/* ============================================
   Base & Reset
   ============================================ */

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

:root {
  --bg-primary: #0a0f1c;
  --bg-secondary: #111827;
  --bg-card: #1a2234;
  --bg-card-hover: #1f2a3f;
  --text-primary: #e4e8f1;
  --text-secondary: #9ca3b4;
  --text-muted: #6b7280;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --accent-glow: rgba(59, 130, 246, 0.15);
  --green: #10b981;
  --yellow: #f59e0b;
  --red: #ef4444;
  --border: #1e293b;
  --nav-bg: rgba(10, 15, 28, 0.85);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.25);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

a:hover {
  color: var(--accent-hover);
}

ul {
  list-style: none;
}

img {
  max-width: 100%;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}


/* ============================================
   Navigation
   ============================================ */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--nav-bg);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.navbar.scrolled {
  border-bottom-color: var(--border);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

.nav-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 64px;
}

.nav-logo {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent);
}

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

.nav-menu {
  display: flex;
  gap: 32px;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: 4px 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width var(--transition);
}

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

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}


/* ============================================
   Hero Section
   ============================================ */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 100px 0 60px;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-greeting {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--accent);
  margin-bottom: 12px;
}

.hero-name {
  font-size: 3rem;
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 8px;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-title {
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.hero-desc {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 520px;
  margin-bottom: 32px;
  line-height: 1.8;
}

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


/* Code Block Visual */

.code-block {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.code-header {
  display: flex;
  gap: 8px;
  padding: 12px 16px;
  background: rgba(0, 0, 0, 0.2);
}

.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.dot.red { background: var(--red); }
.dot.yellow { background: var(--yellow); }
.dot.green { background: var(--green); }

.code-block pre {
  padding: 20px 24px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.8;
  color: var(--text-secondary);
  overflow-x: auto;
}

.code-keyword { color: #c084fc; }
.code-func { color: #60a5fa; }
.code-type { color: #34d399; }
.code-string { color: #fbbf24; }
.code-number { color: #f97316; }


/* ============================================
   Buttons
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  font-size: 0.9rem;
  font-weight: 600;
  font-family: var(--font-sans);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  border: none;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 2px 12px var(--accent-glow);
}

.btn-primary:hover {
  background: var(--accent-hover);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 4px 20px var(--accent-glow);
}

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

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

.btn-lg {
  padding: 14px 36px;
  font-size: 1rem;
}


/* ============================================
   Sections
   ============================================ */

.section {
  padding: 100px 0;
}

.section-alt {
  background: var(--bg-secondary);
}

.section-title {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 48px;
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 48px;
  height: 3px;
  background: var(--accent);
  border-radius: 2px;
}


/* ============================================
   About Section
   ============================================ */

.about-grid {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 48px;
  align-items: start;
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: 16px;
  font-size: 0.95rem;
}

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

.about-text em {
  color: var(--accent);
  font-style: normal;
}

.about-highlights {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.highlight-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 20px;
  text-align: center;
  transition: border-color var(--transition), transform var(--transition);
}

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

.highlight-number {
  display: block;
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1.2;
}

.highlight-label {
  display: block;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 4px;
}


/* ============================================
   Experience Timeline
   ============================================ */

.timeline {
  position: relative;
  padding-left: 32px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  margin-bottom: 40px;
}

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

.timeline-marker {
  position: absolute;
  left: -32px;
  top: 8px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 3px solid var(--accent);
  z-index: 1;
}

.timeline-item:first-child .timeline-marker {
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-glow);
}

.timeline-content {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color var(--transition), transform var(--transition);
}

.timeline-content:hover {
  border-color: rgba(59, 130, 246, 0.3);
  transform: translateX(4px);
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 4px;
}

.timeline-role {
  font-size: 1.15rem;
  font-weight: 600;
}

.timeline-company {
  font-size: 0.95rem;
  color: var(--accent);
  margin-top: 2px;
}

.timeline-period {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  background: rgba(59, 130, 246, 0.1);
  padding: 4px 12px;
  border-radius: 20px;
  white-space: nowrap;
}

.timeline-industry {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.timeline-details {
  list-style: none;
  margin-bottom: 16px;
}

.timeline-details li {
  position: relative;
  padding-left: 18px;
  margin-bottom: 8px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.timeline-details li::before {
  content: '>';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-family: var(--font-mono);
  font-weight: 700;
}

.timeline-details strong {
  color: var(--text-primary);
}

.timeline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 4px 10px;
  background: rgba(59, 130, 246, 0.1);
  color: var(--accent);
  border-radius: 4px;
  border: 1px solid rgba(59, 130, 246, 0.15);
}


/* ============================================
   Skills Section
   ============================================ */

.skills-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.skill-category {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color var(--transition);
}

.skill-category:hover {
  border-color: rgba(59, 130, 246, 0.3);
}

.skill-category-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.skill-icon {
  flex-shrink: 0;
  color: var(--accent);
}

.skill-items {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.skill-item {
  display: flex;
  align-items: center;
  gap: 14px;
}

.skill-name {
  font-size: 0.85rem;
  color: var(--text-secondary);
  min-width: 140px;
  flex-shrink: 0;
}

.skill-bar {
  flex: 1;
  height: 6px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 3px;
  overflow: hidden;
}

.skill-fill {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--accent), #8b5cf6);
  border-radius: 3px;
  transition: width 1.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}


/* ============================================
   Projects Section
   ============================================ */

.projects-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

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

.project-card:hover {
  border-color: rgba(59, 130, 246, 0.3);
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.project-icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.project-name {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.project-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.7;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}


/* ============================================
   Education & Certifications Section
   ============================================ */

.education-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.education-block-title {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--accent);
}

.education-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 20px;
  margin-bottom: 12px;
  transition: border-color var(--transition);
}

.education-card:hover {
  border-color: rgba(59, 130, 246, 0.3);
}

.education-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
  flex-wrap: wrap;
  gap: 8px;
}

.education-name {
  font-size: 0.95rem;
  font-weight: 600;
}

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

.cert-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.cert-item {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  transition: border-color var(--transition);
}

.cert-item:hover {
  border-color: rgba(59, 130, 246, 0.3);
}

.cert-badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  padding: 3px 10px;
  background: rgba(59, 130, 246, 0.12);
  color: var(--accent);
  border-radius: 4px;
  border: 1px solid rgba(59, 130, 246, 0.2);
  white-space: nowrap;
}

.cert-name {
  font-size: 0.9rem;
  color: var(--text-secondary);
}


.cert-link {
  text-decoration: none;
  cursor: pointer;
}

.cert-link:hover {
  border-color: var(--accent);
}

.cert-view {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--accent);
  opacity: 0;
  transition: opacity var(--transition);
}

.cert-item:hover .cert-view {
  opacity: 1;
}

/* Certificate Modal */

.cert-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2000;
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(4px);
  justify-content: center;
  align-items: center;
}

.cert-modal.open {
  display: flex;
  cursor: pointer;
}

.cert-modal-content {
  cursor: default;
}

.cert-modal-hint {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.6);
  pointer-events: none;
}

.cert-modal-content {
  position: relative;
  width: 90%;
  max-width: 700px;
  height: 500px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.cert-modal-close {
  position: absolute;
  top: 12px;
  right: 16px;
  z-index: 10;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  color: var(--text-primary);
  font-size: 1.4rem;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

.cert-modal-close:hover {
  background: var(--accent);
  border-color: var(--accent);
}

.cert-modal-content iframe {
  width: 100%;
  height: 100%;
}


/* ============================================
   Contact Section
   ============================================ */

.contact-content {
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
}

.contact-text {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
  line-height: 1.8;
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.contact-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.9rem;
  transition: all var(--transition);
}

.contact-link:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

.contact-icon {
  flex-shrink: 0;
}


/* ============================================
   Footer
   ============================================ */

.footer {
  padding: 24px 0;
  border-top: 1px solid var(--border);
  text-align: center;
}

.footer p {
  font-size: 0.82rem;
  color: var(--text-muted);
}


/* ============================================
   Animations
   ============================================ */

.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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


/* ============================================
   Responsive
   ============================================ */

@media (max-width: 900px) {
  .hero .container {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero-name {
    font-size: 2.2rem;
  }

  .hero-title {
    font-size: 1.2rem;
  }

  .hero-visual {
    display: none;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .about-highlights {
    grid-template-columns: repeat(4, 1fr);
  }

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

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

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

@media (max-width: 640px) {
  .nav-menu {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 20px 24px;
    gap: 16px;
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition);
  }

  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

  .nav-toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }

  .hero {
    min-height: auto;
    padding: 120px 0 60px;
  }

  .hero-name {
    font-size: 1.9rem;
  }

  .hero-cta {
    flex-direction: column;
  }

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

  .section {
    padding: 64px 0;
  }

  .section-title {
    font-size: 1.5rem;
  }

  .timeline {
    padding-left: 24px;
  }

  .timeline-header {
    flex-direction: column;
    gap: 8px;
  }

  .skill-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .skill-name {
    min-width: auto;
  }

  .contact-links {
    flex-direction: column;
    align-items: center;
  }
}