:root {
    --primary-color: #000000;
    --secondary-color: #007AFF; /* iOS Blue */
    --success-color: #34C759; /* iOS Green */
    --danger-color: #FF3B30; /* iOS Red */
    --text-color: #1D1D1F;
    --light-text: #86868B;
    --background-color: #F5F5F7; /* Apple Light Gray */
    --card-bg: #FFFFFF;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.04);
    --border-radius: 20px;
    --font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.5;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    background-color: rgba(255, 255, 255, 0.72);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    padding: 1rem 0;
}

.header-content {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 44px;
}

.logo {
    font-size: 1.25rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-color);
}

.last-updated {
    font-size: 0.8rem;
    color: var(--light-text);
    font-weight: 500;
}

main {
    flex: 1;
    padding: 4rem 2rem;
    max-width: 1000px;
    margin: 0 auto;
    width: 100%;
}

.dashboard-title {
    margin-bottom: 2.5rem;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-color);
    text-align: center;
    letter-spacing: -0.02em;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.timestamp-badge {
    font-size: 1rem;
    font-weight: 400;
    color: var(--light-text);
    background: rgba(0, 0, 0, 0.05);
    padding: 4px 12px;
    border-radius: 20px;
}

.rates-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
}

.card {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: 2rem;
    transition: transform 0.3s cubic-bezier(0.25, 0.8, 0.25, 1), box-shadow 0.3s ease;
    border: 1px solid rgba(0, 0, 0, 0.02);
    position: relative;
    overflow: hidden;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.08);
}

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

.card-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--light-text);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.icon {
    font-size: 1.25rem;
    background: #F2F2F7;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

.price-container {
    margin-bottom: 2rem;
    display: flex;
    align-items: baseline;
}

.currency-symbol {
    font-size: 1.5rem;
    color: var(--light-text);
    font-weight: 500;
    margin-right: 4px;
}

.price-value {
    font-size: 4rem;
    font-weight: 700;
    color: var(--text-color);
    line-height: 1;
    letter-spacing: -0.03em;
}

.card.buy .price-value {
    color: var(--success-color);
}

.card.sell .price-value {
    color: var(--danger-color);
}

.merchant-info {
    display: flex;
    align-items: center;
    padding-top: 1.25rem;
    border-top: 1px solid rgba(0, 0, 0, 0.05);
    font-size: 0.9rem;
}

.merchant-label {
    color: var(--light-text);
    margin-right: 0.5rem;
}

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

.badge {
    background-color: #F2F2F7;
    color: var(--secondary-color);
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-left: auto;
}

footer {
    text-align: center;
    padding: 2rem;
    color: var(--light-text);
    font-size: 0.8rem;
    background-color: transparent;
    border-top: none;
}

@media (max-width: 600px) {
    .dashboard-title {
        font-size: 2rem;
        text-align: left;
    }
    
    .price-value {
        font-size: 3rem;
    }

    main {
        padding: 2rem 1.5rem;
    }

    .header-content {
        padding: 0 1.5rem;
    }
}

/* History Table Styles */
.history-section {
    margin-top: 4rem;
}

.section-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--text-color);
    text-align: center;
}

.table-container {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow-x: auto;
    border: 1px solid rgba(0, 0, 0, 0.02);
}

.history-grid-container {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    border: 1px solid rgba(0, 0, 0, 0.02);
    overflow: hidden;
}

.history-header, .history-row {
    display: grid;
    grid-template-columns: 1.2fr 1fr 1fr 1.5fr 1.5fr;
    padding: 1rem 1.5rem;
    align-items: center;
    gap: 1rem;
}

.history-header {
    background-color: #F9F9FB;
    font-weight: 600;
    color: var(--light-text);
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.history-row {
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    font-size: 0.9rem;
    color: var(--text-color);
}

.history-row:last-child {
    border-bottom: none;
}

.history-row:hover {
    background-color: #F5F5F7;
}

.col-buy {
    color: var(--success-color);
    font-weight: 600;
}

.col-sell {
    color: var(--danger-color);
    font-weight: 600;
}

@media (max-width: 700px) {
    .history-grid-container {
        overflow-x: auto;
    }
    .history-header, .history-row {
        min-width: 600px; /* Force scroll on small screens */
    }
}