:root {
    --primary: #FF9900;
    --primary-dark: #EC7211;
    --background: #0f1419;
    --card-bg: #1a1f29;
    --card-hover: #232936;
    --text: #e6e6e6;
    --text-muted: #9ca3af;
    --border: #374151;

    /* Domain tag colors - 17 unique, visually distinct colors */
    --tag-ai: #3b82f6;              /* Blue */
    --tag-medical: #ec4899;          /* Pink */
    --tag-education: #f59e0b;        /* Amber/Orange */
    --tag-genomics: #10b981;         /* Emerald Green */
    --tag-climate: #14b8a6;          /* Teal */
    --tag-computer-science: #06b6d4; /* Cyan */
    --tag-chemistry: #a855f7;        /* Purple */
    --tag-neuroscience: #e11d48;     /* Rose/Red */
    --tag-conservation: #84cc16;     /* Lime Green */
    --tag-astronomy: #8b5cf6;        /* Violet */
    --tag-robotics: #f97316;         /* Orange */
    --tag-hpc: #6366f1;              /* Indigo */
    --tag-physics: #db2777;          /* Pink-Purple */
    --tag-quantum: #0ea5e9;          /* Sky Blue */
    --tag-cultural: #d97706;         /* Amber */
    --tag-economics: #059669;        /* Green */
    --tag-other: #6b7280;            /* Gray */
}

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

/* Screen reader only content */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--background);
    color: var(--text);
    line-height: 1.6;
}

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

/* Header */
header {
    padding: 3rem 0 2rem;
    border-bottom: 1px solid var(--border);
    margin-bottom: 2rem;
}

header h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.bracket {
    color: var(--text-muted);
}

.comma {
    color: var(--primary);
}

.tagline {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.subtitle {
    font-size: 0.95rem;
    color: var(--text-muted);
}

/* Controls */
.controls {
    margin-bottom: 2rem;
}

.search-box {
    margin-bottom: 1.5rem;
}

#search {
    width: 100%;
    padding: 1rem 1.5rem;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-size: 1rem;
    transition: border-color 0.2s;
}

#search:focus {
    outline: none;
    border-color: var(--primary);
}

#search::placeholder {
    color: var(--text-muted);
}

.filters {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 1rem;
}

.sort-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    padding: 1rem;
    background: var(--card-bg);
    border-radius: 8px;
    border: 1px solid var(--border);
}

.sort-controls label {
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 500;
    margin-right: 0.5rem;
}

.sort-btn {
    padding: 0.5rem 1rem;
    background: transparent;
    border: 1px solid transparent;
    border-radius: 6px;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s;
}

.sort-btn:hover {
    color: var(--text);
    background: rgba(255, 153, 0, 0.1);
}

.sort-btn.active {
    color: var(--primary);
    font-weight: 500;
    border-color: var(--primary);
}

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

.filter-group label {
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 500;
    margin-right: 0.5rem;
}

.filter-btn {
    padding: 0.5rem 1rem;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text);
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s;
}

.filter-btn:hover {
    background: var(--card-hover);
    border-color: var(--primary);
}

.filter-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: var(--background);
    font-weight: 500;
}

.action-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

.action-btn {
    padding: 0.75rem 1.5rem;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text);
    cursor: pointer;
    font-size: 0.95rem;
    transition: all 0.2s;
    text-decoration: none;
    display: inline-block;
}

.action-btn:hover {
    background: var(--card-hover);
    transform: translateY(-2px);
}

.contribute-btn {
    background: var(--primary);
    border-color: var(--primary);
    color: var(--background);
    font-weight: 500;
}

.contribute-btn:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
}

.count {
    color: var(--text-muted);
    font-size: 0.9rem;
}

#count {
    color: var(--primary);
    font-weight: 600;
}

/* Grid */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 1.5rem;
    margin-bottom: 4rem;
}

/* Cards */
.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.card:hover {
    background: var(--card-hover);
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.3);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.institution {
    font-weight: 600;
    color: var(--text);
    font-size: 1.1rem;
    flex: 1;
}

.year-badge {
    background: var(--primary);
    color: var(--background);
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.85rem;
    font-weight: 600;
    flex-shrink: 0;
    margin-left: 0.5rem;
}

.project-title {
    font-size: 1rem;
    color: var(--text);
    margin-bottom: 1rem;
    line-height: 1.4;
    font-weight: 500;
    margin-top: 0;
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.tag {
    padding: 0.25rem 0.75rem;
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 500;
}

.tag-ai { background: var(--tag-ai); color: white; }
.tag-medical { background: var(--tag-medical); color: white; }
.tag-education { background: var(--tag-education); color: white; }
.tag-genomics { background: var(--tag-genomics); color: white; }
.tag-climate { background: var(--tag-climate); color: white; }
.tag-computer-science { background: var(--tag-computer-science); color: white; }
.tag-chemistry { background: var(--tag-chemistry); color: white; }
.tag-neuroscience { background: var(--tag-neuroscience); color: white; }
.tag-conservation { background: var(--tag-conservation); color: white; }
.tag-astronomy { background: var(--tag-astronomy); color: white; }
.tag-robotics { background: var(--tag-robotics); color: white; }
.tag-hpc { background: var(--tag-hpc); color: white; }
.tag-physics { background: var(--tag-physics); color: white; }
.tag-quantum { background: var(--tag-quantum); color: white; }
.tag-cultural { background: var(--tag-cultural); color: white; }
.tag-economics { background: var(--tag-economics); color: white; }
.tag-other { background: var(--tag-other); color: white; }
.tag-default { background: var(--tag-other); color: white; }

.achievement {
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.5;
    margin-top: auto;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Footer */
footer {
    border-top: 1px solid var(--border);
    padding: 3rem 0;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}

footer a {
    color: var(--primary);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }

    header h1 {
        font-size: 2rem;
    }

    .grid {
        grid-template-columns: 1fr;
    }

    .filter-group {
        flex-direction: column;
        align-items: flex-start;
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.card {
    animation: fadeIn 0.5s ease-out;
}