:root {
    --bg-dark: #0f172a;
    --bg-panel: #1e293b;
    --text-main: #e2e8f0;
    --text-muted: #94a3b8;
    --accent-blue: #38bdf8;
    --accent-glow: rgba(56, 189, 248, 0.4);
    --led-off: #334155;
    --led-on: #10b981;
    --led-on-glow: rgba(16, 185, 129, 0.6);
    --border-color: #334155;
}

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

body {
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.6;
}

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

.site-header {
    background-color: var(--bg-panel);
    padding: 20px 0;
    border-bottom: 2px solid var(--accent-blue);
}

.site-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
}

.logo-area h1 {
    color: var(--accent-blue);
    font-weight: 800;
    margin: 0;
    font-size: 1.8rem;
}

.tagline {
    color: var(--text-muted);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 20px;
}

nav a {
    color: var(--text-main);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.2s;
}

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

.content-section {
    background: var(--bg-panel);
    margin: 40px 0;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.3);
}

.content-section h2 {
    color: var(--accent-blue);
    margin-bottom: 20px;
    font-size: 1.8rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
}

.content-section p {
    margin-bottom: 15px;
    font-size: 1.05rem;
}

/* Simulator Layout */
.sim-board {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: #0b1121;
    padding: 40px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    flex-wrap: wrap;
    gap: 30px;
}

.inputs-column, .gate-column, .output-column {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.input-module label, .output-column label {
    display: block;
    text-align: center;
    margin-bottom: 8px;
    font-weight: bold;
    color: var(--text-muted);
}

.toggle-btn {
    width: 60px;
    height: 60px;
    border-radius: 8px;
    background: var(--led-off);
    border: 2px solid var(--border-color);
    color: white;
    font-size: 1.5rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.2s;
}

.toggle-btn[data-state="1"] {
    background: var(--accent-blue);
    border-color: var(--accent-blue);
    box-shadow: 0 0 15px var(--accent-glow);
}

.gate-selector select {
    padding: 10px;
    border-radius: 4px;
    background: var(--bg-dark);
    color: white;
    border: 1px solid var(--border-color);
    font-size: 1.1rem;
    margin-top: 5px;
}

.gate-symbol {
    width: 120px;
    height: 80px;
    background: var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px 40px 40px 10px;
    position: relative;
    border: 2px solid var(--accent-blue);
}

.gate-symbol .gate-name {
    font-weight: 900;
    font-size: 1.5rem;
    letter-spacing: 2px;
}

.led-indicator {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--led-off);
    border: 2px solid #555;
    transition: all 0.2s;
    margin-bottom: 10px;
}

.led-indicator.active {
    background: var(--led-on);
    border-color: #fff;
    box-shadow: 0 0 25px var(--led-on-glow);
}

.output-val {
    font-size: 1.8rem;
    font-weight: bold;
}

/* Theory Grid */
.theory-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.theory-card {
    background: #0b1121;
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.theory-card h3 {
    color: var(--accent-blue);
    margin-bottom: 10px;
}

.truth-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
}

.truth-table th, .truth-table td {
    border: 1px solid var(--border-color);
    padding: 8px;
    text-align: center;
}

.truth-table th {
    background: #1e293b;
}

.highlight-row {
    background: rgba(16, 185, 129, 0.1);
}

.site-footer {
    background: var(--bg-panel);
    padding: 30px 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
    margin-top: 40px;
}

.footer-links {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 15px;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
}

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

@media (max-width: 768px) {
    .sim-board {
        flex-direction: column;
    }
    .gate-symbol {
        transform: rotate(90deg);
        margin: 20px 0;
    }
    .gate-symbol .gate-name {
        transform: rotate(-90deg);
    }
}



/* Factory-injected deployment helpers. The AI owns the site design above this block. */
.ad-unit {
  width: min(100%, 720px);
  min-height: 120px;
  margin: 24px auto;
  display: block;
}

.legal-page {
  width: min(900px, calc(100% - 32px));
  margin: 40px auto;
}

.factory-fallback-nav {
  width: min(900px, calc(100% - 32px));
  margin: 24px auto 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  align-items: center;
  font-size: 0.95rem;
}

.factory-fallback-nav a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}