:root {
    /* DEFAULT DARK MODE PALETTE */
    --primary-color: #00f2ff; /* Cyan accent */
    --primary-hover: #00d4e0;
    --secondary-color: #adb5bd; 
    --bg-main: #0a0a0a;
    --bg-secondary: #050505;
    
    /* Text Colors */
    --text-main: #ffffff;
    --text-muted: #a0a0a0;
    --heading-color: #ffffff;

    /* Glassmorphism */
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --nav-bg: rgba(10, 10, 10, 0.8);

    /* Form & UI */
    --form-bg: rgba(255, 255, 255, 0.05);
    --form-border: rgba(255, 255, 255, 0.1);
    --form-text: #ffffff;
    --form-placeholder: rgba(255, 255, 255, 0.4);
    
    /* Global Fonts */
    --font-heading: 'Space Grotesk', sans-serif;
    --font-body: 'Inter', sans-serif;
}

/* OPTIMISTIC LIGHT MODE PALETTE */
[data-theme="light"] {
    --primary-color: #2563eb; /* Vibrant Royal Blue */
    --primary-hover: #1d4ed8;
    --secondary-color: #94a3b8; /* Slate 400 for subtle grids */
    --bg-main: #ffffff; /* Clean White */
    --bg-secondary: #f8fafc; /* Slate 50 */
    
    /* Text Colors */
    --text-main: #1e293b; /* Slate 800 */
    --text-muted: #475569; /* Slate 600 */
    --heading-color: #0f172a; /* Slate 900 */

    /* Glassmorphism (Light) */
    --glass-bg: rgba(255, 255, 255, 0.7); /* Frosted white */
    --glass-border: rgba(37, 99, 235, 0.1); /* Subtle blue tint border */
    --nav-bg: rgba(255, 255, 255, 0.85);

    /* Form & UI */
    --form-bg: #f8fafc; /* Slate 50 */
    --form-border: #cbd5e1; /* Slate 300 */
    --form-text: #0f172a;
    --form-placeholder: #94a3b8;
}

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    font-family: var(--font-body);
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Typography Overrides using Variables */
h1, h2, h3, h4, h5, h6,
.h1, .h2, .h3, .h4, .h5, .h6,
.card-title,
.font-heading {
    color: var(--heading-color);
    font-family: var(--font-heading);
}

.text-muted {
    color: var(--text-muted) !important;
}

.section-bg-dark {
    background-color: var(--bg-main);
    transition: background-color 0.3s ease;
}

.section-bg-darker {
    background-color: var(--bg-secondary);
    transition: background-color 0.3s ease;
}

.py-100 {
    padding-top: 100px;
    padding-bottom: 100px;
}

/* Navbar */
.glass-nav {
    background: var(--nav-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--glass-border);
    transition: all 0.3s ease;
}

.navbar-brand {
    font-weight: 700;
    letter-spacing: 1px;
    color: var(--heading-color);
}

.nav-link {
    font-weight: 300;
    letter-spacing: 0.5px;
    position: relative;
    color: var(--text-main);
}

.nav-link:hover, .nav-link:focus {
    color: var(--primary-color);
}

.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 1px;
    bottom: 5px;
    left: 0;
    background-color: var(--primary-color);
    transition: width 0.3s ease;
}

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

/* Toggle Button */
#theme-toggle {
    color: var(--text-main);
    transition: color 0.3s ease;
}
#theme-toggle:hover {
    color: var(--primary-color);
}

/* --- HERO SECTION ADVANCED --- */

/* 1. Tech Grid (Visible mostly in Light Mode) */
.hero-grid {
    position: absolute;
    inset: 0;
    z-index: 0;
    opacity: 0;
    transition: opacity 0.5s ease;
}

[data-theme="light"] .hero-grid {
    opacity: 0.6;
    /* Dot Matrix Pattern */
    background-image: radial-gradient(var(--secondary-color) 1px, transparent 1px);
    background-size: 40px 40px;
    /* Fade out at bottom */
    mask-image: linear-gradient(to bottom, black 50%, transparent 100%);
    -webkit-mask-image: linear-gradient(to bottom, black 50%, transparent 100%);
}

/* 2. Ambient Glow (Pulsing Center) */
.hero-glow {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    /* Adaptive Gradient: Cyan/Dark for Dark Mode, Blue/White for Light Mode */
    background: radial-gradient(circle at 50% 50%, var(--primary-color) 0%, transparent 70%);
    opacity: 0.15; 
    z-index: 0;
    animation: pulse 10s infinite alternate;
}

/* 3. Floating Abstract Shapes */
.hero-shapes {
    position: absolute;
    inset: 0;
    overflow: hidden;
    pointer-events: none;
    z-index: 0;
}

.shape {
    position: absolute;
    border-radius: 50%;
    filter: blur(60px);
    opacity: 0.4;
    animation: float 20s infinite ease-in-out;
}

.shape-1 {
    top: -10%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: var(--primary-color);
    opacity: 0.2;
}

.shape-2 {
    bottom: 10%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: #4f46e5; /* Indigo */
    opacity: 0.2;
    animation-delay: -5s;
    animation-duration: 25s;
}

.shape-3 {
    top: 40%;
    left: 40%;
    width: 300px;
    height: 300px;
    background: var(--primary-color);
    opacity: 0.1;
    animation-delay: -10s;
    animation-duration: 18s;
}

@keyframes pulse {
    0% { transform: scale(1); opacity: 0.1; }
    100% { transform: scale(1.2); opacity: 0.25; }
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    33% { transform: translate(30px, -50px) rotate(10deg); }
    66% { transform: translate(-20px, 20px) rotate(-5deg); }
}

.text-gradient {
    background: linear-gradient(45deg, var(--text-main), var(--primary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Cards & Glassmorphism */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    transition: transform 0.3s ease, box-shadow 0.3s ease, background-color 0.3s ease, border-color 0.3s ease;
}

.glass-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1); /* Neutral shadow */
    border-color: var(--primary-color);
}

[data-theme="light"] .glass-card {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05); /* Softer shadow for light mode */
}
[data-theme="light"] .glass-card:hover {
    box-shadow: 0 10px 30px rgba(37, 99, 235, 0.15); /* Blue tinted shadow hover */
}

.product-card .icon-box {
    transition: transform 0.3s ease;
}

.product-card:hover .icon-box {
    transform: scale(1.1);
}

/* Form Styles */
.form-control {
    background: var(--form-bg);
    border: 1px solid var(--form-border);
    color: var(--form-text);
    border-radius: 8px;
    padding: 12px 15px;
    transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}

.form-control:focus {
    background: var(--form-bg);
    border-color: var(--primary-color);
    color: var(--form-text);
    box-shadow: 0 0 0 0.2rem rgba(0, 242, 255, 0.1); /* Kept subtle */
}
[data-theme="light"] .form-control:focus {
     box-shadow: 0 0 0 0.2rem rgba(37, 99, 235, 0.2);
}

.form-control::placeholder {
    color: var(--form-placeholder);
}

/* Buttons */
.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: #fff; /* White text is safer for accessibility on dark blue/cyan */
}
[data-theme="dark"] .btn-primary {
    color: #000; /* Black text on Cyan for contrast */
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    border-color: var(--primary-hover);
    color: #fff;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.2);
}
[data-theme="dark"] .btn-primary:hover {
    color: #000;
    box-shadow: 0 0 20px rgba(0, 242, 255, 0.4);
}

.btn-outline-primary {
    color: var(--primary-color);
    border-color: var(--primary-color);
}
.btn-outline-primary:hover {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: #fff;
}
[data-theme="dark"] .btn-outline-primary:hover {
    color: #000;
}

.glow-effect {
    box-shadow: 0 0 15px rgba(0, 242, 255, 0.3);
    transition: box-shadow 0.3s ease;
}
[data-theme="light"] .glow-effect {
    box-shadow: 0 4px 15px rgba(37, 99, 235, 0.4);
}

/* List Groups */
.list-group-item {
    color: var(--text-main);
    border-color: var(--glass-border);
}

/* Animations */
.animate-up {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.8s forwards;
}

.delay-100 { animation-delay: 0.1s; }
.delay-200 { animation-delay: 0.2s; }
.delay-300 { animation-delay: 0.3s; }

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

/* Scroll Animations classes */
.reveal-left, .reveal-right, .reveal-bottom {
    opacity: 0;
    transition: all 1s ease;
}

.reveal-left { transform: translateX(-50px); }
.reveal-right { transform: translateX(50px); }
.reveal-bottom { transform: translateY(50px); }

.reveal-active {
    opacity: 1;
    transform: translate(0, 0);
}