:root {
    --primary-color: #6366f1;
    /* Modern Indigo */
    --primary-hover: #4f46e5;
    --bg-light: #f8fafc;
    /* Slate light */
    --text-dark: #0f172a;
    /* Deep Slate */
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --card-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --card-shadow-hover: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
}

body {
    font-family: 'Plus Jakarta Sans', sans-serif;
    background-color: var(--bg-light);
    color: var(--text-dark);
    letter-spacing: -0.02em;
}

.navbar {
    background-color: rgba(255, 255, 255, 0.8) !important;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.04em;
}

.nav-link {
    font-weight: 500;
    color: var(--text-muted);
    padding: 0.5rem 0.75rem;
    transition: all 0.2s;
    position: relative;
}

.nav-link:hover {
    color: var(--primary-color);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0.75rem;
    right: 0.75rem;
    height: 2px;
    background-color: var(--primary-color);
    border-radius: 2px;
    transform: scaleX(0);
    transition: transform 0.2s ease;
}

.nav-link.active {
    color: var(--primary-color) !important;
}

.nav-link.active::after,
.nav-link:hover::after {
    transform: scaleX(1);
}

.sponsor-banner {
    background: linear-gradient(135deg, #ffffff 0%, #f1f5f9 100%);
    border: 1px solid var(--border-color);
    border-radius: 1.25rem;
    padding: 2.5rem;
    text-align: center;
}

.sponsor-logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: #1a1a1a;
    margin-bottom: 0.5rem;
    display: inline-block;
}

.sponsor-logo span {
    color: var(--primary-color);
}

.card {
    border-radius: 1.25rem;
    border: 1px solid var(--border-color);
    box-shadow: var(--card-shadow);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.card:hover {
    box-shadow: var(--card-shadow-hover) !important;
    transform: translateY(-2px);
}

.form-control,
.form-select {
    border-radius: 0.75rem;
    padding: 0.75rem 1rem;
    font-weight: 500;
}

.form-control:focus,
.form-select:focus {
    box-shadow: 0 0 0 0.25rem rgba(99, 102, 241, 0.15);
    border-color: var(--primary-color);
}

.table thead th {
    font-size: 0.8rem;
    text-transform: uppercase;
    font-weight: 600;
    color: #6c757d;
    border-bottom: none;
    padding: 1rem;
}

.table tbody tr {
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.table tbody tr:hover {
    background-color: rgba(99, 102, 241, 0.05);
}

.table tbody td {
    padding: 1.25rem 1rem;
    font-weight: 500;
    border-bottom: 1px solid var(--border-color);
}

.currency-icon {
    width: 32px;
    height: 32px;
    background: #f1f5f9;
    border-radius: 0.5rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-right: 12px;
    font-weight: 700;
    font-size: 0.75rem;
    color: var(--primary-color);
}

.trend-up {
    color: #059669;
    /* Emerald 600 */
}

.trend-down {
    color: #e11d48;
    /* Rose 600 */
}

#conversion-result {
    letter-spacing: -0.02em;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

main {
    animation: fadeIn 0.6s ease-out;
}

.segmented-toggle {
    background-color: #f1f5f9;
    padding: 0.25rem;
    border-radius: 0.75rem;
    border: none;
}

.segmented-toggle .btn-check+.btn {
    border-radius: 0.6rem !important;
    border: none !important;
    color: var(--text-muted);
    font-size: 0.875rem;
    transition: all 0.2s ease;
}

/* Best Rates Section */
#best-rates-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%) !important;
}

.segmented-toggle .btn-check:checked+.btn {
    background-color: #ffffff !important;
    color: var(--primary-color) !important;
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
}

.segmented-toggle .btn-check:focus+.btn {
    box-shadow: none !important;
}

.timeframe-toggle .btn {
    padding-left: 1.25rem !important;
    padding-right: 1.25rem !important;
    font-size: 0.75rem !important;
    font-weight: 700 !important;
}

#historyChart {
    width: 100% !important;
}

.chart-column {
    width: 60px;
    padding: 0 !important;
    text-align: center;
}

.chart-btn {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    color: var(--text-muted);
    transition: all 0.2s ease;
    padding: 1.25rem 0;
    /* Match row vertical padding */
}

.chart-column:hover {
    background-color: rgba(99, 102, 241, 0.1) !important;
}

.chart-column:hover .chart-btn {
    color: var(--primary-color);
}

.chart-btn svg {
    opacity: 0.6;
    transition: transform 0.2s ease, opacity 0.2s ease;
}

.chart-column:hover svg {
    opacity: 1;
    transform: scale(1.1);
}

@media (max-width: 767.98px) {
    .card-header {
        padding: 1.5rem !important;
    }

    .card-header h2 {
        font-size: 1.1rem;
    }

    .table thead th {
        padding: 0.75rem 0.5rem;
        font-size: 0.7rem;
    }

    .table tbody td {
        padding: 1rem 0.5rem;
    }

    /* Hide currency full name on mobile to save space */
    .currency-name-subtext {
        display: none;
    }

    .base-currency-label {
        font-size: 0.7rem;
    }
}

@media (max-width: 991.98px) {
    .container {
        padding-left: 20px;
        padding-right: 20px;
    }
}