:root {
  --primary: #6366f1;
  --primary-soft: #818cf8;
  --dark: #0f172a;
  --darker: #020617;
  --light: #f8fafc;
  --surface: #1e293b;
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --accent: #f59e0b;
  --border: #334155;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --transition: all 0.2s ease;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--dark);
  color: var(--text);
  font-family: 'Poppins', sans-serif;
  font-weight: 300;
  line-height: 1.7;
}

a {
  color: var(--primary-soft);
  text-decoration: none;
  transition: var(--transition);
}

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

ul {
  list-style: none;
}

img {
  height: auto;
  max-width: 100%;
}

.container {
  margin: 0 auto;
  max-width: 1100px;
  padding: 0 var(--spacing-md);
  width: 100%;
}

/* --- Buttons --- */

.btn {
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: inline-block;
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  padding: 0.75rem 1.75rem;
  text-align: center;
  transition: var(--transition);
}

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

.btn.primary:hover {
  background-color: var(--primary-soft);
  box-shadow: 0 0 20px rgba(99, 102, 241, 0.3);
}

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

.btn.secondary:hover {
  border-color: var(--primary);
  color: var(--primary-soft);
}

/* --- Header & Nav --- */

header {
  background-color: var(--darker);
  padding: var(--spacing-md) 0;
}

nav {
  align-items: center;
  display: flex;
  justify-content: flex-end;
  padding: var(--spacing-xs) 0;
}

.nav-links {
  display: flex;
  gap: var(--spacing-md);
}

.nav-links a {
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 400;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

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

/* --- Hero --- */

.hero {
  align-items: center;
  display: flex;
  gap: var(--spacing-lg);
  justify-content: space-between;
  padding: var(--spacing-xl) 0 var(--spacing-lg);
}

.hero-content {
  flex: 1;
}

.hero-image {
  align-items: center;
  display: flex;
  flex: 0 0 auto;
  justify-content: center;
}

.profile-image {
  border: 3px solid var(--border);
  border-radius: 50%;
  max-width: 260px;
  opacity: 0.95;
}

.hero h1 {
  color: var(--light);
  font-size: 3.2rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: var(--spacing-xs);
}

.hero h2 {
  color: var(--primary-soft);
  font-size: 1.3rem;
  font-weight: 300;
  margin-bottom: var(--spacing-sm);
}

.hero p {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 520px;
}

.cta-buttons {
  display: flex;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
}

/* --- Sections --- */

.section {
  padding: var(--spacing-xl) 0;
}

.section.accent {
  background-color: var(--darker);
}

.section-title {
  color: var(--light);
  font-size: 1.8rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: var(--spacing-lg);
  text-align: center;
  width: 100%;
}

.section-title::after {
  background-color: var(--primary);
  border-radius: 2px;
  content: "";
  display: block;
  height: 3px;
  margin: 12px auto 0;
  width: 40px;
}

.accent .section-title::after {
  background-color: var(--accent);
}

/* --- About --- */

.about-content {
  font-size: 1.05rem;
  margin: 0 auto;
  max-width: 720px;
  text-align: center;
}

.about-content p {
  color: var(--text-muted);
  margin-bottom: var(--spacing-md);
}

/* --- Skills --- */

.skills-grid {
  display: grid;
  gap: var(--spacing-md);
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.skill-category {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  transition: var(--transition);
}

.skill-category:hover {
  border-color: var(--primary);
}

.skill-category h3 {
  color: var(--light);
  font-size: 1rem;
  font-weight: 500;
  margin-bottom: var(--spacing-sm);
}

.skill-category ul li {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 6px;
  padding-left: var(--spacing-sm);
  position: relative;
}

.skill-category ul li::before {
  color: var(--primary-soft);
  content: "›";
  font-weight: 600;
  left: 0;
  position: absolute;
}

/* --- Timeline --- */

.timeline {
  margin: 0 auto;
  max-width: 720px;
  position: relative;
}

.timeline::before {
  background-color: var(--border);
  bottom: 0;
  content: "";
  left: 7px;
  position: absolute;
  top: 8px;
  width: 1px;
}

.timeline-item {
  margin-bottom: var(--spacing-lg);
  padding-left: var(--spacing-lg);
  position: relative;
}

.timeline-marker {
  background-color: var(--primary);
  border: 2px solid var(--dark);
  border-radius: 50%;
  height: 14px;
  left: 1px;
  position: absolute;
  top: 8px;
  width: 14px;
}

.timeline-content {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  transition: var(--transition);
}

.timeline-content:hover {
  border-color: var(--primary);
}

.timeline-content h3 {
  color: var(--light);
  font-weight: 500;
  margin-bottom: 4px;
}

.timeline-date {
  color: var(--primary-soft);
  font-size: 0.85rem;
  margin-bottom: var(--spacing-sm);
}

.timeline-content p:last-child {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.view-more {
  margin-top: var(--spacing-lg);
  text-align: center;
}

/* --- Writing / Articles --- */

.writing-intro {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin-bottom: var(--spacing-md);
  text-align: center;
}

.article-grid {
  display: grid;
  gap: var(--spacing-md);
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  margin-top: var(--spacing-md);
}

.article-card {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  transition: var(--transition);
}

.article-card:hover {
  border-color: var(--primary);
}

.article-card h3 {
  color: var(--light);
  font-size: 1.1rem;
  font-weight: 500;
  margin-bottom: var(--spacing-xs);
}

.article-card p {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: var(--spacing-sm);
}

.article-link {
  color: var(--primary-soft);
  font-size: 0.85rem;
  font-weight: 500;
}

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

/* --- Contact --- */

.contact-info {
  display: grid;
  gap: var(--spacing-md);
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  margin: 0 auto;
  max-width: 800px;
}

.contact-item {
  align-items: center;
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  padding: var(--spacing-md);
  text-align: center;
  transition: var(--transition);
}

.contact-item:hover {
  border-color: var(--primary);
}

.contact-item h3 {
  align-items: center;
  color: var(--light);
  display: flex;
  font-size: 1rem;
  font-weight: 500;
  gap: 0.5rem;
  margin-bottom: var(--spacing-xs);
}

.contact-item h3 i {
  color: var(--primary-soft);
  font-size: 1.2rem;
}

.contact-item p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.contact-item a {
  color: var(--primary-soft);
}

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

.location-text {
  color: var(--text-muted);
}

/* --- Footer --- */

footer {
  background-color: var(--darker);
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.85rem;
  padding: var(--spacing-md) 0;
  text-align: center;
}

/* --- Hamburger --- */

.hamburger {
  background: none;
  border: none;
  cursor: pointer;
  display: none;
  outline: none;
  padding: 10px;
  position: relative;
  z-index: 1000;
}

.hamburger span {
  background-color: var(--text-muted);
  border-radius: 2px;
  display: block;
  height: 2px;
  margin: 5px 0;
  transition: all 0.3s ease;
  width: 22px;
}

/* --- Mobile --- */

@media (max-width: 768px) {
  nav {
    background-color: var(--darker);
    box-shadow: 0 1px 0 var(--border);
    left: 0;
    padding: var(--spacing-xs) var(--spacing-md);
    position: fixed;
    right: 0;
    top: 0;
    z-index: 1000;
  }

  header {
    padding-top: calc(var(--spacing-md) + 50px);
  }

  .hero {
    flex-direction: column-reverse;
    padding: var(--spacing-md) 0;
    text-align: center;
  }

  .hero h1 {
    font-size: 2.2rem;
  }

  .hero h2 {
    font-size: 1.1rem;
  }

  .hero p {
    font-size: 0.95rem;
  }

  .profile-image {
    margin-bottom: var(--spacing-md);
    max-width: 180px;
  }

  .cta-buttons {
    justify-content: center;
  }

  .hamburger {
    display: block;
  }

  .nav-links {
    align-items: center;
    background-color: var(--darker);
    display: flex;
    flex-direction: column;
    height: 100vh;
    justify-content: center;
    position: fixed;
    right: -100%;
    top: 0;
    transition: right 0.3s ease;
    width: 70%;
    z-index: 999;
  }

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

  .nav-links li {
    margin: 15px 0;
  }

  .hamburger.active span:first-child {
    transform: rotate(45deg) translate(5px, 5px);
  }

  .hamburger.active span:nth-child(2) {
    opacity: 0;
  }

  .hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
  }

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

  .timeline::before {
    left: 7px;
  }

  .timeline-marker {
    left: 1px;
  }

  .timeline-item {
    padding-left: var(--spacing-md);
  }

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