:root {
  --bg-dark: #0a0e17;
  --bg-card: #151b29;
  --bg-card-hover: #1e2638;
  --text-main: #e2e8f0;
  --text-muted: #94a3b8;
  --accent-green: #10b981;
  --accent-blue: #3b82f6;
  --accent-purple: #8b5cf6;
  
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'Fira Code', 'Courier New', monospace;
  
  --transition: all 0.3s ease;
  --border-radius: 8px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px; /* Offset for fixed header */
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.6;
}

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

a:hover {
  color: var(--text-main);
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-mono);
  font-weight: 600;
  margin-bottom: 1rem;
}

h2 {
  font-size: 2.5rem;
  color: var(--accent-green);
  display: flex;
  align-items: center;
}

h2::before {
  content: "root@bilkentcss:~$ ";
  color: var(--accent-blue);
  font-size: 1.5rem;
  margin-right: 10px;
}

/* Layout */
.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 4rem 0;
}

/* Header & Nav */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: rgba(10, 14, 23, 0.9);
  backdrop-filter: blur(10px);
  z-index: 1000;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 5%;
  max-width: 1200px;
  margin: 0 auto;
}

.logo {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-main);
  text-transform: uppercase;
  letter-spacing: 2px;
}

.logo span {
  color: var(--accent-green);
}

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

.nav-links a {
  color: var(--text-main);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  text-transform: uppercase;
}

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

.hamburger {
  display: none;
  cursor: pointer;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 1.5rem;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.8rem 1.5rem;
  background-color: transparent;
  border: 1px solid var(--accent-green);
  color: var(--accent-green);
  font-family: var(--font-mono);
  border-radius: 4px;
  cursor: pointer;
  transition: var(--transition);
  text-transform: uppercase;
  font-size: 0.9rem;
}

.btn:hover {
  background-color: var(--accent-green);
  color: var(--bg-dark);
}

.btn-primary {
  background-color: var(--accent-green);
  color: var(--bg-dark);
}

.btn-primary:hover {
  background-color: transparent;
  color: var(--accent-green);
}

/* Hero Section */
#hero {
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 0 1rem;
  background: radial-gradient(circle at center, #1a2436 0%, #0a0e17 100%);
  position: relative;
}

#hero h1 {
  font-size: 4rem;
  margin-bottom: 1rem;
  text-shadow: 0 0 20px rgba(16, 185, 129, 0.3);
}

#hero h1 span {
  color: var(--accent-green);
}

#hero p {
  font-size: 1.2rem;
  color: var(--text-muted);
  max-width: 600px;
  margin-bottom: 2rem;
  font-family: var(--font-mono);
}

.scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  animation: bounce 2s infinite;
}

.scroll-indicator a {
  color: var(--text-muted);
  font-size: 2rem;
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateY(0) translateX(-50%); }
  40% { transform: translateY(-20px) translateX(-50%); }
  60% { transform: translateY(-10px) translateX(-50%); }
}

/* Grids */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}

/* Cards */
.card {
  background-color: var(--bg-card);
  border-radius: var(--border-radius);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.05);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-5px);
  border-color: var(--accent-green);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.card-content {
  padding: 1.5rem;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.card-title {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
  color: var(--text-main);
}

.card-meta {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-blue);
  margin-bottom: 1rem;
}

.card-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.tag {
  background-color: rgba(16, 185, 129, 0.1);
  color: var(--accent-green);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-family: var(--font-mono);
}

/* Team Grid specific */
.team-grid {
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
}

.team-card {
  text-align: center;
  padding: 2rem;
}

.team-photo {
  width: 140px;
  height: 160px;
  object-fit: cover;
  border-radius: 12px;
  margin: 0 auto 1rem;
  border: 3px solid var(--accent-purple);
  padding: 3px;
}

.team-role {
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

/* Sponsors Slider */
.sponsors-slider {
  overflow: hidden;
  position: relative;
  width: 100%;
  padding: 1rem 0;
}

.sponsors-slider::before,
.sponsors-slider::after {
  content: "";
  position: absolute;
  top: 0;
  width: 150px;
  height: 100%;
  z-index: 2;
}

.sponsors-slider::before {
  left: 0;
  background: linear-gradient(to right, var(--bg-dark) 0%, transparent 100%);
}

.sponsors-slider::after {
  right: 0;
  background: linear-gradient(to left, var(--bg-dark) 0%, transparent 100%);
}

.sponsors-track {
  display: flex;
  width: max-content;
  align-items: center;
  animation: scrollSponsors 20s linear infinite;
}

.sponsors-track:hover {
  animation-play-state: paused;
}

@keyframes scrollSponsors {
  0% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(-50%);
  }
}

.sponsor-logo {
  display: inline-block;
  vertical-align: middle;
  margin: 0 2rem;
  filter: grayscale(100%) opacity(0.7);
  transition: var(--transition);
  max-height: 80px;
}

.sponsor-logo:hover {
  filter: grayscale(0%) opacity(1);
}

/* About Section */
.about-stats {
  display: flex;
  justify-content: space-around;
  margin-top: 3rem;
  flex-wrap: wrap;
  gap: 2rem;
}

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

.stat-num {
  font-size: 3rem;
  font-family: var(--font-mono);
  color: var(--accent-green);
  font-weight: 700;
}

.stat-label {
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* Footer */
footer {
  background-color: #05070a;
  padding: 2rem 5%;
  text-align: center;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.social-buttons {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.social-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.8rem;
  padding: 1rem 2rem;
  border-radius: var(--border-radius);
  background-color: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.05);
  color: var(--text-main);
  font-family: var(--font-mono);
  font-size: 1.1rem;
  transition: var(--transition);
  text-decoration: none;
}

.social-btn svg {
  width: 24px;
  height: 24px;
  transition: var(--transition);
}

.social-btn:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0,0,0,0.2);
}

.social-btn.linkedin:hover { border-color: #0077b5; color: #0077b5; }
.social-btn.instagram:hover { border-color: #e1306c; color: #e1306c; }
.social-btn.youtube:hover { border-color: #ff0000; color: #ff0000; }
.social-btn.email:hover { border-color: var(--accent-green); color: var(--accent-green); }

.footer-text {
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

/* Section Header Buttons */
.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

/* Utility classes */
.text-center { text-align: center; }
.mt-4 { margin-top: 2rem; }

/* Markdown Content Styling for Writeup Details */
.markdown-content {
  background-color: var(--bg-card);
  padding: 2rem;
  border-radius: var(--border-radius);
  border: 1px solid rgba(255,255,255,0.05);
}

.markdown-content h1, 
.markdown-content h2, 
.markdown-content h3 {
  margin-top: 2rem;
  margin-bottom: 1rem;
}

.markdown-content h2::before {
  content: ">> ";
  font-size: inherit;
}

.markdown-content p {
  margin-bottom: 1rem;
  color: var(--text-muted);
}

.markdown-content pre {
  background-color: #05070a;
  padding: 1rem;
  border-radius: 4px;
  overflow-x: auto;
  margin: 1.5rem 0;
  border: 1px solid rgba(255,255,255,0.1);
}

.markdown-content code {
  font-family: var(--font-mono);
  color: var(--accent-green);
}

.markdown-content ul, 
.markdown-content ol {
  margin-bottom: 1rem;
  padding-left: 2rem;
  color: var(--text-muted);
}

.markdown-content blockquote {
  border-left: 4px solid var(--accent-purple);
  padding-left: 1rem;
  margin: 1.5rem 0;
  font-style: italic;
  background-color: rgba(139, 92, 246, 0.1);
  padding: 1rem;
  border-radius: 0 4px 4px 0;
}

/* Responsive */
@media (max-width: 768px) {
  .hamburger {
    display: block;
  }
  
  .nav-links {
    position: fixed;
    top: 70px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 70px);
    background-color: var(--bg-dark);
    flex-direction: column;
    align-items: center;
    padding-top: 2rem;
    transition: var(--transition);
  }
  
  .nav-links.active {
    left: 0;
  }
  
  #hero h1 {
    font-size: 2.5rem;
  }
  
  h2 {
    font-size: 1.8rem;
  }
  
  h2::before {
    font-size: 1.2rem;
  }
  
  .section-header {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* Modal & Carousel */
.modal {
  display: none;
  position: fixed;
  z-index: 2000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(5px);
  align-items: center;
  justify-content: center;
}

.modal.active {
  display: flex;
}

.modal-content {
  background-color: var(--bg-card);
  border: 1px solid var(--accent-green);
  border-radius: var(--border-radius);
  width: 90%;
  max-width: 700px;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  padding: 2rem;
  box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

.close-btn {
  position: absolute;
  top: 1rem;
  right: 1.5rem;
  color: var(--text-muted);
  font-size: 2rem;
  font-weight: bold;
  cursor: pointer;
  transition: var(--transition);
  z-index: 10;
}

.close-btn:hover {
  color: var(--accent-green);
}

.carousel {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  background-color: rgba(0, 0, 0, 0.5);
  border-radius: var(--border-radius);
  margin-top: 1.5rem;
  margin-bottom: 1.5rem;
  overflow: hidden;
}

.carousel img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: none;
}

.carousel img.active {
  display: block;
}

.carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background-color: rgba(0,0,0,0.5);
  color: white;
  border: none;
  font-size: 1.5rem;
  padding: 0.5rem 1rem;
  cursor: pointer;
  transition: var(--transition);
  border-radius: 4px;
}

.carousel-btn:hover {
  background-color: var(--accent-green);
}

.carousel-btn.prev {
  left: 10px;
}

.carousel-btn.next {
  right: 10px;
}

.modal-title {
  margin-bottom: 0.5rem;
  color: var(--accent-green);
}

.modal-title::before {
  content: none;
}

.modal-meta {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--accent-blue);
  margin-bottom: 1.5rem;
}

.modal-desc {
  color: var(--text-main);
  margin-bottom: 2rem;
  white-space: pre-line;
}

.modal-buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}