/* --- Base Styles & Uniform Typography --- */
@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@600;700;800&family=Open+Sans:wght@400;500;600&display=swap');

:root {
    --chec-maroon: #7E0101;
    --chec-dark-maroon: #2D0C0C;
    --chec-bg-light: #F8FAFC;
    --chec-border: #DBD8D8;
    --chec-text-dark: #2E2E2E;
    --chec-platinum: #DBD8D8;
}

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

body {
    font-family: 'Open Sans', sans-serif;
    background-color: var(--chec-bg-light);
    color: var(--chec-text-dark);
    line-height: 1.6;
    /* Consistent "Chemical Haze" Background */
    background-image: 
        radial-gradient(circle at 0% 0%, rgba(195, 181, 167, 0.2) 0%, transparent 50%),
        radial-gradient(circle at 90% 10%, rgba(126, 1, 1, 0.05) 0%, transparent 40%);
    background-attachment: fixed;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 4rem 2rem;
}

/* --- Uniform Header --- */
.main-header {
    text-align: center;
    margin-bottom: 4rem;
}

.title {
    font-family: 'Montserrat', sans-serif;
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--chec-maroon);
    text-transform: uppercase;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
}

.subtitle {
    font-size: 1.1rem;
    color: #64748b;
    max-width: 50rem;
    margin: 0 auto;
    font-weight: 500;
}

/* --- Research Area Cards (Clickable Pills) --- */
.research-section {
    margin-bottom: 4rem;
}

.section-title {
    font-family: 'Montserrat', sans-serif;
    text-align: center;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--chec-dark-maroon);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.section-hint {
    text-align: center;
    font-size: 0.9rem;
    color: #94a3b8;
    margin-bottom: 1.5rem;
}

.horizontal-scroll {
    display: flex;
    gap: 0.75rem;
    padding: 1.5rem 0;
    overflow-x: auto;
    flex-wrap: wrap;
    justify-content: center;
}

.research-card {
    flex-shrink: 0;
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    background-color: white;
    color: var(--chec-text-dark);
    border: 1.5px solid var(--chec-border);
    font-weight: 700;
    font-size: 0.8rem;
    text-transform: uppercase;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
    text-decoration: none;
    display: inline-block;
}

.research-card:hover {
    border-color: var(--chec-maroon);
    color: var(--chec-maroon);
    transform: translateY(-2px);
    box-shadow: 0 8px 15px -3px rgba(126, 1, 1, 0.15);
}

.research-card.active {
    background-color: var(--chec-maroon);
    color: #FFFFFF;
    border-color: var(--chec-maroon);
    box-shadow: 0 10px 15px -3px rgba(126, 1, 1, 0.3);
}

/* --- Matrix Table Styling --- */
.table-responsive-wrapper {
    width: 100%;
    overflow-x: auto;
    border-radius: 2rem;
    border: 1.5px solid var(--chec-border);
    background-color: white;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.05);
    position: relative;
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
}

.faculty-table {
    min-width: 100%;
    border-collapse: collapse;
}

.faculty-table th {
    background-color: white;
    padding: 1.5rem;
    text-align: center;
    font-family: 'Montserrat', sans-serif;
    font-size: 0.75rem;
    font-weight: 800;
    color: var(--chec-dark-maroon);
    border-bottom: 2px solid var(--chec-bg-light);
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.faculty-table th:first-child {
    text-align: left;
    border-right: 2px solid var(--chec-bg-light);
}

.faculty-table td {
    padding: 1.25rem 1.5rem;
    font-size: 0.9rem;
    border-bottom: 1px solid var(--chec-bg-light);
}

/* --- Stable Vertical Band (Professor Names) --- */
.faculty-table td:first-child, 
.faculty-table th:first-child {
    position: sticky;
    left: 0;
    z-index: 40;
    background-color: #FFFFFF;
    border-right: 2px solid var(--chec-border);
    box-shadow: 4px 0 8px -2px rgba(0,0,0,0.05);
}

.faculty-table th:first-child {
    top: 0;
    z-index: 50;
    background-color: var(--chec-bg-light);
}

.faculty-table td:not(:first-child) {
    z-index: 10;
    position: relative;
}

.table-row:hover {
    background-color: #fef2f2;
}

.faculty-name-cell {
    font-family: 'Montserrat', sans-serif;
    font-weight: 700;
    color: var(--chec-maroon);
    background-color: white !important;
    border-right: 2px solid var(--chec-bg-light);
}

/* --- Clickable Column Headers --- */
.faculty-table th.clickable-header {
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
}

.faculty-table th.clickable-header:hover {
    background-color: rgba(126, 1, 1, 0.05);
    color: var(--chec-maroon);
}

.faculty-table th.clickable-header::after {
    content: '→';
    position: absolute;
    right: 0.5rem;
    top: 50%;
    transform: translateY(-50%);
    opacity: 0;
    transition: opacity 0.2s ease;
    font-size: 0.9rem;
}

.faculty-table th.clickable-header:hover::after {
    opacity: 1;
}

/* --- Light Rectangular Status Indicators --- */
.status-cell {
    text-align: center;
    padding: 0.85rem !important;
    vertical-align: middle;
}

.icon-check {
    width: 2.2rem;
    height: 1.1rem;
    margin: 0 auto;
    border-radius: 3px;
    background-color: rgba(126, 1, 1, 0.15);
    border: 1.5px solid var(--chec-maroon);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease-in-out;
}

.icon-check:hover {
    background-color: var(--chec-maroon);
    transform: scale(1.1);
}

.svg-icon {
    width: 0.85rem;
    height: 0.85rem;
    color: var(--chec-maroon);
    transition: color 0.2s ease;
}

.icon-check:hover .svg-icon {
    color: #FFFFFF;
}

.icon-empty {
    width: 2.2rem;
    height: 1.1rem;
    margin: 0 auto;
    border-radius: 3px;
    background-color: transparent;
    border: 1px solid #e2e8f0;
}

/* Highlight for the Search Filter */
.highlight-col {
    background-color: rgba(126, 1, 1, 0.08) !important;
    border-left: 1px solid rgba(126, 1, 1, 0.1);
    border-right: 1px solid rgba(126, 1, 1, 0.1);
}

/* Scrollbar Styling */
.horizontal-scroll::-webkit-scrollbar {
    height: 6px;
}
.horizontal-scroll::-webkit-scrollbar-track {
    background: var(--chec-bg-light);
}
.horizontal-scroll::-webkit-scrollbar-thumb {
    background: var(--chec-platinum);
    border-radius: 10px;
}

.faculty-table td, 
.faculty-table th {
    transition: background-color 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.faculty-link {
    text-decoration: none;
    color: inherit;
}

.faculty-link:hover {
    color: #7e0101;
    text-decoration: underline;
}

/* Footer */
.footer {
    text-align: center;
    padding: 2rem 0;
    margin-top: 4rem;
    border-top: 2px solid var(--chec-border);
    color: var(--chec-dark-maroon);
    font-weight: 600;
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 2rem 1rem;
    }
    
    .title {
        font-size: 1.8rem;
    }
    
    .horizontal-scroll {
        flex-wrap: nowrap;
        justify-content: flex-start;
    }
}