/* ==========================================================================
   ADARSH PANDEY - AI RESEARCHER PORTFOLIO
   Design System & Styling
   ========================================================================== */

/* --- Google Fonts Import --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&family=Plus+Jakarta+Sans:wght@500;600;700;800&display=swap');

/* --- CSS Variables / Custom Properties --- */
:root {
  /* Color Palette */
  --bg-dark: #07090e;
  --bg-card: rgba(15, 23, 42, 0.65);
  --bg-card-hover: rgba(30, 41, 59, 0.8);
  --bg-surface: #0f172a;
  --bg-elevated: #1e293b;
  
  --border-color: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(99, 102, 241, 0.3);
  --border-cyan: rgba(6, 182, 212, 0.3);
  
  --primary: #6366f1;       /* Indigo */
  --primary-light: #818cf8;
  --cyan: #06b6d4;          /* Cyan */
  --cyan-light: #22d3ee;
  --purple: #a855f7;        /* Purple */
  --emerald: #10b981;       /* Green status */
  --amber: #f59e0b;         /* Amber warning/learning */

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --font-main: 'Plus Jakarta Sans', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Shadows & Glows */
  --glow-primary: 0 0 35px rgba(99, 102, 241, 0.25);
  --glow-cyan: 0 0 35px rgba(6, 182, 212, 0.25);
  --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.5);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-main);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  position: relative;
}

/* Background Subtle Radial Glow & Grid */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: 
    radial-gradient(circle at 15% 15%, rgba(99, 102, 241, 0.08) 0%, transparent 45%),
    radial-gradient(circle at 85% 65%, rgba(6, 182, 212, 0.07) 0%, transparent 45%),
    radial-gradient(circle at 50% 90%, rgba(168, 85, 247, 0.06) 0%, transparent 50%);
  pointer-events: none;
  z-index: -2;
}

body::after {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: linear-gradient(rgba(255, 255, 255, 0.015) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255, 255, 255, 0.015) 1px, transparent 1px);
  background-size: 50px 50px;
  pointer-events: none;
  z-index: -1;
}

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

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

/* --- Container & Layout --- */
.container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

section {
  padding: 6rem 0;
  position: relative;
}

/* --- Typography Helpers --- */
.gradient-text {
  background: linear-gradient(135deg, #ffffff 20%, var(--primary-light) 60%, var(--cyan-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.gradient-text-cyan {
  background: linear-gradient(135deg, var(--cyan-light) 0%, var(--primary-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-header {
  text-align: center;
  max-width: 750px;
  margin: 0 auto 4rem auto;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 1rem;
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-full);
  color: var(--primary-light);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1rem;
}

.section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 1rem;
}

.section-subtitle {
  color: var(--text-muted);
  font-size: 1.1rem;
  font-weight: 400;
}

/* --- Glass Card Utility --- */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  transition: all var(--transition-normal);
}

.glass-card:hover {
  border-color: var(--border-glow);
  box-shadow: var(--glow-primary);
  transform: translateY(-4px);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.85rem 1.8rem;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, #4f46e5 100%);
  color: #ffffff;
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #6366f1 0%, #4338ca 100%);
  box-shadow: 0 6px 25px rgba(99, 102, 241, 0.6);
  transform: translateY(-2px);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-main);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

.btn-icon {
  width: 44px;
  height: 44px;
  padding: 0;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-main);
}

.btn-icon:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--cyan);
  color: var(--cyan-light);
  transform: translateY(-2px);
}

/* --- Navigation --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  padding: 1.2rem 0;
  transition: all var(--transition-normal);
}

.navbar.scrolled {
  padding: 0.8rem 0;
  background: rgba(7, 9, 14, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
}

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

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.01em;
  color: var(--text-main);
}

.nav-logo-badge {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--cyan) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: #fff;
  box-shadow: 0 0 15px rgba(99, 102, 241, 0.4);
}

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

.nav-link {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
  color: var(--cyan-light);
}

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

.mobile-toggle {
  display: none;
  font-size: 1.5rem;
  color: var(--text-main);
}

/* Mobile Drawer */
.mobile-menu {
  position: fixed;
  top: 0;
  right: -100%;
  width: 80%;
  max-width: 320px;
  height: 100vh;
  background: #0b0f19;
  border-left: 1px solid var(--border-color);
  padding: 5rem 2rem 2rem 2rem;
  z-index: 99;
  transition: right 0.4s ease-in-out;
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.mobile-menu.open {
  right: 0;
}

.mobile-menu-link {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-muted);
  text-decoration: none;
}

.mobile-menu-link:hover {
  color: var(--cyan-light);
}

/* --- Hero Section & Profile Photo --- */
.hero-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  padding-top: 8rem;
  overflow: hidden;
}

#neural-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 3.5rem;
  align-items: center;
  position: relative;
  z-index: 2;
}

.hero-content {
  max-width: 750px;
}

.hero-photo-wrapper {
  display: flex;
  justify-content: center;
  position: relative;
}

.hero-photo-frame {
  width: 280px;
  height: 280px;
  border-radius: 30px;
  padding: 8px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--cyan) 50%, var(--purple) 100%);
  box-shadow: 0 0 40px rgba(99, 102, 241, 0.35);
  position: relative;
  transition: transform var(--transition-normal);
}

.hero-photo-frame:hover {
  transform: scale(1.03) rotate(1deg);
  box-shadow: 0 0 50px rgba(6, 182, 212, 0.5);
}

.hero-photo-img {
  width: 100%;
  height: 100%;
  border-radius: 22px;
  object-fit: cover;
  background: #0f172a;
  display: block;
}

.hero-photo-badge {
  position: absolute;
  bottom: -15px;
  right: -15px;
  background: rgba(15, 23, 42, 0.9);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-cyan);
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius-full);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--cyan-light);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.4rem 1.1rem;
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid rgba(16, 185, 129, 0.25);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--emerald);
  margin-bottom: 1.5rem;
}

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

.ping-dot::after {
  content: '';
  position: absolute;
  top: -4px;
  left: -4px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--emerald);
  opacity: 0.6;
  animation: ping 2s cubic-bezier(0, 0, 0.2, 1) infinite;
}

@keyframes ping {
  75%, 100% {
    transform: scale(2);
    opacity: 0;
  }
}

.hero-title {
  font-size: clamp(2.3rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 2.5rem;
  max-width: 720px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  flex-wrap: wrap;
}

/* --- About Section --- */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 3rem;
  align-items: center;
}

.about-text {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.8;
}

.about-text p {
  margin-bottom: 1.2rem;
}

.about-highlight {
  color: var(--text-main);
  font-weight: 600;
}

.about-cards-col {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.info-card {
  padding: 1.4rem;
  display: flex;
  align-items: flex-start;
  gap: 1.2rem;
}

.info-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid var(--border-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  flex-shrink: 0;
}

.info-card-content h4 {
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--cyan-light);
  margin-bottom: 0.3rem;
}

.info-card-content p {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
}

/* --- Skills Section --- */
.skill-categories {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

.skill-category-card {
  padding: 2rem;
}

.category-header {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin-bottom: 1.5rem;
  padding-bottom: 0.8rem;
  border-bottom: 1px solid var(--border-color);
}

.category-header h3 {
  font-size: 1.15rem;
  font-weight: 700;
}

.skill-tags-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

.skill-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.9rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.skill-pill:hover {
  background: rgba(99, 102, 241, 0.1);
  border-color: var(--border-glow);
  transform: translateY(-2px);
}

.level-badge {
  font-size: 0.7rem;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  font-family: var(--font-mono);
  text-transform: uppercase;
}

.level-badge.learning {
  background: rgba(245, 158, 11, 0.15);
  color: var(--amber);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.level-badge.intermediate {
  background: rgba(6, 182, 212, 0.15);
  color: var(--cyan-light);
  border: 1px solid rgba(6, 182, 212, 0.3);
}

.level-badge.exploring {
  background: rgba(168, 85, 247, 0.15);
  color: #c084fc;
  border: 1px solid rgba(168, 85, 247, 0.3);
}

/* --- Education Section & Institute Photos --- */
.education-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 2.2rem;
}

.education-card {
  padding: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.edu-photo-box {
  width: 100%;
  height: 200px;
  position: relative;
  overflow: hidden;
  background: #0f172a;
}

.edu-photo-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.education-card:hover .edu-photo-img {
  transform: scale(1.06);
}

.edu-card-body {
  padding: 2rem;
}

.edu-status {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  margin-bottom: 1rem;
}

.edu-status.current {
  background: rgba(16, 185, 129, 0.15);
  color: var(--emerald);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.edu-status.completed {
  background: rgba(6, 182, 212, 0.15);
  color: var(--cyan-light);
  border: 1px solid rgba(6, 182, 212, 0.3);
}

.edu-degree {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
}

.edu-institution {
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: 0.8rem;
}

/* --- Certifications Section --- */
.certs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.8rem;
}

.cert-card {
  padding: 2rem;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.cert-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid var(--border-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  color: var(--primary-light);
  margin-bottom: 1.2rem;
}

.cert-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
}

.cert-issuer {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--cyan-light);
  margin-bottom: 1rem;
}

.cert-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 1.2rem;
  flex-grow: 1;
}

.cert-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  width: fit-content;
}

.cert-badge.active {
  background: rgba(16, 185, 129, 0.15);
  color: var(--emerald);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.cert-badge.pursuing {
  background: rgba(245, 158, 11, 0.15);
  color: var(--amber);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

/* --- Research Section --- */
.research-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  margin-bottom: 4rem;
}

.research-card {
  padding: 2rem;
  height: 100%;
  display: flex;
  flex-direction: column;
}

.research-card-icon {
  width: 50px;
  height: 50px;
  border-radius: var(--radius-md);
  background: rgba(6, 182, 212, 0.1);
  border: 1px solid var(--border-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--cyan-light);
  margin-bottom: 1.2rem;
}

.research-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
  color: var(--text-main);
}

.research-card p {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.philosophy-box {
  padding: 2.5rem;
  text-align: center;
  background: linear-gradient(135deg, rgba(15, 23, 42, 0.8) 0%, rgba(30, 41, 59, 0.5) 100%);
  border: 1px dashed var(--border-glow);
  border-radius: var(--radius-lg);
  max-width: 900px;
  margin: 0 auto;
}

.philosophy-tag {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--cyan-light);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 1rem;
}

.philosophy-text {
  font-size: clamp(1.1rem, 2.5vw, 1.4rem);
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.01em;
  line-height: 1.5;
}

/* --- Projects Section --- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 2rem;
}

.project-card {
  padding: 2.2rem;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.project-focus-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--cyan-light);
  background: rgba(6, 182, 212, 0.1);
  border: 1px solid var(--border-cyan);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  margin-bottom: 1.2rem;
  width: fit-content;
}

.project-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 0.8rem;
  color: var(--text-main);
}

.project-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.project-features {
  list-style: none;
  margin-bottom: 1.8rem;
  flex-grow: 1;
}

.project-features li {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.project-features li svg {
  color: var(--cyan-light);
  flex-shrink: 0;
}

.project-tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
}

.tech-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
  background: rgba(255, 255, 255, 0.03);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
}

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

/* --- AI Research Journey --- */
.timeline {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem 0;
  display: flex;
  flex-direction: column;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 2px;
  height: 100%;
  background: linear-gradient(180deg, var(--primary) 0%, var(--cyan) 50%, var(--purple) 100%);
}

.timeline-item {
  display: flex;
  justify-content: flex-end;
  padding-right: 3rem;
  position: relative;
  margin-bottom: 3rem;
  width: 50%;
}

.timeline-item:nth-child(even) {
  align-self: flex-end;
  justify-content: flex-start;
  padding-right: 0;
  padding-left: 3rem;
  margin-left: 50%;
}

.timeline-dot {
  position: absolute;
  top: 1.5rem;
  right: -10px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--bg-dark);
  border: 3px solid var(--cyan);
  box-shadow: 0 0 12px var(--cyan);
  z-index: 2;
}

.timeline-item:nth-child(even) .timeline-dot {
  right: auto;
  left: -10px;
}

.timeline-content {
  padding: 1.8rem;
  width: 100%;
}

.timeline-step {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--cyan-light);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.4rem;
}

.timeline-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
}

.timeline-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* --- Learning Roadmap --- */
.roadmap-container {
  overflow-x: auto;
  padding: 2rem 0;
}

.roadmap-flow {
  display: flex;
  align-items: center;
  gap: 1rem;
  min-width: 1100px;
  padding: 1rem;
}

.roadmap-node {
  padding: 1.2rem 1.5rem;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  min-width: 150px;
  text-align: center;
  position: relative;
}

.roadmap-node.completed {
  border-color: rgba(16, 185, 129, 0.4);
  background: rgba(16, 185, 129, 0.05);
}

.roadmap-node.in-progress {
  border-color: var(--border-cyan);
  background: rgba(6, 182, 212, 0.08);
  box-shadow: 0 0 15px rgba(6, 182, 212, 0.2);
}

.roadmap-node-step {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-dim);
  margin-bottom: 0.3rem;
}

.roadmap-node-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
}

.roadmap-arrow {
  color: var(--text-dim);
  font-size: 1.2rem;
  flex-shrink: 0;
}

/* --- AI Research Lab --- */
.lab-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.8rem;
}

.lab-card {
  padding: 2rem;
  border: 1px solid var(--border-color);
  position: relative;
  overflow: hidden;
}

.lab-badge {
  position: absolute;
  top: 1.2rem;
  right: 1.2rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  background: rgba(245, 158, 11, 0.15);
  color: var(--amber);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.lab-category {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--cyan-light);
  margin-bottom: 0.8rem;
}

.lab-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
}

.lab-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* --- GitHub Section --- */
.github-wrapper {
  padding: 3rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.github-profile-info {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.github-avatar {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  border: 2px solid var(--cyan-light);
  box-shadow: 0 0 15px rgba(6, 182, 212, 0.3);
}

.github-user-name {
  font-size: 1.4rem;
  font-weight: 700;
}

.github-user-handle {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--cyan-light);
}

.github-stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}

.github-stat-box {
  padding: 1rem;
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  text-align: center;
}

.github-stat-val {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-main);
}

.github-stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

/* --- Current Focus Grid --- */
.focus-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.2rem;
  margin-bottom: 2rem;
}

.focus-card {
  padding: 1.2rem;
  display: flex;
  align-items: center;
  gap: 0.8rem;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
}

.focus-card-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan-light);
  box-shadow: 0 0 8px var(--cyan-light);
}

.focus-card p {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-main);
}

/* --- Philosophy Quote --- */
.quote-section {
  text-align: center;
  padding: 5rem 2rem;
  background: radial-gradient(circle at center, rgba(99, 102, 241, 0.1) 0%, transparent 70%);
}

.quote-large {
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
  color: var(--text-main);
}

.quote-small {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 650px;
  margin: 0 auto;
}

/* --- Contact Section --- */
.contact-wrapper {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
  padding: 4rem 2rem;
}

.contact-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.2rem;
  flex-wrap: wrap;
  margin-top: 2.5rem;
}

.copy-email-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.85rem 1.8rem;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-glow);
  color: var(--text-main);
  font-weight: 600;
  transition: all var(--transition-fast);
}

.copy-email-btn:hover {
  background: rgba(99, 102, 241, 0.15);
  border-color: var(--primary-light);
  transform: translateY(-2px);
}

/* --- Footer --- */
.footer {
  border-top: 1px solid var(--border-color);
  padding: 3rem 0;
  background: #04060a;
}

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

.footer-brand {
  font-size: 1.1rem;
  font-weight: 700;
}

.footer-tagline {
  font-size: 0.88rem;
  color: var(--text-muted);
}

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

/* --- Modal Dialog --- */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(4, 6, 10, 0.85);
  backdrop-filter: blur(12px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background: #0f172a;
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-lg);
  max-width: 650px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  padding: 2.5rem;
  position: relative;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.8);
  transform: translateY(20px);
  transition: transform var(--transition-normal);
}

.modal-overlay.active .modal-content {
  transform: translateY(0);
}

.modal-close {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  font-size: 1.5rem;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.modal-close:hover {
  color: var(--text-main);
}

/* --- Media Queries / Responsive --- */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-content {
    margin: 0 auto;
  }
  .hero-actions {
    justify-content: center;
  }
  .hero-photo-wrapper {
    order: -1;
    margin-bottom: 2rem;
  }
  .about-grid {
    grid-template-columns: 1fr;
  }
  .github-wrapper {
    grid-template-columns: 1fr;
  }
  .timeline::before {
    left: 20px;
  }
  .timeline-item,
  .timeline-item:nth-child(even) {
    width: 100%;
    padding-left: 3.5rem;
    padding-right: 0;
    margin-left: 0;
  }
  .timeline-dot,
  .timeline-item:nth-child(even) .timeline-dot {
    left: 10px;
    right: auto;
  }
}

@media (max-width: 768px) {
  .nav-links, .nav-right .btn-primary {
    display: none;
  }
  .mobile-toggle {
    display: block;
  }
  section {
    padding: 4rem 0;
  }
  .hero-title {
    font-size: 2.4rem;
  }
  .hero-photo-frame {
    width: 220px;
    height: 220px;
  }
  .quote-large {
    font-size: 1.6rem;
  }
}