:root {
    /* Color Palette - Dark Radiology Theme */
    --bg-primary: #050b14; /* Deep, almost black blue */
    --bg-secondary: #0a1525; /* Slightly lighter for cards/sections */
    --bg-tertiary: #132238; /* Borders/Inputs */
    
    --text-primary: #f0f6fc;
    --text-secondary: #8b949e;
    --text-accent: #00f0ff; /* Electric Cyan - X-ray feel */
    
    --primary-color: #00f0ff;
    --primary-hover: #00bcd4;
    --secondary-color: #2f81f7;
    
    --border-color: #30363d;
    --glass-bg: rgba(10, 21, 37, 0.7);
    --glass-border: rgba(0, 240, 255, 0.1);
    
    /* Spacing & Layout */
    --container-width: 1200px;
    --header-height: 80px;
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    
    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

html {
    scroll-behavior: smooth;
}

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

/* Utilities */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

.text-gradient {
    background: linear-gradient(135deg, #fff 0%, var(--primary-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 32px;
    border-radius: 100px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    font-size: 1rem;
    border: none;
}

.btn-primary {
    background: transparent;
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
    box-shadow: 0 0 15px rgba(0, 240, 255, 0.1);
}

.btn-primary:hover {
    background: var(--primary-color);
    color: var(--bg-primary);
    box-shadow: 0 0 30px rgba(0, 240, 255, 0.4);
    transform: translateY(-2px);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

/* Navigation */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background: rgba(5, 11, 20, 0.85); /* transaprent bg-primary */
    backdrop-filter: blur(12px);
    z-index: 1000;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
    letter-spacing: -0.5px;
}

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

nav ul {
    display: flex;
    gap: 40px;
    list-style: none;
}

nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: var(--transition);
}

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

.mobile-toggle {
    display: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding-top: var(--header-height);
    background: 
        radial-gradient(circle at 10% 20%, rgba(0, 240, 255, 0.05) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(47, 129, 247, 0.08) 0%, transparent 40%);
}

.hero-content {
    max-width: 800px;
    position: relative;
    z-index: 2;
}

.hero h1 {
    font-size: 4rem;
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -1.5px;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    max-width: 600px;
}

.hero-buttons {
    display: flex;
    gap: 20px;
}

/* Features Grid */
.features {
    padding: 120px 0;
    background: var(--bg-primary);
}

.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.section-header p {
    color: var(--text-secondary);
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.card {
    background: var(--bg-secondary);
    padding: 40px;
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.03);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.card:hover {
    transform: translateY(-5px);
    border-color: var(--glass-border);
    box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.5);
}

.card-icon {
    width: 60px;
    height: 60px;
    background: rgba(0, 240, 255, 0.1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    font-size: 1.5rem;
    margin-bottom: 24px;
}

.card h3 {
    font-size: 1.25rem;
    margin-bottom: 16px;
}

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

/* CTA Section */
.cta {
    padding: 100px 0;
    text-align: center;
    background: linear-gradient(rgba(5, 11, 20, 0.8), rgba(5, 11, 20, 0.8)),
                url('https://images.unsplash.com/photo-1551076805-e1869033e561?q=80&w=2832&auto=format&fit=crop'); /* Medical tech placeholder bg */
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

/* Footer */
footer {
    background: var(--bg-secondary);
    padding: 80px 0 40px;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 60px;
}

.footer-col h4 {
    color: var(--text-primary);
    margin-bottom: 24px;
    font-size: 1.1rem;
}

.footer-col ul {
    list-style: none;
}

.footer-col ul li {
    margin-bottom: 12px;
}

.footer-col a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

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

.copyright {
    text-align: center;
    padding-top: 40px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .mobile-toggle {
        display: block;
    }
    
    nav ul {
        display: none;
        position: absolute;
        top: var(--header-height);
        left: 0;
        width: 100%;
        background: var(--bg-secondary);
        flex-direction: column;
        padding: 20px;
        gap: 20px;
        border-bottom: 1px solid var(--border-color);
    }
    
    nav ul.active {
        display: flex;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}