:root {
    --bg-dark: #0f172a; /* Slate 900 */
    --text-primary: #f8fafc; /* Slate 50 */
    --text-secondary: #94a3b8; /* Slate 400 */
    --accent-primary: #38bdf8; /* Sky 400 */
    --accent-secondary: #818cf8; /* Indigo 400 */
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --scroll: 0; /* Updated by JS */
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Background Animation */
.background-glob {
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(
        circle at 50% 50%, 
        rgba(56, 189, 248, 0.15) 0%, 
        rgba(129, 140, 248, 0.05) 30%, 
        rgba(15, 23, 42, 0) 70%
    );
    z-index: -1;
    /* Rotate and shift based on scroll variable */
    transform: rotate(calc(var(--scroll) * 360deg)) scale(calc(1 + var(--scroll) * 0.2));
    transition: transform 0.1s linear; /* Smooth but responsive */
    pointer-events: none;
}

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

h1, h2, h3 {
    font-weight: 800;
    letter-spacing: -0.02em;
}

h1 {
    font-size: clamp(3rem, 8vw, 6rem);
    line-height: 1.1;
    margin-bottom: 1.5rem;
}

h2 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    text-align: center;
}

p {
    color: var(--text-secondary);
    font-size: 1.125rem;
}

/* Text Gradient */
.text-gradient {
    background: linear-gradient(to right, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-size: 200% auto;
    animation: shine 5s linear infinite;
}

@keyframes shine {
    to { background-position: 200% center; }
}

/* Sections */
section {
    padding: 6rem 0;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

section.visible {
    opacity: 1;
    transform: translateY(0);
}

.hero {
    min-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding-top: 0;
}

.hero .subtitle {
    font-size: 1.5rem;
    max-width: 600px;
    margin: 0 auto;
}

/* Features Grid */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

/* Glassmorphism Cards */
.card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(12px);
    padding: 2.5rem;
    border-radius: 1rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    cursor: default;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px -5px rgba(0, 0, 0, 0.3);
    border-color: rgba(56, 189, 248, 0.3);
}

.card h3 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

/* Scroll Content */
.text-block p {
    margin-bottom: 1.5rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

/* Contact */
.contact {
    text-align: center;
}

.btn-primary {
    display: inline-block;
    margin-top: 2rem;
    background: var(--text-primary);
    color: var(--bg-dark);
    padding: 1rem 2rem;
    border-radius: 2rem;
    text-decoration: none;
    font-weight: 600;
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn-primary:hover {
    transform: scale(1.05);
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.3);
}

/* Footer */
footer {
    padding: 2rem 0;
    text-align: center;
    border-top: 1px solid var(--glass-border);
    font-size: 0.875rem;
}

/* Animations */
.fade-in {
    opacity: 0;
    animation: fadeIn 1s ease-out forwards;
}

.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}