:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #1a1a1a;
    --bg-card: #2a2a2a;
    --text-primary: #ffffff;
    --text-secondary: #cccccc;
    --accent: #00ff88;
    --accent-secondary: #ff0066;
    --bit-active: #00ff88;
    --bit-inactive: #333333;
    --border: #333333;
}

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

body {
    font-family: 'Courier New', monospace;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

header {
    text-align: center;
    padding: 2rem 0;
    background: linear-gradient(135deg, var(--bg-primary), var(--bg-secondary));
    border-bottom: 2px solid var(--accent);
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    background: linear-gradient(45deg, var(--accent), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

header p {
    color: var(--text-secondary);
    font-size: 1.2rem;
}

nav {
    background-color: var(--bg-secondary);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--border);
}

nav ul {
    display: flex;
    justify-content: center;
    list-style: none;
    flex-wrap: wrap;
}

nav ul li {
    margin: 0 1rem;
}

nav ul li a {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    transition: all 0.3s ease;
}

nav ul li a:hover {
    color: var(--accent);
    background-color: var(--bg-card);
}

.section {
    padding: 3rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.section h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
    text-align: center;
    color: var(--accent);
}

.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.concept-card {
    background-color: var(--bg-card);
    padding: 2rem;
    border-radius: 10px;
    border: 1px solid var(--border);
    transition: transform 0.3s ease;
}

.concept-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 255, 136, 0.1);
}

.concept-card h3 {
    color: var(--accent);
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.binary-example {
    display: flex;
    gap: 0.5rem;
    margin: 1rem 0;
}

.bit {
    display: inline-block;
    width: 30px;
    height: 30px;
    line-height: 30px;
    text-align: center;
    background-color: var(--bit-inactive);
    color: var(--text-primary);
    border-radius: 5px;
    font-weight: bold;
    transition: all 0.3s ease;
}

.bit[data-value="1"] {
    background-color: var(--bit-active);
    box-shadow: 0 0 10px var(--bit-active);
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

.comparison-table th,
.comparison-table td {
    padding: 0.5rem;
    text-align: center;
    border: 1px solid var(--border);
}

.comparison-table th {
    background-color: var(--bg-secondary);
    color: var(--accent);
}

.calculation {
    font-family: monospace;
    background-color: var(--bg-secondary);
    padding: 1rem;
    border-radius: 5px;
    margin-top: 1rem;
}

.binary-add {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.result {
    color: var(--accent);
    font-weight: bold;
}

.converter-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
}

.converter-card {
    background-color: var(--bg-card);
    padding: 2rem;
    border-radius: 10px;
    border: 1px solid var(--border);
}

.converter-card h3 {
    color: var(--accent);
    margin-bottom: 1.5rem;
}

.input-group {
    margin-bottom: 1.5rem;
}

.input-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.input-group input {
    width: 100%;
    padding: 0.8rem;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    border-radius: 5px;
    font-size: 1rem;
}

.input-group button {
    margin-top: 0.5rem;
    padding: 0.8rem 1.5rem;
    background-color: var(--accent);
    color: var(--bg-primary);
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.input-group button:hover {
    background-color: var(--accent-secondary);
    transform: scale(1.05);
}

.result-display {
    margin-top: 1rem;
    padding: 1rem;
    background-color: var(--bg-secondary);
    border-radius: 5px;
}

.binary-visual {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

.calculation-steps {
    margin-top: 1rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.clock-container {
    text-align: center;
}

.clock-display {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin: 2rem 0;
    flex-wrap: wrap;
}

.time-unit {
    background-color: var(--bg-card);
    padding: 2rem;
    border-radius: 10px;
    border: 1px solid var(--border);
    min-width: 150px;
}

.time-unit h4 {
    color: var(--accent);
    margin-bottom: 1rem;
}

.binary-digits {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin: 1rem 0;
}

.decimal-value {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--accent-secondary);
}

#clock-toggle {
    padding: 1rem 2rem;
    background-color: var(--accent);
    color: var(--bg-primary);
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1.1rem;
    transition: all 0.3s ease;
}

#clock-toggle:hover {
    background-color: var(--accent-secondary);
    transform: scale(1.05);
}

.simulation-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
}

.circuit-card {
    background-color: var(--bg-card);
    padding: 2rem;
    border-radius: 10px;
    border: 1px solid var(--border);
}

.circuit-card h3 {
    color: var(--accent);
    margin-bottom: 1.5rem;
}

.switch-demo {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

.switch-group {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.switch {
    width: 60px;
    height: 30px;
    background-color: var(--bit-inactive);
    border-radius: 15px;
    position: relative;
    cursor: pointer;
    transition: all 0.3s ease;
}

.switch.active {
    background-color: var(--accent);
}

.switch-handle {
    width: 26px;
    height: 26px;
    background-color: white;
    border-radius: 50%;
    position: absolute;
    top: 2px;
    left: 2px;
    transition: all 0.3s ease;
}

.switch.active .switch-handle {
    left: 32px;
}

.switch-value {
    font-weight: bold;
    color: var(--accent);
    font-size: 1.2rem;
}

.binary-display {
    background-color: var(--bg-secondary);
    padding: 1rem;
    border-radius: 5px;
    margin-top: 1rem;
}

.led-display {
    text-align: center;
}

.led-row {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin: 2rem 0;
}

.led {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--bit-inactive);
    transition: all 0.3s ease;
    border: 2px solid var(--border);
}

.led.active {
    background-color: var(--accent);
    box-shadow: 0 0 20px var(--accent);
}

.led-controls input[type="range"] {
    width: 100%;
    margin: 1rem 0;
}

footer {
    text-align: center;
    padding: 2rem;
    background-color: var(--bg-secondary);
    color: var(--text-secondary);
    border-top: 1px solid var(--border);
}

@keyframes pulse {
    0% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.1);
        opacity: 0.8;
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

.bit.active {
    animation: pulse 1s infinite;
}

@media (max-width: 768px) {
    .content-grid,
    .converter-container,
    .simulation-container {
        grid-template-columns: 1fr;
    }
    
    .clock-display {
        flex-direction: column;
        align-items: center;
    }
    
    nav ul {
        flex-direction: column;
        align-items: center;
    }
    
    .section {
        padding: 2rem 1rem;
    }
}