:root {
    --bg-color: #050505;
    --text-primary: #f0f0f0;
    --text-secondary: #a0a0a0;

    /* Bio-stain Colors */
    --dapi-blue: #0066ff;
    --fitc-green: #00ff66;
    --cy5-magenta: #ff00ff;
    --tritc-red: #ff3300;

    /* Glassmorphism */
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-blur: blur(12px);

    --font-main: 'Inter', system-ui, -apple-system, sans-serif;
    --font-heading: 'Outfit', sans-serif;
}

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

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

h1,
h2,
h3 {
    font-family: var(--font-heading);
    font-weight: 700;
    letter-spacing: -0.02em;
}

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

section {
    padding: 6rem 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

/* Hero Section */
.hero {
    text-align: center;
    background: radial-gradient(circle at 50% 50%, rgba(0, 102, 255, 0.1) 0%, transparent 70%);
}

.hero h1 {
    font-size: clamp(2.5rem, 6vw, 5rem);
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, #fff 30%, var(--dapi-blue) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subheadings {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.subheading {
    font-size: 1.1rem;
    font-weight: 600;
    padding: 0.6rem 1.8rem;
    border-radius: 99px;
    border: 1px solid var(--glass-border);
    background: rgba(255, 255, 255, 0.1);
    /* Brighter default */
    backdrop-filter: var(--glass-blur);
    transition: all 0.3s ease;
    cursor: pointer;
    color: #fff;
    /* Ensure white text */
}

.subheading:hover {
    transform: translateY(-5px);
    border-color: var(--fitc-green);
    background: rgba(0, 255, 102, 0.15);
    box-shadow: 0 0 25px rgba(0, 255, 102, 0.3);
}

.subheading.active {
    background: var(--fitc-green) !important;
    color: #000 !important;
    border-color: transparent;
    opacity: 1 !important;
}

/* Glass Card */
.glass-card {
    background: rgba(255, 255, 255, 0.07);
    border: 1px solid rgba(255, 255, 255, 0.15);
    backdrop-filter: var(--glass-blur);
    border-radius: 24px;
    padding: 2.5rem;
}

/* Navigation */
nav {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 100;
    padding: 1.5rem 0;
    background: rgba(5, 5, 5, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--glass-border);
}

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

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

nav a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: color 0.3s ease;
}

nav a:hover {
    color: var(--fitc-green);
}

/* Transitions */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeIn 0.8s forwards;
}

@keyframes fadeIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}