/* --- OpenVCU Electric Theme Variables --- */
:root {
    --neon-blue: #00d2ff;
    --neon-blue-dim: rgba(0, 210, 255, 0.15);
    --copper-accent: #ff7a00;
    --bg-page: #080c11;        /* Dark PCB substrate */
    --surface-card: #111823;   /* Slightly lighter dark panel */
    --text-primary: #e2e8f0;   /* Light gray/white text */
    --text-muted: #8b9bb4;     /* Dimmed text */
    --border-color: #1e2d40;   /* Dark blue/gray borders */
    
    /* Glowing Effects */
    --glow-subtle: 0 0 10px rgba(0, 210, 255, 0.1), inset 0 0 5px rgba(0, 210, 255, 0.05);
    --glow-hover: 0 0 15px rgba(0, 210, 255, 0.3), inset 0 0 10px rgba(0, 210, 255, 0.1);
    --glow-copper: 0 0 15px rgba(255, 122, 0, 0.4);
    
    --border-radius: 6px;      /* Sharper edges for a hardware feel */
}

/* --- Base Styles with PCB Grid Background --- */
body {
    background-color: var(--bg-page);
    /* CSS Circuit Board / Dot Grid Pattern */
    background-image: 
        radial-gradient(var(--border-color) 1px, transparent 1px),
        radial-gradient(var(--border-color) 1px, transparent 1px);
    background-size: 30px 30px;
    background-position: 0 0, 15px 15px;
    color: var(--text-primary);
    font-family: 'Courier New', Courier, monospace; /* Monospace fits the hardware theme well, change to sans-serif if preferred */
    margin: 0;
    padding: 0;
    line-height: 1.6;
}

.container {
    width: 90%;
    max-width: 900px;
    margin: 90px auto 30px auto;
    padding: 20px;
}

/* --- Content Sections (Modules) --- */
section {
    background-color: var(--surface-card);
    border: 1px solid var(--border-color);
    border-left: 3px solid var(--neon-blue); /* Trace accent */
    padding: 30px;
    margin-bottom: 25px;
    border-radius: var(--border-radius);
    box-shadow: var(--glow-subtle);
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

section:hover {
    box-shadow: var(--glow-hover);
    border-color: var(--neon-blue);
    transform: translateY(-2px);
}

h1, h2, h3 {
    color: var(--neon-blue);
    margin-top: 0;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Add a blinking cursor effect to H1s for a terminal feel */
h1::after {
    content: '_';
    animation: blink 1s step-end infinite;
}
@keyframes blink { 50% { opacity: 0; } }

ul {
    list-style-type: square;
    padding-left: 20px;
    color: var(--text-primary);
}

ul li::marker {
    color: var(--copper-accent);
}

a {
    color: var(--neon-blue);
    text-decoration: none;
    transition: color 0.2s ease, text-shadow 0.2s ease;
}

a:hover {
    color: var(--copper-accent);
    text-shadow: 0 0 8px var(--copper-accent);
}

/* --- Navigation (Desktop & Mobile) --- */
.top-nav {
    background-color: rgba(8, 12, 17, 0.9);
    border-bottom: 1px solid var(--neon-blue);
    box-shadow: 0 0 15px var(--neon-blue-dim);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 15px 20px;
}

.logo {
    font-weight: 800;
    font-size: 1.3rem;
    color: var(--text-primary);
    letter-spacing: 1px;
    display: flex;
    align-items: center;
    gap: 10px;
}

/* Stylize the OpenVCU text */
.logo span {
    color: var(--neon-blue);
    text-shadow: 0 0 10px var(--neon-blue);
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 15px;
    margin: 0;
    padding: 0;
}

.nav-links li a {
    padding: 8px 14px;
    border-radius: var(--border-radius);
    font-weight: 600;
    color: var(--text-primary);
    text-transform: uppercase;
    font-size: 0.9rem;
    letter-spacing: 0.5px;
    border: 1px solid transparent;
    transition: all 0.2s ease;
}

.nav-links li a:hover {
    background-color: var(--neon-blue-dim);
    border-color: var(--neon-blue);
    color: var(--neon-blue);
    box-shadow: var(--glow-subtle);
}

/* Hamburger Control */
.hamburger {
    display: none;
    font-size: 1.8rem;
    color: var(--neon-blue);
    cursor: pointer;
    user-select: none;
    text-shadow: 0 0 5px var(--neon-blue);
}

.menu-checkbox {
    display: none;
}

/* --- Mobile Responsiveness --- */
@media (max-width: 768px) {
    .hamburger { display: block; }
    .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--surface-card);
        border-bottom: 1px solid var(--neon-blue);
        box-shadow: 0 10px 15px rgba(0, 0, 0, 0.5);
        padding: 15px 0;
    }
    .nav-links li { text-align: center; padding: 8px 0; }
    .menu-checkbox:checked ~ .nav-links { display: flex; }
}

/* --- Tables (Data Sheets) --- */
table {
    width: 100%;
    border-collapse: collapse;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    background-color: var(--bg-page);
}

table, th, td {
    padding: 12px 16px;
    text-align: left;
}

th {
    background-color: var(--border-color);
    color: var(--neon-blue);
    font-weight: 600;
    border-bottom: 2px solid var(--neon-blue);
    text-transform: uppercase;
    font-size: 0.9rem;
}

td {
    border-bottom: 1px solid var(--border-color);
}

tr:hover td {
    background-color: var(--neon-blue-dim);
}

/* --- Hardware Buttons --- */
.term-btn {
    display: inline-block;
    padding: 10px 20px;
    margin-top: 15px;
    background-color: transparent;
    color: var(--neon-blue);
    font-weight: 600;
    border: 1px solid var(--neon-blue);
    border-radius: var(--border-radius);
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.2s ease;
}

.term-btn:hover {
    background-color: var(--neon-blue);
    color: var(--bg-page);
    box-shadow: var(--glow-hover);
    text-shadow: none;
}

/* Primary Action Button (Copper/High Voltage) */
.primary-action {
    border-color: var(--copper-accent);
    color: var(--copper-accent);
}

.primary-action:hover {
    background-color: var(--copper-accent);
    color: var(--bg-page);
    box-shadow: var(--glow-copper);
}

.footer {
    text-align: center;
    padding: 25px 0;
    color: var(--text-muted);
    font-size: 0.9rem;
    border-top: 1px dashed var(--border-color);
    margin-top: 40px;
}