/* ==========================================================================
   ychenzgithub Open Source Hub - Modern Design System
   ========================================================================== */

:root {
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: 'JetBrains Mono', SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Dark Theme (Default) */
  --bg-body: #0b0f19;
  --bg-surface: #111827;
  --bg-card: rgba(22, 31, 48, 0.75);
  --bg-card-hover: rgba(30, 41, 64, 0.9);
  --bg-glass: rgba(17, 24, 39, 0.85);
  --bg-input: #1f293d;

  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --text-subtle: #6b7280;

  --border-color: rgba(255, 255, 255, 0.08);
  --border-color-hover: rgba(16, 185, 129, 0.35);

  --accent-emerald: #10b981;
  --accent-emerald-light: #34d399;
  --accent-emerald-bg: rgba(16, 185, 129, 0.12);

  --accent-cyan: #06b6d4;
  --accent-cyan-bg: rgba(6, 182, 212, 0.12);

  --accent-blue: #3b82f6;
  --accent-blue-bg: rgba(59, 130, 246, 0.12);

  --accent-amber: #f59e0b;
  --accent-amber-bg: rgba(245, 158, 11, 0.12);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.45);
  --glow-emerald: 0 0 25px rgba(16, 185, 129, 0.18);

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;

  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
  --bg-body: #f8fafc;
  --bg-surface: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.9);
  --bg-card-hover: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.88);
  --bg-input: #f1f5f9;

  --text-main: #0f172a;
  --text-muted: #475569;
  --text-subtle: #94a3b8;

  --border-color: rgba(0, 0, 0, 0.08);
  --border-color-hover: rgba(16, 185, 129, 0.45);

  --accent-emerald: #059669;
  --accent-emerald-light: #10b981;
  --accent-emerald-bg: rgba(5, 150, 105, 0.1);

  --accent-cyan: #0891b2;
  --accent-cyan-bg: rgba(8, 145, 178, 0.1);

  --accent-blue: #2563eb;
  --accent-blue-bg: rgba(37, 99, 235, 0.1);

  --accent-amber: #d97706;
  --accent-amber-bg: rgba(217, 119, 6, 0.1);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.08);
  --glow-emerald: 0 0 25px rgba(5, 150, 105, 0.15);
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-body);
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  overflow-x: hidden;
  background-image:
    radial-gradient(circle at 15% 10%, rgba(16, 185, 129, 0.06) 0%, transparent 40%),
    radial-gradient(circle at 85% 30%, rgba(6, 182, 212, 0.05) 0%, transparent 45%),
    radial-gradient(circle at 50% 80%, rgba(59, 130, 246, 0.04) 0%, transparent 50%);
  background-attachment: fixed;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

img {
  max-width: 100%;
  display: block;
}

.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  transition: background var(--transition-normal), border-color var(--transition-normal);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.25rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.brand-avatar {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 50%;
  border: 2px solid var(--accent-emerald);
  object-fit: cover;
}

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

.brand-name {
  color: var(--text-main);
  line-height: 1.2;
}

.brand-title {
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--accent-emerald);
  letter-spacing: 0.02em;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  list-style: none;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--transition-fast);
  padding: 0.4rem 0.2rem;
  position: relative;
}

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

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent-emerald);
  border-radius: 2px;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  width: 2.4rem;
  height: 2.4rem;
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: 0.95rem;
}

.btn-icon:hover {
  color: var(--text-main);
  border-color: var(--border-color-hover);
  background: var(--bg-card-hover);
}

.btn-lang {
  width: auto;
  padding: 0 0.75rem;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.03em;
}

/* Mobile Nav Toggle */
.mobile-nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 1.4rem;
  cursor: pointer;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero-section {
  padding: 4.5rem 0 3.5rem;
  position: relative;
}

.hero-wrapper {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 3rem;
  align-items: center;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.9rem;
  border-radius: var(--radius-full);
  background: var(--accent-emerald-bg);
  border: 1px solid rgba(16, 185, 129, 0.25);
  color: var(--accent-emerald-light);
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
}

.hero-pill .pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-emerald);
  box-shadow: 0 0 8px var(--accent-emerald);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
  100% { opacity: 1; transform: scale(1); }
}

.hero-title {
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 1rem;
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, var(--accent-emerald-light) 0%, var(--accent-cyan) 60%, var(--accent-blue) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-bottom: 1.25rem;
  line-height: 1.4;
}

.hero-affiliation {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.hero-affiliation i {
  color: var(--accent-amber);
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 680px;
  margin-bottom: 2rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.75rem 1.4rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.92rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--accent-emerald);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(16, 185, 129, 0.35);
}

.btn-primary:hover {
  background: var(--accent-emerald-light);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(16, 185, 129, 0.45);
}

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

.btn-secondary:hover {
  border-color: var(--border-color-hover);
  background: var(--bg-card-hover);
  transform: translateY(-1px);
}

.hero-avatar-card {
  position: relative;
  text-align: center;
}

.avatar-wrapper {
  position: relative;
  width: 210px;
  height: 210px;
  margin: 0 auto;
}

.hero-avatar-img {
  width: 100%;
  height: 100%;
  border-radius: 28px;
  object-fit: cover;
  border: 3px solid rgba(255, 255, 255, 0.1);
  box-shadow: var(--shadow-lg), var(--glow-emerald);
  position: relative;
  z-index: 2;
}

.avatar-badge {
  position: absolute;
  bottom: -10px;
  right: -10px;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  padding: 0.4rem 0.85rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-emerald);
  box-shadow: var(--shadow-md);
  z-index: 3;
}

/* Stats Counter Bar */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  padding: 1.75rem 2rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
  margin-top: 1rem;
}

.stat-item {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.stat-icon {
  width: 3rem;
  height: 3rem;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
}

.stat-icon.emerald { background: var(--accent-emerald-bg); color: var(--accent-emerald); }
.stat-icon.cyan { background: var(--accent-cyan-bg); color: var(--accent-cyan); }
.stat-icon.blue { background: var(--accent-blue-bg); color: var(--accent-blue); }
.stat-icon.amber { background: var(--accent-amber-bg); color: var(--accent-amber); }

.stat-num {
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--text-main);
}

.stat-label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
}

/* ==========================================================================
   Section Headers
   ========================================================================== */
.section-header {
  margin-bottom: 2.5rem;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent-emerald);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.5rem;
}

.section-title {
  font-size: 2.15rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-main);
  line-height: 1.25;
}

.section-desc {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 680px;
  margin-top: 0.5rem;
}

/* ==========================================================================
   Featured Live Web Apps Section
   ========================================================================== */
.featured-section {
  padding: 4.5rem 0;
  border-top: 1px solid var(--border-color);
}

.featured-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 1.75rem;
}

.featured-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
  backdrop-filter: blur(12px);
  position: relative;
}

.featured-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-color-hover);
  box-shadow: var(--shadow-lg), var(--glow-emerald);
}

.featured-card.large {
  grid-column: span 6;
}

.featured-card.medium {
  grid-column: span 6;
}

.featured-card.third {
  grid-column: span 4;
}

.card-media {
  position: relative;
  width: 100%;
  height: 200px;
  overflow: hidden;
  background: var(--bg-surface);
}

.card-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.featured-card:hover .card-media img {
  transform: scale(1.04);
}

/* Screenshots with text: show the whole image instead of cropping it */
.card-media.fit-contain img {
  object-fit: contain;
}

.media-badge {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: rgba(11, 15, 25, 0.85);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-full);
  padding: 0.3rem 0.75rem;
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--accent-emerald-light);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.media-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.08) 0%, rgba(6, 182, 212, 0.12) 100%);
  color: var(--accent-cyan);
}

.media-placeholder i {
  font-size: 3rem;
}

.media-placeholder.food {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.1) 0%, rgba(239, 68, 68, 0.1) 100%);
  color: var(--accent-amber);
}

.media-placeholder.geo {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, rgba(59, 130, 246, 0.1) 100%);
  color: var(--accent-emerald);
}

.media-placeholder.crypto {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(168, 85, 247, 0.1) 100%);
  color: #a855f7;
}

.media-placeholder.climate {
  background: linear-gradient(135deg, rgba(14, 165, 233, 0.1) 0%, rgba(16, 185, 129, 0.1) 100%);
  color: #0ea5e9;
}

.card-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.85rem;
}

.tag-pill {
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  font-size: 0.73rem;
  font-weight: 500;
  color: var(--text-muted);
}

.card-title {
  font-size: 1.28rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.35;
  margin-bottom: 0.6rem;
}

.card-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 1.5rem;
  flex: 1;
}

.card-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: auto;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
}

.btn-card-launch {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.6rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.86rem;
  font-weight: 600;
  background: var(--accent-emerald-bg);
  color: var(--accent-emerald-light);
  border: 1px solid rgba(16, 185, 129, 0.3);
  transition: all var(--transition-fast);
}

.btn-card-launch:hover {
  background: var(--accent-emerald);
  color: #ffffff;
}

.btn-card-code {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.6rem 0.9rem;
  border-radius: var(--radius-md);
  font-size: 0.86rem;
  font-weight: 500;
  background: var(--bg-surface);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  transition: all var(--transition-fast);
}

.btn-card-code:hover {
  color: var(--text-main);
  border-color: var(--border-color-hover);
}

/* ==========================================================================
   Research & Scientific Tools Spotlight
   ========================================================================== */
.science-section {
  padding: 4.5rem 0;
  border-top: 1px solid var(--border-color);
  background: linear-gradient(180deg, transparent 0%, rgba(16, 185, 129, 0.02) 50%, transparent 100%);
}

.science-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.75rem;
}

.science-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
  backdrop-filter: blur(12px);
  position: relative;
}

.science-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-color-hover);
  box-shadow: var(--shadow-lg);
}

.science-icon-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}

.science-icon {
  width: 3.2rem;
  height: 3.2rem;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  background: var(--accent-emerald-bg);
  color: var(--accent-emerald);
}

.science-badge {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--accent-cyan);
}

.science-image-box {
  width: 100%;
  height: 160px;
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 1.25rem;
  border: 1px solid var(--border-color);
  background: var(--bg-surface);
}

.science-image-box img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.science-title {
  font-size: 1.22rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.6rem;
  line-height: 1.35;
}

.science-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 1.25rem;
  flex: 1;
}

.science-features {
  list-style: none;
  margin-bottom: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.science-features li {
  font-size: 0.82rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.science-features li i {
  color: var(--accent-emerald);
  font-size: 0.75rem;
}

/* ==========================================================================
   Full Repository Explorer
   ========================================================================== */
.repos-section {
  padding: 4.5rem 0;
  border-top: 1px solid var(--border-color);
}

.repo-toolbar {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-bottom: 2.25rem;
}

.search-box {
  position: relative;
  width: 100%;
}

.search-box i {
  position: absolute;
  left: 1.15rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-subtle);
  font-size: 1rem;
}

.search-input {
  width: 100%;
  padding: 0.85rem 1.15rem 0.85rem 2.85rem;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-main);
  font-size: 0.95rem;
  font-family: inherit;
  outline: none;
  transition: all var(--transition-fast);
}

.search-input:focus {
  border-color: var(--accent-emerald);
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.15);
}

.toolbar-filters {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.category-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.filter-tab {
  padding: 0.5rem 1rem;
  border-radius: var(--radius-full);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-tab:hover {
  color: var(--text-main);
  border-color: var(--border-color-hover);
}

.filter-tab.active {
  background: var(--accent-emerald);
  color: #ffffff;
  border-color: var(--accent-emerald);
  box-shadow: 0 2px 10px rgba(16, 185, 129, 0.3);
}

.sort-wrapper {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.sort-select {
  padding: 0.45rem 0.85rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-main);
  font-family: inherit;
  font-size: 0.85rem;
  outline: none;
  cursor: pointer;
}

.repos-count-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.repos-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 1.5rem;
}

.repo-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
  backdrop-filter: blur(8px);
}

.repo-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-color-hover);
  box-shadow: var(--shadow-md);
}

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

.repo-title-group {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.repo-icon {
  font-size: 1.25rem;
}

.repo-name {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.01em;
}

.repo-badges {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.badge-live {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-emerald-light);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.repo-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 1.25rem;
  flex: 1;
}

.repo-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-muted);
  padding-top: 0.9rem;
  border-top: 1px solid var(--border-color);
  margin-top: auto;
}

.meta-lang {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 500;
}

.lang-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
}

.lang-dot.python { background: #3572A5; }
.lang-dot.javascript { background: #f1e05a; }
.lang-dot.typescript { background: #3178c6; }
.lang-dot.jupyter { background: #DA5B0B; }
.lang-dot.markdown { background: #0891b2; }
.lang-dot.html { background: #e34c26; }

.meta-stats {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.meta-stats span {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.repo-card-footer {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-top: 0.9rem;
}

.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 3.5rem 1rem;
  color: var(--text-muted);
}

.empty-state i {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  color: var(--text-subtle);
}

/* ==========================================================================
   About & Research Section
   ========================================================================== */
.about-section {
  padding: 4.5rem 0;
  border-top: 1px solid var(--border-color);
}

.about-grid {
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: 3rem;
  align-items: center;
}

.about-text p {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 1.25rem;
}

.about-highlights {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.highlight-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.highlight-icon {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-md);
  background: var(--accent-emerald-bg);
  color: var(--accent-emerald);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.highlight-content h4 {
  font-size: 0.95rem;
  color: var(--text-main);
  margin-bottom: 0.25rem;
}

.highlight-content p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin: 0;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  padding: 3.5rem 0 2rem;
  border-top: 1px solid var(--border-color);
  background: var(--bg-surface);
  color: var(--text-muted);
  font-size: 0.88rem;
}

.footer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2rem;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.footer-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
}

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

.footer-links a:hover {
  color: var(--accent-emerald);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
  font-size: 0.8rem;
  color: var(--text-subtle);
  flex-wrap: wrap;
  gap: 1rem;
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-wrapper {
    grid-template-columns: 1fr;
    text-align: left;
  }
  .hero-avatar-card {
    order: -1;
    margin-bottom: 1.5rem;
    text-align: left;
  }
  .avatar-wrapper {
    margin: 0;
    width: 160px;
    height: 160px;
  }
  .featured-card.large,
  .featured-card.medium,
  .featured-card.third {
    grid-column: span 12;
  }
  .science-grid {
    grid-template-columns: 1fr;
  }
  .about-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2.25rem;
  }
  .stats-bar {
    grid-template-columns: repeat(2, 1fr);
  }
  .nav-menu {
    display: none;
  }
  .mobile-nav-toggle {
    display: block;
  }
  .repos-grid {
    grid-template-columns: 1fr;
  }
  .toolbar-filters {
    flex-direction: column;
    align-items: stretch;
  }
}