body {
    font-family: 'Roboto', Arial, sans-serif;
    background: linear-gradient(135deg, #e0e7ff 0%, #f8fafc 100%);
    margin: 0;
    padding: 0;
    min-height: 100vh;
    color: #2d3a4a;
}

.container {
    background: #fff;
    border-radius: 18px;
    box-shadow: 0 6px 32px rgba(0,0,0,0.09);
    padding: 2.5rem 2rem 2rem 2rem;
    max-width: 420px;
    margin: 40px auto;
}

h1 {
    text-align: center;
    color: #2563eb;
    margin-bottom: 0.5rem;
    font-weight: 700;
    letter-spacing: 1px;
    font-size: 2rem;
}

h1 .fa-money-bill-wave {
    color: #38bdf8;
    margin-right: 0.5rem;
}

.tagline {
    text-align: center;
    color: #64748b;
    margin-bottom: 1.5rem;
    font-size: 1.05rem;
}

.rate-card {
    background: linear-gradient(90deg, #2563eb 0%, #38bdf8 100%);
    border-radius: 14px;
    padding: 1.5rem 1rem;
    box-shadow: 0 2px 12px rgba(37,99,235,0.07);
    text-align: center;
    margin-bottom: 1.5rem;
    color: #fff;
    position: relative;
}

.rate-card .rate-icon {
    font-size: 2.2rem;
    margin-bottom: 0.5rem;
    color: #fff;
}

.rate-card .label {
    font-size: 1.1rem;
    margin-bottom: 0.3rem;
    letter-spacing: 0.5px;
}

.rate-card .rate-value {
    font-size: 2.3rem;
    font-weight: 700;
    margin: 0.2rem 0 0.5rem 0;
    letter-spacing: 1px;
}

.rate-card .date-time {
    font-size: 0.98rem;
    color: #e0e7ef;
}

.info-section {
    text-align: center;
    margin-bottom: 1.2rem;
}

.info-section p {
    color: #475569;
    font-size: 0.98rem;
    margin-bottom: 0.7rem;
}

.info-section .fa-circle-info {
    color: #2563eb;
    margin-right: 0.4em;
}

#refreshButton {
    background: #2563eb;
    color: #fff;
    border: none;
    border-radius: 8px;
    padding: 0.6rem 1.3rem;
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.2s;
    box-shadow: 0 2px 8px rgba(37,99,235,0.08);
}

#refreshButton:hover {
    background: #1e40af;
}

#refreshButton .fa-arrows-rotate {
    margin-right: 0.5em;
}

.divider {
    border: none;
    border-top: 1.5px solid #e5e7eb;
    margin: 2rem 0 1.5rem 0;
}

.date-search-section {
    text-align: center;
}

.date-search-section h2 {
    font-size: 1.15rem;
    color: #2563eb;
    margin-bottom: 1rem;
    font-weight: 700;
}

.date-search-section .fa-calendar-day {
    margin-right: 0.4em;
    color: #38bdf8;
}

.input-group {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.7rem;
    margin-bottom: 1rem;
}

.input-group label {
    font-size: 1rem;
    color: #475569;
    display: flex;
    align-items: center;
    gap: 0.4em;
}

.input-group .fa-calendar {
    color: #2563eb;
}

#dateInput {
    padding: 0.4rem 0.7rem;
    border-radius: 6px;
    border: 1px solid #cbd5e1;
    font-size: 1rem;
}

#searchDateButton {
    background: #38bdf8;
    color: #fff;
    border: none;
    border-radius: 8px;
    padding: 0.5rem 1.2rem;
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.2s;
    margin-bottom: 0.5rem;
}

#searchDateButton:hover {
    background: #0ea5e9;
}

#searchDateButton .fa-magnifying-glass {
    margin-right: 0.5em;
}

.error-message {
    color: #ef4444;
    background: #fef2f2;
    border-radius: 7px;
    padding: 0.7rem 1rem;
    margin-top: 1.2rem;
    font-size: 1rem;
    display: none;
}

@media (max-width: 500px) {
    .container {
        padding: 1.2rem 0.5rem;
    }
    .rate-card {
        padding: 1rem 0.5rem;
    }
}