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

:root {
  --color-bg: #fafafa;
  --color-bg-alt: #f5f3ff;
  --color-text: #1a1a1a;
  --color-text-secondary: #555;
  --color-accent: #6d28d9;
  --color-accent-hover: #5b21b6;
  --color-accent-light: rgba(109, 40, 217, 0.08);
  --color-accent2: #2563eb;
  --color-border: #e0e0e0;
  --color-card-bg: #fff;
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --max-width: 1100px;
  --radius: 12px;
  --gradient: linear-gradient(135deg, #6d28d9, #2563eb);
  --gradient-soft: linear-gradient(135deg, #ede9fe, #dbeafe);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s;
}

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

/* ===== Navigation ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(250, 250, 250, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.nav-inner {
  max-width: calc(var(--max-width) + 4rem);
  margin: 0 auto;
  padding: 0 2rem;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-weight: 700;
  font-size: 1.25rem;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.02em;
}

.nav-logo:hover {
  opacity: 0.8;
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}

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

/* ===== Hero ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 0 2rem;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(109, 40, 217, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(37, 99, 235, 0.06) 0%, transparent 50%),
    var(--color-bg);
}

.hero-content {
  max-width: var(--max-width);
  margin: 0 auto;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 4rem;
}

.hero-text {
  flex: 1;
}

.hero-photo {
  flex-shrink: 0;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  overflow: hidden;
  padding: 4px;
  background: var(--gradient);
  box-shadow:
    0 12px 40px rgba(109, 40, 217, 0.15),
    0 4px 12px rgba(37, 99, 235, 0.1);
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.hero-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  border-radius: 50%;
}

.hero-greeting {
  font-size: 1.1rem;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.hero-name {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 1.25rem;
}

.hero-tagline {
  font-size: 1.2rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  line-height: 1.7;
  margin-bottom: 2rem;
}

.hero-links {
  display: flex;
  gap: 1rem;
}

/* ===== Buttons ===== */
.btn {
  display: inline-block;
  padding: 0.75rem 1.75rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.2s;
}

.btn-primary {
  background: var(--gradient);
  color: #fff;
  box-shadow: 0 4px 14px rgba(109, 40, 217, 0.25);
}

.btn-primary:hover {
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(109, 40, 217, 0.35);
}

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

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

/* ===== Sections ===== */
.section {
  padding: 6rem 2rem;
}

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

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

.section-title {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 3rem;
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 40px;
  height: 3px;
  background: var(--gradient);
  border-radius: 2px;
}

/* ===== About ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 4rem;
}

.about-text p {
  color: var(--color-text-secondary);
  font-size: 1.05rem;
  margin-bottom: 1rem;
  line-height: 1.8;
}

.about-details h3 {
  font-size: 1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
  margin-bottom: 1.5rem;
}

.edu-item {
  display: flex;
  flex-direction: column;
  margin-bottom: 1.25rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--color-border);
}

.edu-item:last-child {
  border-bottom: none;
}

.edu-degree {
  font-weight: 600;
  font-size: 0.95rem;
}

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

.edu-date {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-size: 0.85rem;
  font-weight: 500;
  margin-top: 0.25rem;
}

/* ===== Skills ===== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2.5rem;
}

.skill-group h3 {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  padding: 0.4rem 0.85rem;
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text);
  transition: all 0.2s;
}

.tag:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: var(--color-accent-light);
  transform: translateY(-1px);
}

/* ===== Projects ===== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.project-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
  transition: all 0.3s;
  position: relative;
  overflow: hidden;
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient);
  opacity: 0;
  transition: opacity 0.3s;
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(109, 40, 217, 0.08);
  border-color: rgba(109, 40, 217, 0.2);
}

.project-card:hover::before {
  opacity: 1;
}

.project-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  padding: 0.25rem 0;
  margin-bottom: 0.75rem;
}

.project-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  letter-spacing: -0.01em;
}

.project-card p {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  line-height: 1.65;
  margin-bottom: 1.25rem;
}

.project-meta {
  display: flex;
  gap: 1rem;
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  font-weight: 500;
}

/* ===== Experience / Timeline ===== */
.timeline {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.timeline-item {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 2rem;
}

.timeline-date {
  font-size: 0.85rem;
  font-weight: 600;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  padding-top: 0.15rem;
}

.timeline-content {
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--color-border);
}

.timeline-item:last-child .timeline-content {
  border-bottom: none;
  padding-bottom: 0;
}

.timeline-content h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.timeline-org {
  display: block;
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.timeline-content p {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ===== Contact ===== */
.contact-section {
  text-align: center;
  position: relative;
}

.contact-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, rgba(109, 40, 217, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.contact-text {
  color: var(--color-text-secondary);
  font-size: 1.1rem;
  max-width: 500px;
  margin: 0 auto 2.5rem;
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: 2.5rem;
  flex-wrap: wrap;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--color-text);
  font-weight: 500;
  font-size: 0.95rem;
  transition: all 0.2s;
  padding: 0.75rem 1.25rem;
  border-radius: 10px;
}

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

.contact-item svg {
  flex-shrink: 0;
}

/* ===== Footer ===== */
.footer {
  text-align: center;
  padding: 2rem;
  color: var(--color-text-secondary);
  font-size: 0.85rem;
  border-top: 1px solid var(--color-border);
}

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

.hero-greeting { animation: fadeInUp 0.6s ease-out; }
.hero-name { animation: fadeInUp 0.6s ease-out 0.1s both; }
.hero-tagline { animation: fadeInUp 0.6s ease-out 0.2s both; }
.hero-links { animation: fadeInUp 0.6s ease-out 0.3s both; }
.hero-photo { animation: fadeInUp 0.6s ease-out 0.2s both; }

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .hero-content {
    flex-direction: column-reverse;
    text-align: center;
    gap: 2rem;
  }

  .hero-photo {
    width: 200px;
    height: 200px;
  }

  .hero-links {
    justify-content: center;
  }

  .nav-links {
    gap: 1.25rem;
  }

  .nav-links a {
    font-size: 0.8rem;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .skills-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

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

  .timeline-item {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }

  .contact-links {
    flex-direction: column;
    align-items: center;
    gap: 1.25rem;
  }

  .section {
    padding: 4rem 1.5rem;
  }

  .hero {
    padding: 0 1.5rem;
  }

  .section-title::after {
    left: 50%;
    transform: translateX(-50%);
  }

  .section-title {
    display: block;
    text-align: center;
  }
}