/* ===== CSS Variables ===== */
:root {
  --color-bg: #0a0a0b;
  --color-bg-secondary: #111113;
  --color-bg-card: #18181b;
  --color-border: #27272a;
  --color-text: #fafafa;
  --color-text-secondary: #a1a1aa;
  --color-accent: #6366f1;
  --color-accent-hover: #818cf8;
  --color-accent-subtle: rgba(99, 102, 241, 0.1);
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --max-width: 1100px;
  --radius: 12px;
  --transition: 0.3s ease;
}

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

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

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

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

ul {
  list-style: none;
}

img {
  max-width: 100%;
  display: block;
}

/* ===== Container ===== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Navbar ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 20px 0;
  transition: var(--transition);
}

.navbar.scrolled {
  background: rgba(10, 10, 11, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  padding: 12px 0;
}

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

.nav-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: -0.5px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

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

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

.nav-cta {
  background: var(--color-accent);
  color: var(--color-text) !important;
  padding: 8px 20px;
  border-radius: 8px;
  transition: background var(--transition) !important;
}

.nav-cta:hover {
  background: var(--color-accent-hover) !important;
}

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

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

.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);
}

/* ===== Section Title ===== */
.section-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 48px;
  letter-spacing: -0.5px;
  position: relative;
  display: inline-block;
}

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

/* ===== Hero ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 80px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.hero-content {
  max-width: 680px;
}

.hero-greeting {
  font-size: 1rem;
  color: var(--color-accent);
  font-weight: 500;
  margin-bottom: 16px;
}

.hero-name {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 700;
  letter-spacing: -1.5px;
  line-height: 1.1;
  margin-bottom: 8px;
}

.hero-title {
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  font-weight: 600;
  color: var(--color-text-secondary);
  letter-spacing: -0.5px;
  margin-bottom: 24px;
}

.hero-description {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  max-width: 520px;
  margin: 0 auto 40px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  padding: 14px 28px;
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 600;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
}

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

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

.btn-outline {
  background: transparent;
  color: var(--color-accent);
  border: 2px solid var(--color-accent);
}

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

/* ===== About ===== */
.about {
  padding: 100px 0;
}

.about-content {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 64px;
  align-items: start;
}

.about-text p {
  color: var(--color-text-secondary);
  margin-bottom: 16px;
  font-size: 1rem;
  line-height: 1.8;
}

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

.about-details {
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding: 32px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.detail-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.detail-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--color-accent);
}

.detail-value {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
}

/* ===== Experience ===== */
.experience {
  padding: 100px 0;
  background: var(--color-bg-secondary);
}

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

.timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--color-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(--color-bg-secondary);
  border: 2px solid var(--color-border);
  z-index: 1;
  transition: var(--transition);
}

.timeline-item.highlight .timeline-marker {
  border-color: var(--color-accent);
  background: var(--color-accent);
  box-shadow: 0 0 0 4px var(--color-accent-subtle);
}

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

.timeline-content:hover {
  border-color: var(--color-accent);
  transform: translateX(4px);
}

.timeline-item.highlight .timeline-content {
  border-color: rgba(99, 102, 241, 0.3);
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.timeline-role {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 2px;
}

.timeline-company {
  color: var(--color-accent);
  font-weight: 500;
  font-size: 0.95rem;
}

.timeline-date {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  white-space: nowrap;
  padding: 4px 12px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 6px;
}

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

.timeline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.tag {
  padding: 4px 12px;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 500;
  background: var(--color-accent-subtle);
  color: var(--color-accent-hover);
  border: 1px solid rgba(99, 102, 241, 0.2);
}

/* ===== Skills ===== */
.skills {
  padding: 100px 0;
}

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

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

.skill-category:hover {
  border-color: var(--color-accent);
  transform: translateY(-4px);
}

.skill-icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: var(--color-accent-subtle);
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.skill-category h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.skill-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.skill-list li {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  padding-left: 16px;
  position: relative;
}

.skill-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
}

/* ===== Education ===== */
.education {
  padding: 100px 0;
  background: var(--color-bg-secondary);
}

.education-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

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

.education-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-4px);
}

.education-card.featured {
  border-color: rgba(99, 102, 241, 0.3);
  background: linear-gradient(135deg, var(--color-bg-card), rgba(99, 102, 241, 0.05));
}

.education-date {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.education-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 8px 0 4px;
}

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

.education-badge {
  display: inline-block;
  margin-top: 12px;
  padding: 4px 12px;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  background: var(--color-accent-subtle);
  color: var(--color-accent-hover);
  border: 1px solid rgba(99, 102, 241, 0.2);
}

/* ===== Contact ===== */
.contact {
  padding: 100px 0;
  text-align: center;
}

.contact-text {
  color: var(--color-text-secondary);
  font-size: 1.1rem;
  max-width: 520px;
  margin: 0 auto 48px;
  line-height: 1.8;
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

.contact-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 28px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: all var(--transition);
  color: var(--color-text-secondary);
  font-size: 0.95rem;
}

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

.contact-card svg {
  color: var(--color-accent);
  flex-shrink: 0;
}

/* ===== Footer ===== */
.footer {
  padding: 32px 0;
  border-top: 1px solid var(--color-border);
  text-align: center;
}

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

/* ===== Scroll Reveal Animation ===== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.timeline-item.reveal:nth-child(2) { transition-delay: 0.1s; }
.timeline-item.reveal:nth-child(3) { transition-delay: 0.2s; }
.timeline-item.reveal:nth-child(4) { transition-delay: 0.3s; }

.skill-category.reveal:nth-child(2) { transition-delay: 0.1s; }
.skill-category.reveal:nth-child(3) { transition-delay: 0.2s; }
.skill-category.reveal:nth-child(4) { transition-delay: 0.3s; }

.education-card.reveal:nth-child(2) { transition-delay: 0.1s; }
.education-card.reveal:nth-child(3) { transition-delay: 0.2s; }
.education-card.reveal: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: 280px;
    height: 100vh;
    background: var(--color-bg-card);
    flex-direction: column;
    align-items: flex-start;
    padding: 80px 32px 32px;
    gap: 24px;
    transition: right var(--transition);
    border-left: 1px solid var(--color-border);
  }

  .nav-links.active {
    right: 0;
  }

  .nav-links a {
    font-size: 1rem;
  }

  .hero {
    padding-top: 100px;
    min-height: auto;
    padding-bottom: 60px;
  }

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

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

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

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

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

  .timeline-header {
    flex-direction: column;
  }

  .section-title {
    font-size: 1.6rem;
  }

  .about,
  .experience,
  .skills,
  .education,
  .contact {
    padding: 64px 0;
  }

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

@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
  }

  .btn {
    justify-content: center;
    width: 100%;
  }

  .hero-description {
    font-size: 1rem;
  }
}