/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 30px;
    color: white;
}

.title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 8px;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
    font-weight: 300;
}

/* Main content layout */
.main-content {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 30px;
    align-items: start;
}

@media (max-width: 1024px) {
    .main-content {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}

/* Cards */
.card {
    background: white;
    border-radius: 12px;
    padding: 24px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1), 0 1px 3px rgba(0, 0, 0, 0.08);
    margin-bottom: 20px;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15), 0 3px 6px rgba(0, 0, 0, 0.1);
}

.card-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: #2d3748;
    border-bottom: 2px solid #e2e8f0;
    padding-bottom: 8px;
}

/* Input groups */
.input-group {
    margin-bottom: 16px;
}

.input-group:last-child {
    margin-bottom: 0;
}

.input-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    color: #4a5568;
    font-size: 0.9rem;
}

/* Input styles */
input[type="text"],
input[type="number"] {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
    background: #f7fafc;
}

input[type="text"]:focus,
input[type="number"]:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    background: white;
}

.formula-input {
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 1.1rem;
}

.formula-help {
    margin-top: 6px;
    color: #718096;
    font-size: 0.85rem;
}

/* Axis and range inputs */
.axis-inputs,
.range-inputs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

/* Parameters */
.parameters-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.parameter-input {
    display: flex;
    flex-direction: column;
}

.parameter-input label {
    font-weight: 600;
    color: #667eea;
    font-size: 1rem;
}

/* Buttons */
.actions {
    display: flex;
    gap: 12px;
    margin-top: 8px;
}

.btn {
    flex: 1;
    padding: 14px 20px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
}

.btn-secondary {
    background: #e2e8f0;
    color: #4a5568;
}

.btn-secondary:hover {
    background: #cbd5e0;
    transform: translateY(-1px);
}

.btn:active {
    transform: translateY(0);
}

.btn-icon {
    font-size: 1.1rem;
}

/* Plot panel */
.plot-panel {
    min-height: 600px;
}

.plot-card {
    height: 100%;
    padding: 0;
    overflow: hidden;
}

.plot-container {
    width: 100%;
    height: 600px;
    position: relative;
}

.plot-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    background: linear-gradient(135deg, #f7fafc 0%, #edf2f7 100%);
    border-radius: 12px;
}

.placeholder-content {
    text-align: center;
    color: #718096;
    max-width: 400px;
    padding: 40px;
}

.placeholder-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.placeholder-content h3 {
    font-size: 1.5rem;
    margin-bottom: 12px;
    color: #4a5568;
}

.placeholder-content p {
    margin-bottom: 24px;
    font-size: 1.1rem;
}

.example-formulas {
    text-align: left;
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.example-formulas h4 {
    color: #2d3748;
    margin-bottom: 12px;
    font-size: 1rem;
}

.example-formulas ul {
    list-style: none;
}

.example-formulas li {
    margin-bottom: 8px;
    padding: 6px 0;
}

.example-formulas code {
    background: #667eea;
    color: white;
    padding: 4px 8px;
    border-radius: 4px;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.9rem;
    margin-right: 8px;
}

/* Error container */
.error-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    max-width: 400px;
}

.error-message {
    background: #fed7d7;
    color: #c53030;
    padding: 16px 20px;
    border-radius: 8px;
    border-left: 4px solid #e53e3e;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    display: flex;
    align-items: center;
    gap: 12px;
    animation: slideIn 0.3s ease;
}

.error-icon {
    font-size: 1.2rem;
}

/* Loading container */
.loading-container {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: white;
    padding: 30px 40px;
    border-radius: 12px;
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
    text-align: center;
    z-index: 1000;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #e2e8f0;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 16px;
}

/* Animations */
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .title {
        font-size: 2rem;
    }
    
    .card {
        padding: 20px;
    }
    
    .axis-inputs,
    .range-inputs,
    .parameters-container {
        grid-template-columns: 1fr;
    }
    
    .actions {
        flex-direction: column;
    }
    
    .plot-container {
        height: 400px;
    }
}