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

:root {
  --primary: #0f172a;
  --secondary: #334155;
  --accent: #2563eb;
  --accent-light: #3b82f6;
  --text: #0f172a;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --bg-card: #ffffff;
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
  --shadow-lg: 0 10px 25px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);
}

/* ========== Dark Theme ========== */
[data-theme="dark"] {
  color-scheme: dark;
  --primary: #e2e8f0;
  --secondary: #cbd5e1;
  --accent: #3b82f6;
  --accent-light: #60a5fa;
  --text: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --bg: #0f172a;
  --bg-alt: #1e293b;
  --bg-card: #1e293b;
  --border: #334155;
  --border-light: #1e293b;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow: 0 1px 3px rgba(0,0,0,0.4), 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.4), 0 2px 4px -2px rgba(0,0,0,0.3);
  --shadow-lg: 0 10px 25px -3px rgba(0,0,0,0.5), 0 4px 6px -4px rgba(0,0,0,0.3);
}

[data-theme="dark"] nav {
  background: rgba(15, 23, 42, 0.45);
  border-bottom-color: rgba(255, 255, 255, 0.06);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

[data-theme="dark"] .btn-primary {
  background: #e2e8f0;
  color: #0f172a;
}

[data-theme="dark"] .btn-primary:hover {
  background: #cbd5e1;
}

[data-theme="dark"] .project-card.featured::after {
  background: #e2e8f0;
  color: #0f172a;
}

[data-theme="dark"] .social-link:hover {
  background: #e2e8f0;
  color: #0f172a;
  border-color: #e2e8f0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
  position: relative;
  line-height: 1.6;
}

body::before {
  display: none;
}

.grid-bg {
  display: none;
}

/* ========== Logo ========== */
.nav-logo {
  font-family: 'IBM Plex Sans', sans-serif;
  font-weight: 600;
  font-size: 1.25rem;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.02em;
  margin-right: 36px;
  flex-shrink: 0;
}

/* ========== Navigation ========== */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.45);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  padding: 0 40px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  border-radius: 0;
  transform: none;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.04), inset 0 1px 0 rgba(255, 255, 255, 0.6);
  max-width: 100%;
}

nav ul {
  display: flex;
  list-style: none;
  gap: 36px;
  align-items: center;
}

nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s;
  position: relative;
  letter-spacing: -0.01em;
}

nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1.5px;
  background: var(--text);
  transition: width 0.2s;
}

nav a:hover::after {
  width: 100%;
}

nav a:hover {
  color: var(--text);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  font-size: 24px;
  cursor: pointer;
}

/* ========== Theme Toggle ========== */
.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  width: 36px;
  height: 36px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 15px;
  margin-left: auto;
  flex-shrink: 0;
}

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

/* ========== Hero Section ========== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  padding: 140px 24px 80px;
  background: var(--bg);
  overflow: hidden;
}

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

.hero-content {
  text-align: center;
  z-index: 1;
  max-width: 720px;
  position: relative;
}

.hero h1 {
  font-size: clamp(3rem, 8vw, 5.5rem);
  font-weight: 900;
  background: none;
  -webkit-background-clip: unset;
  -webkit-text-fill-color: unset;
  background-clip: unset;
  color: var(--text);
  margin-bottom: 20px;
  animation: fadeInUp 0.8s ease;
  letter-spacing: -0.04em;
  line-height: 1.05;
}

.hero p {
  font-size: clamp(1.05rem, 2.5vw, 1.25rem);
  color: var(--text-secondary);
  margin-bottom: 40px;
  animation: fadeInUp 0.8s ease 0.15s backwards;
  line-height: 1.6;
  letter-spacing: -0.01em;
}

.hero-image {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  margin: 0 auto 36px;
  position: relative;
  animation: fadeInUp 0.8s ease 0.3s backwards;
}

.hero-image::before {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: 50%;
  background: var(--border);
  z-index: -1;
  animation: none;
}

.hero-image img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--bg);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.cta-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease 0.45s backwards;
}

.btn {
  padding: 14px 32px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
  transition: all 0.2s;
  position: relative;
  overflow: hidden;
  letter-spacing: -0.01em;
}

.btn-primary {
  background: var(--text);
  color: white;
  border: none;
}

.btn-primary:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 8px 25px rgba(37, 99, 235, 0.15);
  background: var(--secondary);
}

.btn-secondary {
  background: transparent;
  color: var(--text);
  border: 1.5px solid var(--border);
}

.btn-secondary:hover {
  background: var(--bg-alt);
  border-color: var(--text-muted);
  transform: translateY(-2px) scale(1.02);
  box-shadow: var(--shadow-md);
}

/* ========== Section Styling ========== */
section {
  padding: 120px 24px;
  position: relative;
  z-index: 1;
}

.section-title {
  text-align: center;
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 800;
  margin-bottom: 16px;
  background: none;
  -webkit-background-clip: unset;
  -webkit-text-fill-color: unset;
  background-clip: unset;
  color: var(--text);
  letter-spacing: -0.03em;
}

.section-subtitle {
  text-align: center;
  color: var(--text-secondary);
  max-width: 500px;
  margin: -8px auto 48px;
  font-size: 1.05rem;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
}

/* ========== About Section ========== */
#about {
  background: var(--bg-alt);
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  margin-top: 48px;
}

.about-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
  transition: all 0.2s;
}

.about-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--text-muted);
}

.about-card h3 {
  color: var(--text);
  font-size: 1.25rem;
  margin-bottom: 12px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.about-card p {
  line-height: 1.7;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* ========== Project Grid ========== */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
  transition: all 0.2s;
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.08);
  border-color: var(--accent-light);
}

.project-card h3 {
  color: var(--text);
  font-size: 1.15rem;
  margin-bottom: 10px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.project-card .status {
  display: inline-block;
  padding: 4px 10px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin: 6px 0;
  font-weight: 500;
}

.project-card p {
  color: var(--text-secondary);
  line-height: 1.7;
  margin: 10px 0;
  font-size: 0.93rem;
}

.project-card a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.93rem;
  transition: color 0.2s;
}

.project-card a:hover {
  color: var(--accent-light);
}

.project-card.featured {
  border: 2px solid var(--text);
  position: relative;
}

.project-card.featured::after {
  content: 'FEATURED';
  position: absolute;
  top: -10px;
  right: 20px;
  background: var(--text);
  color: white;
  font-size: 0.6rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 4px;
  letter-spacing: 0.08em;
}

.project-card.startup {
  border: 2px solid var(--accent);
}

.project-card.startup::after {
  content: 'STARTUP';
  position: absolute;
  top: -10px;
  right: 20px;
  background: var(--accent);
  color: white;
  font-size: 0.6rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 4px;
  letter-spacing: 0.08em;
}

/* ========== Experience Section ========== */
.experience-empty {
  text-align: center;
  padding: 48px 24px;
  border: 2px dashed var(--border);
  border-radius: 12px;
  color: var(--text-muted);
}

.experience-empty p {
  font-size: 0.95rem;
  margin-top: 8px;
}

/* ========== Cert / Learning Grid ========== */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}

.cert-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
  transition: all 0.2s;
}

.cert-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--text-muted);
}

.cert-card h3 {
  color: var(--text);
  font-size: 1.1rem;
  margin-bottom: 8px;
  font-weight: 700;
}

.cert-card .status {
  display: inline-block;
  padding: 4px 10px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin: 6px 0;
  font-weight: 500;
}

.cert-card p {
  color: var(--text-secondary);
  line-height: 1.7;
  margin: 10px 0 0;
  font-size: 0.93rem;
}

/* ========== Tech Tags ========== */
.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 14px;
}

.tech-tag {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.75rem;
  padding: 4px 10px;
  border-radius: 4px;
  font-weight: 500;
}

.project-card .tech-tag {
  background: var(--bg-alt);
  border-color: var(--border);
  color: var(--text-secondary);
}

/* ========== Skills Grid ========== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.skill-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
  transition: all 0.2s;
}

.skill-card:hover {
  transform: translateY(-2px);
  border-color: var(--text-muted);
  box-shadow: var(--shadow-md);
}

.skill-card strong {
  color: var(--text);
  font-size: 1rem;
  font-weight: 700;
}

.skill-card p {
  color: var(--text-secondary);
  line-height: 1.7;
  margin-top: 8px;
  font-size: 0.95rem;
}

/* ========== Tech Logo Marquee ========== */
.tech-stack-section {
  margin-top: 64px;
}

.tech-stack-label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.tech-marquee {
  overflow: hidden;
  -webkit-mask-image: linear-gradient(to right, transparent, black 8%, black 92%, transparent);
  mask-image: linear-gradient(to right, transparent, black 8%, black 92%, transparent);
}

.tech-marquee-track {
  display: flex;
  gap: 14px;
  width: max-content;
  animation: marqueeScroll 35s linear infinite;
}

.tech-marquee:hover .tech-marquee-track {
  animation-play-state: paused;
}

@keyframes marqueeScroll {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

.tech-logo-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 16px;
  min-width: 80px;
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

.tech-logo-card:hover {
  transform: translateY(-3px);
}

.tech-logo-card img {
  width: 32px;
  height: 32px;
  object-fit: contain;
}

.tech-logo-card span {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
  text-align: center;
  line-height: 1.2;
}

/* ========== Travel / Startup Section ========== */
.travel-section {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 64px 32px;
  margin-top: 80px;
  position: relative;
  overflow: hidden;
}

.travel-section::before {
  display: none;
}

.travel-header {
  text-align: center;
  margin-bottom: 48px;
}

.travel-header h2 {
  font-size: clamp(1.6rem, 4vw, 2.25rem);
  font-weight: 800;
  background: none;
  -webkit-background-clip: unset;
  -webkit-text-fill-color: unset;
  background-clip: unset;
  color: var(--text);
  margin-bottom: 12px;
  letter-spacing: -0.03em;
}

.travel-header p {
  color: var(--text-secondary);
  font-size: 1.05rem;
}

.travel-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  max-width: 1000px;
  margin: 0 auto;
}

.travel-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
  transition: all 0.2s;
  position: relative;
  overflow: hidden;
}

.travel-card::before {
  display: none;
}

.travel-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--text-muted);
}

.travel-card .travel-icon {
  font-size: 2rem;
  margin-bottom: 14px;
}

.travel-card h3 {
  color: var(--text);
  font-size: 1.15rem;
  margin-bottom: 8px;
  font-weight: 700;
}

.travel-card p {
  color: var(--text-secondary);
  line-height: 1.7;
  font-size: 0.95rem;
}

.travel-stats {
  display: flex;
  justify-content: center;
  gap: 40px;
  margin-top: 40px;
  flex-wrap: wrap;
}

.travel-stat {
  text-align: center;
}

.travel-stat .number {
  font-size: 2.5rem;
  font-weight: 800;
  background: none;
  -webkit-background-clip: unset;
  -webkit-text-fill-color: unset;
  background-clip: unset;
  color: var(--text);
}

.travel-stat .label {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 5px;
}

/* ========== Shorts Row ========== */
.shorts-row {
  display: flex;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.short-card {
  width: 260px;
  height: 460px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  transition: all 0.2s;
  position: relative;
}

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

.short-card iframe,
.short-card blockquote {
  width: 100%;
  height: 100%;
  border: none;
  margin: 0;
}

.short-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  color: var(--text-muted);
  background: var(--bg-alt);
}

.short-placeholder i {
  font-size: 2.5rem;
  background: none;
  -webkit-background-clip: unset;
  -webkit-text-fill-color: unset;
  background-clip: unset;
  color: var(--text-muted);
}

.short-placeholder span {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.short-placeholder p {
  font-size: 0.85rem;
  color: var(--text-muted);
  padding: 5px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
}

/* ========== Social Links ========== */
.social-grid {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.social-link {
  width: 52px;
  height: 52px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-size: 1.25rem;
  transition: all 0.2s;
  text-decoration: none;
}

.social-link:hover {
  transform: translateY(-2px);
  background: var(--text);
  color: white;
  border-color: var(--text);
  box-shadow: var(--shadow-md);
}

.social-link i {
  transition: transform 0.2s ease;
}

.social-link:hover i {
  transform: scale(1.15);
}

/* ========== Scroll Fade Animations ========== */
.scroll-fade {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.scroll-fade.visible {
  opacity: 1;
  transform: translateY(0);
}

.scroll-fade-delay-1 { transition-delay: 0.1s; }
.scroll-fade-delay-2 { transition-delay: 0.2s; }
.scroll-fade-delay-3 { transition-delay: 0.3s; }
.scroll-fade-delay-4 { transition-delay: 0.4s; }

/* ========== Footer ========== */
footer {
  text-align: center;
  padding: 48px 24px;
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* ========== Responsive ========== */
@media (max-width: 768px) {
  nav {
    padding: 0 20px;
  }

  nav ul {
    display: none;
    flex-direction: column;
    gap: 12px;
    position: absolute;
    top: 64px;
    left: 0;
    width: 100%;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    border-radius: 0;
    padding: 20px;
    box-shadow: var(--shadow-lg);
  }

  nav ul.active {
    display: flex;
  }

  .menu-toggle {
    display: block;
  }

  section {
    padding: 80px 20px;
  }

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

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

  .travel-stats {
    gap: 25px;
  }

  .travel-stat .number {
    font-size: 2rem;
  }

  .short-card {
    width: 100%;
    max-width: 300px;
    height: 420px;
  }

  .hero {
    padding: 120px 20px 60px;
  }
}