/* ========== Variables ========== */
:root,
[data-theme="dark"] {
  --bg-primary: #0a0a0f;
  --bg-secondary: #111119;
  --bg-card: #16161f;
  --bg-card-hover: #1c1c28;
  --text-primary: #e8e8ed;
  --text-secondary: #8888a0;
  --text-muted: #55556a;
  --accent: #6c63ff;
  --accent-light: #8b83ff;
  --accent-glow: rgba(108, 99, 255, 0.15);
  --accent-secondary: #00d4aa;
  --border: #222233;
  --particle-color: 108, 99, 255;
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

[data-theme="light"] {
  --bg-primary: #f8f9fc;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f0f1f5;
  --text-primary: #1a1a2e;
  --text-secondary: #555577;
  --text-muted: #8888a0;
  --accent: #5a52e0;
  --accent-light: #6c63ff;
  --accent-glow: rgba(108, 99, 255, 0.1);
  --accent-secondary: #00b894;
  --border: #e0e0ee;
  --particle-color: 90, 82, 224;
}

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

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

body {
  font-family: var(--font-main);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  transition: background 0.4s ease, color 0.4s ease;
}

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

strong { color: var(--accent-light); font-weight: 600; }

[data-theme="light"] strong { color: var(--accent); }

::selection { background: var(--accent); color: #fff; }

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

/* ========== Particle Canvas ========== */
#particleCanvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* ========== Navbar ========== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: all var(--transition);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: rgba(10, 10, 15, 0.8);
}
[data-theme="light"] .navbar { background: rgba(248, 249, 252, 0.85); }

.navbar.scrolled {
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
  background: rgba(10, 10, 15, 0.95);
}
[data-theme="light"] .navbar.scrolled { background: rgba(248, 249, 252, 0.97); }

.nav-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.nav-logo {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--accent) !important;
  letter-spacing: -0.5px;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 28px;
  align-items: center;
  flex: 1;
  justify-content: center;
}

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

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

.nav-links a:hover { color: var(--text-primary); }
.nav-links a:hover::after { width: 100%; }

.nav-cta {
  background: var(--accent) !important;
  color: #fff !important;
  padding: 8px 20px !important;
  border-radius: 50px;
  font-weight: 600 !important;
}
.nav-cta::after { display: none !important; }
.nav-cta:hover { background: var(--accent-light) !important; }

.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);
}

/* Theme Toggle */
.theme-toggle {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition);
  flex-shrink: 0;
  color: var(--text-secondary);
}
.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: rotate(15deg);
}

.theme-icon { width: 18px; height: 18px; }
[data-theme="dark"] .theme-icon.sun { display: block; }
[data-theme="dark"] .theme-icon.moon { display: none; }
[data-theme="light"] .theme-icon.sun { display: none; }
[data-theme="light"] .theme-icon.moon { display: block; }

/* ========== Hero ========== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  padding: 120px 24px 60px;
  overflow: hidden;
}

.hero-bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(var(--particle-color), 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(var(--particle-color), 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 60% 60% at 50% 50%, black 20%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 60% 60% at 50% 50%, black 20%, transparent 70%);
}

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

.hero-avatar {
  width: 80px;
  height: 80px;
  border-radius: 20px;
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 24px;
  box-shadow: 0 8px 32px rgba(var(--particle-color), 0.3);
  animation: float 6s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.hero-greeting {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--accent);
  margin-bottom: 12px;
  letter-spacing: 2px;
  text-transform: uppercase;
}

.hero-name {
  font-size: clamp(3rem, 8vw, 5.5rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-light) 50%, var(--accent-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-typewriter {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
  min-height: 1.8em;
}

.typewriter-prefix { color: var(--text-muted); }
.typewriter-text { color: var(--accent-secondary); }
.typewriter-cursor { color: var(--accent); animation: blink 1s step-end infinite; }
@keyframes blink { 50% { opacity: 0; } }

.hero-description {
  max-width: 600px;
  margin: 0 auto 36px;
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

.hero-actions { display: flex; gap: 12px; justify-content: center; margin-bottom: 60px; flex-wrap: wrap; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 4px 24px rgba(var(--particle-color), 0.3);
}
.btn-primary:hover {
  background: var(--accent-light);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(var(--particle-color), 0.4);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1.5px solid var(--border);
}
.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent-light);
  transform: translateY(-2px);
}

.btn-download svg { stroke: currentColor; }

.btn-lg { padding: 18px 44px; font-size: 1.05rem; }

/* Hero Stats */
.hero-stats { display: flex; gap: 40px; justify-content: center; flex-wrap: wrap; }

.stat { text-align: center; }

.stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--accent);
  font-family: var(--font-mono);
}
.stat-suffix {
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
  font-family: var(--font-mono);
}

.stat-label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-top: 4px;
}

/* Scroll Indicator */
.scroll-indicator {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
}

.scroll-arrow {
  width: 24px;
  height: 38px;
  border: 2px solid var(--text-muted);
  border-radius: 12px;
  position: relative;
}
.scroll-arrow::after {
  content: '';
  position: absolute;
  top: 8px;
  left: 50%;
  transform: translateX(-50%);
  width: 3px;
  height: 8px;
  background: var(--accent);
  border-radius: 2px;
  animation: scroll-bounce 2s ease-in-out infinite;
}
@keyframes scroll-bounce {
  0%, 100% { top: 8px; opacity: 1; }
  50% { top: 18px; opacity: 0.3; }
}

/* ========== Sections ========== */
.section { padding: 100px 0; position: relative; z-index: 1; }
.section-alt { background: var(--bg-secondary); }

.section-title {
  font-size: 2.2rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 60px;
  position: relative;
}
.section-title::after {
  content: '';
  display: block;
  width: 50px;
  height: 3px;
  background: var(--accent);
  margin: 16px auto 0;
  border-radius: 2px;
}

/* ========== About ========== */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
  align-items: start;
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: 20px;
  font-size: 1.05rem;
}

.about-languages { margin-top: 28px; }
.about-languages h3 {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--text-muted);
  margin-bottom: 12px;
}
.language-chips { display: flex; gap: 10px; flex-wrap: wrap; }
.language-chip {
  padding: 6px 18px;
  background: var(--accent-glow);
  color: var(--accent-light);
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 500;
  border: 1px solid rgba(var(--particle-color), 0.15);
}

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

.detail-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: all var(--transition);
}
.detail-card:hover {
  border-color: var(--accent);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
}

.detail-icon {
  color: var(--accent);
  margin-bottom: 10px;
}
.detail-icon svg { stroke: var(--accent); }
.detail-card h3 { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 1.5px; color: var(--text-muted); margin-bottom: 4px; }
.detail-card p, .detail-card a { font-size: 0.95rem; color: var(--text-primary); }

/* ========== Timeline ========== */
.timeline { position: relative; max-width: 800px; margin: 0 auto; }

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--accent), var(--border));
}

.timeline-item {
  position: relative;
  padding-left: 40px;
  margin-bottom: 48px;
}
.timeline-item:last-child { margin-bottom: 0; }

.timeline-marker {
  position: absolute;
  left: -6px;
  top: 8px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 3px solid var(--accent);
  transition: var(--transition);
}
.timeline-item:hover .timeline-marker {
  background: var(--accent);
  box-shadow: 0 0 16px var(--accent-glow);
}

.timeline-content {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: all var(--transition);
}
.timeline-content:hover {
  border-color: rgba(var(--particle-color), 0.3);
  transform: translateX(4px);
}

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

.timeline-content h3 { font-size: 1.2rem; font-weight: 700; }
.timeline-company { color: var(--accent); font-size: 0.9rem; margin-top: 2px; }
.timeline-date {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  white-space: nowrap;
  background: var(--bg-primary);
  padding: 4px 12px;
  border-radius: 50px;
}

.timeline-details { list-style: none; margin-bottom: 16px; }
.timeline-details li {
  color: var(--text-secondary);
  font-size: 0.93rem;
  padding: 4px 0 4px 20px;
  position: relative;
}
.timeline-details li::before {
  content: '>';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-family: var(--font-mono);
  font-weight: 700;
}

.timeline-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.timeline-tags span {
  font-size: 0.75rem;
  padding: 4px 12px;
  background: var(--accent-glow);
  color: var(--accent-light);
  border-radius: 50px;
  font-weight: 500;
}

/* ========== Projects ========== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-secondary));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.5s ease;
}
.project-card:hover::before { transform: scaleX(1); }
.project-card:hover {
  border-color: rgba(var(--particle-color), 0.3);
  transform: translateY(-6px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
}

.project-icon {
  color: var(--accent);
  margin-bottom: 16px;
}
.project-icon svg { stroke: var(--accent); }

.project-label {
  display: inline-block;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--accent-secondary);
  font-weight: 600;
  margin-bottom: 8px;
}

.project-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.project-card p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.7;
  margin-bottom: 16px;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 16px;
}
.project-tech span {
  font-size: 0.72rem;
  padding: 3px 10px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  border-radius: 50px;
  font-weight: 500;
}

.project-impact {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--accent-secondary);
  font-weight: 600;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}
.project-impact svg { stroke: var(--accent-secondary); flex-shrink: 0; }

/* ========== Expertise / What I Deliver ========== */
.expertise-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.expertise-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: all var(--transition);
  position: relative;
}
.expertise-card:hover {
  border-color: rgba(var(--particle-color), 0.4);
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.12);
}

.expertise-icon {
  color: var(--accent);
  margin-bottom: 16px;
}
.expertise-icon svg { stroke: var(--accent); }

.expertise-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 10px;
  line-height: 1.3;
}

.expertise-card p {
  color: var(--text-secondary);
  font-size: 0.87rem;
  line-height: 1.7;
}

/* ========== Skills ========== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.skill-category {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: all var(--transition);
}
.skill-category:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
}

.skill-category h3 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--accent);
  margin-bottom: 20px;
}

.skill-items { display: flex; flex-wrap: wrap; gap: 10px; }

.skill-chip {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 50px;
  font-size: 0.88rem;
  color: var(--text-primary);
  transition: all var(--transition);
}
.skill-chip:hover {
  border-color: var(--accent);
  background: var(--accent-glow);
}

.skill-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--dot-color);
  flex-shrink: 0;
}

/* ========== Certifications ========== */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  max-width: 750px;
  margin: 0 auto;
}

.cert-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px;
  text-align: center;
  position: relative;
  overflow: hidden;
  transition: all var(--transition);
}
.cert-card:hover {
  border-color: var(--accent);
  transform: translateY(-6px);
}

.cert-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  border-radius: 16px;
  background: var(--accent-glow);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 800;
  margin-bottom: 20px;
  border: 2px solid rgba(var(--particle-color), 0.2);
}

.cert-card h3 { font-size: 1.05rem; margin-bottom: 8px; }
.cert-card p { color: var(--text-muted); font-size: 0.9rem; }

.cert-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-secondary));
  transform: scaleX(0);
  transition: transform 0.5s ease;
}
.cert-card:hover .cert-bar { transform: scaleX(1); }

/* ========== Education ========== */
.edu-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 800px;
  margin: 0 auto;
}

.edu-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
  transition: all var(--transition);
}
.edu-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
}

.edu-year {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
  margin-bottom: 12px;
}

.edu-card h3 { font-size: 1.05rem; margin-bottom: 6px; }
.edu-field { color: var(--accent-secondary); font-size: 0.9rem; margin-bottom: 4px; }
.edu-school { color: var(--text-muted); font-size: 0.85rem; }

/* ========== Contact ========== */
.contact-content { text-align: center; max-width: 600px; margin: 0 auto; }

.contact-intro {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 40px;
  line-height: 1.8;
}

.contact-links {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 40px;
}

.contact-card {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 24px;
  color: var(--text-primary) !important;
  transition: all var(--transition);
}
.contact-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  color: var(--text-primary) !important;
}

.contact-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-glow);
  color: var(--accent);
  border-radius: 10px;
  font-weight: 800;
  font-size: 1.1rem;
}
.contact-icon svg { stroke: var(--accent); }

/* ========== Footer ========== */
.footer {
  text-align: center;
  padding: 40px 24px;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.9rem;
  position: relative;
  z-index: 1;
}
.footer strong { color: var(--text-secondary); }
.footer-sub { margin-top: 4px; font-size: 0.8rem; }

/* ========== Animations ========== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* Staggered entry for project cards */
.project-card.fade-in:nth-child(1) { transition-delay: 0s; }
.project-card.fade-in:nth-child(2) { transition-delay: 0.1s; }
.project-card.fade-in:nth-child(3) { transition-delay: 0.2s; }
.project-card.fade-in:nth-child(4) { transition-delay: 0.3s; }

/* ========== Responsive ========== */
@media (max-width: 768px) {
  .nav-toggle { display: flex; }

  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 70%;
    max-width: 300px;
    height: 100vh;
    background: var(--bg-secondary);
    flex-direction: column;
    padding: 80px 32px 32px;
    gap: 24px;
    border-left: 1px solid var(--border);
    transition: right var(--transition);
  }
  .nav-links.open { right: 0; }

  .hero-stats { gap: 20px; }
  .stat-number { font-size: 2rem; }

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

  .projects-grid { grid-template-columns: 1fr; }
  .expertise-grid { grid-template-columns: 1fr; }
  .skills-grid { grid-template-columns: 1fr; }
  .cert-grid { grid-template-columns: 1fr; max-width: 350px; }
  .edu-grid { grid-template-columns: 1fr; max-width: 350px; }

  .timeline::before { left: 0; }
  .timeline-item { padding-left: 30px; }
  .timeline-header { flex-direction: column; gap: 8px; }

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