/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f5f7fa;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 30px;
    padding: 20px 0;
    background: linear-gradient(135deg, gray 0%, darkgray 100%);
    color: white;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    font-weight: 700;
}

header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* Main Content */
.main-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto auto;
    gap: 20px;
    grid-template-areas: 
        "parameters results"
        "chart chart";
}

.parameters-card {
    grid-area: parameters;
}

.results-card {
    grid-area: results;
}

.chart-card {
    grid-area: chart;
}

/* Cards */
.card {
    background: white;
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    border: 1px solid #e1e8ed;
}

.card h2 {
    color: #2c3e50;
    margin-bottom: 20px;
    font-size: 1.4rem;
    font-weight: 600;
    border-bottom: 2px solid #667eea;
    padding-bottom: 10px;
}

/* Form Styles */
.param-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-bottom: 20px;
}

.param-row {
    display: flex;
    flex-direction: column;
}

.param-row label {
    font-weight: 500;
    margin-bottom: 5px;
    color: #555;
    font-size: 0.9rem;
}

.param-row input {
    padding: 10px 12px;
    border: 2px solid #e1e8ed;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.param-row input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

/* Button Styles */
.button-group {
    display: flex;
    gap: 12px;
    margin-top: 25px;
}

button {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

#startBtn {
    background: linear-gradient(135deg, #28a745, #20c997);
    color: white;
    flex: 1;
}

#startBtn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(40, 167, 69, 0.3);
}

#stopBtn {
    background: linear-gradient(135deg, #dc3545, #e83e8c);
    color: white;
    flex: 1;
}

#stopBtn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(220, 53, 69, 0.3);
}

#resetBtn {
    background: linear-gradient(135deg, #6c757d, #495057);
    color: white;
    flex: 0.7;
}

#resetBtn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(108, 117, 125, 0.3);
}

button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

/* Results Grid */
.results-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-bottom: 25px;
}

.result-item {
    background: #f8f9fa;
    padding: 15px;
    border-radius: 8px;
    border-left: 4px solid #667eea;
}

.result-item label {
    display: block;
    font-weight: 600;
    color: #555;
    margin-bottom: 5px;
    font-size: 0.9rem;
}

.result-item span {
    font-size: 1.3rem;
    font-weight: 700;
    color: #2c3e50;
}

/* Progress Bar */
.progress-container {
    margin-top: 20px;
}

.progress-bar {
    width: 100%;
    height: 12px;
    background-color: #e9ecef;
    border-radius: 6px;
    overflow: hidden;
    margin-bottom: 10px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #667eea, #764ba2);
    border-radius: 6px;
    transition: width 0.3s ease;
    width: 0%;
}

#progressText {
    font-size: 0.9rem;
    color: #666;
    font-weight: 500;
}

/* Chart */

.chart-card {
    display: flex;
    justify-content: center;
    align-items: center;
}

.chart-card canvas {
    width: 80vw !important;
    height: 80vh !important;
    max-width: 80vw !important;
    max-height: 80vh !important;
    min-width: 300px;
    min-height: 300px;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

/* Responsive Design */
@media (max-width: 768px) {
    .main-content {
        grid-template-columns: 1fr;
        grid-template-areas: 
            "parameters"
            "results"
            "chart";
    }
    
    .param-group {
        grid-template-columns: 1fr;
    }
    
    .results-grid {
        grid-template-columns: 1fr;
    }
    
    .button-group {
        flex-direction: column;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .container {
        padding: 10px;
    }
}

/* Animation for price updates */
.price-update {
    animation: highlightUpdate 0.5s ease-in-out;
}

@keyframes highlightUpdate {
    0% { background-color: #fff3cd; }
    100% { background-color: transparent; }
}

/* Loading state */
.loading {
    position: relative;
    overflow: hidden;
}

.loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.6), transparent);
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0% { left: -100%; }
    100% { left: 100%; }
}