@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  --bg-color: #0a0a0c;
  --bg-secondary: #121214;
  --bg-tertiary: #1a1a1e;
  --text-primary: #ededef;
  --text-secondary: #a1a1aa;
  --accent-color: #3b82f6;
  --accent-hover: #60a5fa;
  --border-color: #27272a;
  --font-family: 'Inter', sans-serif;
  --transition: all 0.3s ease;
}

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

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

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

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

/* Layout */
.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* Navigation */
nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 2rem 0;
  position: sticky;
  top: 0;
  background-color: rgba(10, 10, 12, 0.9);
  backdrop-filter: blur(10px);
  z-index: 100;
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.05em;
}

.nav-links {
  display: flex;
  gap: 1.5rem;
}

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

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

/* Hero Section */
.hero {
  padding: 8rem 0 6rem 0;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  max-width: 850px;
}

.hero-subtitle {
  color: var(--accent-color);
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.hero h1 {
  font-size: clamp(3rem, 5vw, 5rem);
  margin-bottom: 1.5rem;
  color: #ffffff;
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 700px;
  margin-bottom: 2.5rem;
  font-weight: 300;
}

/* Contact Grid */
.contact-grid {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.contact-card {
  display: flex;
  align-items: center;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 0.75rem 1.25rem;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition);
}

.contact-card:hover {
  border-color: var(--text-secondary);
  background-color: var(--bg-tertiary);
  transform: translateY(-2px);
}

.contact-card svg {
  margin-right: 0.75rem;
  width: 18px;
  height: 18px;
  color: var(--text-secondary);
  transition: var(--transition);
}

.contact-card:hover svg {
  color: var(--text-primary);
}

/* Sections */
section {
  padding: 5rem 0;
  border-top: 1px solid var(--border-color);
}

.section-header {
  margin-bottom: 3rem;
}

.section-header h2 {
  font-size: 2rem;
  color: #ffffff;
}

/* Timeline */
.timeline {
  border-left: 2px solid var(--border-color);
  padding-left: 2rem;
  margin-left: 0.5rem;
}

.timeline-item {
  position: relative;
  margin-bottom: 4rem;
}

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

.timeline-item::before {
  content: '';
  position: absolute;
  left: -2.35rem;
  top: 0.35rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--accent-color);
  border: 3px solid var(--bg-color);
  transition: var(--transition);
}

.timeline-item:hover::before {
  background-color: var(--text-primary);
  transform: scale(1.2);
}

.timeline-date {
  color: var(--accent-color);
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: block;
}

.timeline-title {
  font-size: 1.5rem;
  color: #fff;
  margin-bottom: 0.25rem;
}

.timeline-company {
  font-size: 1.1rem;
  color: #d4d4d8;
  margin-bottom: 1rem;
  font-weight: 500;
}

.timeline-content {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.7;
}

.timeline-content ul {
  list-style-type: none;
  margin-top: 1rem;
}

.timeline-content li {
  margin-bottom: 0.75rem;
  position: relative;
  padding-left: 1.5rem;
}

.timeline-content li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--text-secondary);
  font-weight: bold;
}

/* Expertise Grid */
.expertise-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.expertise-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 2.5rem;
  border-radius: 12px;
  transition: var(--transition);
}

.expertise-card:hover {
  transform: translateY(-5px);
  border-color: var(--text-secondary);
  background-color: var(--bg-tertiary);
}

.expertise-card h3 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
  color: #fff;
}

.expertise-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
}

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

.tag {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  padding: 0.35rem 0.85rem;
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 500;
  border: 1px solid var(--border-color);
}

/* Projects */
.project-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  overflow: hidden;
  transition: var(--transition);
}

.project-card:hover {
  border-color: var(--text-secondary);
}

.project-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  min-height: 300px;
}

.project-content {
  padding: 3rem 3rem 3rem 0;
}

@media (max-width: 768px) {
  .project-card {
    grid-template-columns: 1fr;
  }
  .project-content {
    padding: 2rem;
  }
  .project-image {
    min-height: 250px;
  }
}

.project-content h3 {
  font-size: 1.75rem;
  margin-bottom: 1rem;
  color: #fff;
}

.project-content p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  background-color: #ffffff;
  color: #000000;
  border-radius: 6px;
  font-weight: 500;
  font-size: 0.9rem;
  transition: var(--transition);
}

.btn:hover {
  background-color: #e4e4e7;
  transform: translateY(-2px);
}

/* Publications */
.pub-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.pub-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 2rem;
  border-radius: 12px;
  transition: var(--transition);
}

.pub-item:hover {
  border-color: var(--text-secondary);
  background-color: var(--bg-tertiary);
}

.pub-year {
  display: inline-block;
  background: var(--accent-color);
  color: #fff;
  padding: 0.25rem 0.75rem;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.pub-title {
  font-size: 1.15rem;
  color: #fff;
  margin-bottom: 0.75rem;
  line-height: 1.5;
}

.pub-venue {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
}

.pub-link {
  display: inline-flex;
  align-items: center;
  color: var(--text-primary);
  font-size: 0.9rem;
  font-weight: 500;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}

.pub-link svg {
  margin-left: 0.35rem;
  width: 14px;
  height: 14px;
  transition: transform 0.2s ease;
}

.pub-link:hover {
  border-bottom-color: var(--text-primary);
}

.pub-link:hover svg {
  transform: translate(2px, -2px);
}

/* Footer */
footer {
  padding: 3rem 0;
  border-top: 1px solid var(--border-color);
  text-align: center;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.footer-content a {
  color: var(--text-secondary);
}

.footer-content a:hover {
  color: var(--text-primary);
}

@media (max-width: 640px) {
  .footer-content {
    flex-direction: column;
    gap: 1rem;
  }
  .nav-links {
    display: none; /* simple mobile nav approach for minimalism */
  }
}

/* Blog Layout */
.blog-container {
  max-width: 700px;
  margin: 0 auto;
  padding: 6rem 2rem;
}

.blog-header {
  margin-bottom: 4rem;
}

.blog-meta {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 1rem;
  display: block;
}

.blog-title {
  font-size: clamp(2.5rem, 4vw, 3.5rem);
  margin-bottom: 1.5rem;
  color: #ffffff;
}

.blog-content {
  font-size: 1.125rem;
  line-height: 1.8;
  color: #d4d4d8;
}

.blog-content p {
  margin-bottom: 1.5rem;
}

.blog-content h2 {
  margin-top: 3rem;
  margin-bottom: 1rem;
  color: #ffffff;
}

.blog-content pre {
  background: var(--bg-secondary);
  padding: 1.5rem;
  border-radius: 8px;
  overflow-x: auto;
  margin: 2rem 0;
  border: 1px solid var(--border-color);
  font-size: 0.95rem;
}

.blog-content code {
  font-family: 'Courier New', Courier, monospace;
}

.back-link {
  display: inline-flex;
  align-items: center;
  color: var(--text-secondary);
  margin-bottom: 4rem;
  font-size: 0.9rem;
}

.back-link:hover {
  color: var(--text-primary);
}

.back-link svg {
  margin-right: 0.5rem;
  width: 16px;
  height: 16px;
}

/* Comments Section */
.comments-section {
  margin-top: 4rem;
  padding-top: 3rem;
  border-top: 1px solid var(--border-color);
}

.comments-section h3 {
  font-size: 1.5rem;
  color: #fff;
  margin-bottom: 2rem;
}

.comment-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 3rem;
}

.comment-form input,
.comment-form textarea {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 1rem;
  border-radius: 8px;
  color: var(--text-primary);
  font-family: var(--font-family);
  font-size: 0.95rem;
  transition: var(--transition);
}

.comment-form input:focus,
.comment-form textarea:focus {
  outline: none;
  border-color: var(--accent-color);
}

.comment-form button {
  align-self: flex-start;
  cursor: pointer;
}

.comment {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 1.5rem;
  border-radius: 8px;
  margin-bottom: 1.5rem;
}

.comment-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.comment-author {
  font-weight: 600;
  color: #fff;
}

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

.comment-body {
  color: #d4d4d8;
  font-size: 0.95rem;
  line-height: 1.6;
}