/* ============================================
   Hudeifa Hassan - Personal Website
   Minimal dark theme, monospace aesthetic
   ============================================ */

:root {
  --bg: #0a0a0a;
  --bg-secondary: #111111;
  --fg: #e4e4e7;
  --fg-muted: #a1a1aa;
  --fg-dim: #71717a;
  --accent: #60a5fa;
  --accent-hover: #93bbfd;
  --border: #27272a;
  --green: #4ade80;
  --yellow: #facc15;
  --red: #f87171;
  --cyan: #22d3ee;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', 'Cascadia Code', 'Consolas', monospace;
  --max-width: 720px;
  --transition: 0.2s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-mono);
  background-color: var(--bg);
  color: var(--fg);
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection {
  background: var(--accent);
  color: var(--bg);
}

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

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

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

/* Navigation */
nav {
  padding: 32px 0 0;
  margin-bottom: 64px;
}

nav .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand {
  font-size: 16px;
  font-weight: 600;
  color: var(--fg);
  letter-spacing: -0.02em;
}

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

.nav-links {
  display: flex;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  color: var(--fg-muted);
  font-size: 14px;
  transition: color var(--transition);
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--fg);
}

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--accent);
}

/* Mobile menu */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--fg-muted);
  font-size: 20px;
  cursor: pointer;
  font-family: var(--font-mono);
}

/* Hero / Bio section */
.hero {
  margin-bottom: 80px;
}

.hero h1 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: -0.03em;
  color: var(--fg);
}

.hero .tagline {
  color: var(--fg-muted);
  font-size: 15px;
  margin-bottom: 24px;
}

.hero .bio {
  color: var(--fg-muted);
  font-size: 14px;
  line-height: 1.8;
  max-width: 600px;
}

.hero .bio a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.social-links {
  display: flex;
  gap: 20px;
  margin-top: 24px;
}

.social-links a {
  color: var(--fg-dim);
  font-size: 14px;
  transition: color var(--transition);
  display: flex;
  align-items: center;
  gap: 6px;
}

.social-links a:hover {
  color: var(--fg);
}

.social-links a svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

/* Sections */
section {
  margin-bottom: 72px;
}

.section-header {
  font-size: 14px;
  font-weight: 600;
  color: var(--fg-dim);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 32px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

/* Research / Project cards */
.research-list {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.research-item {
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: 8px;
  transition: border-color var(--transition), background-color var(--transition);
}

.research-item:hover {
  border-color: #3f3f46;
  background-color: var(--bg-secondary);
}

.research-item-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.research-item h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--fg);
}

.status-badge {
  font-size: 12px;
  padding: 3px 10px;
  border-radius: 12px;
  font-weight: 500;
  white-space: nowrap;
  flex-shrink: 0;
}

.status-badge.active {
  background: rgba(74, 222, 128, 0.1);
  color: var(--green);
  border: 1px solid rgba(74, 222, 128, 0.3);
}

.status-badge.done {
  background: rgba(250, 204, 21, 0.1);
  color: var(--yellow);
  border: 1px solid rgba(250, 204, 21, 0.3);
}

.key-finding {
  margin-top: 12px;
  padding: 12px 16px;
  background: rgba(74, 222, 128, 0.05);
  border-left: 3px solid var(--green);
  border-radius: 0 6px 6px 0;
  font-size: 13px;
  font-family: var(--font-mono);
  color: var(--green);
  line-height: 1.6;
}

.research-item h3 a {
  color: var(--fg);
}

.research-item h3 a:hover {
  color: var(--accent);
}

.research-meta {
  font-size: 13px;
  color: var(--fg-dim);
  margin-bottom: 10px;
}

.research-item p {
  font-size: 14px;
  color: var(--fg-muted);
  line-height: 1.7;
}

.research-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 12px;
}

.tag {
  font-size: 12px;
  padding: 3px 10px;
  border-radius: 4px;
  background: var(--bg-secondary);
  color: var(--fg-dim);
  border: 1px solid var(--border);
}

.research-links {
  display: flex;
  gap: 12px;
  margin-top: 12px;
}

.research-links a {
  font-size: 12px;
  color: var(--accent);
  padding: 2px 8px;
  border: 1px solid var(--accent);
  border-radius: 4px;
  transition: all var(--transition);
}

.research-links a:hover {
  background: var(--accent);
  color: var(--bg);
}

/* Blog list */
.blog-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.blog-item {
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 20px;
  transition: opacity var(--transition);
}

.blog-item:first-child {
  padding-top: 0;
}

.blog-item:hover {
  opacity: 0.8;
}

.blog-item h3 {
  font-size: 15px;
  font-weight: 500;
  color: var(--fg);
}

.blog-item h3 a {
  color: var(--fg);
}

.blog-item h3 a:hover {
  color: var(--accent);
}

.blog-date {
  font-size: 13px;
  color: var(--fg-dim);
  white-space: nowrap;
  flex-shrink: 0;
}

.blog-item p {
  font-size: 13px;
  color: var(--fg-muted);
  margin-top: 4px;
}

/* Footer */
footer {
  padding: 48px 0;
  margin-top: 40px;
  border-top: 1px solid var(--border);
}

footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

footer p {
  font-size: 13px;
  color: var(--fg-dim);
}

footer a {
  color: var(--fg-dim);
}

footer a:hover {
  color: var(--fg);
}

/* Blog post page */
.post-header {
  margin-bottom: 48px;
}

.post-header h1 {
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 12px;
}

.post-meta {
  font-size: 13px;
  color: var(--fg-dim);
}

.post-content {
  font-size: 15px;
  line-height: 1.85;
  color: var(--fg-muted);
}

.post-content h2 {
  font-size: 20px;
  font-weight: 600;
  color: var(--fg);
  margin: 40px 0 16px;
}

.post-content h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--fg);
  margin: 32px 0 12px;
}

.post-content p {
  margin-bottom: 20px;
}

.post-content code {
  background: var(--bg-secondary);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 14px;
  border: 1px solid var(--border);
}

.post-content pre {
  background: var(--bg-secondary);
  padding: 20px;
  border-radius: 8px;
  overflow-x: auto;
  margin: 24px 0;
  border: 1px solid var(--border);
}

.post-content pre code {
  background: none;
  padding: 0;
  border: none;
  font-size: 14px;
}

.post-content ul, .post-content ol {
  margin: 16px 0;
  padding-left: 24px;
}

.post-content li {
  margin-bottom: 8px;
}

.post-content blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 16px;
  margin: 24px 0;
  color: var(--fg-dim);
  font-style: italic;
}

.post-content a {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.back-link {
  display: inline-block;
  margin-bottom: 32px;
  font-size: 14px;
  color: var(--fg-dim);
}

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

/* Responsive */
@media (max-width: 640px) {
  nav {
    padding: 24px 0 0;
    margin-bottom: 48px;
  }

  .mobile-toggle {
    display: block;
  }

  .nav-links {
    display: none;
    flex-direction: column;
    gap: 16px;
    position: absolute;
    top: 64px;
    right: 24px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px 24px;
    z-index: 100;
  }

  .nav-links.open {
    display: flex;
  }

  nav .container {
    position: relative;
  }

  .hero h1 {
    font-size: 22px;
  }

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

  footer .container {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}