:root {
    /* Colors */
    --color-primary: #1A202C; /* Dark "nebula" for text/elements */
    --color-secondary: #6C63FF; /* Vibrant accent for highlights */
    --color-background-main: #F0F2F5; /* Light background for main content */
    --color-footer-bg: #121212; /* Dark footer */
    --color-button: #4A90E2; /* Primary button color */
    --color-text-light: #f0f2f5; /* For dark backgrounds */
    --color-text-dark: #1A202C; /* For light backgrounds */
    --color-section-bg-1: #FFFFFF;
    --color-section-bg-2: #F8FBFD;
    --color-section-bg-3: #E2EEF7;
    --color-section-bg-4: #D9EBF8;
    --color-section-bg-5: #C5E0F4;

    /* Typography */
    --font-heading: 'Montserrat', sans-serif;
    --font-body: 'Lato', sans-serif;
    --font-size-base: 1rem; /* 16px */
    --line-height-base: 1.7;
    --line-height-heading: 1.2;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    /* Border Radius */
    --border-radius-sm: 0.25rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 1rem;

    /* Transitions */
    --transition-speed: 0.3s;
    --transition-timing-function: ease-in-out;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1), 0 2px 4px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1), 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-interactive: 0 8px 15px rgba(108, 99, 255, 0.3); /* Subtle glow for interactive elements */
}

/* Base Styles */
html {
    scroll-behavior: smooth;
    box-sizing: border-box;
}

*, *::before, *::after {
    box-sizing: inherit;
}

body {
    font-family: var(--font-body);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--color-text-dark);
    background-color: var(--color-background-main);
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden; /* Prevent horizontal scroll due to animations */
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    line-height: var(--line-height-heading);
    color: var(--color-primary);
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em; /* Slight letter spacing for modern feel */
}

h1 {
    font-size: 3.5rem; /* 56px */
    font-weight: 700;
}

h2 {
    font-size: 2.5rem; /* 40px */
    font-weight: 600;
}

h3 {
    font-size: 1.75rem; /* 28px */
    font-weight: 600;
}

h4 {
    font-size: 1.5rem; /* 24px */
    font-weight: 500;
}

p {
    margin-bottom: var(--spacing-sm);
    color: rgba(26, 32, 44, 0.85); /* Slightly lighter than primary for readability */
}

a {
    color: var(--color-secondary);
    text-decoration: none;
    transition: color var(--transition-speed) var(--transition-timing-function);
}

a:hover {
    color: var(--color-primary);
    text-decoration: underline;
}

/* Utility Classes for Layout and Spacing (complementing Tailwind) */
.container {
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--spacing-sm);
    padding-right: var(--spacing-sm);
}

.section-padding {
    padding-top: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
}

/* Section Backgrounds */
.section-bg-1 {
    background-color: var(--color-section-bg-1);
}

.section-bg-2 {
    background-color: var(--color-section-bg-2);
}

.section-bg-3 {
    background-color: var(--color-section-bg-3);
}

.section-bg-4 {
    background-color: var(--color-section-bg-4);
}

.section-bg-5 {
    background-color: var(--color-section-bg-5);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.85rem 1.75rem;
    border-radius: var(--border-radius-md); /* Rounded rectangular */
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: var(--font-size-base);
    cursor: pointer;
    border: none;
    outline: none;
    position: relative;
    overflow: hidden;
    transform: translateZ(0); /* For smooth GPU acceleration */
    transition: all var(--transition-speed) var(--transition-timing-function);
    box-shadow: var(--shadow-sm);
}

.btn-primary {
    background-color: var(--color-button);
    color: var(--color-text-light);
    background-image: linear-gradient(45deg, var(--color-button) 0%, #6C63FF 100%); /* Subtle gradient */
}

.btn-primary:hover {
    transform: translateY(-3px); /* Subtle lift */
    box-shadow: var(--shadow-interactive); /* Glowing shadow */
    background-image: linear-gradient(45deg, #6C63FF 0%, var(--color-button) 100%); /* Shift gradient */
}

.btn-secondary {
    background-color: transparent;
    border: 2px solid var(--color-secondary);
    color: var(--color-secondary);
    padding: 0.75rem 1.65rem; /* Adjust padding for border */
}

.btn-secondary:hover {
    background-color: var(--color-secondary);
    color: var(--color-text-light);
    transform: translateY(-3px);
    box-shadow: var(--shadow-interactive);
}

/* "Squishy" button effect (can be applied via JS or complex CSS, simplified here) */
.btn:active {
    transform: scale(0.98); /* Slightly squish */
    box-shadow: none;
}


/* Header Styles */
.header {
    background-color: var(--color-primary); /* Dark 'nebula' background */
    background-image: radial-gradient(circle at top left, rgba(108, 99, 255, 0.2) 0%, transparent 50%),
                      radial-gradient(circle at bottom right, rgba(26, 32, 44, 0.8) 0%, transparent 70%);
    color: var(--color-text-light);
    padding: var(--spacing-sm) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-md);
    transition: background-color var(--transition-speed) var(--transition-timing-function),
                box-shadow var(--transition-speed) var(--transition-timing-function);
}

.header.scrolled {
    background-color: rgba(26, 32, 44, 0.95); /* Slightly darker/more opaque when scrolled */
    box-shadow: var(--shadow-lg);
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.75rem;
    color: var(--color-text-light);
    letter-spacing: -0.03em;
    position: relative;
    text-shadow: 0 0 5px rgba(108, 99, 255, 0.5); /* Subtle glow */
}

.nav-links a {
    color: var(--color-text-light);
    margin-left: var(--spacing-md);
    font-weight: 500;
    position: relative;
    padding-bottom: 5px; /* Space for underline effect */
}

.nav-links a::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-secondary);
    transition: width var(--transition-speed) var(--transition-timing-function);
}

.nav-links a:hover::after {
    width: 100%;
}

/* Mobile Navigation (Example - would need JS to toggle) */
.mobile-nav-toggle {
    display: none; /* Hidden by default */
    background: none;
    border: none;
    color: var(--color-text-light);
    font-size: 2rem;
    cursor: pointer;
    z-index: 1001;
}

.mobile-nav-menu {
    display: none; /* Hidden by default */
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(26, 32, 44, 0.98);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transform: translateX(100%);
    transition: transform 0.4s ease-out;
    z-index: 999;
}

.mobile-nav-menu.open {
    transform: translateX(0);
}

.mobile-nav-menu a {
    color: var(--color-text-light);
    font-size: 1.8rem;
    padding: var(--spacing-sm);
    display: block;
    margin-bottom: var(--spacing-sm);
    transition: color 0.2s ease;
}

.mobile-nav-menu a:hover {
    color: var(--color-secondary);
}

/* Cards (Example) */
.card {
    background-color: var(--color-section-bg-1);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-speed) var(--transition-timing-function),
                box-shadow var(--transition-speed) var(--transition-timing-function);
    display: flex;
    flex-direction: column;
    align-items: flex-start; /* Align content to the left */
    overflow: hidden; /* Ensure background patterns don't overflow */
    position: relative;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

/* Abstract Digital Programming Backgrounds (for hero sections) */
.hero-section {
    background-color: var(--color-primary);
    color: var(--color-text-light);
    position: relative;
    overflow: hidden;
    padding: var(--spacing-xl) 0;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('data:image/svg+xml;utf8,<svg width="100%" height="100%" viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 L 0 10" fill="none" stroke="%232c3e50" stroke-width="0.2"/></pattern></defs><rect width="100%" height="100%" fill="url(%23grid)" /></svg>');
    background-size: 20px 20px;
    opacity: 0.15;
    z-index: 1;
    animation: backgroundPan 60s linear infinite; /* Subtle slow pan */
}

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

@keyframes backgroundPan {
    from {
        background-position: 0 0;
    }
    to {
        background-position: 2000px 2000px;
    }
}

/* Icon Set Styles (SVG line icons with fill animations) */
.icon-wrapper {
    display: inline-block;
    width: 60px; /* Example size */
    height: 60px;
    margin-bottom: var(--spacing-sm);
    transition: transform var(--transition-speed) var(--transition-timing-function);
}

.icon-wrapper svg {
    width: 100%;
    height: 100%;
    stroke: var(--color-primary); /* Default line color */
    stroke-width: 2;
    fill: none; /* Initially no fill */
    transition: all var(--transition-speed) var(--transition-timing-function);
}

.icon-wrapper:hover svg {
    stroke: var(--color-secondary); /* Line color on hover */
    fill: rgba(108, 99, 255, 0.1); /* Subtle fill on hover */
    transform: scale(1.05); /* Slight scale */
}

/* Footer */
.footer {
    background-color: var(--color-footer-bg);
    color: var(--color-text-light);
    padding: var(--spacing-lg) 0;
    text-align: center;
}

.footer a {
    color: var(--color-secondary);
}

.footer a:hover {
    color: var(--color-text-light);
}

/* Media Queries for Responsiveness */
@media (max-width: 1024px) {
    h1 {
        font-size: 3rem;
    }
    h2 {
        font-size: 2rem;
    }
    .nav-links {
        display: none; /* Hide desktop nav */
    }
    .mobile-nav-toggle {
        display: block; /* Show mobile toggle */
    }
}

@media (max-width: 768px) {
    h1 {
        font-size: 2.5rem;
    }
    h2 {
        font-size: 1.75rem;
    }
    .section-padding {
        padding-top: var(--spacing-md);
        padding-bottom: var(--spacing-md);
    }
    .hero-section {
        padding: var(--spacing-lg) 0;
    }
    .btn {
        padding: 0.75rem 1.5rem;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 2rem;
    }
    h2 {
        font-size: 1.5rem;
    }
    .container {
        padding-left: var(--spacing-xs);
        padding-right: var(--spacing-xs);
    }
    .btn {
        width: 100%; /* Full width buttons on small screens */
        margin-bottom: var(--spacing-sm);
    }
}

/* AOS (Animate On Scroll) Integration - Example */
/* AOS will add classes like 'aos-animate' to elements */
[data-aos] {
    transition-property: transform, opacity;
}

[data-aos="fade-up"] {
    transform: translateY(20px);
    opacity: 0;
}

[data-aos="fade-up"].aos-animate {
    transform: translateY(0);
    opacity: 1;
}

[data-aos="slide-right"] {
    transform: translateX(-50px);
    opacity: 0;
}

[data-aos="slide-right"].aos-animate {
    transform: translateX(0);
    opacity: 1;
}

[data-aos="zoom-in"] {
    transform: scale(0.9);
    opacity: 0;
}

[data-aos="zoom-in"].aos-animate {
    transform: scale(1);
    opacity: 1;
}


/* Cookie Banner Additional Styles for Tailwind */
.cookie-banner-hover-effect:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

@media (prefers-reduced-motion: reduce) {
    .cookie-banner-hover-effect:hover {
        transform: none;
    }
}