/* ===== Design Tokens ===== */
:root {
  --bg-primary: #0b1121;
  --bg-secondary: #101829;
  --bg-card: rgba(16, 24, 48, 0.65);
  --bg-glass: rgba(16, 24, 48, 0.45);
  --border-card: rgba(100, 120, 160, 0.12);
  --accent: #3b82f6;
  --accent-light: #60a5fa;
  --accent-dim: rgba(59, 130, 246, 0.1);
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --font-main: 'Inter', system-ui, -apple-system, sans-serif;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --transition: 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
  scrollbar-width: thin;
  scrollbar-color: var(--accent) var(--bg-secondary);
}

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

a { color: var(--accent-light); text-decoration: none; transition: var(--transition); }
a:hover { color: #fff; }
img { max-width: 100%; display: block; }

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

/* ===== Navbar ===== */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 18px 0;
  transition: var(--transition);
}

.navbar.scrolled {
  padding: 10px 0;
  background: rgba(11, 17, 33, 0.9);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-card);
}

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

.nav-logo {
  font-size: 1.4rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.5px;
}

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

.nav-links {
  display: flex;
  list-style: none;
  gap: 28px;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.88rem;
  font-weight: 500;
  position: relative;
  padding-bottom: 4px;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0;
  width: 0; height: 2px;
  background: var(--accent);
  transition: var(--transition);
  border-radius: 1px;
}

.nav-links a:hover,
.nav-links a.active { color: #fff; }

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

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

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

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

#particles-canvas {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 680px;
}

.hero-greeting {
  font-size: 1rem;
  color: var(--accent-light);
  font-weight: 500;
  margin-bottom: 10px;
  letter-spacing: 1px;
}

.hero-name {
  font-size: clamp(2.5rem, 5.5vw, 4rem);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 14px;
  color: #fff;
}

.hero-title {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  margin-bottom: 10px;
  font-weight: 400;
}

.hero-typing {
  font-size: 0.95rem;
  color: var(--accent-light);
  margin-bottom: 32px;
  min-height: 26px;
  font-weight: 500;
}

.hero-typing .cursor {
  display: inline-block;
  width: 2px; height: 1.1em;
  background: var(--accent-light);
  margin-left: 2px;
  animation: blink 1s step-end infinite;
  vertical-align: text-bottom;
}

@keyframes blink { 50% { opacity: 0; } }

.hero-btns {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  font-family: var(--font-main);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: #2563eb;
  transform: translateY(-1px);
  color: #fff;
}

.btn-outline {
  background: transparent;
  color: var(--accent-light);
  border: 1.5px solid rgba(59, 130, 246, 0.4);
}

.btn-outline:hover {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: #fff;
}

/* ===== Sections ===== */
section { padding: 90px 0; }

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-label {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent-light);
  margin-bottom: 10px;
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.4rem);
  font-weight: 800;
  margin-bottom: 14px;
  color: #fff;
}

.section-line {
  width: 48px; height: 3px;
  background: var(--accent);
  margin: 0 auto;
  border-radius: 2px;
}

/* ===== About ===== */
.about-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 48px;
  align-items: center;
}

.about-image {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: 2px solid var(--border-card);
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: 20px;
  font-size: 1rem;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 28px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 20px 14px;
  text-align: center;
  transition: var(--transition);
}

.stat-card:hover {
  border-color: rgba(59, 130, 246, 0.3);
  transform: translateY(-2px);
}

.stat-number {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--accent-light);
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 4px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* ===== Skills ===== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

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

.skill-category:hover {
  border-color: rgba(59, 130, 246, 0.25);
  transform: translateY(-2px);
}

.skill-icon {
  width: 40px; height: 40px;
  background: var(--accent-dim);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: var(--accent-light);
  margin-bottom: 16px;
}

.skill-category h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: #fff;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.skill-tag {
  padding: 5px 12px;
  background: var(--accent-dim);
  border: 1px solid rgba(59, 130, 246, 0.15);
  border-radius: 6px;
  font-size: 0.8rem;
  color: var(--accent-light);
  transition: var(--transition);
}

.skill-tag:hover {
  background: rgba(59, 130, 246, 0.18);
  border-color: rgba(59, 130, 246, 0.35);
}

/* ===== Experience Timeline ===== */
.timeline {
  position: relative;
  max-width: 780px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 35px;
  top: 0; bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent), rgba(59, 130, 246, 0.15));
}

.timeline-item {
  position: relative;
  padding-left: 80px;
  margin-bottom: 40px;
}

.timeline-dot {
  position: absolute;
  left: 28px; top: 8px;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--bg-primary);
}

.timeline-date {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-light);
  letter-spacing: 0.5px;
  margin-bottom: 6px;
}

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

.timeline-card:hover {
  border-color: rgba(59, 130, 246, 0.25);
}

.timeline-card-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 12px;
}

.timeline-logo {
  width: 48px;
  height: 48px;
  object-fit: contain;
  border-radius: 8px;
  flex-shrink: 0;
}

.timeline-card-header h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 2px;
}

.timeline-card .role {
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 400;
}

.timeline-card ul {
  list-style: none;
  margin-top: 12px;
}

.timeline-card li {
  position: relative;
  padding-left: 16px;
  color: var(--text-secondary);
  font-size: 0.88rem;
  margin-bottom: 5px;
}

.timeline-card li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--text-muted);
}

/* ===== Education ===== */
.education-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  max-width: 780px;
  margin: 0 auto;
}

.edu-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: var(--transition);
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.edu-card:hover {
  border-color: rgba(59, 130, 246, 0.25);
  transform: translateY(-2px);
}

.edu-logo {
  width: 56px;
  height: 56px;
  object-fit: contain;
  border-radius: 8px;
  flex-shrink: 0;
}

.edu-info h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 4px;
  color: #fff;
}

.edu-info .edu-dept {
  color: var(--text-secondary);
  font-size: 0.88rem;
  margin-bottom: 4px;
}

.edu-info .edu-year {
  color: var(--text-muted);
  font-size: 0.82rem;
}

.edu-info .edu-badge {
  display: inline-block;
  margin-top: 10px;
  padding: 3px 10px;
  font-size: 0.72rem;
  font-weight: 600;
  background: var(--accent-dim);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: 5px;
  color: var(--accent-light);
}

/* ===== Contact ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  max-width: 850px;
  margin: 0 auto;
}

.contact-info h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: #fff;
}

.contact-info p {
  color: var(--text-secondary);
  margin-bottom: 28px;
  line-height: 1.7;
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.contact-link {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  transition: var(--transition);
}

.contact-link:hover { color: var(--accent-light); }

.contact-link-icon {
  width: 38px; height: 38px;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: var(--accent-light);
  flex-shrink: 0;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-main);
  font-size: 0.9rem;
  transition: var(--transition);
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: rgba(59, 130, 246, 0.4);
}

.form-group textarea {
  min-height: 130px;
  resize: vertical;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-muted);
}

.form-status {
  font-size: 0.85rem;
  text-align: center;
  min-height: 22px;
}

.form-status.success { color: #4ade80; }
.form-status.error { color: #f87171; }

/* ===== Footer ===== */
.footer {
  border-top: 1px solid var(--border-card);
  padding: 36px 0;
}

.footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
}

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

.footer-socials {
  display: flex;
  gap: 10px;
}

.footer-socials a {
  width: 36px; height: 36px;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: var(--transition);
  font-size: 0.9rem;
}

.footer-socials a:hover {
  border-color: rgba(59, 130, 246, 0.3);
  color: var(--accent-light);
}

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

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

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 0; right: -100%;
    width: 75%; height: 100vh;
    background: rgba(11, 17, 33, 0.97);
    backdrop-filter: blur(16px);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 24px;
    transition: var(--transition);
    z-index: 999;
  }
  .nav-links.open { right: 0; }
  .hamburger { display: flex; z-index: 1001; }
  .hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
  .hamburger.active span:nth-child(2) { opacity: 0; }
  .hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

  .about-grid { grid-template-columns: 1fr; gap: 32px; }
  .about-image { max-width: 240px; margin: 0 auto; }
  .contact-grid { grid-template-columns: 1fr; }
  .edu-card { flex-direction: column; align-items: center; text-align: center; }
  section { padding: 64px 0; }
  .footer .container { justify-content: center; text-align: center; }
}

@media (max-width: 480px) {
  .about-stats { grid-template-columns: 1fr; }
  .hero-btns { flex-direction: column; }
  .btn { width: 100%; justify-content: center; }
}