.banner-container {
    position: relative;
    width: 100%;
    height: 0;
    padding-bottom: 25%; /* This sets the aspect ratio of the container */
    min-height: 150px; /* Slightly taller minimum height to accommodate nav links */
    max-height: 320px; /* Maximum height on large screens */
    overflow: hidden;
    background-color: #1d4ed8; /* bg-blue-700 as fallback */
}

.banner-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.9; /* Make the image slightly transparent */
}

.banner-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 1.5rem;
}

.nav-links {
    display: flex;
    flex-direction: column;
    margin-bottom: 0.75rem;
}

.nav-link {
    color: #bfdbfe; /* text-blue-100 */
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
}

.nav-link:hover {
    color: white;
}

.activity-title {
    font-size: 1.5rem;
    font-weight: bold;
    color: white;
    line-height: 1.2;
}

.activity-date {
    font-size: 0.875rem;
    margin-top: 0.5rem;
    color: #bfdbfe; /* text-blue-100 */
}

/* Medium screens */
@media (min-width: 640px) {
    .banner-overlay {
        padding: 1.5rem 2rem;
    }
    
    .nav-links {
        flex-direction: row;
        align-items: center;
    }
    
    .nav-link {
        font-size: 1rem;
        margin-bottom: 0;
    }
    
    .nav-link:not(:first-child) {
        margin-left: 1rem;
    }
    
    .activity-title {
        font-size: 2rem;
    }
    
    .activity-date {
        font-size: 1rem;
    }
}

/* Large screens */
@media (min-width: 1024px) {
    .banner-overlay {
        padding: 1.5rem 3rem;
    }

    .activity-title {
        font-size: 2.25rem;
    }
}

/* === Activity 1 analysis: metric cards === */
.metric-card {
    background: #fff;
    border: 1px solid #e5e7eb;
    border-radius: 0.625rem;
    overflow: hidden;
    transition: box-shadow 0.15s ease;
}
.metric-card + .metric-card { margin-top: 1rem; }
.metric-card:hover { box-shadow: 0 1px 3px rgba(0,0,0,0.05); }

.metric-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1.25rem;
    border-bottom: 1px solid #f1f5f9;
    background: #fafbfc;
    gap: 0.75rem;
    flex-wrap: wrap;
}
.metric-card-title {
    font-size: 1rem;
    font-weight: 600;
    color: #111827;
    margin: 0;
}
.metric-card-header-left {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    flex-wrap: wrap;
}

.balance-pill {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 500;
    padding: 0.125rem 0.625rem;
    border-radius: 9999px;
    border: 1px solid transparent;
    white-space: nowrap;
}
.balance-pill.blue   { background: #eff6ff; border-color: #bfdbfe; color: #1d4ed8; }
.balance-pill.green  { background: #ecfdf5; border-color: #a7f3d0; color: #047857; }
.balance-pill.yellow { background: #fefce8; border-color: #fde68a; color: #a16207; }
.balance-pill.purple { background: #faf5ff; border-color: #e9d5ff; color: #7e22ce; }

.metric-card-body {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.25rem;
    padding: 1.25rem;
}
@media (min-width: 768px) {
    .metric-card-body {
        grid-template-columns: minmax(0, 220px) minmax(0, 1fr);
    }
}

.input-panel {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    border: 1px solid #e5e7eb;
    border-radius: 0.5rem;
    padding: 1rem;
    background: #f9fafb;
    min-height: 240px;
}
.input-panel-blue   { background: #f8fafc; border-color: #dbeafe; }
.input-panel-green  { background: #f8fafc; border-color: #bbf7d0; }
.input-panel-yellow { background: #fdfdf6; border-color: #fde68a; }
.input-panel-purple { background: #fbfaff; border-color: #e9d5ff; }

.input-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.625rem;
}
.input-field {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}
.input-label {
    font-size: 0.65rem;
    font-weight: 600;
    color: #4b5563;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.input-panel input[type="number"].weight-input,
.input-panel input[type="number"].value-input {
    width: 100%;
    border: 1px solid #d1d5db;
    border-radius: 0.375rem;
    padding: 0.5rem 0.5rem;
    text-align: center;
    font-size: 1rem;
    font-weight: 600;
    color: #111827;
    background: #fff;
    -moz-appearance: textfield;
}
.input-panel input[type="number"].weight-input:focus,
.input-panel input[type="number"].value-input:focus {
    outline: 2px solid #3b82f6;
    outline-offset: -1px;
    border-color: transparent;
}

.weighted-value-row {
    margin-top: auto;
    padding-top: 0.75rem;
    border-top: 1px dashed #d1d5db;
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 0.5rem;
}
.wv-label {
    font-size: 0.7rem;
    color: #6b7280;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 500;
}
.wv-amount {
    font-size: 1.25rem;
    font-weight: 700;
    color: #111827;
    font-variant-numeric: tabular-nums;
}

.chart-area {
    display: flex;
    flex-direction: column;
    gap: 0.625rem;
    min-width: 0;
}
.chart-container {
    position: relative;
    background: #fff;
    border: 1px solid #f1f5f9;
    border-radius: 0.5rem;
    padding: 0.5rem 0.5rem 0.25rem;
}

.expand-chart {
    position: absolute;
    top: 0.375rem;
    right: 0.375rem;
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid #e5e7eb;
    border-radius: 0.375rem;
    padding: 0.25rem;
    z-index: 5;
    color: #6b7280;
    cursor: pointer;
    line-height: 0;
}
.expand-chart:hover { color: #111827; background: #fff; }

.kpi-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}
.kpi {
    display: inline-flex;
    align-items: baseline;
    gap: 0.4rem;
    background: #f9fafb;
    border: 1px solid #e5e7eb;
    border-radius: 0.375rem;
    padding: 0.35rem 0.7rem;
}
.kpi-label {
    font-size: 0.65rem;
    color: #6b7280;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}
.kpi-value {
    font-size: 0.95rem;
    font-weight: 600;
    color: #111827;
    font-variant-numeric: tabular-nums;
}
.kpi-sub {
    font-size: 0.7rem;
    color: #9ca3af;
    margin-left: 0.25rem;
}