/* ==========================================================================
   SoraDev-ID - Design System: Engineered Instrument / Technical Utility
   Vanilla CSS | High Contrast | WCAG AA Compliant | Ultra-Performance
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Design Tokens & Theme Variables
   -------------------------------------------------------------------------- */
:root {
  /* Core Palette: Technical Paper (Light Mode Default) */
  --bg-primary: #FFFFFF;
  --bg-surface: #F8FAFC;
  --bg-surface-elevated: #F1F5F9;
  --bg-surface-hover: #E2E8F0;
  
  --text-primary: #09090B;
  --text-secondary: #334155; /* 9.5:1 contrast */
  --text-muted: #475569;     /* 5.5:1 contrast - exceeds WCAG AA */
  
  --border-color: #E2E8F0;
  --border-subtle: #F1F5F9;
  --border-hover: #CBD5E1;

  /* Single Consistent Functional Accent: Electric Cobalt */
  --accent: #2563EB;
  --accent-hover: #1D4ED8;
  --accent-subtle: rgba(37, 99, 235, 0.08);
  --accent-border: rgba(37, 99, 235, 0.22);
  --accent-text: #FFFFFF;
  
  /* Status Indicators (Semantic & high contrast) */
  --status-maintained: #047857;
  --status-maintained-bg: #ECFDF5;
  --status-tooling: #1D4ED8;
  --status-tooling-bg: #EFF6FF;
  --status-planned: #6D28D9;
  --status-planned-bg: #F5F3FF;

  /* Chrome & Typography Tokens */
  --nav-bg: rgba(255, 255, 255, 0.95);
  --nav-border: #E2E8F0;
  --focus-ring: #2563EB;
  
  --font-sans: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-pill: 9999px;

  --container-max-width: 72rem; /* 1152px */
  --container-padding: clamp(1.25rem, 5vw, 2.5rem);
  --section-spacing: clamp(4rem, 7vw, 6.5rem);

  color-scheme: light;
}

/* System Dark Mode Detection */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg-primary: #09090B;
    --bg-surface: #121215;
    --bg-surface-elevated: #18181B;
    --bg-surface-hover: #222226;
    
    --text-primary: #F8FAFC;
    --text-secondary: #CBD5E1; /* 11.5:1 contrast on dark */
    --text-muted: #94A3B8;     /* 5.6:1 contrast on dark - passes WCAG AA */
    
    --border-color: #27272A;
    --border-subtle: #18181B;
    --border-hover: #3F3F46;

    /* Dark Mode Accent: Radiant Cobalt (WCAG AA Compliant > 5.5:1) */
    --accent: #3B82F6;
    --accent-hover: #60A5FA;
    --accent-subtle: rgba(59, 130, 246, 0.15);
    --accent-border: rgba(59, 130, 246, 0.35);
    --accent-text: #09090B;
    
    --status-maintained: #34D399;
    --status-maintained-bg: rgba(52, 211, 153, 0.15);
    --status-tooling: #60A5FA;
    --status-tooling-bg: rgba(96, 165, 250, 0.15);
    --status-planned: #C4B5FD;
    --status-planned-bg: rgba(196, 181, 253, 0.15);

    --nav-bg: rgba(9, 9, 11, 0.95);
    --nav-border: #27272A;
    --focus-ring: #60A5FA;

    color-scheme: dark;
  }
}

/* Explicit User Dark Mode Selection */
[data-theme="dark"] {
  --bg-primary: #09090B;
  --bg-surface: #121215;
  --bg-surface-elevated: #18181B;
  --bg-surface-hover: #222226;
  
  --text-primary: #F8FAFC;
  --text-secondary: #CBD5E1;
  --text-muted: #94A3B8;
  
  --border-color: #27272A;
  --border-subtle: #18181B;
  --border-hover: #3F3F46;

  --accent: #3B82F6;
  --accent-hover: #60A5FA;
  --accent-subtle: rgba(59, 130, 246, 0.15);
  --accent-border: rgba(59, 130, 246, 0.35);
  --accent-text: #09090B;
  
  --status-maintained: #34D399;
  --status-maintained-bg: rgba(52, 211, 153, 0.15);
  --status-tooling: #60A5FA;
  --status-tooling-bg: rgba(96, 165, 250, 0.15);
  --status-planned: #C4B5FD;
  --status-planned-bg: rgba(196, 181, 253, 0.15);

  --nav-bg: rgba(9, 9, 11, 0.95);
  --nav-border: #27272A;
  --focus-ring: #60A5FA;

  color-scheme: dark;
}

/* Explicit User Light Mode Selection */
[data-theme="light"] {
  --bg-primary: #FFFFFF;
  --bg-surface: #F8FAFC;
  --bg-surface-elevated: #F1F5F9;
  --bg-surface-hover: #E2E8F0;
  
  --text-primary: #09090B;
  --text-secondary: #334155;
  --text-muted: #475569;
  
  --border-color: #E2E8F0;
  --border-subtle: #F1F5F9;
  --border-hover: #CBD5E1;

  --accent: #2563EB;
  --accent-hover: #1D4ED8;
  --accent-subtle: rgba(37, 99, 235, 0.08);
  --accent-border: rgba(37, 99, 235, 0.22);
  --accent-text: #FFFFFF;
  
  --status-maintained: #047857;
  --status-maintained-bg: #ECFDF5;
  --status-tooling: #1D4ED8;
  --status-tooling-bg: #EFF6FF;
  --status-planned: #6D28D9;
  --status-planned-bg: #F5F3FF;

  --nav-bg: rgba(255, 255, 255, 0.95);
  --nav-border: #E2E8F0;
  --focus-ring: #2563EB;

  color-scheme: light;
}

/* --------------------------------------------------------------------------
   2. Base Reset & Typography
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-secondary);
  background-color: var(--bg-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color 0.2s ease, color 0.2s ease;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection {
  background-color: var(--accent);
  color: var(--accent-text);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    animation-duration: 0.001s !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.15s !important;
  }
}

img, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.15s ease, border-color 0.15s ease;
}

button {
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  top: -4rem;
  left: 1.5rem;
  padding: 0.75rem 1.25rem;
  background-color: var(--accent);
  color: var(--accent-text);
  font-weight: 600;
  font-size: 0.875rem;
  border-radius: var(--radius-md);
  z-index: 9999;
  transition: top 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.skip-link:focus {
  top: 1.25rem;
}

.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-inline: auto;
  padding-inline: var(--container-padding);
  padding-bottom: 2rem; /* Ensure generous clearance from bottom section divider */
}

.section {
  padding-top: var(--section-spacing);
  padding-bottom: var(--section-spacing);
  border-bottom: 1px solid var(--border-color);
}

.section:last-of-type {
  border-bottom: none;
}

.section-header {
  margin-bottom: 2.25rem;
}

.section-title {
  font-size: clamp(1.625rem, 3.2vw, 2.125rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
  letter-spacing: -0.03em;
}

.section-subtitle {
  margin-top: 0.5rem;
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 44rem;
}

/* --------------------------------------------------------------------------
   3. Navigation Header
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--nav-border);
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
  padding-bottom: 0;
}

.site-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  font-family: var(--font-mono);
}

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

.site-logo .logo-prompt {
  color: var(--accent);
  font-weight: 800;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

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

@media (min-width: 768px) {
  .nav-menu {
    display: flex;
  }
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 0.375rem 0.125rem;
  position: relative;
  transition: color 0.15s ease;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: -0.25rem;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--accent);
  border-radius: var(--radius-sm);
}

.theme-toggle-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  min-width: 44px;
  min-height: 44px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background-color: var(--bg-surface);
  color: var(--text-primary);
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.theme-toggle-btn:hover {
  border-color: var(--border-hover);
  background-color: var(--bg-surface-elevated);
}

.theme-toggle-btn:active {
  transform: scale(0.96);
}

.menu-toggle-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  min-width: 44px;
  min-height: 44px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background-color: var(--bg-surface);
  color: var(--text-primary);
}

@media (min-width: 768px) {
  .menu-toggle-btn {
    display: none;
  }
}

.mobile-nav-drawer {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  padding: 1.25rem var(--container-padding);
}

.mobile-nav-drawer.open {
  display: block;
}

.mobile-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.mobile-nav-link {
  display: block;
  padding: 0.75rem 0.5rem;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  min-height: 44px;
}

.mobile-nav-link:hover {
  background-color: var(--bg-surface);
  color: var(--accent);
}

/* --------------------------------------------------------------------------
   4. Hero Section
   -------------------------------------------------------------------------- */
.hero-section {
  padding-top: clamp(3rem, 6vw, 5rem);
  padding-bottom: clamp(3rem, 6vw, 5rem);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: center;
}

@media (min-width: 840px) {
  .hero-grid {
    grid-template-columns: 1.4fr 1fr;
    gap: 3.5rem;
  }
}

.hero-technical-lead {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.02em;
  margin-bottom: 0.75rem;
}

.hero-title {
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.1;
  color: var(--text-primary);
  letter-spacing: -0.04em;
  margin-bottom: 1rem;
}

.hero-tagline {
  font-size: clamp(1.0625rem, 2vw, 1.2rem);
  line-height: 1.55;
  color: var(--text-secondary);
  max-width: 38rem;
  margin-bottom: 2rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.875rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  min-height: 44px;
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.btn:active {
  transform: scale(0.98);
}

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

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

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

.btn-secondary:hover {
  background-color: var(--bg-surface-elevated);
  border-color: var(--border-hover);
}

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

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

.hero-media {
  display: flex;
  justify-content: center;
}

@media (min-width: 840px) {
  .hero-media {
    justify-content: flex-end;
  }
}

.avatar-instrument-frame {
  position: relative;
  width: 100%;
  max-width: 320px;
  aspect-ratio: 1 / 1;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  background-color: var(--bg-surface);
  padding: 0.5rem;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
}

.avatar-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius-md);
  filter: grayscale(15%);
  transition: filter 0.25s ease;
}

.avatar-instrument-frame:hover .avatar-img {
  filter: grayscale(0%);
}

.avatar-meta-tag {
  position: absolute;
  bottom: 1rem;
  left: 1rem;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.25rem 0.625rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   5. About Section
   -------------------------------------------------------------------------- */
.about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

@media (min-width: 768px) {
  .about-layout {
    grid-template-columns: 2fr 1fr;
    gap: 3.5rem;
  }
}

.about-text-container {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.about-paragraph {
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

.about-sidebar {
  border-top: 1px solid var(--border-color);
  padding-top: 1.5rem;
}

@media (min-width: 768px) {
  .about-sidebar {
    border-top: none;
    border-left: 1px solid var(--border-color);
    padding-top: 0;
    padding-left: 2rem;
  }
}

.about-meta-group {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.about-meta-item .meta-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
}

.about-meta-item .meta-value {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* --------------------------------------------------------------------------
   6. Tech Stack Section
   -------------------------------------------------------------------------- */
.tech-spec-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1px;
  background-color: var(--border-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.tech-spec-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background-color: var(--bg-surface);
  transition: background-color 0.15s ease;
}

.tech-spec-row:hover {
  background-color: var(--bg-surface-elevated);
}

.tech-icon-glyph {
  color: var(--accent);
  flex-shrink: 0;
}

.tech-info {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.tech-name {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-primary);
}

.tech-category {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   7. Filter Controls
   -------------------------------------------------------------------------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.875rem;
}

.filter-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.875rem;
  min-height: 44px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  transition: all 0.15s ease;
}

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

.filter-btn.active {
  color: var(--text-primary);
  background-color: var(--bg-surface);
  border-color: var(--border-hover);
  font-weight: 600;
}

.filter-count {
  font-size: 0.75rem;
  color: var(--text-muted);
  background-color: var(--bg-surface-hover);
  padding: 0.125rem 0.375rem;
  border-radius: var(--radius-sm);
}

.filter-btn.active .filter-count {
  color: var(--accent);
  background-color: var(--accent-subtle);
}

/* --------------------------------------------------------------------------
   8. Experiments & Datasets
   -------------------------------------------------------------------------- */
.research-list {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--bg-surface);
}

.research-item-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  padding: 1.5rem;
  border-bottom: 1px solid var(--border-color);
  transition: background-color 0.15s ease;
}

.research-item-row:last-child {
  border-bottom: none;
}

.research-item-row:hover {
  background-color: var(--bg-surface-elevated);
}

@media (min-width: 768px) {
  .research-item-row {
    grid-template-columns: 2fr 1fr;
    align-items: center;
    gap: 2rem;
  }
}

.research-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.research-status {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
}

.status-maintained {
  color: var(--status-maintained);
  background-color: var(--status-maintained-bg);
}

.status-tooling {
  color: var(--status-tooling);
  background-color: var(--status-tooling-bg);
}

.status-planned {
  color: var(--status-planned);
  background-color: var(--status-planned-bg);
}

.research-category {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.research-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.375rem;
  letter-spacing: -0.02em;
}

.research-desc {
  font-size: 0.9375rem;
  line-height: 1.55;
  color: var(--text-secondary);
}

.research-meta {
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
}

@media (min-width: 768px) {
  .research-meta {
    align-items: flex-end;
  }
}

.research-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
  list-style: none;
}

.research-tag {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-muted);
  background-color: var(--bg-surface-hover);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s ease;
}

.research-tag:hover {
  color: var(--text-primary);
  background-color: var(--border-hover);
}

.research-link-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--accent);
  padding: 0.375rem 0.625rem;
  border-radius: var(--radius-sm);
  min-height: 44px;
}

.research-link-btn:hover {
  color: var(--accent-hover);
  background-color: var(--accent-subtle);
}

/* --------------------------------------------------------------------------
   9. Projects Section
   -------------------------------------------------------------------------- */
.projects-matrix {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

@media (min-width: 768px) {
  .projects-matrix {
    grid-template-columns: repeat(2, 1fr);
  }
}

.project-item {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border: 1px solid var(--border-color);
  background-color: var(--bg-surface);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.project-item:hover {
  border-color: var(--border-hover);
  background-color: var(--bg-surface-elevated);
}

.project-item-featured {
  grid-column: 1 / -1;
  border-color: var(--accent-border);
  background-color: var(--bg-surface);
}

.project-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.75rem;
}

.project-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.project-badge-featured {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--accent);
  background-color: var(--accent-subtle);
  border: 1px solid var(--accent-border);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.project-desc {
  font-size: 0.9375rem;
  line-height: 1.55;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
}

.project-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  border-top: 1px solid var(--border-color);
  padding-top: 1rem;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
  list-style: none;
}

.project-tag {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--text-muted);
  background-color: var(--bg-surface-hover);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s ease;
}

.project-tag:hover {
  color: var(--text-primary);
  background-color: var(--border-hover);
}

.project-links {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.project-link-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-primary);
  padding: 0.375rem 0.625rem;
  border-radius: var(--radius-sm);
  min-height: 44px;
  transition: color 0.15s ease;
}

.project-link-btn:hover {
  color: var(--accent);
}

.project-demo-btn {
  color: var(--accent);
}

.filter-empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 3rem 1.5rem;
  text-align: center;
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-md);
  margin-top: 1rem;
}

.filter-empty-state .empty-text {
  font-size: 0.9375rem;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   10. Connect Section
   -------------------------------------------------------------------------- */
.connect-matrix {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background-color: var(--border-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
}

@media (min-width: 640px) {
  .connect-matrix {
    grid-template-columns: repeat(2, 1fr);
  }
}

.connect-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.5rem;
  background-color: var(--bg-surface);
  transition: background-color 0.15s ease;
  min-height: 44px;
}

.connect-item:hover {
  background-color: var(--bg-surface-elevated);
}

.connect-channel-info {
  display: flex;
  align-items: center;
  gap: 0.875rem;
}

.connect-channel-glyph {
  color: var(--accent);
  flex-shrink: 0;
}

.connect-label-group {
  display: flex;
  flex-direction: column;
}

.connect-platform {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.connect-handle {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-primary);
}

.connect-actions-cell {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.connect-copy-pill {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  background-color: var(--accent-subtle);
  border: 1px solid var(--accent-border);
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
  transition: all 0.15s ease;
}

.connect-copy-pill.copied {
  color: #FFFFFF;
  background-color: var(--status-maintained);
  border-color: var(--status-maintained);
}

.connect-action-icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  min-width: 44px;
  min-height: 44px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background-color: var(--bg-primary);
  color: var(--text-secondary);
  transition: all 0.15s ease;
}

.connect-action-icon-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-hover);
  background-color: var(--bg-surface-elevated);
}

/* --------------------------------------------------------------------------
   11. Footer
   -------------------------------------------------------------------------- */
.site-footer {
  border-top: 1px solid var(--border-color);
  padding-top: 2.5rem;
  padding-bottom: 2.5rem;
  background-color: var(--bg-surface);
  font-size: 0.875rem;
}

.footer-content {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 0;
}

@media (min-width: 640px) {
  .footer-content {
    flex-direction: row;
  }
}

.footer-brand {
  font-family: var(--font-mono);
  color: var(--text-secondary);
}

.footer-spec {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   12. Notification Toast
   -------------------------------------------------------------------------- */
.copy-toast {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.625rem;
  background-color: var(--text-primary);
  color: var(--bg-primary);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.2);
  z-index: 1000;
  opacity: 0;
  transform: translateY(0.75rem);
  pointer-events: none;
  transition: opacity 0.2s cubic-bezier(0.16, 1, 0.3, 1), transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.copy-toast.show {
  opacity: 1;
  transform: translateY(0);
}