#research-panel {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 10, 10, 0.97);
    z-index: 300;
    display: none;
    flex-direction: column;
    align-items: center;
    padding: var(--space-xl);
    padding-top: calc(var(--top-bar-height) + var(--space-lg));
    box-sizing: border-box;
    color: var(--color-primary);
}

#research-panel.active {
    display: flex;
}

#research-header {
    width: 100%;
    max-width: 1400px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 var(--space-lg);
    margin-bottom: var(--space-lg);
    border-bottom: 1px solid rgba(0, 255, 255, 0.3);
    padding-bottom: var(--space-md);
    position: relative;
}

#research-header h2 {
    font-size: 2em;
    text-shadow: var(--shadow-glow-primary);
    margin: 0;
}

#close-research-panel {
    font-size: 1.5em;
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    cursor: pointer;
    transition: var(--transition-color);
    position: absolute;
    top: 0;
    right: var(--space-lg);
}

#close-research-panel:hover {
    color: var(--color-text-primary);
}

#research-grid {
    display: flex;
    gap: var(--space-xl);
    width: 100%;
    max-width: 1400px;
    overflow-x: auto;
    padding: var(--space-lg);
    box-sizing: border-box;
}

.research-category {
    flex: 1;
    min-width: 350px;
    border: 1px solid var(--color-primary);
    border-radius: var(--border-radius-sm);
    padding: var(--space-md);
    background-color: rgba(0, 25, 25, 0.5);
    box-shadow: inset 0 0 10px rgba(0, 255, 255, 0.1);
}

.research-category h3 {
    text-align: center;
    font-size: 1.5em;
    margin: 0 0 var(--space-md) 0;
    border-bottom: 1px solid rgba(0, 255, 255, 0.2);
    padding-bottom: var(--space-sm);
    color: var(--color-text-primary);
    text-transform: uppercase;
}

.tier-container {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.research-tier {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
}

.research-item {
    width: 100px;
    height: 70px;
    border: 1px solid var(--color-primary);
    border-radius: var(--border-radius-sm);
    padding: var(--space-sm);
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: relative;
    transition: all 0.2s ease;
    background-color: rgba(0, 30, 30, 0.8);
}

.research-name {
    font-size: 0.8em;
    font-weight: bold;
    color: var(--color-text-primary);
}

.research-cost {
    font-size: 0.7em;
    color: var(--color-accent);
    margin-top: var(--space-xs);
}

.research-item.available {
    cursor: pointer;
    border-color: var(--color-secondary);
    box-shadow: 0 0 8px rgba(0, 255, 255, 0.3);
}

.research-item.available:hover {
    background-color: rgba(0, 80, 80, 0.9);
    transform: translateY(-2px);
    box-shadow: 0 0 12px rgba(0, 255, 255, 0.5);
}

.research-item.locked {
    border-color: #666;
    color: var(--color-text-disabled);
    background-color: rgba(30, 30, 30, 0.8);
    opacity: 0.7;
}

.research-item.locked .research-name,
.research-item.locked .research-cost {
    color: var(--color-text-disabled);
}

.research-item.completed {
    background-color: rgba(0, 100, 100, 0.9);
    border-color: var(--color-success);
    cursor: default;
    box-shadow: inset 0 0 10px rgba(0, 255, 255, 0.4);
}

.research-item.completed .research-name {
    color: #fff;
    text-shadow: 0 0 5px #fff;
}

.research-tooltip {
    visibility: hidden;
    width: 180px;
    background-color: #011818;
    color: var(--color-text-secondary);
    text-align: center;
    border-radius: var(--border-radius-sm);
    padding: var(--space-sm);
    position: absolute;
    z-index: 10;
    bottom: 115%;
    left: 50%;
    margin-left: -90px;
    opacity: 0;
    transition: opacity 0.2s;
    border: 1px solid var(--color-secondary);
    font-size: 0.8em;
    pointer-events: none;
}

.research-item:hover .research-tooltip {
    visibility: visible;
    opacity: 1;
}