:root {
    --primary-color: #2196f3;
    --secondary-color: #1976d2;
    --background-color: #f5f7fa;
    --card-background: #ffffff;
    --text-primary: #2c3e50;
    --text-secondary: #607d8b;
    --success-color: #4caf50;
    --danger-color: #f44336;
    --border-radius: 12px;
    --box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

body {
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 2rem;
}

/* Dashboard Header */
.dashboard-header {
    background: var(--card-background);
    padding: 1.5rem 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin-bottom: 2rem;
}

.dashboard-header h1 {
    color: var(--text-primary);
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
}

.controls {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    align-items: center;
}

/* Search Box */
.search-box {
    position: relative;
    flex: 1;
    min-width: 250px;
}

.search-box i {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
}

.search-box input {
    width: 100%;
    padding: 0.8rem 1rem 0.8rem 2.5rem;
    border: 1px solid #e0e0e0;
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(33, 150, 243, 0.1);
}

/* Select Controls */
select {
    padding: 0.8rem 1.5rem;
    border: 1px solid #e0e0e0;
    border-radius: var(--border-radius);
    background-color: white;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

select:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* Buttons */
.btn {
    padding: 0.8rem 1.5rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.btn:hover {
    background-color: var(--secondary-color);
}

/* Crypto Grid */
.crypto-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.crypto-card {
    background: var(--card-background);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer;
}

.crypto-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.crypto-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.crypto-icon {
    width: 32px;
    height: 32px;
    object-fit: contain;
}

.crypto-name {
    font-weight: 600;
    color: var(--text-primary);
}

.crypto-price {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0.5rem 0;
}

.crypto-change {
    font-weight: 600;
    margin-bottom: 1rem;
}

.crypto-change.positive {
    color: var(--success-color);
}

.crypto-change.negative {
    color: var(--danger-color);
}

/* Comparison Container */
.comparison-container {
    display: none;
    background: var(--card-background);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin: 2rem 0;
}

.comparison-container h2 {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.comparison-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.comparison-item {
    background: var(--background-color);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

/* Search History */
.search-history {
    background: var(--card-background);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin: 2rem 0;
}

.search-history h2 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.history-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.8rem;
    background: var(--background-color);
    border-radius: var(--border-radius);
    margin-bottom: 0.5rem;
}

.history-item button {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 0.5rem;
    transition: color 0.3s ease;
}

.history-item button:hover {
    color: var(--primary-color);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
}

.modal-content {
    position: relative;
    background: var(--card-background);
    margin: 5% auto;
    padding: 2rem;
    width: 90%;
    max-width: 800px;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.close {
    position: absolute;
    right: 1.5rem;
    top: 1.5rem;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: color 0.3s ease;
}

.close:hover {
    color: var(--danger-color);
}

#detailsContainer {
    margin-bottom: 2rem;
}

#detailsContainer h2 {
    color: var(--text-primary);
    margin-bottom: 1rem;
}

#detailsContainer p {
    margin: 0.5rem 0;
    color: var(--text-secondary);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    .controls {
        flex-direction: column;
    }

    .search-box {
        width: 100%;
    }

    select, .btn {
        width: 100%;
    }

    .modal-content {
        width: 95%;
        margin: 10% auto;
        padding: 1.5rem;
    }
}

/* Chart Styles */
canvas#chart {
    width: 100% !important;
    max-height: 400px;
    margin-top: 2rem;
}

/* Button Styles */
.btn-compare {
    width: 100%;
    padding: 0.8rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.btn-compare:hover {
    background-color: var(--secondary-color);
}

.btn-remove {
    width: 100%;
    padding: 0.8rem;
    background-color: var(--danger-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: background-color 0.3s ease;
    margin-top: 1rem;
}

.btn-remove:hover {
    background-color: #d32f2f;
}

.modal-content {
    background: white;
    width: 90%;
    max-width: 800px;
    margin: 5vh auto;
    padding: 2rem;
    border-radius: 1rem;
    position: relative;
    animation: slideIn 0.3s ease-out;
    max-height: 90vh;
    overflow-y: auto;
}

#chart {
    width: 100%;
    height: 400px !important;
    margin-top: 1rem;
}