/* Subtle engineering dot-grid background */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: radial-gradient(circle, var(--blue-opacity-faint) 1px, transparent 1px);
  background-size: 28px 28px;
  z-index: -2;
  pointer-events: none;
}


/* Theme-aware logo variants */
[data-theme="dark"]  .logo-light { display: none; }
[data-theme="light"] .logo-dark  { display: none; }

/* ── Glass utility ─────────────────────────────────────── */
.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255, 255, 255, 0.04);
  transition: border-color var(--duration-normal), box-shadow var(--duration-normal), transform var(--duration-normal);
}

.glass:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md), 0 0 28px var(--blue-opacity-faint);
  transform: translateY(-2px);
}

/* Light: white frosted cards */
[data-theme="light"] .glass {
  box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255, 255, 255, 0.8);
}
[data-theme="light"] .glass:hover {
  box-shadow: var(--shadow-md), 0 0 28px var(--blue-opacity-subtle);
}

/* ── Buttons ───────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  transition: background var(--duration-normal), box-shadow var(--duration-normal), transform var(--duration-fast);
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--blue);
  border-color: var(--blue);
  color: var(--fg-on-accent);
}
.btn-primary:hover {
  background: var(--blue-dark);
  box-shadow: 0 0 28px var(--blue-opacity-medium);
  transform: translateY(-1px);
  text-decoration: none;
  color: var(--fg-on-accent);
}

.btn-secondary {
  background: var(--blue-opacity-subtle);
  border-color: var(--blue-opacity-light);
  color: var(--sky);
}
.btn-secondary:hover {
  background: var(--blue-opacity-muted);
  box-shadow: 0 0 20px var(--blue-opacity-subtle);
  transform: translateY(-1px);
  text-decoration: none;
}

/* ── Navigation ────────────────────────────────────────── */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  background: var(--header-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 2rem;
  gap: 1rem;
  transition: background var(--duration-normal), border-color var(--duration-normal);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--fg);
  text-decoration: none;
  letter-spacing: 0.02em;
  flex-shrink: 0;
}
.nav-logo span { color: var(--blue); }
.nav-logo-icon {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
}

/* Day mode — bright sky blue, warm earth, white reference marks */
[data-theme="light"] .nav-logo-icon .ai-bg     { fill: #c0d0ea; }
[data-theme="light"] .nav-logo-icon .ai-sky    { fill: #3d82c4; }
[data-theme="light"] .nav-logo-icon .ai-ground { fill: #8c6030; }
[data-theme="light"] .nav-logo-icon .ai-ring   { stroke: #1a3a8c; }
[data-theme="light"] .nav-logo-icon .ai-horizon{ stroke: #ffffff; }
[data-theme="light"] .nav-logo-icon .ai-wing   { stroke: #ffffff; }
[data-theme="light"] .nav-logo-icon .ai-center { fill: #ffffff; }
[data-theme="light"] .nav-logo-icon .ai-tick   { stroke: #1a3a8c; }
[data-theme="light"] .nav-logo-icon .ai-bank   { stroke: #ffffff; opacity: 0.65; }

nav {
  display: flex;
  align-items: center;
  gap: 0.2rem;
  margin-left: auto;
}

nav a {
  color: var(--fg-dim);
  text-decoration: none;
  font-size: 0.875rem;
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-sm);
  transition: color var(--duration-normal), background var(--duration-normal);
}
nav a:hover { color: var(--fg); background: var(--blue-opacity-subtle); }
nav a.active { color: var(--blue); background: var(--blue-opacity-subtle); }

nav a.nav-contact {
  background: var(--blue-opacity-subtle);
  border: 1px solid var(--blue-opacity-light);
  color: var(--blue);
  margin-left: 0.5rem;
}
nav a.nav-contact:hover {
  background: var(--blue);
  color: var(--fg-on-accent);
  box-shadow: 0 0 16px var(--blue-opacity-medium);
}

/* Theme toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  background: var(--blue-opacity-subtle);
  border: 1px solid var(--blue-opacity-muted);
  border-radius: var(--radius-sm);
  color: var(--fg-dim);
  cursor: pointer;
  flex-shrink: 0;
  transition: background var(--duration-normal), color var(--duration-normal), border-color var(--duration-normal);
}
.theme-toggle:hover {
  background: var(--blue-opacity-muted);
  color: var(--fg);
  border-color: var(--border-hover);
}
.theme-toggle svg { width: 16px; height: 16px; }

/* Show sun in dark mode, moon in light mode */
.icon-moon { display: none; }
:root[data-theme="light"] .icon-moon { display: block; }
:root[data-theme="light"] .icon-sun  { display: none; }

/* Hamburger — mobile only */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  flex-shrink: 0;
}
.nav-toggle span {
  display: block;
  width: 22px; height: 2px;
  background: var(--fg-dim);
  border-radius: 2px;
  transition: transform var(--duration-normal), opacity var(--duration-normal);
}

/* ── Hero ──────────────────────────────────────────────── */
.hero {
  min-height: calc(100vh - var(--nav-h));
  display: flex;
  align-items: center;
  padding: 4rem 0;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3.5rem;
  align-items: center;
  width: 100%;
}

.hero-text {
  display: flex;
  flex-direction: column;
}

/* Shared pill base */
.hero-badge,
.expertise-tag,
.skill-pill {
  display: inline-block;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--sky);
  background: var(--sky-opacity-faint);
  border: 1px solid var(--sky-opacity-subtle);
}

.hero-badge {
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  border-radius: var(--radius-pill);
  padding: 0.3rem 1rem;
  margin-bottom: 1.5rem;
}

.hero-title {
  font-size: clamp(2.1rem, 5.5vw, 3.4rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.04em;
  margin-bottom: 1.25rem;
  background: linear-gradient(140deg, var(--blue) 0%, var(--sky) 55%, var(--fg) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-sub {
  font-size: 1.05rem;
  color: var(--fg-dim);
  margin-bottom: 2.25rem;
  max-width: 540px;
  line-height: 1.75;
}

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

/* ── Layout ────────────────────────────────────────────── */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 5rem 0;
}

.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 2.25rem;
  gap: 1rem;
}

/* Shared label base — used by .section-label and .cta-label */
.section-label,
.cta-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--blue);
}
.section-label { margin-bottom: 0.4rem; }
.cta-label     { margin-bottom: 1rem; }

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--fg);
  line-height: 1.2;
}

.section-link {
  font-size: 0.85rem;
  color: var(--blue);
  text-decoration: none;
  flex-shrink: 0;
  white-space: nowrap;
}
.section-link:hover { text-decoration: underline; }

/* ── Expertise section ─────────────────────────────────── */
.expertise {
  padding: 5rem 0;
}

.expertise-intro {
  max-width: 540px;
}

.expertise-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1.25rem;
  margin-top: 2.5rem;
}

/* Shared card base — .card and .expertise-card */
.card,
.expertise-card {
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
}

.card        { gap: 0.5rem; text-decoration: none; color: inherit; }
.expertise-card { gap: 0.75rem; }

.expertise-icon {
  width: 42px; height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--blue-opacity-subtle);
  border: 1px solid var(--blue-opacity-muted);
  border-radius: var(--radius-md);
  color: var(--blue);
  flex-shrink: 0;
}
.expertise-icon svg { width: 20px; height: 20px; }

.expertise-name {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--fg);
}

.expertise-desc {
  font-size: 0.85rem;
  color: var(--fg-dim);
  line-height: 1.65;
  flex: 1;
}

.expertise-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.25rem;
}

.expertise-tag {
  font-size: 0.68rem;
  border-radius: 4px;
  padding: 0.15rem 0.5rem;
}

/* ── Card grid ─────────────────────────────────────────── */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.25rem;
}

.card-tag {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--amber);
}

.card-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--fg);
  line-height: 1.35;
}

.card-desc {
  font-size: 0.875rem;
  color: var(--fg-dim);
  line-height: 1.65;
  flex: 1;
}

.card-meta {
  font-size: 0.78rem;
  color: var(--fg-muted);
  margin-top: 0.5rem;
}

/* ── Contact / CTA section ─────────────────────────────── */
.cta-section {
  padding: 6rem 0;
  text-align: center;
}

.cta-inner {
  max-width: 580px;
  margin: 0 auto;
  padding: 3rem 3.5rem;
}

.cta-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--fg);
  line-height: 1.2;
  margin-bottom: 1rem;
}

.cta-sub {
  font-size: 0.975rem;
  color: var(--fg-dim);
  line-height: 1.75;
  margin-bottom: 2rem;
}

.cta-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ── Project logo ──────────────────────────────────────── */
.project-logo {
  display: block;
  max-width: 220px;
  height: auto;
  margin-bottom: 1.75rem;
}

/* ── Content pages ─────────────────────────────────────── */
.page-header {
  padding: 5rem 0 3rem;
  border-bottom: 1px solid var(--blue-opacity-subtle);
  margin-bottom: 3rem;
}

.page-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  line-height: 1.15;
  background: linear-gradient(120deg, var(--blue) 0%, var(--sky) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.75rem;
}

.page-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  color: var(--fg-dim);
  font-size: 0.875rem;
}

/* Spacing utilities (replaces inline styles) */
.page-body    { padding-bottom: 5rem; }
.page-actions { padding-bottom: 3rem; }
.section-content { margin-bottom: 3rem; }

.content {
  max-width: 760px;
}

.content h1, .content h2, .content h3, .content h4 {
  line-height: 1.3;
  margin: 2.25rem 0 0.75rem;
}
.content h1 { font-size: 1.9rem; color: var(--fg); font-weight: 700; }
.content h2 {
  font-size: 1.25rem;
  color: var(--sky);
  font-weight: 600;
  border-bottom: 1px solid var(--blue-opacity-muted);
  padding-bottom: 0.4rem;
}
.content h3 { font-size: 1.05rem; color: var(--blue); font-weight: 600; }
.content h4 { font-size: 0.95rem; color: var(--fg-dim); font-weight: 600; }

.content p    { margin: 1rem 0; }
.content a    { color: var(--blue); text-underline-offset: 3px; }
.content a:hover { color: var(--sky); }
.content strong { color: var(--fg); font-weight: 600; }
.content em     { color: var(--fg-dim); font-style: italic; }

.content ul, .content ol {
  padding-left: 1.5rem;
  margin: 1rem 0;
}
.content li { margin: 0.4rem 0; color: var(--fg-dim); }

.content blockquote {
  border-left: 3px solid var(--blue);
  padding: 0.75rem 1.25rem;
  margin: 1.5rem 0;
  background: var(--blue-opacity-faint);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--fg-dim);
  font-style: italic;
}

.content code {
  background: var(--bg-dark);
  color: var(--green);
  padding: 0.15em 0.45em;
  border-radius: 4px;
  font-size: 0.875em;
  font-family: "JetBrains Mono", "Fira Code", ui-monospace, monospace;
  border: 1px solid var(--blue-opacity-muted);
}

.content pre {
  background: var(--bg-dark);
  border: 1px solid var(--blue-opacity-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  overflow-x: auto;
  margin: 1.5rem 0;
}
.content pre code {
  background: none;
  padding: 0;
  color: var(--fg);
  font-size: 0.875rem;
  border: none;
}

/* Light mode: Zola's syntax highlighter bakes dark inline styles at build time.
   Override them so code blocks are readable in day mode. */
[data-theme="light"] .content pre {
  background: #f6f8fa !important;
  color: #24292e !important;
}
[data-theme="light"] .content pre code {
  color: #24292e !important;
  background: none !important;
}
[data-theme="light"] .content pre code span {
  color: inherit !important;
  background: none !important;
}

/* ── Tables ────────────────────────────────────────────── */
.content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.75rem 0;
  font-size: 0.875rem;
  border: 1px solid var(--blue-opacity-muted);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.content thead th {
  text-align: left;
  padding: 0.7rem 1rem;
  background: var(--bg-dark);
  color: var(--sky);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--blue-opacity-muted);
}
.content tbody td {
  padding: 0.7rem 1rem;
  border-bottom: 1px solid var(--blue-opacity-faint);
  color: var(--fg-dim);
  vertical-align: top;
}
.content tbody tr:last-child td { border-bottom: none; }
.content tbody tr:hover td {
  background: var(--blue-opacity-faint);
  color: var(--fg);
}

/* ── Schematic rule — engineering drawing section divider ── */
.schematic-rule {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0 1.5rem;
  max-width: 1100px;
  margin: 0 auto;
  color: var(--fg-muted);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-family: "Inter", system-ui, sans-serif;
}
.schematic-rule::before,
.schematic-rule::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ── EFB Instrument Panel ──────────────────────────────── */
.efb-panel {
  background: var(--bg-dark);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  font-family: "JetBrains Mono", "Fira Code", ui-monospace, monospace;
}

.efb-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.65rem 1.25rem;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg-dark) 60%, var(--bg-hl));
}

.efb-header-label {
  font-size: 0.6rem;
  letter-spacing: 0.14em;
  color: var(--fg-muted);
  text-transform: uppercase;
  font-family: "Inter", system-ui, sans-serif;
}

.efb-status {
  font-size: 0.6rem;
  letter-spacing: 0.08em;
  color: var(--green);
}

.efb-data-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
}

.efb-field {
  padding: 0.9rem 1.1rem;
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}
.efb-field:nth-child(3n)   { border-right: none; }
.efb-field:nth-child(4),
.efb-field:nth-child(5),
.efb-field:nth-child(6)    { border-bottom: none; }

.efb-field-label {
  font-size: 0.58rem;
  letter-spacing: 0.12em;
  color: var(--fg-muted);
  text-transform: uppercase;
  font-family: "Inter", system-ui, sans-serif;
}

.efb-field-value {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--sky);
  letter-spacing: 0.02em;
}

.efb-sync-section {
  border-top: 1px solid var(--border);
  padding: 0.75rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.efb-sync-row {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.efb-sync-indicator {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
  flex-shrink: 0;
}

.efb-sync-device {
  font-size: 0.68rem;
  color: var(--fg-dim);
  width: 46px;
  flex-shrink: 0;
  font-family: "Inter", system-ui, sans-serif;
  letter-spacing: 0;
}

.efb-sync-bar {
  flex: 1;
  height: 2px;
  background: var(--border);
  border-radius: 1px;
  overflow: hidden;
}

.efb-sync-fill {
  display: block;
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, var(--sky), var(--blue));
}

.efb-sync-status {
  font-size: 0.58rem;
  letter-spacing: 0.12em;
  color: var(--green);
  text-transform: uppercase;
  font-family: "Inter", system-ui, sans-serif;
}

.efb-sync-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
  flex-shrink: 0;
}

/* ── EFB animations ────────────────────────────────────── */
@keyframes pulse-dot {
  0%, 100% { opacity: 1;   transform: scale(1);   }
  50%       { opacity: 0.3; transform: scale(0.75); }
}
@keyframes sync-shimmer {
  0%   { transform: translateX(-200%); }
  100% { transform: translateX(200%);  }
}

.efb-sync-dot {
  animation: pulse-dot 2.2s ease-in-out infinite;
}
.efb-sync-row:nth-child(2) .efb-sync-dot {
  animation-delay: 0.9s;
}
.efb-sync-indicator {
  animation: pulse-dot 2.2s ease-in-out infinite;
}
.efb-sync-row:nth-child(2) .efb-sync-indicator {
  animation-delay: 0.9s;
}
.efb-sync-fill {
  position: relative;
  overflow: hidden;
}
.efb-sync-fill::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.25), transparent);
  animation: sync-shimmer 2.4s ease-in-out infinite;
}

/* ── Stats strip ────────────────────────────────────────── */
.stats-strip {
  border-top:    1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 1.5rem 1.5rem;
  background: color-mix(in srgb, var(--bg-dark) 60%, transparent);
}
.stats-row {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
}
.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
}
.stat-value {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--sky);
  letter-spacing: -0.02em;
  line-height: 1;
}
.stat-label {
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-muted);
}
.stat-sep {
  color: var(--border);
  font-size: 1.4rem;
  line-height: 1;
  align-self: center;
}

/* ── Insights ───────────────────────────────────────────── */
.insights {
  padding: 5rem 0 4rem;
}
.insight-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  max-width: 860px;
  margin: 0 auto;
}
.insight-item {
  display: grid;
  grid-template-columns: 3rem 1fr;
  gap: 1.5rem;
  align-items: baseline;
  padding: 2rem 0;
  border-bottom: 1px solid var(--border);
}
.insight-item:first-child { border-top: 1px solid var(--border); }
.insight-num {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 0.65rem;
  color: var(--fg-muted);
  letter-spacing: 0.1em;
  padding-top: 0.3rem;
}
.insight-text {
  font-size: 1.15rem;
  line-height: 1.65;
  color: var(--fg);
  margin: 0;
  letter-spacing: -0.01em;
}
.insight-cta {
  display: inline-block;
  margin-top: 2.5rem;
  margin-left: calc(3rem + 1.5rem);
  color: var(--sky);
  font-size: 0.9rem;
  letter-spacing: 0.02em;
  text-decoration: none;
  transition: opacity var(--duration-fast);
}
.insight-cta:hover { opacity: 0.7; }

/* ── Featured article ───────────────────────────────────── */
.featured-article {
  display: block;
  text-decoration: none;
  color: inherit;
  padding: 2rem 2.5rem;
  border-radius: var(--radius-lg);
  margin-bottom: 1.5rem;
  border-left: 3px solid var(--sky);
  transition: border-color var(--duration-normal), box-shadow var(--duration-normal);
}
.featured-article:hover {
  border-left-color: var(--blue);
  box-shadow: var(--shadow-md);
}
.featured-article-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.75rem;
}
.featured-tag {
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--sky);
  background: var(--sky-opacity-faint);
  border: 1px solid var(--sky-opacity-subtle);
  border-radius: var(--radius-sm);
  padding: 0.15rem 0.55rem;
}
.featured-date {
  font-size: 0.75rem;
  color: var(--fg-muted);
}
.featured-article-title {
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--fg);
  margin: 0 0 0.75rem;
  letter-spacing: -0.02em;
  line-height: 1.3;
}
.featured-article-desc {
  font-size: 0.9rem;
  color: var(--fg-dim);
  line-height: 1.7;
  margin: 0 0 1.25rem;
  max-width: 680px;
}
.featured-article-cta {
  font-size: 0.8rem;
  color: var(--sky);
  letter-spacing: 0.03em;
}

/* ── Divider ───────────────────────────────────────────── */
.divider {
  border: none;
  border-top: 1px solid var(--blue-opacity-faint);
  margin: 0;
}

/* ── Footer ────────────────────────────────────────────── */
footer {
  border-top: 1px solid var(--border);
  padding: 3rem 1.5rem 2.5rem;
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
  text-align: center;
}

.footer-logo {
  font-size: 1rem;
  font-weight: 700;
  color: var(--fg-dim);
  text-decoration: none;
  letter-spacing: 0.02em;
}
.footer-logo span { color: var(--blue); }

.footer-tagline {
  font-size: 0.78rem;
  color: var(--fg-muted);
  letter-spacing: 0.06em;
}

.footer-links {
  display: flex;
  gap: 1.75rem;
  flex-wrap: wrap;
  justify-content: center;
}
.footer-links a {
  font-size: 0.82rem;
  color: var(--fg-muted);
  text-decoration: none;
  transition: color var(--duration-normal);
}
.footer-links a:hover { color: var(--blue); }

.footer-copy {
  font-size: 0.78rem;
  color: var(--fg-muted);
}

/* ── Scrollbar ─────────────────────────────────────────── */
::-webkit-scrollbar       { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-dark); }
::-webkit-scrollbar-thumb { background: var(--bg-hl); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--blue-opacity-medium); }

/* ── Collapsible technical detail ─────────────────────── */
.tech-detail {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin: 2rem 0;
  overflow: hidden;
}

.tech-detail summary {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.85rem 1.25rem;
  background: var(--bg-dark);
  color: var(--fg-dim);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  user-select: none;
  list-style: none;
  transition: background var(--duration-normal), color var(--duration-normal);
}
.tech-detail summary::-webkit-details-marker { display: none; }
.tech-detail summary::before {
  content: "▶";
  font-size: 0.6rem;
  color: var(--blue);
  transition: transform var(--duration-normal);
}
.tech-detail[open] summary::before { transform: rotate(90deg); }
.tech-detail[open] summary {
  color: var(--fg);
  border-bottom: 1px solid var(--border);
}
.tech-detail summary:hover { background: var(--bg-hl); color: var(--fg); }

.tech-detail-body {
  padding: 1.5rem 1.75rem;
}
.tech-detail-body > *:first-child { margin-top: 0; }

/* ── Legal pages ───────────────────────────────────────── */
.legal-content {
  max-width: 680px;
}
.legal-content h2 {
  margin-top: 2.5rem;
}
.legal-content p {
  color: var(--fg-dim);
}

/* ── Skill pills (about page) ──────────────────────────── */
.skill-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0.75rem 0 1.5rem;
}
.skill-pill {
  font-size: 0.78rem;
  border-radius: var(--radius-sm);
  padding: 0.3rem 0.8rem;
}

/* ── Responsive ────────────────────────────────────────── */
@media (max-width: 640px) {
  header { padding: 0 1rem; gap: 0.5rem; }

  .nav-toggle { display: flex; }

  nav {
    display: none;
    position: absolute;
    top: var(--nav-h);
    left: 0; right: 0;
    flex-direction: column;
    padding: 1rem;
    background: var(--header-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    gap: 0.25rem;
  }
  nav.open { display: flex; }
  nav a { width: 100%; padding: 0.75rem 1rem; }
  nav a.nav-contact { margin-left: 0; }

  .hero-inner { grid-template-columns: 1fr; gap: 2rem; }
  .efb-panel  { order: -1; }

  .card-grid { grid-template-columns: 1fr; }
  .expertise-grid { grid-template-columns: 1fr; }

  .page-header { padding: 3rem 0 2rem; }

  .cta-inner { padding: 2rem 1.5rem; }

  .footer-links { gap: 1.25rem; }
}