/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
    margin: 0;
    padding: 0;
    --bg-color: #ffc70a; /* CSS variable for background color */
}

/* Layout variables for alignment */
:root {
    --arrow-size: 48px;
    --container-gap: 16px;
    --fade-width: 60px;
}

/* When embedded in iframe, ensure no extra spacing */
body.iframe-embedded {
    background: transparent;
    overflow: hidden;
    --bg-color: rgba(255, 255, 255, 0.9); /* Use white with opacity for iframe embedding */
}

.container {
    max-width: 100%;
    margin: 0 auto;
}

/* Iframe-friendly container with minimal padding */
.container.iframe-mode {
    max-width: none;
    margin: 0;
    padding: 10px;
}

/* Buttons */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    display: inline-block;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background: #5a6268;
    transform: translateY(-1px);
}

/* Loading spinner */
.loading {
    text-align: center;
    padding: 40px;
    background: white;
    border-radius: 12px;
    margin-bottom: 30px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.spinner {
    width: 40px;
    height: 40px;
    margin: 0 auto 20px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Error messages */
.error {
    background: #f8d7da;
    color: #721c24;
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 30px;
    border: 1px solid #f5c6cb;
}


/* Scroll container with arrows */
.scroll-container {
    position: relative;
    display: flex;
    align-items: center;
    gap: var(--container-gap);
}

/* Gradient fade overlays for smooth edge transitions */
.scroll-container::before,
.scroll-container::after {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    width: var(--fade-width);
    z-index: 10;
    pointer-events: none;
}

/* Disable edge fades when requested */
body.no-edge-fade .scroll-container::before,
body.no-edge-fade .scroll-container::after {
    display: none;
}

.scroll-container::before {
    left: calc(var(--arrow-size) + var(--container-gap)); /* align exactly with data container edge */
    background: transparent;
    box-shadow: inset 40px 0 40px -20px var(--bg-color, rgba(248, 249, 250, 0.9));
}

.scroll-container::after {
    right: calc(var(--arrow-size) + var(--container-gap)); /* align exactly with data container edge */
    background: transparent;
    box-shadow: inset -40px 0 40px -20px var(--bg-color, rgba(248, 249, 250, 0.9));
}

.scroll-arrow {
    background: white;
    border: 2px solid #e1e5e9;
    border-radius: 50%;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    font-weight: bold;
    color: #00205b;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    flex-shrink: 0;
    z-index: 10;
    font-family: monospace; /* Ensures consistent character spacing */
    line-height: 1;
    padding: 0;
    margin: 0;
}

.scroll-arrow:hover {
    background: #00205b;
    color: white;
    transform: scale(1.05);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.scroll-arrow:active {
    transform: scale(0.95);
}

.scroll-arrow:disabled {
    opacity: 0.3;
    cursor: default;
    background: #f8f9fa;
    color: #6c757d;
    border-color: #e9ecef;
}

.scroll-arrow:disabled:hover {
    transform: none;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

/* Data container - unified horizontal scrolling layout */
.data-container {
    display: flex;
    flex-direction: column; /* vertical stack of rows */
    gap: 8px; /* vertical gap between rows */
    padding: 12px 20px;
    overflow-x: auto;
    overflow-y: hidden;
    scroll-behavior: smooth;
    flex: 1;
    
    /* Hide scrollbars */
    scrollbar-width: none; /* Firefox */
    -ms-overflow-style: none; /* Internet Explorer 10+ */
    
    /* Performance optimizations for smooth scrolling */
    will-change: scroll-position;
    transform: translateZ(0); /* Force hardware acceleration */
    -webkit-overflow-scrolling: touch; /* Smooth scrolling on iOS */
    contain: layout style paint; /* CSS containment for better performance */
}

/* Hide scrollbars for WebKit browsers */
.data-container::-webkit-scrollbar {
    display: none;
}

.data-row {
    display: inline-flex; /* keep rows inline so container scrolls horizontally */
    gap: 8px; /* horizontal space between cards */
    align-items: stretch;
}

.data-item {
    flex: 0 0 auto; /* keep natural content width; do not stretch */
    width: auto; /* overridden inline when fixedCardWidth is set */
    min-width: 100px; /* Prevent cards from getting too narrow */
    max-width: 275px; /* Cap maximum width by default */
    background: rgba(255, 255, 255, 0.75);
    border-radius: 6px;
    padding: 12px;
    transition: all 0.2s ease;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
    
    /* Prevent text selection and keep arrow cursor */
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    cursor: default;
}

.data-item:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.data-item .name {
    font-size: 1rem;
    font-weight: 600;
    color: #2d3748;
    line-height: 1.2;
    margin-bottom: 3px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.data-item .affiliation {
    color: #718096;
    font-size: 0.9rem;
    line-height: 1.2;
    font-weight: 400;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.no-data {
    text-align: center;
    color: #6c757d;
    font-style: italic;
    padding: 40px;
    width: 100%;
}

/* Last updated footer */
.last-updated {
    margin-top: 16px;
    margin-left: 64px; /* Align with data container (after left arrow) */
    padding: 0 20px;
    font-size: 0.85rem;
    color: #6c757d;
    text-align: left;
    font-style: italic;
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 12px;
    }
    
    .scroll-container {
        gap: var(--container-gap);
    }
    :root {
        --arrow-size: 40px;
        --container-gap: 12px;
        --fade-width: 50px;
    }
    
    .scroll-arrow {
        width: 40px;
        height: 40px;
        font-size: 24px;
    }
    
    .data-container {
        gap: 8px;
        padding: 12px 20px;
    }
    
    .data-item {
        width: max-content; /* Fit to content on mobile too */
        min-width: 100px;
        max-width: 275px;
        padding: 12px;
    }
    
    .last-updated {
        margin-left: 52px; /* Align with smaller arrows on mobile */
        padding: 0 12px;
        font-size: 0.8rem;
    }
}

/* Very narrow screens (below 400px) */
@media (max-width: 400px) {
    .container {
        padding: 8px;
    }
    
    .scroll-container {
        gap: var(--container-gap);
    }
    :root {
        --arrow-size: 32px;
        --container-gap: 8px;
        --fade-width: 40px;
    }
    
    .scroll-arrow {
        width: 32px;
        height: 32px;
        font-size: 18px;
    }
    
    .data-container {
        padding: 12px 20px;
        gap: 8px;
    }
    
    .data-item {
        width: max-content;
        min-width: 100px;
        max-width: 275px;
        padding: 12px;
    }
    
    .last-updated {
        margin-left: 40px; /* Align with smaller arrows on narrow screens */
        padding: 0 8px;
        font-size: 0.75rem;
    }
}

/* Extreme narrow screens (below 250px) - emergency fallback */
@media (max-width: 250px) {
    .scroll-container {
        gap: var(--container-gap);
        flex-direction: column; /* Stack arrows vertically if needed */
    }
    :root {
        --arrow-size: 28px;
        --container-gap: 4px;
        --fade-width: 30px;
    }
    
    .scroll-arrow {
        width: 28px;
        height: 28px;
        font-size: 16px;
    }
    
    .data-container {
        padding: 12px 20px;
        gap: 8px;
    }
    
    .data-item {
        width: max-content;
        min-width: 80px;
        max-width: 275px;
        padding: 12px;
    }
    
    .last-updated {
        margin-left: 32px; /* Align with very small arrows */
        padding: 0 4px;
        font-size: 0.7rem;
    }
}

/* Special handling for iframe embedding */
body.iframe-embedded .container {
    padding: 8px !important;
    min-width: 0; /* Allow shrinking */
}

body.iframe-embedded .scroll-container {
    min-width: 0; /* Allow shrinking */
    overflow: hidden; /* Prevent horizontal overflow */
}

/* When arrows are hidden, adjust gradients to cover the full edges */
.scroll-container:has(.scroll-arrow[style*="display: none"])::before,
.scroll-container:has(.scroll-arrow[style*="display: none"])::after {
    width: 60px;
}

.scroll-container:has(.scroll-arrow[style*="display: none"])::before {
    left: 0;
}

.scroll-container:has(.scroll-arrow[style*="display: none"])::after {
    right: 0;
}

/* Fallback for browsers without :has() support when arrows are likely hidden */
body.iframe-embedded .scroll-container::before {
    left: 0;
    /* Use transparent mask-based fade in iframe so parent bg shows through */
    background: none;
    box-shadow: none; /* Remove box-shadow in iframe */
}

body.iframe-embedded .scroll-container::after {
    right: 0;
    /* Use transparent mask-based fade in iframe so parent bg shows through */
    background: none;
    box-shadow: none; /* Remove box-shadow in iframe */
}

body.iframe-embedded .data-container {
    min-width: 0; /* Allow shrinking */
    /* Fade content to transparent at edges so any parent background shows through */
    -webkit-mask-image: linear-gradient(to right, transparent 0, #000 60px, #000 calc(100% - 60px), transparent 100%);
    mask-image: linear-gradient(to right, transparent 0, #000 60px, #000 calc(100% - 60px), transparent 100%);
}

/* Disable mask fade in iframe when requested */
body.no-edge-fade.iframe-embedded .data-container {
    -webkit-mask-image: none;
    mask-image: none;
}