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

:root {
  --color-bg: #e5e5e5;
  --color-surface: #ffffff;
  --color-text: #1a1a1a;
  --color-text-secondary: #555555;
  --color-accent: #14213d;
  --color-accent-light: #e8effc;
  --color-border: #e2e2e2;
  --color-hover: #f0f0f0;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --max-width: 760px;
  --transition: 0.3s ease;
}

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

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: inherit;
  text-decoration: none;
}

.accent {
  color: var(--color-accent);
}

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

/* ===== Navigation ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 2.5rem;
  background: rgba(250, 250, 250, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition);
}

.nav.scrolled {
  border-bottom-color: var(--color-border);
}

.nav-logo {
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-accent);
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 2rem;
}

.nav-links a {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  transition: color var(--transition);
  letter-spacing: 0.01em;
  font-weight: 500;
}

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

/* ===== Hero ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 6rem 2rem 4rem;
  background: linear-gradient(180deg, var(--color-bg) 0%, #f0f4ff 50%, var(--color-bg) 100%);
}

.hero-content {
  max-width: var(--max-width);
}

.hero-photo {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 1.5rem;
  border: 3px solid var(--color-surface);
  box-shadow: 0 4px 24px rgba(26, 86, 219, 0.12), 0 0 0 4px var(--color-accent-light);
}

.hero-greeting {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-bottom: 0.5rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 500;
}

.hero-name {
  font-size: clamp(2.5rem, 6vw, 4.25rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.1;
  margin-bottom: 1rem;
}

.hero-tagline {
  font-size: 1.2rem;
  color: var(--color-text-secondary);
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
  line-height: 1.5;
}

.hero-location {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-bottom: 2.5rem;
  letter-spacing: 0.02em;
}

/* Hero Stats */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-bottom: 2.5rem;
  padding: 1.5rem;
  background: var(--color-surface);
  border-radius: 12px;
  border: 1px solid var(--color-border);
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}

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

.hero-stat-number {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.hero-stat-label {
  display: block;
  font-size: 0.7rem;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: 0.25rem;
  font-weight: 500;
}

/* Hero Actions */
.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-cta {
  display: inline-block;
  padding: 0.8rem 2rem;
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  transition: all var(--transition);
  background: var(--color-accent);
  color: #fff;
  border: 1px solid var(--color-accent);
}

.hero-cta:hover {
  background: #1544b0;
  border-color: #1544b0;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(26, 86, 219, 0.25);
}

.hero-cta-secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border-color: var(--color-border);
}

.hero-cta-secondary:hover {
  background: var(--color-hover);
  border-color: var(--color-border);
  color: var(--color-text);
  box-shadow: 0 4px 12px rgba(0,0,0,0.06);
}

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

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

.section-title {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-accent);
  margin-bottom: 3rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.section-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

/* ===== About ===== */
.about-content p {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--color-text);
  margin-bottom: 1.5rem;
}

.about-content p:last-child {
  margin-bottom: 0;
}

/* About Tags */
.about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 2rem;
}

.tag {
  display: inline-block;
  padding: 0.35rem 0.85rem;
  font-size: 0.8rem;
  font-weight: 500;
  background: var(--color-accent-light);
  color: var(--color-accent);
  border-radius: 20px;
  letter-spacing: 0.01em;
}

/* ===== Experience Timeline ===== */
.timeline {
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 2px;
  background: linear-gradient(180deg, var(--color-accent) 0%, var(--color-border) 100%);
  border-radius: 1px;
}

.timeline-item {
  position: relative;
  padding-bottom: 3rem;
}

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

.timeline-marker {
  position: absolute;
  left: -2rem;
  top: 0.35rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-accent);
  transform: translateX(-4px);
  box-shadow: 0 0 0 3px var(--color-accent-light);
}

.timeline-header {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 0.25rem;
}

.timeline-logo {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  object-fit: contain;
  flex-shrink: 0;
  margin-top: 0.1rem;
  border: 1px solid var(--color-border);
  padding: 4px;
  background: var(--color-surface);
}

.timeline-date {
  font-size: 0.78rem;
  color: var(--color-accent);
  letter-spacing: 0.03em;
  display: block;
  margin-bottom: 0.35rem;
  font-weight: 600;
}

.timeline-role {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 0.2rem;
}

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

.timeline-subtitle {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  font-style: italic;
  margin-bottom: 0.75rem;
}

.timeline-highlights {
  list-style: none;
  padding: 0;
}

.timeline-highlights li {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.65;
  padding-left: 1.25rem;
  position: relative;
  margin-bottom: 0.6rem;
}

.timeline-highlights li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55rem;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--color-accent-light);
  border: 1px solid var(--color-accent);
}

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

.timeline-highlights li strong {
  color: var(--color-text);
}

.timeline-description {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ===== Education ===== */
.education-item {
  margin-bottom: 2rem;
  padding: 1.5rem;
  background: var(--color-surface);
  border-radius: 10px;
  border: 1px solid var(--color-border);
}

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

.education-degree {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 0.25rem;
}

.education-school {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  margin-bottom: 0.25rem;
}

.education-date {
  font-size: 0.78rem;
  color: var(--color-accent);
  letter-spacing: 0.03em;
  display: block;
  margin-bottom: 0.75rem;
  font-weight: 600;
}

.education-details {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 0.35rem;
}

/* ===== Skills ===== */
.skills-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.skills-category {
  padding: 1.25rem;
  background: var(--color-surface);
  border-radius: 10px;
  border: 1px solid var(--color-border);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.skills-category:hover {
  border-color: var(--color-accent-light);
  box-shadow: 0 2px 8px rgba(26, 86, 219, 0.06);
}

.skills-label {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
  color: var(--color-accent);
}

.skills-list {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.65;
}

/* ===== Contact ===== */
.contact {
  text-align: center;
  padding: 8rem 2rem;
  background: linear-gradient(180deg, var(--color-bg) 0%, #f0f4ff 100%);
}

.contact-text {
  font-size: 1.15rem;
  color: var(--color-text-secondary);
  margin-bottom: 1.5rem;
}

.contact-email {
  display: inline-block;
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--color-accent);
  border-bottom: 2px solid var(--color-accent-light);
  padding-bottom: 0.15rem;
  transition: border-color var(--transition);
}

.contact-email:hover {
  border-bottom-color: var(--color-accent);
}

.contact-links {
  margin-top: 2rem;
  display: flex;
  justify-content: center;
  gap: 1.5rem;
}

.contact-link {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  font-weight: 500;
  transition: color var(--transition);
}

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

/* ===== Footer ===== */
.footer {
  text-align: center;
  padding: 2rem;
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  border-top: 1px solid var(--color-border);
}

/* ===== Animations ===== */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

/* ===== Responsive ===== */
@media (max-width: 640px) {
  .nav {
    padding: 1rem 1.5rem;
  }

  .nav-links {
    gap: 1.25rem;
  }

  .section {
    padding: 4rem 1.5rem;
  }

  .contact {
    padding: 5rem 1.5rem;
  }

  .hero {
    padding: 5rem 1.5rem 3rem;
  }

  .hero-name {
    font-size: 2.25rem;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }

  .hero-stat-number {
    font-size: 1.25rem;
  }

  .timeline {
    padding-left: 1.5rem;
  }

  .timeline-marker {
    left: -1.5rem;
  }

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