:root {
    --bg: #09090b;
    --card: #141417;
    --border: #27272a;
    --text: #fafafa;
    --text-dim: #a1a1aa;
    --accent: #4ade80;
    --neg: #ef4444;
    --box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
}

* {
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
}

body {
    margin: 0;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.5;
}

header {
    padding: 1.5rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(20, 20, 23, 0.8);
    backdrop-filter: blur(12px);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--border);
}

header h1 {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.controls select {
    background: #18181b;
    border: 1px solid var(--border);
    color: var(--text);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-size: 0.875rem;
    cursor: pointer;
    outline: none;
    transition: border-color 0.2s;
}

.controls select:hover {
    border-color: #3f3f46;
}

main {
    padding: 2rem;
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.currency-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--box-shadow);
}

.card-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.5rem;
    background: linear-gradient(to right, rgba(255, 255, 255, 0.02), transparent);
}

.card-header h2 {
    margin: 0;
    font-size: 1.5rem;
    letter-spacing: -0.025em;
}

.summary-pills {
    display: flex;
    gap: 1.5rem;
}

.pill {
    display: flex;
    flex-direction: column;
}

.pill span {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.pill strong {
    font-size: 1.125rem;
    font-weight: 600;
}

.pill strong.pos {
    color: var(--accent);
}

.pill strong.neg {
    color: var(--neg);
}

.charts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 0;
}

.chart-box {
    padding: 1.5rem;
    border: 1px solid var(--border);
    border-top: none;
    border-left: none;
}

.chart-box:nth-child(even) {
    border-right: none;
}

.chart-box h3 {
    margin: 0 0 1rem 0;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-dim);
}

.canvas-wrapper {
    height: 240px;
    position: relative;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg);
}

::-webkit-scrollbar-thumb {
    background: #27272a;
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: #3f3f46;
}

@media (max-width: 900px) {
    .charts-grid {
        grid-template-columns: 1fr;
    }

    .chart-box {
        border-right: none;
    }
}

@media (max-width: 640px) {
    header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1.25rem;
        padding: 1.25rem 1rem;
    }

    header h1 {
        font-size: 1.4rem;
    }

    main {
        padding: 1rem;
        gap: 2rem;
    }

    .card-header {
        padding: 1.25rem;
        flex-direction: column;
        align-items: flex-start;
        gap: 1.5rem;
    }

    .card-header h2 {
        font-size: 1.75rem;
    }

    .summary-pills {
        width: 100%;
        overflow-x: auto;
        padding: 0.5rem 0 1rem 0;
        gap: 1.75rem;
        -ms-overflow-style: none;
        scrollbar-width: none;
    }

    .pill strong {
        font-size: 1.25rem;
    }

    .chart-box {
        padding: 1.25rem;
    }

    .canvas-wrapper {
        height: 280px;
    }

    #history-section {
        padding: 1rem;
    }

    .filters {
        width: 100%;
        gap: 0.5rem;
    }

    .filters input,
    .filters select,
    .filters button {
        flex: 1;
        min-width: 120px;
        padding: 0.75rem;
        font-size: 1rem;
    }

    .filters button {
        flex: 1 1 100%;
        margin-top: 0.5rem;
    }
}

/* --- History & Filters Styling --- */

#history-section {
    padding: 0 2rem 2rem 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.filters {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.filters input,
.filters select,
.filters button {
    background: #18181b;
    border: 1px solid var(--border);
    color: var(--text);
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
    font-size: 0.875rem;
    outline: none;
}

.filters button {
    background: var(--accent);
    color: #000;
    font-weight: 600;
    cursor: pointer;
    border: none;
}

.table-container {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow-x: auto;
    box-shadow: var(--box-shadow);
}

table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 0.875rem;
}

th {
    background: rgba(255, 255, 255, 0.02);
    padding: 1rem;
    font-weight: 600;
    color: var(--text-dim);
    border-bottom: 1px solid var(--border);
    cursor: pointer;
    white-space: nowrap;
}

th:hover {
    color: var(--text);
}

td {
    padding: 1rem;
    border-bottom: 1px solid var(--border);
    color: var(--text-dim);
}

tr:hover td {
    background: rgba(255, 255, 255, 0.01);
    color: var(--text);
}

.pagination {
    margin-top: 1.5rem;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
}

.pagination button {
    background: #18181b;
    border: 1px solid var(--border);
    color: var(--text);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
}

.pagination button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}