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

:root {
    --oscilloscope-green: #00ff00;
    --oscilloscope-glow: #00ff0080;
    --oscilloscope-bg: #0a0a0a;
    --oscilloscope-grid: #1a1a1a;
    --control-bg: #1e1e1e;
    --text-primary: #e0e0e0;
    --text-secondary: #a0a0a0;
    --accent-color: #00cc00;
    --border-color: #333;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #0d0d0d 0%, #1a1a1a 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.ac-characteristics-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 30px;
    padding: 30px 20px;
    background: linear-gradient(135deg, #1a1a1a 0%, #2a2a2a 100%);
    border-radius: 10px;
    border: 1px solid var(--border-color);
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    color: var(--oscilloscope-green);
    text-shadow: 0 0 10px var(--oscilloscope-glow);
}

header .subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.simulation-layout {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 20px;
    margin-bottom: 30px;
}

@media (max-width: 1024px) {
    .simulation-layout {
        grid-template-columns: 1fr;
    }
}

.waveform-panel {
    background: var(--control-bg);
    border-radius: 10px;
    padding: 20px;
    border: 1px solid var(--border-color);
}

.waveform-panel h3 {
    color: var(--oscilloscope-green);
    margin-bottom: 20px;
    font-size: 1.3rem;
}

.waveform-display {
    margin-bottom: 25px;
}

.wave-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
    flex-wrap: wrap;
}

.wave-header h4 {
    color: var(--text-primary);
    font-size: 1.1rem;
}

.formula-display {
    background: var(--oscilloscope-bg);
    color: var(--oscilloscope-green);
    padding: 5px 15px;
    border-radius: 5px;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    border: 1px solid var(--border-color);
}

.oscilloscope-screen {
    position: relative;
    background: var(--oscilloscope-bg);
    border: 3px solid #2a2a2a;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: inset 0 0 30px rgba(0, 0, 0, 0.5);
}

.oscilloscope-screen canvas {
    display: block;
    width: 100%;
    height: 200px;
}

.grid-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        linear-gradient(var(--oscilloscope-grid) 1px, transparent 1px),
        linear-gradient(90deg, var(--oscilloscope-grid) 1px, transparent 1px);
    background-size: 20px 20px;
    pointer-events: none;
    opacity: 0.5;
}

.statistics-panel {
    background: var(--oscilloscope-bg);
    border-radius: 8px;
    padding: 20px;
    border: 1px solid var(--border-color);
}

.statistics-panel h4 {
    color: var(--oscilloscope-green);
    margin-bottom: 15px;
    font-size: 1.1rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
}

.stat-item {
    background: var(--control-bg);
    padding: 12px;
    border-radius: 5px;
    border: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.stat-item span:first-child {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.stat-value {
    color: var(--oscilloscope-green);
    font-weight: bold;
    font-size: 1.1rem;
    font-family: 'Courier New', monospace;
}

.controls-panel {
    background: var(--control-bg);
    border-radius: 10px;
    padding: 20px;
    border: 1px solid var(--border-color);
    height: fit-content;
}

.controls-panel h4 {
    color: var(--oscilloscope-green);
    margin-bottom: 20px;
    font-size: 1.3rem;
}

.control-group {
    margin-bottom: 25px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

.control-group:last-of-type {
    border-bottom: none;
}

.control-group label {
    display: block;
    margin-bottom: 10px;
    color: var(--text-primary);
    font-weight: 500;
}

.control-group input[type="range"] {
    width: 100%;
    height: 8px;
    background: var(--oscilloscope-bg);
    border-radius: 4px;
    outline: none;
    -webkit-appearance: none;
    margin-bottom: 8px;
}

.control-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--accent-color);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 10px var(--oscilloscope-glow);
}

.control-group input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: var(--accent-color);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    box-shadow: 0 0 10px var(--oscilloscope-glow);
}

.control-info {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 5px;
}

.presets-section {
    margin-bottom: 25px;
}

.presets-section h4 {
    color: var(--oscilloscope-green);
    margin-bottom: 15px;
    font-size: 1.1rem;
}

.preset-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.preset-btn {
    background: var(--oscilloscope-bg);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 12px 15px;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.9rem;
}

.preset-btn:hover {
    background: var(--accent-color);
    color: var(--oscilloscope-bg);
    border-color: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 255, 0, 0.3);
}

.animation-control {
    margin-bottom: 20px;
}

.animation-control h4 {
    color: var(--oscilloscope-green);
    margin-bottom: 15px;
    font-size: 1.1rem;
}

.animation-buttons {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
}

.anim-btn {
    flex: 1;
    background: var(--oscilloscope-bg);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 12px;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.anim-btn:hover {
    background: var(--accent-color);
    color: var(--oscilloscope-bg);
    border-color: var(--accent-color);
}

.anim-btn .icon {
    font-size: 1.2rem;
}

.speed-control {
    margin-top: 15px;
}

.speed-control label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.formulas-section {
    background: var(--control-bg);
    border-radius: 10px;
    padding: 30px;
    margin-bottom: 30px;
    border: 1px solid var(--border-color);
}

.formulas-section h3 {
    color: var(--oscilloscope-green);
    margin-bottom: 20px;
    font-size: 1.5rem;
}

.formula-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.formula-card {
    background: var(--oscilloscope-bg);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.formula-card h4 {
    color: var(--text-primary);
    margin-bottom: 10px;
    font-size: 1rem;
}

.formula {
    color: var(--oscilloscope-green);
    font-family: 'Courier New', monospace;
    font-size: 1.1rem;
    text-align: center;
    padding: 10px;
    background: rgba(0, 255, 0, 0.05);
    border-radius: 5px;
}

.explanation {
    background: var(--control-bg);
    border-radius: 10px;
    padding: 30px;
    border: 1px solid var(--border-color);
}

.explanation h2 {
    color: var(--oscilloscope-green);
    margin-bottom: 20px;
    font-size: 1.8rem;
}

.explanation h3 {
    color: var(--accent-color);
    margin-top: 30px;
    margin-bottom: 15px;
    font-size: 1.4rem;
}

.explanation p {
    color: var(--text-primary);
    margin-bottom: 15px;
    line-height: 1.8;
}

.comparison-table {
    overflow-x: auto;
    margin: 20px 0;
}

.comparison-table table {
    width: 100%;
    border-collapse: collapse;
    background: var(--oscilloscope-bg);
    border-radius: 8px;
    overflow: hidden;
}

.comparison-table th,
.comparison-table td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.comparison-table th {
    background: var(--accent-color);
    color: var(--oscilloscope-bg);
    font-weight: bold;
}

.comparison-table tr:hover {
    background: rgba(0, 255, 0, 0.05);
}

.standards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin: 20px 0;
}

.standard-card {
    background: var(--oscilloscope-bg);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.standard-card h4 {
    color: var(--oscilloscope-green);
    margin-bottom: 15px;
    font-size: 1.2rem;
}

.standard-details {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.standard-details div {
    color: var(--text-primary);
    font-size: 0.95rem;
}

.applications-list {
    list-style: none;
    padding: 0;
}

.applications-list li {
    background: var(--oscilloscope-bg);
    padding: 15px;
    margin-bottom: 10px;
    border-radius: 5px;
    border-left: 3px solid var(--accent-color);
}

.applications-list li strong {
    color: var(--oscilloscope-green);
}

@media (max-width: 768px) {
    header h1 {
        font-size: 1.8rem;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .preset-buttons {
        grid-template-columns: 1fr;
    }

    .formula-grid {
        grid-template-columns: 1fr;
    }

    .standards-grid {
        grid-template-columns: 1fr;
    }
}