* {
    box-sizing: border-box;
}

:root {
    --primary: #e94560;     
    --primary-hover: #d63d53;
    --bg-color: #f3f4f6;    
    --card-bg: #ffffff;       
    --text-main: #2d3436;  
    --text-muted: #636e72;    
    --border-color: #e0e0e0;
    --nav-bg: rgba(255, 255, 255, 0.95);
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

body {
    font-family: 'Segoe UI', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    margin: 0;
    padding: 0;
    line-height: 1.6;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 50px;
    background-color: var(--nav-bg);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary);
    letter-spacing: 1px;
}

.nav-links a {
    color: var(--text-main);
    text-decoration: none;
    margin-left: 30px;
    font-weight: 600;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: var(--primary);
}

.btn-main, button {
    background-color: var(--primary);
    color: white;
    padding: 10px 25px;
    border: none;
    border-radius: 6px; 
    font-weight: bold;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s ease;
    box-shadow: 0 4px 6px rgba(233, 69, 96, 0.2);
}

.btn-main:hover, button:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(233, 69, 96, 0.3);
}

input[type="number"] {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 8px;
    border-radius: 6px;
    font-weight: 600;
    outline: none;
    transition: border 0.3s;
}

input[type="number"]:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(233, 69, 96, 0.1);
}

.container {
    text-align: center;
    width: 90%;
    max-width: 1000px;
    margin: 20px auto;
    position: relative;  
}

.sim-layout {
    display: flex;
    gap: 20px;           
    align-items: stretch; 
    margin-bottom: 20px;
}

.live-data-panel {
    position: relative;
    width: 280px;
    flex-shrink: 0;
    background-color: rgba(255, 255, 255, 0.9); 
    backdrop-filter: blur(5px);
    border: 1px solid var(--border-color);
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    text-align: left;
    font-family: 'Courier New', monospace; 
    overflow-y: auto;
}

.live-data-panel h3 {
    margin: 0 0 10px 0;
    font-size: 1rem;
    color: var(--primary);
    border-bottom: 2px solid var(--primary);
    padding-bottom: 5px;
}

.data-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 5px;
    font-size: 0.9rem;
    color: var(--text-main);
}

.data-row span:last-child {
    font-weight: bold;
    color: var(--text-main);
}

.live-formula {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid #ddd;
    font-size: 0.85rem;
}

.formula-row {
    margin-bottom: 12px;
    color: var(--text-muted);
}

.calc-val {
    color: var(--primary); 
    font-weight: bold;
}

canvas {
    flex-grow: 1;
    width: 100%;
    min-width: 0;
    background-color: var(--card-bg); 
    border: 1px solid var(--border-color);
    border-radius: 12px;
    height: 450px;
    display: block;
    box-shadow: var(--shadow);
}

@media (max-width: 800px) {
    .sim-layout {
        flex-direction: column; 
    }
    .live-data-panel {
        width: 100%; 
        box-sizing: border-box;
    }
}

.controls {
    background-color: var(--card-bg);
    padding: 20px;
    margin-top: 20px;
    border-radius: 12px;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 20px;
    align-items: flex-end;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.control-group {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

label {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 5px;
    font-weight: 600;
}

.checkbox-group label {
    color: var(--text-main);
    cursor: pointer;
}

.stats {
    margin-top: -20px;
    display: flex;
    justify-content: center;
    gap: 40px;
    font-size: 1.2rem;
    color: var(--text-main);
}

.stats span {
    color: var(--primary);
    font-weight: 800;
}

.page-wrapper {
    max-width: 1000px;
    margin: 0 auto;
    padding: 50px 20px;
}

.theory-section {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 50px;
    margin-bottom: 80px;
}

.theory-section:nth-child(even) {
    flex-direction: row-reverse;
}

.topic-card {
    flex: 1;
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
    border: 1px solid var(--border-color);
    border-top: 4px solid var(--primary); 
    border-radius: 16px;
    padding: 40px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 200px;
}

.topic-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
}

.topic-card h2 {
    color: var(--text-main);
    font-size: 2rem;
    margin: 0;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 15px;
}

.topic-content {
    flex: 1.5;
    font-size: 1.1rem;
    color: var(--text-muted);
}

.topic-content strong {
    color: var(--text-main);
}

.equation-box {
    background-color: #ffffff;
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--primary);
    padding: 20px;
    font-family: 'Courier New', monospace;
    margin-top: 15px;
    color: var(--text-main);
    box-shadow: 0 4px 10px rgba(0,0,0,0.03);
    font-weight: bold;
}