:root {
    --bg-dark: #000000;       
    --bg-card: #0a0a0a;       
    --accent-blue: #3b82f6;   
    --text-main: #f8fafc;     
    --text-muted: #94a3b8;    
    --border: rgba(255, 255, 255, 0.08);
}

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

body {
    overflow-x: hidden; /* Prevent horizontal scroll */
}

html {
    scroll-behavior: smooth;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.6;
}

/* Navigation */
header {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(20px);
    z-index: 1000;
    border-bottom: 1px solid var(--border);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 2rem;
}

.logo {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.04em;
    background: linear-gradient(135deg, #ffffff 0%, var(--accent-blue) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Desktop Nav */
.nav-links {
    display: flex;
    align-items: center;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    margin-left: 2rem;
    font-size: 0.9rem;
    font-weight: 600;
    transition: all 0.3s ease;
}

.nav-links a:hover { color: var(--accent-blue); }

/* Hamburger Menu (Hidden on desktop) */
.hamburger {
    display: none;
    cursor: pointer;
    z-index: 1001;
}

.hamburger div {
    width: 25px;
    height: 3px;
    background-color: var(--text-main);
    margin: 5px;
    transition: all 0.3s ease;
}

/* Home Section */
#intro {
    text-align: center;
    padding-top: 12rem;
}

#intro h1 {
    font-size: clamp(3rem, 7vw, 5rem);
    margin-bottom: 2.5rem;
    font-weight: 800;
}

#intro p {
    font-size: 1.25rem;
    max-width: 900px;
    margin: 0 auto 4rem auto;
}

.term-highlight {
    color: var(--accent-blue);
    border-bottom: 2px dashed rgba(59, 130, 246, 0.6);
    cursor: help;
    position: relative;
    font-weight: 700;
    font-size: 1.35rem;
    text-transform: uppercase;
}

.tooltip {
    visibility: hidden;
    position: absolute;
    bottom: 150%;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    background: #111;
    color: #fff;
    padding: 1.5rem 2rem;
    border-radius: 12px;
    font-size: 1.1rem;
    width: 350px;
    border: 1px solid var(--border);
    opacity: 0;
    transition: all 0.3s ease;
    pointer-events: none;
    text-transform: none;
}

.term-highlight:hover .tooltip {
    visibility: visible;
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.cta-btn {
    display: inline-block;
    background: var(--accent-blue);
    color: white;
    padding: 1.2rem 4rem;
    border-radius: 10px;
    font-weight: 800;
    margin-top: 2rem;
    text-decoration: none;
    transition: all 0.3s ease;
}

/* Solutions Section */
#solutions {
    max-width: 100vw;
    padding: 8rem 2rem;
}

.grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr); /* Force 4 in a row */
    gap: 1.5rem;
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 2.5rem 1.5rem;
    border-radius: 12px;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
}

.card:hover {
    border-color: var(--accent-blue);
    transform: translateY(-5px);
}

.card h3 {
    font-size: 1.2rem;
    color: var(--accent-blue);
    margin-bottom: 1rem;
}

/* Solutions Detail - Dedicated area below the grid */
.detail-display {
    margin-top: 4rem;
    min-height: 400px;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    width: 100%;
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
    opacity: 0;
    transition: opacity 0.5s ease;
    scroll-margin-top: 100px; /* Offset for fixed header */
}

.detail-display.active {
    opacity: 1;
}

.detail-content h4 {
    font-size: 3rem;
    color: var(--accent-blue);
    margin-bottom: 2rem;
}

.detail-content p {
    font-size: 1.5rem;
    color: var(--text-main);
    line-height: 1.8;
}

/* Mobile Navigation & Layout */
@media (max-width: 1024px) {
    .grid {
        grid-template-columns: 1fr; /* Stack on mobile */
    }
    
    .hamburger { display: block; }
    
    .nav-links {
        position: fixed;
        right: -100%;
        top: 0;
        height: 100vh;
        width: 70%;
        background: #0a0a0a;
        flex-direction: column;
        justify-content: center;
        transition: right 0.5s ease;
        border-left: 1px solid var(--border);
    }
    
    .nav-links.nav-active {
        right: 0;
    }
    
    .nav-links a {
        margin: 2rem 0;
        font-size: 1.5rem;
    }
    
    .detail-display {
        min-height: auto;
        margin-top: 2rem;
    }
    
    .detail-content h4 { font-size: 2rem; }
    .detail-content p { font-size: 1.1rem; }
}

/* Reveal */
.reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.8s ease;
}
.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

.email-link {
    font-size: clamp(1.5rem, 5vw, 3.5rem);
    color: #fff;
    text-decoration: none;
    font-weight: 800;
}