:root {
    --bg-color: #f8fafc;
    --text-color: #1e293b;
    --card-bg: rgba(255, 255, 255, 0.9);
    --card-border: rgba(148, 163, 184, 0.3);
    --accent-color: #0284c7;
    /* Darker blue */
    --secondary-accent: #4f46e5;
    /* Darker indigo */
    --glass-highlight: rgba(255, 255, 255, 0.8);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

.background-glob {
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at center, rgba(56, 189, 248, 0.1) 0%, rgba(255, 255, 255, 0) 50%);
    z-index: -1;
    pointer-events: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

header {
    text-align: center;
    margin-bottom: 3rem;
    padding-top: 2rem;
}

.site-logo {
    max-width: 700px;
    height: auto;
    margin-bottom: 2rem;
    display: inline-block;
    /* Removed white bg since page is white */
}

h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--accent-color), var(--secondary-accent));
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    color: #64748b;
    font-size: 1.1rem;
    margin-bottom: 2rem;
}

.search-bar {
    position: relative;
    max-width: 600px;
    margin: 0 auto;
}

.search-bar input {
    width: 100%;
    padding: 1rem 1.5rem;
    padding-right: 3rem;
    background: white;
    border: 1px solid var(--card-border);
    border-radius: 9999px;
    color: var(--text-color);
    font-size: 1rem;
    outline: none;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

.search-bar input:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 4px rgba(56, 189, 248, 0.1);
}

.search-bar .search-icon {
    position: absolute;
    right: 1.2rem;
    top: 50%;
    transform: translateY(-50%);
    color: #94a3b8;
    pointer-events: none;
}

/* Filters */
.filters-container {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 1.5rem;
    flex-wrap: wrap;
}

.filter-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.filter-group label {
    font-size: 0.8rem;
    color: #64748b;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.range-inputs {
    display: flex;
    gap: 0.5rem;
}

.range-inputs input {
    width: 80px;
    padding: 0.5rem;
    background: white;
    border: 1px solid var(--card-border);
    border-radius: 0.5rem;
    color: var(--text-color);
    font-size: 0.9rem;
    outline: none;
    text-align: center;
    transition: all 0.3s ease;
}

.range-inputs input:focus {
    border-color: var(--accent-color);
}

select {
    padding: 0.5rem;
    background: white;
    border: 1px solid var(--card-border);
    border-radius: 0.5rem;
    color: var(--text-color);
    font-size: 0.9rem;
    outline: none;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 150px;
}

select:focus {
    border-color: var(--accent-color);
}

.reset-btn {
    align-self: flex-end;
    padding: 0.5rem 1rem;
    background: transparent;
    border: 1px solid var(--secondary-accent);
    color: var(--secondary-accent);
    border-radius: 0.5rem;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    height: 38px;
    /* Match input height roughly */
}

.reset-btn:hover {
    background: var(--secondary-accent);
    color: white;
}

#cardGrid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
    padding-bottom: 4rem;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 1rem;
    overflow: hidden;
    backdrop-filter: blur(12px);
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    display: flex;
    flex-direction: column;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    border-color: var(--accent-color);
}

.card-image {
    width: 100%;
    aspect-ratio: 1;
    background: white;
    /* White bg for clearer molecules */
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    border-bottom: 1px solid var(--card-border);
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    transition: transform 0.3s ease;
}

.card:hover .card-image img {
    transform: scale(1.05);
}

.card-content {
    padding: 1.5rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.card-property {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: #475569;
}

.card-property .label {
    color: #64748b;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.smiles-toggle {
    cursor: pointer;
    color: var(--accent-color);
    font-size: 0.8rem;
    font-weight: 600;
    text-decoration: underline;
    transition: color 0.3s ease;
}

.smiles-toggle:hover {
    color: var(--secondary-accent);
}

.smiles-text {
    font-family: 'Courier New', monospace;
    font-size: 0.75rem;
    /* Slightly smaller for long strings */
    color: var(--secondary-accent);
    word-break: break-all;
    white-space: normal;
    display: block;
    margin-top: 0.25rem;
    line-height: 1.2;
}

.tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    background-color: rgba(56, 189, 248, 0.1);
    color: var(--accent-color);
    margin-top: auto;
    align-self: flex-start;
}

.download-btn {
    display: block;
    width: 100%;
    padding: 0.5rem;
    text-align: center;
    background: rgba(56, 189, 248, 0.2);
    color: var(--accent-color);
    text-decoration: none;
    border-radius: 0.5rem;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.download-btn:hover {
    background: var(--accent-color);
    color: var(--bg-color);
}

.analytics-btn {
    padding: 0.5rem 1rem;
    background: rgba(56, 189, 248, 0.1);
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
    border-radius: 0.5rem;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    height: 38px;
}

.analytics-btn:hover {
    background: var(--accent-color);
    color: var(--bg-color);
}

.analytics-content {
    background-color: white;
    /* reset to solid for charts visibility */
    max-width: 1000px;
    width: 90%;
}

.charts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.chart-container {
    background: white;
    border: 1px solid var(--card-border);
    border-radius: 1rem;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.chart-container h3 {
    margin-bottom: 1rem;
    font-size: 1rem;
    color: #64748b;
}

footer {
    text-align: center;
    color: #64748b;
    margin-top: auto;
    padding: 2rem 0;
    border-top: 1px solid var(--card-border);
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 100;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.5);
    /* lighter backdrop */
    backdrop-filter: blur(5px);
}

.modal-content {
    background-color: #f8fafc;
    margin: 5% auto;
    padding: 2rem;
    border: 1px solid #e2e8f0;
    width: 80%;
    max-width: 800px;
    border-radius: 1rem;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    color: var(--text-color);
    position: relative;
}

.close-button {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}

.close-button:hover,
.close-button:focus {
    color: white;
    text-decoration: none;
    cursor: pointer;
}

@media (max-width: 600px) {
    h1 {
        font-size: 2rem;
    }

    .container {
        padding: 1rem;
    }

    #cardGrid {
        grid-template-columns: 1fr;
    }
}