/* ==========================================================================
   MURTAZA ALI KHAN — AI & DATA SCIENCE ENGINEER PORTFOLIO
   Design System & Styling
   Palette: Obsidian Black (#141414), Deep Amethyst (#361942), Velvet Purple (#5A376F),
            Warm Ochre (#B58763), Forest Green (#153225), Sage Green (#3E5F52)
   ========================================================================== */

:root {
  /* Color Tokens */
  --bg-dark: #0a0b0e;
  --bg-obsidian: #141414;
  --bg-surface: #17181e;
  --bg-surface-elevated: #20212b;
  --bg-card: rgba(23, 24, 30, 0.72);
  --bg-card-hover: rgba(32, 33, 43, 0.88);
  --bg-glass: rgba(14, 15, 20, 0.78);
  
  /* Brand Accents */
  --color-amethyst: #361942;
  --color-purple: #5A376F;
  --color-purple-light: #8352a1;
  --color-purple-glow: rgba(90, 55, 111, 0.35);
  --color-ochre: #B58763;
  --color-ochre-light: #cf9f7a;
  --color-ochre-glow: rgba(181, 135, 99, 0.28);
  --color-forest: #153225;
  --color-sage: #3E5F52;
  --color-cyan: #38bdf8;
  --color-cyan-glow: rgba(56, 189, 248, 0.25);
  --color-emerald: #10b981;
  
  /* Text */
  --text-main: #f4f4f6;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;
  --text-dim: #52525b;

  /* Borders & Shadows */
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-highlight: rgba(181, 135, 99, 0.3);
  --border-glow-purple: rgba(90, 55, 111, 0.45);
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.65);
  --shadow-glow: 0 0 35px var(--color-purple-glow);
  --shadow-ochre-glow: 0 0 30px var(--color-ochre-glow);

  /* Dimensions & Radii */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 32px;
  --radius-full: 9999px;
  --container-max: 1240px;

  /* Typography */
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Transitions */
  --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-dark);
  color: var(--text-main);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

::selection {
  background-color: var(--color-purple);
  color: #ffffff;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-dark);
}
::-webkit-scrollbar-thumb {
  background: #272832;
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-purple);
}

/* Typography Helpers */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-main);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

a {
  color: inherit;
  text-decoration: none;
}

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

/* Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

/* Neural Network Background Canvas */
#neural-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  opacity: 0.65;
}

/* Ambient Radial Glows */
.ambient-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.28;
}

.ambient-glow-1 {
  top: 5%;
  left: 15%;
  width: 480px;
  height: 480px;
  background: radial-gradient(circle, var(--color-purple) 0%, transparent 70%);
}

.ambient-glow-2 {
  top: 25%;
  right: 10%;
  width: 520px;
  height: 520px;
  background: radial-gradient(circle, var(--color-ochre) 0%, transparent 70%);
}

.ambient-glow-3 {
  top: 60%;
  left: 5%;
  width: 450px;
  height: 450px;
  background: radial-gradient(circle, var(--color-forest) 0%, transparent 70%);
}

/* ==========================================================================
   NAVIGATION
   ========================================================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background: var(--bg-glass);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border-subtle);
  transition: all var(--transition-normal);
}

.navbar.scrolled {
  background: rgba(10, 11, 14, 0.92);
  border-bottom-color: rgba(255, 255, 255, 0.12);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

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

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: -0.02em;
}

.nav-avatar-mini {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  object-fit: cover;
  border: 1.5px solid var(--color-ochre);
}

.pulse-dot-wrapper {
  position: relative;
  display: flex;
  width: 8px;
  height: 8px;
}

.pulse-dot-ping {
  position: absolute;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background-color: var(--color-emerald);
  opacity: 0.75;
  animation: ping 1.5s cubic-bezier(0, 0, 0.2, 1) infinite;
}

.pulse-dot-core {
  position: relative;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-emerald);
}

@keyframes ping {
  75%, 100% {
    transform: scale(2.2);
    opacity: 0;
  }
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: #ffffff;
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--color-ochre);
  border-radius: 2px;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.btn-nav-cta {
  background: linear-gradient(135deg, var(--color-ochre), #936341);
  color: #ffffff;
  padding: 0.55rem 1.25rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  box-shadow: 0 4px 14px var(--color-ochre-glow);
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.btn-nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(181, 135, 99, 0.45);
  color: #ffffff;
}

/* Mobile Toggle */
.menu-toggle {
  display: none;
  background: transparent;
  border: none;
  color: var(--text-main);
  cursor: pointer;
  padding: 0.5rem;
}

.menu-toggle svg {
  width: 24px;
  height: 24px;
}

/* Mobile Drawer */
.mobile-drawer {
  display: none;
  position: fixed;
  top: 4.25rem;
  left: 0;
  width: 100%;
  background: rgba(14, 15, 20, 0.98);
  backdrop-filter: blur(25px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 1.5rem;
  flex-direction: column;
  gap: 1.25rem;
  z-index: 99;
  transform: translateY(-10px);
  opacity: 0;
  transition: all var(--transition-normal);
}

.mobile-drawer.open {
  display: flex;
  transform: translateY(0);
  opacity: 1;
}

.mobile-drawer a {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-secondary);
  padding: 0.5rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.mobile-drawer a:hover {
  color: var(--color-ochre);
}

/* ==========================================================================
   BUTTONS & BADGES
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.75rem 1.6rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-normal);
  border: 1px solid transparent;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-ochre) 0%, #8e5e39 100%);
  color: #ffffff;
  box-shadow: 0 4px 18px var(--color-ochre-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(181, 135, 99, 0.5);
  background: linear-gradient(135deg, #c59670 0%, #9a6842 100%);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-main);
  border-color: var(--border-subtle);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.09);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

.btn-purple {
  background: linear-gradient(135deg, var(--color-purple) 0%, var(--color-amethyst) 100%);
  color: #ffffff;
  border: 1px solid rgba(131, 82, 161, 0.3);
  box-shadow: 0 4px 18px var(--color-purple-glow);
}

.btn-purple:hover {
  background: linear-gradient(135deg, #6c4285 0%, #462256 100%);
  transform: translateY(-2px);
  box-shadow: 0 8px 26px rgba(131, 82, 161, 0.5);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.badge-ochre {
  background: rgba(181, 135, 99, 0.12);
  color: var(--color-ochre-light);
  border: 1px solid rgba(181, 135, 99, 0.3);
}

.badge-purple {
  background: rgba(90, 55, 111, 0.18);
  color: #c084fc;
  border: 1px solid rgba(147, 85, 185, 0.35);
}

.badge-cyan {
  background: rgba(56, 189, 248, 0.12);
  color: #7dd3fc;
  border: 1px solid rgba(56, 189, 248, 0.28);
}

.badge-emerald {
  background: rgba(16, 185, 129, 0.12);
  color: #6ee7b7;
  border: 1px solid rgba(16, 185, 129, 0.28);
}

/* Bento Card Style */
.bento-card {
  position: relative;
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  overflow: hidden;
  transition: all var(--transition-normal);
  z-index: 1;
}

.bento-card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(181, 135, 99, 0.25);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

/* ==========================================================================
   HERO SECTION
   ========================================================================== */
.hero-section {
  position: relative;
  padding-top: 8.5rem;
  padding-bottom: 5.5rem;
  z-index: 1;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.25fr 0.95fr;
  gap: 3.5rem;
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.hero-status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.4rem 1rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-secondary);
  width: fit-content;
}

.hero-status-dot {
  width: 7px;
  height: 7px;
  background: var(--color-emerald);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--color-emerald);
}

.hero-title {
  font-size: clamp(2.5rem, 5.2vw, 4.25rem);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.04em;
}

.hero-title-gradient {
  background: linear-gradient(135deg, #ffffff 30%, var(--color-ochre-light) 75%, var(--color-purple-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 600px;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  margin-top: 0.75rem;
}

.hero-stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-subtle);
  margin-top: 1rem;
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-value {
  font-size: 1.75rem;
  font-weight: 800;
  font-family: var(--font-sans);
  color: #ffffff;
  letter-spacing: -0.03em;
}

.stat-value span {
  color: var(--color-ochre);
}

.stat-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

/* Hero Visual / Avatar Card */
.hero-visual-card {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.avatar-halo {
  position: absolute;
  width: 380px;
  height: 380px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--color-purple) 0%, rgba(181, 135, 99, 0.4) 60%, transparent 80%);
  filter: blur(55px);
  opacity: 0.55;
  animation: pulse-glow 6s ease-in-out infinite alternate;
}

@keyframes pulse-glow {
  0% { transform: scale(0.92); opacity: 0.45; }
  100% { transform: scale(1.08); opacity: 0.7; }
}

.avatar-frame {
  position: relative;
  width: 320px;
  height: 380px;
  border-radius: var(--radius-xl);
  padding: 4px;
  background: linear-gradient(145deg, rgba(181, 135, 99, 0.6), rgba(90, 55, 111, 0.5), rgba(255, 255, 255, 0.1));
  box-shadow: var(--shadow-lg), 0 0 40px rgba(90, 55, 111, 0.35);
  overflow: hidden;
}

.avatar-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 20%;
  border-radius: calc(var(--radius-xl) - 4px);
  filter: brightness(1.02) contrast(1.04);
  transition: transform var(--transition-slow);
}

.avatar-frame:hover .avatar-img {
  transform: scale(1.04);
}

.floating-badge {
  position: absolute;
  background: rgba(14, 15, 20, 0.88);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-subtle);
  padding: 0.65rem 1.1rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-size: 0.85rem;
  font-weight: 600;
  z-index: 2;
  animation: float 4s ease-in-out infinite alternate;
}

.badge-top-left {
  top: -15px;
  left: -20px;
  border-color: rgba(56, 189, 248, 0.3);
}

.badge-bottom-right {
  bottom: -20px;
  right: -20px;
  border-color: rgba(181, 135, 99, 0.4);
  animation-delay: -2s;
}

@keyframes float {
  0% { transform: translateY(0); }
  100% { transform: translateY(-8px); }
}

.badge-icon-box {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.08);
}

/* ==========================================================================
   SECTION HEADERS
   ========================================================================== */
.section {
  padding-top: 5.5rem;
  padding-bottom: 5.5rem;
  position: relative;
  z-index: 1;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 3.5rem;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-ochre);
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: clamp(2rem, 3.8vw, 3.25rem);
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.15;
  margin-bottom: 1rem;
}

.section-desc {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   FEATURED BANNER / HERO HIGHLIGHT
   ========================================================================== */
.featured-hero-banner {
  margin-bottom: 4rem;
  border-radius: var(--radius-xl);
  border: 1px solid rgba(181, 135, 99, 0.25);
  background: linear-gradient(135deg, rgba(54, 25, 66, 0.4) 0%, rgba(20, 20, 24, 0.8) 100%);
  overflow: hidden;
  box-shadow: var(--shadow-lg), 0 0 50px rgba(90, 55, 111, 0.2);
}

.featured-banner-grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  align-items: center;
}

.featured-banner-info {
  padding: 3rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.featured-banner-img-wrap {
  position: relative;
  height: 100%;
  min-height: 380px;
  overflow: hidden;
  background: #090a0d;
}

.featured-banner-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.featured-hero-banner:hover .featured-banner-img {
  transform: scale(1.03);
}

/* ==========================================================================
   PROJECTS SECTION & FILTERS
   ========================================================================== */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.6rem;
  margin-bottom: 2.75rem;
}

.filter-btn {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  padding: 0.55rem 1.25rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.15);
}

.filter-btn.active {
  background: var(--color-ochre);
  color: #ffffff;
  border-color: var(--color-ochre);
  box-shadow: 0 4px 15px var(--color-ochre-glow);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 1.75rem;
}

.project-card {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.project-img-wrap {
  position: relative;
  width: 100%;
  height: 220px;
  background: #0d0e12;
  overflow: hidden;
}

.project-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-normal);
}

.project-card:hover .project-img {
  transform: scale(1.06);
}

.project-overlay-badge {
  position: absolute;
  top: 1rem;
  left: 1rem;
  z-index: 2;
}

.project-body {
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.project-title {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 0.75rem;
  transition: color var(--transition-fast);
}

.project-card:hover .project-title {
  color: var(--color-ochre-light);
}

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

.project-specs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1.5rem;
}

.spec-pill {
  font-size: 0.725rem;
  font-weight: 600;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-secondary);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

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

.project-link-btn {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-ochre-light);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: all var(--transition-fast);
}

.project-link-btn:hover {
  color: #ffffff;
  transform: translateX(3px);
}

.project-btn-detail {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.06);
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-subtle);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.project-btn-detail:hover {
  background: rgba(255, 255, 255, 0.12);
  color: #ffffff;
}

/* ==========================================================================
   GITHUB ACTIVITY & CONTRIBUTIONS MATRIX
   ========================================================================== */
.github-card {
  padding: 2.5rem;
  background: linear-gradient(145deg, rgba(20, 20, 24, 0.9) 0%, rgba(27, 28, 36, 0.7) 100%);
  border: 1px solid var(--border-subtle);
}

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

.github-user-info {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.github-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 2px solid var(--color-ochre);
  object-fit: cover;
}

.github-name {
  font-size: 1.2rem;
  font-weight: 700;
}

.github-handle {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.github-year-switcher {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(0, 0, 0, 0.4);
  padding: 0.3rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-subtle);
}

.year-btn {
  padding: 0.4rem 1rem;
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  border: none;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.year-btn.active {
  background: var(--color-purple);
  color: #ffffff;
  box-shadow: 0 2px 10px var(--color-purple-glow);
}

/* Heatmap Grid */
.heatmap-container-outer {
  overflow-x: auto;
  padding-bottom: 1rem;
  scrollbar-width: thin;
}

.heatmap-scroll-wrapper {
  min-width: 780px;
}

.heatmap-months-row {
  display: flex;
  justify-content: space-between;
  padding-left: 28px;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.heatmap-grid-layout {
  display: flex;
  gap: 4px;
}

.heatmap-days-col {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  font-size: 0.65rem;
  color: var(--text-muted);
  height: 98px;
  width: 24px;
  padding-top: 4px;
}

.heatmap-weeks-container {
  display: flex;
  gap: 4px;
  flex-grow: 1;
}

.heatmap-week {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.heatmap-cell {
  width: 12px;
  height: 12px;
  border-radius: 2.5px;
  background-color: #1b1f24;
  transition: transform 0.15s ease, outline 0.15s ease;
  cursor: pointer;
}

.heatmap-cell:hover {
  transform: scale(1.35);
  outline: 1.5px solid #ffffff;
  z-index: 10;
}

/* Color levels */
.level-0 { background-color: #161b22; }
.level-1 { background-color: #0e4429; }
.level-2 { background-color: #006d32; }
.level-3 { background-color: #26a641; }
.level-4 { background-color: #39d353; }

.heatmap-legend-row {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.5rem;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 1rem;
}

.heatmap-legend-cells {
  display: flex;
  gap: 3px;
}

.heatmap-legend-cell {
  width: 11px;
  height: 11px;
  border-radius: 2px;
}

.github-stats-footer {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1.25rem;
  margin-top: 2rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--border-subtle);
}

.github-stat-card {
  background: rgba(0, 0, 0, 0.3);
  padding: 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.04);
}

.github-stat-num {
  font-size: 1.6rem;
  font-weight: 800;
  color: #ffffff;
  letter-spacing: -0.02em;
}

.github-stat-desc {
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-top: 0.2rem;
}

/* Tooltip */
.heatmap-tooltip {
  position: fixed;
  background: rgba(14, 15, 20, 0.95);
  backdrop-filter: blur(10px);
  color: #ffffff;
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-family: var(--font-sans);
  pointer-events: none;
  z-index: 999;
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-sm);
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.heatmap-tooltip.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ==========================================================================
   INTERACTIVE MODEL DIAGNOSTICS & STUDIO
   ========================================================================== */
.model-studio-card {
  padding: 2.75rem;
  background: linear-gradient(135deg, rgba(20, 21, 28, 0.95) 0%, rgba(14, 15, 20, 0.9) 100%);
  border: 1px solid var(--border-subtle);
}

.model-interactive-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-top: 2rem;
}

.model-column {
  background: rgba(0, 0, 0, 0.35);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.model-column.rf {
  border-color: rgba(56, 189, 248, 0.25);
}

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

.model-score-display {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.score-num {
  font-size: 2.75rem;
  font-weight: 800;
  letter-spacing: -0.04em;
}

.score-num.linear { color: #38bdf8; }
.score-num.rf { color: #4ade80; }

.score-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.model-feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.model-feature-list li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.model-feature-list li svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.interactive-slider-box {
  background: rgba(255, 255, 255, 0.03);
  padding: 1.5rem;
  border-radius: var(--radius-md);
  margin-top: 2rem;
  border: 1px solid var(--border-subtle);
}

.slider-label-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.75rem;
  font-size: 0.85rem;
  font-weight: 600;
}

.slider-input {
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: #2a2b36;
  outline: none;
  -webkit-appearance: none;
  appearance: none;
  cursor: pointer;
}

.slider-input::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--color-ochre);
  cursor: pointer;
  box-shadow: 0 0 10px var(--color-ochre);
}

/* ==========================================================================
   1-ON-1 AI & PYTHON MENTORSHIP
   ========================================================================== */
.mentorship-card {
  padding: 0;
  overflow: hidden;
  border: 1px solid rgba(181, 135, 99, 0.3);
  background: linear-gradient(135deg, rgba(23, 24, 30, 0.95) 0%, rgba(54, 25, 66, 0.3) 100%);
  box-shadow: var(--shadow-lg), 0 0 45px rgba(181, 135, 99, 0.15);
}

.mentorship-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: stretch;
}

.mentorship-content {
  padding: 3.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 1.5rem;
}

.mentorship-pillars {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 0.5rem;
}

.pillar-box {
  background: rgba(0, 0, 0, 0.35);
  border-radius: var(--radius-md);
  padding: 1.15rem;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.pillar-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 0.35rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.pillar-desc {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.45;
}

.mentorship-visual-wrap {
  position: relative;
  min-height: 420px;
  overflow: hidden;
  background: #090a0e;
}

.mentorship-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.mentorship-card:hover .mentorship-img {
  transform: scale(1.03);
}

/* ==========================================================================
   VERIFIED CERTIFICATIONS & CREDENTIALS
   ========================================================================== */
.certs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
  gap: 2rem;
}

.cert-card {
  padding: 2.25rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1.5rem;
  background: linear-gradient(145deg, rgba(23, 24, 30, 0.85) 0%, rgba(30, 25, 38, 0.85) 100%);
  border: 1px solid var(--border-subtle);
}

.cert-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.cert-icon-box {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: rgba(181, 135, 99, 0.15);
  border: 1px solid rgba(181, 135, 99, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-ochre-light);
}

.cert-title {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 0.35rem;
}

.cert-issuer {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.cert-details-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.cert-details-list li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.cert-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-subtle);
}

/* ==========================================================================
   TECH MATRIX & DOMAINS
   ========================================================================== */
.skills-bento {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.skill-category-card {
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.skill-cat-title {
  font-size: 1.15rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.skill-chips-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.skill-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.825rem;
  font-weight: 600;
  color: var(--text-main);
  transition: all var(--transition-fast);
}

.skill-chip:hover {
  background: rgba(181, 135, 99, 0.15);
  border-color: rgba(181, 135, 99, 0.35);
  color: #ffffff;
  transform: translateY(-2px);
}

.tools-banner-wrapper {
  margin-top: 2rem;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-subtle);
  background: #ffffff;
  padding: 1.25rem;
}

.tools-banner-img {
  width: 100%;
  max-height: 180px;
  object-fit: contain;
}

/* ==========================================================================
   ABOUT & COLOR PALETTE SPOTLIGHT
   ========================================================================== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.about-text {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.about-text strong {
  color: #ffffff;
}

.palette-showcase-card {
  padding: 2rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
}

.palette-swatches-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.swatch-item {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.swatch-color {
  height: 54px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.4);
}

.swatch-name {
  font-size: 0.75rem;
  font-weight: 700;
  color: #ffffff;
}

.swatch-hex {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
}

/* ==========================================================================
   CONTACT SECTION & CHANNELS
   ========================================================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1.1fr 1.3fr;
  gap: 3rem;
}

.contact-info-col {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

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

.social-card-btn {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 1rem 1.25rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.social-card-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(181, 135, 99, 0.4);
  transform: translateY(-2px);
}

.social-icon-img {
  width: 26px;
  height: 26px;
  object-fit: contain;
  border-radius: 4px;
}

.social-card-text {
  display: flex;
  flex-direction: column;
}

.social-card-label {
  font-size: 0.875rem;
  font-weight: 700;
  color: #ffffff;
}

.social-card-sub {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.contact-form-card {
  padding: 2.5rem;
}

.form-group {
  margin-bottom: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-label {
  font-size: 0.825rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.form-input,
.form-textarea {
  width: 100%;
  background: rgba(0, 0, 0, 0.45);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  color: #ffffff;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  transition: all var(--transition-fast);
  outline: none;
}

.form-input:focus,
.form-textarea:focus {
  border-color: var(--color-ochre);
  box-shadow: 0 0 0 3px var(--color-ochre-glow);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.footer {
  border-top: 1px solid var(--border-subtle);
  padding: 3.5rem 0 2.5rem 0;
  background: var(--bg-dark);
  position: relative;
  z-index: 1;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  text-align: center;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.footer-nav a:hover {
  color: var(--color-ochre);
}

.footer-copy {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-visitors {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* ==========================================================================
   MODAL WINDOWS & TOAST
   ========================================================================== */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  z-index: 9999;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.modal-backdrop.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-dialog {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  max-width: 720px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg), 0 0 60px rgba(90, 55, 111, 0.35);
  transform: translateY(20px) scale(0.96);
  transition: transform var(--transition-normal);
  position: relative;
}

.modal-backdrop.active .modal-dialog {
  transform: translateY(0) scale(1);
}

.modal-close-btn {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-subtle);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 10;
  transition: all var(--transition-fast);
}

.modal-close-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: rotate(90deg);
}

.modal-img-wrap {
  width: 100%;
  max-height: 360px;
  overflow: hidden;
  background: #000000;
}

.modal-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.modal-body {
  padding: 2.25rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

/* Toast */
.toast-notice {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: var(--color-ochre);
  color: #ffffff;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.875rem;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
  z-index: 10000;
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

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

/* ==========================================================================
   RESPONSIVE MEDIA QUERIES
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 3rem;
  }

  .hero-status-pill {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-subtitle {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-cta-group {
    justify-content: center;
  }

  .hero-stats-row {
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
  }

  .featured-banner-grid,
  .mentorship-grid,
  .about-grid,
  .contact-grid,
  .model-interactive-grid {
    grid-template-columns: 1fr;
  }

  .featured-banner-img-wrap,
  .mentorship-visual-wrap {
    min-height: 280px;
  }
}

@media (max-width: 768px) {
  .nav-links, .btn-nav-cta {
    display: none;
  }

  .menu-toggle {
    display: block;
  }

  .hero-stats-row {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }

  .social-links-grid {
    grid-template-columns: 1fr;
  }

  .mentorship-pillars {
    grid-template-columns: 1fr;
  }

  .palette-swatches-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .avatar-frame {
    width: 260px;
    height: 310px;
  }

  .floating-badge {
    display: none;
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }
}