:root {
  --primary-color: #19ff83;
  /* BIO-ISAC Bright Green */
  --secondary-color: #004d4f;
  /* Slightly lighter teal */
  --accent-color: #ffffff;
  /* White */
  --bg-dark: #003033;
  /* BIO-ISAC Dark Teal */
  --bg-card: rgba(255, 255, 255, 0.05);
  --text-main: #e0e0e0;
  --text-muted: #b0caca;
  --font-main: 'Inter', system-ui, -apple-system, sans-serif;
}

.logo-box {
  background: white;
  padding: 10px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100px;
  width: 100%;
}

.logo-box img {
  max-height: 80px;
  max-width: 100%;
  object-fit: contain;
}

.logo-box {
  background: white;
  padding: 10px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

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

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  color: #fff;
  margin-bottom: 1rem;
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color 0.3s ease;
}

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

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.8rem 1.6rem;
  border-radius: 50px;
  background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
  color: #fff;
  font-weight: 600;
  cursor: pointer;
  border: none;
  box-shadow: 0 4px 15px rgba(0, 210, 255, 0.3);
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 210, 255, 0.5);
  color: #fff;
}

/* Layout */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* Header & Nav */
header {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(10, 10, 18, 0.8);
  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;
  height: 80px;
}

.logo span {
  font-size: 1.5rem;
  font-weight: 800;
  background: linear-gradient(to right, var(--primary-color), var(--accent-color));
  -webkit-background-clip: text;
  color: transparent;
}

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

.nav-links a {
  color: var(--text-main);
  font-weight: 500;
  font-size: 1rem;
}

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

/* Hero Section */
.hero {
  height: 90vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding-top: 80px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at 50% 50%, rgba(157, 0, 255, 0.15) 0%, rgba(10, 10, 18, 0) 70%);
  z-index: -1;
}

.hero h1 {
  font-size: 4rem;
  letter-spacing: -2px;
  margin-bottom: 0.5rem;
  background: linear-gradient(135deg, #fff 0%, var(--primary-color) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: 1.5rem;
  color: var(--text-muted);
  max-width: 800px;
  margin: 0 auto 2rem;
}

/* Sections */
.section {
  padding: 5rem 0;
}

.bg-darker {
  background: #050509;
}

.card {
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 2rem;
  border-radius: 12px;
  backdrop-filter: blur(5px);
  transition: transform 0.3s;
}

.card:hover {
  transform: translateY(-5px);
  border-color: var(--primary-color);
}

/* Logos & Grid */
.organizers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 2rem;
  align-items: center;
  justify-items: center;
  margin-top: 2rem;
}

.organizers-grid img {
  max-width: 100%;
  max-height: 80px;
  filter: grayscale(100%);
  opacity: 0.7;
  transition: all 0.3s;
}

.organizers-grid img:hover {
  filter: grayscale(0%);
  opacity: 1;
}

/* Footer */
footer {
  text-align: center;
  padding: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  margin-top: auto;
  color: var(--text-muted);
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.5rem;
  }

  .nav-links {
    display: none;
    /* simple mobile hide for now, could enhance later */
  }
}