/* --- Core Styling, Fluids & Responsive Alignment Grids --- */
:root {
    --bg-color: #050505;
    --text-main: #ffffff;
    --text-muted: #a0a0a0;
    --btn-bg: rgba(255, 255, 255, 0.1);
    --btn-border: rgba(255, 255, 255, 0.2);
    --btn-hover: rgba(255, 255, 255, 0.25);
    --transition-smooth: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
    
    /* Responsive Fluid Padding token - aligns navigation menu edge to main page content */
    --screen-pad: 5vw; 
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body, html {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: 'DM Sans', sans-serif;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* --- Fixed Backdrop Motion Video Loop --- */
.video-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -2;
    background-color: var(--bg-color);
    pointer-events: none;
}

.video-container video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.video-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: linear-gradient(to bottom, rgba(5,5,5,0.4) 0%, rgba(5,5,5,0.96) 100%);
    z-index: -1;
    pointer-events: none;
}

/* --- Navigation Header --- */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 2.5rem var(--screen-pad); /* Mathematically aligns menu edges to grid edges */
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 100;
    background: linear-gradient(to bottom, rgba(5, 5, 5, 0.8), transparent);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

nav {
    display: flex;
    gap: 2.5rem;
}

nav a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: var(--transition-smooth);
    position: relative;
    padding: 0.25rem 0;
}

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

/* --- Premium Let's Talk Button --- */
.btn {
    background-color: var(--btn-bg);
    border: 1px solid var(--btn-border);
    color: var(--text-main);
    padding: 0.65rem 1.6rem;
    border-radius: 8px;
    font-family: 'DM Sans', sans-serif;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: var(--transition-smooth);
    text-decoration: none;
    display: inline-block;
}

.btn:hover {
    background-color: var(--btn-hover);
    border-color: rgba(255, 255, 255, 0.4);
    transform: translateY(-2px);
}

.btn-large {
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
    border-radius: 10px;
}

/* --- System Responsiveness Breakpoints --- */
@media (max-width: 1024px) {
    :root {
        --screen-pad: 4rem; /* Safe margins for larger iPad formats */
    }
    header {
        padding: 2rem var(--screen-pad);
    }
}

@media (max-width: 768px) {
    :root {
        --screen-pad: 1.5rem; /* Compact padding for standard mobile formats */
    }
    header {
        position: absolute;
        flex-direction: column;
        gap: 1.5rem;
        padding: 2rem var(--screen-pad);
        background: transparent;
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
    }
    nav {
        gap: 1.5rem;
    }
}