@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@300;400;500;600;700&family=Space+Mono:wght@400;700&display=swap');

:root {
  /* Dark Theme (Default) */
  --bg-main: #111827;
  --bg-card: #1f2937;
  --border: #374151;
  --border-hover: #4b5563;
  --text-primary: #f9fafb;
  --text-muted: #9ca3af;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  
  --font-sans: 'Space Grotesk', system-ui, sans-serif;
  --font-mono: 'Space Mono', monospace;
  --container: 1200px;
  --space-section: 120px;
  --space-card: 32px;
  --radius: 12px;
  --transition: 0.2s ease;
}

[data-theme='light'] {
  --bg-main: #fafafa;
  --bg-card: #ffffff;
  --border: #e4e4e7;
  --border-hover: #d4d4d8;
  --text-primary: #09090b;
  --text-muted: #71717a;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: auto; /* Handled by JS for offset */
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.3s ease, color 0.3s ease;
  position: relative;
}



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

ul {
  list-style: none;
}

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

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--border-hover);
}

/* Scroll Progress */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--accent);
  z-index: 9999;
  transform-origin: left;
  transform: scaleX(0);
}



/* Keyboard Nav Focus */
body:not(.keyboard-nav) *:focus {
  outline: none;
}

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 32px;
}

/* ===== NAVBAR ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 20px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: padding 0.3s ease, background-color 0.3s ease, backdrop-filter 0.3s ease, border-bottom 0.3s ease;
  border-bottom: 1px solid transparent;
}

.navbar.scrolled {
  padding: 16px 32px;
  background-color: rgba(9, 9, 11, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

[data-theme='light'] .navbar.scrolled {
  background-color: rgba(250, 250, 250, 0.8);
}

.nav-logo {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 1.5rem;
  letter-spacing: -0.04em;
  color: var(--text-primary);
}

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

.nav-links {
  display: flex;
  gap: 8px;
}

.nav-links a {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 8px 16px;
  color: var(--text-muted);
  border-radius: 6px;
  transition: var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
  background-color: rgba(255, 255, 255, 0.05);
}

[data-theme='light'] .nav-links a:hover,
[data-theme='light'] .nav-links a.active {
  background-color: rgba(0, 0, 0, 0.05);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-muted);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}

.theme-toggle:hover {
  border-color: var(--border-hover);
  color: var(--text-primary);
}

.icon-sun { display: none; }
.icon-moon { display: block; }

[data-theme='light'] .icon-sun { display: block; }
[data-theme='light'] .icon-moon { display: none; }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: 4px;
}

.icon-close { display: none; }

/* ===== SECTIONS COMMON ===== */
section {
  padding: var(--space-section) 0;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 16px;
  display: block;
  font-weight: 700;
}

.section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  line-height: 1.1;
}

.section-subtitle {
  color: var(--text-muted);
  font-size: 1.1rem;
  max-width: 600px;
  margin-bottom: 64px;
}

.meta-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.meta-tag.accent {
  color: var(--accent);
  font-weight: 700;
}

/* ===== HERO ===== */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 80px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.hero-greeting {
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  font-weight: 500;
}

.hero-name {
  font-size: clamp(3rem, 6vw, 4.5rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1;
  margin-bottom: 16px;
}

.hero-title {
  font-size: clamp(1.2rem, 2.5vw, 1.75rem);
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 24px;
  height: 2.2rem;
}

.typing-cursor {
  font-weight: 300;
  color: var(--accent);
  animation: blink 1s step-end infinite;
}

.hero-desc {
  color: var(--text-muted);
  font-size: 1.05rem;
  line-height: 1.75;
  max-width: 520px;
  margin-bottom: 40px;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  margin-bottom: 48px;
}

.btn-primary, .btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  transition: var(--transition);
}

.btn-primary {
  background: var(--accent);
  color: #ffffff;
  border: 1px solid var(--accent);
}

.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.btn-outline:hover {
  border-color: var(--border-hover);
  background: var(--bg-card);
  transform: translateY(-2px);
}

.hero-socials {
  display: flex;
  gap: 16px;
}

.hero-socials a {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: var(--transition);
}

.hero-socials a:hover {
  border-color: var(--border-hover);
  color: var(--text-primary);
  background: var(--bg-card);
  transform: translateY(-2px);
}

.hero-visual {
  display: flex;
  justify-content: flex-end;
}

.hero-avatar-wrap {
  width: 100%;
  max-width: 420px;
  aspect-ratio: 4/5;
  border-radius: 24px;
  border: 1px solid var(--border);
  padding: 8px;
  background: var(--bg-card);
  animation: float 6s ease-in-out infinite;
}

.hero-avatar {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 16px;
}

/* ===== ABOUT ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  margin-top: 48px;
}

.about-text p {
  color: var(--text-muted);
  margin-bottom: 24px;
  font-size: 1.05rem;
}

.about-text strong {
  color: var(--text-primary);
  font-weight: 600;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 40px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  transition: var(--transition);
}

.stat-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

.stat-card.stat-highlight {
  border-color: rgba(37, 99, 235, 0.3);
  background: linear-gradient(180deg, rgba(37, 99, 235, 0.05) 0%, transparent 100%);
}

.stat-meta {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  color: var(--accent);
  display: block;
  margin-bottom: 8px;
  font-weight: 700;
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1;
  color: var(--text-primary);
  margin-bottom: 8px;
}

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

.edu-heading {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.2rem;
  margin-bottom: 24px;
}

.edu-cards {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.edu-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: var(--transition);
}

.edu-card:hover {
  border-color: var(--border-hover);
}

.edu-degree {
  font-weight: 600;
  font-size: 1.1rem;
  margin-bottom: 4px;
}

.edu-school {
  color: var(--text-muted);
  margin-bottom: 16px;
}

.edu-meta {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ===== SKILLS ===== */
.skills-bento {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 16px;
}

.skill-category {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: var(--transition);
}

.skill-category:hover {
  border-color: var(--border-hover);
}

.skill-category.span-4 { grid-column: span 4; }
.skill-category.span-6 { grid-column: span 6; }
.skill-category.span-8 { grid-column: span 8; }

.skill-cat-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}

.skill-cat-icon {
  width: 32px;
  height: 32px;
  background: rgba(37, 99, 235, 0.1);
  color: var(--accent);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.skill-cat-name {
  font-weight: 600;
  font-size: 1.05rem;
}

.skill-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.skill-chip {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 8px 16px;
  background: var(--bg-main);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text-muted);
  transition: var(--transition);
}

.skill-chip:hover {
  border-color: var(--accent);
  color: var(--text-primary);
  background: rgba(37, 99, 235, 0.05);
  transform: translateY(-2px);
}

/* ===== PROJECTS ===== */
.projects-bento {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  position: relative;
}

.project-card:hover {
  border-color: var(--accent);
  box-shadow: 0 0 20px rgba(37, 99, 235, 0.05);
  transform: translateY(-4px);
}

.project-card.bento-featured {
  grid-column: span 2;
}

.project-gradient {
  height: 6px;
  border-radius: 12px 12px 0 0;
}

.gradient-blue { background: linear-gradient(90deg, #3b82f6, #6366f1); }
.gradient-purple { background: linear-gradient(90deg, #8b5cf6, #a855f7); }
.gradient-green { background: linear-gradient(90deg, #10b981, #3b82f6); }

.project-header {
  padding: 24px 24px 0;
}

.project-meta-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.project-icon {
  width: 48px;
  height: 48px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
}

.project-card:not(.bento-featured) .project-icon {
  margin-bottom: 16px;
}

.project-name {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.project-tagline {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.project-body {
  padding: 0 24px 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.project-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 24px;
}

.project-highlights {
  margin-bottom: 24px;
}

.project-highlights li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 8px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.project-highlights li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--border-hover);
  font-family: var(--font-mono);
}

.project-tech {
  margin-top: auto;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.project-tech span {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
}

.project-tech span:not(:last-child)::after {
  content: '•';
  margin-left: 8px;
  color: var(--border);
}

/* ===== CERTIFICATIONS ===== */
.timeline {
  position: relative;
  padding-left: 32px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 5px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  margin-bottom: 32px;
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-dot {
  position: absolute;
  left: -32px;
  top: 24px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--border-hover);
  border: 2px solid var(--bg-main);
}

.timeline-dot.accent-dot {
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
}

.timeline-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: var(--transition);
}

.timeline-card:hover {
  border-color: var(--border-hover);
  transform: translateX(4px);
}

.timeline-card.patent-card {
  border-color: rgba(37, 99, 235, 0.3);
}

.timeline-card.patent-card:hover {
  border-color: var(--accent);
}

.cert-header-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 16px;
}

.cert-icon {
  width: 40px;
  height: 40px;
  background: var(--bg-main);
  border: 1px solid var(--border);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.cert-header-row .cert-icon {
  margin-bottom: 0;
}

.cert-title {
  font-weight: 600;
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.cert-issuer {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.cert-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
  margin-top: 4px;
}

.cert-date {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 16px;
}

/* ===== CONTACT ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
}

.contact-info h3 {
  font-size: 1.5rem;
  margin-bottom: 16px;
}

.contact-info p {
  color: var(--text-muted);
  margin-bottom: 40px;
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.contact-link {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: var(--transition);
}

.contact-link:hover {
  border-color: var(--border-hover);
  transform: translateX(4px);
}

.contact-link-icon {
  width: 40px;
  height: 40px;
  background: var(--bg-main);
  border: 1px solid var(--border);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
}

.contact-link-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-bottom: 2px;
}

.contact-link-value {
  font-weight: 500;
}

.contact-form {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px;
}

.form-group {
  margin-bottom: 24px;
}

.form-group label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-main);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  transition: var(--transition);
}

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

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.1);
}

.form-group input.invalid,
.form-group textarea.invalid {
  border-color: #ef4444;
}

.form-submit {
  width: 100%;
  justify-content: center;
  padding: 14px;
}

/* ===== FOOTER ===== */
footer {
  border-top: 1px solid var(--border);
  padding: 64px 0 32px;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 64px;
  margin-bottom: 64px;
}

.footer-tagline {
  color: var(--text-muted);
  margin-top: 16px;
  max-width: 300px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  color: var(--text-muted);
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--text-primary);
}

.footer-socials {
  display: flex;
  gap: 16px;
}

.footer-socials a {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: var(--transition);
}

.footer-socials a:hover {
  border-color: var(--border-hover);
  color: var(--text-primary);
  background: var(--bg-card);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}

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

.footer-text span {
  font-weight: 500;
  color: var(--text-primary);
}

.back-to-top {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}

.back-to-top:hover {
  border-color: var(--border-hover);
  color: var(--text-primary);
}

/* ===== ANIMATIONS ===== */
@keyframes float {
  0% { transform: translateY(0px); }
  50% { transform: translateY(-10px); }
  100% { transform: translateY(0px); }
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

body:not(.loaded) .reveal {
  transition: none;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 48px;
  }
  
  .hero-desc {
    margin: 0 auto 40px;
  }
  
  .hero-buttons,
  .hero-socials {
    justify-content: center;
  }
  
  .hero-visual {
    justify-content: center;
    order: -1;
  }
  
  .about-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }
  
  .skills-bento .skill-category {
    grid-column: span 6 !important;
  }
  
  .projects-bento {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .project-card.bento-featured {
    grid-column: span 2;
  }
  
  .footer-content {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .navbar {
    padding: 16px 24px;
  }
  
  .nav-links {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-main);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 24px;
    transform: translateY(-100%);
    transition: transform 0.3s ease;
    z-index: -1;
  }
  
  .nav-links.open {
    transform: translateY(0);
  }
  
  .nav-links a {
    font-size: 1.2rem;
  }
  
  .nav-toggle {
    display: block;
    z-index: 100;
  }
  
  .nav-links.open ~ .nav-actions .icon-menu { display: none; }
  .nav-links.open ~ .nav-actions .icon-close { display: block; }
  
  .skills-bento .skill-category,
  .projects-bento {
    grid-template-columns: 1fr;
  }
  
  .project-card.bento-featured {
    grid-column: span 1;
  }
  
  .about-stats {
    grid-template-columns: 1fr;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}