/* Lumeg - Intelligent Light & Sound */
:root {
    /* Color Palette - Light Mode (Default) */
    --bg-main: #F7F8FA;
    --bg-alt: #FAFAF8;
    --accent-primary: #5BC0BE;
    /* Lumeg Teal */
    --accent-secondary: #4A6FFF;
    /* Intelligence Blue */
    --accent-warm: #E6D8B5;
    /* Human Warmth */
    --text-primary: #1A1D21;
    --text-secondary: #6B7280;
    --divider: #E5E7EB;

    /* Gradients */
    --gradient-lumeg: linear-gradient(135deg, #5BC0BE 0%, #4A6FFF 50%, #E6D8B5 100%);
    --gradient-glow: radial-gradient(circle at center, rgba(91, 192, 190, 0.15) 0%, rgba(247, 248, 250, 0) 70%);

    /* Fonts */
    --font-heading: 'Satoshi', 'Inter', 'Neue Haas Grotesk', sans-serif;
    --font-body: 'Inter', sans-serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;

    /* Transitions */
    --transition-smooth: all 0.4s cubic-bezier(0.25, 1, 0.5, 1);
}

[data-theme="dark"] {
    --bg-main: #0E1116;
    --bg-alt: #16191F;
    --text-primary: #E5E7EB;
    --text-secondary: #9CA3AF;
    --divider: #1F2937;
    --gradient-glow: radial-gradient(circle at center, rgba(91, 192, 190, 0.10) 0%, rgba(14, 17, 22, 0) 70%);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.6;
    font-weight: 300;
    /* Light weight for body */
    transition: background-color 0.3s ease, color 0.3s ease;
    overflow-x: hidden;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    font-weight: 400;
    /* Avoid heavy bold */
    line-height: 1.2;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

h1 {
    font-size: 3.5rem;
}

h2 {
    font-size: 2.5rem;
}

h3 {
    font-size: 1.75rem;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition-smooth);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Utility Classes */
.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

.text-gradient {
    background: var(--gradient-lumeg);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.btn {
    display: inline-block;
    padding: 1rem 2rem;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    transition: var(--transition-smooth);
    cursor: pointer;
    border: 1px solid transparent;
}

.btn-primary {
    background: var(--gradient-lumeg);
    color: #fff;
    box-shadow: 0 4px 15px rgba(91, 192, 190, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(91, 192, 190, 0.4);
}

.btn-secondary {
    background: transparent;
    border: 1px solid var(--accent-primary);
    color: var(--accent-primary);
}

.btn-secondary:hover {
    background: var(--accent-primary);
    color: #fff;
}

/* Section Styling */
section {
    padding: var(--spacing-xl) 0;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    padding: 1.5rem 0;
    background: rgba(247, 248, 250, 0.8);
    /* Glassmorphism */
    backdrop-filter: blur(10px);
    transition: var(--transition-smooth);
    border-bottom: 1px solid transparent;
}

[data-theme="dark"] .navbar {
    background: rgba(14, 17, 22, 0.8);
}

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

.logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.nav-link {
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-weight: 400;
}

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

/* Mobile Menu */
.hamburger {
    display: none;
    cursor: pointer;
    flex-direction: column;
    gap: 6px;
}

.bar {
    width: 25px;
    height: 2px;
    background-color: var(--text-primary);
    transition: var(--transition-smooth);
}

/* Dark Mode Toggle */
.theme-toggle {
    cursor: pointer;
    padding: 0.5rem;
    color: var(--text-secondary);
    transition: var(--transition-smooth);
}

.theme-toggle:hover {
    color: var(--accent-primary);
}

/* Responsive Grid Utilities */
.grid-responsive {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 4rem;
    align-items: center;
}

.grid-2-cols {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    h1 {
        font-size: 2.5rem;
    }

    h2 {
        font-size: 2rem;
    }

    .hamburger {
        display: flex;
        margin-left: auto;
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        height: 100vh;
        width: 70%;
        background: var(--bg-alt);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        transition: var(--transition-smooth);
        box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
    }

    .nav-links.active {
        right: 0;
    }

    section {
        padding: var(--spacing-lg) 0;
    }

    .grid-responsive,
    .grid-2-cols {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}