.upgrade-panel {
    position: fixed;
    right: 0;
    top: 50%;
    transform: translateY(-50%) translateX(100%);
    width: min(280px, 86vw);
    max-height: min(80vh, 100%);
    max-height: min(80dvh, 100%);
    background: var(--bg-panel);
    border: 1px solid var(--glass-border);
    border-right: none;
    border-radius: 10px 0 0 10px;
    z-index: 45;
    pointer-events: auto;
    overscroll-behavior: contain;
    transition: transform 0.3s ease, visibility 0.3s ease;
    visibility: hidden;
    display: flex;
    flex-direction: column;
}

.upgrade-panel.open {
    transform: translateY(-50%) translateX(0);
    visibility: visible;
}

.upgrade-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: clamp(8px, 1.6vh, 14px) clamp(10px, 2.5vw, 16px);
    border-bottom: 1px solid var(--border-color);
    flex: 0 0 auto;
}

.upgrade-header h3 {
    font-size: clamp(11px, min(3.2vw, 1.8vh), 15px);
    letter-spacing: 3px;
    color: var(--primary);
}

.upgrade-close {
    background: none;
    border: none;
    color: var(--text-dim);
    font-size: 22px;
    cursor: pointer;
    padding: 0 6px;
    line-height: 1;
    touch-action: manipulation;
}

.upgrade-close:hover {
    color: var(--danger);
}

.upgrade-list {
    flex: 1;
    overflow-y: auto;
    padding: 8px;
}

.upgrade-list::-webkit-scrollbar {
    width: 4px;
}

.upgrade-list::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 2px;
}

.upgrade-item {
    padding: 10px 12px;
    margin-bottom: 6px;
    background: rgba(255,255,255,0.02);
    border: 1px solid rgba(255,255,255,0.05);
    border-radius: 6px;
    transition: border-color 0.2s;
}

.upgrade-item:hover {
    border-color: var(--glass-border);
}

.upgrade-name {
    font-size: 11px;
    letter-spacing: 2px;
    color: var(--text-dim);
    font-weight: 600;
    margin-bottom: 4px;
}

.upgrade-level {
    font-size: 13px;
    color: var(--primary);
    font-weight: 700;
    margin-bottom: 6px;
}

.upgrade-stat {
    font-size: 10px;
    color: var(--text-dim);
    margin-bottom: 8px;
}

.upgrade-btn {
    width: 100%;
    padding: 7px;
    border: 1px solid var(--glass-border);
    border-radius: 4px;
    background: rgba(0, 180, 255, 0.08);
    color: var(--primary);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 1px;
    cursor: pointer;
    transition: all 0.2s;
}

.upgrade-btn:hover:not(:disabled) {
    background: rgba(0, 180, 255, 0.2);
    border-color: var(--primary);
}

.upgrade-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.upgrade-btn.maxed {
    opacity: 0.4;
    cursor: default;
    color: var(--text-dim);
}

.upgrade-crystals {
    padding: clamp(7px, 1.4vh, 10px) 16px;
    border-top: 1px solid var(--border-color);
    font-size: clamp(10px, min(2.9vw, 1.6vh), 13px);
    letter-spacing: 2px;
    color: var(--crystal-color);
    font-weight: 600;
    text-align: center;
    flex: 0 0 auto;
}

/* Lives inside .hud-banners, so normal flow keeps it between the
   objective and alert banners without any overlap. */
.boss-bar {
    width: min(400px, 78vw);
    max-width: 86%;
    text-align: center;
    pointer-events: none;
}

.boss-name {
    font-size: clamp(10px, min(2.9vw, 1.7vh), 15px);
    letter-spacing: 4px;
    color: var(--danger);
    font-weight: 700;
    margin-bottom: 6px;
    text-shadow: 0 0 10px rgba(255, 50, 80, 0.5);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.boss-health-bar {
    width: 100%;
    height: clamp(7px, min(1.8vh, 1.3vw), 12px);
    background: rgba(255,255,255,0.06);
    border-radius: 5px;
    overflow: hidden;
    border: 1px solid rgba(255, 50, 80, 0.3);
}

.boss-health-fill {
    height: 100%;
    width: 100%;
    background: linear-gradient(90deg, #cc2244, var(--danger));
    box-shadow: 0 0 10px rgba(255, 50, 80, 0.5);
    border-radius: 4px;
    transition: width 0.3s ease;
}