:root {
    --bg-color: #0b0c10;          /* Deep matte obsidian black */
    --pcb-grid: #12131a;          /* Background substrate grid line */
    --copper-orange: #ff7700;     /* Vibrant trace copper orange */
    --solder-gold: #ffaa00;       /* Component pads and highlights */
    --text-primary: #e2e8f0;      /* Clean, readable technical white */
    --text-muted: #718096;        /* Subdued text for structural notes */
    --border-trace: #242933;      /* Dark trace lines */
}

body {
    background-color: var(--bg-color);
    /* PCB Substrate grid pattern */
    background-image: 
        linear-gradient(var(--pcb-grid) 1px, transparent 1px),
        linear-gradient(90deg, var(--pcb-grid) 1px, transparent 1px);
    background-size: 20px 20px;
    color: var(--text-primary);
    font-family: 'Courier New', Courier, monospace;
    line-height: 1.6;
    margin: 0;
    padding: 0;
}

/* Removes the old fuzzy CRT line overlay completely */
.crt-overlay {
    display: none;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 40px 20px;
}

/* Header styled like a manufacturing fabrication block */
header.terminal-header {
    border: 2px solid var(--copper-orange);
    border-left: 8px solid var(--copper-orange); /* Thick trace anchor */
    padding: 25px;
    background: rgba(11, 12, 16, 0.9);
    margin-bottom: 40px;
    position: relative;
}

/* Small aesthetic designators mimicking silkscreen markings */
header.terminal-header::before {
    content: "LAYER_01_TOP_COPPER // REV_2026.4";
    position: absolute;
    top: -12px;
    right: 15px;
    background: var(--bg-color);
    color: var(--solder-gold);
    font-size: 0.75rem;
    padding: 0 5px;
}

h1 { 
    color: var(--copper-orange); 
    margin: 0 0 10px 0; 
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: 1px;
}

h2 { 
    color: var(--solder-gold); 
    border-bottom: 2px solid var(--border-trace); 
    padding-bottom: 8px;
    font-size: 1.3rem;
    margin-top: 40px;
}

.subtitle {
    color: var(--text-muted);
    margin: 0 0 20px 0;
}

/* Technical Copper Interface Buttons */
.btn, .btn-sm {
    background: transparent;
    color: var(--copper-orange);
    border: 1px solid var(--copper-orange);
    padding: 10px 18px;
    cursor: pointer;
    font-family: inherit;
    font-weight: bold;
    text-decoration: none;
    display: inline-block;
    margin-right: 12px;
    margin-top: 10px;
    transition: all 0.2s ease-in-out;
}

.btn:hover, .btn-sm:hover {
    background: rgba(255, 119, 0, 0.1);
    color: var(--solder-gold);
    border-color: var(--solder-gold);
    box-shadow: 0 0 8px rgba(255, 170, 0, 0.3);
}

.btn-sm { 
    padding: 6px 12px; 
    font-size: 0.8rem; 
}

/* Grid Layouts for Content Matrix */
.skills-grid, .projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin-bottom: 40px;
}

/* Cards styled to look like mounted silicon components */
.skill-card, .project-card {
    border: 1px solid var(--border-trace);
    border-top: 3px solid var(--copper-orange); /* Solder mask link */
    padding: 22px;
    background: #11141a;
    position: relative;
}

.skill-card h3, .project-card h3 {
    color: var(--copper-orange);
    margin-top: 0;
    font-size: 1.1rem;
}

.skill-card ul {
    padding-left: 20px;
    margin: 0;
}

.skill-card li {
    margin-bottom: 6px;
    color: var(--text-primary);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    margin-bottom: 12px;
}

.project-desc {
    color: var(--text-primary);
    font-size: 0.9rem;
    margin-bottom: 20px;
}

/* Component status tags resembling silkscreen test point indicators */
.status-tag {
    font-size: 0.7rem;
    background: transparent;
    padding: 2px 6px;
    border: 1px dashed var(--solder-gold);
    color: var(--solder-gold);
}

/* Modal Popups for Schematics/Blueprints */
.modal {
    display: none;
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.9);
    z-index: 1000;
}

.modal-content {
    background: var(--bg-color);
    margin: 8% auto;
    padding: 25px;
    width: 85%;
    max-width: 850px;
    border: 2px solid var(--copper-orange);
    box-shadow: 0 0 20px rgba(255, 119, 0, 0.2);
}

.close-btn {
    float: right;
    font-size: 2rem;
    cursor: pointer;
    color: var(--copper-orange);
    line-height: 1;
}

.close-btn:hover {
    color: var(--solder-gold);
}

/* Blueprint viewer module inside the popup window */
.blueprint-placeholder {
    border: 1px solid var(--border-trace);
    height: 350px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #06090e; 
    color: var(--text-muted);
    font-size: 0.9rem;
}
/* Oscilloscope Background Canvas Layer */
#scopeCanvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;          /* Locks it strictly behind your text and cards */
    pointer-events: none; /* Allows you to still click buttons right through it */
    opacity: 0.15;        /* Subdued baseline brightness so your text stays highly readable */
}